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kernel BUG in ext4_writepages

Status: upstream: reported C repro on 2023/06/05 07:33
Bug presence: origin:upstream
[Documentation on labels]
Reported-by: syzbot+0315bf3ff63b77f29a5a@syzkaller.appspotmail.com
First crash: 931d, last: 5h26m
Cause bisection: failed (error log, bisect log)
  
▶ ▼ Bug presence (2)
Date Name Commit Repro Result
2023/08/31 lts (merge base) b1644a0031cf C [report] kernel BUG in ext4_writepages
2023/08/31 upstream (ToT) b97d64c72259 C [report] kernel BUG in ext4_do_writepages
▶ ▼ Similar bugs (9)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-4.19 kernel BUG at fs/ext4/inode.c:LINE! ext4 -1 C error 145 1014d 1888d 0/1 upstream: reported C repro on 2020/10/14 01:19
android-54 kernel BUG at fs/ext4/inode.c:LINE! ext4 -1 C 272 203d 2162d 0/2 upstream: reported C repro on 2020/01/14 12:13
linux-5.15 kernel BUG in ext4_writepages origin:upstream -1 C error 204 1d05h 1008d 0/3 upstream: reported C repro on 2023/03/13 06:22
linux-4.14 kernel BUG at fs/ext4/inode.c:LINE! ext4 -1 C 11 1022d 1816d 0/1 upstream: reported C repro on 2020/12/25 03:51
linux-6.1 kernel BUG in ext4_writepages origin:upstream -1 C 243 18d 1008d 0/3 upstream: reported C repro on 2023/03/12 17:26
android-5-15 kernel BUG in ext4_writepages ext4 origin:upstream -1 C error 532 11d 1154d 0/2 upstream: reported C repro on 2022/10/18 14:12
android-5-10 kernel BUG in ext4_writepages -1 C error 5 1154d 1315d 2/2 fixed on 2022/11/16 18:44
upstream kernel BUG in mpage_prepare_extent_to_map ext4 -1 C done error 145 1098d 1659d 0/29 auto-obsoleted due to no activity on 2024/03/07 20:46
android-5-10 kernel BUG in ext4_writepages (2) ext4 -1 C error inconclusive 386 14h13m 1114d 0/2 upstream: reported C repro on 2022/11/27 00:51
▶ ▼ Last patch testing requests (10)
Created Duration User Patch Repo Result
2025/11/22 21:22 6m retest repro android14-6.1 report log
2025/11/22 21:22 8m retest repro android14-6.1 report log
2025/11/22 21:22 6m retest repro android14-6.1 report log
2025/11/22 21:22 10m retest repro android14-6.1 report log
2025/11/22 21:22 9m retest repro android14-6.1 report log
2025/11/08 15:33 9m retest repro android14-6.1 report log
2025/11/08 15:33 14m retest repro android14-6.1 report log
2025/11/08 15:33 12m retest repro android14-6.1 report log
2025/11/08 15:33 13m retest repro android14-6.1 report log
2025/11/08 15:33 26m retest repro android14-6.1 report log
▶ ▼ Fix bisection attempts (4)
Created Duration User Patch Repo Result
2024/03/26 03:41 41m bisect fix android14-6.1 OK (0) job log log
2024/01/21 21:23 48m bisect fix android14-6.1 OK (0) job log log
2023/11/24 17:54 45m bisect fix android14-6.1 OK (0) job log log
2023/10/25 04:31 46m bisect fix android14-6.1 OK (0) job log log

Sample crash report:
------------[ cut here ]------------
kernel BUG at fs/ext4/inode.c:2761!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 328 Comm: kworker/u4:3 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
Workqueue: writeback wb_workfn (flush-7:4)
RIP: 0010:ext4_writepages+0x2ff8/0x3020 fs/ext4/inode.c:2760
Code: 7a 86 ff 84 db 75 31 e8 a6 77 86 ff 49 bc 00 00 00 00 00 fc ff df 4c 8b 7c 24 18 4c 8b 6c 24 38 e9 a2 f7 ff ff e8 88 77 86 ff <0f> 0b e8 81 77 86 ff e8 b8 c9 16 ff eb 93 e8 75 77 86 ff e8 ac c9
RSP: 0018:ffffc90001717120 EFLAGS: 00010293
RAX: ffffffff81e9b0e8 RBX: 0000008410000000 RCX: ffff88810d6b0000
RDX: 0000000000000000 RSI: 0000008000000000 RDI: 0000000000000000
RBP: ffffc90001717490 R08: dffffc0000000000 R09: ffffed102611a179
R10: ffffed102611a179 R11: 1ffff1102611a178 R12: dffffc0000000000
R13: ffff8881308d0cd8 R14: 0000008000000000 R15: ffff8881308d0bc0
FS:  0000000000000000(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffdf1eb700c CR3: 000000012dc0d000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 do_writepages+0x3a9/0x5e0 mm/page-writeback.c:2494
 __writeback_single_inode+0xc6/0xad0 fs/fs-writeback.c:1622
 writeback_sb_inodes+0x9b8/0x1550 fs/fs-writeback.c:1913
