binder_alloc: 15530: binder_alloc_buf, no vma
binder: 15530:15533 transaction failed 29189/-3, size 0-0 line 3141
binder: undelivered TRANSACTION_ERROR: 29189
binder: undelivered TRANSACTION_COMPLETE
binder: undelivered TRANSACTION_ERROR: 29201
INFO: task syz-executor4:15494 blocked for more than 120 seconds.
      Not tainted 4.9.105-gd7e64f8 #43
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor4   D29512 15494   3877 0x00000004
 ffff8801d361e000 ffff8801d89e6a00 ffff8801d3a5e4c0 ffff88019f2e8000
 ffff8801db321c18 ffff8801cffff9f0 ffffffff839e8c1d 0000000000000002
 0000000041b58ab3 ffffffff843b9ceb 00ffffff81221500 ffff8801db3224e8
Call Trace:
 [<ffffffff839ea21f>] schedule+0x7f/0x1b0 kernel/sched/core.c:3557
 [<ffffffff81e418a4>] blk_mq_freeze_queue_wait+0x114/0x230 block/blk-mq.c:75
 [<ffffffff81e4ab9d>] blk_freeze_queue block/blk-mq.c:92 [inline]
 [<ffffffff81e4ab9d>] blk_mq_freeze_queue+0x1d/0x20 block/blk-mq.c:101
 [<ffffffff825cb202>] loop_switch drivers/block/loop.c:599 [inline]
 [<ffffffff825cb202>] loop_change_fd drivers/block/loop.c:685 [inline]
 [<ffffffff825cb202>] lo_ioctl+0x722/0x1aa0 drivers/block/loop.c:1350
 [<ffffffff81e57da6>] __blkdev_driver_ioctl block/ioctl.c:294 [inline]
 [<ffffffff81e57da6>] blkdev_ioctl+0x7b6/0x1a70 block/ioctl.c:590
 [<ffffffff81632f4e>] block_ioctl+0xde/0x120 fs/block_dev.c:1688
 [<ffffffff815b2f5c>] vfs_ioctl fs/ioctl.c:43 [inline]
 [<ffffffff815b2f5c>] file_ioctl fs/ioctl.c:493 [inline]
 [<ffffffff815b2f5c>] do_vfs_ioctl+0x1ac/0x11a0 fs/ioctl.c:677
 [<ffffffff815b3fdf>] SYSC_ioctl fs/ioctl.c:694 [inline]
 [<ffffffff815b3fdf>] SyS_ioctl+0x8f/0xc0 fs/ioctl.c:685
 [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282
 [<ffffffff839f9b13>] 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: [<ffffffff81366b9c>] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline]
 #0:  (rcu_read_lock){......}, at: [<ffffffff81366b9c>] watchdog+0x11c/0xa20 kernel/hung_task.c:239
 #1:  (tasklist_lock){.+.+..}, at: [<ffffffff81426180>] debug_show_all_locks+0x79/0x218 kernel/locking/lockdep.c:4336
1 lock held by rsyslogd/3678:
 #0:  (&f->f_pos_lock){+.+.+.}, at: [<ffffffff815d83fc>] __fdget_pos+0xac/0xd0 fs/file.c:781
2 locks held by getty/3776:
 #0:  (&tty->ldisc_sem){++++++}, at: [<ffffffff839f7cc2>] ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367
 #1:  (&ldata->atomic_read_lock){+.+...}, at: [<ffffffff82120062>] n_tty_read+0x202/0x16e0 drivers/tty/n_tty.c:2133
1 lock held by syz-executor4/15494:
 #0:  (&lo->lo_ctl_mutex/1){+.+.+.}, at: [<ffffffff825cab6b>] lo_ioctl+0x8b/0x1aa0 drivers/block/loop.c:1344
1 lock held by syz-executor4/15538:
 #0:  (&lo->lo_ctl_mutex/1){+.+.+.}, at: [<ffffffff825cab6b>] lo_ioctl+0x8b/0x1aa0 drivers/block/loop.c:1344
1 lock held by blkid/15552:
 #0:  (&lo->lo_ctl_mutex/1){+.+.+.}, at: [<ffffffff825cab6b>] lo_ioctl+0x8b/0x1aa0 drivers/block/loop.c:1344

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

NMI backtrace for cpu 0
CPU: 0 PID: 519 Comm: khungtaskd Not tainted 4.9.105-gd7e64f8 #43
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801d86d7d08 ffffffff81eb41a9 0000000000000000 0000000000000000
 0000000000000000 0000000000000001 ffffffff810b96a0 ffff8801d86d7d40
 ffffffff81ebf4a7 0000000000000000 0000000000000000 0000000000000003
Call Trace:
 [<ffffffff81eb41a9>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81eb41a9>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81ebf4a7>] nmi_cpu_backtrace.cold.2+0x48/0x87 lib/nmi_backtrace.c:99
 [<ffffffff81ebf43a>] nmi_trigger_cpumask_backtrace+0x12a/0x14f lib/nmi_backtrace.c:60
