INFO: task login:7493 blocked for more than 140 seconds.
Not tainted 4.19.88-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
login D25064 7493 1 0x80000002
Call Trace:
context_switch kernel/sched/core.c:2826 [inline]
__schedule+0x866/0x1dc0 kernel/sched/core.c:3515
schedule+0x92/0x1c0 kernel/sched/core.c:3559
schedule_timeout+0x8c8/0xfc0 kernel/time/timer.c:1782
down_write_failed drivers/tty/tty_ldsem.c:284 [inline]
__ldsem_down_write_nested+0x3b3/0x8f0 drivers/tty/tty_ldsem.c:346
ldsem_down_write+0x33/0x40 drivers/tty/tty_ldsem.c:388
__tty_ldisc_lock drivers/tty/tty_ldisc.c:320 [inline]
tty_ldisc_lock+0x1e/0x60 drivers/tty/tty_ldisc.c:339
tty_ldisc_hangup+0x1b8/0x630 drivers/tty/tty_ldisc.c:739
__tty_hangup.part.0+0x306/0x720 drivers/tty/tty_io.c:623
__tty_hangup drivers/tty/tty_io.c:573 [inline]
tty_vhangup_session+0x25/0x30 drivers/tty/tty_io.c:733
disassociate_ctty.part.0+0xb4/0x6f0 drivers/tty/tty_jobctrl.c:267
disassociate_ctty+0x81/0xa0 drivers/tty/tty_jobctrl.c:261
do_exit+0x17bb/0x3080 kernel/exit.c:874
do_group_exit+0x135/0x370 kernel/exit.c:979
__do_sys_exit_group kernel/exit.c:990 [inline]
__se_sys_exit_group kernel/exit.c:988 [inline]
__x64_sys_exit_group+0x44/0x50 kernel/exit.c:988
do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7f02a5aa71e8
Code: Bad RIP value.
RSP: 002b:00007ffefb505428 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f02a5aa71e8
RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000
RBP: 00007f02a5d7c840 R08: 00000000000000e7 R09: ffffffffffffffa8
R10: 00007f02a5d82740 R11: 0000000000000246 R12: 00007f02a5d7c840
R13: 0000000000000001 R14: 0000000000000001 R15: 000000000060b798
Showing all locks held in the system:
1 lock held by khungtaskd/1069:
#0: 00000000e82d5014 (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x27e kernel/locking/lockdep.c:4438
2 locks held by rs:main Q:Reg/7365:
1 lock held by rsyslogd/7367:
#0: 00000000ea74e499 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110 fs/file.c:767
2 locks held by getty/7490:
#0: 00000000707e5237 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:362
#1: 000000001a31bcab (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b30 drivers/tty/n_tty.c:2154
2 locks held by getty/7491:
#0: 0000000037ee0d65 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:362
#1: 00000000d50b0637 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b30 drivers/tty/n_tty.c:2154
2 locks held by getty/7492:
#0: 00000000a8c550c9 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:362
#1: 00000000ae89fffb (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b30 drivers/tty/n_tty.c:2154
2 locks held by login/7493:
#0: 00000000b23e8d29 (&tty->legacy_mutex){+.+.}, at: tty_lock+0x73/0xb0 drivers/tty/tty_mutex.c:19
#1: 0000000011e7398d (&tty->ldisc_sem){++++}, at: ldsem_down_write+0x33/0x40 drivers/tty/tty_ldsem.c:388
2 locks held by getty/7494:
#0: 0000000012ba2c9c (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:362
#1: 00000000374027ce (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b30 drivers/tty/n_tty.c:2154
2 locks held by getty/7495:
#0: 00000000f7d60692 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:362
#1: 000000006bf0e224 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b30 drivers/tty/n_tty.c:2154
2 locks held by getty/7496:
#0: 00000000a247e517 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:362
#1: 000000006fdc391e (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b30 drivers/tty/n_tty.c:2154
2 locks held by syz-executor534/7663:
=============================================
NMI backtrace for cpu 0
CPU: 0 PID: 1069 Comm: khungtaskd Not tainted 4.19.88-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+0x63/0xa4 lib/nmi_backtrace.c:101
nmi_trigger_cpumask_backtrace+0x1b0/0x1f8 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:203 [inline]
watchdog+0x9df/0xee0 kernel/hung_task.c:287
kthread+0x354/0x420 kernel/kthread.c:246
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 7663 Comm: syz-executor534 Not tainted 4.19.88-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:match_held_lock+0x12/0x500 kernel/locking/lockdep.c:3471
Code: b3 fe ff ff 48 c7 c7 68 5c f2 88 e8 b8 2d 51 00 e9 1d ff ff ff 0f 1f 00 48 b8 00 00 00 00 00 fc ff df 55 48 89 e5 41 57 41 56 <41> 55 41 54 53 48 89 fb 48 83 c7 10 48 89 fa 48 83 ec 08 48 c1 ea
RSP: 0018:ffff8880915af748 EFLAGS: 00000002
RAX: dffffc0000000000 RBX: ffff88809519c200 RCX: ffff88809519ca80
RDX: 0000000000000000 RSI: ffff8880ae92c258 RDI: ffff88809519cad0
RBP: ffff8880915af758 R08: ffff88809519c200 R09: ffffed1015d25849
R10: ffffed1015d25848 R11: ffff8880ae92c243 R12: ffff8880ae92c258
R13: ffffed1012a3394f R14: 0000000000000002 R15: ffff88809519cad0
FS: 00000000022be880(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffff600400 CR3: 0000000081635000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
__lock_is_held+0xb6/0x140 kernel/locking/lockdep.c:3723
lock_is_held_type+0x110/0x210 kernel/locking/lockdep.c:3941
lock_is_held include/linux/lockdep.h:344 [inline]
update_rq_clock+0x21c/0x2b0 kernel/sched/core.c:190
__schedule+0x253/0x1dc0 kernel/sched/core.c:3458
schedule+0x92/0x1c0 kernel/sched/core.c:3559
paste_selection+0x2e8/0x443 drivers/tty/vt/selection.c:354
tioclinux+0x133/0x470 drivers/tty/vt/vt.c:3019
vt_ioctl+0x19ab/0x2530 drivers/tty/vt/vt_ioctl.c:364
tty_ioctl+0x7f3/0x1510 drivers/tty/tty_io.c:2669
vfs_ioctl fs/ioctl.c:46 [inline]
file_ioctl fs/ioctl.c:501 [inline]
do_vfs_ioctl+0xd5f/0x1380 fs/ioctl.c:688
ksys_ioctl+0xab/0xd0 fs/ioctl.c:705
__do_sys_ioctl fs/ioctl.c:712 [inline]
__se_sys_ioctl fs/ioctl.c:710 [inline]
__x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:710
do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4416e9
Code: e8 bc b2 02 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 6b 08 fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fff2472ae38 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 000000000007bb3a RCX: 00000000004416e9
RDX: 0000000020000080 RSI: 000000000000541c RDI: 0000000000000003
RBP: 0000000000000000 R08: 000000000000000d R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000000008f
R13: 0000000000402470 R14: 0000000000000000 R15: 0000000000000000