INFO: task hung in con_install
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syzbot
Jan 7, 2020, 3:17:10 AM1/7/20
to daniel...@ffwll.ch, gha...@redhat.com, gre...@linuxfoundation.org, jsl...@suse.com, linux-...@vger.kernel.org, ni...@fluxnic.net, s...@ravnborg.org, syzkall...@googlegroups.com, text...@uchuujin.de
Hello,
syzbot found the following crash on:
HEAD commit: fd698849 Linux 5.5-rc4
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1170c085e00000
kernel config: https://syzkaller.appspot.com/x/.config?x=874bac2ff63646fa
dashboard link: https://syzkaller.appspot.com/bug?extid=370b0e19c5405cfd7173
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
Unfortunately, I don't have any reproducer for this crash yet.
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+370b0e...@syzkaller.appspotmail.com
INFO: task syz-executor.4:30304 blocked for more than 143 seconds.
Not tainted 5.5.0-rc4-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.4 D28552 30304 9223 0x00000004
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_common kernel/locking/semaphore.c:220 [inline]
__down+0x176/0x2c0 kernel/locking/semaphore.c:237
down+0x64/0x90 kernel/locking/semaphore.c:61
console_lock+0x29/0x80 kernel/printk/printk.c:2289
con_install+0x4a/0x410 drivers/tty/vt/vt.c:3228
tty_driver_install_tty drivers/tty/tty_io.c:1228 [inline]
tty_init_dev drivers/tty/tty_io.c:1341 [inline]
tty_init_dev+0xf9/0x470 drivers/tty/tty_io.c:1318
tty_open_by_driver drivers/tty/tty_io.c:1987 [inline]
tty_open+0x4a5/0xbb0 drivers/tty/tty_io.c:2035
chrdev_open+0x245/0x6b0 fs/char_dev.c:414
do_dentry_open+0x4e6/0x1380 fs/open.c:797
vfs_open+0xa0/0xd0 fs/open.c:914
do_last fs/namei.c:3420 [inline]
path_openat+0x10df/0x4500 fs/namei.c:3537
do_filp_open+0x1a1/0x280 fs/namei.c:3567
do_sys_open+0x3fe/0x5d0 fs/open.c:1097
__do_sys_open fs/open.c:1115 [inline]
__se_sys_open fs/open.c:1110 [inline]
__x64_sys_open+0x7e/0xc0 fs/open.c:1110
do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4146b1
Code: 18 48 8d 6c 24 18 48 8d 05 3c 2b 04 00 48 89 44 24 08 48 8b 44 24 28
48 89 44 24 10 48 8d 44 24 08 48 89 04 24 e8 4f 57 04 00 <48> 8b 6c 24 18
48 83 c4 20 c3 e8 90 58 04 00 eb ae cc cc cc cc cc
RSP: 002b:00007fd6e11307a0 EFLAGS: 00000293 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000004146b1
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 00007fd6e11307d0
RBP: 000000000075bf20 R08: 0000000000000000 R09: 000000000000000e
R10: 0000000000000064 R11: 0000000000000293 R12: 00007fd6e11316d4
R13: 00000000004cb17d R14: 00000000004e4888 R15: 00000000ffffffff
INFO: task syz-executor.1:30305 blocked for more than 143 seconds.
Not tainted 5.5.0-rc4-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.1 D28552 30305 9214 0x00004004
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_preempt_disabled+0x13/0x20 kernel/sched/core.c:4214
__mutex_lock_common kernel/locking/mutex.c:1033 [inline]
__mutex_lock+0x7ab/0x13c0 kernel/locking/mutex.c:1103
mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1118
tty_open_by_driver drivers/tty/tty_io.c:1951 [inline]
tty_open+0x3cb/0xbb0 drivers/tty/tty_io.c:2035
chrdev_open+0x245/0x6b0 fs/char_dev.c:414
do_dentry_open+0x4e6/0x1380 fs/open.c:797
vfs_open+0xa0/0xd0 fs/open.c:914
do_last fs/namei.c:3420 [inline]
path_openat+0x10df/0x4500 fs/namei.c:3537
do_filp_open+0x1a1/0x280 fs/namei.c:3567
do_sys_open+0x3fe/0x5d0 fs/open.c:1097
__do_sys_open fs/open.c:1115 [inline]
__se_sys_open fs/open.c:1110 [inline]
__x64_sys_open+0x7e/0xc0 fs/open.c:1110
do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4146b1
Code: 18 48 8d 6c 24 18 48 8d 05 3c 2b 04 00 48 89 44 24 08 48 8b 44 24 28
48 89 44 24 10 48 8d 44 24 08 48 89 04 24 e8 4f 57 04 00 <48> 8b 6c 24 18
48 83 c4 20 c3 e8 90 58 04 00 eb ae cc cc cc cc cc
RSP: 002b:00007fd548a717a0 EFLAGS: 00000293 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000004146b1
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 00007fd548a717d0
RBP: 000000000075bf20 R08: 0000000000000000 R09: 000000000000000e
R10: 0000000000000064 R11: 0000000000000293 R12: 00007fd548a726d4
R13: 00000000004cb17d R14: 00000000004e4888 R15: 00000000ffffffff
INFO: task syz-executor.3:30397 blocked for more than 143 seconds.
