syzbot


INFO: task hung in paste_selection

Status: fixed on 2020/03/26 13:10
Reported-by: syzbot+967f1c0f38a4f63e13c1@syzkaller.appspotmail.com
Fix commit: b4492f1e7456 vt: selection, push sel_lock up
First crash: 1594d, last: 1519d
Fix bisection: fixed by (bisect log) :
commit b4492f1e7456bd162714c0ec2815c2749d930844
Author: Jiri Slaby <jslaby@suse.cz>
Date: Fri Feb 28 11:54:06 2020 +0000

  vt: selection, push sel_lock up

  
Similar bugs (5)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream INFO: task hung in paste_selection (2) serial C inconclusive error 6 71d 978d 0/26 upstream: reported C repro on 2021/08/19 03:38
upstream INFO: task hung in paste_selection serial C inconclusive done 8 1535d 1600d 15/26 fixed on 2020/04/15 17:19
linux-4.14 INFO: task hung in paste_selection (3) 1 1185d 1185d 0/1 auto-closed as invalid on 2021/05/24 08:55
linux-4.14 INFO: task hung in paste_selection (2) 1 1377d 1377d 0/1 auto-closed as invalid on 2020/11/12 23:24
linux-4.14 INFO: task hung in paste_selection C done 8 1519d 1594d 1/1 fixed on 2020/03/27 08:38

Sample crash report:
INFO: task syz-executor077:12368 blocked for more than 140 seconds.
      Not tainted 4.19.106-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor077 D28216 12368   8129 0x00000004
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_preempt_disabled+0x13/0x20 kernel/sched/core.c:3617
 __mutex_lock_common kernel/locking/mutex.c:1002 [inline]
 __mutex_lock+0x726/0x1300 kernel/locking/mutex.c:1072
 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087
 tty_buffer_lock_exclusive+0x30/0x40 drivers/tty/tty_buffer.c:61
 paste_selection+0x11d/0x443 drivers/tty/vt/selection.c:348
 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: 0033:0x441339
Code: e8 ac e8 ff ff 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 eb 08 fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fff40ce15e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441339
RDX: 0000000020000000 RSI: 000000000000541c RDI: 0000000000000004
RBP: 00000000000d6104 R08: 000000000000000d R09: 00000000004002c8
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004020b0
R13: 0000000000402140 R14: 0000000000000000 R15: 0000000000000000
INFO: task syz-executor077:12369 blocked for more than 140 seconds.
      Not tainted 4.19.106-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor077 D28216 12369   8133 0x00000004
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_preempt_disabled+0x13/0x20 kernel/sched/core.c:3617
 __mutex_lock_common kernel/locking/mutex.c:1002 [inline]
 __mutex_lock+0x726/0x1300 kernel/locking/mutex.c:1072
 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087
 tty_buffer_lock_exclusive+0x30/0x40 drivers/tty/tty_buffer.c:61
 paste_selection+0x11d/0x443 drivers/tty/vt/selection.c:348
 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: 0033:0x441339
Code: e8 ac e8 ff ff 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 eb 08 fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fff40ce15e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441339
RDX: 0000000020000000 RSI: 000000000000541c RDI: 0000000000000004
RBP: 00000000000d60fc R08: 000000000000000d R09: 00000000004002c8
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004020b0
R13: 0000000000402140 R14: 0000000000000000 R15: 0000000000000000
INFO: task syz-executor077:12370 blocked for more than 140 seconds.
      Not tainted 4.19.106-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor077 D27808 12370   8131 0x00000004
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_preempt_disabled+0x13/0x20 kernel/sched/core.c:3617
 __mutex_lock_common kernel/locking/mutex.c:1002 [inline]
 __mutex_lock+0x726/0x1300 kernel/locking/mutex.c:1072
 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087
 tty_buffer_lock_exclusive+0x30/0x40 drivers/tty/tty_buffer.c:61
 paste_selection+0x11d/0x443 drivers/tty/vt/selection.c:348
 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: 0033:0x441339
Code: e8 ac e8 ff ff 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 eb 08 fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fff40ce15e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441339
RDX: 0000000020000000 RSI: 000000000000541c RDI: 0000000000000004
RBP: 00000000000d6118 R08: 000000000000000d R09: 00000000004002c8
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004020b0
R13: 0000000000402140 R14: 0000000000000000 R15: 0000000000000000
INFO: task syz-executor077:12371 blocked for more than 140 seconds.
      Not tainted 4.19.106-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor077 D28216 12371   8130 0x00000004
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_preempt_disabled+0x13/0x20 kernel/sched/core.c:3617
 __mutex_lock_common kernel/locking/mutex.c:1002 [inline]
 __mutex_lock+0x726/0x1300 kernel/locking/mutex.c:1072
 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087
 tty_buffer_lock_exclusive+0x30/0x40 drivers/tty/tty_buffer.c:61
 paste_selection+0x11d/0x443 drivers/tty/vt/selection.c:348
 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: 0033:0x441339
Code: e8 ac e8 ff ff 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 eb 08 fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fff40ce15e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441339
RDX: 0000000020000000 RSI: 000000000000541c RDI: 0000000000000004
RBP: 00000000000d610d R08: 000000000000000d R09: 00000000004002c8
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004020b0
R13: 0000000000402140 R14: 0000000000000000 R15: 0000000000000000
INFO: task syz-executor077:12372 blocked for more than 140 seconds.
      Not tainted 4.19.106-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor077 D28216 12372   8128 0x00000004
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_preempt_disabled+0x13/0x20 kernel/sched/core.c:3617
 __mutex_lock_common kernel/locking/mutex.c:1002 [inline]
 __mutex_lock+0x726/0x1300 kernel/locking/mutex.c:1072
 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087
 tty_buffer_lock_exclusive+0x30/0x40 drivers/tty/tty_buffer.c:61
 paste_selection+0x11d/0x443 drivers/tty/vt/selection.c:348
 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: 0033:0x441339
Code: e8 ac e8 ff ff 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 eb 08 fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fff40ce15e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441339
RDX: 0000000020000000 RSI: 000000000000541c RDI: 0000000000000004
RBP: 00000000000d6119 R08: 000000000000000d R09: 00000000004002c8
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004020b0
R13: 0000000000402140 R14: 0000000000000000 R15: 0000000000000000

