------------[ cut here ]------------
kernel BUG at fs/ext4/inode.c:2715!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 25668 Comm: kworker/u4:6 Tainted: G        W         5.4.11-syzkaller-00385-gd32a4878e299 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: writeback wb_workfn (flush-8:0)
RIP: 0010:mpage_prepare_extent_to_map+0xb47/0xb60 fs/ext4/inode.c:2715
Code: e8 8e 8c ce ff e9 fb f6 ff ff 44 89 e1 80 e1 07 38 c1 0f 8c bc fe ff ff 4c 89 e7 e8 73 8c ce ff e9 af fe ff ff e8 39 99 a0 ff <0f> 0b e8 32 99 a0 ff 0f 0b e8 5b af 77 ff 90 66 2e 0f 1f 84 00 00
RSP: 0000:ffff8881996c6e00 EFLAGS: 00010293
RAX: ffffffff81a1f907 RBX: 0000000000000000 RCX: ffff8881d40dc9c0
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffff8881996c6fd0 R08: ffffffff81a1f5ad R09: fffff94000d88011
R10: fffff94000d88011 R11: 0000000000000000 R12: ffffea0006c40080
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881996c72b8
FS:  0000000000000000(0000) GS:ffff8881dba00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffe93214ba0 CR3: 00000001ce450001 CR4: 00000000001606f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace:
 ext4_writepages+0x140d/0x47a0 fs/ext4/inode.c:2844
 do_writepages+0x12e/0x290 mm/page-writeback.c:2344
 __writeback_single_inode+0x1f6/0xbe0 fs/fs-writeback.c:1452
 writeback_sb_inodes+0xa88/0x19c0 fs/fs-writeback.c:1716
 wb_writeback+0x5ed/0xc30 fs/fs-writeback.c:1892
 wb_do_writeback fs/fs-writeback.c:2037 [inline]
 wb_workfn+0x54c/0x13a0 fs/fs-writeback.c:2078
 process_one_work+0x9d8/0x1030 kernel/workqueue.c:2269
 worker_thread+0xbbc/0x1610 kernel/workqueue.c:2415
 kthread+0x31a/0x340 kernel/kthread.c:255
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:352
Modules linked in:
---[ end trace b642cb5ad6b768e3 ]---
RIP: 0010:mpage_prepare_extent_to_map+0xb47/0xb60 fs/ext4/inode.c:2715
Code: e8 8e 8c ce ff e9 fb f6 ff ff 44 89 e1 80 e1 07 38 c1 0f 8c bc fe ff ff 4c 89 e7 e8 73 8c ce ff e9 af fe ff ff e8 39 99 a0 ff <0f> 0b e8 32 99 a0 ff 0f 0b e8 5b af 77 ff 90 66 2e 0f 1f 84 00 00
RSP: 0000:ffff8881996c6e00 EFLAGS: 00010293
RAX: ffffffff81a1f907 RBX: 0000000000000000 RCX: ffff8881d40dc9c0
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffff8881996c6fd0 R08: ffffffff81a1f5ad R09: fffff94000d88011
R10: fffff94000d88011 R11: 0000000000000000 R12: ffffea0006c40080
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881996c72b8
FS:  0000000000000000(0000) GS:ffff8881dbb00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 00000001d565b002 CR4: 00000000001606e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400