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:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to :content-type; bh=znwQLx4ttLCAahi4lYkTwRyA0+r8xuDmAlKgFKQsAFo=; b=e790kTHphvEgAzVasQQ+N3X1npPz618Ck0yJEGi7xepM5dAaDoMhNkXOzc+TEgChvr 2xl02r0P9JFxkZTQD8pG7qUEtxPbO3iUs3C7OO3tfzE9VxPfDvfBIMgkyqmVcVzljGy0 iI7zodPgiN3NoRfBJvHcLlXg7x2zR1HMC9FLeinsyeF/p6XHnKP3g6WinUO3z+6valvo efo9hjZy6uwihzkWDFxZi1qaw77Di/rZ+cdJ62VXeUS2LUvF1jspH+KV5umqHO5f6Sel 5nQipZS+VYkf0CstT17dHEGFnGU9T1pf0Z54tTCN1EhYdRgAer9nFwjf0ws2fqJTDY4v //Lg== X-Gm-Message-State: AFuF++l33jQFr5yLXkQZ5ZhCQkBjdmSAkR9lSMMcrynm2kmu0z1fo+md Ct3EGTe1U3Tj7X/Laqjq6x4DyhKTnrUkhnceJ83mjxQy/As++B+o5Vzcc3NePVUuLOF4aaokDea ZqDmwzkxfl7gN+4AhfW9Yib6jVHDIN/4pX5rdQy/wuVGiDS9MdDGjOQNuO1JLoQ== Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6808:3505:b0:493:a860:5809 with SMTP id 5614622812f47-4b3668b1451mr8453659b6e.4.1787760104366; Wed, 26 Aug 2026 09:01:44 -0700 (PDT) Date: Wed, 26 Aug 2026 09:01:44 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a8f0de8.1d9ded08.62e62.00b5.GAE@google.com> Subject: [syzbot] [sound?] WARNING: ODEBUG bug in dummy_pcm_close From: syzbot To: linux-kernel@vger.kernel.org, linux-sound@vger.kernel.org, perex@perex.cz, syzkaller-bugs@googlegroups.com, tiwai@suse.com Content-Type: text/plain; charset="UTF-8" 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: __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 ---------------- 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 --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup