INFO: task syz-executor238:6839 blocked for more than 143 seconds.
      Not tainted 5.9.0-rc3-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor238 state:D stack:27968 pid: 6839 ppid:  6828 flags:0x00004004
Call Trace:
 context_switch kernel/sched/core.c:3778 [inline]
 __schedule+0x9b9/0xd20 kernel/sched/core.c:4527

Showing all locks held in the system:
1 lock held by khungtaskd/1169:
 #0: ffffffff894fe510 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30 arch/x86/pci/mmconfig_64.c:151
1 lock held by in:imklog/6497:
 #0: ffff88809ebce670 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x253/0x2f0 fs/file.c:930
1 lock held by syz-executor238/6839:
 #0: ffff88808b3fe300 (&bdev->bd_mutex){+.+.}-{3:3}, at: __blkdev_get+0x2dd/0x1700 fs/block_dev.c:1492

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

NMI backtrace for cpu 0
CPU: 0 PID: 1169 Comm: khungtaskd Not tainted 5.9.0-rc3-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+0x1d6/0x29e lib/dump_stack.c:118
 nmi_cpu_backtrace+0x9f/0x180 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x16a/0x280 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+0xd65/0xdb0 kernel/hung_task.c:295
 kthread+0x37e/0x3a0 drivers/block/aoe/aoecmd.c:1234
 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: 3895 Comm: systemd-journal Not tainted 5.9.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:arch_atomic_read arch/x86/include/asm/atomic.h:29 [inline]
RIP: 0010:rcu_dynticks_curr_cpu_in_eqs kernel/rcu/tree.c:328 [inline]
RIP: 0010:rcu_is_watching+0x51/0x90 kernel/rcu/tree.c:1111
Code: 89 f0 48 c1 e8 03 42 80 3c 38 00 74 08 4c 89 f7 e8 b4 c9 52 00 48 c7 c3 a0 67 03 00 49 03 1e 48 89 d8 48 c1 e8 03 42 8a 04 38 <84> c0 75 1d 8b 03 65 ff 0d 5e f3 9f 7e 74 0b 83 e0 02 d1 e8 5b 41
RSP: 0018:ffffc90001517c30 EFLAGS: 00000802
RAX: 1ffff11015d26c00 RBX: ffff8880ae9367a0 RCX: ffff888093192200
RDX: 0000000000000000 RSI: 0000000000000003 RDI: 0000000000000000
RBP: 0000000000000001 R08: dffffc0000000000 R09: fffffbfff131e236
R10: fffffbfff131e236 R11: 0000000000000000 R12: ffff888092810000
R13: 0000000000000000 R14: ffffffff892e9898 R15: dffffc0000000000
FS:  00007fbf693f48c0(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fbf66793000 CR3: 000000009430f000 CR4: 00000000001506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 rcu_read_lock_held_common kernel/rcu/update.c:119 [inline]
 rcu_read_lock_sched_held+0x11/0xa0 kernel/rcu/update.c:134
 trace_lock_acquire+0x170/0x1d0 include/trace/events/lock.h:13
 lock_acquire+0x47/0x6f0 kernel/locking/lockdep.c:4980
 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
 _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:151
 devkmsg_read+0x15a/0xb60 kernel/printk/printk.c:895
 vfs_read+0x243/0xb40 fs/read_write.c:479
 ksys_read+0x11b/0x220 fs/read_write.c:607
 do_syscall_64+0x31/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x7fbf68984210
Code: 73 01 c3 48 8b 0d 98 7d 20 00 f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 83 3d b9 c1 20 00 00 75 10 b8 00 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 4e fc ff ff 48 89 04 24
RSP: 002b:00007ffcf89b3c58 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 00007ffcf89b66d0 RCX: 00007fbf68984210
RDX: 0000000000002000 RSI: 00007ffcf89b44d0 RDI: 0000000000000009
RBP: 0000000000000000 R08: 0000000000000008 R09: 0000556be2c857b8
R10: 0000556be2c85780 R11: 0000000000000246 R12: 00007ffcf89b44d0
R13: 00007ffcf89b6628 R14: 0000556be1fc4958 R15: 0005ae3fade82d6a