INFO: task hung in paste_selection
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syzbot
Dec 6, 2019, 4:39:08 AM12/6/19
to gre...@linuxfoundation.org, jsl...@suse.com, linux-...@vger.kernel.org, syzkall...@googlegroups.com
Hello,
syzbot found the following crash on:
HEAD commit: aedc0650 Merge tag 'for-linus' of git://git.kernel.org/pub..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1475090ee00000
kernel config: https://syzkaller.appspot.com/x/.config?x=1d189d07c6717979
dashboard link: https://syzkaller.appspot.com/bug?extid=a172213a651850d94cf2
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+a17221...@syzkaller.appspotmail.com
INFO: task syz-executor.5:13549 blocked for more than 143 seconds.
Not tainted 5.4.0-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.5 D28536 13549 8906 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:1036 [inline]
__mutex_lock+0x7ab/0x13c0 kernel/locking/mutex.c:1106
mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1121
tty_buffer_lock_exclusive+0x30/0x40 drivers/tty/tty_buffer.c:61
paste_selection+0x11d/0x460 drivers/tty/vt/selection.c:361
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: 0033:0x45a679
Code: Bad RIP value.
RSP: 002b:00007f044b9acc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045a679
RDX: 0000000020000180 RSI: 000000000000541c RDI: 0000000000000007
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f044b9ad6d4
R13: 00000000004c5962 R14: 00000000004dbb78 R15: 00000000ffffffff
Showing all locks held in the system:
1 lock held by khungtaskd/1088:
#0: ffffffff897a4080 (rcu_read_lock){....}, at:
debug_show_all_locks+0x5f/0x279 kernel/locking/lockdep.c:5334
1 lock held by rsyslogd/8764:
#0: ffff8880a94c53e0 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110
fs/file.c:801
2 locks held by getty/8855:
#0: ffff8880a691c090 (&tty->ldisc_sem){++++}, at:
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340
#1: ffff8880a691c118 (&tty->atomic_write_lock){+.+.}, at:
tty_write_lock+0x23/0x90 drivers/tty/tty_io.c:888
2 locks held by getty/8856:
#0: ffff88809d355090 (&tty->ldisc_sem){++++}, at:
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340
#1: ffffc9000182b2e0 (&ldata->atomic_read_lock){+.+.}, at:
n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156
2 locks held by getty/8857:
#0: ffff88809799b090 (&tty->ldisc_sem){++++}, at:
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340
#1: ffffc9000180b2e0 (&ldata->atomic_read_lock){+.+.}, at:
n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156
2 locks held by getty/8858:
#0: ffff88809535f090 (&tty->ldisc_sem){++++}, at:
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340
#1: ffffc900017fb2e0 (&ldata->atomic_read_lock){+.+.}, at:
n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156
2 locks held by getty/8859:
#0: ffff888096e67090 (&tty->ldisc_sem){++++}, at:
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340
#1: ffffc900017eb2e0 (&ldata->atomic_read_lock){+.+.}, at:
n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156
2 locks held by getty/8860:
#0: ffff8880a9088090 (&tty->ldisc_sem){++++}, at:
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340
#1: ffffc9000181b2e0 (&ldata->atomic_read_lock){+.+.}, at:
n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156
2 locks held by getty/8861:
#0: ffff88809a733090 (&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+0x232/0x1c10 drivers/tty/n_tty.c:2156
3 locks held by syz-executor.3/13496:
2 locks held by syz-executor.5/13549:
#0: ffff8880a691c090 (&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: 1088 Comm: khungtaskd Not tainted 5.4.0-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: 13496 Comm: syz-executor.3 Not tainted 5.4.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
RIP: 0010:in_lock_functions+0x17/0x20 kernel/locking/spinlock.c:398
