INFO: task syz-executor.0:15068 blocked for more than 143 seconds.
      Not tainted 5.12.0-rc1-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.0  state:D stack:27832 pid:15068 ppid:  8434 flags:0x20004004
Call Trace:
 context_switch kernel/sched/core.c:4324 [inline]
 __schedule+0x90c/0x21a0 kernel/sched/core.c:5075
 schedule+0xcf/0x270 kernel/sched/core.c:5154
 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+0x137/0x150 kernel/locking/rwsem.c:1407
 inode_lock include/linux/fs.h:775 [inline]
 lock_mount+0x8a/0x2e0 fs/namespace.c:2216
 do_new_mount_fc fs/namespace.c:2846 [inline]
 do_new_mount fs/namespace.c:2905 [inline]
 path_mount+0x14d6/0x1f90 fs/namespace.c:3233
 do_mount fs/namespace.c:3246 [inline]
 __do_sys_mount fs/namespace.c:3454 [inline]
 __se_sys_mount fs/namespace.c:3431 [inline]
 __ia32_sys_mount+0x27e/0x300 fs/namespace.c:3431
 do_syscall_32_irqs_on arch/x86/entry/common.c:77 [inline]
 __do_fast_syscall_32+0x56/0x80 arch/x86/entry/common.c:139
 do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:164
 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c
RIP: 0023:0xf7f75549
RSP: 002b:00000000f556f5fc EFLAGS: 00000296 ORIG_RAX: 0000000000000015
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000200020c0
RDX: 0000000020002100 RSI: 0000000000000000 RDI: 0000000020002140
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000

Showing all locks held in the system:
1 lock held by khungtaskd/1665:
 #0: ffffffff8bf741a0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6327
1 lock held by in:imklog/8106:
 #0: ffff8880214df270 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:961
1 lock held by syz-executor.0/15068:
 #0: ffff888066cd0810 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:775 [inline]
 #0: ffff888066cd0810 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: lock_mount+0x8a/0x2e0 fs/namespace.c:2216
2 locks held by syz-executor.0/15076:

=============================================

NMI backtrace for cpu 0
CPU: 0 PID: 1665 Comm: khungtaskd Not tainted 5.12.0-rc1-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+0xfa/0x151 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+0xd48/0xfb0 kernel/hung_task.c:294
 kthread+0x3b1/0x4a0 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 19 Comm: kworker/1:0 Not tainted 5.12.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue:  0x0 (events)
RIP: 0010:put_prev_entity+0x0/0x5e0 kernel/sched/fair.c:4497
Code: 02 84 c0 74 04 3c 03 7e 18 8b 85 c0 01 00 00 85 c0 74 c2 b8 01 00 00 00 5d c3 e8 8b cf 64 00 eb a5 e8 74 cf 64 00 eb e1 66 90 <48> b8 00 00 00 00 00 fc ff df 41 57 41 56 41 55 49 89 fd 41 54 4c
RSP: 0018:ffffc90000d97ce8 EFLAGS: 00000046
RAX: ffff8880115c0210 RBX: dffffc0000000000 RCX: 1ffff110022c2aaa
RDX: dffffc0000000000 RSI: ffff888011615400 RDI: ffff8880b9d35240
RBP: 0000000000000000 R08: ffff8880b9d35240 R09: ffffffff8dc62d0f
R10: fffffbfff1b8c5a1 R11: 0000000000000001 R12: ffff888011615400
R13: ffff8880b9d35240 R14: ffffed10173a6a4a R15: ffff8880115c00c0
FS:  0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f7546bb4000 CR3: 0000000011c0f000 CR4: 00000000001506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 pick_next_task_fair+0x670/0xce0 kernel/sched/fair.c:7091
 pick_next_task kernel/sched/core.c:4891 [inline]
 __schedule+0x36b/0x21a0 kernel/sched/core.c:5042
 schedule+0xcf/0x270 kernel/sched/core.c:5154
 worker_thread+0x14c/0x1120 kernel/workqueue.c:2442
 kthread+0x3b1/0x4a0 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294