INFO: task syz-executor.2:9629 blocked for more than 143 seconds. Not tainted 5.15.0-rc3-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.2 state:D stack:23936 pid: 9629 ppid: 1 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:4940 [inline] __schedule+0x940/0x26f0 kernel/sched/core.c:6287 schedule+0xd3/0x270 kernel/sched/core.c:6366 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6425 __mutex_lock_common kernel/locking/mutex.c:669 [inline] __mutex_lock+0xa34/0x12f0 kernel/locking/mutex.c:729 fuse_lock_inode+0xce/0x100 fs/fuse/inode.c:427 fuse_lookup.part.0+0x86/0x390 fs/fuse/dir.c:423 fuse_lookup+0x70/0x90 fs/fuse/dir.c:420 __lookup_slow+0x24c/0x480 fs/namei.c:1657 lookup_slow fs/namei.c:1674 [inline] walk_component+0x40f/0x6a0 fs/namei.c:1970 link_path_walk.part.0+0x757/0xd00 fs/namei.c:2297 link_path_walk fs/namei.c:2221 [inline] path_lookupat+0xc8/0x860 fs/namei.c:2448 filename_lookup+0x1c6/0x590 fs/namei.c:2478 user_path_at_empty+0x42/0x60 fs/namei.c:2801 user_path_at include/linux/namei.h:57 [inline] ksys_umount fs/namespace.c:1773 [inline] __do_sys_umount fs/namespace.c:1781 [inline] __se_sys_umount fs/namespace.c:1779 [inline] __x64_sys_umount+0xf8/0x180 fs/namespace.c:1779 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f63f12d6d37 RSP: 002b:00007ffe148b8d48 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 RAX: ffffffffffffffda RBX: 0000000000000683 RCX: 00007f63f12d6d37 RDX: 00007ffe148b8e20 RSI: 0000000000000002 RDI: 00007ffe148b8e10 RBP: 00007ffe148b8e10 R08: 00000000ffffffff R09: 00007ffe148b8be0 R10: 000055555603e853 R11: 0000000000000246 R12: 00007f63f132ee80 R13: 00007ffe148b9ed0 R14: 000055555603e810 R15: 00007ffe148b9f10 Showing all locks held in the system: 1 lock held by khungtaskd/27: #0: ffffffff8b97d3a0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6446 1 lock held by kworker/u4:5/1206: #0: ffff8880b9d31ad8 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested kernel/sched/core.c:474 [inline] #0: ffff8880b9d31ad8 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock kernel/sched/sched.h:1317 [inline] #0: ffff8880b9d31ad8 (&rq->__lock){-.-.}-{2:2}, at: rq_lock kernel/sched/sched.h:1620 [inline] #0: ffff8880b9d31ad8 (&rq->__lock){-.-.}-{2:2}, at: __schedule+0x236/0x26f0 kernel/sched/core.c:6201 1 lock held by in:imklog/6235: #0: ffff888020f9a6b0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:990 2 locks held by syz-executor.2/9629: #0: ffff88808faa5990 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: inode_lock_shared include/linux/fs.h:796 [inline] #0: ffff88808faa5990 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: lookup_slow fs/namei.c:1673 [inline] #0: ffff88808faa5990 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: walk_component+0x400/0x6a0 fs/namei.c:1970 #1: ffff88808faa5df8 (&fi->mutex){+.+.}-{3:3}, at: fuse_lock_inode+0xce/0x100 fs/fuse/inode.c:427 2 locks held by syz-executor.2/20085: #0: ffff88808f849350 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: inode_lock_shared include/linux/fs.h:796 [inline] #0: ffff88808f849350 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: lookup_slow fs/namei.c:1673 [inline] #0: ffff88808f849350 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: walk_component+0x400/0x6a0 fs/namei.c:1970 #1: ffff88808f8497b8 (&fi->mutex){+.+.}-{3:3}, at: fuse_lock_inode+0xce/0x100 fs/fuse/inode.c:427 2 locks held by syz-executor.2/20909: #0: ffff88808faa5990 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: inode_lock_shared include/linux/fs.h:796 [inline] #0: ffff88808faa5990 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: lookup_slow fs/namei.c:1673 [inline] #0: ffff88808faa5990 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: walk_component+0x400/0x6a0 fs/namei.c:1970 #1: ffff88808faa5df8 (&fi->mutex){+.