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Date: Thu, 11 Apr 2024 12:15:52 +0000
To: "linux-bluetooth@vger.kernel.org" <linux-bluetooth@vger.kernel.org>
From: "Ryan J. Gray" <ryan@ryanjgray.com>
Subject: Bluetooth: hci0: SCO packet for unknown connection handle 257 (Kernel panic)
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Hey all,

I hope I've got the right list for this.

I ran into a bizarre problem a couple of days ago, where my laptop kernel =
panicked after I was in a voice call on Signal Desktop, using my Sony WH-1=
000XM5 Bluetooth headphones.

I'm using EndeavourOS, my kernel is:
Linux kvasir 6.8.2-arch2-1 #1 SMP PREEMPT_DYNAMIC Thu, 28 Mar 2024 17:06:3=
5 +0000 x86_64 GNU/Linux


My laptop:
Razer Blade 17 (2022) - has Intel AX211 WiFi/Bluetooth.


hci0 details:
[ =C2=A0 15.915176] Bluetooth: hci0: Device revision is 0[ =C2=A0 15.91517=
9] Bluetooth: hci0: Secure boot is enabled
[ =C2=A0 15.915180] Bluetooth: hci0: OTP lock is enabled
[ =C2=A0 15.915181] Bluetooth: hci0: API lock is enabled
[ =C2=A0 15.915181] Bluetooth: hci0: Debug lock is disabled
[ =C2=A0 15.915182] Bluetooth: hci0: Minimum firmware build 1 week 10 2014
[ =C2=A0 15.915183] Bluetooth: hci0: Bootloader timestamp 2019.40 buildtyp=
e 1 build 38
[ =C2=A0 15.915242] Bluetooth: hci0: DSM reset method type: 0x00
[ =C2=A0 15.918180] Bluetooth: hci0: Found device firmware: intel/ibt-0040=
-0041.sfi
[ =C2=A0 15.918197] Bluetooth: hci0: Boot Address: 0x100800
[ =C2=A0 15.918199] Bluetooth: hci0: Firmware Version: 60-48.23
[ =C2=A0 17.366978] Bluetooth: hci0: Waiting for firmware download to comp=
lete
[ =C2=A0 17.367360] Bluetooth: hci0: Firmware loaded in 1415209 usecs
[ =C2=A0 17.367554] Bluetooth: hci0: Waiting for device to boot
[ =C2=A0 17.383254] Bluetooth: hci0: Malformed MSFT vendor event: 0x02
[ =C2=A0 17.383319] Bluetooth: hci0: Device booted in 15524 usecs
[ =C2=A0 17.383983] Bluetooth: hci0: Found Intel DDC parameters: intel/ibt=
-0040-0041.ddc
[ =C2=A0 17.386302] Bluetooth: hci0: Applying Intel DDC parameters complet=
ed
[ =C2=A0 17.389362] Bluetooth: hci0: Firmware timestamp 2023.48 buildtype =
1 build 75324
[ =C2=A0 17.389381] Bluetooth: hci0: Firmware SHA1: 0x23bac558


Signal kept jumping between the hands-free mode of my headphones and the H=
Q audio mode pretty rapidly, so I switched off my headphones to continue t=
he call on mobile, as soon as I got a message/call in Signal I presume it =
tried to play the notification sound through my headphones (which weren't =
connected anymore), and the kernel panic happened.
It seems like Signal tried to use an old handle to my headphones, and that=
 caused the bluetooth kernel driver to crash, judging from the timing of t=
he journalctl messages?
It sounds to me like a use-after-free bug, but I don't really know enough =
about kernel driver development to try and narrow it down.


