------------[ cut here ]------------
kernel BUG at fs/ext4/inode.c:2732!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 2630 Comm: kworker/u4:43 Tainted: G        W         5.4.161-syzkaller-00052-g57f9b292a6a3 #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+0xa8f/0xaa0 fs/ext4/inode.c:2732
Code: 4c 89 f7 e8 d3 06 d1 ff e9 4e f7 ff ff 0f 8f e7 fe ff ff 48 8d bc 24 98 00 00 00 e8 bb 06 d1 ff e9 d5 fe ff ff e8 a1 ea a3 ff <0f> 0b e8 9a ea a3 ff 0f 0b e8 73 8f 7d ff 0f 1f 00 55 41 57 41 56
RSP: 0018:ffff8881be1073e0 EFLAGS: 00010293
RAX: ffffffff81bcbbbf RBX: 0000000000000001 RCX: ffff8881ed7d5e80
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffffffff81bcb8ac R09: fffff94000d854d1
R10: fffff94000d854d1 R11: 0000000000000000 R12: ffffea0006c2a680
R13: dffffc0000000000 R14: ffff8881be1076c0 R15: ffff8881be1076d0
FS:  0000000000000000(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000002005f000 CR3: 00000001e20f9000 CR4: 00000000003406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 ext4_writepages+0xd5e/0x3cd0 fs/ext4/inode.c:2861
 do_writepages+0xda/0x1f0 mm/page-writeback.c:2344
 __writeback_single_inode+0xc4/0x830 fs/fs-writeback.c:1467
 writeback_sb_inodes+0x9a8/0x1b70 fs/fs-writeback.c:1729
 wb_writeback+0x3b0/0xbe0 fs/fs-writeback.c:1902
 wb_do_writeback+0x19f/0xa90 fs/fs-writeback.c:2047
 wb_workfn+0x118/0x960 fs/fs-writeback.c:2088
 process_one_work+0x679/0x1030 kernel/workqueue.c:2278
 worker_thread+0xa6f/0x1400 kernel/workqueue.c:2424
 kthread+0x30f/0x330 kernel/kthread.c:288
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:352
Modules linked in:
---[ end trace 30304811c48eeb53 ]---
RIP: 0010:mpage_prepare_extent_to_map+0xa8f/0xaa0 fs/ext4/inode.c:2732
Code: 4c 89 f7 e8 d3 06 d1 ff e9 4e f7 ff ff 0f 8f e7 fe ff ff 48 8d bc 24 98 00 00 00 e8 bb 06 d1 ff e9 d5 fe ff ff e8 a1 ea a3 ff <0f> 0b e8 9a ea a3 ff 0f 0b e8 73 8f 7d ff 0f 1f 00 55 41 57 41 56
RSP: 0018:ffff8881be1073e0 EFLAGS: 00010293
RAX: ffffffff81bcbbbf RBX: 0000000000000001 RCX: ffff8881ed7d5e80
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffffffff81bcb8ac R09: fffff94000d854d1
R10: fffff94000d854d1 R11: 0000000000000000 R12: ffffea0006c2a680
R13: dffffc0000000000 R14: ffff8881be1076c0 R15: ffff8881be1076d0
FS:  0000000000000000(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020d69030 CR3: 00000001dd123000 CR4: 00000000003406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400