 wb_writeback+0x3f1/0x980 fs/fs-writeback.c:2089
 wb_do_writeback fs/fs-writeback.c:2236 [inline]
 wb_workfn+0x350/0xda0 fs/fs-writeback.c:2276
 process_one_work+0x71f/0xc40 kernel/workqueue.c:2302
 worker_thread+0xa29/0x11f0 kernel/workqueue.c:2449
 kthread+0x281/0x320 kernel/kthread.c:386
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:ext4_writepages+0x2ff8/0x3020 fs/ext4/inode.c:2760
Code: 7a 86 ff 84 db 75 31 e8 a6 77 86 ff 49 bc 00 00 00 00 00 fc ff df 4c 8b 7c 24 18 4c 8b 6c 24 38 e9 a2 f7 ff ff e8 88 77 86 ff <0f> 0b e8 81 77 86 ff e8 b8 c9 16 ff eb 93 e8 75 77 86 ff e8 ac c9
RSP: 0018:ffffc90001717120 EFLAGS: 00010293
RAX: ffffffff81e9b0e8 RBX: 0000008410000000 RCX: ffff88810d6b0000
RDX: 0000000000000000 RSI: 0000008000000000 RDI: 0000000000000000
RBP: ffffc90001717490 R08: dffffc0000000000 R09: ffffed102611a179
R10: ffffed102611a179 R11: 1ffff1102611a178 R12: dffffc0000000000
R13: ffff8881308d0cd8 R14: 0000008000000000 R15: ffff8881308d0bc0
FS:  0000000000000000(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b33b63fff CR3: 000000010ef54000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

Crashes (291):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/11/29 09:09 android14-6.1 a92da54b7708 d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-android-6-1 kernel BUG in ext4_writepages
2025/10/20 10:12 android14-6.1 22c0b7236c43 1c8c8cd8 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-android-6-1 kernel BUG in ext4_writepages
2025/10/20 08:14 android14-6.1 22c0b7236c43 1c8c8cd8 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-android-6-1 kernel BUG in ext4_writepages
2025/10/19 22:43 android14-6.1 22c0b7236c43 1c8c8cd8 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-android-6-1 kernel BUG in ext4_writepages
2025/10/19 18:18 android14-6.1 22c0b7236c43 1c8c8cd8 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-android-6-1 kernel BUG in ext4_writepages
2025/09/20 18:35 android14-6.1 462bdb2cb1b1 67c37560 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-android-6-1 kernel BUG in ext4_writepages
2025/05/31 09:13 android14-6.1 db710ea87c32 3d2f584d .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-android-6-1 kernel BUG in ext4_writepages
2025/05/28 03:45 android14-6.1 db710ea87c32 874a1386 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-android-6-1 kernel BUG in ext4_writepages
2025/03/06 15:51 android14-6.1 471a10d3af3b 831e3629 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-android-6-1 kernel BUG in ext4_writepages
2025/02/13 08:54 android14-6.1 c93dcf3b5358 b27c2402 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-android-6-1 kernel BUG in ext4_writepages
2025/02/12 19:54 android14-6.1 c93dcf3b5358 b27c2402 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-android-6-1 kernel BUG in ext4_writepages
2025/01/26 14:58 android14-6.1 ef4fb40b87a9 9fbd772e .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-android-6-1 kernel BUG in ext4_writepages
2024/12/26 06:47 android14-6.1 4c2d86d81fa6 444551c4 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-android-6-1 kernel BUG in ext4_writepages
2024/08/31 09:52 android14-6.1 b5e374dda921 1eda0d14 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-android-6-1 kernel BUG in ext4_writepages
2024/04/30 14:59 android14-6.1 6364d594125d 3ce4924c .config strace log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-android-6-1 kernel BUG in ext4_writepages
2024/04/30 10:07 android14-6.1 4744b3a4ed72 f10afd69 .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-android-6-1 kernel BUG in ext4_writepages
2024/04/26 00:33 android14-6.1 fa87a072a7fc 8bdc0f22 .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-android-6-1 kernel BUG in ext4_writepages
2024/04/23 04:51 android14-6.1 503add184388 36c961ad .config strace log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-android-6-1 kernel BUG in ext4_writepages
2024/04/21 02:44 android14-6.1 dcb09569bbff af24b050 .config strace log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-android-6-1 kernel BUG in ext4_writepages