Not tainted 5.5.0-rc4-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.3 D28552 30397 9220 0x00004004
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_preempt_disabled+0x13/0x20 kernel/sched/core.c:4214
__mutex_lock_common kernel/locking/mutex.c:1033 [inline]
__mutex_lock+0x7ab/0x13c0 kernel/locking/mutex.c:1103
mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1118
tty_open_by_driver drivers/tty/tty_io.c:1951 [inline]
tty_open+0x3cb/0xbb0 drivers/tty/tty_io.c:2035
chrdev_open+0x245/0x6b0 fs/char_dev.c:414
do_dentry_open+0x4e6/0x1380 fs/open.c:797
vfs_open+0xa0/0xd0 fs/open.c:914
do_last fs/namei.c:3420 [inline]
path_openat+0x10df/0x4500 fs/namei.c:3537
do_filp_open+0x1a1/0x280 fs/namei.c:3567
do_sys_open+0x3fe/0x5d0 fs/open.c:1097
__do_sys_open fs/open.c:1115 [inline]
__se_sys_open fs/open.c:1110 [inline]
__x64_sys_open+0x7e/0xc0 fs/open.c:1110
do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4146b1
Code: 18 48 8d 6c 24 18 48 8d 05 3c 2b 04 00 48 89 44 24 08 48 8b 44 24 28
48 89 44 24 10 48 8d 44 24 08 48 89 04 24 e8 4f 57 04 00 <48> 8b 6c 24 18
48 83 c4 20 c3 e8 90 58 04 00 eb ae cc cc cc cc cc
RSP: 002b:00007efd38a3e7a0 EFLAGS: 00000293 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000004146b1
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 00007efd38a3e7d0
RBP: 000000000075bf20 R08: 0000000000000000 R09: 000000000000000e
R10: 0000000000000064 R11: 0000000000000293 R12: 00007efd38a3f6d4
R13: 00000000004cb17d R14: 00000000004e4888 R15: 00000000ffffffff
INFO: task syz-executor.3:30508 blocked for more than 143 seconds.
Not tainted 5.5.0-rc4-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.3 D28304 30508 9220 0x00000004
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_preempt_disabled+0x13/0x20 kernel/sched/core.c:4214
__mutex_lock_common kernel/locking/mutex.c:1033 [inline]
__mutex_lock+0x7ab/0x13c0 kernel/locking/mutex.c:1103
mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1118
tty_open_by_driver drivers/tty/tty_io.c:1951 [inline]
tty_open+0x3cb/0xbb0 drivers/tty/tty_io.c:2035
chrdev_open+0x245/0x6b0 fs/char_dev.c:414
do_dentry_open+0x4e6/0x1380 fs/open.c:797
vfs_open+0xa0/0xd0 fs/open.c:914
do_last fs/namei.c:3420 [inline]
path_openat+0x10df/0x4500 fs/namei.c:3537
do_filp_open+0x1a1/0x280 fs/namei.c:3567
do_sys_open+0x3fe/0x5d0 fs/open.c:1097
__do_sys_open fs/open.c:1115 [inline]
__se_sys_open fs/open.c:1110 [inline]
__x64_sys_open+0x7e/0xc0 fs/open.c:1110
do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4146b1
Code: 18 48 8d 6c 24 18 48 8d 05 3c 2b 04 00 48 89 44 24 08 48 8b 44 24 28
48 89 44 24 10 48 8d 44 24 08 48 89 04 24 e8 4f 57 04 00 <48> 8b 6c 24 18
48 83 c4 20 c3 e8 90 58 04 00 eb ae cc cc cc cc cc
RSP: 002b:00007efd38a1d7a0 EFLAGS: 00000293 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000004146b1
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 00007efd38a1d7d0
RBP: 000000000075bfc8 R08: 0000000000000000 R09: 000000000000000e
R10: 0000000000000064 R11: 0000000000000293 R12: 00007efd38a1e6d4
R13: 00000000004cb17d R14: 00000000004e4888 R15: 00000000ffffffff
INFO: task syz-executor.5:30847 blocked for more than 143 seconds.
