EXT4-fs (loop0): re-mounted. Opts: (null) EXT4-fs (loop0): re-mounted. Opts: (null) EXT4-fs (loop0): re-mounted. Opts: (null) EXT4-fs (loop0): re-mounted. Opts: (null) INFO: task syz-executor579:8117 blocked for more than 140 seconds. Not tainted 4.19.211-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor579 D27632 8117 8115 0x00000000 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x887/0x2040 kernel/sched/core.c:3517 schedule+0x8d/0x1b0 kernel/sched/core.c:3561 schedule_timeout+0x92d/0xfe0 kernel/time/timer.c:1794 do_wait_for_common kernel/sched/completion.c:83 [inline] __wait_for_common kernel/sched/completion.c:104 [inline] wait_for_common+0x29c/0x470 kernel/sched/completion.c:115 kthread_stop+0x109/0x6b0 kernel/kthread.c:588 ext4_put_super+0x93c/0x1010 fs/ext4/super.c:1054 generic_shutdown_super+0x144/0x370 fs/super.c:456 kill_block_super+0x97/0xf0 fs/super.c:1185 deactivate_locked_super+0x94/0x160 fs/super.c:329 deactivate_super+0x174/0x1a0 fs/super.c:360 cleanup_mnt+0x1a8/0x290 fs/namespace.c:1098 task_work_run+0x148/0x1c0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:193 [inline] exit_to_usermode_loop+0x251/0x2a0 arch/x86/entry/common.c:167 prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline] syscall_return_slowpath arch/x86/entry/common.c:271 [inline] do_syscall_64+0x538/0x620 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f4f40d1f3e7 Code: Bad RIP value. RSP: 002b:00007ffec274c618 EFLAGS: 00000206 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007f4f40d1f3e7 RDX: 00007ffec274c6db RSI: 000000000000000a RDI: 00007ffec274c6d0 RBP: 00007ffec274c6d0 R08: 00000000ffffffff R09: 00007ffec274c4b0 R10: 000055555734a683 R11: 0000000000000206 R12: 00007ffec274d740 R13: 000055555734a5f0 R14: 00007ffec274c640 R15: 00000000000000ec Showing all locks held in the system: 1 lock held by khungtaskd/1570: #0: 0000000034e37715 (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 kernel/locking/lockdep.c:4441 1 lock held by in:imklog/7814: #0: 00000000fd65db30 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x26f/0x310 fs/file.c:767 1 lock held by syz-executor579/8117: #0: 00000000fb7a01c7 (&type->s_umount_key#34){++++}, at: deactivate_super+0x16c/0x1a0 fs/super.c:359 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1570 Comm: khungtaskd Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1fc/0x2ef lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x63/0xa2 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1a6/0x1f0 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:203 [inline] watchdog+0x991/0xe60 kernel/hung_task.c:287 kthread+0x33f/0x460 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 4692 Comm: systemd-journal Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__lock_acquire+0x3d9/0x3ff0 kernel/locking/lockdep.c:3359 Code: 85 46 28 00 00 48 8b 84 24 d8 01 00 00 49 8d 7a 10 48 89 fa 48 c1 ea 03 49 89 42 08 48 b8 00 00 00 00 00 fc ff df 80 3c 02 00 <0f> 85 43 28 00 00 48 b8 00 00 00 00 00 fc ff df 4d 89 72 10 4d 8d RSP: 0018:ffff8880a0dcfa38 EFLAGS: 00000046 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000002 RDX: 1ffff110141b89c8 RSI: 1ffff110141b89c5 RDI: ffff8880a0dc4e40 RBP: 0000000000000000 R08: 0000000000000002 R09: 0000000000000001 R10: ffff8880a0dc4e30 R11: 0000000000000000 R12: 0000000000000001 R13: ffff8880a0dc4580 R14: ffffffff8a462a78 R15: 0000000000000001 FS: 00007fd5293d48c0(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fd5267b7000 CR3: 00000000a1009000 CR4: 00000000003406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lock_acquire+0x170/0x3c0 kernel/locking/lockdep.c:3908 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:144 alloc_object lib/debugobjects.c:174 [inline] __debug_object_init+0x145/0x9b0 lib/debugobjects.c:387 debug_object_init lib/debugobjects.c:431 [inline] debug_object_activate+0x382/0x450 lib/debugobjects.c:512 debug_rcu_head_queue kernel/rcu/rcu.h:193 [inline] __call_rcu.constprop.0+0x31/0x7f0 kernel/rcu/tree.c:2977 task_work_run+0x148/0x1c0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:193 [inline] exit_to_usermode_loop+0x251/0x2a0 arch/x86/entry/common.c:167 prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline] syscall_return_slowpath arch/x86/entry/common.c:271 [inline] do_syscall_64+0x538/0x620 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7fd528963840 Code: 73 01 c3 48 8b 0d 68 77 20 00 f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 83 3d 89 bb 20 00 00 75 10 b8 02 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 1e f6 ff ff 48 89 04 24 RSP: 002b:00007ffda68ee018 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: fffffffffffffffe RBX: 00007ffda68ee320 RCX: 00007fd528963840 RDX: 00000000000001a0 RSI: 0000000000080042 RDI: 000055aebf7cb390 RBP: 000000000000000d R08: 000000000000c0ff R09: 00000000ffffffff R10: 0000000000000069 R11: 0000000000000246 R12: 00000000ffffffff R13: 000055aebf7bf040 R14: 00007ffda68ee2e0 R15: 000055aebf7cace0 ---------------- Code disassembly (best guess): 0: 85 46 28 test %eax,0x28(%rsi) 3: 00 00 add %al,(%rax) 5: 48 8b 84 24 d8 01 00 mov 0x1d8(%rsp),%rax c: 00 d: 49 8d 7a 10 lea 0x10(%r10),%rdi 11: 48 89 fa mov %rdi,%rdx 14: 48 c1 ea 03 shr $0x3,%rdx 18: 49 89 42 08 mov %rax,0x8(%r10) 1c: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 23: fc ff df 26: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) * 2a: 0f 85 43 28 00 00 jne 0x2873 <-- trapping instruction 30: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 37: fc ff df 3a: 4d 89 72 10 mov %r14,0x10(%r10) 3e: 4d rex.WRB 3f: 8d .byte 0x8d