INFO: task syz-executor.2:23117 blocked for more than 143 seconds.
      Not tainted 5.10.0-rc4-next-20201118-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.2  state:D stack:28848 pid:23117 ppid:  8495 flags:0x00004002
Call Trace:
 context_switch kernel/sched/core.c:4269 [inline]
 __schedule+0x890/0x2030 kernel/sched/core.c:5019
 schedule+0xcf/0x270 kernel/sched/core.c:5098
 io_uring_cancel_files fs/io_uring.c:8720 [inline]
 io_uring_cancel_task_requests fs/io_uring.c:8772 [inline]
 __io_uring_files_cancel+0xc4d/0x14b0 fs/io_uring.c:8868
 io_uring_files_cancel include/linux/io_uring.h:51 [inline]
 exit_files+0xe4/0x170 fs/file.c:456
 do_exit+0xb61/0x29f0 kernel/exit.c:818
 do_group_exit+0x125/0x310 kernel/exit.c:920
 get_signal+0x3ea/0x1f70 kernel/signal.c:2750
 arch_do_signal_or_restart+0x2a6/0x1ea0 arch/x86/kernel/signal.c:811
 handle_signal_work kernel/entry/common.c:145 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:169 [inline]
 exit_to_user_mode_prepare+0x124/0x200 kernel/entry/common.c:199
 syscall_exit_to_user_mode+0x38/0x260 kernel/entry/common.c:274
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45deb9
Code: Unable to access opcode bytes at RIP 0x45de8f.
RSP: 002b:00007f442d700cf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 000000000118bf28 RCX: 000000000045deb9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000118bf28
RBP: 000000000118bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118bf2c
R13: 00007ffd48d1dcef R14: 00007f442d7019c0 R15: 000000000118bf2c

Showing all locks held in the system:
4 locks held by kworker/u4:1/21:
1 lock held by khungtaskd/1655:
 #0: ffffffff8b339ca0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6252
1 lock held by in:imklog/8174:
 #0: ffff88801bb30af0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:932

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

NMI backtrace for cpu 0
CPU: 0 PID: 1655 Comm: khungtaskd Not tainted 5.10.0-rc4-next-20201118-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:147 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:253 [inline]
 watchdog+0xd89/0xf30 kernel/hung_task.c:338
 kthread+0x3af/0x4a0 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 21 Comm: kworker/u4:1 Not tainted 5.10.0-rc4-next-20201118-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: krdsd rds_connect_worker
RIP: 0010:__lock_acquire+0xd17/0x5c00 kernel/locking/lockdep.c:4833
Code: 85 ed 3a 00 00 8b 35 04 38 97 0b 85 f6 0f 84 00 01 00 00 48 b8 00 00 00 00 00 fc ff df 48 8b 54 24 68 48 c1 ea 03 80 3c 02 00 <0f> 85 04 4a 00 00 48 8b 14 24 4c 89 b5 18 09 00 00 48 b8 00 00 00
RSP: 0018:ffffc90000dbf7c8 EFLAGS: 00000046
RAX: dffffc0000000000 RBX: ffffffff8e6a8f00 RCX: ffffffff81564224
RDX: 1ffff110021c2473 RSI: 0000000000000001 RDI: ffffffff8e6a8f18
RBP: ffff888010e11a80 R08: 0000000000000000 R09: ffffffff8ebc07e7
R10: fffffbfff1d780fc R11: 0000000000000000 R12: ffff888010e12448
R13: dffffc0000000000 R14: 6ef2b0cb8dcdbee0 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8880b9f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c0000a1000 CR3: 0000000012e01000 CR4: 00000000001506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 lock_acquire kernel/locking/lockdep.c:5435 [inline]
 lock_acquire+0x2a3/0x8c0 kernel/locking/lockdep.c:5400
 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:135 [inline]
 _raw_spin_lock_bh+0x2f/0x40 kernel/locking/spinlock.c:175
 spin_lock_bh include/linux/spinlock.h:359 [inline]
 inet_csk_find_open_port net/ipv4/inet_connection_sock.c:229 [inline]
 inet_csk_get_port+0x9b1/0x1690 net/ipv4/inet_connection_sock.c:367
 __inet_bind+0x796/0xbc0 net/ipv4/af_inet.c:528
 inet_bind+0xf0/0x160 net/ipv4/af_inet.c:457
 rds_tcp_conn_path_connect+0x532/0x880 net/rds/tcp_connect.c:144
 rds_connect_worker+0x1a5/0x2c0 net/rds/threads.c:176
 process_one_work+0x933/0x15a0 kernel/workqueue.c:2272
 worker_thread+0x64c/0x1120 kernel/workqueue.c:2418
 kthread+0x3af/0x4a0 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296