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kernel BUG at fs/ext4/inode.c:2462!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
Modules linked in:
CPU: 0 PID: 19820 Comm: syz-executor1 Not tainted 4.4.166+ #4
task: ffff8801d39297c0 task.stack: ffff8801c2ec8000
RIP: 0010:[<ffffffff81640f40>]  [<ffffffff81640f40>] mpage_prepare_extent_to_map+0x670/0x8e0 fs/ext4/inode.c:2462
RSP: 0018:ffff8801c2ecf820  EFLAGS: 00010293
RAX: ffff8801d39297c0 RBX: ffffea0006c8c280 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff81640f40 RDI: ffffea0006c8c290
RBP: ffff8801c2ecf9d8 R08: 0000000000000000 R09: 00000000000225a8
R10: ffffffffffffffe8 R11: 0000000000000000 R12: 0000000000000008
R13: 0000000000000092 R14: dffffc0000000000 R15: ffff8801c2ecfb20
FS:  0000000001cd2940(0063) GS:ffff8801db600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2ee4a000 CR3: 00000001d8c63000 CR4: 00000000001606b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 1ffff100385d9f12 ffff8801c2ecf8b0 ffff8801c2ecfb28 ffff8801c2ecfb30
 00000000c2ecf8f0 0007ffffffffffff ffff8800b86a3ba0 0000000e0000000c
 7fffffffffffff6f ffff8801c2ecf8f0 ffff8801c2ecfb38 ffffed00385d9f65
Call Trace:
 [<ffffffff8165019c>] ext4_writepages+0xd4c/0x2c20 fs/ext4/inode.c:2617
 [<ffffffff813d7f9f>] do_writepages+0xef/0x1d0 mm/page-writeback.c:2334
 [<ffffffff813b9959>] __filemap_fdatawrite_range+0x1a9/0x250 mm/filemap.c:347
 [<ffffffff813b9a53>] __filemap_fdatawrite mm/filemap.c:355 [inline]
 [<ffffffff813b9a53>] filemap_flush+0x23/0x30 mm/filemap.c:380
 [<ffffffff81647838>] ext4_alloc_da_blocks+0x108/0x3c0 fs/ext4/inode.c:2993
 [<ffffffff8162bc9f>] ext4_release_file+0x1ff/0x2e0 fs/ext4/file.c:42
 [<ffffffff81497685>] __fput+0x235/0x6f0 fs/file_table.c:208
 [<ffffffff81497bc5>] ____fput+0x15/0x20 fs/file_table.c:244
 [<ffffffff8112f8bc>] task_work_run+0x21c/0x2d0 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:188
 [<ffffffff81005784>] prepare_exit_to_usermode arch/x86/entry/common.c:221 [inline]
 [<ffffffff81005784>] syscall_return_slowpath+0x254/0x2d0 arch/x86/entry/common.c:286
 [<ffffffff82715ee1>] int_ret_from_sys_call+0x25/0xa3
Code: 48 89 df e8 43 3f d7 ff e9 32 ff ff ff e8 09 63 cc ff 48 89 df e8 d1 58 d7 ff e9 fa fd ff ff e8 f7 62 cc ff 0f 0b e8 f0 62 cc ff <0f> 0b 31 c0 89 85 b0 fe ff ff e8 e1 62 cc ff 8b 85 18 ff ff ff 
RIP  [<ffffffff81640f40>] mpage_prepare_extent_to_map+0x670/0x8e0 fs/ext4/inode.c:2462
 RSP <ffff8801c2ecf820>
---[ end trace 2df311a2aba311dd ]---