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kernel BUG at fs/ext4/inode.c:2462!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
Modules linked in:
CPU: 1 PID: 11475 Comm: syz-executor1 Not tainted 4.4.163+ #121
task: ffff8801d3934740 task.stack: ffff8800b4288000
RIP: 0010:[<ffffffff81640120>]  [<ffffffff81640120>] mpage_prepare_extent_to_map+0x670/0x8e0 fs/ext4/inode.c:2462
RSP: 0018:ffff8800b428f5a0  EFLAGS: 00010216
RAX: 0000000000040000 RBX: ffffea0006ef7fc0 RCX: ffffc9000356f000
RDX: 0000000000039643 RSI: ffffffff81640120 RDI: ffffea0006ef7fd0
RBP: ffff8800b428f758 R08: ffff8801d3935008 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000
R13: 000000000000001e R14: dffffc0000000000 R15: ffff8800b428f8a0
FS:  00007fbd08430700(0000) GS:ffff8801db700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b30739000 CR3: 00000001cfca5000 CR4: 00000000001606b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 1ffff10016851ec2 ffff8800b428f630 ffff8800b428f8a8 ffff8800b428f8b0
 0000000081a38520 0007ffffffffffff ffff8801ce81e378 0000000e0000000c
 7fffffffffffffef ffff8800b428f670 ffff8800b428f8b8 ffffed0016851f15
Call Trace:
 [<ffffffff8164f37c>] ext4_writepages+0xd4c/0x2c20 fs/ext4/inode.c:2617
 [<ffffffff813d76ff>] do_writepages+0xef/0x1d0 mm/page-writeback.c:2334
 [<ffffffff813b90b9>] __filemap_fdatawrite_range+0x1a9/0x250 mm/filemap.c:347
 [<ffffffff813b91b3>] __filemap_fdatawrite mm/filemap.c:355 [inline]
 [<ffffffff813b91b3>] filemap_flush+0x23/0x30 mm/filemap.c:380
 [<ffffffff81646a18>] ext4_alloc_da_blocks+0x108/0x3c0 fs/ext4/inode.c:2993
 [<ffffffff8162ae7f>] ext4_release_file+0x1ff/0x2e0 fs/ext4/file.c:42
 [<ffffffff81496e35>] __fput+0x235/0x6f0 fs/file_table.c:208
 [<ffffffff81497375>] ____fput+0x15/0x20 fs/file_table.c:244
 [<ffffffff8112f23f>] task_work_run+0x10f/0x190 kernel/task_work.c:115
 [<ffffffff81101ab2>] get_signal+0x1182/0x14a0 kernel/signal.c:2151
 [<ffffffff8100bf65>] do_signal+0x95/0x1840 arch/x86/kernel/signal.c:712
 [<ffffffff81003eba>] exit_to_usermode_loop+0x11a/0x160 arch/x86/entry/common.c:250
 [<ffffffff81005924>] prepare_exit_to_usermode arch/x86/entry/common.c:287 [inline]
 [<ffffffff81005924>] syscall_return_slowpath+0x254/0x2d0 arch/x86/entry/common.c:352
 [<ffffffff8271256d>] int_ret_from_sys_call+0x25/0xa3
Code: 48 89 df e8 c3 44 d7 ff e9 32 ff ff ff e8 79 71 cc ff 48 89 df e8 51 5e d7 ff e9 fa fd ff ff e8 67 71 cc ff 0f 0b e8 60 71 cc ff <0f> 0b 31 c0 89 85 b0 fe ff ff e8 51 71 cc ff 8b 85 18 ff ff ff 
RIP  [<ffffffff81640120>] mpage_prepare_extent_to_map+0x670/0x8e0 fs/ext4/inode.c:2462
 RSP <ffff8800b428f5a0>
---[ end trace a46162cbd28960d1 ]---