I tried another USB device and it works. Could you provide some details? Crash dump or so?

Does 'arecord' work for you?

arecord works,

I was wrong alsa stays alive but after the upgrade to 1.2.3 pulseaudio is killed when usb card is inserted:

===========
--Jun 14 16:47:59 ja pulseaudio[2456]: W: [pulseaudio] module.c: module-combine is deprecated: Please use module-combine-sink instead of module-combine!
Jun 14 16:47:59 ja pulseaudio[2456]: W: [pulseaudio] module-combine.c: We will now load module-combine-sink. Please make sure to remove module-combine from your configuration.
Jun 14 16:47:59 ja pulseaudio[2456]: E: [pulseaudio] backend-ofono.c: Failed to register as a handsfree audio agent with ofono: org.freedesktop.DBus.Error.ServiceUnknown: The name is not activatable
Jun 14 16:48:38 ja pulseaudio[3556]: W: [pulseaudio] pid.c: Stale PID file, overwriting.
Jun 14 16:48:39 ja pulseaudio[3583]: W: [pulseaudio] pid.c: Stale PID file, overwriting.
Jun 14 16:48:40 ja pulseaudio[3607]: W: [pulseaudio] pid.c: Stale PID file, overwriting.
Jun 14 16:48:41 ja pulseaudio[3649]: W: [pulseaudio] pid.c: Stale PID file, overwriting.
Jun 14 16:48:42 ja pulseaudio[3672]: W: [pulseaudio] pid.c: Stale PID file, overwriting.

=============
Likely crash reason: Jump to an invalid address
Exploitable rating (0-9 scale): 6


