INFO: task syz-executor.0:17358 blocked for more than 143 seconds.
      Not tainted 5.9.0-rc1-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.0  state:D stack:29112 pid:17358 ppid:   340 flags:0x80004002
Call Trace:
 context_switch kernel/sched/core.c:3778 [inline]
 __schedule+0x889/0x1f70 kernel/sched/core.c:4527
 schedule+0xcd/0x2b0 kernel/sched/core.c:4602
 wdm_flush+0x2e9/0x3c0 drivers/usb/class/cdc-wdm.c:590
 filp_close+0xb4/0x170 fs/open.c:1276
 close_files fs/file.c:401 [inline]
 put_files_struct fs/file.c:429 [inline]
 put_files_struct+0x1d0/0x350 fs/file.c:426
 exit_files+0x7e/0xa0 fs/file.c:458
 do_exit+0xb75/0x2890 kernel/exit.c:801
 do_group_exit+0x125/0x310 kernel/exit.c:903
 __do_sys_exit_group kernel/exit.c:914 [inline]
 __se_sys_exit_group kernel/exit.c:912 [inline]
 __x64_sys_exit_group+0x3a/0x50 kernel/exit.c:912
 do_syscall_64+0x2d/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45d5b9
Code: Bad RIP value.
RSP: 002b:00007f12e6d70648 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 000000000000000b RCX: 000000000045d5b9
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 000000000000000b
RBP: 0000000000000003 R08: 0000000000000083 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000020000000
R13: 00007fff26d5fd2f R14: 00007f12e6d729c0 R15: 000000000118d08c

Showing all locks held in the system:
1 lock held by khungtaskd/23:
 #0: ffffffff87313620 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x264 kernel/locking/lockdep.c:5825
1 lock held by in:imklog/220:
 #0: ffff8881c8ccbc70 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:930
5 locks held by kworker/0:6/3545:
2 locks held by agetty/24065:
 #0: ffff8881d246a098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:267
 #1: ffffc90010b092e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x223/0x1a30 drivers/tty/n_tty.c:2156
2 locks held by agetty/9892:
 #0: ffff8881ca73f098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:267
 #1: ffffc9000fdf12e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x223/0x1a30 drivers/tty/n_tty.c:2156

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

NMI backtrace for cpu 0
CPU: 0 PID: 23 Comm: khungtaskd Not tainted 5.9.0-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+0xf6/0x16e lib/dump_stack.c:118
 nmi_cpu_backtrace.cold+0x74/0xb6 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x1da/0x1f4 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+0xd6a/0xfd0 kernel/hung_task.c:295
 kthread+0x392/0x470 kernel/kthread.c:292
 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: 109 Comm: systemd-journal Not tainted 5.9.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0033:0x7f588841e76d
Code: 00 0f 87 d6 00 00 00 4a 8d 14 2e 48 8b 42 08 48 83 f8 10 0f 86 3c 06 00 00 48 83 e0 f8 48 3b 87 80 08 00 00 0f 83 2b 06 00 00 <8b> 35 59 40 32 00 4c 8d 43 10 85 f6 0f 85 b1 07 00 00 64 83 3c 25
RSP: 002b:00007ffec7d3a5b0 EFLAGS: 00000283
RAX: 0000000000000040 RBX: 0000559469cd5c50 RCX: fffffffffffffe00
RDX: 0000559469cd5ca0 RSI: 0000559469cd5c50 RDI: 00007f5888740b00
RBP: 00007f5888740b00 R08: 00007f5888740bd8 R09: 00000000ffffffff
R10: 0000000000000069 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000050 R14: 00007ffec7d3a920 R15: 0000559469cd6450
FS:  00007f58891c68c0 GS:  0000000000000000