INFO: task syz-executor.3:11054 can't die for more than 143 seconds. task:syz-executor.3 state:R running task stack:27096 pid:11054 ppid: 8469 flags:0x00004006 Call Trace: context_switch kernel/sched/core.c:4327 [inline] __schedule+0x8cd/0x2150 kernel/sched/core.c:5078 preempt_schedule_common+0x45/0xc0 kernel/sched/core.c:5238 preempt_schedule_thunk+0x16/0x18 arch/x86/entry/thunk_64.S:40 __raw_spin_unlock include/linux/spinlock_api_smp.h:152 [inline] _raw_spin_unlock+0x36/0x40 kernel/locking/spinlock.c:183 spin_unlock include/linux/spinlock.h:394 [inline] ilookup5_nowait+0x7e/0xb0 fs/inode.c:1335 ilookup5 fs/inode.c:1363 [inline] iget5_locked+0x41/0x220 fs/inode.c:1144 fuse_iget+0x271/0x610 fs/fuse/inode.c:342 fuse_lookup_name+0x447/0x630 fs/fuse/dir.c:439 fuse_lookup.part.0+0xdf/0x390 fs/fuse/dir.c:469 fuse_lookup+0x70/0x90 fs/fuse/dir.c:465 __lookup_slow+0x24c/0x480 fs/namei.c:1544 lookup_slow fs/namei.c:1561 [inline] walk_component+0x418/0x6a0 fs/namei.c:1861 lookup_last fs/namei.c:2312 [inline] path_lookupat+0x1ba/0x830 fs/namei.c:2336 filename_lookup+0x19f/0x560 fs/namei.c:2369 user_path_at include/linux/namei.h:59 [inline] vfs_statx+0x142/0x390 fs/stat.c:185 vfs_fstatat fs/stat.c:207 [inline] vfs_stat include/linux/fs.h:3118 [inline] __do_sys_newstat+0x91/0x110 fs/stat.c:349 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45e299 RSP: 002b:00007f703caaac68 EFLAGS: 00000246 ORIG_RAX: 0000000000000004 RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 000000000045e299 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000bc0 RBP: 000000000119bfb8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000119bf8c R13: 00007ffd4b894e8f R14: 00007f703caab9c0 R15: 000000000119bf8c INFO: task syz-executor.3:11060 can't die for more than 143 seconds. task:syz-executor.3 state:D stack:27224 pid:11060 ppid: 8469 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4327 [inline] __schedule+0x8cd/0x2150 kernel/sched/core.c:5078 schedule+0xcf/0x270 kernel/sched/core.c:5157 rwsem_down_write_slowpath+0x7e5/0x1200 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 inode_lock include/linux/fs.h:773 [inline] lock_mount+0x8a/0x2e0 fs/namespace.c:2214 do_new_mount_fc fs/namespace.c:2842 [inline] do_new_mount fs/namespace.c:2901 [inline] path_mount+0x1678/0x1e70 fs/namespace.c:3230 do_mount fs/namespace.c:3243 [inline] __do_sys_mount fs/namespace.c:3451 [inline] __se_sys_mount fs/namespace.c:3428 [inline] __x64_sys_mount+0x27f/0x300 fs/namespace.c:3428 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45e299 RSP: 002b:00007f703ca89c68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 000000000045e299 RDX: 0000000020002100 RSI: 00000000200042c0 RDI: 0000000000000000 RBP: 000000000119c078 R08: 0000000020002140 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000119c034 R13: 00007ffd4b894e8f R14: 00007f703ca8a9c0 R15: 000000000119c034 INFO: task syz-executor.3:11060 blocked for more than 144 seconds. Not tainted 5.10.0-next-20201223-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.3 state:D stack:27224 pid:11060 ppid: 8469 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4327 [inline] __schedule+0x8cd/0x2150 kernel/sched/core.c:5078 schedule+0xcf/0x270 kernel/sched/core.c:5157 rwsem_down_write_slowpath+0x7e5/0x1200 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 inode_lock include/linux/fs.h:773 [inline] lock_mount+0x8a/0x2e0 fs/namespace.c:2214 do_new_mount_fc fs/namespace.c:2842 [inline] do_new_mount fs/namespace.c:2901 [inline] path_mount+0x1678/0x1e70 fs/namespace.c:3230 do_mount fs/namespace.c:3243 [inline] __do_sys_mount fs/namespace.c:3451 [inline] __se_sys_mount fs/namespace.c:3428 [inline] __x64_sys_mount+0x27f/0x300 fs/namespace.c:3428 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45e299 