INFO: task syz-executor275:6859 blocked for more than 143 seconds.
      Not tainted 5.9.0-rc3-next-20200903-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor275 state:D stack:28104 pid: 6859 ppid:  6853 flags:0x00004000
Call Trace:
 context_switch kernel/sched/core.c:3777 [inline]
 __schedule+0xea9/0x2230 kernel/sched/core.c:4526
 schedule+0xd0/0x2a0 kernel/sched/core.c:4601
 schedule_timeout+0x1d8/0x250 kernel/time/timer.c:1855
 do_wait_for_common kernel/sched/completion.c:85 [inline]
 __wait_for_common kernel/sched/completion.c:106 [inline]
 wait_for_common kernel/sched/completion.c:117 [inline]
 wait_for_completion+0x163/0x260 kernel/sched/completion.c:138
 io_sq_thread_stop fs/io_uring.c:6906 [inline]
 io_finish_async fs/io_uring.c:6920 [inline]
 io_sq_offload_create fs/io_uring.c:7595 [inline]
 io_uring_create fs/io_uring.c:8671 [inline]
 io_uring_setup+0x1495/0x29a0 fs/io_uring.c:8744
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x440229
Code: Bad RIP value.
RSP: 002b:00007fff16b71ba8 EFLAGS: 00000246 ORIG_RAX: 00000000000001a9
RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440229
RDX: 0000000000400ad0 RSI: 0000000020000380 RDI: 0000000000006c70
RBP: 00000000006ca018 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 0000000000401a30
R13: 0000000000401ac0 R14: 0000000000000000 R15: 0000000000000000
INFO: task io_uring-sq:6860 blocked for more than 143 seconds.
      Not tainted 5.9.0-rc3-next-20200903-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:io_uring-sq     state:D stack:31200 pid: 6860 ppid:     2 flags:0x00004000
Call Trace:
 context_switch kernel/sched/core.c:3777 [inline]
 __schedule+0xea9/0x2230 kernel/sched/core.c:4526
 schedule+0xd0/0x2a0 kernel/sched/core.c:4601
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4660
 kthread+0x2ac/0x4a0 kernel/kthread.c:285
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294

Showing all locks held in the system:
1 lock held by khungtaskd/1174:
 #0: ffffffff89c67500 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:5829
2 locks held by in:imklog/6549:
 #0: ffff8880946bf3b0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:930
 #1: ffff8880ae635fd8 (&rq->lock){-.-.}-{2:2}, at: is_bpf_text_address+0x0/0x160 kernel/bpf/core.c:691

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

NMI backtrace for cpu 1
CPU: 1 PID: 1174 Comm: khungtaskd Not tainted 5.9.0-rc3-next-20200903-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+0x198/0x1fd lib/dump_stack.c:118
 nmi_cpu_backtrace.cold+0x44/0xd7 lib/nmi_backtrace.c:105
 nmi_trigger_cpumask_backtrace+0x1b3/0x223 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:339
 kthread+0x3b5/0x4a0 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: 3908 Comm: systemd-journal Not tainted 5.9.0-rc3-next-20200903-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:slab_pre_alloc_hook.constprop.0+0xcb/0x200 mm/slab.h:507
Code: 48 85 c0 49 89 c6 0f 84 cf 00 00 00 41 8b 54 24 14 89 ee 48 89 c7 48 83 c2 08 49 0f af d5 e8 ec 08 07 00 85 c0 75 43 4c 89 33 <5b> 4c 89 e0 5d 41 5c 41 5d 41 5e c3 31 d2 be f1 01 00 00 48 c7 c7
RSP: 0018:ffffc9000533fdd8 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffffc9000533fe18 RCX: 0000000000000000
RDX: dffffc0000000000 RSI: 0000000000000400 RDI: ffff8880aa06f900
RBP: 0000000000000cc0 R08: 0000000000000001 R09: ffff88809324ee88
R10: fffffbfff15796c1 R11: 0000000000000000 R12: ffff8880aa06f900
R13: 0000000000000001 R14: ffff8880aa06f900 R15: 0000000000000000
FS:  00007f3668b908c0(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f3665f34000 CR3: 0000000093763000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 slab_alloc mm/slab.c:3298 [inline]
 kmem_cache_alloc+0x46/0x3a0 mm/slab.c:3482
 prepare_creds+0x3b/0x730 kernel/cred.c:258
 access_override_creds fs/open.c:353 [inline]
 do_faccessat+0x3d7/0x820 fs/open.c:417
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x7f3667e4c9c7
Code: 83 c4 08 48 3d 01 f0 ff ff 73 01 c3 48 8b 0d c8 d4 2b 00 f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 b8 15 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d a1 d4 2b 00 f7 d8 64 89 01 48
RSP: 002b:00007ffd5246cf78 EFLAGS: 00000246 ORIG_RAX: 0000000000000015
RAX: ffffffffffffffda RBX: 00007ffd5246ffa0 RCX: 00007f3667e4c9c7
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000564f8362c9a3
RBP: 00007ffd5246d0c0 R08: 0000564f836223e5 R09: 0000000000000018
R10: 0000000000000069 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 0000564f84ba28a0 R15: 00007ffd5246d5b0