binder: send failed reply for transaction 145 to 29407:29408
binder_alloc: binder_alloc_mmap_handler: 29407 20000000-20002000 already mapped failed -16
binder: 29407:29408 transaction failed 29189/-22, size 40-8 line 3010
binder: undelivered TRANSACTION_ERROR: 29189
INFO: task syz-executor6:29365 blocked for more than 120 seconds.
      Not tainted 4.9.87-g97d7f1c #2
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor6   D28944 29365  17193 0x20020004
 ffff8801d94e8000 ffff8801b85caf40 ffff8801b0e05500 ffff8801b8fa1800
 ffff8801db221b98 ffff8801d058f930 ffffffff838a5adb 0000000041b58ab3
 ffffffff84193c70 00ffffff8123c1a0 ffff8801db222468 ffff8801db222490
Call Trace:
 [<ffffffff838a707f>] schedule+0x7f/0x1b0 kernel/sched/core.c:3550
 [<ffffffff838b31dc>] schedule_timeout+0x56c/0x10b0 kernel/time/timer.c:1768
 [<ffffffff838a528e>] io_schedule_timeout+0x1be/0x390 kernel/sched/core.c:5172
 [<ffffffff838a84f9>] io_schedule include/linux/sched.h:460 [inline]
 [<ffffffff838a84f9>] bit_wait_io+0x19/0xa0 kernel/sched/wait.c:582
 [<ffffffff838a7bd7>] __wait_on_bit+0x57/0x120 kernel/sched/wait.c:383
 [<ffffffff81432874>] wait_on_page_bit+0xf4/0x140 mm/filemap.c:802
 [<ffffffff81432a81>] wait_on_page_writeback include/linux/pagemap.h:526 [inline]
 [<ffffffff81432a81>] __filemap_fdatawait_range+0x1c1/0x2b0 mm/filemap.c:453
 [<ffffffff8143c9e3>] filemap_fdatawait_keep_errors+0x63/0x80 mm/filemap.c:511
 [<ffffffff816162c0>] fdatawait_one_bdev+0x50/0x70 fs/sync.c:94
 [<ffffffff81631979>] iterate_bdevs+0x109/0x260 fs/block_dev.c:1978
 [<ffffffff81616b91>] sys_sync+0xe1/0x170 fs/sync.c:116
 [<ffffffff81006f95>] do_syscall_32_irqs_on arch/x86/entry/common.c:325 [inline]
 [<ffffffff81006f95>] do_fast_syscall_32+0x2f5/0x870 arch/x86/entry/common.c:387
 [<ffffffff838b8250>] entry_SYSENTER_compat+0x90/0xa2 arch/x86/entry/entry_64_compat.S:137

Showing all locks held in the system:
3 locks held by kworker/u4:2/252:
 #0:  ("writeback"){++++.+}, at: [<ffffffff81189922>] work_static include/linux/workqueue.h:186 [inline]
 #0:  ("writeback"){++++.+}, at: [<ffffffff81189922>] set_work_data kernel/workqueue.c:617 [inline]
 #0:  ("writeback"){++++.+}, at: [<ffffffff81189922>] set_work_pool_and_clear_pending kernel/workqueue.c:644 [inline]
 #0:  ("writeback"){++++.+}, at: [<ffffffff81189922>] process_one_work+0x6f2/0x1610 kernel/workqueue.c:2085
 #1:  ((&(&wb->dwork)->work)){+.+.+.}, at: [<ffffffff8118995c>] process_one_work+0x72c/0x1610 kernel/workqueue.c:2089
 #2:  (&type->s_umount_key#22){++++..}, at: [<ffffffff81579f90>] trylock_super+0x20/0x100 fs/super.c:393
2 locks held by khungtaskd/514:
 #0:  (rcu_read_lock){......}, at: [<ffffffff81373315>] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline]
 #0:  (rcu_read_lock){......}, at: [<ffffffff81373315>] watchdog+0x125/0xa70 kernel/hung_task.c:239
 #1:  (tasklist_lock){.+.+..}, at: [<ffffffff81238300>] debug_show_all_locks+0x70/0x280 kernel/locking/lockdep.c:4336
2 locks held by getty/3764:
 #0:  (&tty->ldisc_sem){++++++}, at: [<ffffffff838b4d52>] ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367
 #1:  (&ldata->atomic_read_lock){+.+.+.}, at: [<ffffffff8200af14>] n_tty_read+0x1f4/0x16c0 drivers/tty/n_tty.c:2133
1 lock held by syz-executor6/29365:
 #0:  (&bdev->bd_mutex){+.+.+.}, at: [<ffffffff81631938>] iterate_bdevs+0xc8/0x260 fs/block_dev.c:1976
1 lock held by syz-executor6/29375:
 #0:  (&bdev->bd_mutex){+.+.+.}, at: [<ffffffff81631938>] iterate_bdevs+0xc8/0x260 fs/block_dev.c:1976

