Noticed sys-audio shut down unexpectedly, here is the kernel panic I found in the console log. Has only happened once so far.
sys-audio based on debian-13-xfce template, PVH with one usb audio DAC persistent attached (a Fiio K3)
[26843.353682] BUG: kernel NULL pointer dereference, address: 0000000000000050
[26843.353713] #PF: supervisor read access in kernel mode
[26843.353736] #PF: error_code(0x0000) - not-present page
[26843.353759] PGD 0 P4D 0
[26843.353776] Oops: Oops: 0000 [#1] SMP NOPTI
[26843.353796] CPU: 0 UID: 1000 PID: 772 Comm: pipewire Not tainted 6.18.40-1.qubes.fc41.x86_64 #1 PREEMPT(full)
[26843.353838] RIP: 0010:vhci_urb_dequeue+0x5b/0x290 [vhci_hcd]
[26843.353871] Code: 08 48 89 04 24 4d 85 e4 0f 84 0f 02 00 00 89 ea 4c 89 f6 48 89 df e8 44 0e d7 c0 89 c5 85 c0 0f 85 cf 01 00 00 4d 8b 7c 24 18 <49> 83 7f 50 00 0f 84 2a 01 00 00 4d 8d b7 a0 00 00 00 4c 89 f7 e8
[26843.353938] RSP: 0018:ffffc900011579c8 EFLAGS: 00010046
[26843.353962] RAX: 0000000000000000 RBX: ffff88800eda3000 RCX: ffff888008b2eaa0
[26843.353994] RDX: 00000000ffffff98 RSI: ffff888011c5e200 RDI: ffff888011c5e218
[26843.354025] RBP: 0000000000000000 R08: 0000000000000000 R09: ffff888003f15e40
[26843.354057] R10: ffffc900011579c8 R11: 0000000000000038 R12: ffff8880175122c0
[26843.354088] R13: ffff8880065587a0 R14: ffff888011c5e200 R15: 0000000000000000
[26843.354124] FS: 00007592e8534740(0000) GS:ffff8880f7764000(0000) knlGS:0000000000000000
[26843.354156] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[26843.354183] CR2: 0000000000000050 CR3: 0000000017763000 CR4: 0000000000750ef0
[26843.354220] PKRU: 55555554
[26843.354234] Call Trace:
[26843.354249] <TASK>
[26843.354266] usb_hcd_unlink_urb+0x7a/0xd0
[26843.354290] stop_urbs+0xcc/0x100 [snd_usb_audio]
[26843.354332] snd_usb_endpoint_stop+0x97/0xe0 [snd_usb_audio]
[26843.354379] snd_usb_substream_playback_trigger+0x1f0/0x210 [snd_usb_audio]
[26843.354427] snd_pcm_do_stop+0x4a/0x70 [snd_pcm]
[26843.354459] snd_pcm_action_single+0x36/0x80 [snd_pcm]
[26843.354489] snd_pcm_drop+0x62/0xe0 [snd_pcm]
[26843.354520] snd_pcm_ioctl+0x2b/0x40 [snd_pcm]
[26843.354554] __x64_sys_ioctl+0x96/0xe0
[26843.354575] ? syscall_trace_enter+0x95/0x1a0
[26843.354601] do_syscall_64+0x87/0x7e0
[26843.354622] ? srso_alias_return_thunk+0x5/0xfbef5
[26843.354647] ? __rseq_handle_notify_resume+0xb1/0x1b0
[26843.354705] ? srso_alias_return_thunk+0x5/0xfbef5
[26843.354730] ? arch_exit_to_user_mode_prepare.isra.0+0x9d/0xc0
[26843.354759] ? srso_alias_return_thunk+0x5/0xfbef5
[26843.354784] ? do_syscall_64+0xbe/0x7e0
[26843.354804] ? srso_alias_return_thunk+0x5/0xfbef5
[26843.354828] ? vfs_write+0xcf/0x450
[26843.354849] ? srso_alias_return_thunk+0x5/0xfbef5
[26843.354873] ? __seccomp_filter+0x50/0x360
[26843.354896] ? srso_alias_return_thunk+0x5/0xfbef5
[26843.354920] ? ksys_write+0xcb/0xe0
[26843.354942] ? srso_alias_return_thunk+0x5/0xfbef5
[26843.354966] ? do_syscall_64+0xbe/0x7e0
[26843.354985] ? srso_alias_return_thunk+0x5/0xfbef5
[26843.355010] ? do_syscall_64+0xbe/0x7e0
[26843.355032] ? srso_alias_return_thunk+0x5/0xfbef5
[26843.355056] ? __sys_recvmsg+0xc9/0xe0
[26843.355078] ? srso_alias_return_thunk+0x5/0xfbef5
[26843.355102] ? sock_poll+0x54/0xe0
[26843.355123] ? srso_alias_return_thunk+0x5/0xfbef5