Showing all locks held in the system:
1 lock held by khungtaskd/1079:
 #0: 00000000918f6f5d (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x27e kernel/locking/lockdep.c:4438
1 lock held by rsyslogd/7981:
 #0: 000000006b3ae0b9 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110 fs/file.c:767
5 locks held by getty/8103:
2 locks held by getty/8104:
 #0: 000000007280397e (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:362
 #1: 00000000615fd4a6 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2154
2 locks held by getty/8105:
 #0: 0000000012c55922 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:362
 #1: 0000000036792d62 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2154
2 locks held by getty/8106:
 #0: 0000000093f9ee33 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:362
 #1: 0000000006c63f02 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2154
2 locks held by getty/8107:
 #0: 00000000f0b6a8ef (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:362
 #1: 0000000018ad429e (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2154
2 locks held by getty/8108:
 #0: 00000000bdf9baf3 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:362
 #1: 000000006609f09a (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2154
2 locks held by getty/8109:
 #0: 0000000056da335a (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:362
 #1: 000000004fd20dbe (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2154
2 locks held by syz-executor077/12367:
2 locks held by syz-executor077/12368:
 #0: 00000000be3cfe3b (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:362
 #1: 00000000bc9c7a05 (&buf->lock){+.+.}, at: tty_buffer_lock_exclusive+0x30/0x40 drivers/tty/tty_buffer.c:61
2 locks held by syz-executor077/12369:
 #0: 00000000be3cfe3b (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:362
 #1: 00000000bc9c7a05 (&buf->lock){+.+.}, at: tty_buffer_lock_exclusive+0x30/0x40 drivers/tty/tty_buffer.c:61
2 locks held by syz-executor077/12370:
 #0: 00000000be3cfe3b (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:362
 #1: 00000000bc9c7a05 (&buf->lock){+.+.}, at: tty_buffer_lock_exclusive+0x30/0x40 drivers/tty/tty_buffer.c:61
2 locks held by syz-executor077/12371:
 #0: 00000000be3cfe3b (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:362
 #1: 00000000bc9c7a05 (&buf->lock){+.+.}, at: tty_buffer_lock_exclusive+0x30/0x40 drivers/tty/tty_buffer.c:61
2 locks held by syz-executor077/12372:
 #0: 00000000be3cfe3b (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:362
 #1: 00000000bc9c7a05 (&buf->lock){+.+.}, at: tty_buffer_lock_exclusive+0x30/0x40 drivers/tty/tty_buffer.c:61

