binder: undelivered TRANSACTION_ERROR: 29201
INFO: task syz-executor0:13558 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-executor0   D30312 13558   2094 0x00000004
 ffff880167db8000 ffff8801cf3c3180 ffff88014c4f2100 ffff8801a7810000
 ffff8801db621018 ffff880140a77b10 ffffffff8277ee02 ffffffff82ecc360
 ffff880167db8000 ffffffff810ecbba 00fffc0000000000 ffff8801db6218f0
Call Trace:
 [<ffffffff8278032f>] schedule+0x7f/0x1b0 kernel/sched/core.c:3553
 [<ffffffff82231cac>] __lock_sock+0x13c/0x250 net/core/sock.c:2035
 [<ffffffff82231eb6>] lock_sock_nested+0xf6/0x120 net/core/sock.c:2505
 [<ffffffff8245ac24>] lock_sock include/net/sock.h:1404 [inline]
 [<ffffffff8245ac24>] do_tcp_setsockopt.isra.5+0x124/0x1ca0 net/ipv4/tcp.c:2486
 [<ffffffff8245c8c6>] tcp_setsockopt+0xb6/0xe0 net/ipv4/tcp.c:2760
 [<ffffffff8222c12a>] sock_common_setsockopt+0x9a/0xe0 net/core/sock.c:2706
 [<ffffffff82229a26>] SYSC_setsockopt net/socket.c:1785 [inline]
 [<ffffffff82229a26>] SyS_setsockopt+0x166/0x260 net/socket.c:1764
 [<ffffffff8100554f>] do_syscall_64+0x19f/0x480 arch/x86/entry/common.c:282
 [<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: [<ffffffff8130a2a0>] rcu_read_unlock include/linux/rcupdate.h:927 [inline]
 #0:  (rcu_read_lock){......}, at: [<ffffffff8130a2a0>] rcu_lock_break kernel/hung_task.c:143 [inline]
 #0:  (rcu_read_lock){......}, at: [<ffffffff8130a2a0>] check_hung_uninterruptible_tasks kernel/hung_task.c:177 [inline]
 #0:  (rcu_read_lock){......}, at: [<ffffffff8130a2a0>] watchdog+0x310/0xa20 kernel/hung_task.c:239
 #1:  (tasklist_lock){.+.+..}, at: [<ffffffff813e71ec>] debug_show_all_locks+0x79/0x218 kernel/locking/lockdep.c:4336
2 locks held by getty/2030:
 #0:  (&tty->ldisc_sem){++++++}, at: [<ffffffff8278bfd2>] ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367
 #1:  (&ldata->atomic_read_lock){+.+...}, at: [<ffffffff81cdee72>] n_tty_read+0x202/0x16e0 drivers/tty/n_tty.c:2142
1 lock held by syz-executor2/4881:
 #0:  (&sig->cred_guard_mutex){+.+.+.}, at: [<ffffffff81501563>] prepare_bprm_creds+0x53/0x110 fs/exec.c:1369
2 locks held by syz-executor4/11159:
 #0:  (&tty->ldisc_sem){++++++}, at: [<ffffffff8278bfd2>] ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367
 #1:  (&ldata->atomic_read_lock){+.+...}, at: [<ffffffff81cdee72>] n_tty_read+0x202/0x16e0 drivers/tty/n_tty.c:2142

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

NMI backtrace for cpu 1
CPU: 1 PID: 24 Comm: khungtaskd Not tainted 4.9.128+ #93
 ffff8801d9907d08 ffffffff81af2469 0000000000000000 0000000000000001
 0000000000000001 0000000000000001 ffffffff810967d0 ffff8801d9907d40
 ffffffff81afd1c9 0000000000000001 0000000000000000 0000000000000003
Call 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 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 25899 Comm: syz-executor4 Not tainted 4.9.128+ #93
task: ffff88017a958000 task.stack: ffff880186f80000
RIP: 0010:[<ffffffff810043f1>] 
c [<ffffffff810043f1>] syscall_trace_enter+0x1/0xd20 arch/x86/entry/common.c:65
RSP: 0018:ffff880186f87ef0  EFLAGS: 00000293
RAX: ffff88017a958000 RBX: ffff880186f87f58 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff81005664 RDI: ffff880186f87f58
RBP: ffff880186f87f48 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 00000000000000ca
R13: ffff880186f87fd0 R14: ffff88017a958000 R15: 0000000000000000
FS:  00007fd5bb219700(0000) GS:ffff8801db600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020478000 CR3: 0000000168212000 CR4: 00000000001606b0
Stack:
 ffff880186f87f48
c ffffffff8100566c
c 0000000000000000
c 0000000000000000
c
 0000000000000000
c 0000000000000000
c 0000000000000000
c 0000000000000000
c
 0000000000000000
c 0000000000000000
c 0000000000000000
c 0000000000000000
c
Call Trace:
 [<ffffffff8278df13>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
Code: 
cff 
cff 
ce8 
c33 
cf8 
c4c 
c00 
ce9 
c66 
cfe 
cff 
cff 
ce8 
c29 
cf8 
c4c 
c00 
ce9 
cd0 
cfd 
cff 
cff 
c4c 
c89 
cf7 
ce8 
c1c 
cf8 
c4c 
c00 
ce9 
c28 
cfe 
cff 
cff 
c0f 
c1f 
c80 
c00 
c00 
c00 
c00 
c55 
c<48> 
c89 
ce5 
c41 
c57 
c49 
cbf 
c00 
c00 
c00 
c00 
c00 
cfc 
cff 
cdf 
c41 
c56 
c4c 
c8d 
c75 
cd8 
c