kernel BUG at fs/ext4/page-io.c:LINE!

kernel BUG at fs/ext4/page-io.c:LINE!
Status: upstream: reported on 2020/08/26 22:38
Reported-by: syzbot+9e6957d9489b099e95bf@syzkaller.appspotmail.com
First crash: 37d, last: 10d

Sample crash report:

------------[ cut here ]------------
kernel BUG at fs/ext4/page-io.c:126!
invalid opcode: 0000 [#2] PREEMPT SMP KASAN
CPU: 0 PID: 15934 Comm: kworker/u16:3 Tainted: G      D           5.9.0-rc5-syzkaller #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014
Workqueue: ext4-rsv-conversion ext4_end_io_rsv_work
RIP: 0010:ext4_finish_bio+0x6a0/0x820 fs/ext4/page-io.c:126
Code: 10 4c 8b 60 28 48 89 44 24 50 e9 2b fb ff ff e8 26 0b 67 ff 48 c7 c6 e0 13 7e 88 4c 89 e7 e8 77 01 96 ff 0f 0b e8 10 0b 67 ff <0f> 0b e8 09 0b 67 ff 48 c7 c6 e0 12 7e 88 4c 89 e7 e8 5a 01 96 ff
RSP: 0018:ffffc9000100fb38 EFLAGS: 00010293
RAX: 0000000000000000 RBX: 0000000000001000 RCX: ffffffff820f31d6
RDX: ffff88805dbf1780 RSI: ffffffff820f34b0 RDI: 0000000000000001
RBP: 0000000000000000 R08: 0000000000000000 R09: ffff88801bafc48f
R10: 0000000000000000 R11: 0000000000000000 R12: ffff88801bafc488
R13: 0000000000000000 R14: dffffc0000000000 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff88802ce00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000758000 CR3: 000000006268b000 CR4: 0000000000350ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 ext4_release_io_end+0x118/0x3b0 fs/ext4/page-io.c:161
 ext4_end_io_end fs/ext4/page-io.c:195 [inline]
 ext4_do_flush_completed_IO fs/ext4/page-io.c:260 [inline]
 ext4_end_io_rsv_work+0x152/0x660 fs/ext4/page-io.c:274
 process_one_work+0x94c/0x1670 kernel/workqueue.c:2269
 worker_thread+0x64c/0x1120 kernel/workqueue.c:2415
 kthread+0x3b5/0x4a0 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294
Modules linked in:
---[ end trace b8e12d59da562217 ]---
RIP: 0010:clear_inode+0x19e/0x1e0 fs/inode.c:536
Code: 5c c3 e8 e5 7d ad ff 0f 0b e8 de 7d ad ff 0f 0b e8 d7 7d ad ff 0f 0b e8 d0 7d ad ff 0f 0b e8 c9 7d ad ff 0f 0b e8 c2 7d ad ff <0f> 0b e8 bb 45 ee ff e9 93 fe ff ff e8 b1 45 ee ff e9 4a ff ff ff
RSP: 0018:ffffc900011e7b70 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff88802515b4f8 RCX: ffffffff81c8c18d
RDX: ffff888064a0ca80 RSI: ffffffff81c8c1fe RDI: 0000000000000007
RBP: ffff88802515b6d0 R08: 0000000000000001 R09: ffffffff8ce2da9f
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000020
R13: 00000000000040a3 R14: 0000000000000000 R15: ffff888072f5c400
FS:  0000000000000000(0000) GS:ffff88802cf00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f80a5bbb550 CR3: 0000000064a64000 CR4: 0000000000350ee0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

Crashes (2):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Maintainers
ci-qemu-upstream	2020/09/18 19:15	upstream	10b82d51	53ce8104	.config	log	report			info	adilger.kernel@dilger.ca, linux-ext4@vger.kernel.org, linux-kernel@vger.kernel.org, tytso@mit.edu
ci-upstream-bpf-kasan-gce	2020/08/22 22:35	bpf	4af7b32f	1da71ab0	.config	log	report				adilger.kernel@dilger.ca, linux-ext4@vger.kernel.org, linux-kernel@vger.kernel.org, tytso@mit.edu