INFO: task hung in tty_release_struct

[syzbot]

Hello,

syzbot found the following crash on:

HEAD commit: 666c420f FROMLIST: ANDROID: binder: Add BINDER_GET_NODE_IN..
git tree: android-4.14
console output: https://syzkaller.appspot.com/x/log.txt?x=123dbefa400000
kernel config: https://syzkaller.appspot.com/x/.config?x=89d929f317ea847c
dashboard link: https://syzkaller.appspot.com/bug?extid=a056cc7d4d1a68544ac1
compiler: gcc (GCC) 8.0.1 20180413 (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+a056cc...@syzkaller.appspotmail.com

b_state=0x00000029, b_size=4096
device loop0 blocksize: 2048
__find_get_block_slow() failed. block=1, b_blocknr=0
b_state=0x00000029, b_size=4096
device loop0 blocksize: 2048
INFO: task syz-executor0:4596 blocked for more than 140 seconds.
Not tainted 4.14.71+ #8
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor0 D27624 4596 4593 0x80000002
Call Trace:
schedule+0x7f/0x1b0 kernel/sched/core.c:3490
schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3548
__mutex_lock_common kernel/locking/mutex.c:833 [inline]
__mutex_lock+0x521/0x1480 kernel/locking/mutex.c:893
tty_release_struct+0x2a/0x50 drivers/tty/tty_io.c:1600
tty_release+0xaf1/0xdc0 drivers/tty/tty_io.c:1761
__fput+0x25e/0x6f0 fs/file_table.c:210
task_work_run+0x116/0x190 kernel/task_work.c:113
exit_task_work include/linux/task_work.h:22 [inline]
do_exit+0x8f8/0x2800 kernel/exit.c:865
do_group_exit+0x100/0x2e0 kernel/exit.c:968
get_signal+0x4e5/0x1470 kernel/signal.c:2348
do_signal+0x8f/0x1660 arch/x86/kernel/signal.c:809
exit_to_usermode_loop+0x116/0x150 arch/x86/entry/common.c:159
prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline]
syscall_return_slowpath arch/x86/entry/common.c:267 [inline]
do_syscall_64+0x35d/0x4b0 arch/x86/entry/common.c:294
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x457679
RSP: 002b:00007fa412304cf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 000000000072bf08 RCX: 0000000000457679
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000072bf08
RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000072bf0c
R13: 00007ffc7521490f R14: 00007fa4123059c0 R15: 0000000000000000
INFO: task syz-executor0:6165 blocked for more than 140 seconds.
Not tainted 4.14.71+ #8
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor0 D27624 6165 1849 0x80000002
Call Trace:
schedule+0x7f/0x1b0 kernel/sched/core.c:3490
schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3548
__mutex_lock_common kernel/locking/mutex.c:833 [inline]
__mutex_lock+0x521/0x1480 kernel/locking/mutex.c:893
tty_release_struct+0x2a/0x50 drivers/tty/tty_io.c:1600
tty_release+0xaf1/0xdc0 drivers/tty/tty_io.c:1761
__fput+0x25e/0x6f0 fs/file_table.c:210
task_work_run+0x116/0x190 kernel/task_work.c:113
exit_task_work include/linux/task_work.h:22 [inline]
do_exit+0x8f8/0x2800 kernel/exit.c:865
do_group_exit+0x100/0x2e0 kernel/exit.c:968
get_signal+0x4e5/0x1470 kernel/signal.c:2348
do_signal+0x8f/0x1660 arch/x86/kernel/signal.c:809
exit_to_usermode_loop+0x116/0x150 arch/x86/entry/common.c:159
prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline]
syscall_return_slowpath arch/x86/entry/common.c:267 [inline]
do_syscall_64+0x35d/0x4b0 arch/x86/entry/common.c:294
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x457679
RSP: 002b:00007fa4122e3cf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 000000000072bfa8 RCX: 0000000000457679
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000072bfa8
RBP: 000000000072bfa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000072bfac
R13: 00007ffc7521490f R14: 00007fa4122e49c0 R15: 0000000000000001
INFO: task init:7006 blocked for more than 140 seconds.
Not tainted 4.14.71+ #8
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
init D29352 7006 1 0x00000000
Call Trace:
schedule+0x7f/0x1b0 kernel/sched/core.c:3490
schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3548
__mutex_lock_common kernel/locking/mutex.c:833 [inline]
__mutex_lock+0x521/0x1480 kernel/locking/mutex.c:893
tty_open_by_driver drivers/tty/tty_io.c:1922 [inline]
tty_open+0x3a8/0x980 drivers/tty/tty_io.c:2006
chrdev_open+0x20d/0x570 fs/char_dev.c:417
do_dentry_open+0x426/0xda0 fs/open.c:764
vfs_open+0x11c/0x210 fs/open.c:878
do_last fs/namei.c:3408 [inline]
path_openat+0x4eb/0x23a0 fs/namei.c:3550
do_filp_open+0x197/0x270 fs/namei.c:3584
do_sys_open+0x2ef/0x580 fs/open.c:1071
do_syscall_64+0x19b/0x4b0 arch/x86/entry/common.c:289
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x7f6a051f9120
RSP: 002b:00007ffc18c5d388 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 000000000116c280 RCX: 00007f6a051f9120
RDX: 0000000000000010 RSI: 0000000000000902 RDI: 00000000004072c8
RBP: 0000000000000000 R08: 0000000000407370 R09: 0000000000000001
R10: 0000000000000008 R11: 0000000000000246 R12: 0000000000000902
R13: 0000000000000102 R14: 00007ffc18c5d500 R15: 000000000116c288
INFO: task init:7007 blocked for more than 140 seconds.
Not tainted 4.14.71+ #8
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
init D29112 7007 1 0x00000000
Call Trace:
schedule+0x7f/0x1b0 kernel/sched/core.c:3490
schedule_timeout+0x710/0xe60 kernel/time/timer.c:1721
__down_common kernel/locking/semaphore.c:221 [inline]
__down+0x180/0x2a0 kernel/locking/semaphore.c:238
down+0x58/0x70 kernel/locking/semaphore.c:62
console_lock+0x24/0x70 kernel/printk/printk.c:2056
console_device+0x17/0xb0 kernel/printk/printk.c:2343
tty_lookup_driver+0x17a/0x210 drivers/tty/tty_io.c:1828
tty_open_by_driver drivers/tty/tty_io.c:1923 [inline]
tty_open+0x3b9/0x980 drivers/tty/tty_io.c:2006
chrdev_open+0x20d/0x570 fs/char_dev.c:417
do_dentry_open+0x426/0xda0 fs/open.c:764
vfs_open+0x11c/0x210 fs/open.c:878
do_last fs/namei.c:3408 [inline]
path_openat+0x4eb/0x23a0 fs/namei.c:3550
do_filp_open+0x197/0x270 fs/namei.c:3584
do_sys_open+0x2ef/0x580 fs/open.c:1071
do_syscall_64+0x19b/0x4b0 arch/x86/entry/common.c:289
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x7f6a051f9120
RSP: 002b:00007ffc18c5d388 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 000000000116c0e0 RCX: 00007f6a051f9120
RDX: 0000000000000010 RSI: 0000000000000902 RDI: 00000000004072c8
RBP: 0000000000000000 R08: 0000000000407370 R09: 0000000000000001
R10: 0000000000000008 R11: 0000000000000246 R12: 0000000000000902
R13: 0000000000000102 R14: 00007ffc18c5d500 R15: 000000000116c0e8
INFO: task init:7008 blocked for more than 140 seconds.
Not tainted 4.14.71+ #8
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
init D29352 7008 1 0x00000000
Call Trace:
schedule+0x7f/0x1b0 kernel/sched/core.c:3490
schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3548
__mutex_lock_common kernel/locking/mutex.c:833 [inline]
__mutex_lock+0x521/0x1480 kernel/locking/mutex.c:893
tty_open_by_driver drivers/tty/tty_io.c:1922 [inline]
tty_open+0x3a8/0x980 drivers/tty/tty_io.c:2006
chrdev_open+0x20d/0x570 fs/char_dev.c:417
do_dentry_open+0x426/0xda0 fs/open.c:764
vfs_open+0x11c/0x210 fs/open.c:878
do_last fs/namei.c:3408 [inline]
path_openat+0x4eb/0x23a0 fs/namei.c:3550
do_filp_open+0x197/0x270 fs/namei.c:3584
do_sys_open+0x2ef/0x580 fs/open.c:1071
do_syscall_64+0x19b/0x4b0 arch/x86/entry/common.c:289
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x7f6a051f9120
RSP: 002b:00007ffc18c5d388 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 000000000116c010 RCX: 00007f6a051f9120
RDX: 0000000000000010 RSI: 0000000000000902 RDI: 00000000004072c8
RBP: 0000000000000000 R08: 0000000000407370 R09: 0000000000000001
R10: 0000000000000008 R11: 0000000000000246 R12: 0000000000000902
R13: 0000000000000102 R14: 00007ffc18c5d500 R15: 000000000116c018