2023/08/10 20:05 android14-6.1 b0c06048a8ff da3c3ef8 .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-android-6-1 kernel BUG in ext4_writepages
2023/06/10 16:40 android14-6.1 7641ff0a300a 49519f06 .config strace log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-android-6-1 kernel BUG in ext4_writepages
2023/06/05 07:24 android14-6.1 7b1489746079 a4ae4f42 .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-android-6-1 kernel BUG in ext4_writepages
2025/08/15 16:52 android14-6.1 831a57b4a783 1804e95e .config console log report syz / log [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-android-6-1 kernel BUG in ext4_writepages
2025/06/18 03:19 android14-6.1 ba4506940166 e77fae15 .config console log report syz / log [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-android-6-1 kernel BUG in ext4_writepages
2025/02/09 07:06 android14-6.1 1ac09f5c0571 ef44b750 .config console log report syz / log [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-android-6-1 kernel BUG in ext4_writepages
2025/02/05 22:34 android14-6.1 7658169f5f5f 4dc70884 .config console log report syz / log [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-android-6-1 kernel BUG in ext4_writepages
2025/01/23 14:31 android14-6.1 092a580916f8 a44b0418 .config console log report syz / log [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-android-6-1 kernel BUG in ext4_writepages
2024/05/18 09:10 android14-6.1 51c421385e7a c0f1611a .config console log report syz [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-android-6-1 kernel BUG in ext4_writepages
2024/02/11 02:23 android14-6.1 d3f73f04529a 77b23aa1 .config console log report syz [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-android-6-1 kernel BUG in ext4_writepages
2023/07/09 10:45 android14-6.1 0a2e9dd65c6b 668cb1fa .config strace log report syz [disk image] [vmlinux] [kernel image] [mounted in repro #1] [mounted in repro #2] ci2-android-6-1 kernel BUG in ext4_writepages
2023/07/08 21:05 android14-6.1 0a2e9dd65c6b 668cb1fa .config console log report syz [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-android-6-1 kernel BUG in ext4_writepages
2023/05/28 17:32 android14-6.1 500484f5be02 cf184559 .config console log report syz [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-android-6-1 kernel BUG in ext4_writepages
2025/12/15 09:42 android14-6.1 6f1c2f8fd8c8 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in ext4_writepages
2025/12/11 04:45 android14-6.1 0ac176d7ef4d d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in ext4_writepages
2025/12/11 03:23 android14-6.1 0ac176d7ef4d d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in ext4_writepages
2025/12/09 02:02 android14-6.1 5ddae867b428 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in ext4_writepages
2025/12/07 22:41 android14-6.1 5ddae867b428 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in ext4_writepages
2025/12/07 12:08 android14-6.1 5ddae867b428 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in ext4_writepages
2025/12/07 10:21 android14-6.1 5ddae867b428 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in ext4_writepages
2025/12/06 18:46 android14-6.1 5ddae867b428 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in ext4_writepages
2025/12/05 21:15 android14-6.1 5ddae867b428 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in ext4_writepages
2025/11/30 03:39 android14-6.1 a92da54b7708 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in ext4_writepages
2025/11/29 16:40 android14-6.1 a92da54b7708 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in ext4_writepages
2025/11/28 17:39 android14-6.1 a92da54b7708 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in ext4_writepages
2025/11/24 11:30 android14-6.1 eba111621724 4fb8ef37 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in ext4_writepages
2025/10/25 09:26 android14-6.1 22c0b7236c43 c0460fcd .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in ext4_writepages
