binder: undelivered TRANSACTION_ERROR: 29189
binder: undelivered TRANSACTION_ERROR: 29201
INFO: task syz-executor2:5635 blocked for more than 120 seconds.
      Not tainted 4.9.92-g13b40d3 #72
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor2   D29008  5635   3826 0x00000004
 ffff88019bbd8000 ffff8801d6f55f80 ffff8801d74f5a40 ffff8801d75be000
 ffff8801db221b98 ffff8801d7007b48 ffffffff838a76cb 0000000000000001
 0000000000000007 00ff88019bbd8000 ffff8801db222468 ffff8801db222490
Call Trace:
 [<ffffffff838a8c6f>] schedule+0x7f/0x1b0 kernel/sched/core.c:3551
 [<ffffffff838a95f3>] schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3584
 [<ffffffff838ae392>] __mutex_lock_common kernel/locking/mutex.c:582 [inline]
 [<ffffffff838ae392>] mutex_lock_nested+0x312/0x870 kernel/locking/mutex.c:621
 [<ffffffff824ba226>] loop_control_ioctl+0x176/0x300 drivers/block/loop.c:1913
 [<ffffffff815add6a>] vfs_ioctl fs/ioctl.c:43 [inline]
 [<ffffffff815add6a>] do_vfs_ioctl+0x1aa/0x1140 fs/ioctl.c:679
 [<ffffffff815aed8f>] SYSC_ioctl fs/ioctl.c:694 [inline]
 [<ffffffff815aed8f>] SyS_ioctl+0x8f/0xc0 fs/ioctl.c:685
 [<ffffffff81006504>] do_syscall_64+0x1a4/0x490 arch/x86/entry/common.c:282
 [<ffffffff838b8593>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb

Showing all locks held in the system:
2 locks held by khungtaskd/515:
 #0:  (rcu_read_lock){......}, at: [<ffffffff813722b5>] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline]
 #0:  (rcu_read_lock){......}, at: [<ffffffff813722b5>] watchdog+0x125/0xa70 kernel/hung_task.c:239
 #1:  (tasklist_lock){.+.+..}, at: [<ffffffff81236de0>] debug_show_all_locks+0x70/0x280 kernel/locking/lockdep.c:4336
1 lock held by rsyslogd/3619:
 #0:  (&f->f_pos_lock){+.+.+.}, at: [<ffffffff815d316f>] __fdget_pos+0x9f/0xc0 fs/file.c:781
2 locks held by getty/3724:
 #0:  (&tty->ldisc_sem){++++++}, at: [<ffffffff838b67a2>] ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367
 #1:  (&ldata->atomic_read_lock){+.+...}, at: [<ffffffff8200a8f4>] n_tty_read+0x1f4/0x16c0 drivers/tty/n_tty.c:2133
2 locks held by syz-executor2/5635:
 #0:  (loop_index_mutex){+.+.+.}, at: [<ffffffff824ba12a>] loop_control_ioctl+0x7a/0x300 drivers/block/loop.c:1899
 #1:  (&lo->lo_ctl_mutex#2){+.+.+.}, at: [<ffffffff824ba226>] loop_control_ioctl+0x176/0x300 drivers/block/loop.c:1913
1 lock held by syz-executor2/5669:
 #0:  (loop_index_mutex){+.+.+.}, at: [<ffffffff824ba12a>] loop_control_ioctl+0x7a/0x300 drivers/block/loop.c:1899
1 lock held by syz-executor2/5670:
 #0:  (loop_index_mutex){+.+.+.}, at: [<ffffffff824ba12a>] loop_control_ioctl+0x7a/0x300 drivers/block/loop.c:1899
1 lock held by syz-executor2/5672:
 #0:  (loop_index_mutex){+.+.+.}, at: [<ffffffff824ba12a>] loop_control_ioctl+0x7a/0x300 drivers/block/loop.c:1899
1 lock held by syz-executor2/5674:
 #0:  (loop_index_mutex){+.+.+.}, at: [<ffffffff824ba12a>] loop_control_ioctl+0x7a/0x300 drivers/block/loop.c:1899
1 lock held by syz-executor2/5675:
 #0:  (loop_index_mutex){+.+.+.}, at: [<ffffffff824ba12a>] loop_control_ioctl+0x7a/0x300 drivers/block/loop.c:1899
1 lock held by syz-executor1/5643:
 #0:  (&bdev->bd_mutex){+.+.+.}, at: [<ffffffff8162db1c>] __blkdev_get+0x10c/0xd50 fs/block_dev.c:1268
2 locks held by syz-executor6/5650:
 #0:  (&lo->lo_ctl_mutex/1){+.+.+.}, at: [<ffffffff824b7c6f>] lo_ioctl+0x8f/0x1990 drivers/block/loop.c:1337
 #1:  (&bdev->bd_mutex){+.+.+.}, at: [<ffffffff81d36f9e>] blkdev_reread_part+0x1e/0x40 block/ioctl.c:189
1 lock held by syz-executor6/5676:
 #0:  (&bdev->bd_mutex){+.+.+.}, at: [<ffffffff8162db1c>] __blkdev_get+0x10c/0xd50 fs/block_dev.c:1268
1 lock held by syz-executor6/5680:
 #0:  (&lo->lo_ctl_mutex/1){+.+.+.}, at: [<ffffffff824b7c6f>] lo_ioctl+0x8f/0x1990 drivers/block/loop.c:1337
1 lock held by syz-executor6/5681:
 #0:  (&lo->lo_ctl_mutex/1){+.+.+.}, at: [<ffffffff824b7c6f>] lo_ioctl+0x8f/0x1990 drivers/block/loop.c:1337
2 locks held by blkid/5661:
 #0:  (&bdev->bd_mutex){+.+.+.}, at: [<ffffffff8162d2ec>] __blkdev_put+0xbc/0x7e0 fs/block_dev.c:1579
 #1:  (loop_index_mutex){+.+.+.}, at: [<ffffffff824ba54f>] lo_release+0x1f/0x160 drivers/block/loop.c:1590
2 locks held by blkid/5664:
 #0:  (&bdev->bd_mutex){+.+.+.}, at: [<ffffffff8162db1c>] __blkdev_get+0x10c/0xd50 fs/block_dev.c:1268
 #1:  (loop_index_mutex){+.+.+.}, at: [<ffffffff824b2bcb>] lo_open+0x1b/0xa0 drivers/block/loop.c:1548
2 locks held by blkid/5668:
 #0:  (&bdev->bd_mutex){+.+.+.}, at: [<ffffffff8162db1c>] __blkdev_get+0x10c/0xd50 fs/block_dev.c:1268
 #1:  (loop_index_mutex){+.+.+.}, at: [<ffffffff824b2bcb>] lo_open+0x1b/0xa0 drivers/block/loop.c:1548

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

NMI backtrace for cpu 1
CPU: 1 PID: 515 Comm: khungtaskd Not tainted 4.9.92-g13b40d3 #72
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801d8bdfd00 ffffffff81d95109 0000000000000000 0000000000000001
 0000000000000001 0000000000000001 ffffffff810bb8f0 ffff8801d8bdfd38
 ffffffff81da025d 0000000000000001 0000000000000000 ffff8801d74c4c18
Call Trace:
 [<ffffffff81d95109>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81d95109>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81da025d>] nmi_cpu_backtrace+0xfd/0x120 lib/nmi_backtrace.c:99
 [<ffffffff81da0397>] nmi_trigger_cpumask_backtrace+0x117/0x190 lib/nmi_backtrace.c:60
 [<ffffffff810bb9e4>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37
 [<ffffffff81372880>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline]
 [<ffffffff81372880>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff81372880>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff81372880>] watchdog+0x6f0/0xa70 kernel/hung_task.c:239
