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BUG: looking up invalid subclass: 8

Status: fixed on 2018/02/01 10:32
Subsystems: sound
[Documentation on labels]
Reported-by: syzbot+5e11c83d62924135b4d6f902434d4c243acef8a5@syzkaller.appspotmail.com
Fix commit: 3510c7aa069a ALSA: seq: Avoid invalid lockdep class warning
First crash: 2532d, last: 2532d
▶ ▼ Similar bugs (2)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-4.14 BUG: looking up invalid subclass: 8 C error 12 694d 1653d 0/1 upstream: reported C repro on 2020/04/03 18:19
linux-4.19 BUG: looking up invalid subclass: 8 C error 37 695d 1702d 0/1 upstream: reported C repro on 2020/02/15 04:55

Sample crash report:
turning off the locking correctness validator.
CPU: 1 PID: 2991 Comm: syzkaller370690 Not tainted 4.14.0-rc8+ #164
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x194/0x257 lib/dump_stack.c:53
 look_up_lock_class kernel/locking/lockdep.c:674 [inline]
 register_lock_class+0x5f2/0x2c70 kernel/locking/lockdep.c:757
 __lock_acquire+0x224/0x3d50 kernel/locking/lockdep.c:3377
 lock_acquire+0x1d5/0x580 kernel/locking/lockdep.c:3994
 down_read_nested+0x9a/0x150 kernel/locking/rwsem.c:141
 deliver_to_subscribers sound/core/seq/seq_clientmgr.c:666 [inline]
 snd_seq_deliver_event+0x27f/0x790 sound/core/seq/seq_clientmgr.c:807
 snd_seq_kernel_client_dispatch+0x11e/0x150 sound/core/seq/seq_clientmgr.c:2313
 dummy_input+0x2c4/0x400 sound/core/seq/seq_dummy.c:104
 snd_seq_deliver_single_event.constprop.11+0x2fb/0x940 sound/core/seq/seq_clientmgr.c:621
 deliver_to_subscribers sound/core/seq/seq_clientmgr.c:676 [inline]
 snd_seq_deliver_event+0x31e/0x790 sound/core/seq/seq_clientmgr.c:807
 snd_seq_kernel_client_dispatch+0x11e/0x150 sound/core/seq/seq_clientmgr.c:2313
 dummy_input+0x2c4/0x400 sound/core/seq/seq_dummy.c:104
 snd_seq_deliver_single_event.constprop.11+0x2fb/0x940 sound/core/seq/seq_clientmgr.c:621
 deliver_to_subscribers sound/core/seq/seq_clientmgr.c:676 [inline]
 snd_seq_deliver_event+0x31e/0x790 sound/core/seq/seq_clientmgr.c:807
 snd_seq_kernel_client_dispatch+0x11e/0x150 sound/core/seq/seq_clientmgr.c:2313
 dummy_input+0x2c4/0x400 sound/core/seq/seq_dummy.c:104
 snd_seq_deliver_single_event.constprop.11+0x2fb/0x940 sound/core/seq/seq_clientmgr.c:621
 deliver_to_subscribers sound/core/seq/seq_clientmgr.c:676 [inline]
 snd_seq_deliver_event+0x31e/0x790 sound/core/seq/seq_clientmgr.c:807
 snd_seq_kernel_client_dispatch+0x11e/0x150 sound/core/seq/seq_clientmgr.c:2313
 dummy_input+0x2c4/0x400 sound/core/seq/seq_dummy.c:104
 snd_seq_deliver_single_event.constprop.11+0x2fb/0x940 sound/core/seq/seq_clientmgr.c:621
 deliver_to_subscribers sound/core/seq/seq_clientmgr.c:676 [inline]
 snd_seq_deliver_event+0x31e/0x790 sound/core/seq/seq_clientmgr.c:807
 snd_seq_kernel_client_dispatch+0x11e/0x150 sound/core/seq/seq_clientmgr.c:2313
 dummy_input+0x2c4/0x400 sound/core/seq/seq_dummy.c:104
 snd_seq_deliver_single_event.constprop.11+0x2fb/0x940 sound/core/seq/seq_clientmgr.c:621
 deliver_to_subscribers sound/core/seq/seq_clientmgr.c:676 [inline]
 snd_seq_deliver_event+0x31e/0x790 sound/core/seq/seq_clientmgr.c:807
 snd_seq_kernel_client_dispatch+0x11e/0x150 sound/core/seq/seq_clientmgr.c:2313
 dummy_input+0x2c4/0x400 sound/core/seq/seq_dummy.c:104
 snd_seq_deliver_single_event.constprop.11+0x2fb/0x940 sound/core/seq/seq_clientmgr.c:621
 deliver_to_subscribers sound/core/seq/seq_clientmgr.c:676 [inline]
 snd_seq_deliver_event+0x31e/0x790 sound/core/seq/seq_clientmgr.c:807
 snd_seq_kernel_client_dispatch+0x11e/0x150 sound/core/seq/seq_clientmgr.c:2313
 dummy_input+0x2c4/0x400 sound/core/seq/seq_dummy.c:104
 snd_seq_deliver_single_event.constprop.11+0x2fb/0x940 sound/core/seq/seq_clientmgr.c:621
 snd_seq_deliver_event+0x12c/0x790 sound/core/seq/seq_clientmgr.c:818
 snd_seq_kernel_client_dispatch+0x11e/0x150 sound/core/seq/seq_clientmgr.c:2313
 snd_seq_oss_dispatch sound/core/seq/oss/seq_oss_device.h:150 [inline]
 snd_seq_oss_midi_reset+0x44b/0x700 sound/core/seq/oss/seq_oss_midi.c:481
 snd_seq_oss_synth_reset+0x398/0x980 sound/core/seq/oss/seq_oss_synth.c:416
 snd_seq_oss_reset+0x6c/0x260 sound/core/seq/oss/seq_oss_init.c:448
 snd_seq_oss_release+0x71/0x120 sound/core/seq/oss/seq_oss_init.c:425
 odev_release+0x52/0x70 sound/core/seq/oss/seq_oss.c:153
 __fput+0x327/0x7e0 fs/file_table.c:210
 ____fput+0x15/0x20 fs/file_table.c:244
 task_work_run+0x199/0x270 kernel/task_work.c:113
 exit_task_work include/linux/task_work.h:22 [inline]
 do_exit+0x9b5/0x1ad0 kernel/exit.c:865
 do_group_exit+0x149/0x400 kernel/exit.c:968
 SYSC_exit_group kernel/exit.c:979 [inline]
 SyS_exit_group+0x1d/0x20 kernel/exit.c:977
 entry_SYSCALL_64_fastpath+0x1f/0xbe
RIP: 0033:0x442c58
RSP: 002b:00007ffdaf8554a

Crashes (5):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2017/11/06 15:41 upstream 39dae59d66ac 3520854b .config console log report syz C ci-upstream-kasan-gce-386
2017/11/06 15:32 linux-next 5a3517e009e9 e0a2b195 .config console log report syz C ci-upstream-next-kasan-gce
2017/11/06 15:28 linux-next 5a3517e009e9 e0a2b195 .config console log report syz C ci-upstream-next-kasan-gce
2017/11/06 15:41 upstream 39dae59d66ac 3520854b .config console log report syz ci-upstream-kasan-gce-386
2017/11/06 14:37 linux-next 5a3517e009e9 e0a2b195 .config console log report ci-upstream-next-kasan-gce
* Struck through repros no longer work on HEAD.