binder: undelivered TRANSACTION_COMPLETE
binder: release 5357:5377 transaction 10 out, still active
binder: release 5284:5286 transaction 7 out, still active
binder: undelivered TRANSACTION_COMPLETE
binder: release 5284:5300 transaction 8 out, still active
INFO: task syz-executor4:11050 blocked for more than 140 seconds.
      Not tainted 4.9.128+ #93
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor4   D
28776 11050   2112 0x00000002
 0000000000000000 ffff8801d81ac200 ffff8801ac37af80 ffff8801db621018
 ffff8801a2ecf7a8 ffffffff8277ee02 0000000000000000 ffff8801cff0e7b0
 ffffed0039fe1cf5 00ff8801cff0df00 ffff8801db6218f0Call Trace:
 [<ffffffff8278032f>] schedule+0x7f/0x1b0 kernel/sched/core.c:3553
 [<ffffffff82780cb3>] schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3586
 [<ffffffff82782936>] __mutex_lock_common kernel/locking/mutex.c:582 [inline]
 [<ffffffff82782936>] mutex_lock_nested+0x326/0x870 kernel/locking/mutex.c:621
 [<ffffffff81ccf2a8>] tty_release+0xa88/0xd00 drivers/tty/tty_io.c:1933
 [<ffffffff814f0ca3>] __fput+0x263/0x700 fs/file_table.c:208
 [<ffffffff814f11c5>] ____fput+0x15/0x20 fs/file_table.c:244
 [<ffffffff811392ac>] task_work_run+0x10c/0x180 kernel/task_work.c:116
 [<ffffffff810e4027>] exit_task_work include/linux/task_work.h:21 [inline]
 [<ffffffff810e4027>] do_exit+0x787/0x2750 kernel/exit.c:833
 [<ffffffff810ea481>] do_group_exit+0x111/0x300 kernel/exit.c:937
 [<ffffffff8110b411>] get_signal+0x4e1/0x1460 kernel/signal.c:2321
 [<ffffffff81051225>] do_signal+0x95/0x1b00 arch/x86/kernel/signal.c:807
 [<ffffffff81003e2e>] exit_to_usermode_loop+0x10e/0x150 arch/x86/entry/common.c:157
 [<ffffffff8100570d>] prepare_exit_to_usermode arch/x86/entry/common.c:191 [inline]
 [<ffffffff8100570d>] syscall_return_slowpath arch/x86/entry/common.c:260 [inline]
 [<ffffffff8100570d>] do_syscall_64+0x35d/0x480 arch/x86/entry/common.c:287
 [<ffffffff8278df13>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb

Showing all locks held in the system:
2 locks held by khungtaskd/24:
 #0: 
 (rcu_read_lock){......}, at: [<ffffffff8130a0ac>] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline]
 (rcu_read_lock){......}, at: [<ffffffff8130a0ac>] watchdog+0x11c/0xa20 kernel/hung_task.c:239
 (tasklist_lock){.+.+..}, at: [<ffffffff813e71ec>] debug_show_all_locks+0x79/0x218 kernel/locking/lockdep.c:4336
 #0: 
 (&f->f_pos_lock){+.+.+.}, at: [<ffffffff8154c6fc>] __fdget_pos+0xac/0xd0 fs/file.c:781
 #0: 
 (&tty->ldisc_sem){++++++}, at: [<ffffffff8278bfd2>] ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367
 (&ldata->atomic_read_lock){+.+.+.}, at: [<ffffffff81cdee72>] n_tty_read+0x202/0x16e0 drivers/tty/n_tty.c:2142
 #0: 
 (&sig->cred_guard_mutex){+.+.+.}, at: [<ffffffff81501563>] prepare_bprm_creds+0x53/0x110 fs/exec.c:1369
 #0: 
 (tty_mutex){+.+.+.}, at: [<ffffffff81ccf2a8>] tty_release+0xa88/0xd00 drivers/tty/tty_io.c:1933
 #0: 
 (&tty->ldisc_sem){++++++}, at: [<ffffffff8278bfd2>] ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367
 (&tty->atomic_write_lock){+.+.+.}, at: [<ffffffff81cc7a51>] tty_write_lock+0x21/0x60 drivers/tty/tty_io.c:1107