=============
{   "signal": 11
,   "executable": "/usr/bin/pulseaudio"
,   "stacktrace":
      [ {   "crash_thread": true
        ,   "frames":
              [ {   "address": 140154788219916
                ,   "build_id": "7ca24d4dc3de9d62d9ad6bb25e5b70a3e57a342f"
                ,   "build_id_offset": 560140
                ,   "function_name": "malloc_consolidate"
                ,   "file_name": "/lib64/libc.so.6"
                }
              , {   "address": 140154788227829
                ,   "build_id": "7ca24d4dc3de9d62d9ad6bb25e5b70a3e57a342f"
                ,   "build_id_offset": 568053
                ,   "function_name": "_int_malloc"
                ,   "file_name": "/lib64/libc.so.6"
                }
              , {   "address": 140154788234857
                ,   "build_id": "7ca24d4dc3de9d62d9ad6bb25e5b70a3e57a342f"
                ,   "build_id_offset": 575081
                ,   "function_name": "malloc"
                ,   "file_name": "/lib64/libc.so.6"
                }
              , {   "address": 140154788143044
                ,   "build_id": "7ca24d4dc3de9d62d9ad6bb25e5b70a3e57a342f"
                ,   "build_id_offset": 483268
                ,   "function_name": "_IO_file_doallocate"
                ,   "file_name": "/lib64/libc.so.6"
                }
              , {   "address": 140154788203808
                ,   "build_id": "7ca24d4dc3de9d62d9ad6bb25e5b70a3e57a342f"
                ,   "build_id_offset": 544032
                ,   "function_name": "_IO_doallocbuf"
                ,   "file_name": "/lib64/libc.so.6"
                }
              , {   "address": 140154788199516
                ,   "build_id": "7ca24d4dc3de9d62d9ad6bb25e5b70a3e57a342f"
                ,   "build_id_offset": 539740
                ,   "function_name": "_IO_file_underflow@@GLIBC_2.2.5"
                ,   "file_name": "/lib64/libc.so.6"
                }
              , {   "address": 140154788203990
                ,   "build_id": "7ca24d4dc3de9d62d9ad6bb25e5b70a3e57a342f"
                ,   "build_id_offset": 544214
                ,   "function_name": "_IO_default_uflow"
                ,   "file_name": "/lib64/libc.so.6"
                }
              , {   "address": 140154788180040
                ,   "build_id": "7ca24d4dc3de9d62d9ad6bb25e5b70a3e57a342f"
                ,   "build_id_offset": 520264
                ,   "function_name": "_IO_getc"
                ,   "file_name": "/lib64/libc.so.6"
                }
              , {   "address": 140154491696981
                ,   "build_id": "00c798c69871e22f8defc1f06304108a3ec7ac9c"
                ,   "build_id_offset": 210773
                ,   "function_name": "get_char.part.0"
                ,   "file_name": "/lib64/libasound.so.2"
                }
              , {   "address": 140154491698365
                ,   "build_id": "00c798c69871e22f8defc1f06304108a3ec7ac9c"
                ,   "build_id_offset": 212157
                ,   "function_name": "get_char_skip_comments"
                ,   "file_name": "/lib64/libasound.so.2"
                }
              , {   "address": 140154491708840
                ,   "build_id": "00c798c69871e22f8defc1f06304108a3ec7ac9c"
                ,   "build_id_offset": 222632
                ,   "function_name": "parse_defs"
                ,   "file_name": "/lib64/libasound.so.2"
                }
              , {   "address": 140154491710522
                ,   "build_id": "00c798c69871e22f8defc1f06304108a3ec7ac9c"
                ,   "build_id_offset": 224314
                ,   "function_name": "_snd_config_load_with_include"
                ,   "file_name": "/lib64/libasound.so.2"
                }
              , {   "address": 140154491723759
                ,   "build_id": "00c798c69871e22f8defc1f06304108a3ec7ac9c"
                ,   "build_id_offset": 237551
                ,   "function_name": "snd_config_update_r"
                ,   "file_name": "/lib64/libasound.so.2"
                }
              , {   "address": 140154491725438
                ,   "build_id": "00c798c69871e22f8defc1f06304108a3ec7ac9c"
                ,   "build_id_offset": 239230
                ,   "function_name": "snd_config_update_ref"
                ,   "file_name": "/lib64/libasound.so.2"
                }
              , {   "address": 140154491769338
                ,   "build_id": "00c798c69871e22f8defc1f06304108a3ec7ac9c"
                ,   "build_id_offset": 283130
                ,   "function_name": "snd_ctl_open"
                ,   "file_name": "/lib64/libasound.so.2"
                }
              , {   "address": 140154492225216
                ,   "build_id": "00c798c69871e22f8defc1f06304108a3ec7ac9c"
                ,   "build_id_offset": 739008
                ,   "function_name": "uc_mgr_open_ctl"
                ,   "file_name": "/lib64/libasound.so.2"
                }
              , {   "address": 140154492229847
                ,   "build_id": "00c798c69871e22f8defc1f06304108a3ec7ac9c"
                ,   "build_id_offset": 743639
                ,   "function_name": "get_by_card"
                ,   "file_name": "/lib64/libasound.so.2"
                }
              , {   "address": 140154492244307
                ,   "build_id": "00c798c69871e22f8defc1f06304108a3ec7ac9c"
                ,   "build_id_offset": 758099
                ,   "function_name": "uc_mgr_import_master_config"
                ,   "file_name": "/lib64/libasound.so.2"
                }
              , {   "address": 140154492263700
                ,   "build_id": "00c798c69871e22f8defc1f06304108a3ec7ac9c"
                ,   "build_id_offset": 777492
                ,   "function_name": "snd_use_case_mgr_open"
                ,   "file_name": "/lib64/libasound.so.2"
                }
              , {   "address": 140154492970095
                ,   "build_id": "165fe6adc8d146daf9753fd0e38e303fe8dbf642"
                ,   "build_id_offset": 115823
                ,   "function_name": "pa_alsa_ucm_query_profiles"
                ,   "file_name": "/usr/lib64/pulse-13.99/modules/libalsa-util.so"
                }
              , {   "address": 140154493653876
                ,   "build_id": "042595d9966ca3c622d5745f3387cc23f3b4008b"
                ,   "build_id_offset": 21364
                ,   "function_name": "module_alsa_card_LTX_pa__init"