 [<ffffffff8119c0dd>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff838b875c>] 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: 3617 Comm: rs:main Q:Reg Not tainted 4.9.92-g13b40d3 #72
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801be141800 task.stack: ffff8801c33d8000
RIP: 0010:[<ffffffff81db2e99>] 
c [<ffffffff81db2e99>] memcmp+0x99/0x160 lib/string.c:768
RSP: 0018:ffff8801c33df068  EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffff8801c33df12a RCX: 0000000000000002
RDX: ffff8801c33df198 RSI: ffff8801c01db61a RDI: 0000000000000001
RBP: ffff8801c33df090 R08: ffffed003867be17 R09: ffff8801c33df118
R10: 0000000000000008 R11: ffffed003867be16 R12: dffffc0000000000
R13: ffff8801c01db5f0 R14: 0000000000000080 R15: 0000000000000010
FS:  00007fac3e562700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f3fb468e000 CR3: 00000001c02e0000 CR4: 0000000000160670
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffff8801c33df0e0
c ffffffff8107c7fd
c 0000000000000000
c 000000006b2e8618
c
 ffff8801c33df100
c ffff8801c33df0f0
c ffffffff81e47a92
c ffff880102408040
c
 00000000000e8618
c ffff8801c33df118
c 0000000000000000
c 95db5a96afdc6ff5
c
Call Trace:
 [<ffffffff81e47a92>] find_stack lib/stackdepot.c:176 [inline]
 [<ffffffff81e47a92>] depot_save_stack+0x122/0x4a0 lib/stackdepot.c:225
 [<ffffffff8153c583>] save_stack+0xa3/0xd0 mm/kasan/kasan.c:511
 [<ffffffff8153c8ed>] set_track mm/kasan/kasan.c:517 [inline]
 [<ffffffff8153c8ed>] kasan_kmalloc+0xad/0xe0 mm/kasan/kasan.c:609
 [<ffffffff81538abd>] __kmalloc+0x11d/0x310 mm/slub.c:3741
 [<ffffffff817e5dc3>] kmalloc include/linux/slab.h:495 [inline]
 [<ffffffff817e5dc3>] kzalloc include/linux/slab.h:636 [inline]
 [<ffffffff817e5dc3>] ext4_ext_remove_space+0x19f3/0x3a20 fs/ext4/extents.c:2935
 [<ffffffff817eec31>] ext4_ext_truncate+0x181/0x280 fs/ext4/extents.c:4658
 [<ffffffff8174034e>] ext4_truncate+0xaae/0x12e0 fs/ext4/inode.c:4260
 [<ffffffff817424e3>] ext4_truncate_failed_write fs/ext4/truncate.h:15 [inline]
 [<ffffffff817424e3>] ext4_da_write_begin+0x5a3/0x1020 fs/ext4/inode.c:3015
 [<ffffffff814335b1>] generic_perform_write+0x261/0x500 mm/filemap.c:2741
 [<ffffffff8143b108>] __generic_file_write_iter+0x348/0x570 mm/filemap.c:2866
 [<ffffffff81718c6f>] ext4_file_write_iter+0x99f/0xe00 fs/ext4/file.c:165
 [<ffffffff8156dfdf>] new_sync_write fs/read_write.c:496 [inline]
 [<ffffffff8156dfdf>] __vfs_write+0x4bf/0x680 fs/read_write.c:509
 [<ffffffff8156f909>] vfs_write+0x189/0x530 fs/read_write.c:557
 [<ffffffff815733c9>] SYSC_write fs/read_write.c:604 [inline]
 [<ffffffff815733c9>] SyS_write+0xd9/0x1b0 fs/read_write.c:596
 [<ffffffff81006504>] do_syscall_64+0x1a4/0x490 arch/x86/entry/common.c:282
 [<ffffffff838b8593>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
Code: 
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c<48> 
c89 
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c