Code: 0f 1f 00 c3 cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc 31 c0 48 81
ff 58 8a c6 87 72 0c 31 c0 48 81 ff fd 98 c6 87 0f 92 c0 <c3> cc cc cc cc
cc cc cc cc 55 48 89 e5 41 57 41 56 41 55 49 c7 c5
RSP: 0018:ffffc900018d7868 EFLAGS: 00000297
RAX: 0000000000000000 RBX: ffffffff87c56be5 RCX: 1ffffffff1685c9c
RDX: 0000000000000000 RSI: ffffffff83dd7b30 RDI: ffffffff87c56be5
RBP: ffffc900018d7880 R08: ffff888069fee1c0 R09: ffffed1014d2388d
R10: ffffed1014d2388c R11: ffff8880a691c467 R12: ffff888069fee1c0
R13: ffff888069fee1e4 R14: ffffed100d3fdc38 R15: 0000000000000001
FS: 00007f4190eb5700(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffff600400 CR3: 000000009b00e000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
schedule+0xd5/0x2b0 kernel/sched/core.c:4154
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: 0033:0x45a679
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:00007f4190eb4c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045a679
RDX: 0000000020000180 RSI: 000000000000541c RDI: 0000000000000007
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f4190eb56d4
R13: 00000000004c5962 R14: 00000000004dbb78 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: aedc0650 Merge tag 'for-linus' of git://git.kernel.org/pub..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1475090ee00000
kernel config: https://syzkaller.appspot.com/x/.config?x=1d189d07c6717979
dashboard link: https://syzkaller.appspot.com/bug?extid=a172213a651850d94cf2
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+a17221...@syzkaller.appspotmail.com
INFO: task syz-executor.5:13549 blocked for more than 143 seconds.
Not tainted 5.4.0-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.5 D28536 13549 8906 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:1036 [inline]
__mutex_lock+0x7ab/0x13c0 kernel/locking/mutex.c:1106
mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1121
tty_buffer_lock_exclusive+0x30/0x40 drivers/tty/tty_buffer.c:61
paste_selection+0x11d/0x460 drivers/tty/vt/selection.c:361
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: 0033:0x45a679
Code: Bad RIP value.
RSP: 002b:00007f044b9acc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045a679
RDX: 0000000020000180 RSI: 000000000000541c RDI: 0000000000000007
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f044b9ad6d4
R13: 00000000004c5962 R14: 00000000004dbb78 R15: 00000000ffffffff
Showing all locks held in the system:
1 lock held by khungtaskd/1088:
#0: ffffffff897a4080 (rcu_read_lock){....}, at:
debug_show_all_locks+0x5f/0x279 kernel/locking/lockdep.c:5334
1 lock held by rsyslogd/8764:
#0: ffff8880a94c53e0 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110
fs/file.c:801
2 locks held by getty/8855:
#0: ffff8880a691c090 (&tty->ldisc_sem){++++}, at:
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340
#1: ffff8880a691c118 (&tty->atomic_write_lock){+.+.}, at:
tty_write_lock+0x23/0x90 drivers/tty/tty_io.c:888
2 locks held by getty/8856:
#0: ffff88809d355090 (&tty->ldisc_sem){++++}, at:
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340
#1: ffffc9000182b2e0 (&ldata->atomic_read_lock){+.+.}, at:
n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156
2 locks held by getty/8857:
#0: ffff88809799b090 (&tty->ldisc_sem){++++}, at:
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340
#1: ffffc9000180b2e0 (&ldata->atomic_read_lock){+.+.}, at:
n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156
2 locks held by getty/8858:
#0: ffff88809535f090 (&tty->ldisc_sem){++++}, at:
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340
#1: ffffc900017fb2e0 (&ldata->atomic_read_lock){+.+.}, at:
n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156
2 locks held by getty/8859:
#0: ffff888096e67090 (&tty->ldisc_sem){++++}, at:
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340
