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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: 5799 Comm: syz-executor0 Not tainted 4.4.163+ #121
task: ffff8800b81f8000 task.stack: ffff8801d4778000
RIP: 0010:[<ffffffff81640120>]  [<ffffffff81640120>] mpage_prepare_extent_to_map+0x670/0x8e0 fs/ext4/inode.c:2462
RSP: 0018:ffff8801d477f830  EFLAGS: 00010293
RAX: ffff8800b81f8000 RBX: ffffea000221a100 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff81640120 RDI: ffffea000221a110
RBP: ffff8801d477f9e8 R08: ffff8800b81f88c8 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000
R13: 00000000000000d3 R14: dffffc0000000000 R15: ffff8801d477fb30
FS:  00000000027a9940(0063) GS:ffff8801db600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2ee4d000 CR3: 00000001d57dd000 CR4: 00000000001606b0
Stack:
 1ffff1003a8eff14 ffff8801d477f8c0 ffff8801d477fb38 ffff8801d477fb40
 0000000081a38520 0007ffffffffffff ffff88009fb033a8 0000000d0000000c
 7fffffffffffff2f ffff8801d477f900 ffff8801d477fb48 ffffed003a8eff67
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
 [<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
 [<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 <ffff8801d477f830>
---[ end trace 81f99ae5e31b44cb ]---