                ,   "file_name": "/usr/lib64/pulse-13.99/modules/module-alsa-card.so"
                }
              , {   "address": 140154792318353
                ,   "build_id": "129bba7224a6ce536403e4ea27e4248398a2a929"
                ,   "build_id_offset": 210321
                ,   "function_name": "pa_module_load"
                ,   "file_name": "/usr/lib64/pulseaudio/libpulsecore-13.99.so"
                }
              , {   "address": 140154493691043
                ,   "build_id": "2223d26e1b488918bea419eb3c7df41a5d50e200"
                ,   "build_id_offset": 13475
                ,   "function_name": "verify_access"
                ,   "file_name": "/usr/lib64/pulse-13.99/modules/module-udev-detect.so"
                }
              , {   "address": 140154493695203
                ,   "build_id": "2223d26e1b488918bea419eb3c7df41a5d50e200"
                ,   "build_id_offset": 17635
                ,   "function_name": "module_udev_detect_LTX_pa__init"
                ,   "file_name": "/usr/lib64/pulse-13.99/modules/module-udev-detect.so"
                }
              , {   "address": 140154792318353
                ,   "build_id": "129bba7224a6ce536403e4ea27e4248398a2a929"
                ,   "build_id_offset": 210321
                ,   "function_name": "pa_module_load"
                ,   "file_name": "/usr/lib64/pulseaudio/libpulsecore-13.99.so"
                }
              , {   "address": 140154792235812
                ,   "build_id": "129bba7224a6ce536403e4ea27e4248398a2a929"
                ,   "build_id_offset": 127780
                ,   "function_name": "pa_cli_command_load"
                ,   "file_name": "/usr/lib64/pulseaudio/libpulsecore-13.99.so"
                }
              , {   "address": 140154792268602
                ,   "build_id": "129bba7224a6ce536403e4ea27e4248398a2a929"
                ,   "build_id_offset": 160570
                ,   "function_name": "pa_cli_command_execute_line_stateful"
                ,   "file_name": "/usr/lib64/pulseaudio/libpulsecore-13.99.so"
                }
              , {   "address": 140154792270585
                ,   "build_id": "129bba7224a6ce536403e4ea27e4248398a2a929"
                ,   "build_id_offset": 162553
                ,   "function_name": "pa_cli_command_execute_file_stream"
                ,   "file_name": "/usr/lib64/pulseaudio/libpulsecore-13.99.so"
                }
              , {   "address": 94921120440868
                ,   "build_id": "5e31c73bc70cd3a791b5cd94ddcd936dad387c1c"
                ,   "build_id_offset": 33316
                ,   "function_name": "main"
                ,   "file_name": "/usr/bin/pulseaudio"
                } ]
        }
      , {   "frames":
              [ {   "address": 140154788670574
                ,   "build_id": "7ca24d4dc3de9d62d9ad6bb25e5b70a3e57a342f"
                ,   "build_id_offset": 1010798
                ,   "function_name": "ppoll"
                ,   "file_name": "/lib64/libc.so.6"
                }
              , {   "address": 140154792358660
                ,   "build_id": "129bba7224a6ce536403e4ea27e4248398a2a929"
                ,   "build_id_offset": 250628
                ,   "function_name": "pa_rtpoll_run"
                ,   "file_name": "/usr/lib64/pulseaudio/libpulsecore-13.99.so"
                }
              , {   "address": 140154493081877
                ,   "build_id": "165fe6adc8d146daf9753fd0e38e303fe8dbf642"
                ,   "build_id_offset": 227605
                ,   "function_name": "thread_func"
                ,   "file_name": "/usr/lib64/pulse-13.99/modules/libalsa-util.so"
                }
              , {   "address": 140154791261612
                ,   "build_id": "2e8378741b12cafcac353ce407700d13f7eaa6a1"
                ,   "build_id_offset": 365996
                ,   "function_name": "internal_thread_func"
                ,   "file_name": "/usr/lib64/pulseaudio/libpulsecommon-13.99.so"
                }
              , {   "address": 140154789602354
                ,   "build_id": "d75253191e7d61f6945c8268759ab2afbabf2bc1"
                ,   "build_id_offset": 37938
                ,   "function_name": "start_thread"
                ,   "file_name": "/lib64/libpthread.so.0"
                }
              , {   "address": 140154788714963
                ,   "build_id": "7ca24d4dc3de9d62d9ad6bb25e5b70a3e57a342f"
                ,   "build_id_offset": 1055187
                ,   "function_name": "__clone"
                ,   "file_name": "/lib64/libc.so.6"
                } ]
        }
      , {   "frames":
              [ {   "address": 140154788670574
                ,   "build_id": "7ca24d4dc3de9d62d9ad6bb25e5b70a3e57a342f"
                ,   "build_id_offset": 1010798
                ,   "function_name": "ppoll"
                ,   "file_name": "/lib64/libc.so.6"
                }
              , {   "address": 140154792358660
                ,   "build_id": "129bba7224a6ce536403e4ea27e4248398a2a929"
                ,   "build_id_offset": 250628
                ,   "function_name": "pa_rtpoll_run"
                ,   "file_name": "/usr/lib64/pulseaudio/libpulsecore-13.99.so"
                }
              , {   "address": 140154493053773
                ,   "build_id": "165fe6adc8d146daf9753fd0e38e303fe8dbf642"
                ,   "build_id_offset": 199501
                ,   "function_name": "thread_func"
                ,   "file_name": "/usr/lib64/pulse-13.99/modules/libalsa-util.so"
                }
              , {   "address": 140154791261612
                ,   "build_id": "2e8378741b12cafcac353ce407700d13f7eaa6a1"
                ,   "build_id_offset": 365996
                ,   "function_name": "internal_thread_func"
                ,   "file_name": "/usr/lib64/pulseaudio/libpulsecommon-13.99.so"
                }
              , {   "address": 140154789602354
                ,   "build_id": "d75253191e7d61f6945c8268759ab2afbabf2bc1"
                ,   "build_id_offset": 37938
                ,   "function_name": "start_thread"
                ,   "file_name": "/lib64/libpthread.so.0"
                }
              , {   "address": 140154788714963
                ,   "build_id": "7ca24d4dc3de9d62d9ad6bb25e5b70a3e57a342f"
                ,   "build_id_offset": 1055187
                ,   "function_name": "__clone"
                ,   "file_name": "/lib64/libc.so.6"
                } ]
        } ]
}

