binder: 9871:9898 ioctl 40046207 0 returned -16
binder: undelivered transaction 38, process died.
INFO: task syz-executor4:9896 blocked for more than 120 seconds.
      Not tainted 4.9.88-g71df7bb #60
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor4   D29072  9896   3834 0x00000004
 ffff8801d71cc800 0000000000000000 ffff8801c99764c0 ffffffff84429880
 ffff8801db221b98 ffff8801b20e7aa0 ffffffff838a69cb 0000000041b58ab3
 ffffffff84194260 00ffffff8123c410 ffff8801db222468 ffff8801db222490
Call Trace:
 [<ffffffff838a7f6f>] schedule+0x7f/0x1b0 kernel/sched/core.c:3550
 [<ffffffff838b40cc>] schedule_timeout+0x56c/0x10b0 kernel/time/timer.c:1768
 [<ffffffff838a617e>] io_schedule_timeout+0x1be/0x390 kernel/sched/core.c:5172
 [<ffffffff838a98de>] do_wait_for_common kernel/sched/completion.c:75 [inline]
 [<ffffffff838a98de>] __wait_for_common kernel/sched/completion.c:93 [inline]
 [<ffffffff838a98de>] wait_for_common_io kernel/sched/completion.c:107 [inline]
 [<ffffffff838a98de>] wait_for_completion_io+0x20e/0x2e0 kernel/sched/completion.c:155
 [<ffffffff81cdc7db>] submit_bio_wait+0x11b/0x180 block/bio.c:885
 [<ffffffff81d0f987>] blkdev_issue_flush+0x157/0x220 block/blk-flush.c:518
 [<ffffffff8162b115>] blkdev_fsync+0x85/0xb0 fs/block_dev.c:378
 [<ffffffff81616a4a>] vfs_fsync_range+0x10a/0x250 fs/sync.c:195
 [<ffffffff81616c02>] vfs_fsync fs/sync.c:209 [inline]
 [<ffffffff81616c02>] do_fsync+0x42/0xb0 fs/sync.c:219
 [<ffffffff816173a9>] SYSC_fdatasync fs/sync.c:233 [inline]
 [<ffffffff816173a9>] SyS_fdatasync+0x19/0x20 fs/sync.c:231
 [<ffffffff81006504>] do_syscall_64+0x1a4/0x490 arch/x86/entry/common.c:282
 [<ffffffff838b7a53>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb

Showing all locks held in the system:
2 locks held by khungtaskd/514:
 #0:  (rcu_read_lock){......}, at: [<ffffffff813735a5>] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline]
 #0:  (rcu_read_lock){......}, at: [<ffffffff813735a5>] watchdog+0x125/0xa70 kernel/hung_task.c:239
 #1:  (tasklist_lock){.+.+..}, at: [<ffffffff81238570>] debug_show_all_locks+0x70/0x280 kernel/locking/lockdep.c:4336
1 lock held by rsyslogd/3612:
 #0:  (&f->f_pos_lock){+.+.+.}, at: [<ffffffff815d43cf>] __fdget_pos+0x9f/0xc0 fs/file.c:781
2 locks held by getty/3740:
 #0:  (&tty->ldisc_sem){++++++}, at: [<ffffffff838b5c42>] ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367
 #1:  (&ldata->atomic_read_lock){+.+...}, at: [<ffffffff8200b3a4>] n_tty_read+0x1f4/0x16c0 drivers/tty/n_tty.c:2133

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

NMI backtrace for cpu 0
CPU: 0 PID: 514 Comm: khungtaskd Not tainted 4.9.88-g71df7bb #60
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801d853fd00 ffffffff81d95f19 0000000000000000 0000000000000000
 0000000000000000 0000000000000001 ffffffff810bb450 ffff8801d853fd38
 ffffffff81da103d 0000000000000000 0000000000000000 ffff8801b2099c18
Call Trace:
 [<ffffffff81d95f19>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81d95f19>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81da103d>] nmi_cpu_backtrace+0xfd/0x120 lib/nmi_backtrace.c:99
 [<ffffffff81da1177>] nmi_trigger_cpumask_backtrace+0x117/0x190 lib/nmi_backtrace.c:60
 [<ffffffff810bb544>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37
 [<ffffffff81373b70>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline]
 [<ffffffff81373b70>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff81373b70>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff81373b70>] watchdog+0x6f0/0xa70 kernel/hung_task.c:239
 [<ffffffff8119ae6d>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff838b7c1c>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:373
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.9.88-g71df7bb #60
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801d9b73000 task.stack: ffff8801d9b88000
RIP: 0010:[<ffffffff8136b920>] 
c [<ffffffff8136b920>] __sanitizer_cov_trace_pc+0x0/0x50
RSP: 0018:ffff8801db307f88  EFLAGS: 00000002
RAX: 0000000000000000 RBX: ffff8801db31ce80 RCX: 1ffffffff084007d
RDX: 1ffff1003b6639e2 RSI: 0000000000000001 RDI: ffffffff842003e8
RBP: ffff8801db307fb8 R08: 0000000000000000 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801db31cef4
R13: ffff8801db31cf10 R14: 0000000000000000 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe97e05e9b8 CR3: 00000001ce29c000 CR4: 0000000000160670
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffffffff812db08e
c ffff8801db307fb8
c ffff8801d9b73000
c 0000000000000001
c
 ffffffff84a37238
c 0000000000000000
c ffff8801db307fd0
c ffffffff811470b3
c
 ffffffff84a28128
c ffff8801db307fe8
c ffffffff838bc11a
c ffffffff84a28128
c
Call Trace:
 [<ffffffff811470b3>] irq_enter+0xb3/0xd0 kernel/softirq.c:345
 [<ffffffff838bc11a>] smp_reschedule_interrupt+0xa/0x80 arch/x86/kernel/smp.c:264
 [<ffffffff838b9d90>] reschedule_interrupt+0xa0/0xb0 arch/x86/entry/entry_64.S:671
 <EOI> 
d [<ffffffff838b66b6>] ? native_safe_halt+0x6/0x10 arch/x86/include/asm/irqflags.h:53
 [<ffffffff838b5ce5>] arch_safe_halt arch/x86/include/asm/paravirt.h:104 [inline]
 [<ffffffff838b5ce5>] default_idle+0x55/0x360 arch/x86/kernel/process.c:295
 [<ffffffff8106bc3a>] arch_cpu_idle+0xa/0x10 arch/x86/kernel/process.c:286
 [<ffffffff838b6af6>] default_idle_call+0x36/0x60 kernel/sched/idle.c:97
 [<ffffffff81226b70>] cpuidle_idle_call kernel/sched/idle.c:155 [inline]
 [<ffffffff81226b70>] cpu_idle_loop kernel/sched/idle.c:248 [inline]
 [<ffffffff81226b70>] cpu_startup_entry+0x2b0/0x380 kernel/sched/idle.c:303
 [<ffffffff810b0453>] start_secondary+0x303/0x3e0 arch/x86/kernel/smpboot.c:254
Code: 
c1d 
c00 
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c35 
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c00 
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cff 
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c84 
c00 
c00 
c00 
c00 
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c00 
c<55> 
c48 
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c04 
c25 
c40 
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c01 
c00 
c65 
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c15 
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cc3 
cca 
c7e 
c81 
c