#1: ffffc900017eb2e0 (&ldata->atomic_read_lock){+.+.}, at:
n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156
2 locks held by getty/8860:
#0: ffff8880a9088090 (&tty->ldisc_sem){++++}, at:
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340
#1: ffffc9000181b2e0 (&ldata->atomic_read_lock){+.+.}, at:
n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156
2 locks held by getty/8861:
#0: ffff88809a733090 (&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+0x232/0x1c10 drivers/tty/n_tty.c:2156
3 locks held by syz-executor.3/13496:
2 locks held by syz-executor.5/13549:
#0: ffff8880a691c090 (&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: 1088 Comm: khungtaskd Not tainted 5.4.0-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: 13496 Comm: syz-executor.3 Not tainted 5.4.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
RIP: 0010:in_lock_functions+0x17/0x20 kernel/locking/spinlock.c:398
Code: 0f 1f 00 c3 cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc 31 c0 48 81
ff 58 8a c6 87 72 0c 31 c0 48 81 ff fd 98 c6 87 0f 92 c0 <c3> cc cc cc cc
cc cc cc cc 55 48 89 e5 41 57 41 56 41 55 49 c7 c5
RSP: 0018:ffffc900018d7868 EFLAGS: 00000297
RAX: 0000000000000000 RBX: ffffffff87c56be5 RCX: 1ffffffff1685c9c
RDX: 0000000000000000 RSI: ffffffff83dd7b30 RDI: ffffffff87c56be5
RBP: ffffc900018d7880 R08: ffff888069fee1c0 R09: ffffed1014d2388d
R10: ffffed1014d2388c R11: ffff8880a691c467 R12: ffff888069fee1c0
R13: ffff888069fee1e4 R14: ffffed100d3fdc38 R15: 0000000000000001
FS: 00007f4190eb5700(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffff600400 CR3: 000000009b00e000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
schedule+0xd5/0x2b0 kernel/sched/core.c:4154
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: 0033:0x45a679
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:00007f4190eb4c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045a679
RDX: 0000000020000180 RSI: 000000000000541c RDI: 0000000000000007
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f4190eb56d4
R13: 00000000004c5962 R14: 00000000004dbb78 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
Dec 12, 2019, 4:32:10 AM12/12/19
to gre...@linuxfoundation.org, jsl...@suse.com, linux-...@vger.kernel.org, syzkall...@googlegroups.com
syzbot has found a reproducer for the following crash on:
HEAD commit: 687dec9b Merge tag 'erofs-for-5.5-rc2-fixes' of git://git...
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=107fee46e00000
kernel config: https://syzkaller.appspot.com/x/.config?x=79f79de2a27d3e3d
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=151c7646e00000
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+a17221...@syzkaller.appspotmail.com
INFO: task syz-executor608:13178 blocked for more than 143 seconds.
Not tainted 5.5.0-rc1-syzkaller #0
Code: e8 ac e8 ff ff 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7
RSP: 002b:00007ffdacd52ff8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441319
RDX: 0000000020000040 RSI: 000000000000541c RDI: 0000000000000004
RBP: 000000000007f769 R08: 000000000000000d R09: 00000000004002c8
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000402090
R13: 0000000000402120 R14: 0000000000000000 R15: 0000000000000000
INFO: task syz-executor608:13179 blocked for more than 143 seconds.
Not tainted 5.5.0-rc1-syzkaller #0
Code: e8 ac e8 ff ff 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7
RSP: 002b:00007ffdacd52ff8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441319
RDX: 0000000020000040 RSI: 000000000000541c RDI: 0000000000000004
RBP: 000000000007f777 R08: 000000000000000d R09: 00000000004002c8
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000402090
R13: 0000000000402120 R14: 0000000000000000 R15: 0000000000000000
INFO: task syz-executor608:13180 blocked for more than 143 seconds.