Ok, the crash is in the UCM routines - around uc_mgr_open_ctl() function.

If you install alsa-ucm-utils and run command 'alsaucm -c hw:X set _verb HiFi', do you see this crash, too? (replace X with the USB card number - list can be obtained using 'arecord -l')

This is really strange issue. I cannot reproduce this here (running PA under valgrind on fresh F32 install):

  D: [memcheck-amd64-] module-udev-detect.c: /dev/snd/controlC1 is accessible: yes
  D: [memcheck-amd64-] module-udev-detect.c: /devices/pci0000:00/0000:00:14.0/usb1/1-2/1-2:1.0/sound/card1 is busy: no
  D: [memcheck-amd64-] module-udev-detect.c: Loading module-alsa-card with arguments 'device_id="1" name="usb-1130_USB_AUDIO-00" card_name="alsa_card.usb-1130_USB_AUDIO-00" namereg_fail=false tsched=yes fixed_latency_range=no   ignore_dB=no deferred_volume=yes use_ucm=yes avoid_resampling=no card_properties="module-udev-detect.discovered=1"'
  D: [memcheck-amd64-] reserve-wrap.c: Unable to contact D-Bus session bus: org.freedesktop.DBus.Error.NotSupported: Unable to autolaunch a dbus-daemon without a $DISPLAY for X11
  I: [memcheck-amd64-] (alsa-lib)main.c: error: failed to import hw:1 use case configuration -2
  I: [memcheck-amd64-] (alsa-lib)main.c: error: failed to import USB  AUDIO use case configuration -2
  I: [memcheck-amd64-] alsa-ucm.c: UCM not available for card USB  AUDIO


Steps to debug things:

  # dnf debuginfo-install alsa-lib pulseaudio --enablerepo=updates-testing,updates-testing-modular --best
  # mv /usr/bin/pulseaudio /usr/bin/pulseaudio1  # or disable respawn in the global file, I prefer rename, rename it back when finished
  # killall -9 pulseaudio
  $ valgrind -v --leak-check=yes pulseaudio1 -vvvvvvvvvvvvvvvvvvvvvvvv # run as user, not root!

My packages:

  pulseaudio-13.99.1-3.fc32.x86_64
  alsa-lib-1.2.3-8.fc32.x86_64
  alsa-ucm-1.2.3-8.fc32.noarch

It's an USB soundard with input and output. But there should not be a big difference.