Not tainted 5.5.0-rc4-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.5 D28552 30847 7317 0x00004004
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_preempt_disabled+0x13/0x20 kernel/sched/core.c:4214
__mutex_lock_common kernel/locking/mutex.c:1033 [inline]
__mutex_lock+0x7ab/0x13c0 kernel/locking/mutex.c:1103
mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1118
tty_open_by_driver drivers/tty/tty_io.c:1951 [inline]
tty_open+0x3cb/0xbb0 drivers/tty/tty_io.c:2035
chrdev_open+0x245/0x6b0 fs/char_dev.c:414
do_dentry_open+0x4e6/0x1380 fs/open.c:797
vfs_open+0xa0/0xd0 fs/open.c:914
do_last fs/namei.c:3420 [inline]
path_openat+0x10df/0x4500 fs/namei.c:3537
do_filp_open+0x1a1/0x280 fs/namei.c:3567
do_sys_open+0x3fe/0x5d0 fs/open.c:1097
__do_sys_open fs/open.c:1115 [inline]
__se_sys_open fs/open.c:1110 [inline]
__x64_sys_open+0x7e/0xc0 fs/open.c:1110
do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4146b1
Code: 18 48 8d 6c 24 18 48 8d 05 3c 2b 04 00 48 89 44 24 08 48 8b 44 24 28
48 89 44 24 10 48 8d 44 24 08 48 89 04 24 e8 4f 57 04 00 <48> 8b 6c 24 18
48 83 c4 20 c3 e8 90 58 04 00 eb ae cc cc cc cc cc
RSP: 002b:00007f2455ce37a0 EFLAGS: 00000293 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000004146b1
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 00007f2455ce37d0
RBP: 000000000075bf20 R08: 0000000000000000 R09: 000000000000000e
R10: 0000000000000064 R11: 0000000000000293 R12: 00007f2455ce46d4
R13: 00000000004cb067 R14: 00000000004e4738 R15: 00000000ffffffff
INFO: task syz-executor.5:30861 blocked for more than 143 seconds.
Not tainted 5.5.0-rc4-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.5 D28240 30861 7317 0x00000004
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_preempt_disabled+0x13/0x20 kernel/sched/core.c:4214
__mutex_lock_common kernel/locking/mutex.c:1033 [inline]
__mutex_lock+0x7ab/0x13c0 kernel/locking/mutex.c:1103
mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1118
tty_open_by_driver drivers/tty/tty_io.c:1951 [inline]
tty_open+0x3cb/0xbb0 drivers/tty/tty_io.c:2035
chrdev_open+0x245/0x6b0 fs/char_dev.c:414
do_dentry_open+0x4e6/0x1380 fs/open.c:797
vfs_open+0xa0/0xd0 fs/open.c:914
do_last fs/namei.c:3420 [inline]
path_openat+0x10df/0x4500 fs/namei.c:3537
do_filp_open+0x1a1/0x280 fs/namei.c:3567
do_sys_open+0x3fe/0x5d0 fs/open.c:1097
__do_sys_open fs/open.c:1115 [inline]
__se_sys_open fs/open.c:1110 [inline]
__x64_sys_open+0x7e/0xc0 fs/open.c:1110
do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4146b1
Code: 18 48 8d 6c 24 18 48 8d 05 3c 2b 04 00 48 89 44 24 08 48 8b 44 24 28
48 89 44 24 10 48 8d 44 24 08 48 89 04 24 e8 4f 57 04 00 <48> 8b 6c 24 18
48 83 c4 20 c3 e8 90 58 04 00 eb ae cc cc cc cc cc
RSP: 002b:00007f2455cc27a0 EFLAGS: 00000293 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000004146b1
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 00007f2455cc27d0
RBP: 000000000075bfc8 R08: 0000000000000000 R09: 000000000000000e
R10: 0000000000000064 R11: 0000000000000293 R12: 00007f2455cc36d4
R13: 00000000004cb067 R14: 00000000004e4738 R15: 00000000ffffffff
Showing all locks held in the system:
1 lock held by khungtaskd/1112:
#0: ffffffff899a5680 (rcu_read_lock){....}, at:
debug_show_all_locks+0x5f/0x279 kernel/locking/lockdep.c:5334
1 lock held by rsyslogd/9080:
#0: ffff888098d8ab20 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110
fs/file.c:801
2 locks held by getty/9171:
#0: ffff888093c28090 (&tty->ldisc_sem){++++}, at:
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340
#1: ffffc9000175b2e0 (&ldata->atomic_read_lock){+.+.}, at:
n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156
2 locks held by getty/9172:
#0: ffff8880a8e31090 (&tty->ldisc_sem){++++}, at:
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340
#1: ffffc9000173b2e0 (&ldata->atomic_read_lock){+.+.}, at:
n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156
2 locks held by getty/9173:
#0: ffff88809655b090 (&tty->ldisc_sem){++++}, at:
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340
#1: ffffc9000176b2e0 (&ldata->atomic_read_lock){+.+.}, at:
n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156
2 locks held by getty/9174:
#0: ffff8880a2d99090 (&tty->ldisc_sem){++++}, at:
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340
#1: ffffc900016cb2e0 (&ldata->atomic_read_lock){+.+.}, at:
n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156
2 locks held by getty/9175:
#0: ffff8880a2ff4090 (&tty->ldisc_sem){++++}, at:
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340
#1: ffffc9000174b2e0 (&ldata->atomic_read_lock){+.+.}, at:
n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156