Not tainted 5.5.0-rc1-syzkaller #0
Code: e8 ac e8 ff ff 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7
RSP: 002b:00007ffdacd52ff8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441319
RDX: 0000000020000040 RSI: 000000000000541c RDI: 0000000000000004
RBP: 000000000007f781 R08: 000000000000000d R09: 00000000004002c8
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000402090
R13: 0000000000402120 R14: 0000000000000000 R15: 0000000000000000
INFO: task syz-executor608:13181 blocked for more than 143 seconds.
Not tainted 5.5.0-rc1-syzkaller #0
Code: e8 ac e8 ff ff 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7
RSP: 002b:00007ffdacd52ff8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441319
RDX: 0000000020000040 RSI: 000000000000541c RDI: 0000000000000004
RBP: 000000000007f780 R08: 000000000000000d R09: 00000000004002c8
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000402090
R13: 0000000000402120 R14: 0000000000000000 R15: 0000000000000000
INFO: task syz-executor608:13182 blocked for more than 143 seconds.
Not tainted 5.5.0-rc1-syzkaller #0
Code: e8 ac e8 ff ff 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7
RSP: 002b:00007ffdacd52ff8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441319
RDX: 0000000020000040 RSI: 000000000000541c RDI: 0000000000000004
RBP: 000000000007f78a R08: 000000000000000d R09: 00000000004002c8
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000402090
R13: 0000000000402120 R14: 0000000000000000 R15: 0000000000000000
Showing all locks held in the system:
1 lock held by khungtaskd/1108:
#0: ffffffff899a56c0 (rcu_read_lock){....}, at:
debug_show_all_locks+0x5f/0x279 kernel/locking/lockdep.c:5334
1 lock held by rsyslogd/8846:
#0: ffff88809ae4bae0 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110
fs/file.c:801
5 locks held by getty/8936:
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340
#1: ffffc9000184b2e0 (&ldata->atomic_read_lock){+.+.}, at:
n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340
#1: ffffc9000183b2e0 (&ldata->atomic_read_lock){+.+.}, at:
n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156
2 locks held by getty/8940:
#0: ffff8880a6d4b090 (&tty->ldisc_sem){++++}, at:
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340
#1: ffffc900017bb2e0 (&ldata->atomic_read_lock){+.+.}, at:
n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340
#1: ffffc9000178b2e0 (&ldata->atomic_read_lock){+.+.}, at:
n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156
2 locks held by syz-executor608/13177:
2 locks held by syz-executor608/13178:
#0: ffff888094651090 (&tty->ldisc_sem){++++}, at:
#0: ffff888094651090 (&tty->ldisc_sem){++++}, at:
#0: ffff888094651090 (&tty->ldisc_sem){++++}, at:
#0: ffff888094651090 (&tty->ldisc_sem){++++}, at:
#0: ffff888094651090 (&tty->ldisc_sem){++++}, at:
CPU: 0 PID: 1108 Comm: khungtaskd Not tainted 5.5.0-rc1-syzkaller #0
Code: 66 2e 0f 1f 84 00 00 00 00 00 68 03 ff ff ff e8 b6 f0 ff ff e8 41 24
00 00 e9 ab f1 ff ff 66 90 66 2e 0f 1f 84 00 00 00 00 00 <68> 02 ff ff ff
e8 96 f0 ff ff e8 61 1f 00 00 e9 8b f1 ff ff 66 90
RSP: 0018:ffffc90001d27788 EFLAGS: 00000082
RAX: 1ffffffff13266ad RBX: ffff8880a6e30600 RCX: 0000000000000006
RDX: dffffc0000000000 RSI: 0000000000000008 RDI: ffff8880a6e30e94
RBP: ffffc90001d277b8 R08: 1ffffffff1659db5 R09: fffffbfff1659db6
R10: fffffbfff1659db5 R11: ffffffff8b2cedaf R12: ffff8880ae937340
R13: ffff88808e9f2580 R14: 0000000000000000 R15: 0000000000000000
FS: 00007f428f28f700(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
finish_task_switch+0x147/0x750 kernel/sched/core.c:3224
context_switch kernel/sched/core.c:3388 [inline]
__schedule+0x93c/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_flush_chars drivers/tty/vt/vt.c:3212 [inline]
con_flush_chars drivers/tty/vt/vt.c:3204 [inline]
con_write+0x83/0xd0 drivers/tty/vt/vt.c:3136
process_output_block drivers/tty/n_tty.c:595 [inline]