$arecord -l
**** List of CAPTURE Hardware Devices ****
card 0: PCH [HDA Intel PCH], device 0: ALC269VC Analog [ALC269VC Analog]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 2: Device [USB PnP Sound Device], device 0: USB Audio [USB Audio]
  Subdevices: 1/1
  Subdevice #0: subdevice #0

$ sudo alsaucm -c hw:2 set _verb HiFi
ALSA lib main.c:983:(snd_use_case_mgr_open) error: failed to import hw:2 use case configuration -2
alsaucm: error failed to open sound card hw:2: No such file or directory

 # dnf debuginfo-install alsa-lib pulseaudio --enablerepo=updates-testing,updates-testing-modular --best  
 # mv /usr/bin/pulseaudio /usr/bin/pulseaudio1  # or disable respawn in the global file, I prefer rename, rename it back when finished
 # killall -9 pulseaudio

valgrind -v --leak-check=yes pulseaudio1 -vvvvvvvvvvvvvvvvvvvvvvvv # NO CRASH

pulseaudio-13.99.1-3.fc32.x86_64
alsa-lib-1.2.3-8.fc32.x86_64
alsa-lib-1.2.3-8.fc32.i686
alsa-ucm-1.2.3-8.fc32.noarch

pulseaudio1 # CRASH

funny, some timing problem?

[ 2218.624566] hid-generic 0003:0D8C:013C.0009: input,hidraw0: USB HID v1.00 Device [C-Media Electronics Inc.       USB PnP Sound Device] on usb-0000:00:14.0-1/input3
[ 2219.314470] pulseaudio1[7642]: segfault at 9 ip 00007f6783f46c0c sp 00007ffd1504be90 error 4 in libc-2.31.so[7f6783ee3000+150000]
[ 2219.314478] Code: 43 28 00 00 00 00 48 8b 54 24 08 48 89 ef 48 89 43 10 48 83 cf 01 48 89 7b 08 48 89 53 18 48 89 2c 2b 48 85 c9 74 87 48 89 cb <48> 8b 43 08 89 c1 c1 e9 04 83 e9 02 49 8d 4c cc 10 49 39 cd 0f 85

Yes, it appears like a memory corruption bug somewhere.

Could you try gdb ?

  $ gdb --args pulseaudio1
  (gdb) run
  ... if you hit crash ..
  (gdb) set logging on
  (gdb) set pagination off
  (gdb) bt full

Note: "set logging on" will cause GDB to write its output to a file, by default this will be gdb.txt in the current directory.