 #0: 
 (tty_mutex){+.+.+.}, at: [<ffffffff81ccf2a8>] tty_release+0xa88/0xd00 drivers/tty/tty_io.c:1933
 #0: 
 (tty_mutex){+.+.+.}, at: [<ffffffff81cd36a6>] tty_open_by_driver drivers/tty/tty_io.c:2047 [inline]
 (tty_mutex){+.+.+.}, at: [<ffffffff81cd36a6>] tty_open+0x476/0xdf0 drivers/tty/tty_io.c:2125
 #0: 
 (tty_mutex){+.+.+.}, at: [<ffffffff81cd36a6>] tty_open_by_driver drivers/tty/tty_io.c:2047 [inline]
 (tty_mutex){+.+.+.}, at: [<ffffffff81cd36a6>] tty_open+0x476/0xdf0 drivers/tty/tty_io.c:2125
 #0: 
 (tty_mutex){+.+.+.}, at: [<ffffffff81cd36a6>] tty_open_by_driver drivers/tty/tty_io.c:2047 [inline]
 (tty_mutex){+.+.+.}, at: [<ffffffff81cd36a6>] tty_open+0x476/0xdf0 drivers/tty/tty_io.c:2125
 #0: 
 (tty_mutex){+.+.+.}, at: [<ffffffff81cd36a6>] tty_open_by_driver drivers/tty/tty_io.c:2047 [inline]
 (tty_mutex){+.+.+.}, at: [<ffffffff81cd36a6>] tty_open+0x476/0xdf0 drivers/tty/tty_io.c:2125
 #0: 
 (tty_mutex){+.+.+.}, at: [<ffffffff81cd36a6>] tty_open_by_driver drivers/tty/tty_io.c:2047 [inline]
 (tty_mutex){+.+.+.}, at: [<ffffffff81cd36a6>] tty_open+0x476/0xdf0 drivers/tty/tty_io.c:2125
 #0: 
 (tty_mutex){+.+.+.}, at: [<ffffffff81cd36a6>] tty_open_by_driver drivers/tty/tty_io.c:2047 [inline]
 (tty_mutex){+.+.+.}, at: [<ffffffff81cd36a6>] tty_open+0x476/0xdf0 drivers/tty/tty_io.c:2125
=============================================

NMI backtrace for cpu 0
CPU: 0 PID: 24 Comm: khungtaskd Not tainted 4.9.128+ #93
 ffff8801d9907d08
 ffffffff81af2469 0000000000000000 0000000000000000 0000000000000000
 0000000000000001 ffffffff810967d0 ffff8801d9907d40 ffffffff81afd1c9
 0000000000000000 0000000000000000 0000000000000003Call Trace:
 [<ffffffff81af2469>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81af2469>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81afd1c9>] nmi_cpu_backtrace.cold.0+0x48/0x87 lib/nmi_backtrace.c:99
 [<ffffffff81afd15c>] nmi_trigger_cpumask_backtrace+0x12c/0x151 lib/nmi_backtrace.c:60
 [<ffffffff810968d4>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37
 [<ffffffff8130a63d>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline]
 [<ffffffff8130a63d>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff8130a63d>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff8130a63d>] watchdog+0x6ad/0xa20 kernel/hung_task.c:239
 [<ffffffff8113e00d>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff8278e0dc>] 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: 24266 Comm: syz-executor1 Not tainted 4.9.128+ #93
task: ffff8801a7d82f80 task.stack: ffff8801d9e10000
RIP: 0033:[<000000000040157b>] 
c [<000000000040157b>] 0x40157b
RSP: 002b:00007f93781e8690  EFLAGS: 00000286
RAX: 00000000c1ed057e RBX: 000000000000000b RCX: 0000000000457679
RDX: 0000000000000000 RSI: 00007f93781e86c0 RDI: 000000000000000b
RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000004d7cf0 R14: 00000000004c49b7 R15: 0000000000000000
FS:  00007f93781e9700(0000) GS:ffff8801db700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c42833d7f0 CR3: 00000001c3920000 CR4: 00000000001606b0