n_tty_write+0x40e/0x1080 drivers/tty/n_tty.c:2333
do_tty_write drivers/tty/tty_io.c:962 [inline]
tty_write+0x496/0x7f0 drivers/tty/tty_io.c:1046
__vfs_write+0x8a/0x110 fs/read_write.c:494
vfs_write+0x268/0x5d0 fs/read_write.c:558
ksys_write+0x14f/0x290 fs/read_write.c:611
__do_sys_write fs/read_write.c:623 [inline]
__se_sys_write fs/read_write.c:620 [inline]
__x64_sys_write+0x73/0xb0 fs/read_write.c:620
do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7f428ebba370
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:00007ffc758b2218 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 00007f428ebba370
RDX: 0000000000000001 RSI: 00007f428ee6f823 RDI: 0000000000000001
RBP: 00007f428ee6f823 R08: 0000000000000065 R09: 00007f428f28f700
R10: 0000000000000022 R11: 0000000000000246 R12: 00007f428ee6f7a0
R13: 0000000000000001 R14: 00000000004059fb R15: 00007ffc758b2514
HEAD commit: 687dec9b Merge tag 'erofs-for-5.5-rc2-fixes' of git://git...
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=107fee46e00000
kernel config: https://syzkaller.appspot.com/x/.config?x=79f79de2a27d3e3d
dashboard link: https://syzkaller.appspot.com/bug?extid=a172213a651850d94cf2
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=108cc589e00000
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=151c7646e00000
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+a17221...@syzkaller.appspotmail.com
Not tainted 5.5.0-rc1-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor608 D28160 13178 8968 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:1036 [inline]
__mutex_lock+0x7ab/0x13c0 kernel/locking/mutex.c:1106
mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1121
tty_buffer_lock_exclusive+0x30/0x40 drivers/tty/tty_buffer.c:61
paste_selection+0x11d/0x460 drivers/tty/vt/selection.c:361
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: 0033:0x441319
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:1036 [inline]
__mutex_lock+0x7ab/0x13c0 kernel/locking/mutex.c:1106
mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1121
tty_buffer_lock_exclusive+0x30/0x40 drivers/tty/tty_buffer.c:61
paste_selection+0x11d/0x460 drivers/tty/vt/selection.c:361
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
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:00007ffdacd52ff8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441319
RDX: 0000000020000040 RSI: 000000000000541c RDI: 0000000000000004
RBP: 000000000007f769 R08: 000000000000000d R09: 00000000004002c8
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000402090
R13: 0000000000402120 R14: 0000000000000000 R15: 0000000000000000
INFO: task syz-executor608:13179 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.
syz-executor608 D28160 13179 8970 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:1036 [inline]
__mutex_lock+0x7ab/0x13c0 kernel/locking/mutex.c:1106
mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1121
tty_buffer_lock_exclusive+0x30/0x40 drivers/tty/tty_buffer.c:61
paste_selection+0x11d/0x460 drivers/tty/vt/selection.c:361
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: 0033:0x441319
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:1036 [inline]
__mutex_lock+0x7ab/0x13c0 kernel/locking/mutex.c:1106
mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1121
tty_buffer_lock_exclusive+0x30/0x40 drivers/tty/tty_buffer.c:61
paste_selection+0x11d/0x460 drivers/tty/vt/selection.c:361
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
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:00007ffdacd52ff8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441319
RDX: 0000000020000040 RSI: 000000000000541c RDI: 0000000000000004
RBP: 000000000007f777 R08: 000000000000000d R09: 00000000004002c8
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000402090
R13: 0000000000402120 R14: 0000000000000000 R15: 0000000000000000
INFO: task syz-executor608:13180 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.