#0  0x00007ffff7b59c0c in malloc_consolidate () at /lib64/libc.so.6
#1  0x00007ffff7b5baf5 in _int_malloc () at /lib64/libc.so.6
#2  0x00007ffff7b5d669 in malloc () at /lib64/libc.so.6
#3  0x00007ffff7b46fc4 in _IO_file_doallocate () at /lib64/libc.so.6
#4  0x00007ffff7b55d20 in _IO_doallocbuf () at /lib64/libc.so.6
#5  0x00007ffff7b54c5c in __GI__IO_file_underflow () at /lib64/libc.so.6
#6  0x00007ffff7b55dd6 in _IO_default_uflow () at /lib64/libc.so.6
#7  0x00007ffff7b50048 in getc () at /lib64/libc.so.6
#8  0x00007fffe6090755 in get_char (input=input@entry=0x7fffffffc530) at conf.c:741
        c = <optimized out>
        fd = 0x5555555f78a0
#9  0x00007fffe6090cbd in get_char (input=0x7fffffffc530) at conf.c:779
        c = <optimized out>
        __func__ = "get_char_skip_comments"
#10 get_char_skip_comments (input=input@entry=0x7fffffffc530) at conf.c:779
        c = <optimized out>
        __func__ = "get_char_skip_comments"
#11 0x00007fffe60935a8 in get_nonwhite (input=<optimized out>) at conf.c:864
        c = <optimized out>
        c = <optimized out>
        err = <optimized out>
#12 parse_defs (parent=parent@entry=0x55555573e5f0, input=input@entry=0x7fffffffc530, skip=skip@entry=0, override=override@entry=0) at conf.c:1496
        c = <optimized out>
        err = <optimized out>
#13 0x00007fffe6093c3a in _snd_config_load_with_include (config=0x55555573e5f0, in=<optimized out>, override=override@entry=0, include_paths=include_paths@entry=0x0) at conf.c:1943
        err = <optimized out>
        input = {current = 0x5555555f78a0, unget = 0, ch = 32767}
        fd = 0x5555555f78a0
        fd_next = <optimized out>
        __PRETTY_FUNCTION__ = "_snd_config_load_with_include"
        __func__ = "_snd_config_load_with_include"
#14 0x00007fffe6093f0d in snd_config_load (config=<optimized out>, in=<optimized out>) at conf.c:2010
#15 0x00007fffe6096fef in snd_config_update_r (_top=_top@entry=0x7fffe615f108 <snd_config>, _update=_update@entry=0x7fffe615f118 <snd_config_global_update>, cfgs=cfgs@entry=0x0) at conf.c:4188
        in = 0x5555557a7c20
        err = <optimized out>
        configs = <optimized out>
        c = <optimized out>
        k = 0
        l = <optimized out>
        local = <optimized out>
        update = 0x0
        top = 0x55555573e5f0
        __PRETTY_FUNCTION__ = "snd_config_update_r"
        __func__ = "snd_config_update_r"
#16 0x00007fffe609767e in snd_config_update_ref (top=top@entry=0x7fffffffc6f0) at conf.c:4255
        err = <optimized out>
#17 0x00007fffe60a21fa in snd_ctl_open (ctlp=ctlp@entry=0x7fffffffc8e8, name=name@entry=0x5555555d9650 "hw:2", mode=mode@entry=0) at control.c:1400
        top = 0x0
        err = <optimized out>
        __PRETTY_FUNCTION__ = "snd_ctl_open"
#18 0x00007fffe61116c0 in uc_mgr_open_ctl (uc_mgr=uc_mgr@entry=0x5555556605c0, ctll=ctll@entry=0x7fffffffc940, device=device@entry=0x5555555d9650 "hw:2", slave=slave@entry=0) at utils.c:266
        pos1 = 0x555555660690
        pos2 = <optimized out>
        ctl = 0x7ffff7b5c2e0 <_int_malloc+2544>
        ctl_list = 0x64
        ctl_dev = <optimized out>
        info = 0x7fffffffc730
        id = <optimized out>
        err = <optimized out>
        card = <optimized out>
        __func__ = "uc_mgr_open_ctl"
#19 0x00007fffe61128d7 in get_card_info (info=<synthetic pointer>, ctl_name=0x5555555d9650 "hw:2", mgr=0x5555556605c0) at parser.c:1970
        ctl_list = 0x3400000010
        err = <optimized out>
        info = <optimized out>
        err = <optimized out>
#20 get_by_card (mgr=mgr@entry=0x5555556605c0, ctl_name=ctl_name@entry=0x5555555d9650 "hw:2") at parser.c:1970
        info = <optimized out>
        err = <optimized out>
#21 0x00007fffe6116153 in uc_mgr_import_master_config (uc_mgr=uc_mgr@entry=0x5555556605c0) at parser.c:2196
        cfg = 0x11810
        name = 0x5555555d9650 "hw:2"
        err = <optimized out>
        __func__ = "uc_mgr_import_master_config"
