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* [syzbot] [sound?] WARNING: ODEBUG bug in dummy_pcm_close
@ 2026-08-26 16:01 syzbot
  2026-08-27  6:03 ` syzbot
  0 siblings, 1 reply; 2+ messages in thread
From: syzbot @ 2026-08-26 16:01 UTC (permalink / raw)
  To: linux-kernel, linux-sound, perex, syzkaller-bugs, tiwai

Hello,

syzbot found the following issue on:

HEAD commit:    66498c75b4f8 Merge tag 'dmaengine-7.3-rc1' of git://git.ke..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=123b9979580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=e9ce1d694820ba2b
dashboard link: https://syzkaller.appspot.com/bug?extid=225231fce6755d40d078
compiler:       Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=12b29415580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/d0a47f9dd2f2/disk-66498c75.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/9d5e64d02b84/vmlinux-66498c75.xz
kernel image: https://storage.googleapis.com/syzbot-assets/f14557ff09c4/bzImage-66498c75.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+225231fce6755d40d078@syzkaller.appspotmail.com

------------[ cut here ]------------
ODEBUG: free active (active state 0) object: ffff8880213f7f20 object type: hrtimer hint: dummy_hrtimer_callback+0x0/0x150 sound/drivers/dummy.c:-1
WARNING: lib/debugobjects.c:632 at debug_print_object+0xec/0x230 lib/debugobjects.c:629, CPU#1: syz.0.66/5973
Modules linked in:
CPU: 1 UID: 0 PID: 5973 Comm: syz.0.66 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:debug_print_object+0x18a/0x230 lib/debugobjects.c:629
Code: f8 48 c1 e8 03 80 3c 18 00 74 08 4c 89 ff e8 3d 70 4f fd 4d 8b 0f 4c 89 ef 48 8b 74 24 08 48 89 ea 44 89 e1 4d 89 f0 ff 34 24 <67> 48 0f b9 3a 48 83 c4 08 ff 05 73 77 92 0b 48 83 c4 10 5b 41 5c
RSP: 0018:ffffc90003a37b70 EFLAGS: 00010246
RAX: 1ffffffff181f12c RBX: dffffc0000000000 RCX: 0000000000000000
RDX: ffffffff8c6d6340 RSI: ffffffff8c6d5dc0 RDI: ffffffff9084dfc0
RBP: ffffffff8c6d6340 R08: ffff8880213f7f20 R09: ffffffff8c0f8ba0
R10: dffffc0000000000 R11: ffffffff81b3d530 R12: 0000000000000000
R13: ffffffff9084dfc0 R14: ffff8880213f7f20 R15: ffffffff8c0f8960
FS:  000055557a276500(0000) GS:ffff888124df1000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc4e5ef7d58 CR3: 000000007ed3e000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 __debug_check_no_obj_freed lib/debugobjects.c:1171 [inline]
 debug_check_no_obj_freed+0x2e3/0x450 lib/debugobjects.c:1201
 slab_free_hook mm/slub.c:2679 [inline]
 slab_free mm/slub.c:6499 [inline]
 kfree+0x13e/0x650 mm/slub.c:6792
 dummy_pcm_close+0x9b/0xb0 sound/drivers/dummy.c:609
 snd_pcm_release_substream+0x313/0x490 sound/core/pcm_native.c:2793
 snd_pcm_release+0xb6/0x160 sound/core/pcm_native.c:2983
 __fput+0x418/0xa50 fs/file_table.c:512
 task_work_run+0x1d9/0x270 kernel/task_work.c:233
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 __exit_to_user_mode_loop kernel/entry/common.c:70 [inline]
 exit_to_user_mode_loop+0x204/0x770 kernel/entry/common.c:101
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:336 [inline]
 do_syscall_64+0x328/0x520 arch/x86/entry/syscall_64.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc4e4f9e0d9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffc47a4ba18 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007fc4e5227da0 RCX: 00007fc4e4f9e0d9
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007fc4e5227da0 R08: 00007fc4e5226038 R09: 0000000000000000
R10: 000000000003fdc0 R11: 0000000000000246 R12: 00000000000175a9
R13: 00007fc4e522609c R14: 000000000001729d R15: 00007fc4e5226090
 </TASK>
----------------
Code disassembly (best guess):
   0:	f8                   	clc
   1:	48 c1 e8 03          	shr    $0x3,%rax
   5:	80 3c 18 00          	cmpb   $0x0,(%rax,%rbx,1)
   9:	74 08                	je     0x13
   b:	4c 89 ff             	mov    %r15,%rdi
   e:	e8 3d 70 4f fd       	call   0xfd4f7050
  13:	4d 8b 0f             	mov    (%r15),%r9
  16:	4c 89 ef             	mov    %r13,%rdi
  19:	48 8b 74 24 08       	mov    0x8(%rsp),%rsi
  1e:	48 89 ea             	mov    %rbp,%rdx
  21:	44 89 e1             	mov    %r12d,%ecx
  24:	4d 89 f0             	mov    %r14,%r8
  27:	ff 34 24             	push   (%rsp)
* 2a:	67 48 0f b9 3a       	ud1    (%edx),%rdi <-- trapping instruction
  2f:	48 83 c4 08          	add    $0x8,%rsp
  33:	ff 05 73 77 92 0b    	incl   0xb927773(%rip)        # 0xb9277ac
  39:	48 83 c4 10          	add    $0x10,%rsp
  3d:	5b                   	pop    %rbx
  3e:	41 5c                	pop    %r12


---
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^ permalink raw reply	[flat|nested] 2+ messages in thread
end of thread, other threads:[~2026-08-27  6:03 UTC | newest]

Thread overview: 2+ messages (download: mbox.gz / follow: Atom feed)
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2026-08-26 16:01 [syzbot] [sound?] WARNING: ODEBUG bug in dummy_pcm_close syzbot
2026-08-27  6:03 ` syzbot

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