2025/09/15 23:54 android14-6.1 77259d2668d7 e2beed91 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in ext4_writepages
2025/09/15 12:14 android14-6.1 876f660de856 e2beed91 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in ext4_writepages
2025/09/14 08:28 android14-6.1 0429b7af308c e2beed91 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in ext4_writepages
2025/09/14 06:55 android14-6.1 0429b7af308c e2beed91 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in ext4_writepages
2025/09/13 23:30 android14-6.1 0429b7af308c e2beed91 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in ext4_writepages
2025/09/13 20:19 android14-6.1 0429b7af308c e2beed91 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in ext4_writepages
2025/09/11 21:37 android14-6.1 0429b7af308c e2beed91 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in ext4_writepages
2025/09/11 16:33 android14-6.1 0429b7af308c fdeaa69b .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in ext4_writepages
2025/09/11 03:10 android14-6.1 0429b7af308c fdeaa69b .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in ext4_writepages
2025/08/25 07:59 android14-6.1 397bc5b3eca0 bf27483f .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in ext4_writepages
2025/08/24 22:57 android14-6.1 397bc5b3eca0 bf27483f .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in ext4_writepages
2025/08/19 00:22 android14-6.1 87b9d836c3d8 1804e95e .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in ext4_writepages
2025/08/14 21:17 android14-6.1 82186ba31010 5d8c2ac2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in ext4_writepages
2025/08/11 14:54 android14-6.1 c750dc582629 32a0e5ed .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in ext4_writepages
2025/08/07 03:57 android14-6.1 39fefc4d6aea 9a42d6b1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in ext4_writepages
2025/08/05 22:21 android14-6.1 39e817cf9025 37880f40 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in ext4_writepages
2025/07/21 10:17 android14-6.1 145c7fad733f 7117feec .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in ext4_writepages
2025/07/14 02:07 android14-6.1 e2deb0b42a3a 3cda49cf .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in ext4_writepages
2025/07/13 06:25 android14-6.1 e2deb0b42a3a 3cda49cf .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in ext4_writepages
2025/06/24 15:28 android14-6.1 45271a2c461a e2f27c35 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in ext4_writepages
2025/06/11 16:21 android14-6.1 47e5d7e91778 5d7e17ca .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in ext4_writepages
2025/06/08 06:06 android14-6.1 7af56ffc913d 4826c28e .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in ext4_writepages
2025/06/08 06:06 android14-6.1 7af56ffc913d 4826c28e .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in ext4_writepages
2025/06/02 04:09 android14-6.1 db710ea87c32 3d2f584d .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in ext4_writepages
2025/06/01 07:27 android14-6.1 db710ea87c32 3d2f584d .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in ext4_writepages
2025/06/01 01:51 android14-6.1 db710ea87c32 3d2f584d .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in ext4_writepages
2025/05/21 10:04 android14-6.1 5b71d364254c b47f9e02 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in ext4_writepages
2025/05/12 12:22 android14-6.1 646380b087a5 77908e5f .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in ext4_writepages
2025/04/14 00:39 android14-6.1 19a0fb1d3513 0bd6db41 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-android-6-1 kernel BUG in ext4_writepages
2025/04/13 23:54 android14-6.1 19a0fb1d3513 0bd6db41 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-android-6-1 kernel BUG in ext4_writepages
2025/04/13 23:07 android14-6.1 19a0fb1d3513 0bd6db41 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-android-6-1 kernel BUG in ext4_writepages
* Struck through repros no longer work on HEAD.