binder: undelivered TRANSACTION_ERROR: 29189
binder: undelivered TRANSACTION_ERROR: 29189
IPVS: Creating netns size=2536 id=41
IPVS: Creating netns size=2536 id=42
INFO: task kworker/u4:0:6 blocked for more than 120 seconds.
      Not tainted 4.9.96-g71fce1e #10
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
kworker/u4:0    D25528     6      2 0x00000000
Workqueue: events_unbound flush_to_ldisc
 ffff8801d9a38000 ffff8801955bca80 ffff880195f3df80 ffff8801b5428000
 ffff8801db221b98 ffff8801d9a476c8 ffffffff839e240d ffffffff81233817
 0000000000000000 ffff8801d9a388c0 0000000600000007 ffff8801db222468
Call Trace:
 [<ffffffff839e3a0f>] schedule+0x7f/0x1b0 kernel/sched/core.c:3557
 [<ffffffff839ef048>] __rwsem_down_write_failed_common kernel/locking/rwsem-xadd.c:526 [inline]
 [<ffffffff839ef048>] rwsem_down_write_failed+0x598/0x990 kernel/locking/rwsem-xadd.c:555
 [<ffffffff81ee4e77>] call_rwsem_down_write_failed+0x17/0x30 arch/x86/lib/rwsem.S:105
 [<ffffffff839ece1c>] __down_write arch/x86/include/asm/rwsem.h:125 [inline]
 [<ffffffff839ece1c>] down_write+0x5c/0xa0 kernel/locking/rwsem.c:54
 [<ffffffff8211a88d>] isig+0xbd/0x4c0 drivers/tty/n_tty.c:1100
 [<ffffffff8211b332>] n_tty_receive_signal_char+0x22/0xf0 drivers/tty/n_tty.c:1212
 [<ffffffff8211f561>] n_tty_receive_char_special+0x10e1/0x2860 drivers/tty/n_tty.c:1258
 [<ffffffff82122c2a>] n_tty_receive_buf_fast drivers/tty/n_tty.c:1579 [inline]
 [<ffffffff82122c2a>] __receive_buf drivers/tty/n_tty.c:1613 [inline]
 [<ffffffff82122c2a>] n_tty_receive_buf_common+0x18ea/0x2300 drivers/tty/n_tty.c:1711
 [<ffffffff82123673>] n_tty_receive_buf2+0x33/0x40 drivers/tty/n_tty.c:1746
 [<ffffffff8212917f>] tty_ldisc_receive_buf+0xaf/0x190 drivers/tty/tty_buffer.c:455
 [<ffffffff8212a183>] receive_buf drivers/tty/tty_buffer.c:474 [inline]
 [<ffffffff8212a183>] flush_to_ldisc+0x253/0x370 drivers/tty/tty_buffer.c:533
 [<ffffffff8118ae31>] process_one_work+0x7e1/0x1500 kernel/workqueue.c:2092
 [<ffffffff8118bc26>] worker_thread+0xd6/0x10a0 kernel/workqueue.c:2226
 [<ffffffff8119ad5d>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff839f34dc>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:373

Showing all locks held in the system:
5 locks held by kworker/u4:0/6:
 #0:  ("events_unbound"){.+.+.+}, at: [<ffffffff8118ad3e>] work_static include/linux/workqueue.h:186 [inline]
 #0:  ("events_unbound"){.+.+.+}, at: [<ffffffff8118ad3e>] set_work_data kernel/workqueue.c:617 [inline]
 #0:  ("events_unbound"){.+.+.+}, at: [<ffffffff8118ad3e>] set_work_pool_and_clear_pending kernel/workqueue.c:644 [inline]
 #0:  ("events_unbound"){.+.+.+}, at: [<ffffffff8118ad3e>] process_one_work+0x6ee/0x1500 kernel/workqueue.c:2085
 #1:  ((&buf->work)){+.+...}, at: [<ffffffff8118ad78>] process_one_work+0x728/0x1500 kernel/workqueue.c:2089
 #2:  (&tty->ldisc_sem){++++++}, at: [<ffffffff82127940>] tty_ldisc_ref+0x20/0x80 drivers/tty/tty_ldisc.c:297
 #3:  (&port->buf.lock/1){+.+...}, at: [<ffffffff82129fb6>] flush_to_ldisc+0x86/0x370 drivers/tty/tty_buffer.c:505
 #4:  (&o_tty->termios_rwsem/1){++++..}, at: [<ffffffff8211a88d>] isig+0xbd/0x4c0 drivers/tty/n_tty.c:1100
2 locks held by khungtaskd/518:
 #0:  (rcu_read_lock){......}, at: [<ffffffff813646ec>] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline]
 #0:  (rcu_read_lock){......}, at: [<ffffffff813646ec>] watchdog+0x11c/0xa20 kernel/hung_task.c:239
 #1:  (tasklist_lock){.+.+..}, at: [<ffffffff81423ce0>] debug_show_all_locks+0x79/0x218 kernel/locking/lockdep.c:4336
2 locks held by getty/3766:
 #0:  (&tty->ldisc_sem){++++++}, at: [<ffffffff839f14b2>] ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367
 #1:  (&ldata->atomic_read_lock){+.+.+.}, at: [<ffffffff8211c792>] n_tty_read+0x202/0x16e0 drivers/tty/n_tty.c:2133
4 locks held by syz-executor6/18427:
 #0:  (&tty->legacy_mutex){+.+.+.}, at: [<ffffffff8212d0fa>] tty_lock+0x6a/0xd0 drivers/tty/tty_mutex.c:18
 #1:  (&tty->legacy_mutex/1){+.+.+.}, at: [<ffffffff8212d0fa>] tty_lock+0x6a/0xd0 drivers/tty/tty_mutex.c:18
 #2:  (&tty->ldisc_sem){++++++}, at: [<ffffffff82127940>] tty_ldisc_ref+0x20/0x80 drivers/tty/tty_ldisc.c:297
 #3:  (&o_tty->termios_rwsem/1){++++..}, at: [<ffffffff8211a4e1>] n_tty_flush_buffer+0x21/0x310 drivers/tty/n_tty.c:359

