b_state=0x00000029, b_size=512
device loop0 blocksize: 1024
__find_get_block_slow() failed. block=5, b_blocknr=8
b_state=0x00000029, b_size=512
device loop0 blocksize: 1024
INFO: task syz-executor0:24863 blocked for more than 140 seconds.
      Not tainted 4.9.122-g54068d6 #26
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor0   D27688 24863   3868 0x00000004
 ffff88019a244800 ffff88019c691500 ffff8801d7fca4c0 ffff880199c23000
 ffff8801db221c18 ffff88019e19f988 ffffffff839efdcd ffffffff812378c7
 0000000000000000 ffff88019a2450c0 0000000600000007 ffff8801db2224e8
Call Trace:
 [<ffffffff839f13cf>] schedule+0x7f/0x1b0 kernel/sched/core.c:3553
 [<ffffffff839fca08>] __rwsem_down_write_failed_common kernel/locking/rwsem-xadd.c:526 [inline]
 [<ffffffff839fca08>] rwsem_down_write_failed+0x598/0x990 kernel/locking/rwsem-xadd.c:555
 [<ffffffff81eecb47>] call_rwsem_down_write_failed+0x17/0x30 arch/x86/lib/rwsem.S:105
 [<ffffffff839fa7dc>] __down_write arch/x86/include/asm/rwsem.h:125 [inline]
 [<ffffffff839fa7dc>] down_write+0x5c/0xa0 kernel/locking/rwsem.c:54
 [<ffffffff8144001d>] inode_lock include/linux/fs.h:766 [inline]
 [<ffffffff8144001d>] generic_file_write_iter+0x9d/0x610 mm/filemap.c:2903
 [<ffffffff815727a0>] new_sync_write fs/read_write.c:496 [inline]
 [<ffffffff815727a0>] __vfs_write+0x3e0/0x580 fs/read_write.c:509
 [<ffffffff81576597>] vfs_write+0x187/0x530 fs/read_write.c:557
 [<ffffffff8157a3c9>] SYSC_write fs/read_write.c:604 [inline]
 [<ffffffff8157a3c9>] SyS_write+0xd9/0x1c0 fs/read_write.c:596
 [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282
 [<ffffffff83a00cd3>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb

Showing all locks held in the system:
2 locks held by khungtaskd/519:
 #0:  (rcu_read_lock){......}, at: [<ffffffff81368a5c>] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline]
 #0:  (rcu_read_lock){......}, at: [<ffffffff81368a5c>] watchdog+0x11c/0xa20 kernel/hung_task.c:239
 #1:  (tasklist_lock){.+.?..}, at: [<ffffffff814282c8>] debug_show_all_locks+0x79/0x218 kernel/locking/lockdep.c:4336
1 lock held by rsyslogd/3678:
 #0:  (&f->f_pos_lock){+.+.+.}, at: [<ffffffff815dbb4c>] __fdget_pos+0xac/0xd0 fs/file.c:781
2 locks held by getty/3774:
 #0:  (&tty->ldisc_sem){++++++}, at: [<ffffffff839fee72>] ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367
 #1:  (&ldata->atomic_read_lock){+.+...}, at: [<ffffffff82124562>] n_tty_read+0x202/0x16e0 drivers/tty/n_tty.c:2142
3 locks held by syz-executor0/24863:
 #0:  (&f->f_pos_lock){+.+.+.}, at: [<ffffffff815dbb4c>] __fdget_pos+0xac/0xd0 fs/file.c:781
 #1:  (sb_writers#16){.+.+.+}, at: [<ffffffff815767be>] file_start_write include/linux/fs.h:2640 [inline]
 #1:  (sb_writers#16){.+.+.+}, at: [<ffffffff815767be>] vfs_write+0x3ae/0x530 fs/read_write.c:556
 #2:  (&sb->s_type->i_mutex_key#22){++++++}, at: [<ffffffff8144001d>] inode_lock include/linux/fs.h:766 [inline]
 #2:  (&sb->s_type->i_mutex_key#22){++++++}, at: [<ffffffff8144001d>] generic_file_write_iter+0x9d/0x610 mm/filemap.c:2903

