INFO: task syz-executor.5:19085 blocked for more than 143 seconds. Not tainted 5.11.0-rc4-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.5 state:D stack:29376 pid:19085 ppid: 8536 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:4313 [inline] __schedule+0x90c/0x21a0 kernel/sched/core.c:5064 schedule+0xcf/0x270 kernel/sched/core.c:5143 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] open_last_lookups fs/namei.c:3177 [inline] path_openat+0x907/0x2730 fs/namei.c:3368 do_filp_open+0x17e/0x3c0 fs/namei.c:3398 do_sys_openat2+0x16d/0x420 fs/open.c:1172 do_sys_open fs/open.c:1188 [inline] __do_sys_open fs/open.c:1196 [inline] __se_sys_open fs/open.c:1192 [inline] __x64_sys_open+0x119/0x1c0 fs/open.c:1192 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45e219 RSP: 002b:00007f67ee018c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045e219 RDX: 0000000000000000 RSI: 00000000000200c0 RDI: 0000000020000040 RBP: 000000000119c068 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000119c034 R13: 00007ffd8c0d339f R14: 00007f67ee0199c0 R15: 000000000119c034 Showing all locks held in the system: 1 lock held by khungtaskd/1648: #0: ffffffff8b373920 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6254 1 lock held by in:imklog/8416: #0: ffff8880117e60f0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:947 5 locks held by syz-executor.5/19074: 2 locks held by syz-executor.5/19085: #0: ffff888076668460 (sb_writers#17){.+.+}-{0:0}, at: open_last_lookups fs/namei.c:3167 [inline] #0: ffff888076668460 (sb_writers#17){.+.+}-{0:0}, at: path_openat+0x2462/0x2730 fs/namei.c:3368 #1: ffff8880302a44d0 (&type->i_mutex_dir_key#8){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:773 [inline] #1: ffff8880302a44d0 (&type->i_mutex_dir_key#8){+.+.}-{3:3}, at: open_last_lookups fs/namei.c:3177 [inline] #1: ffff8880302a44d0 (&type->i_mutex_dir_key#8){+.+.}-{3:3}, at: path_openat+0x907/0x2730 fs/namei.c:3368 1 lock held by syz-executor.5/19119: #0: ffff8880302a44d0 (&type->i_mutex_dir_key#8){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:773 [inline] #0: ffff8880302a44d0 (&type->i_mutex_dir_key#8){+.+.}-{3:3}, at: lock_mount+0x8a/0x2e0 fs/namespace.c:2198 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1648 Comm: khungtaskd Not tainted 5.11.0-rc4-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:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:209 [inline] watchdog+0xd43/0xfa0 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 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 19074 Comm: syz-executor.5 Not tainted 5.11.0-rc4-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:rcu_lockdep_current_cpu_online kernel/rcu/tree.c:1161 [inline] RIP: 0010:rcu_lockdep_current_cpu_online+0x5c/0x150 kernel/rcu/tree.c:1152 Code: 03 00 83 f8 07 89 c5 0f 87 f5 00 00 00 48 8d 3c ed c0 c6 e6 8a 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 <0f> 85 ad 00 00 00 48 03 1c ed c0 c6 e6 8a 48 b8 00 00 00 00 00 fc RSP: 0018:ffffc90001c1f7f0 EFLAGS: 00000246 RAX: dffffc0000000000 RBX: 0000000000035a80 RCX: ffffffff8158cce8 RDX: 1ffffffff15cd8d8 RSI: 0000000000000004 RDI: ffffffff8ae6c6c0 RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff8d037d0f R10: fffffbfff1a06fa1 R11: 0000000000000001 R12: 0000000000000001 R13: ffff8880302a4420 R14: 0000000000000000 R15: 0000000000000000 FS: 00007f67ee03a700(0000) GS:ffff8880b9e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f24d6c84000 CR3: 0000000017bdb000 CR4: 0000000000350ef0 Call Trace: rcu_read_lock_held_common kernel/rcu/update.c:110 [inline] rcu_read_lock_held_common kernel/rcu/update.c:100 [inline] rcu_read_lock_sched_held+0x25/0x70 kernel/rcu/update.c:121 trace_lock_acquire include/trace/events/lock.h:13 [inline] lock_acquire+0x5c9/0x740 kernel/locking/lockdep.c:5408 __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] find_inode+0x109/0x220 fs/inode.c:826 ilookup5_nowait fs/inode.c:1334 [inline] ilookup5 fs/inode.c:1363 [inline] iget5_locked+0xbd/0x2d0 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_hash+0x117/0x180 fs/namei.c:1445 filename_create+0x186/0x490 fs/namei.c:3470 user_path_create fs/namei.c:3527 [inline] do_mkdirat+0xa0/0x2d0 fs/namei.c:3667 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45e219 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:00007f67ee039c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000053 RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 000000000045e219 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000000 RBP: 000000000119bfb8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000119bf8c R13: 00007ffd8c0d339f R14: 00007f67ee03a9c0 R15: 000000000119bf8c