audit: type=1400 audit(1538823487.098:44): avc:  denied  { mounton } for  pid=5499 comm="syz-executor3" path="pipe:[15929]" dev="pipefs" ino=15929 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=fifo_file permissive=1
------------[ cut here ]------------
kernel BUG at fs/ext4/inode.c:2062!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
Modules linked in:
CPU: 0 PID: 354 Comm: jbd2/sda1-8 Not tainted 4.9.131+ #102
task: ffff8801d51ac740 task.stack: ffff8801d4c08000
RIP: 0010:[<ffffffff816d8405>]  [<ffffffff816d8405>] ext4_writepage+0xbe5/0x1860 fs/ext4/inode.c:2062
RSP: 0018:ffff8801d4c0f4c0  EFLAGS: 00010293
RAX: ffff8801d51ac740 RBX: 0000000000008200 RCX: ffffea00069b4400
RDX: 0000000000000000 RSI: ffffffff816d8405 RDI: ffff8801a7119260
RBP: ffff8801d4c0f5c0 R08: 0000000000024bb0 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff82ad73a0
R13: ffffea00069b4400 R14: ffffea00069b4400 R15: ffffea00069b4400
FS:  0000000000000000(0000) GS:ffff8801db600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f39ddc07330 CR3: 00000001d4d91000 CR4: 00000000001606b0
Stack:
 ffff8801d4c0f5b8 ffffffff814c1f1d ffffea00069b4410 ffffea00069b4408
 1ffff1003a981ea3 ffff8801d4c0fb50 ffff8801a7119210 ffff8801d4c0f6b8
 ffffea00069b4400 0000100000000001 ffff8801d51acfe8 0000000041b58ab3
Call Trace:
 [<ffffffff8142eb84>] __writepage+0x64/0xc0 mm/page-writeback.c:2293
 [<ffffffff8142d5b5>] write_cache_pages+0x4d5/0xe80 mm/page-writeback.c:2231
 [<ffffffff814325ea>] generic_writepages+0xda/0x150 mm/page-writeback.c:2317
 [<ffffffff817f100a>] journal_submit_inode_data_buffers fs/jbd2/commit.c:201 [inline]
 [<ffffffff817f100a>] journal_submit_data_buffers fs/jbd2/commit.c:234 [inline]
 [<ffffffff817f100a>] jbd2_journal_commit_transaction+0xdea/0x65e0 fs/jbd2/commit.c:536
 [<ffffffff818097aa>] kjournald2+0x22a/0x830 fs/jbd2/journal.c:224
 [<ffffffff811429fd>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff8280399c>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:373
Code: 4d 85 ed 75 ba e8 7c 31 c4 ff 65 ff 0d a5 f9 93 7e 0f 85 34 f5 ff ff e8 6a 31 c4 ff e8 bd 9e 92 ff e9 25 f5 ff ff e8 5b 31 c4 ff <0f> 0b e8 54 31 c4 ff 48 8b 85 40 ff ff ff f0 80 60 01 fe e8 43 
RIP  [<ffffffff816d8405>] ext4_writepage+0xbe5/0x1860 fs/ext4/inode.c:2062
 RSP <ffff8801d4c0f4c0>
---[ end trace 321f0109c8423b38 ]---