2 locks held by getty/9176:
#0: ffff8882156f2090 (&tty->ldisc_sem){++++}, at:
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340
#1: ffffc900011202e0 (&ldata->atomic_read_lock){+.+.}, at:
n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156
2 locks held by getty/7654:
#0: ffff88805c8ef090 (&tty->ldisc_sem){++++}, at:
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340
#1: ffffc900078932e0 (&ldata->atomic_read_lock){+.+.}, at:
n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156
2 locks held by syz-executor.4/30304:
#0: ffffffff89eceb20 (tty_mutex){+.+.}, at: tty_open_by_driver
drivers/tty/tty_io.c:1951 [inline]
#0: ffffffff89eceb20 (tty_mutex){+.+.}, at: tty_open+0x3cb/0xbb0
drivers/tty/tty_io.c:2035
#1: ffff88809fb0d198 (&tty->legacy_mutex){+.+.}, at: tty_lock+0xc7/0x130
drivers/tty/tty_mutex.c:19
1 lock held by syz-executor.2/30294:
1 lock held by syz-executor.1/30305:
#0: ffffffff89eceb20 (tty_mutex){+.+.}, at: tty_open_by_driver
drivers/tty/tty_io.c:1951 [inline]
#0: ffffffff89eceb20 (tty_mutex){+.+.}, at: tty_open+0x3cb/0xbb0
drivers/tty/tty_io.c:2035
1 lock held by syz-executor.3/30397:
#0: ffffffff89eceb20 (tty_mutex){+.+.}, at: tty_open_by_driver
drivers/tty/tty_io.c:1951 [inline]
#0: ffffffff89eceb20 (tty_mutex){+.+.}, at: tty_open+0x3cb/0xbb0
drivers/tty/tty_io.c:2035
1 lock held by syz-executor.3/30508:
#0: ffffffff89eceb20 (tty_mutex){+.+.}, at: tty_open_by_driver
drivers/tty/tty_io.c:1951 [inline]
#0: ffffffff89eceb20 (tty_mutex){+.+.}, at: tty_open+0x3cb/0xbb0
drivers/tty/tty_io.c:2035
1 lock held by syz-executor.5/30847:
#0: ffffffff89eceb20 (tty_mutex){+.+.}, at: tty_open_by_driver
drivers/tty/tty_io.c:1951 [inline]
#0: ffffffff89eceb20 (tty_mutex){+.+.}, at: tty_open+0x3cb/0xbb0
drivers/tty/tty_io.c:2035
1 lock held by syz-executor.5/30861:
#0: ffffffff89eceb20 (tty_mutex){+.+.}, at: tty_open_by_driver
drivers/tty/tty_io.c:1951 [inline]
#0: ffffffff89eceb20 (tty_mutex){+.+.}, at: tty_open+0x3cb/0xbb0
drivers/tty/tty_io.c:2035
=============================================
NMI backtrace for cpu 0
CPU: 0 PID: 1112 Comm: khungtaskd Not tainted 5.5.0-rc4-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 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 30294 Comm: syz-executor.2 Not tainted 5.5.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
RIP: 0010:__sanitizer_cov_trace_pc+0x1/0x50 kernel/kcov.c:180
Code: cc cc cc cc cc cc cc cc cc 65 48 8b 04 25 c0 1e 02 00 48 8b 80 98 13
00 00 c3 0f 1f 44 00 00 66 2e 0f 1f 84 00 00 00 00 00 55 <48> 89 e5 65 48
8b 04 25 c0 1e 02 00 65 8b 15 84 f0 8c 7e 81 e2 00
RSP: 0018:ffffc900071375c0 EFLAGS: 00000246
RAX: 0000000000000002 RBX: 0000000000000000 RCX: ffffffff83b4fb70
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005
RBP: ffffc90007137610 R08: ffff88805bfc80c0 R09: 0000000000000040
R10: fffffbfff14f33af R11: ffffffff8a799d7b R12: 0000000000001400
R13: 0000000000000040 R14: ffff8880000a0000 R15: 0000000000000000
FS: 00007f8228648700(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8bedbd8000 CR3: 00000000a28f9000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
cfb_fillrect+0x423/0x7c0 drivers/video/fbdev/core/cfbfillrect.c:327
vga16fb_fillrect+0x6ce/0x19b0 drivers/video/fbdev/vga16fb.c:951
bit_clear_margins+0x30b/0x530 drivers/video/fbdev/core/bitblit.c:232
fbcon_clear_margins+0x1e9/0x250 drivers/video/fbdev/core/fbcon.c:1372
fbcon_do_set_font+0x81f/0x960 drivers/video/fbdev/core/fbcon.c:2604
fbcon_set_font+0x72e/0x860 drivers/video/fbdev/core/fbcon.c:2696
con_font_set drivers/tty/vt/vt.c:4538 [inline]
con_font_op+0xe30/0x1270 drivers/tty/vt/vt.c:4603
vt_ioctl+0xd2e/0x26d0 drivers/tty/vt/vt_ioctl.c:913
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: 0033:0x45a919
Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f8228647c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045a919
RDX: 0000000020000100 RSI: 0000000000004b61 RDI: 0000000000000003
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f82286486d4
R13: 00000000004c5c8b R14: 00000000004dc080 R15: 00000000ffffffff
---
This bug is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.
syzbot will keep track of this bug report. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
syzbot found the following crash on:
HEAD commit: fd698849 Linux 5.5-rc4
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1170c085e00000
kernel config: https://syzkaller.appspot.com/x/.config?x=874bac2ff63646fa
dashboard link: https://syzkaller.appspot.com/bug?extid=370b0e19c5405cfd7173
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
Unfortunately, I don't have any reproducer for this crash yet.