Here is a snippet of journalctl from the moment it kernel panicked:
Apr 09 16:28:04 kvasir kernel: Bluetooth: hci0: SCO packet for unknown con=
nection handle 257Apr 09 16:28:04 kvasir kernel: BUG: unable to handle pag=
e fault for address: 000000000000e84d
Apr 09 16:28:04 kvasir kernel: #PF: supervisor read access in kernel mode
Apr 09 16:28:04 kvasir kernel: #PF: error_code(0x0000) - not-present page
Apr 09 16:28:04 kvasir kernel: PGD 0 P4D 0
Apr 09 16:28:04 kvasir kernel: Oops: 0000 [#1] PREEMPT SMP NOPTI
Apr 09 16:28:04 kvasir kernel: CPU: 8 PID: 1489 Comm: systemd Tainted: P =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 OE =C2=A0 =C2=A0 =C2=A06.8.2-arch2-1 #1 =
a430fb92f7ba43092b62bbe6bac995458d3d442d
Apr 09 16:28:04 kvasir kernel: Hardware name: Razer Blade 17 (2022) - RZ09=
-0423/DI780, BIOS 1.09 01/10/2023
Apr 09 16:28:04 kvasir kernel: RIP: 0010:rb_first+0xf/0x30
Apr 09 16:28:04 kvasir kernel: Code: 10 c3 cc cc cc cc 0f 1f 44 00 00 90 9=
0 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 48 8b 07 48 85 c0 =
74 14 48 89 c2 <48> 8b 40 10 48 85 c0 75 f4 48 89 d0 c3 cc cc cc cc 31 d2 =
eb f4 66
Apr 09 16:28:04 kvasir kernel: RSP: 0018:ffffa0aec556bd18 EFLAGS: 00010202
Apr 09 16:28:04 kvasir kernel: RAX: 000000000000e83d RBX: ffff930c5911a200=
 RCX: 0000000001000078
Apr 09 16:28:04 kvasir kernel: RDX: 000000000000e83d RSI: 0000000000000000=
 RDI: ffff930c6570fdf8
Apr 09 16:28:04 kvasir kernel: RBP: ffff930c5911a700 R08: ffff930c4694cbd0=
 R09: 0000000001000078
Apr 09 16:28:04 kvasir kernel: R10: 0000000001000078 R11: ffffa0aec556bd18=
 R12: 0000000000000000
Apr 09 16:28:04 kvasir kernel: R13: ffff930c6570fdf8 R14: 0000000000000002=
 R15: 0000000000000000
Apr 09 16:28:04 kvasir kernel: FS: =C2=A000007f781c810880(0000) GS:ffff931=
3e2800000(0000) knlGS:0000000000000000
Apr 09 16:28:04 kvasir kernel: CS: =C2=A00010 DS: 0000 ES: 0000 CR0: 00000=
00080050033
Apr 09 16:28:04 kvasir kernel: CR2: 000000000000e84d CR3: 0000000113108000=
 CR4: 0000000000f50ef0
Apr 09 16:28:04 kvasir kernel: PKRU: 55555554
Apr 09 16:28:04 kvasir kernel: Call Trace:
Apr 09 16:28:04 kvasir kernel: =C2=A0<TASK>
Apr 09 16:28:04 kvasir kernel: =C2=A0? __die+0x23/0x70
Apr 09 16:28:04 kvasir kernel: =C2=A0? page_fault_oops+0x171/0x4e0
Apr 09 16:28:04 kvasir kernel: =C2=A0? exc_page_fault+0x7f/0x180
Apr 09 16:28:04 kvasir kernel: =C2=A0? asm_exc_page_fault+0x26/0x30
Apr 09 16:28:04 kvasir kernel: =C2=A0? rb_first+0xf/0x30
Apr 09 16:28:04 kvasir kernel: =C2=A0simple_xattrs_free+0x29/0x90
Apr 09 16:28:04 kvasir kernel: =C2=A0kernfs_put.part.0+0x60/0x150
Apr 09 16:28:04 kvasir kernel: =C2=A0evict+0xd4/0x1e0
Apr 09 16:28:04 kvasir kernel: =C2=A0__dentry_kill+0x6e/0x170
Apr 09 16:28:04 kvasir kernel: =C2=A0shrink_dentry_list+0x6b/0xe0
Apr 09 16:28:04 kvasir kernel: =C2=A0shrink_dcache_parent+0xd2/0x140
Apr 09 16:28:04 kvasir kernel: =C2=A0vfs_rmdir+0xb0/0x200
Apr 09 16:28:04 kvasir kernel: =C2=A0do_rmdir+0x1a9/0x1c0
Apr 09 16:28:04 kvasir kernel: =C2=A0__x64_sys_rmdir+0x42/0x70
Apr 09 16:28:04 kvasir kernel: =C2=A0do_syscall_64+0x86/0x170
Apr 09 16:28:04 kvasir kernel: =C2=A0? do_syscall_64+0x96/0x170
Apr 09 16:28:04 kvasir kernel: =C2=A0? syscall_exit_to_user_mode+0x80/0x23=
0
Apr 09 16:28:04 kvasir kernel: =C2=A0? do_syscall_64+0x96/0x170
Apr 09 16:28:04 kvasir kernel: =C2=A0? do_syscall_64+0x96/0x170
Apr 09 16:28:04 kvasir kernel: =C2=A0? do_syscall_64+0x96/0x170
Apr 09 16:28:04 kvasir kernel: =C2=A0entry_SYSCALL_64_after_hwframe+0x6e/0=
x76
Apr 09 16:28:04 kvasir kernel: RIP: 0033:0x7f781c31977b
Apr 09 16:28:04 kvasir kernel: Code: f0 ff ff 73 01 c3 48 8b 0d b2 c5 0d 0=
0 f7 d8 64 89 01 48 83 c8 ff c3 0f 1f 84 00 00 00 00 00 f3 0f 1e fa b8 54 =