syz-executor608 D28160 13180 8964 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:1036 [inline]
__mutex_lock+0x7ab/0x13c0 kernel/locking/mutex.c:1106
mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1121
tty_buffer_lock_exclusive+0x30/0x40 drivers/tty/tty_buffer.c:61
paste_selection+0x11d/0x460 drivers/tty/vt/selection.c:361
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: 0033:0x441319
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:1036 [inline]
__mutex_lock+0x7ab/0x13c0 kernel/locking/mutex.c:1106
mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1121
tty_buffer_lock_exclusive+0x30/0x40 drivers/tty/tty_buffer.c:61
paste_selection+0x11d/0x460 drivers/tty/vt/selection.c:361
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
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:00007ffdacd52ff8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441319
RDX: 0000000020000040 RSI: 000000000000541c RDI: 0000000000000004
RBP: 000000000007f781 R08: 000000000000000d R09: 00000000004002c8
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000402090
R13: 0000000000402120 R14: 0000000000000000 R15: 0000000000000000
INFO: task syz-executor608:13181 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.
syz-executor608 D28160 13181 8965 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:1036 [inline]
__mutex_lock+0x7ab/0x13c0 kernel/locking/mutex.c:1106
mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1121
tty_buffer_lock_exclusive+0x30/0x40 drivers/tty/tty_buffer.c:61
paste_selection+0x11d/0x460 drivers/tty/vt/selection.c:361
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: 0033:0x441319
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:1036 [inline]
__mutex_lock+0x7ab/0x13c0 kernel/locking/mutex.c:1106
mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1121
tty_buffer_lock_exclusive+0x30/0x40 drivers/tty/tty_buffer.c:61
paste_selection+0x11d/0x460 drivers/tty/vt/selection.c:361
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
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:00007ffdacd52ff8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441319
RDX: 0000000020000040 RSI: 000000000000541c RDI: 0000000000000004
RBP: 000000000007f780 R08: 000000000000000d R09: 00000000004002c8
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000402090
R13: 0000000000402120 R14: 0000000000000000 R15: 0000000000000000
INFO: task syz-executor608:13182 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.
syz-executor608 D28160 13182 8967 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:1036 [inline]
__mutex_lock+0x7ab/0x13c0 kernel/locking/mutex.c:1106
mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1121
tty_buffer_lock_exclusive+0x30/0x40 drivers/tty/tty_buffer.c:61
paste_selection+0x11d/0x460 drivers/tty/vt/selection.c:361
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: 0033:0x441319
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:1036 [inline]
__mutex_lock+0x7ab/0x13c0 kernel/locking/mutex.c:1106
mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1121
tty_buffer_lock_exclusive+0x30/0x40 drivers/tty/tty_buffer.c:61
paste_selection+0x11d/0x460 drivers/tty/vt/selection.c:361
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
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:00007ffdacd52ff8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441319
RDX: 0000000020000040 RSI: 000000000000541c RDI: 0000000000000004
RBP: 000000000007f78a R08: 000000000000000d R09: 00000000004002c8
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000402090
R13: 0000000000402120 R14: 0000000000000000 R15: 0000000000000000
Showing all locks held in the system:
#0: ffffffff899a56c0 (rcu_read_lock){....}, at:
debug_show_all_locks+0x5f/0x279 kernel/locking/lockdep.c:5334
1 lock held by rsyslogd/8846:
#0: ffff88809ae4bae0 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110
fs/file.c:801
5 locks held by getty/8936:
2 locks held by getty/8937:
#0: ffff888099c1d090 (&tty->ldisc_sem){++++}, at:
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340
#1: ffffc9000184b2e0 (&ldata->atomic_read_lock){+.+.}, at:
n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156
2 locks held by getty/8938:
#0: ffff88809f500090 (&tty->ldisc_sem){++++}, at:
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340
#1: ffffc9000183b2e0 (&ldata->atomic_read_lock){+.+.}, at:
n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156
2 locks held by getty/8939:
#0: ffff888095772090 (&tty->ldisc_sem){++++}, at:
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340
#1: ffffc9000182b2e0 (&ldata->atomic_read_lock){+.+.}, at:
n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156
#1: ffffc9000182b2e0 (&ldata->atomic_read_lock){+.+.}, at:
2 locks held by getty/8940:
#0: ffff8880a6d4b090 (&tty->ldisc_sem){++++}, at:
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340
#1: ffffc900017bb2e0 (&ldata->atomic_read_lock){+.+.}, at:
n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156
2 locks held by getty/8941:
#0: ffff8880a93c3090 (&tty->ldisc_sem){++++}, at:
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340
#1: ffffc9000181b2e0 (&ldata->atomic_read_lock){+.+.}, at:
n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156
#1: ffffc9000181b2e0 (&ldata->atomic_read_lock){+.+.}, at:
2 locks held by getty/8942:
#0: ffff8880a4853090 (&tty->ldisc_sem){++++}, at:
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340
#1: ffffc9000178b2e0 (&ldata->atomic_read_lock){+.+.}, at:
n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156
2 locks held by syz-executor608/13177:
2 locks held by syz-executor608/13178:
#0: ffff888094651090 (&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
2 locks held by syz-executor608/13179:
#1: ffff8880aa5bc0a8 (&buf->lock){+.+.}, at:
tty_buffer_lock_exclusive+0x30/0x40 drivers/tty/tty_buffer.c:61
#0: ffff888094651090 (&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
2 locks held by syz-executor608/13180:
#1: ffff8880aa5bc0a8 (&buf->lock){+.+.}, at:
tty_buffer_lock_exclusive+0x30/0x40 drivers/tty/tty_buffer.c:61
#0: ffff888094651090 (&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
2 locks held by syz-executor608/13181:
#1: ffff8880aa5bc0a8 (&buf->lock){+.+.}, at:
tty_buffer_lock_exclusive+0x30/0x40 drivers/tty/tty_buffer.c:61
#0: ffff888094651090 (&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
2 locks held by syz-executor608/13182:
#1: ffff8880aa5bc0a8 (&buf->lock){+.+.}, at:
tty_buffer_lock_exclusive+0x30/0x40 drivers/tty/tty_buffer.c:61
#0: ffff888094651090 (&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 0
#1: ffff8880aa5bc0a8 (&buf->lock){+.+.}, at:
tty_buffer_lock_exclusive+0x30/0x40 drivers/tty/tty_buffer.c:61
=============================================
CPU: 0 PID: 1108 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 0 to CPUs 1:
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
NMI backtrace for cpu 1
CPU: 1 PID: 8936 Comm: getty Not tainted 5.5.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
RIP: 0010:reschedule_interrupt+0x0/0x20 arch/x86/entry/entry_64.S:853
Google 01/01/2011
Code: 66 2e 0f 1f 84 00 00 00 00 00 68 03 ff ff ff e8 b6 f0 ff ff e8 41 24
00 00 e9 ab f1 ff ff 66 90 66 2e 0f 1f 84 00 00 00 00 00 <68> 02 ff ff ff
e8 96 f0 ff ff e8 61 1f 00 00 e9 8b f1 ff ff 66 90
RSP: 0018:ffffc90001d27788 EFLAGS: 00000082
RAX: 1ffffffff13266ad RBX: ffff8880a6e30600 RCX: 0000000000000006