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+370b0e...@syzkaller.appspotmail.com
INFO: task syz-executor.4:30304 blocked for more than 143 seconds.
Not tainted 5.5.0-rc4-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.4 D28552 30304 9223 0x00000004
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_common kernel/locking/semaphore.c:220 [inline]
__down+0x176/0x2c0 kernel/locking/semaphore.c:237
down+0x64/0x90 kernel/locking/semaphore.c:61
console_lock+0x29/0x80 kernel/printk/printk.c:2289
con_install+0x4a/0x410 drivers/tty/vt/vt.c:3228
tty_driver_install_tty drivers/tty/tty_io.c:1228 [inline]
tty_init_dev drivers/tty/tty_io.c:1341 [inline]
tty_init_dev+0xf9/0x470 drivers/tty/tty_io.c:1318
tty_open_by_driver drivers/tty/tty_io.c:1987 [inline]
tty_open+0x4a5/0xbb0 drivers/tty/tty_io.c:2035
chrdev_open+0x245/0x6b0 fs/char_dev.c:414
do_dentry_open+0x4e6/0x1380 fs/open.c:797
vfs_open+0xa0/0xd0 fs/open.c:914
do_last fs/namei.c:3420 [inline]
path_openat+0x10df/0x4500 fs/namei.c:3537
do_filp_open+0x1a1/0x280 fs/namei.c:3567
do_sys_open+0x3fe/0x5d0 fs/open.c:1097
__do_sys_open fs/open.c:1115 [inline]
__se_sys_open fs/open.c:1110 [inline]
__x64_sys_open+0x7e/0xc0 fs/open.c:1110
do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4146b1
Code: 18 48 8d 6c 24 18 48 8d 05 3c 2b 04 00 48 89 44 24 08 48 8b 44 24 28
48 89 44 24 10 48 8d 44 24 08 48 89 04 24 e8 4f 57 04 00 <48> 8b 6c 24 18
48 83 c4 20 c3 e8 90 58 04 00 eb ae cc cc cc cc cc
RSP: 002b:00007fd6e11307a0 EFLAGS: 00000293 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000004146b1
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 00007fd6e11307d0
RBP: 000000000075bf20 R08: 0000000000000000 R09: 000000000000000e
R10: 0000000000000064 R11: 0000000000000293 R12: 00007fd6e11316d4
R13: 00000000004cb17d R14: 00000000004e4888 R15: 00000000ffffffff
INFO: task syz-executor.1:30305 blocked for more than 143 seconds.
Not tainted 5.5.0-rc4-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.1 D28552 30305 9214 0x00004004
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_preempt_disabled+0x13/0x20 kernel/sched/core.c:4214
__mutex_lock_common kernel/locking/mutex.c:1033 [inline]
__mutex_lock+0x7ab/0x13c0 kernel/locking/mutex.c:1103
mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1118
tty_open_by_driver drivers/tty/tty_io.c:1951 [inline]
tty_open+0x3cb/0xbb0 drivers/tty/tty_io.c:2035
chrdev_open+0x245/0x6b0 fs/char_dev.c:414
do_dentry_open+0x4e6/0x1380 fs/open.c:797
vfs_open+0xa0/0xd0 fs/open.c:914
do_last fs/namei.c:3420 [inline]
path_openat+0x10df/0x4500 fs/namei.c:3537
do_filp_open+0x1a1/0x280 fs/namei.c:3567
do_sys_open+0x3fe/0x5d0 fs/open.c:1097
__do_sys_open fs/open.c:1115 [inline]
__se_sys_open fs/open.c:1110 [inline]
__x64_sys_open+0x7e/0xc0 fs/open.c:1110
do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4146b1
Code: 18 48 8d 6c 24 18 48 8d 05 3c 2b 04 00 48 89 44 24 08 48 8b 44 24 28
48 89 44 24 10 48 8d 44 24 08 48 89 04 24 e8 4f 57 04 00 <48> 8b 6c 24 18
48 83 c4 20 c3 e8 90 58 04 00 eb ae cc cc cc cc cc
RSP: 002b:00007fd548a717a0 EFLAGS: 00000293 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000004146b1
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 00007fd548a717d0
RBP: 000000000075bf20 R08: 0000000000000000 R09: 000000000000000e
R10: 0000000000000064 R11: 0000000000000293 R12: 00007fd548a726d4
R13: 00000000004cb17d R14: 00000000004e4888 R15: 00000000ffffffff
INFO: task syz-executor.3:30397 blocked for more than 143 seconds.