#22 0x00007fffe611ad14 in import_master_config (uc_mgr=0x5555556605c0) at main.c:981
        err = <optimized out>
        mgr = 0x5555556605c0
        err = <optimized out>
        __func__ = "snd_use_case_mgr_open"
#23 snd_use_case_mgr_open (uc_mgr=uc_mgr@entry=0x5555555f74f8, card_name=0x5555556446c0 "hw:2") at main.c:981
        mgr = 0x5555556605c0
        err = <optimized out>
        __func__ = "snd_use_case_mgr_open"
#24 0x00007fffe61c746f in pa_alsa_ucm_query_profiles (ucm=ucm@entry=0x5555555f74f0, card_index=2) at modules/alsa/alsa-ucm.c:732
        card_name = 0x5555556446c0 "hw:2"
        verb_list = 0x7fffe615f020 <pcm_dlobj_list>
        num_verbs = <optimized out>
        i = <optimized out>
        err = 0
        __func__ = "pa_alsa_ucm_query_profiles"
        __PRETTY_FUNCTION__ = "pa_alsa_ucm_query_profiles"
#25 0x00007fffe626e374 in module_alsa_card_LTX_pa__init (m=0x5555555f37d0) at modules/alsa/module-alsa-card.c:844
        data = {name = 0x5555556446c0 "hw:2", proplist = 0xa20b42920ab84100, driver = 0x555555575260 "\001", module = 0x7fffffffcbf8, profiles = 0x5555555ab5c0, ports = 0x7ffff7e1b540 <entries_flist_init>, preferred_input_port = 0x7ffff7e6d148, preferred_output_port = 0x7ffff7e2a18f <pa_run_once+31>, namereg_fail = false}
        ignore_dB = false
        u = 0x5555555f74a0
        reserve = 0x5555555f76f0
        description = <optimized out>
        profile_str = 0x0
        fn = 0x0
        namereg_fail = false
        __func__ = "module_alsa_card_LTX_pa__init"
        __PRETTY_FUNCTION__ = "module_alsa_card_LTX_pa__init"
#26 0x00007ffff7f42591 in pa_module_load (module=module@entry=0x7fffffffcbf8, c=0x555555575260, name=name@entry=0x7fffe627913d "module-alsa-card", argument=0x555555574f90 "device_id=\"2\" name=\"usb-C-Media_Electronics_Inc._USB_PnP_Sound_Device-00\" card_name=\"alsa_card.usb-C-Media_Electronics_Inc._USB_PnP_Sound_Device-00\" namereg_fail=false tsched=yes fixed_latency_range=n"...) at pulsecore/module.c:191
        m = 0x5555555f37d0
        load_once = <optimized out>
        get_deprecated = <optimized out>
        mi = <optimized out>
        errcode = <optimized out>
        __func__ = "pa_module_load"
        __PRETTY_FUNCTION__ = "pa_module_load"
#27 0x00007fffe62774a3 in verify_access (u=0x5555555abea0, d=0x5555555f3760) at modules/module-udev-detect.c:336
        m = 0x555555670480
        busy = <optimized out>
        cd = <optimized out>
        card = <optimized out>
        accessible = <optimized out>
        __func__ = "verify_access"
        __PRETTY_FUNCTION__ = "verify_access"
#28 0x00007fffe6277b85 in monitor_cb (a=0x555555573258, e=<optimized out>, fd=<optimized out>, events=<optimized out>, userdata=0x5555555abea0) at modules/module-udev-detect.c:512
        u = 0x5555555abea0
        dev = 0x555555644930
        __func__ = "monitor_cb"
        __PRETTY_FUNCTION__ = "monitor_cb"
#29 0x00007ffff7e95cd3 in pa_mainloop_dispatch () at /lib64/libpulse.so.0
#30 0x00007ffff7e96002 in pa_mainloop_iterate () at /lib64/libpulse.so.0
#31 0x00007ffff7e960a0 in pa_mainloop_run () at /lib64/libpulse.so.0
#32 0x000055555555c3af in main (argc=<optimized out>, argv=<optimized out>) at daemon/main.c:1167
        c = 0x555555575260
        buf = <optimized out>
        conf = 0x5555555705b0
        mainloop = 0x555555573200
        s = <optimized out>
        configured_address = <optimized out>
        r = <optimized out>
        retval = 0
        d = 1
        valid_pid_file = true
        ltdl_init = true
        n_fds = <optimized out>
        passed_fds = <optimized out>
        e = <optimized out>
        daemon_pipe = {-1, -1}
        daemon_pipe2 = {-1, -1}
        autospawn_fd = -1
        autospawn_locked = false
        server_lookup = <optimized out>
        lookup_service_bus = <optimized out>
        server_bus = <optimized out>
        start_server = <optimized out>
        __func__ = "main"
        __PRETTY_FUNCTION__ = "main"