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

NMI backtrace for cpu 0
CPU: 0 PID: 518 Comm: khungtaskd Not tainted 4.9.96-g71fce1e #10
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801d855fd08 ffffffff81eb0b69 0000000000000000 0000000000000000
 0000000000000000 0000000000000001 ffffffff810b7d60 ffff8801d855fd40
 ffffffff81ebbe97 0000000000000000 0000000000000000 0000000000000003
Call Trace:
 [<ffffffff81eb0b69>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81eb0b69>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81ebbe97>] nmi_cpu_backtrace.cold.2+0x48/0x87 lib/nmi_backtrace.c:99
 [<ffffffff81ebbe2a>] nmi_trigger_cpumask_backtrace+0x12a/0x14f lib/nmi_backtrace.c:60
 [<ffffffff810b7e64>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37
 [<ffffffff81364c84>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline]
 [<ffffffff81364c84>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff81364c84>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff81364c84>] watchdog+0x6b4/0xa20 kernel/hung_task.c:239
 [<ffffffff8119ad5d>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff839f34dc>] 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: 4850 Comm: kworker/u4:6 Not tainted 4.9.96-g71fce1e #10
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events_unbound flush_to_ldisc
c
task: ffff8801ca368000 task.stack: ffff8801c7e58000
RIP: 0010:[<ffffffff8211f3d5>] 
c [<ffffffff8211f3d5>] read_buf drivers/tty/n_tty.c:136 [inline]
RIP: 0010:[<ffffffff8211f3d5>] 
c [<ffffffff8211f3d5>] n_tty_receive_char_special+0xf55/0x2860 drivers/tty/n_tty.c:1308
RSP: 0018:ffff8801c7e5f9b8  EFLAGS: 00000a06
RAX: 1ffff920011e4450 RBX: ffffc90008f22000 RCX: 0000000000000000
RDX: ffffc90008f22282 RSI: ffffffff8211f3bc RDI: ffffc90008f22282
RBP: ffff8801c7e5fa40 R08: ffff8801ca368988 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: dffffc0000000000
R13: 00000001725ee224 R14: 0000000000000224 R15: ffff880195b6a200
FS:  0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c43c327010 CR3: 0000000194bb4000 CR4: 00000000001606f0
DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Stack:
 ffffffff821213cb
c ffffc90008f22018
c fffff520011e4403
c ffffc90008f22010
c
 000000000000006e
c 0000000000000000
c 0000000000000000
c ffff880195b6a200
c
 ffff8801c7e5fa40
c ffff880195b6a5a8
c ffffc90008f22018
c 0000000000000027
c
Call Trace:
 [<ffffffff82122c2a>] n_tty_receive_buf_fast drivers/tty/n_tty.c:1579 [inline]
 [<ffffffff82122c2a>] __receive_buf drivers/tty/n_tty.c:1613 [inline]
 [<ffffffff82122c2a>] n_tty_receive_buf_common+0x18ea/0x2300 drivers/tty/n_tty.c:1711
 [<ffffffff82123673>] n_tty_receive_buf2+0x33/0x40 drivers/tty/n_tty.c:1746
 [<ffffffff8212917f>] tty_ldisc_receive_buf+0xaf/0x190 drivers/tty/tty_buffer.c:455
 [<ffffffff8212a183>] receive_buf drivers/tty/tty_buffer.c:474 [inline]
 [<ffffffff8212a183>] flush_to_ldisc+0x253/0x370 drivers/tty/tty_buffer.c:533
 [<ffffffff8118ae31>] process_one_work+0x7e1/0x1500 kernel/workqueue.c:2092
 [<ffffffff8118bc26>] worker_thread+0xd6/0x10a0 kernel/workqueue.c:2226
 [<ffffffff8119ad5d>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff839f34dc>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:373
Code: 
cfe 
cff 
cff 
c49 
cbc 
c00 
c00 
c00 
c00 
c00 
cfc 
cff 
cdf 
ce8 
c44 
cd6 
c23 
cff 
c4d 
c89 
cee 
c41 
c81 
ce6 
cff 
c0f 
c00 
c00 
c4a 
c8d 
c7c 
c33 
c5e 
c48 
c89 
cf8 
c48 
c89 
cfa 
c48 
cc1 
ce8 
c03 
c<83> 
ce2 
c07 
c42 
c0f 
cb6 
c04 
c20 
c38 
cd0 
c7f 
c08 
c84 
cc0 
c0f 
c85 
c3e 
c14 
c00 
c00 
c42 
c