Not tainted 5.5.0-rc4-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.3 D28552 30397 9220 0x00004004
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_preempt_disabled+0x13/0x20 kernel/sched/core.c:4214
__mutex_lock_common kernel/locking/mutex.c:1033 [inline]
__mutex_lock+0x7ab/0x13c0 kernel/locking/mutex.c:1103
mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1118
tty_open_by_driver drivers/tty/tty_io.c:1951 [inline]
tty_open+0x3cb/0xbb0 drivers/tty/tty_io.c:2035
chrdev_open+0x245/0x6b0 fs/char_dev.c:414
do_dentry_open+0x4e6/0x1380 fs/open.c:797
vfs_open+0xa0/0xd0 fs/open.c:914
do_last fs/namei.c:3420 [inline]
path_openat+0x10df/0x4500 fs/namei.c:3537
do_filp_open+0x1a1/0x280 fs/namei.c:3567
do_sys_open+0x3fe/0x5d0 fs/open.c:1097
__do_sys_open fs/open.c:1115 [inline]
__se_sys_open fs/open.c:1110 [inline]
__x64_sys_open+0x7e/0xc0 fs/open.c:1110
do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4146b1
Code: 18 48 8d 6c 24 18 48 8d 05 3c 2b 04 00 48 89 44 24 08 48 8b 44 24 28
48 89 44 24 10 48 8d 44 24 08 48 89 04 24 e8 4f 57 04 00 <48> 8b 6c 24 18
48 83 c4 20 c3 e8 90 58 04 00 eb ae cc cc cc cc cc
RSP: 002b:00007efd38a3e7a0 EFLAGS: 00000293 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000004146b1
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 00007efd38a3e7d0
RBP: 000000000075bf20 R08: 0000000000000000 R09: 000000000000000e
R10: 0000000000000064 R11: 0000000000000293 R12: 00007efd38a3f6d4
R13: 00000000004cb17d R14: 00000000004e4888 R15: 00000000ffffffff
INFO: task syz-executor.3:30508 blocked for more than 143 seconds.
Not tainted 5.5.0-rc4-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.3 D28304 30508 9220 0x00000004
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_preempt_disabled+0x13/0x20 kernel/sched/core.c:4214
__mutex_lock_common kernel/locking/mutex.c:1033 [inline]
__mutex_lock+0x7ab/0x13c0 kernel/locking/mutex.c:1103
mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1118
tty_open_by_driver drivers/tty/tty_io.c:1951 [inline]
tty_open+0x3cb/0xbb0 drivers/tty/tty_io.c:2035
chrdev_open+0x245/0x6b0 fs/char_dev.c:414
do_dentry_open+0x4e6/0x1380 fs/open.c:797
vfs_open+0xa0/0xd0 fs/open.c:914
do_last fs/namei.c:3420 [inline]
path_openat+0x10df/0x4500 fs/namei.c:3537
do_filp_open+0x1a1/0x280 fs/namei.c:3567
do_sys_open+0x3fe/0x5d0 fs/open.c:1097
__do_sys_open fs/open.c:1115 [inline]
__se_sys_open fs/open.c:1110 [inline]
__x64_sys_open+0x7e/0xc0 fs/open.c:1110
do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4146b1
Code: 18 48 8d 6c 24 18 48 8d 05 3c 2b 04 00 48 89 44 24 08 48 8b 44 24 28
48 89 44 24 10 48 8d 44 24 08 48 89 04 24 e8 4f 57 04 00 <48> 8b 6c 24 18
48 83 c4 20 c3 e8 90 58 04 00 eb ae cc cc cc cc cc
RSP: 002b:00007efd38a1d7a0 EFLAGS: 00000293 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000004146b1
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 00007efd38a1d7d0
RBP: 000000000075bfc8 R08: 0000000000000000 R09: 000000000000000e
R10: 0000000000000064 R11: 0000000000000293 R12: 00007efd38a1e6d4
R13: 00000000004cb17d R14: 00000000004e4888 R15: 00000000ffffffff
INFO: task syz-executor.5:30847 blocked for more than 143 seconds.
