When there is a race to receive a notification, the failing tasks
oopes when erroring
[ 196.140988] BUG: kernel NULL pointer dereference, address: 0000000000000000
[ 196.140995] #PF: supervisor read access in kernel mode
[ 196.140996] #PF: error_code(0x0000) - not-present page
[ 196.140997] PGD 0 P4D 0
[ 196.140999] Oops: 0000 [#1] PREEMPT SMP NOPTI
[ 196.141001] CPU: 0 PID: 2316 Comm: aa-prompt Not tainted 6.5.0-9-generic #9-\
Ubuntu
[ 196.141004] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.15.0-\
1 04/01/2014
[ 196.141005] RIP: 0010:aa_listener_unotif_recv+0x11d/0x260
[ 196.141011] Code: ff ff ff 8b 55 d0 48 8b 75 c8 4c 89 ef e8 6b db ff ff 49 8\
9 c2 48 85 c0 0f 88 c0 00 00 00 0f 84 25 ff ff ff 8b 05 3b 1c 1f 03 <49> 8b 55 \
00 83 e0 20 83 7a 08 07 74 66 85 c0 0f 85 01 01 00 00 48
[ 196.141012] RSP: 0018:ffffa2674075fdd8 EFLAGS: 00010246
[ 196.141014] RAX: 0000000000000000 RBX: ffff974507a08404 RCX: 000000000000000\
0
[ 196.141017] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000000000000\
0
[ 196.141017] RBP: ffffa2674075fe10 R08: 0000000000000000 R09: 000000000000000\
0
[ 196.141018] R10: fffffffffffffffe R11: 0000000000000000 R12: ffff974507a0840\
0
[ 196.141019] R13: 0000000000000000 R14: ffff974507a08430 R15: ffff97451de00a0\
0
[ 196.141020] FS: 00007f4ab6b30740(0000) GS:ffff97486fa00000(0000) knlGS:0000\
000000000000
[ 196.141022] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 196.141024] CR2: 0000000000000000 CR3: 0000000104cf2003 CR4: 0000000000770ef\
0
[ 196.141026] PKRU: 55555554
[ 196.141027] Call Trace:
[ 196.141032] <TASK>
[ 196.141034] ? show_regs+0x6d/0x80
[ 196.141041] ? __die+0x24/0x80
[ 196.141043] ? page_fault_oops+0x99/0x1b0
[ 196.141047] ? do_user_addr_fault+0x316/0x6b0
[ 196.141048] ? filemap_map_pages+0x2b3/0x460
[ 196.141056] ? exc_page_fault+0x83/0x1b0
[ 196.141068] ? asm_exc_page_fault+0x27/0x30
[ 196.141079] ? aa_listener_unotif_recv+0x11d/0x260
[ 196.141081] ? aa_listener_unotif_recv+0x184/0x260
[ 196.141083] listener_ioctl+0x1e1/0x260
[ 196.141088] __x64_sys_ioctl+0xa0/0xf0
[ 196.141092] do_syscall_64+0x59/0x90
[ 196.141094] ? do_user_addr_fault+0x238/0x6b0
[ 196.141095] ? exit_to_user_mode_prepare+0x30/0xb0
[ 196.141100] ? irqentry_exit_to_user_mode+0x17/0x20
[ 196.141104] ? irqentry_exit+0x43/0x50
[ 196.141106] ? exc_page_fault+0x94/0x1b0
[ 196.141107] entry_SYSCALL_64_after_hwframe+0x6e/0xd8
[ 196.141109] RIP: 0033:0x7f4ab69238ef
[ 196.141124] Code: 00 48 89 44 24 18 31 c0 48 8d 44 24 60 c7 04 24 10 00 00 0\
0 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 18 48 8b 44 24 18 64 48 2b 04 25 28 00 00
[ 196.141125] RSP: 002b:00007ffd607a9020 EFLAGS: 00000246 ORIG_RAX: 0000000000\
000010
[ 196.141127] RAX: ffffffffffffffda RBX: 00007ffd607a9100 RCX: 00007f4ab69238e\
f
[ 196.141128] RDX: 00007ffd607a9100 RSI: 00000000c008f804 RDI: 000000000000000\
3
[ 196.141128] RBP: 0000000000000003 R08: 0000000000000001 R09: 00007f4ab6b3074\
0
[ 196.141129] R10: 00007f4ab6b7f0a0 R11: 0000000000000246 R12: 00007ffd607a90a\
0
[ 196.141130] R13: 00007ffd607a90dc R14: 0000559564822c10 R15: 000000000003100\
0
[ 196.141131] </TASK>
[ 196.141132] Modules linked in: snd_seq_dummy snd_hrtimer binfmt_misc nls_iso\
8859_1 intel_rapl_msr intel_rapl_common snd_hda_codec_generic ledtrig_audio snd\
_hda_intel snd_intel_dspcfg snd_intel_sdw_acpi snd_hda_codec snd_hda_core snd_h\
wdep snd_pcm kvm_intel snd_seq_midi snd_seq_midi_event kvm irqbypass crct10dif_\
pclmul polyval_clmulni polyval_generic ghash_clmulni_intel aesni_intel crypto_s\
imd cryptd rapl joydev snd_rawmidi snd_seq i2c_i801 i2c_smbus snd_seq_device sn\
d_timer qxl snd drm_ttm_helper lpc_ich soundcore ttm 9pnet_virtio 9pnet drm_kms\
_helper input_leds mac_hid serio_raw nfsd msr parport_pc auth_rpcgss ppdev nfs_\
acl lockd grace lp parport drm efi_pstore sunrpc dmi_sysfs qemu_fw_cfg ip_table\
s x_tables autofs4 hid_generic usbhid hid ahci crc32_pclmul psmouse xhci_pci li\
bahci virtio_rng xhci_pci_renesas
[ 196.141188] CR2: 0000000000000000
[ 196.141190] ---[ end trace 0000000000000000 ]---
This bug is missing log files that will aid in diagnosing the problem. While running an Ubuntu kernel (not a mainline or third-party kernel) please enter the following command in a terminal window:
apport-collect 2040245
and then change the status of the bug to 'Confirmed'.
If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.
This change has been made by an automated script, maintained by the Ubuntu Kernel Team.