INFO: task init:7009 blocked for more than 140 seconds.
Not tainted 4.14.71+ #8
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
init D29352 7009 1 0x00000000
Call Trace:
schedule+0x7f/0x1b0 kernel/sched/core.c:3490
schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3548
__mutex_lock_common kernel/locking/mutex.c:833 [inline]
__mutex_lock+0x521/0x1480 kernel/locking/mutex.c:893
tty_open_by_driver drivers/tty/tty_io.c:1922 [inline]
tty_open+0x3a8/0x980 drivers/tty/tty_io.c:2006
chrdev_open+0x20d/0x570 fs/char_dev.c:417
do_dentry_open+0x426/0xda0 fs/open.c:764
vfs_open+0x11c/0x210 fs/open.c:878
do_last fs/namei.c:3408 [inline]
path_openat+0x4eb/0x23a0 fs/namei.c:3550
do_filp_open+0x197/0x270 fs/namei.c:3584
do_sys_open+0x2ef/0x580 fs/open.c:1071
do_syscall_64+0x19b/0x4b0 arch/x86/entry/common.c:289
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x7f6a051f9120
RSP: 002b:00007ffc18c5d388 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 000000000116c350 RCX: 00007f6a051f9120
RDX: 0000000000000010 RSI: 0000000000000902 RDI: 00000000004072c8
RBP: 0000000000000000 R08: 0000000000407370 R09: 0000000000000001
R10: 0000000000000008 R11: 0000000000000246 R12: 0000000000000902
R13: 0000000000000102 R14: 00007ffc18c5d500 R15: 000000000116c358
INFO: task init:7010 blocked for more than 140 seconds.
Not tainted 4.14.71+ #8
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
init D29352 7010 1 0x00000000
Call Trace:
schedule+0x7f/0x1b0 kernel/sched/core.c:3490
schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3548
__mutex_lock_common kernel/locking/mutex.c:833 [inline]
__mutex_lock+0x521/0x1480 kernel/locking/mutex.c:893
tty_open_by_driver drivers/tty/tty_io.c:1922 [inline]
tty_open+0x3a8/0x980 drivers/tty/tty_io.c:2006
chrdev_open+0x20d/0x570 fs/char_dev.c:417
do_dentry_open+0x426/0xda0 fs/open.c:764
vfs_open+0x11c/0x210 fs/open.c:878
do_last fs/namei.c:3408 [inline]
path_openat+0x4eb/0x23a0 fs/namei.c:3550
do_filp_open+0x197/0x270 fs/namei.c:3584
do_sys_open+0x2ef/0x580 fs/open.c:1071
do_syscall_64+0x19b/0x4b0 arch/x86/entry/common.c:289
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x7f6a051f9120
RSP: 002b:00007ffc18c5d388 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 000000000116bf40 RCX: 00007f6a051f9120
RDX: 0000000000000010 RSI: 0000000000000902 RDI: 00000000004072c8
RBP: 0000000000000000 R08: 0000000000407370 R09: 0000000000000001
R10: 0000000000000008 R11: 0000000000000246 R12: 0000000000000902
R13: 0000000000000102 R14: 00007ffc18c5d500 R15: 000000000116bf48
INFO: task init:7011 blocked for more than 140 seconds.
Not tainted 4.14.71+ #8
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
init D29352 7011 1 0x00000000
Call Trace:
schedule+0x7f/0x1b0 kernel/sched/core.c:3490
schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3548
__mutex_lock_common kernel/locking/mutex.c:833 [inline]
__mutex_lock+0x521/0x1480 kernel/locking/mutex.c:893
tty_open_by_driver drivers/tty/tty_io.c:1922 [inline]
tty_open+0x3a8/0x980 drivers/tty/tty_io.c:2006
chrdev_open+0x20d/0x570 fs/char_dev.c:417
do_dentry_open+0x426/0xda0 fs/open.c:764
vfs_open+0x11c/0x210 fs/open.c:878
do_last fs/namei.c:3408 [inline]
path_openat+0x4eb/0x23a0 fs/namei.c:3550
do_filp_open+0x197/0x270 fs/namei.c:3584
do_sys_open+0x2ef/0x580 fs/open.c:1071
do_syscall_64+0x19b/0x4b0 arch/x86/entry/common.c:289
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x7f6a051f9120
RSP: 002b:00007ffc18c5d388 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 000000000116c1b0 RCX: 00007f6a051f9120
RDX: 0000000000000010 RSI: 0000000000000902 RDI: 00000000004072c8
RBP: 0000000000000000 R08: 0000000000407370 R09: 0000000000000001
R10: 0000000000000008 R11: 0000000000000246 R12: 0000000000000902
R13: 0000000000000102 R14: 00007ffc18c5d500 R15: 000000000116c1b8