Not tainted 5.5.0-rc4-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.5 D28552 30847 7317 0x00004004
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_preempt_disabled+0x13/0x20 kernel/sched/core.c:4214
__mutex_lock_common kernel/locking/mutex.c:1033 [inline]
__mutex_lock+0x7ab/0x13c0 kernel/locking/mutex.c:1103
mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1118
tty_open_by_driver drivers/tty/tty_io.c:1951 [inline]
tty_open+0x3cb/0xbb0 drivers/tty/tty_io.c:2035
chrdev_open+0x245/0x6b0 fs/char_dev.c:414
do_dentry_open+0x4e6/0x1380 fs/open.c:797
vfs_open+0xa0/0xd0 fs/open.c:914
do_last fs/namei.c:3420 [inline]
path_openat+0x10df/0x4500 fs/namei.c:3537
do_filp_open+0x1a1/0x280 fs/namei.c:3567
do_sys_open+0x3fe/0x5d0 fs/open.c:1097
__do_sys_open fs/open.c:1115 [inline]
__se_sys_open fs/open.c:1110 [inline]
__x64_sys_open+0x7e/0xc0 fs/open.c:1110
do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4146b1
Code: 18 48 8d 6c 24 18 48 8d 05 3c 2b 04 00 48 89 44 24 08 48 8b 44 24 28
48 89 44 24 10 48 8d 44 24 08 48 89 04 24 e8 4f 57 04 00 <48> 8b 6c 24 18
48 83 c4 20 c3 e8 90 58 04 00 eb ae cc cc cc cc cc
RSP: 002b:00007f2455ce37a0 EFLAGS: 00000293 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000004146b1
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 00007f2455ce37d0
RBP: 000000000075bf20 R08: 0000000000000000 R09: 000000000000000e
R10: 0000000000000064 R11: 0000000000000293 R12: 00007f2455ce46d4
R13: 00000000004cb067 R14: 00000000004e4738 R15: 00000000ffffffff
INFO: task syz-executor.5:30861 blocked for more than 143 seconds.
Not tainted 5.5.0-rc4-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.5 D28240 30861 7317 0x00000004
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_preempt_disabled+0x13/0x20 kernel/sched/core.c:4214
__mutex_lock_common kernel/locking/mutex.c:1033 [inline]
__mutex_lock+0x7ab/0x13c0 kernel/locking/mutex.c:1103
mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1118
tty_open_by_driver drivers/tty/tty_io.c:1951 [inline]
tty_open+0x3cb/0xbb0 drivers/tty/tty_io.c:2035
chrdev_open+0x245/0x6b0 fs/char_dev.c:414
do_dentry_open+0x4e6/0x1380 fs/open.c:797
vfs_open+0xa0/0xd0 fs/open.c:914
do_last fs/namei.c:3420 [inline]
path_openat+0x10df/0x4500 fs/namei.c:3537
do_filp_open+0x1a1/0x280 fs/namei.c:3567
do_sys_open+0x3fe/0x5d0 fs/open.c:1097
__do_sys_open fs/open.c:1115 [inline]
__se_sys_open fs/open.c:1110 [inline]
__x64_sys_open+0x7e/0xc0 fs/open.c:1110
do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4146b1
Code: 18 48 8d 6c 24 18 48 8d 05 3c 2b 04 00 48 89 44 24 08 48 8b 44 24 28
48 89 44 24 10 48 8d 44 24 08 48 89 04 24 e8 4f 57 04 00 <48> 8b 6c 24 18
48 83 c4 20 c3 e8 90 58 04 00 eb ae cc cc cc cc cc
RSP: 002b:00007f2455cc27a0 EFLAGS: 00000293 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000004146b1
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 00007f2455cc27d0
RBP: 000000000075bfc8 R08: 0000000000000000 R09: 000000000000000e
R10: 0000000000000064 R11: 0000000000000293 R12: 00007f2455cc36d4
R13: 00000000004cb067 R14: 00000000004e4738 R15: 00000000ffffffff
Showing all locks held in the system:
1 lock held by khungtaskd/1112:
#0: ffffffff899a5680 (rcu_read_lock){....}, at:
debug_show_all_locks+0x5f/0x279 kernel/locking/lockdep.c:5334
1 lock held by rsyslogd/9080:
#0: ffff888098d8ab20 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110
fs/file.c:801
2 locks held by getty/9171:
#0: ffff888093c28090 (&tty->ldisc_sem){++++}, at:
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340
#1: ffffc9000175b2e0 (&ldata->atomic_read_lock){+.+.}, at:
n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156
2 locks held by getty/9172:
#0: ffff8880a8e31090 (&tty->ldisc_sem){++++}, at:
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340
#1: ffffc9000173b2e0 (&ldata->atomic_read_lock){+.+.}, at:
n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156
2 locks held by getty/9173:
#0: ffff88809655b090 (&tty->ldisc_sem){++++}, at:
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340
#1: ffffc9000176b2e0 (&ldata->atomic_read_lock){+.+.}, at:
n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156
2 locks held by getty/9174:
#0: ffff8880a2d99090 (&tty->ldisc_sem){++++}, at:
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340
#1: ffffc900016cb2e0 (&ldata->atomic_read_lock){+.+.}, at:
n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156