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

NMI backtrace for cpu 1
CPU: 1 PID: 1079 Comm: khungtaskd Not tainted 4.19.106-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 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 8103 Comm: getty Not tainted 4.19.106-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:slow_down_io arch/x86/include/asm/paravirt.h:268 [inline]
RIP: 0010:outb_p arch/x86/include/asm/io.h:333 [inline]
RIP: 0010:vga_io_w include/video/vga.h:209 [inline]
RIP: 0010:setmask drivers/video/fbdev/vga16fb.c:139 [inline]
RIP: 0010:vga_imageblit_expand drivers/video/fbdev/vga16fb.c:1167 [inline]
RIP: 0010:vga16fb_imageblit+0x9f6/0x2200 drivers/video/fbdev/vga16fb.c:1260
Code: 88 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 91 15 00 00 ff 15 a5 33 63 05 b8 ff ff ff ff ba cf 03 00 00 ee <48> c7 c2 10 55 f2 88 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 80
RSP: 0018:ffff888099677220 EFLAGS: 00000246
RAX: 00000000ffffffff RBX: 0000000000000007 RCX: ffffffff838f1ed8
RDX: 00000000000003cf RSI: ffffffff838f1ee6 RDI: ffff8880996773d8
RBP: ffff8880996772b8 R08: ffff8880a03be1c0 R09: 000000000000001d
R10: ffffed1014a9cdc7 R11: ffff8880a54e6e3f R12: ffff8880996773cc
R13: ffff8880996773c8 R14: ffff8880a54adea0 R15: 0000000000000001
FS:  00007fbf98f0f700(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fbf98f14000 CR3: 00000000a8970000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 bit_putcs_unaligned drivers/video/fbdev/core/bitblit.c:139 [inline]
 bit_putcs+0x9a3/0xf10 drivers/video/fbdev/core/bitblit.c:188
 fbcon_putcs+0x42b/0x4f0 drivers/video/fbdev/core/fbcon.c:1320
 fbcon_redraw.isra.0+0x291/0x490 drivers/video/fbdev/core/fbcon.c:1783
 fbcon_scroll+0xbae/0x3780 drivers/video/fbdev/core/fbcon.c:1936
 con_scroll+0x5b4/0x6b0 drivers/tty/vt/vt.c:631
 lf+0x285/0x2e0 drivers/tty/vt/vt.c:1454
 do_con_trol+0x605/0x6070 drivers/tty/vt/vt.c:2122
 do_con_write.part.0+0xfd5/0x1eb0 drivers/tty/vt/vt.c:2773
 do_con_write drivers/tty/vt/vt.c:2541 [inline]
 con_write+0x46/0xd0 drivers/tty/vt/vt.c:3110
 do_output_char+0x5f7/0x880 drivers/tty/n_tty.c:445
 process_output drivers/tty/n_tty.c:512 [inline]
 n_tty_write+0x4b5/0x1140 drivers/tty/n_tty.c:2343
 do_tty_write drivers/tty/tty_io.c:960 [inline]
 tty_write+0x458/0x7a0 drivers/tty/tty_io.c:1044
 __vfs_write+0x114/0x810 fs/read_write.c:485
 vfs_write+0x20c/0x560 fs/read_write.c:549
 ksys_write+0x14f/0x2d0 fs/read_write.c:599
 __do_sys_write fs/read_write.c:611 [inline]
 __se_sys_write fs/read_write.c:608 [inline]
 __x64_sys_write+0x73/0xb0 fs/read_write.c:608
 do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7fbf9883a370
Code: 73 01 c3 48 8b 0d c8 4a 2b 00 31 d2 48 29 c2 64 89 11 48 83 c8 ff eb ea 90 90 83 3d 85 a2 2b 00 00 75 10 b8 01 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 0e 8a 01 00 48 89 04 24
RSP: 002b:00007ffc0e0d0b88 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000607340 RCX: 00007fbf9883a370
RDX: 0000000000000002 RSI: 00000000004059fb RDI: 0000000000000001
RBP: 0000000000000002 R08: 000000000000000a R09: 00007fbf98f0f700
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffc0e0d16e0
R13: 00007fbf98f0f6a8 R14: 00000000004059fb R15: 0000000000000000

Crashes (10):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2020/02/25 09:17 linux-4.19.y f25804f38984 59b57593 .config console log report syz C ci2-linux-4-19
2020/01/31 20:16 linux-4.19.y 7cdefde351b6 0eb59c27 .config console log report ci2-linux-4-19
2020/01/26 16:19 linux-4.19.y d183c8e2647a dd56146d .config console log report ci2-linux-4-19
2020/01/09 05:08 linux-4.19.y 3d40d7117e35 ddc3e859 .config console log report ci2-linux-4-19
2019/12/30 16:46 linux-4.19.y 672481c2deff 6b36d338 .config console log report ci2-linux-4-19
2019/12/23 20:55 linux-4.19.y 672481c2deff be5c2c81 .config console log report ci2-linux-4-19
2019/12/18 19:18 linux-4.19.y 7d120bf21c05 79b211f7 .config console log report ci2-linux-4-19
2019/12/18 13:13 linux-4.19.y 7d120bf21c05 64ca0a37 .config console log report ci2-linux-4-19
2019/12/13 05:55 linux-4.19.y fb683b5e3f53 2a752b7c .config console log report ci2-linux-4-19
2019/12/11 22:15 linux-4.19.y fb683b5e3f53 0d368675 .config console log report ci2-linux-4-19
* Struck through repros no longer work on HEAD.