INFO: task syz-executor.4:10693 blocked for more than 143 seconds. Not tainted 5.11.0-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.4 state:D stack:27120 pid:10693 ppid: 8368 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4324 [inline] __schedule+0x999/0xe70 kernel/sched/core.c:5075 schedule+0x14b/0x200 kernel/sched/core.c:5154 rwsem_down_write_slowpath+0xd69/0x1370 kernel/locking/rwsem.c:1106 __down_write_common kernel/locking/rwsem.c:1261 [inline] __down_write kernel/locking/rwsem.c:1270 [inline] down_write+0x117/0x120 kernel/locking/rwsem.c:1407 inode_lock include/linux/fs.h:775 [inline] lock_mount+0x6a/0x2f0 fs/namespace.c:2229 do_new_mount_fc fs/namespace.c:2859 [inline] do_new_mount fs/namespace.c:2918 [inline] path_mount+0x20b2/0x29a0 fs/namespace.c:3246 do_mount fs/namespace.c:3259 [inline] __do_sys_mount fs/namespace.c:3467 [inline] __se_sys_mount+0x28c/0x320 fs/namespace.c:3444 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x465ef9 RSP: 002b:00007f783b123188 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 0000000000465ef9 RDX: 0000000020002100 RSI: 00000000200042c0 RDI: 0000000000000000 RBP: 00000000004bcd1c R08: 0000000020000300 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60 R13: 00007ffeab33170f R14: 00007f783b123300 R15: 0000000000022000 Showing all locks held in the system: 3 locks held by kworker/u4:7/252: #0: ffff8880b9c34c58 (&rq->lock){-.-.}-{2:2}, at: rq_lock kernel/sched/sched.h:1321 [inline] #0: ffff8880b9c34c58 (&rq->lock){-.-.}-{2:2}, at: __schedule+0xd8/0xe70 kernel/sched/core.c:4992 #1: ffffc90001acfd78 ((work_completion)(&(&bat_priv->nc.work)->work)){+.+.}-{0:0}, at: process_one_work+0x733/0xfd0 kernel/workqueue.c:2250 #2: ffff8880b9c24018 (&base->lock){..-.}-{2:2}, at: lock_timer_base+0x12a/0x270 kernel/time/timer.c:944 1 lock held by khungtaskd/1651: #0: ffffffff8c710000 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30 arch/x86/pci/mmconfig_64.c:151 1 lock held by in:imklog/8054: #0: ffff888013a2d770 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x24e/0x2f0 fs/file.c:961 1 lock held by syz-executor.4/10693: #0: ffff8880331e0150 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:775 [inline] #0: ffff8880331e0150 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: lock_mount+0x6a/0x2f0 fs/namespace.c:2229 2 locks held by syz-executor.4/10696: ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1651 Comm: khungtaskd Not tainted 5.11.0-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+0x125/0x19e lib/dump_stack.c:120 nmi_cpu_backtrace+0x16c/0x190 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x191/0x2f0 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+0xce9/0xd30 kernel/hung_task.c:294 kthread+0x39a/0x3c0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 10696 Comm: syz-executor.4 Not tainted 5.11.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:match_held_lock+0x84/0x190 kernel/locking/lockdep.c:4990 Code: 06 48 ba ab aa aa aa aa aa aa aa 48 0f af d0 48 39 ca 74 02 31 db 65 48 8b 04 25 28 00 00 00 48 3b 44 24 08 0f 85 fb 00 00 00 <89> d8 48 83 c4 10 5b c3 48 8b 0e 48 85 c9 74 da 83 3d 35 8f aa 06 RSP: 0018:ffffc900025ef2e0 EFLAGS: 00000046 RAX: f2763933152ba600 RBX: 0000000000000000 RCX: 0000000080000002 RDX: 0000000000000000 RSI: ffffffff8c70ff60 RDI: ffff888021f15cc8 RBP: ffff888021f15cc8 R08: dffffc0000000000 R09: fffffbfff1b6a5ce R10: fffffbfff1b6a5ce R11: 0000000000000000 R12: 0000000000000246 R13: ffff888021f15340 R14: 00000000ffffffff R15: ffffffff8c70ff60 FS: 00007f783b102700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fbb0b173000 CR3: 000000007a5a8000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __lock_is_held kernel/locking/lockdep.c:5253 [inline] lock_is_held_type+0xa1/0x160 kernel/locking/lockdep.c:5549 lock_is_held include/linux/lockdep.h:278 [inline] rcu_read_lock_sched_held+0x41/0xb0 kernel/rcu/update.c:125 trace_lock_release+0x61/0x140 include/trace/events/lock.h:58 lock_release+0x27/0x6b0 kernel/locking/lockdep.c:5521 __raw_spin_unlock include/linux/spinlock_api_smp.h:150 [inline] _raw_spin_unlock+0x12/0x40 kernel/locking/spinlock.c:183 spin_unlock include/linux/spinlock.h:394 [inline] ilookup5_nowait fs/inode.c:1335 [inline] ilookup5+0xac/0x1f0 fs/inode.c:1363 iget5_locked+0x30/0x3d0 fs/inode.c:1144 fuse_iget+0x343/0x6d0 fs/fuse/inode.c:342 fuse_lookup_name+0x5c3/0x750 fs/fuse/dir.c:439 fuse_lookup+0xe5/0x470 fs/fuse/dir.c:469 __lookup_slow+0x240/0x370 fs/namei.c:1626 lookup_slow fs/namei.c:1643 [inline] walk_component+0x455/0x6b0 fs/namei.c:1939 lookup_last fs/namei.c:2396 [inline] path_lookupat+0x19d/0x9b0 fs/namei.c:2420 filename_lookup+0x1b0/0x5e0 fs/namei.c:2453 unix_find_other+0x83/0x870 net/unix/af_unix.c:935 unix_dgram_sendmsg+0xd3d/0x2990 net/unix/af_unix.c:1696 sock_sendmsg_nosec net/socket.c:654 [inline] sock_sendmsg net/socket.c:674 [inline] ____sys_sendmsg+0x519/0x800 net/socket.c:2350 ___sys_sendmsg net/socket.c:2404 [inline] __sys_sendmmsg+0x453/0x680 net/socket.c:2494 __do_sys_sendmmsg net/socket.c:2523 [inline] __se_sys_sendmmsg net/socket.c:2520 [inline] __x64_sys_sendmmsg+0x9c/0xb0 net/socket.c:2520 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x465ef9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f783b102188 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 RAX: ffffffffffffffda RBX: 000000000056c008 RCX: 0000000000465ef9 RDX: 0000000000000002 RSI: 0000000020008600 RDI: 0000000000000005 RBP: 00000000004bcd1c R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056c008 R13: 00007ffeab33170f R14: 00007f783b102300 R15: 0000000000022000