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

NMI backtrace for cpu 0
CPU: 0 PID: 514 Comm: khungtaskd Not tainted 4.9.87-g97d7f1c #2
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801d85a7d00 ffffffff81d95a19 0000000000000000 0000000000000000
 0000000000000000 0000000000000001 ffffffff810bb230 ffff8801d85a7d38
 ffffffff81da0b3d 0000000000000000 0000000000000000 ffff8801b086cc18
Call Trace:
 [<ffffffff81d95a19>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81d95a19>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81da0b3d>] nmi_cpu_backtrace+0xfd/0x120 lib/nmi_backtrace.c:99
 [<ffffffff81da0c77>] nmi_trigger_cpumask_backtrace+0x117/0x190 lib/nmi_backtrace.c:60
 [<ffffffff810bb324>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37
 [<ffffffff813738e0>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline]
 [<ffffffff813738e0>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff813738e0>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff813738e0>] watchdog+0x6f0/0xa70 kernel/hung_task.c:239
 [<ffffffff8119a92d>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff838b6cec>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:374
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 29481 Comm: init Not tainted 4.9.87-g97d7f1c #2
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801c43e6000 task.stack: ffff8801bcc38000
RIP: 0010:[<ffffffff8203b2ab>] 
c [<ffffffff8203b2ab>] inb arch/x86/include/asm/io.h:316 [inline]
RIP: 0010:[<ffffffff8203b2ab>] 
c [<ffffffff8203b2ab>] io_serial_in+0x6b/0x90 drivers/tty/serial/8250/8250_port.c:414
RSP: 0018:ffff8801bcc3f530  EFLAGS: 00000002
RAX: dffffc0000000000 RBX: 00000000000003fd RCX: 0000000000000000
RDX: 00000000000003fd RSI: 0000000000000005 RDI: ffffffff8627e478
RBP: ffff8801bcc3f540 R08: ffffffff85363660 R09: ffff8801bcc38000
R10: 0000000000000008 R11: ffff8801c43e6000 R12: ffffffff8627e440
R13: 0000000000000020 R14: fffffbfff0c4fccf R15: fffffbfff0c4fc91
FS:  00007f5e152167a0(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f5e14929a30 CR3: 00000001b8510000 CR4: 0000000000160670
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffffffff8627e440
c 0000000000002709
c ffff8801bcc3f590
c ffffffff8203cede
c
 ffff8801bcc3f5c8
c ffffffff8627e488
c ffffffff8627e67a
c ffffffff8627e440
c
 0000000000000020
c ffffffff8203d020
c dffffc0000000000
c 0000000000000020
c
Call Trace:
 [<ffffffff8203cede>] serial_in drivers/tty/serial/8250/8250.h:111 [inline]
 [<ffffffff8203cede>] wait_for_xmitr+0x8e/0x1d0 drivers/tty/serial/8250/8250_port.c:1997
 [<ffffffff8203d03f>] serial8250_console_putchar+0x1f/0x60 drivers/tty/serial/8250/8250_port.c:3103
 [<ffffffff8202530c>] uart_console_write+0xac/0xe0 drivers/tty/serial/serial_core.c:1857
 [<ffffffff82048a90>] serial8250_console_write+0x2e0/0x850 drivers/tty/serial/8250/8250_port.c:3169
 [<ffffffff82035e7f>] univ8250_console_write+0x5f/0x70 drivers/tty/serial/8250/8250_core.c:594
 [<ffffffff81265f25>] call_console_drivers.isra.20.constprop.29+0x1a5/0x350 kernel/printk/printk.c:1589
 [<ffffffff81268be5>] console_unlock+0x425/0xb20 kernel/printk/printk.c:2445
 [<ffffffff8126a035>] console_device+0x95/0xc0 kernel/printk/printk.c:2553
 [<ffffffff820041a5>] tty_lookup_driver drivers/tty/tty_io.c:1992 [inline]
 [<ffffffff820041a5>] tty_open_by_driver drivers/tty/tty_io.c:2037 [inline]
 [<ffffffff820041a5>] tty_open+0x425/0xdf0 drivers/tty/tty_io.c:2114
 [<ffffffff8157c4ab>] chrdev_open+0x22b/0x4c0 fs/char_dev.c:392
 [<ffffffff81567297>] do_dentry_open+0x607/0xc60 fs/open.c:766
 [<ffffffff8156ad45>] vfs_open+0x105/0x220 fs/open.c:879
 [<ffffffff815a19cc>] do_last fs/namei.c:3411 [inline]
 [<ffffffff815a19cc>] path_openat+0x5ac/0x2910 fs/namei.c:3534
 [<ffffffff815a7527>] do_filp_open+0x197/0x290 fs/namei.c:3569
 [<ffffffff8156b836>] do_sys_open+0x366/0x620 fs/open.c:1072
 [<ffffffff8156bb1d>] SYSC_open fs/open.c:1090 [inline]
 [<ffffffff8156bb1d>] SyS_open+0x2d/0x40 fs/open.c:1085
 [<ffffffff81006504>] do_syscall_64+0x1a4/0x490 arch/x86/entry/common.c:282
 [<ffffffff838b6b53>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
Code: 
c24 
cc9 
c00 
c00 
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c24 
c38 
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c80 
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c00 
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c17 
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c03 
c5c 
c24 
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c89 
cda 
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c<5b> 
c0f 
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c41 
c5c 
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cc3 
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c88 
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c50 
cff 
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cc2 
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c