2 locks held by getty/9175:
#0: ffff8880a2ff4090 (&tty->ldisc_sem){++++}, at:
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340
#1: ffffc9000174b2e0 (&ldata->atomic_read_lock){+.+.}, at:
n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156
2 locks held by getty/9176:
#0: ffff8882156f2090 (&tty->ldisc_sem){++++}, at:
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340
#1: ffffc900011202e0 (&ldata->atomic_read_lock){+.+.}, at:
n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156
2 locks held by getty/7654:
#0: ffff88805c8ef090 (&tty->ldisc_sem){++++}, at:
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340
#1: ffffc900078932e0 (&ldata->atomic_read_lock){+.+.}, at:
n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156
2 locks held by syz-executor.4/30304:
#0: ffffffff89eceb20 (tty_mutex){+.+.}, at: tty_open_by_driver
drivers/tty/tty_io.c:1951 [inline]
#0: ffffffff89eceb20 (tty_mutex){+.+.}, at: tty_open+0x3cb/0xbb0
drivers/tty/tty_io.c:2035
#1: ffff88809fb0d198 (&tty->legacy_mutex){+.+.}, at: tty_lock+0xc7/0x130
drivers/tty/tty_mutex.c:19
1 lock held by syz-executor.2/30294:
1 lock held by syz-executor.1/30305:
#0: ffffffff89eceb20 (tty_mutex){+.+.}, at: tty_open_by_driver
drivers/tty/tty_io.c:1951 [inline]
#0: ffffffff89eceb20 (tty_mutex){+.+.}, at: tty_open+0x3cb/0xbb0
drivers/tty/tty_io.c:2035
1 lock held by syz-executor.3/30397:
#0: ffffffff89eceb20 (tty_mutex){+.+.}, at: tty_open_by_driver
drivers/tty/tty_io.c:1951 [inline]
#0: ffffffff89eceb20 (tty_mutex){+.+.}, at: tty_open+0x3cb/0xbb0
drivers/tty/tty_io.c:2035
1 lock held by syz-executor.3/30508:
#0: ffffffff89eceb20 (tty_mutex){+.+.}, at: tty_open_by_driver
drivers/tty/tty_io.c:1951 [inline]
#0: ffffffff89eceb20 (tty_mutex){+.+.}, at: tty_open+0x3cb/0xbb0
drivers/tty/tty_io.c:2035
1 lock held by syz-executor.5/30847:
#0: ffffffff89eceb20 (tty_mutex){+.+.}, at: tty_open_by_driver
drivers/tty/tty_io.c:1951 [inline]
#0: ffffffff89eceb20 (tty_mutex){+.+.}, at: tty_open+0x3cb/0xbb0
drivers/tty/tty_io.c:2035
1 lock held by syz-executor.5/30861:
#0: ffffffff89eceb20 (tty_mutex){+.+.}, at: tty_open_by_driver
drivers/tty/tty_io.c:1951 [inline]
#0: ffffffff89eceb20 (tty_mutex){+.+.}, at: tty_open+0x3cb/0xbb0
drivers/tty/tty_io.c:2035
=============================================
NMI backtrace for cpu 0
CPU: 0 PID: 1112 Comm: khungtaskd Not tainted 5.5.0-rc4-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 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 30294 Comm: syz-executor.2 Not tainted 5.5.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
RIP: 0010:__sanitizer_cov_trace_pc+0x1/0x50 kernel/kcov.c:180
Code: cc cc cc cc cc cc cc cc cc 65 48 8b 04 25 c0 1e 02 00 48 8b 80 98 13
00 00 c3 0f 1f 44 00 00 66 2e 0f 1f 84 00 00 00 00 00 55 <48> 89 e5 65 48
8b 04 25 c0 1e 02 00 65 8b 15 84 f0 8c 7e 81 e2 00
RSP: 0018:ffffc900071375c0 EFLAGS: 00000246
RAX: 0000000000000002 RBX: 0000000000000000 RCX: ffffffff83b4fb70
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005
RBP: ffffc90007137610 R08: ffff88805bfc80c0 R09: 0000000000000040
R10: fffffbfff14f33af R11: ffffffff8a799d7b R12: 0000000000001400
R13: 0000000000000040 R14: ffff8880000a0000 R15: 0000000000000000
FS: 00007f8228648700(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8bedbd8000 CR3: 00000000a28f9000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
cfb_fillrect+0x423/0x7c0 drivers/video/fbdev/core/cfbfillrect.c:327
vga16fb_fillrect+0x6ce/0x19b0 drivers/video/fbdev/vga16fb.c:951
bit_clear_margins+0x30b/0x530 drivers/video/fbdev/core/bitblit.c:232
fbcon_clear_margins+0x1e9/0x250 drivers/video/fbdev/core/fbcon.c:1372
fbcon_do_set_font+0x81f/0x960 drivers/video/fbdev/core/fbcon.c:2604
fbcon_set_font+0x72e/0x860 drivers/video/fbdev/core/fbcon.c:2696
con_font_set drivers/tty/vt/vt.c:4538 [inline]
con_font_op+0xe30/0x1270 drivers/tty/vt/vt.c:4603
vt_ioctl+0xd2e/0x26d0 drivers/tty/vt/vt_ioctl.c:913
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: 0033:0x45a919
Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f8228647c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045a919
RDX: 0000000020000100 RSI: 0000000000004b61 RDI: 0000000000000003
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f82286486d4
R13: 00000000004c5c8b R14: 00000000004dc080 R15: 00000000ffffffff
---
This bug is generated by a bot. It may contain errors.
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