[26843.355147] ? ep_item_poll.isra.0+0x53/0x90
[26843.355173] ? srso_alias_return_thunk+0x5/0xfbef5
[26843.355197] ? do_epoll_ctl+0x28c/0x810
[26843.355220] ? srso_alias_return_thunk+0x5/0xfbef5
[26843.355244] ? __x64_sys_epoll_ctl+0x72/0xa0
[26843.355269] ? srso_alias_return_thunk+0x5/0xfbef5
[26843.355293] ? do_syscall_64+0xbe/0x7e0
[26843.355315] ? srso_alias_return_thunk+0x5/0xfbef5
[26843.355339] ? do_syscall_64+0xbe/0x7e0
[26843.355359] ? srso_alias_return_thunk+0x5/0xfbef5
[26843.355383] ? do_syscall_64+0xbe/0x7e0
[26843.355402] ? __irq_exit_rcu+0x4c/0xe0
[26843.355424] entry_SYSCALL_64_after_hwframe+0x76/0x7e
[26843.355448] RIP: 0033:0x7592e864391b
[26843.355468] Code: 00 48 89 44 24 18 31 c0 48 8d 44 24 60 c7 04 24 10 00 00 00 48 89 44 24 08 48 8d 44 24 20 48 89 44 24 10 b8 10 00 00 00 0f 05 <89> c2 3d 00 f0 ff ff 77 1c 48 8b 44 24 18 64 48 2b 04 25 28 00 00
[26843.355535] RSP: 002b:00007fff63f0c000 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[26843.355569] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007592e864391b
[26843.355600] RDX: 0000000000000000 RSI: 0000000000004143 RDI: 0000000000000038
[26843.355631] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
[26843.355667] R10: 0000000000000000 R11: 0000000000000246 R12: 0000582310158380
[26843.355698] R13: 000058230ff81b10 R14: 00007592e7f96fe0 R15: 00005822e01b5028
[26843.355734] </TASK>
[26843.355748] Modules linked in: snd_usb_audio snd_usbmidi_lib snd_hwdep mc snd_ump snd_rawmidi vhci_hcd usbip_core snd_seq_dummy snd_hrtimer snd_seq snd_seq_device vfat fat nft_reject_ipv6 nf_reject_ipv6 nft_reject_ipv4 nf_reject_ipv4 nft_reject nft_ct nft_masq xenfs nft_chain_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 nf_tables binfmt_misc intel_rapl_msr snd_pcm snd_timer intel_rapl_common snd soundcore polyval_clmulni ghash_clmulni_intel pcspkr xen_privcmd xen_gntdev xen_gntalloc xen_blkback xen_evtchn parport_pc ppdev lp parport fuse nfnetlink ip_tables overlay xen_blkfront
[26843.355980] CR2: 0000000000000050
[26843.355998] ---[ end trace 0000000000000000 ]---
[26843.356020] RIP: 0010:vhci_urb_dequeue+0x5b/0x290 [vhci_hcd]
[26843.356052] Code: 08 48 89 04 24 4d 85 e4 0f 84 0f 02 00 00 89 ea 4c 89 f6 48 89 df e8 44 0e d7 c0 89 c5 85 c0 0f 85 cf 01 00 00 4d 8b 7c 24 18 <49> 83 7f 50 00 0f 84 2a 01 00 00 4d 8d b7 a0 00 00 00 4c 89 f7 e8
[26843.356118] RSP: 0018:ffffc900011579c8 EFLAGS: 00010046
[26843.356142] RAX: 0000000000000000 RBX: ffff88800eda3000 RCX: ffff888008b2eaa0
[26843.356179] RDX: 00000000ffffff98 RSI: ffff888011c5e200 RDI: ffff888011c5e218
[26843.356211] RBP: 0000000000000000 R08: 0000000000000000 R09: ffff888003f15e40
[26843.356241] R10: ffffc900011579c8 R11: 0000000000000038 R12: ffff8880175122c0
[26843.356273] R13: ffff8880065587a0 R14: ffff888011c5e200 R15: 0000000000000000
[26843.356308] FS: 00007592e8534740(0000) GS:ffff8880f7764000(0000) knlGS:0000000000000000
[26843.356340] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[26843.356367] CR2: 0000000000000050 CR3: 0000000017763000 CR4: 0000000000750ef0
[26843.356401] PKRU: 55555554
[26843.553977] Kernel panic - not syncing: Fatal exception
[26844.645767] Shutting down cpus with NMI
[26844.645894] Kernel Offset: disabled