RDX: dffffc0000000000 RSI: 0000000000000008 RDI: ffff8880a6e30e94
RBP: ffffc90001d277b8 R08: 1ffffffff1659db5 R09: fffffbfff1659db6
R10: fffffbfff1659db5 R11: ffffffff8b2cedaf R12: ffff8880ae937340
R13: ffff88808e9f2580 R14: 0000000000000000 R15: 0000000000000000
FS: 00007f428f28f700(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f428f294000 CR3: 00000000a7e2d000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
finish_lock_switch kernel/sched/core.c:3124 [inline]
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
finish_task_switch+0x147/0x750 kernel/sched/core.c:3224
context_switch kernel/sched/core.c:3388 [inline]
__schedule+0x93c/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_flush_chars drivers/tty/vt/vt.c:3212 [inline]
con_flush_chars drivers/tty/vt/vt.c:3204 [inline]
con_write+0x83/0xd0 drivers/tty/vt/vt.c:3136
process_output_block drivers/tty/n_tty.c:595 [inline]
n_tty_write+0x40e/0x1080 drivers/tty/n_tty.c:2333
do_tty_write drivers/tty/tty_io.c:962 [inline]
tty_write+0x496/0x7f0 drivers/tty/tty_io.c:1046
__vfs_write+0x8a/0x110 fs/read_write.c:494
vfs_write+0x268/0x5d0 fs/read_write.c:558
ksys_write+0x14f/0x290 fs/read_write.c:611
__do_sys_write fs/read_write.c:623 [inline]
__se_sys_write fs/read_write.c:620 [inline]
__x64_sys_write+0x73/0xb0 fs/read_write.c:620
do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7f428ebba370
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:00007ffc758b2218 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 00007f428ebba370
RDX: 0000000000000001 RSI: 00007f428ee6f823 RDI: 0000000000000001
RBP: 00007f428ee6f823 R08: 0000000000000065 R09: 00007f428f28f700
R10: 0000000000000022 R11: 0000000000000246 R12: 00007f428ee6f7a0
R13: 0000000000000001 R14: 00000000004059fb R15: 00007ffc758b2514
syzbot
Mar 16, 2020, 4:37:06 PM3/16/20
to gre...@linuxfoundation.org, jsl...@suse.com, jsl...@suse.cz, linux-...@vger.kernel.org, okash....@gmail.com, samuel....@ens-lyon.org, syzkall...@googlegroups.com
syzbot suspects this bug was fixed by commit:
commit e8c75a30a23c6ba63f4ef6895cbf41fd42f21aa2
Author: Jiri Slaby <jsl...@suse.cz>
Date: Fri Feb 28 11:54:06 2020 +0000
vt: selection, push sel_lock up
bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=14aada1de00000
start commit: ae4b064e Merge tag 'afs-fixes-20191211' of git://git.kerne..
git tree: upstream
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=116cce46e00000
If the result looks correct, please mark the bug fixed by replying with:
#syz fix: vt: selection, push sel_lock up
For information about bisection process see: https://goo.gl/tpsmEJ#bisection
commit e8c75a30a23c6ba63f4ef6895cbf41fd42f21aa2
Author: Jiri Slaby <jsl...@suse.cz>
Date: Fri Feb 28 11:54:06 2020 +0000
vt: selection, push sel_lock up
bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=14aada1de00000
start commit: ae4b064e Merge tag 'afs-fixes-20191211' of git://git.kerne..
git tree: upstream
kernel config: https://syzkaller.appspot.com/x/.config?x=79f79de2a27d3e3d
dashboard link: https://syzkaller.appspot.com/bug?extid=a172213a651850d94cf2
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=13bf312ee00000
dashboard link: https://syzkaller.appspot.com/bug?extid=a172213a651850d94cf2
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=116cce46e00000
If the result looks correct, please mark the bug fixed by replying with:
#syz fix: vt: selection, push sel_lock up
For information about bisection process see: https://goo.gl/tpsmEJ#bisection
Jiri Slaby
Mar 17, 2020, 1:59:35 AM3/17/20
to syzbot, gre...@linuxfoundation.org, jsl...@suse.cz, linux-...@vger.kernel.org, okash....@gmail.com, samuel....@ens-lyon.org, syzkall...@googlegroups.com
js
suse labs
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