------------[ cut here ]------------ ODEBUG: free active (active state 0) object: ffff88802f090b20 object type: hrtimer hint: dummy_hrtimer_callback+0x0/0x160 sound/drivers/dummy.c:325 WARNING: lib/debugobjects.c:629 at debug_print_object+0x198/0x2b0 lib/debugobjects.c:629, CPU#1: syz.4.1617/10811 Modules linked in: CPU: 1 UID: 0 PID: 10811 Comm: syz.4.1617 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 RIP: 0010:debug_print_object+0x1a5/0x2b0 lib/debugobjects.c:629 Code: b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 75 4f 48 8d 3d 78 14 1c 0c 41 56 48 8b 14 ed 40 20 62 8c 4c 89 e6 <67> 48 0f b9 3a 58 83 05 22 72 11 0c 01 48 83 c4 18 5b 5d 41 5c 41 RSP: 0018:ffffc90006a47b48 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: ffffc90006a47c30 RCX: 0000000000000000 RDX: ffffffff8c621f80 RSI: ffffffff8c621b20 RDI: ffffffff914fd150 RBP: 0000000000000003 R08: ffff88802f090b20 R09: ffffffff8bf32760 R10: 0000000000000001 R11: 0000000000000000 R12: ffffffff8c621b20 R13: ffffffff8bf327a0 R14: ffffffff896afdd0 R15: ffffc90006a47c48 FS: 000055559500b500(0000) GS:ffff8880d5c61000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f41c6beb840 CR3: 000000005eccd000 CR4: 0000000000352ef0 Call Trace: __debug_check_no_obj_freed lib/debugobjects.c:1171 [inline] debug_check_no_obj_freed+0x4da/0x630 lib/debugobjects.c:1201 slab_free_hook mm/slub.c:2679 [inline] slab_free mm/slub.c:6499 [inline] kfree+0x3d6/0x6d0 mm/slub.c:6792 dummy_pcm_close+0x9a/0xd0 sound/drivers/dummy.c:609 snd_pcm_release_substream.part.0+0x114/0x340 sound/core/pcm_native.c:2793 snd_pcm_release_substream sound/core/pcm_native.c:2786 [inline] snd_pcm_release+0x10f/0x230 sound/core/pcm_native.c:2983 __fput+0x3ff/0xb50 fs/file_table.c:512 task_work_run+0x150/0x240 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+0x1d8/0x700 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+0x661/0x790 arch/x86/entry/syscall_64.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f41c6b9e159 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:00007ffdfe09ab58 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4 RAX: 0000000000000000 RBX: 00007f41c6e27da0 RCX: 00007f41c6b9e159 RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003 RBP: 00007f41c6e27da0 R08: 0000000000000006 R09: 0000000000000000 R10: 000000000003fcbc R11: 0000000000000246 R12: 000000000002f86a R13: 00007f41c6e25fac R14: 00007f41c6e25fa8 R15: 00007f41c6e25fa0 ---------------- Code disassembly (best guess): 0: b8 00 00 00 00 mov $0x0,%eax 5: 00 fc add %bh,%ah 7: ff lcall (bad) 8: df 48 89 fisttps -0x77(%rax) b: fa cli c: 48 c1 ea 03 shr $0x3,%rdx 10: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) 14: 75 4f jne 0x65 16: 48 8d 3d 78 14 1c 0c lea 0xc1c1478(%rip),%rdi # 0xc1c1495 1d: 41 56 push %r14 1f: 48 8b 14 ed 40 20 62 mov -0x739ddfc0(,%rbp,8),%rdx 26: 8c 27: 4c 89 e6 mov %r12,%rsi * 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction 2f: 58 pop %rax 30: 83 05 22 72 11 0c 01 addl $0x1,0xc117222(%rip) # 0xc117259 37: 48 83 c4 18 add $0x18,%rsp 3b: 5b pop %rbx 3c: 5d pop %rbp 3d: 41 5c pop %r12 3f: 41 rex.B