INFO: task syz-executor.4:8484 blocked for more than 143 seconds.
      Not tainted 5.10.0-rc1-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.4  state:D stack:24016 pid: 8484 ppid:     1 flags:0x00000004
Call Trace:
 context_switch kernel/sched/core.c:3774 [inline]
 __schedule+0x893/0x2130 kernel/sched/core.c:4523
 schedule+0xcf/0x270 kernel/sched/core.c:4601
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4660
 __mutex_lock_common kernel/locking/mutex.c:1033 [inline]
 __mutex_lock+0x3e2/0x10e0 kernel/locking/mutex.c:1103
 __blkdev_get+0x457/0x1870 fs/block_dev.c:1479
 blkdev_get+0xd1/0x240 fs/block_dev.c:1634
 blkdev_open+0x21d/0x2b0 fs/block_dev.c:1751
 do_dentry_open+0x4b9/0x11b0 fs/open.c:817
 do_open fs/namei.c:3252 [inline]
 path_openat+0x1b9a/0x2730 fs/namei.c:3369
 do_filp_open+0x17e/0x3c0 fs/namei.c:3396
 do_sys_openat2+0x16d/0x420 fs/open.c:1168
 do_sys_open fs/open.c:1184 [inline]
 __do_sys_open fs/open.c:1192 [inline]
 __se_sys_open fs/open.c:1188 [inline]
 __x64_sys_open+0x119/0x1c0 fs/open.c:1188
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x4179b1
Code: Unable to access opcode bytes at RIP 0x417987.
RSP: 002b:00007fff5f071460 EFLAGS: 00000293 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 0000000000350cc1 RCX: 00000000004179b1
RDX: 00007fff5f0714fa RSI: 0000000000000002 RDI: 00007fff5f0714f0
RBP: 0000000000001ffc R08: 0000000000000000 R09: 000000000000000a
R10: 0000000000000075 R11: 0000000000000293 R12: 0000000000000000
R13: 00007fff5f0714a0 R14: 0000000000350c28 R15: 00007fff5f0714b0

Showing all locks held in the system:
2 locks held by kworker/u4:1/21:
1 lock held by khungtaskd/1644:
 #0: ffffffff8b337060 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6259
1 lock held by in:imklog/8155:
 #0: ffff8880143fa870 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:932
1 lock held by syz-executor.4/8484:
 #0: ffff8880335b7740 (&bdev->bd_mutex){+.+.}-{3:3}, at: __blkdev_get+0x457/0x1870 fs/block_dev.c:1479
1 lock held by systemd-udevd/11277:
1 lock held by systemd-udevd/11290:
2 locks held by systemd-udevd/11344:

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

NMI backtrace for cpu 1
CPU: 1 PID: 1644 Comm: khungtaskd Not tainted 5.10.0-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:77 [inline]
 dump_stack+0x107/0x163 lib/dump_stack.c:118
 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:295
 kthread+0x3af/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: 4876 Comm: systemd-journal Not tainted 5.10.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0033:0x7f39881959e3
Code: 8d 44 24 23 41 83 e4 01 48 89 44 24 08 48 8d 44 24 24 48 89 44 24 10 eb 2f 0f 1f 40 00 66 2e 0f 1f 84 00 00 00 00 00 88 45 00 <48> 83 c3 01 48 83 c5 01 49 39 de 0f 86 4c 01 00 00 4d 89 f5 c6 44
RSP: 002b:00007ffe535a5440 EFLAGS: 00000212
RAX: 0000000000000064 RBX: 00007ffe535a5d62 RCX: 3d4547415353454d
RDX: 0000000000000008 RSI: 3d4547415353454d RDI: 000055da34b9b8a0
RBP: 000055da34b9b8c8 R08: 00007ffe535a54e8 R09: 0000000000000060
R10: 0000000000000069 R11: 00000000ffffffff R12: 0000000000000001
R13: 0000000000000025 R14: 00007ffe535a5d87 R15: 000055da34b9b8a0
FS:  00007f39884b68c0 GS:  0000000000000000