Showing all locks held in the system:
1 lock held by khungtaskd/23:
#0: (tasklist_lock){.+.+}, at: [<ffffffff9c201e67>]
debug_show_all_locks+0x74/0x20f kernel/locking/lockdep.c:4541
1 lock held by rsyslogd/1633:
#0: (&f->f_pos_lock){+.+.}, at: [<ffffffff9c5bd162>]
__fdget_pos+0xa2/0xc0 fs/file.c:768
2 locks held by getty/1760:
#0: (&tty->ldisc_sem){++++}, at: [<ffffffff9cd245e0>]
tty_ldisc_ref_wait+0x20/0x80 drivers/tty/tty_ldisc.c:275
#1: (&ldata->atomic_read_lock){+.+.}, at: [<ffffffff9cd1fb5f>]
n_tty_read+0x1ff/0x15e0 drivers/tty/n_tty.c:2142
1 lock held by syz-executor0/4596:
#0: (tty_mutex){+.+.}, at: [<ffffffff9cd0bb8a>]
tty_release_struct+0x2a/0x50 drivers/tty/tty_io.c:1600
2 locks held by syz-executor5/4618:
#0: (&tty->ldisc_sem){++++}, at: [<ffffffff9cd245e0>]
tty_ldisc_ref_wait+0x20/0x80 drivers/tty/tty_ldisc.c:275
#1: (&ldata->atomic_read_lock){+.+.}, at: [<ffffffff9cd1fb5f>]
n_tty_read+0x1ff/0x15e0 drivers/tty/n_tty.c:2142
1 lock held by syz-executor0/6165:
#0: (tty_mutex){+.+.}, at: [<ffffffff9cd0bb8a>]
tty_release_struct+0x2a/0x50 drivers/tty/tty_io.c:1600
1 lock held by init/7006:
#0: (tty_mutex){+.+.}, at: [<ffffffff9cd13fd8>] tty_open_by_driver
drivers/tty/tty_io.c:1922 [inline]
#0: (tty_mutex){+.+.}, at: [<ffffffff9cd13fd8>] tty_open+0x3a8/0x980
drivers/tty/tty_io.c:2006
1 lock held by init/7007:
#0: (tty_mutex){+.+.}, at: [<ffffffff9cd13fd8>] tty_open_by_driver
drivers/tty/tty_io.c:1922 [inline]
#0: (tty_mutex){+.+.}, at: [<ffffffff9cd13fd8>] tty_open+0x3a8/0x980
drivers/tty/tty_io.c:2006
1 lock held by init/7008:
#0: (tty_mutex){+.+.}, at: [<ffffffff9cd13fd8>] tty_open_by_driver
drivers/tty/tty_io.c:1922 [inline]
#0: (tty_mutex){+.+.}, at: [<ffffffff9cd13fd8>] tty_open+0x3a8/0x980
drivers/tty/tty_io.c:2006
1 lock held by init/7009:
#0: (tty_mutex){+.+.}, at: [<ffffffff9cd13fd8>] tty_open_by_driver
drivers/tty/tty_io.c:1922 [inline]
#0: (tty_mutex){+.+.}, at: [<ffffffff9cd13fd8>] tty_open+0x3a8/0x980
drivers/tty/tty_io.c:2006
1 lock held by init/7010:
#0: (tty_mutex){+.+.}, at: [<ffffffff9cd13fd8>] tty_open_by_driver
drivers/tty/tty_io.c:1922 [inline]
#0: (tty_mutex){+.+.}, at: [<ffffffff9cd13fd8>] tty_open+0x3a8/0x980
drivers/tty/tty_io.c:2006
1 lock held by init/7011:
#0: (tty_mutex){+.+.}, at: [<ffffffff9cd13fd8>] tty_open_by_driver
drivers/tty/tty_io.c:1922 [inline]
#0: (tty_mutex){+.+.}, at: [<ffffffff9cd13fd8>] tty_open+0x3a8/0x980
drivers/tty/tty_io.c:2006

