INFO: task syz-executor.1:4966 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.1  state:D stack:28752 pid: 4966 ppid:   340 flags:0x80004006
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
 get_signal+0x42d/0x1f10 kernel/signal.c:2757
 arch_do_signal+0x88/0x1a00 arch/x86/kernel/signal.c:811
 exit_to_user_mode_loop kernel/entry/common.c:135 [inline]
 exit_to_user_mode_prepare+0xf9/0x150 kernel/entry/common.c:166
 syscall_exit_to_user_mode+0x36/0x260 kernel/entry/common.c:241
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45ba81
Code: Bad RIP value.
RSP: 002b:00007ffcfb017bb0 EFLAGS: 00000293 ORIG_RAX: 0000000000000023
RAX: fffffffffffffdfc RBX: 0000000000022462 RCX: 000000000045ba81
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00007ffcfb017bc0
RBP: 0000000000000001 R08: 0000000023e1cf41 R09: 0000000023e1cf45
R10: 00007ffcfb017cc0 R11: 0000000000000293 R12: 000000000118cf40
R13: 000000000118d940 R14: ffffffffffffffff R15: 000000000118cf4c

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/225:
2 locks held by agetty/232:
 #0: ffff8881d203b098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:267
 #1: ffffc90000a262e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x223/0x1a30 drivers/tty/n_tty.c:2156

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

NMI backtrace for cpu 1
CPU: 1 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 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 115 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: 0010:write_comp_data+0x2f/0x80 kernel/kcov.c:218
Code: 05 e6 f6 c1 7e 65 48 8b 34 25 40 ef 01 00 a9 00 01 ff 00 74 0f f6 c4 01 74 59 8b 86 54 13 00 00 85 c0 74 4f 8b 86 30 13 00 00 <83> f8 03 75 44 48 8b 86 38 13 00 00 8b b6 34 13 00 00 4c 8b 00 48
RSP: 0018:ffff8881d1d87e20 EFLAGS: 00000246
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: ffffffff8173e7ef
RDX: 0000000000000001 RSI: ffff8881d23f9940 RDI: 0000000000000001
RBP: ffff8881cfe891a0 R08: 0000000000000000 R09: ffffffff895c65e7
R10: 0000000000000000 R11: ffff8881d1d87f58 R12: 0000000000000001
R13: ffffffff8173e3e5 R14: dffffc0000000000 R15: 0000000000000000
FS:  00007f049e9688c0(0000) GS:ffff8881db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f049bef4000 CR3: 00000001d215b000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 rcu_read_lock include/linux/rcupdate.h:635 [inline]
 dput+0x43f/0xbc0 fs/dcache.c:864
 path_put+0x2d/0x60 fs/namei.c:496
 do_faccessat+0x31c/0x820 fs/open.c:457
 do_syscall_64+0x2d/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x7f049dc249c7
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:00007ffd41fc5ed8 EFLAGS: 00000246 ORIG_RAX: 0000000000000015
RAX: ffffffffffffffda RBX: 00007ffd41fc8f00 RCX: 00007f049dc249c7
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00005593d0d259a3
RBP: 00007ffd41fc6020 R08: 00005593d0d1b3e5 R09: 0000000000000018
R10: 0000000000000069 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00005593d1f258a0 R15: 00007ffd41fc6510