syz-executor4 (11215) used greatest stack depth: 21296 bytes left
------------[ cut here ]------------
kernel BUG at fs/ext4/inode.c:2462!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
Modules linked in:
CPU: 1 PID: 11344 Comm: syz-executor1 Not tainted 4.4.161+ #110
task: ffff8801d6c10000 task.stack: ffff8800b7978000
RIP: 0010:[<ffffffff816400d0>]  [<ffffffff816400d0>] mpage_prepare_extent_to_map+0x670/0x8e0 fs/ext4/inode.c:2462
RSP: 0018:ffff8800b797f830  EFLAGS: 00010293
RAX: ffff8801d6c10000 RBX: ffffea000738db80 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff816400d0 RDI: ffffea000738db90
RBP: ffff8800b797f9e8 R08: ffff8801d6c108c8 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000
R13: 0000000000000001 R14: dffffc0000000000 R15: ffff8800b797fb30
FS:  0000000001b09940(0063) GS:ffff8801db700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000072c000 CR3: 00000001d650f000 CR4: 00000000001606b0
Stack:
 1ffff10016f2ff14 ffff8800b797f8c0 ffff8800b797fb38 ffff8800b797fb40
 00000000b797f8d8 0007ffffffffffff ffff8801cec433a8 000000090000000c
 7fffffffffffffff ffff8800b797f900 ffff8800b797fb48 ffffed0016f2ff67
Call Trace:
 [<ffffffff8164f32c>] ext4_writepages+0xd4c/0x2c20 fs/ext4/inode.c:2617
 [<ffffffff813d763f>] do_writepages+0xef/0x1d0 mm/page-writeback.c:2334
 [<ffffffff813b90c9>] __filemap_fdatawrite_range+0x1a9/0x250 mm/filemap.c:347
 [<ffffffff813b91c3>] __filemap_fdatawrite mm/filemap.c:355 [inline]
 [<ffffffff813b91c3>] filemap_flush+0x23/0x30 mm/filemap.c:380
 [<ffffffff816469c8>] ext4_alloc_da_blocks+0x108/0x3c0 fs/ext4/inode.c:2993
 [<ffffffff8162ae2f>] ext4_release_file+0x1ff/0x2e0 fs/ext4/file.c:42
 [<ffffffff81496de5>] __fput+0x235/0x6f0 fs/file_table.c:208
 [<ffffffff81497325>] ____fput+0x15/0x20 fs/file_table.c:244
 [<ffffffff8112f19f>] task_work_run+0x10f/0x190 kernel/task_work.c:115
 [<ffffffff81003edd>] tracehook_notify_resume include/linux/tracehook.h:191 [inline]
 [<ffffffff81003edd>] exit_to_usermode_loop+0x13d/0x160 arch/x86/entry/common.c:254
 [<ffffffff81005924>] prepare_exit_to_usermode arch/x86/entry/common.c:287 [inline]
 [<ffffffff81005924>] syscall_return_slowpath+0x254/0x2d0 arch/x86/entry/common.c:352
 [<ffffffff82705cad>] int_ret_from_sys_call+0x25/0xa3
Code: 48 89 df e8 23 45 d7 ff e9 32 ff ff ff e8 49 6e cc ff 48 89 df e8 b1 5e d7 ff e9 fa fd ff ff e8 37 6e cc ff 0f 0b e8 30 6e cc ff <0f> 0b 31 c0 89 85 b0 fe ff ff e8 21 6e cc ff 8b 85 18 ff ff ff 
RIP  [<ffffffff816400d0>] mpage_prepare_extent_to_map+0x670/0x8e0 fs/ext4/inode.c:2462
 RSP <ffff8800b797f830>
---[ end trace b4bef414d53d053a ]---