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

NMI backtrace for cpu 1
CPU: 1 PID: 23 Comm: khungtaskd Not tainted 4.14.71+ #8
Call Trace:
__dump_stack lib/dump_stack.c:17 [inline]
dump_stack+0xb9/0x11b lib/dump_stack.c:53
nmi_cpu_backtrace.cold.0+0x47/0x85 lib/nmi_backtrace.c:101
nmi_trigger_cpumask_backtrace+0x121/0x146 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:138 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:196 [inline]
watchdog+0x574/0xa70 kernel/hung_task.c:252
kthread+0x348/0x420 kernel/kthread.c:232
ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:402
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 6978 Comm: syz-executor3 Not tainted 4.14.71+ #8
task: ffff8801c9f61780 task.stack: ffff8801c8bb0000
RIP: 0010:__preempt_count_sub arch/x86/include/asm/preempt.h:81 [inline]
RIP: 0010:preempt_count_sub+0x66/0x120 kernel/sched/core.c:3196
RSP: 0018:ffff8801c8bb77c0 EFLAGS: 00000093
RAX: 0000000080000002 RBX: 00000000ffffffff RCX: 0000000000000000
RDX: 0000000000000002 RSI: ffffc90002589000 RDI: ffffffff9f9ce3a0
RBP: ffff8801c8bb77c8 R08: 0000000000007295 R09: ffffffff9f4fbb48
R10: ffff8801c9f62000 R11: 0000000000000001 R12: 00000000000008fd
R13: 0000000000000000 R14: fffffbfff4063b35 R15: ffffffffa031db92
FS: 00007fe477087700(0000) GS:ffff8801db800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f67dd584000 CR3: 00000001d3602003 CR4: 00000000001606b0
DR0: 0000000020000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
delay_tsc+0x66/0xb0 arch/x86/lib/delay.c:66
wait_for_xmitr+0x66/0x1e0 drivers/tty/serial/8250/8250_port.c:2040
serial8250_console_putchar+0x19/0x50
drivers/tty/serial/8250/8250_port.c:3184
uart_console_write+0x4b/0xd0 drivers/tty/serial/serial_core.c:1883
serial8250_console_write+0x51b/0x800
drivers/tty/serial/8250/8250_port.c:3250
call_console_drivers kernel/printk/printk.c:1574 [inline]
console_unlock+0x5b9/0xb50 kernel/printk/printk.c:2242
vprintk_emit+0x112/0x150 kernel/printk/printk.c:1766
vprintk_func+0x58/0x159 kernel/printk/printk_safe.c:401
printk+0xa7/0xcf kernel/printk/printk.c:1838
input_register_device.cold.14+0x23/0x202 drivers/input/input.c:2149
uinput_create_device drivers/input/misc/uinput.c:323 [inline]
uinput_ioctl_handler.isra.4+0x835/0x1850 drivers/input/misc/uinput.c:838
vfs_ioctl fs/ioctl.c:46 [inline]
file_ioctl fs/ioctl.c:500 [inline]
do_vfs_ioctl+0x1a0/0x1030 fs/ioctl.c:684
SYSC_ioctl fs/ioctl.c:701 [inline]
SyS_ioctl+0x7e/0xb0 fs/ioctl.c:692
do_syscall_64+0x19b/0x4b0 arch/x86/entry/common.c:289
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x457679
RSP: 002b:00007fe477086c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fe4770876d4 RCX: 0000000000457679
RDX: 0000000020000300 RSI: 0000000000005501 RDI: 0000000000000003
RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000004d1e18 R14: 00000000004c13df R15: 0000000000000000
Code: e5 86 03 85 c9 75 1b 65 8b 05 27 e0 eb 63 89 c2 81 e2 ff ff ff 7f 39
d3 7f 14 81 fb fe 00 00 00 76 51 f7 db 65 01 1d 0a e0 eb 63 <5b> 5d c3 e8
82 37 9e 00 85 c0 74 f4 48 c7 c7 60 62 a0 9f 48 b8


---
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https://goo.gl/tpsmEJ#status for how to communicate with syzbot.

[syzbot]

Auto-closing this bug as obsolete.
Crashes did not happen for a while, no reproducer and no activity.