INFO: task syz-executor.5:19511 blocked for more than 143 seconds.
      Not tainted 5.3.0-rc3+ #104
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.5  D30264 19511  19510 0x80000000
Call Trace:
 context_switch kernel/sched/core.c:3254 [inline]
 __schedule+0x755/0x1580 kernel/sched/core.c:3880
 schedule+0xa8/0x270 kernel/sched/core.c:3944
 rwsem_down_read_slowpath+0x4cc/0xfb0 kernel/locking/rwsem.c:1090
 __down_read kernel/locking/rwsem.c:1320 [inline]
 down_read+0x1f4/0x3f0 kernel/locking/rwsem.c:1463
 acct_collect+0xf3/0x850 kernel/acct.c:542
 do_exit+0x1b56/0x2e50 kernel/exit.c:858
 do_group_exit+0x135/0x360 kernel/exit.c:983
 __do_sys_exit_group kernel/exit.c:994 [inline]
 __se_sys_exit_group kernel/exit.c:992 [inline]
 __x64_sys_exit_group+0x44/0x50 kernel/exit.c:992
 do_syscall_64+0xfd/0x6a0 arch/x86/entry/common.c:296
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x459829
Code: Bad RIP value.
RSP: 002b:00007f6028399688 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 000000000000000b RCX: 0000000000459829
RDX: 0000000000459829 RSI: 00007f60283996c0 RDI: 000000000000000b
RBP: 000000000075bfc8 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 00007f602839a6d4
R13: 00000000004bfce6 R14: 00000000004d1a38 R15: 00000000ffffffff
INFO: lockdep is turned off.
NMI backtrace for cpu 0
CPU: 0 PID: 1056 Comm: khungtaskd Not tainted 5.3.0-rc3+ #104
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+0x172/0x1f0 lib/dump_stack.c:113
 nmi_cpu_backtrace.cold+0x70/0xb2 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x23b/0x28b lib/nmi_backtrace.c:62
 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38
 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:205 [inline]
 watchdog+0x9d0/0xef0 kernel/hung_task.c:289
 kthread+0x361/0x430 kernel/kthread.c:255
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 3907 Comm: udevd Not tainted 5.3.0-rc3+ #104
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:trace_hardirqs_off+0x11/0x240 kernel/trace/trace_preemptirq.c:38
Code: ff 4c 89 f2 4c 89 ee 4c 89 e7 e8 da ca 02 00 41 5c 41 5d 41 5e 5d c3 66 90 55 48 89 e5 41 57 41 56 41 55 41 54 53 48 83 ec 08 <e8> 2a 86 fa ff 65 8b 1d d3 f9 8a 7e 31 ff 89 de e8 9a 87 fa ff 85
RSP: 0018:ffff888096ba7bb0 EFLAGS: 00000082
RAX: 1ffffffff11a5e63 RBX: ffffffff81c9ae50 RCX: 0000000000000000
RDX: dffffc0000000000 RSI: ffffffff81c9b7e1 RDI: ffff888095cf9b20
RBP: ffff888096ba7be0 R08: ffff888096b9a580 R09: ffffed10135b34c1
R10: ffffed10135b34c0 R11: ffff88809ad9a607 R12: ffff888095cf9b20
R13: ffff888096ba7dc0 R14: ffff888095cf9b10 R15: ffff888095cf9b20
FS:  00007ffa290827a0(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007faaebc09000 CR3: 0000000096f54000 CR4: 00000000001406e0
Call Trace:
 __raw_write_lock_irq include/linux/rwlock_api_smp.h:194 [inline]
 _raw_write_lock_irq+0x3a/0x80 kernel/locking/spinlock.c:311
 ep_scan_ready_list+0x313/0xb20 fs/eventpoll.c:706
 ep_send_events fs/eventpoll.c:1793 [inline]
 ep_poll+0x1f9/0xe60 fs/eventpoll.c:1930
 do_epoll_wait+0x210/0x260 fs/eventpoll.c:2294
 __do_sys_epoll_wait fs/eventpoll.c:2304 [inline]
 __se_sys_epoll_wait fs/eventpoll.c:2301 [inline]
 __x64_sys_epoll_wait+0x97/0xf0 fs/eventpoll.c:2301
 do_syscall_64+0xfd/0x6a0 arch/x86/entry/common.c:296
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7ffa28796943
Code: 00 31 d2 48 29 c2 64 89 11 48 83 c8 ff eb ea 90 90 90 90 90 90 90 90 83 3d b5 dc 2a 00 00 75 13 49 89 ca b8 e8 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 34 c3 48 83 ec 08 e8 3b c4 00 00 48 89 04 24
RSP: 002b:00007ffea1f3db98 EFLAGS: 00000246 ORIG_RAX: 00000000000000e8
RAX: ffffffffffffffda RBX: 0000000000000bb8 RCX: 00007ffa28796943
RDX: 0000000000000008 RSI: 00007ffea1f3dc90 RDI: 000000000000000a
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000001
R10: 0000000000000bb8 R11: 0000000000000246 R12: 0000000000000003
R13: 0000000000000000 R14: 00000000014c4660 R15: 00000000014bc250