+.}-{3:3}, at: fuse_lock_inode+0xce/0x100 fs/fuse/inode.c:427 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 27 Comm: khungtaskd Not tainted 5.15.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 nmi_cpu_backtrace.cold+0x47/0x144 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x1ae/0x220 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:210 [inline] watchdog+0xc1d/0xf50 kernel/hung_task.c:295 kthread+0x3e5/0x4d0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 6236 Comm: rs:main Q:Reg Not tainted 5.15.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:lockdep_enabled kernel/locking/lockdep.c:91 [inline] RIP: 0010:lock_is_held_type+0x3a/0x140 kernel/locking/lockdep.c:5661 Code: 48 83 ec 08 8b 0d 52 09 39 04 85 c9 0f 84 d7 00 00 00 65 8b 05 97 aa cc 76 85 c0 0f 85 c8 00 00 00 65 4c 8b 24 25 40 f0 01 00 <41> 8b 94 24 f4 09 00 00 85 d2 0f 85 af 00 00 00 48 89 fd 41 89 f6 RSP: 0018:ffffc9000cbb7da0 EFLAGS: 00000046 RAX: 0000000000000000 RBX: 1ffff92001976fc0 RCX: 0000000000000001 RDX: 1ffffffff1730c2e RSI: 00000000ffffffff RDI: ffffffff8b97d2e0 RBP: 0000000000000001 R08: 0000000000000000 R09: ffff8880b9c32a8b R10: ffffed1017386551 R11: 0000000000000000 R12: ffff888078dee300 R13: 00000000ffffffff R14: ffff888078dee9c0 R15: 0000000000000000 FS: 00007fc48f88d700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007efc3f04f000 CR3: 0000000020ae5000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lock_is_held include/linux/lockdep.h:283 [inline] rcu_read_lock_sched_held+0x3a/0x70 kernel/rcu/update.c:125 trace_lock_acquire include/trace/events/lock.h:13 [inline] lock_acquire+0x442/0x510 kernel/locking/lockdep.c:5596 do_write_seqcount_begin_nested include/linux/seqlock.h:520 [inline] do_write_seqcount_begin include/linux/seqlock.h:545 [inline] vtime_user_exit+0xac/0x210 kernel/sched/cputime.c:719 __context_tracking_exit+0xb8/0xe0 kernel/context_tracking.c:160 user_exit_irqoff include/linux/context_tracking.h:47 [inline] __enter_from_user_mode kernel/entry/common.c:22 [inline] syscall_enter_from_user_mode+0x4c/0x70 kernel/entry/common.c:104 do_syscall_64+0x16/0xb0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7fc4922d11cd Code: c2 20 00 00 75 10 b8 01 00 00 00 0f 05 48 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 ae fc ff ff 48 89 04 24 b8 01 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 f7 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01 RSP: 002b:00007fc48f88c590 EFLAGS: 00000293 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007fc484027810 RCX: 00007fc4922d11cd RDX: 00000000000004c8 RSI: 00007fc484027810 RDI: 000000000000000a RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000293 R12: 00007fc484027590 R13: 00007fc48f88c5b0 R14: 00005640e06347c0 R15: 00000000000004c8 ---------------- Code disassembly (best guess): 0: 48 83 ec 08 sub $0x8,%rsp 4: 8b 0d 52 09 39 04 mov 0x4390952(%rip),%ecx # 0x439095c a: 85 c9 test %ecx,%ecx c: 0f 84 d7 00 00 00 je 0xe9 12: 65 8b 05 97 aa cc 76 mov %gs:0x76ccaa97(%rip),%eax # 0x76ccaab0 19: 85 c0 test %eax,%eax 1b: 0f 85 c8 00 00 00 jne 0xe9 21: 65 4c 8b 24 25 40 f0 mov %gs:0x1f040,%r12 28: 01 00 * 2a: 41 8b 94 24 f4 09 00 mov 0x9f4(%r12),%edx <-- trapping instruction 31: 00 32: 85 d2 test %edx,%edx 34: 0f 85 af 00 00 00 jne 0xe9 3a: 48 89 fd mov %rdi,%rbp 3d: 41 89 f6 mov %esi,%r14d