RSP: 002b:00007f703ca89c68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 000000000045e299 RDX: 0000000020002100 RSI: 00000000200042c0 RDI: 0000000000000000 RBP: 000000000119c078 R08: 0000000020002140 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000119c034 R13: 00007ffd4b894e8f R14: 00007f703ca8a9c0 R15: 000000000119c034 Showing all locks held in the system: 1 lock held by khungtaskd/1661: #0: ffffffff8b363660 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6254 1 lock held by in:imklog/8165: #0: ffff88801ba91270 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:949 2 locks held by syz-executor.3/11054: 1 lock held by syz-executor.3/11060: #0: ffff8880770c0150 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:773 [inline] #0: ffff8880770c0150 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: lock_mount+0x8a/0x2e0 fs/namespace.c:2214 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1661 Comm: khungtaskd Not tainted 5.10.0-next-20201223-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+0x44/0xd7 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x1b3/0x230 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:147 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:253 [inline] watchdog+0xd89/0xf30 kernel/hung_task.c:338 kthread+0x3b1/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 11054 Comm: syz-executor.3 Not tainted 5.10.0-next-20201223-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__lock_acquire+0xd47/0x5500 kernel/locking/lockdep.c:4836 Code: 00 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 0f b6 04 02 84 c0 74 0d 3c 03 7f 09 48 8b 3c 24 e8 cf e7 5c 00 8b 85 88 09 00 00 <83> c0 01 83 f8 2f 89 85 88 09 00 00 0f 87 a7 0b 00 00 3b 05 41 db RSP: 0018:ffffc90001ddf280 EFLAGS: 00000046 RAX: 0000000000000002 RBX: ffffffff8e6414e0 RCX: 0000000000000001 RDX: 1ffff11004020831 RSI: 0000000000000008 RDI: ffffffff8e6414f8 RBP: ffff888020103800 R08: 0000000000000000 R09: ffffffff8ebdd7f7 R10: fffffbfff1d7bafe R11: 0000000000000000 R12: ffff8880201041e0 R13: dffffc0000000000 R14: 0290a81d74a2d975 R15: 0000000000000000 FS: 00007f703caab700(0000) GS:ffff8880b9e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fbe20789008 CR3: 0000000029459000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lock_acquire kernel/locking/lockdep.c:5437 [inline] lock_acquire+0x29d/0x740 kernel/locking/lockdep.c:5402 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:151 spin_lock include/linux/spinlock.h:354 [inline] ilookup5_nowait+0x5e/0xb0 fs/inode.c:1333 ilookup5 fs/inode.c:1363 [inline] iget5_locked+0x41/0x220 fs/inode.c:1144 fuse_iget+0x271/0x610 fs/fuse/inode.c:342 fuse_lookup_name+0x447/0x630 fs/fuse/dir.c:439 fuse_lookup.part.0+0xdf/0x390 fs/fuse/dir.c:469 fuse_lookup+0x70/0x90 fs/fuse/dir.c:465 __lookup_slow+0x24c/0x480 fs/namei.c:1544 lookup_slow fs/namei.c:1561 [inline] walk_component+0x418/0x6a0 fs/namei.c:1861 lookup_last fs/namei.c:2312 [inline] path_lookupat+0x1ba/0x830 fs/namei.c:2336 filename_lookup+0x19f/0x560 fs/namei.c:2369 user_path_at include/linux/namei.h:59 [inline] vfs_statx+0x142/0x390 fs/stat.c:185 vfs_fstatat fs/stat.c:207 [inline] vfs_stat include/linux/fs.h:3118 [inline] __do_sys_newstat+0x91/0x110 fs/stat.c:349 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45e299 Code: 0d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 db b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f703caaac68 EFLAGS: 00000246 ORIG_RAX: 0000000000000004 RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 000000000045e299 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000bc0 RBP: 000000000119bfb8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000119bf8c R13: 00007ffd4b894e8f R14: 00007f703caab9c0 R15: 000000000119bf8c