INFO: task login:9742 blocked for more than 143 seconds.
Not tainted 5.5.0-rc1-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
login D23224 9742 1 0x80000002
Call Trace:
context_switch kernel/sched/core.c:3385 [inline]
__schedule+0x934/0x1f90 kernel/sched/core.c:4081
schedule+0xdc/0x2b0 kernel/sched/core.c:4155
schedule_timeout+0x717/0xc50 kernel/time/timer.c:1871
down_write_failed drivers/tty/tty_ldsem.c:262 [inline]
__ldsem_down_write_nested+0x3b2/0x8f0 drivers/tty/tty_ldsem.c:324
ldsem_down_write+0x33/0x40 drivers/tty/tty_ldsem.c:366
__tty_ldisc_lock drivers/tty/tty_ldisc.c:315 [inline]
tty_ldisc_lock+0x66/0xb0 drivers/tty/tty_ldisc.c:339
tty_ldisc_hangup+0x1c6/0x640 drivers/tty/tty_ldisc.c:745
__tty_hangup.part.0+0x2fb/0x750 drivers/tty/tty_io.c:625
__tty_hangup drivers/tty/tty_io.c:575 [inline]
tty_vhangup_session+0x25/0x30 drivers/tty/tty_io.c:735
disassociate_ctty.part.0+0xb4/0x740 drivers/tty/tty_jobctrl.c:267
disassociate_ctty+0x81/0xa0 drivers/tty/tty_jobctrl.c:261
do_exit+0x1b42/0x2ef0 kernel/exit.c:795
do_group_exit+0x135/0x360 kernel/exit.c:895
__do_sys_exit_group kernel/exit.c:906 [inline]
__se_sys_exit_group kernel/exit.c:904 [inline]
__x64_sys_exit_group+0x44/0x50 kernel/exit.c:904
do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7ff7421621e8
Code: Bad RIP value.
RSP: 002b:00007ffc5aa54328 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007ff7421621e8
RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000
RBP: 00007ff742437840 R08: 00000000000000e7 R09: ffffffffffffffa8
R10: 00007ff74243d740 R11: 0000000000000246 R12: 00007ff742437840
R13: 0000000000000001 R14: 0000000000000001 R15: 000000000060b798
Showing all locks held in the system:
1 lock held by khungtaskd/1116:
#0: ffffffff899a56c0 (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x279 kernel/locking/lockdep.c:5334
1 lock held by rsyslogd/9620:
#0: ffff88809f38fba0 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110 fs/file.c:801
2 locks held by login/9742:
#0: ffff888087fee198 (&tty->legacy_mutex){+.+.}, at: tty_lock+0xc7/0x130 drivers/tty/tty_mutex.c:19
#1: ffff888087fee090 (&tty->ldisc_sem){++++}, at: ldsem_down_write+0x33/0x40 drivers/tty/tty_ldsem.c:366
2 locks held by getty/9743:
#0: ffff888087fef090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340
#1: ffffc9000198b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156
2 locks held by getty/9744:
#0: ffff888099c0a090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340
#1: ffffc90001a0b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156
2 locks held by getty/9745:
#0: ffff8880a6844090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340
#1: ffffc900019eb2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156
2 locks held by getty/9746:
#0: ffff8880a6876090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340
#1: ffffc900019db2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156
2 locks held by getty/9747:
#0: ffff888088d2a090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340
#1: ffffc900019fb2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156
2 locks held by getty/9748:
#0: ffff8880a72fa090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340
#1: ffffc900019532e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156
2 locks held by syz-executor701/10373:
#0: ffff888087fee090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340
#1: ffff8880aa5bc0a8 (&buf->lock){+.+.}, at: tty_buffer_lock_exclusive+0x30/0x40 drivers/tty/tty_buffer.c:61
=============================================
NMI backtrace for cpu 1
CPU: 1 PID: 1116 Comm: khungtaskd Not tainted 5.5.0-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+0x197/0x210 lib/dump_stack.c:118
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+0xb11/0x10c0 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 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 10373 Comm: syz-executor701 Not tainted 5.5.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:lock_release+0x4d9/0x960 kernel/locking/lockdep.c:4493
Code: 08 00 0f 84 7f 01 00 00 48 8b bd 48 ff ff ff 57 9d 0f 1f 44 00 00 48 b8 00 00 00 00 00 fc ff df 48 01 c3 48 c7 03 00 00 00 00 <c7> 43 08 00 00 00 00 48 8b 45 d0 65 48 33 04 25 28 00 00 00 0f 85
RSP: 0018:ffffc900020676c0 EFLAGS: 00000086
RAX: dffffc0000000000 RBX: fffff5200040cedd RCX: 1ffff110128ea1b1
RDX: dffffc0000000000 RSI: 1ffff110128ea1bd RDI: 0000000000000086
RBP: ffffc90002067790 R08: 0000000000000003 R09: ffff888094750d90
R10: fffffbfff14f3330 R11: ffffffff8a799987 R12: ffff888094750500
R13: ffffffff87c73dfd R14: ffffc90002067768 R15: ffff888094750500
FS: 00007fe903c32700(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffff600400 CR3: 00000000a4bf4000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:166 [inline]
_raw_spin_unlock_irq+0x16/0x80 kernel/locking/spinlock.c:199
rq_unlock_irq kernel/sched/sched.h:1240 [inline]
__schedule+0x155d/0x1f90 kernel/sched/core.c:4084
schedule+0xdc/0x2b0 kernel/sched/core.c:4155
paste_selection+0x2f5/0x460 drivers/tty/vt/selection.c:367
tioclinux+0x133/0x480 drivers/tty/vt/vt.c:3044
vt_ioctl+0x1a41/0x26d0 drivers/tty/vt/vt_ioctl.c:364
tty_ioctl+0xa37/0x14f0 drivers/tty/tty_io.c:2660
vfs_ioctl fs/ioctl.c:47 [inline]
file_ioctl fs/ioctl.c:545 [inline]
do_vfs_ioctl+0x977/0x14e0 fs/ioctl.c:732
ksys_ioctl+0xab/0xd0 fs/ioctl.c:749
__do_sys_ioctl fs/ioctl.c:756 [inline]
__se_sys_ioctl fs/ioctl.c:754 [inline]
__x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:754
do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x446f59
Code: e8 4c 0b 03 00 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 8b 08 fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fe903c31db8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00000000006dcc28 RCX: 0000000000446f59
RDX: 0000000020000080 RSI: 000000000000541c RDI: 0000000000000004
RBP: 00000000006dcc20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dcc2c
R13: 00007fff7a915f8f R14: 00007fe903c329c0 R15: 00000000006dcc20