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

NMI backtrace for cpu 1
CPU: 1 PID: 519 Comm: khungtaskd Not tainted 4.9.122-g54068d6 #26
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801d851fd08 ffffffff81eb8829 0000000000000000 0000000000000001
 0000000000000001 0000000000000001 ffffffff810b9fa0 ffff8801d851fd40
 ffffffff81ec3b67 0000000000000001 0000000000000000 0000000000000003
Call Trace:
 [<ffffffff81eb8829>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81eb8829>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81ec3b67>] nmi_cpu_backtrace.cold.2+0x48/0x87 lib/nmi_backtrace.c:99
 [<ffffffff81ec3afa>] nmi_trigger_cpumask_backtrace+0x12a/0x14f lib/nmi_backtrace.c:60
 [<ffffffff810ba0a4>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37
 [<ffffffff81368ff4>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline]
 [<ffffffff81368ff4>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff81368ff4>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff81368ff4>] watchdog+0x6b4/0xa20 kernel/hung_task.c:239
 [<ffffffff8119f38d>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff83a00e9c>] 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: 24873 Comm: syz-executor2 Not tainted 4.9.122-g54068d6 #26
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801d6c30000 task.stack: ffff8801cc508000
RIP: 0010:[<ffffffff8153e3b0>] 
c [<ffffffff8153e3b0>] kasan_unpoison_shadow+0x0/0x50 mm/kasan/kasan.c:50
RSP: 0018:ffff8801db207b10  EFLAGS: 00000206
RAX: 0000000048000000 RBX: ffffea00067a4400 RCX: 0000000000000000
RDX: ffff8801da001280 RSI: 0000000000000200 RDI: ffff88019e911b80
RBP: ffff8801db207b30 R08: ffff8801db207858 R09: 000000006580e10d
R10: ffffed003b640efe R11: ffff8801db2077f7 R12: ffff88019e911b80
R13: 0000000000000200 R14: 0000000002080020 R15: ffff8801d9914640
FS:  00007fda36ff4700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fdf845f5a8b CR3: 00000001bff5f000 CR4: 00000000001606f0
DR0: 00000000200001c0 DR1: 00000000200001c0 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Stack:
 ffffffff81537354
c 1ffff1003b640f69
c ffff88019e911b80
c ffff8801cb9d5dc0
c
 ffff8801db207bd0
c ffffffff83039303
c 0000004800000000
c 0000000041b58ab3
c
 ffffffff84417e92
c ffffffff830391d0
c ffffffff83582b00
c ffff8801db207b00
c
Call Trace:
 [<ffffffff83039303>] __alloc_skb+0x133/0x5b0 net/core/skbuff.c:238
 [<ffffffff835bce74>] alloc_skb include/linux/skbuff.h:919 [inline]
 [<ffffffff835bce74>] ndisc_alloc_skb+0x144/0x330 net/ipv6/ndisc.c:401
 [<ffffffff835c206f>] ndisc_send_rs+0x2ff/0x670 net/ipv6/ndisc.c:645
 [<ffffffff835824e7>] addrconf_rs_timer+0x287/0x5a0 net/ipv6/addrconf.c:3751
 [<ffffffff8129acc3>] call_timer_fn+0x163/0x6e0 kernel/time/timer.c:1319
 [<ffffffff812a1e27>] expire_timers kernel/time/timer.c:1359 [inline]
 [<ffffffff812a1e27>] __run_timers kernel/time/timer.c:1658 [inline]
 [<ffffffff812a1e27>] run_timer_softirq+0x1047/0x1590 kernel/time/timer.c:1684
 [<ffffffff83a078c0>] __do_softirq+0x210/0x940 kernel/softirq.c:288
 [<ffffffff8114d514>] invoke_softirq kernel/softirq.c:368 [inline]
 [<ffffffff8114d514>] irq_exit+0x114/0x150 kernel/softirq.c:409
 [<ffffffff83a064a1>] exiting_irq arch/x86/include/asm/apic.h:669 [inline]
 [<ffffffff83a064a1>] smp_apic_timer_interrupt+0x81/0xa0 arch/x86/kernel/apic/apic.c:962
 [<ffffffff83a02630>] apic_timer_interrupt+0xa0/0xb0 arch/x86/entry/entry_64.S:648
 <EOI> 
d [<ffffffff812610d3>] ? console_unlock+0x7b3/0xb40 kernel/printk/printk.c:2451
 [<ffffffff812618a8>] vprintk_emit+0x448/0x790 kernel/printk/printk.c:1903
 [<ffffffff81261c18>] vprintk+0x28/0x30 kernel/printk/printk.c:1913
 [<ffffffff81261c3d>] vprintk_default+0x1d/0x30 kernel/printk/printk.c:1914
 [<ffffffff8142f09d>] vprintk_func kernel/printk/internal.h:36 [inline]
 [<ffffffff8142f09d>] printk+0xaf/0xd7 kernel/printk/printk.c:1975
 [<ffffffff82ec7131>] binder_thread_write.cold.77+0xeb0/0x1285 drivers/android/binder.c:3917
 [<ffffffff82e724db>] binder_ioctl_write_read.isra.42+0x1eb/0x810 drivers/android/binder.c:4628
 [<ffffffff82e73202>] binder_ioctl+0x702/0x1160 drivers/android/binder.c:4767
 [<ffffffff815b67dc>] vfs_ioctl fs/ioctl.c:43 [inline]
 [<ffffffff815b67dc>] file_ioctl fs/ioctl.c:493 [inline]
 [<ffffffff815b67dc>] do_vfs_ioctl+0x1ac/0x11a0 fs/ioctl.c:677
 [<ffffffff815b785f>] SYSC_ioctl fs/ioctl.c:694 [inline]
 [<ffffffff815b785f>] SyS_ioctl+0x8f/0xc0 fs/ioctl.c:685
 [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282
 [<ffffffff83a00cd3>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
Code: 
cc3 
c66 
c2e 
c0f 
c1f 
c84 
c00 
c00 
c00 
c00 
c00 
c55 
c48 
c89 
ce5 
c65 
c48 
c8b 
c04 
c25 
cc0 
c7d 
c01 
c00 
c83 
ca8 
c68 
c12 
c00 
c00 
c01 
c5d 
cc3 
c66 
c2e 
c0f 
c1f 
c84 
c00 
c00 
c00 
c00 
c00 
c<48> 
c89 
cf8 
c55 
c48 
cc1 
cef 
c03 
c48 
c01 
cf0 
c48 
c89 
ce5 
c41 
c54 
c49 
c89 
cf4 
c48 
cc1 
c