It's not a straight info to localize the crash cause.

Do you have any special ~/.asoundrc or /etc/asound.conf or /etc/alsa/conf.d config ?

no ~/.asoundrc file

==============
$cat /etc/asound.conf
#
# Place your global alsa-lib configuration here...
#

==============
$ls /etc/alsa/
alsactl.conf  conf.d  state-daemon.conf



==============
$cat /etc/alsa/alsactl.conf 
#
# ALSA library configuration file for alsactl tool
# (/usr/share/alsa tree is not necessary for alsactl)
#

ctl.hw {
        @args [ CARD ]
        @args.CARD {
                type string
                default "0"
        }
        type hw
        card $CARD
}


==============
$cat /etc/alsa/state-daemon.conf 
# Remove this file to disable the alsactl daemon mode


===============
$ls /etc/alsa/conf.d/
10-rate-lav.conf  50-pulseaudio.conf  60-a52-encoder.conf  99-pulseaudio-default.conf

=============
$cat /etc/alsa/conf.d/10-rate-lav.conf 
pcm.lavrate {
        @args [ SLAVE RATE CONVERTER ]
        @args.SLAVE {
                type string
                default "plug:hw"
        }
        @args.RATE {
                type integer
                default 48000
        }
        @args.CONVERTER {
                type string
                default "lavrate"
        }
        type rate
        converter $CONVERTER
        slave {
                pcm $SLAVE
                rate $RATE
        }
        hint {
                show {
                        @func refer
                        name defaults.namehint.basic
                }
                description "Rate Converter Plugin Using Libav/FFmpeg Library"
        }
}

================
$
 cat /etc/alsa/conf.d/50-pulseaudio.conf 
# Add a specific named PulseAudio pcm and ctl (typically useful for testing)

pcm.pulse {
        @args [ DEVICE ]
        @args.DEVICE {
                type string
                default ""
        }
        type pulse
        device $DEVICE
        hint {
                show {
                        @func refer
                        name defaults.namehint.basic
                }
                description "PulseAudio Sound Server"
        }
}

ctl.pulse {
        @args [ DEVICE ]
        @args.DEVICE {
                type string
                default ""
        }
        type pulse
        device $DEVICE
}

======================= 
$cat /etc/alsa/conf.d/60-a52-encoder.conf 
pcm.a52 {
        @args [ CARD SLAVE RATE BITRATE CHANNELS ]
        @args.CARD {
                type integer
                default {
                        @func refer
                        name defaults.pcm.card
                }
        }
        @args.SLAVE {
                type string
        }
        @args.RATE {
                type integer
                default 48000
        }
        @args.BITRATE {
                type integer
                default 448
        }
        @args.CHANNELS {
                type string
                default 6
        }
        type a52
        card $CARD
        slavepcm $SLAVE
        rate $RATE
        bitrate $BITRATE
        channels $CHANNELS
        hint {
                show {
                        @func refer
                        name defaults.namehint.basic
                }
                description "Plugin to convert multichannel stream to A52 (AC3) bitstream"
        }
}

============================
$cat /etc/alsa/conf.d/99-pulseaudio-default.conf 
# Default to PulseAudio

pcm.!default {
    type pulse
    hint {
        show on
        description "Default ALSA Output (currently PulseAudio Sound Server)"
    }
}

ctl.!default {
    type pulse
}

Upstream fix: https://github.com/alsa-project/alsa-lib/commit/20e003a63d14edabd59e40e5d0b8ed2f11f8c9b8

*** Bug 1847508 has been marked as a duplicate of this bug. ***

Sorry, i tried your commit, but it doesn't fix my original reported problem from https://bugzilla.redhat.com/show_bug.cgi?id=1847508

"No sound with Creative Soundblaster Z since update to alsa-lib-1.2.3-8"

I don't use pulseaudio, because pulseaudio doesn't support more than a 2.0 channel setup with my card, and my card is a middle-highend PCIe card and an usb one.

So, my report wasn't about crashing pulsaudio, sadly another user hijacked my report!!

Why did you close https://bugzilla.redhat.com/show_bug.cgi?id=1847508 ?

I am happy to give more information to debug, but please ask me.

FEDORA-2020-f38d4b2eab has been submitted as an update to Fedora 32. https://bodhi.fedoraproject.org/updates/FEDORA-2020-f38d4b2eab

I just ran into this problem too.
If my webcam is plugged in, I get no audio.
Gnome settings shows only a dummy audio device.

I ran `dnf downgrade alsa-lib* alsa-utils* alsa-ucm* alsa-topology*` which downgraded them all from 1.2.3-3 back to 1.2.2-2 or 1.2.2-1.
After that I once again have audio. I can plug in my webcam, and speakers and microphone work.

FEDORA-2020-f38d4b2eab has been pushed to the Fedora 32 testing repository.
In short time you'll be able to install the update with the following command:
`sudo dnf upgrade --enablerepo=updates-testing --advisory=FEDORA-2020-f38d4b2eab`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2020-f38d4b2eab

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.

*** Bug 1849412 has been marked as a duplicate of this bug. ***

*** Bug 1849389 has been marked as a duplicate of this bug. ***

FEDORA-2020-f38d4b2eab has been pushed to the Fedora 32 stable repository.
If problem still persists, please make note of it in this bug report.

*** Bug 1849415 has been marked as a duplicate of this bug. ***