INFO: task syz-executor.2:8518 blocked for more than 143 seconds. Not tainted 5.10.0-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.2 state:D stack:24024 pid: 8518 ppid: 1 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4327 [inline] __schedule+0x8eb/0x21b0 kernel/sched/core.c:5078 schedule+0xcf/0x270 kernel/sched/core.c:5157 rwsem_down_write_slowpath+0x809/0x1220 kernel/locking/rwsem.c:1106 __down_write_common kernel/locking/rwsem.c:1261 [inline] __down_write_common kernel/locking/rwsem.c:1258 [inline] __down_write kernel/locking/rwsem.c:1270 [inline] down_write+0x132/0x150 kernel/locking/rwsem.c:1407 fuse_mount_remove fs/fuse/inode.c:1531 [inline] fuse_kill_sb_anon+0x81/0x290 fs/fuse/inode.c:1566 deactivate_locked_super+0x94/0x160 fs/super.c:335 deactivate_super+0xad/0xd0 fs/super.c:366 cleanup_mnt+0x3a3/0x530 fs/namespace.c:1118 task_work_run+0xdd/0x190 kernel/task_work.c:168 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop kernel/entry/common.c:174 [inline] exit_to_user_mode_prepare+0x1f0/0x200 kernel/entry/common.c:201 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline] syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:302 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x460b77 RSP: 002b:00007ffe71fa4e38 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000460b77 RDX: 00000000004032c8 RSI: 0000000000000002 RDI: 00007ffe71fa4ee0 RBP: 000000000000018b R08: 0000000000000000 R09: 000000000000000b R10: 0000000000000005 R11: 0000000000000246 R12: 00007ffe71fa5f70 R13: 0000000001bcfa60 R14: 0000000000000000 R15: 00000000000758bf Showing all locks held in the system: 1 lock held by khungtaskd/1646: #0: ffffffff8b78e020 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x28c kernel/locking/lockdep.c:6254 1 lock held by systemd-journal/4877: 1 lock held by in:imklog/8388: #0: ffff88801394f8b0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:947 2 locks held by syz-executor.2/8518: #0: ffff8880290800e0 (&type->s_umount_key#64){+.+.}-{3:3}, at: deactivate_super+0xa5/0xd0 fs/super.c:365 #1: ffff8880198a5b38 (&fc->killsb){++++}-{3:3}, at: fuse_mount_remove fs/fuse/inode.c:1531 [inline] #1: ffff8880198a5b38 (&fc->killsb){++++}-{3:3}, at: fuse_kill_sb_anon+0x81/0x290 fs/fuse/inode.c:1566 1 lock held by syz-executor.2/12930: #0: ffff8880198a5b38 (&fc->killsb){++++}-{3:3}, at: fuse_notify_retrieve fs/fuse/dev.c:1743 [inline] #0: ffff8880198a5b38 (&fc->killsb){++++}-{3:3}, at: fuse_notify fs/fuse/dev.c:1781 [inline] #0: ffff8880198a5b38 (&fc->killsb){++++}-{3:3}, at: fuse_dev_do_write+0xfdd/0x2c10 fs/fuse/dev.c:1859 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1646 Comm: khungtaskd Not tainted 5.10.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x107/0x163 lib/dump_stack.c:120 nmi_cpu_backtrace.cold+0x3c/0xef lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x1b3/0x230 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:209 [inline] watchdog+0xe36/0x10b0 kernel/hung_task.c:294 kthread+0x3b1/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 8740 Comm: kworker/u4:3 Not tainted 5.10.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: phy10 ieee80211_iface_work RIP: 0010:debug_spin_unlock kernel/locking/spinlock_debug.c:99 [inline] RIP: 0010:do_raw_spin_unlock+0x85/0x230 kernel/locking/spinlock_debug.c:138 Code: ff df 48 c1 ea 03 0f b6 14 02 48 89 e8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 6b 01 00 00 8b 45 00 85 c0 0f 84 f4 00 00 00 <4c> 8d 6d 10 48 b8 00 00 00 00 00 fc ff df 4c 89 ea 48 c1 ea 03 80 RSP: 0018:ffffc900023bfcf0 EFLAGS: 00000002 RAX: 0000000000000001 RBX: 0000000000000100 RCX: ffffffff81587040 RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff888010871800 RBP: ffff888010871800 R08: 0000000000000000 R09: ffff888010871803 R10: ffffed100210e300 R11: 0000000000000000 R12: 0000000000000001 R13: ffff8880794395c0 R14: ffff88801f01ac00 R15: ffff888010871800 FS: 0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f6fe5024000 CR3: 00000000136b5000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:167 [inline] _raw_spin_unlock_irq+0x1a/0x40 kernel/locking/spinlock.c:199 process_one_work+0x883/0x1630 kernel/workqueue.c:2248 worker_thread+0x64c/0x1120 kernel/workqueue.c:2421 kthread+0x3b1/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296