00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 05 c3 0f 1f 40 00 48 8b 15 81 c5 0d =
00 f7 d8
Apr 09 16:28:04 kvasir kernel: RSP: 002b:00007fff45ca3498 EFLAGS: 00000246=
 ORIG_RAX: 0000000000000054
Apr 09 16:28:04 kvasir kernel: RAX: ffffffffffffffda RBX: 0000619355419610=
 RCX: 00007f781c31977b
Apr 09 16:28:04 kvasir kernel: RDX: 0000000000000000 RSI: 0000000000000001=
 RDI: 0000619355401a30
Apr 09 16:28:04 kvasir kernel: RBP: 00007fff45ca34f0 R08: 00007f781c4aa90a=
 R09: 0000000000000007
Apr 09 16:28:04 kvasir kernel: R10: 000061935540a7e0 R11: 0000000000000246=
 R12: 0000000000000001
Apr 09 16:28:04 kvasir kernel: R13: 0000000000000000 R14: 0000619355401a30=
 R15: 0000000000000000
Apr 09 16:28:04 kvasir kernel: =C2=A0</TASK>
Apr 09 16:28:04 kvasir kernel: Modules linked in: uinput snd_seq_dummy snd=
_hrtimer snd_seq snd_seq_device rfcomm snd_ctl_led ledtrig_audio uhid cmac=
 snd_soc_skl_hda_dsp algif_hash snd_soc_hdac_hdmi snd_soc_intel_hda_dsp_co=
mmon snd_>
Apr 09 16:28:04 kvasir kernel: =C2=A0nf_tables snd_intel_dspcfg kvm_intel =
libcrc32c snd_intel_sdw_acpi i915 mac80211 uvcvideo btusb snd_hda_codec vi=
deobuf2_vmalloc kvm btrtl uvc videobuf2_memops libarc4 snd_hda_core btinte=
l processor_th>
Apr 09 16:28:04 kvasir kernel: =C2=A0int3403_thermal int3400_thermal intel=
_hid pmt_telemetry int340x_thermal_zone acpi_thermal_rel sparse_keymap pmt=
_class acpi_tad acpi_pad mac_hid fuse loop nfnetlink ip_tables x_tables ex=
t4 crc32c_gene>
Apr 09 16:28:04 kvasir kernel: CR2: 000000000000e84d
Apr 09 16:28:04 kvasir kernel: ---[ end trace 0000000000000000 ]---
Apr 09 16:28:04 kvasir kernel: RIP: 0010:rb_first+0xf/0x30
Apr 09 16:28:04 kvasir kernel: Code: 10 c3 cc cc cc cc 0f 1f 44 00 00 90 9=
0 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 48 8b 07 48 85 c0 =
74 14 48 89 c2 <48> 8b 40 10 48 85 c0 75 f4 48 89 d0 c3 cc cc cc cc 31 d2 =
eb f4 66
Apr 09 16:28:04 kvasir kernel: RSP: 0018:ffffa0aec556bd18 EFLAGS: 00010202
Apr 09 16:28:04 kvasir kernel: RAX: 000000000000e83d RBX: ffff930c5911a200=
 RCX: 0000000001000078
Apr 09 16:28:04 kvasir kernel: RDX: 000000000000e83d RSI: 0000000000000000=
 RDI: ffff930c6570fdf8
Apr 09 16:28:04 kvasir kernel: RBP: ffff930c5911a700 R08: ffff930c4694cbd0=
 R09: 0000000001000078
Apr 09 16:28:04 kvasir kernel: R10: 0000000001000078 R11: ffffa0aec556bd18=
 R12: 0000000000000000
Apr 09 16:28:04 kvasir kernel: R13: ffff930c6570fdf8 R14: 0000000000000002=
 R15: 0000000000000000
Apr 09 16:28:04 kvasir kernel: FS: =C2=A000007f781c810880(0000) GS:ffff931=
3e2800000(0000) knlGS:0000000000000000
Apr 09 16:28:04 kvasir kernel: CS: =C2=A00010 DS: 0000 ES: 0000 CR0: 00000=
00080050033
Apr 09 16:28:04 kvasir kernel: CR2: 000000000000e84d CR3: 0000000113108000=
 CR4: 0000000000f50ef0
Apr 09 16:28:04 kvasir kernel: PKRU: 55555554
Apr 09 16:28:04 kvasir kernel: note: systemd[1489] exited with irqs disabl=
ed
Apr 09 16:28:04 kvasir systemd[1]: user@1000.service: Main process exited,=
 code=3Dkilled, status=3D9/KILL
Apr 09 16:28:04 kvasir systemd[1]: user@1000.service: Killing process 2051=
 (xdg-permission-) with signal SIGKILL.
Apr 09 16:28:04 kvasir (sd-pam)[1491]: pam_unix(systemd-user:session): ses=
sion closed for user <snip>
Apr 09 16:28:04 kvasir kernel: traps: ThreadPoolSingl[54126] trap int3 ip:=
60260199ba4a sp:79c68adfe6a0 error:0 in signal-desktop[6025fdd77000+816d00=
0]
Apr 09 16:28:04 kvasir systemd[1]: user@1000.service: Killing process 1508=
 (dbus-broker-lau) with signal SIGKILL.

Any help would be greatly appreciated.


Let me know if I can provide any more information to help narrow this down=
, it's a weird bug.


Thanks,
Ryan.
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