IPVS: Creating netns size=2536 id=97
IPVS: stopping master sync thread 13781 ...
INFO: task syz-executor4:32319 blocked for more than 120 seconds.
      Not tainted 4.9.107-gdb2c520 #49
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor4   D28928 32319   3891 0x00000004
 ffff880193601800 ffff8801c58c1a40 ffff8801c58c1f80 ffff880196156000
 ffff8801db221c18 ffff8801cbacf890 ffffffff839e8c1d 1ffff10039759f06
 ffffffff85550f68 0000000041b58ab3 00ffffff843c2388 ffff8801db2224e8
Call Trace:
 [<ffffffff839ea21f>] schedule+0x7f/0x1b0 kernel/sched/core.c:3557
 [<ffffffff839f6631>] schedule_timeout+0x861/0xf70 kernel/time/timer.c:1768
 [<ffffffff839e83fa>] io_schedule_timeout+0x1ba/0x390 kernel/sched/core.c:5180
 [<ffffffff839eb669>] io_schedule include/linux/sched.h:460 [inline]
 [<ffffffff839eb669>] bit_wait_io+0x19/0xa0 kernel/sched/wait.c:582
 [<ffffffff839eaf0e>] __wait_on_bit_lock+0xce/0x1c0 kernel/sched/wait.c:421
 [<ffffffff8143451f>] __lock_page+0xff/0x160 mm/filemap.c:934
 [<ffffffff8143a2e9>] lock_page include/linux/pagemap.h:454 [inline]
 [<ffffffff8143a2e9>] pagecache_get_page+0x409/0x720 mm/filemap.c:1216
 [<ffffffff8146bbe6>] find_lock_page include/linux/pagemap.h:284 [inline]
 [<ffffffff8146bbe6>] truncate_inode_pages_range+0xca6/0x1290 mm/truncate.c:320
 [<ffffffff816327fd>] blkdev_fallocate+0x21d/0x440 fs/block_dev.c:1817
 [<ffffffff81568629>] vfs_fallocate+0x359/0x600 fs/open.c:329
 [<ffffffff8156b533>] SYSC_fallocate fs/open.c:352 [inline]
 [<ffffffff8156b533>] SyS_fallocate+0x53/0x90 fs/open.c:346
 [<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: [<ffffffff8136662c>] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline]
 #0:  (rcu_read_lock){......}, at: [<ffffffff8136662c>] watchdog+0x11c/0xa20 kernel/hung_task.c:239
 #1:  (tasklist_lock){.+.+..}, at: [<ffffffff81425cb7>] debug_show_all_locks+0x79/0x218 kernel/locking/lockdep.c:4336
2 locks held by getty/3777:
 #0:  (&tty->ldisc_sem){++++++}, at: [<ffffffff839f7cc2>] ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367
 #1:  (&ldata->atomic_read_lock){+.+.+.}, at: [<ffffffff8211fc62>] n_tty_read+0x202/0x16e0 drivers/tty/n_tty.c:2133
1 lock held by syz-executor4/32319:
 #0:  (sb_writers){.+.+.+}, at: [<ffffffff815685cb>] sb_start_write include/linux/fs.h:1573 [inline]
 #0:  (sb_writers){.+.+.+}, at: [<ffffffff815685cb>] vfs_fallocate+0x2fb/0x600 fs/open.c:328
1 lock held by syz-executor0/32335:
 #0:  (sb_writers){.+.+.+}, at: [<ffffffff815685cb>] sb_start_write include/linux/fs.h:1573 [inline]
 #0:  (sb_writers){.+.+.+}, at: [<ffffffff815685cb>] vfs_fallocate+0x2fb/0x600 fs/open.c:328
1 lock held by syz-executor0/32373:
 #0:  (sb_writers){.+.+.+}, at: [<ffffffff815685cb>] sb_start_write include/linux/fs.h:1573 [inline]
 #0:  (sb_writers){.+.+.+}, at: [<ffffffff815685cb>] vfs_fallocate+0x2fb/0x600 fs/open.c:328

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

NMI backtrace for cpu 0
CPU: 0 PID: 519 Comm: khungtaskd Not tainted 4.9.107-gdb2c520 #49
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801d84b7d08 ffffffff81eb3da9 0000000000000000 0000000000000000
 0000000000000000 0000000000000001 ffffffff810b96a0 ffff8801d84b7d40
 ffffffff81ebf0a7 0000000000000000 0000000000000000 0000000000000003
Call Trace:
 [<ffffffff81eb3da9>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81eb3da9>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81ebf0a7>] nmi_cpu_backtrace.cold.2+0x48/0x87 lib/nmi_backtrace.c:99
 [<ffffffff81ebf03a>] 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
 [<ffffffff81366bc4>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline]
 [<ffffffff81366bc4>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff81366bc4>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff81366bc4>] 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: 3678 Comm: rs:main Q:Reg Not tainted 4.9.107-gdb2c520 #49
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801c9689800 task.stack: ffff8801c28a8000
RIP: 0010:[<ffffffff81d09459>] 
c [<ffffffff81d09459>] selinux_file_permission+0x1d9/0x470 security/selinux/hooks.c:3382
RSP: 0018:ffff8801c28afd50  EFLAGS: 00000a07
RAX: dffffc0000000000 RBX: ffff8801c2881000 RCX: 0000000000000003
RDX: 0000000000000000 RSI: ffffffff81d093eb RDI: ffff8801c59e82d4
RBP: ffff8801c28afd80 R08: ffff8801c968a0e8 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000002
R13: ffff8801c4b09d40 R14: ffff8801c2881020 R15: ffff8801c59e82b8
FS:  00007f3c2d37c700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000001b62b10 CR3: 00000001d4158000 CR4: 00000000001606f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffff880100000001
c ffffffff8483bb80
c dffffc0000000000
c ffff8801c2881000
c
 0000000000000002
c 0000000000000001
c ffff8801c28afdb8
c ffffffff81cf0593
c
 ffffffff815d5987
c 0000000000000002
c ffff8801c2881000
c 0000000000000400
c
Call Trace:
 [<ffffffff81cf0593>] security_file_permission+0x83/0x1f0 security/security.c:778
 [<ffffffff815721ee>] rw_verify_area+0xde/0x2b0 fs/read_write.c:424
 [<ffffffff81572839>] vfs_write+0xf9/0x530 fs/read_write.c:552
 [<ffffffff815766f9>] SYSC_write fs/read_write.c:604 [inline]
 [<ffffffff815766f9>] 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: 
cc0 
c03 
c38 
cd0 
c7c 
c08 
c84 
cd2 
c0f 
c85 
c07 
c02 
c00 
c00 
c49 
c8d 
c7f 
c1c 
c41 
c8b 
c4d 
c08 
c48 
cb8 
c00 
c00 
c00 
c00 
c00 
cfc 
cff 
cdf 
c48 
c89 
cfa 
c48 
cc1 
cea 
c03 
c0f 
cb6 
c14 
c02 
c<48> 
c89 
cf8 
c83 
ce0 
c07 
c83 
cc0 
c03 
c38 
cd0 
c7c 
c08 
c84 
cd2 
c0f 
c85 
cdf 
c01 
c00 
c00 
c