 [<ffffffff810b97a4>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37
 [<ffffffff81367134>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline]
 [<ffffffff81367134>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff81367134>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff81367134>] watchdog+0x6b4/0xa20 kernel/hung_task.c:239
 [<ffffffff8119d04d>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff839f9cdc>] 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: 3676 Comm: rs:main Q:Reg Not tainted 4.9.105-gd7e64f8 #43
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801c1d90000 task.stack: ffff8801c1d40000
RIP: 0010:[<ffffffff81230331>] 
c [<ffffffff81230331>] match_held_lock+0x231/0x570 kernel/locking/lockdep.c:3436
RSP: 0018:ffff8801c1d47578  EFLAGS: 00000086
RAX: 0000000000000000 RBX: ffff8801c1d90000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff846deea0 RDI: ffff8801c1d90962
RBP: ffff8801c1d475b0 R08: 0000000000000000 R09: 0000000000000001
R10: 0000000000000000 R11: 1ffff100383b212c R12: ffffed00383b2118
R13: ffff8801c1d908c8 R14: ffffffff846deea0 R15: 0000000000000003
FS:  00007f2393d97700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000001579000 CR3: 00000001cdb0f000 CR4: 00000000001606f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffffffff81230712
c ffff8801c1d908c0
c 0000000000000246
c ffff8801c1d90000
c
 ffffffff846deea0
c ffff8801b7362a90
c ffffffff81754624
c ffff8801c1d475d8
c
 ffffffff81230f44
c 0000000000000003
c 0000000000000008
c 0000000000000000
c
Call Trace:
 [<ffffffff81230f44>] lock_is_held+0xb4/0x140 kernel/locking/lockdep.c:3794
 [<ffffffff8127c593>] rcu_read_lock_sched_held+0x103/0x120 kernel/rcu/update.c:112
 [<ffffffff818066b2>] trace_ext4_journal_start include/trace/events/ext4.h:1743 [inline]
 [<ffffffff818066b2>] __ext4_journal_start_sb+0x202/0x460 fs/ext4/ext4_jbd2.c:68
 [<ffffffff81754624>] __ext4_journal_start fs/ext4/ext4_jbd2.h:318 [inline]
 [<ffffffff81754624>] ext4_truncate+0x434/0x12c0 fs/ext4/inode.c:4233
 [<ffffffff81756d9b>] ext4_truncate_failed_write fs/ext4/truncate.h:15 [inline]
 [<ffffffff81756d9b>] ext4_da_write_begin+0x4eb/0x1020 fs/ext4/inode.c:3015
 [<ffffffff81436151>] generic_perform_write+0x301/0x510 mm/filemap.c:2740
 [<ffffffff8143dbe2>] __generic_file_write_iter+0x352/0x540 mm/filemap.c:2865
 [<ffffffff8172d2f3>] ext4_file_write_iter+0x463/0xd90 fs/ext4/file.c:165
 [<ffffffff8156ef20>] new_sync_write fs/read_write.c:496 [inline]
 [<ffffffff8156ef20>] __vfs_write+0x3e0/0x580 fs/read_write.c:509
 [<ffffffff81572d17>] vfs_write+0x187/0x530 fs/read_write.c:557
 [<ffffffff81576b49>] SYSC_write fs/read_write.c:604 [inline]
 [<ffffffff81576b49>] SyS_write+0xd9/0x1c0 fs/read_write.c:596
 [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282
 [<ffffffff839f9b13>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
Code: 
c48 
cc1 
cea 
c03 
c80 
c3c 
c02 
c00 
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c85 
cf6 
c02 
c00 
c00 
c48 
c8b 
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c20 
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c58 
c85 
c48 
c85 
cdb 
c75 
c25 
c31 
cc0 
c48 
c83 
cc4 
c08 
c5b 
c41 
c5c 
c41 
c5d 
c41 
c5e 
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c5d 
c<c3> 
c48 
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c08 
cb8 
c01 
c00 
c00 
c00 
c5b 
c41 
c5c 
c41 
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c41 
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c41 
c5f 
c5d 
cc3 
c