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kernel BUG in ext4_writepages

Status: upstream: reported C repro on 2023/03/12 17:26
Bug presence: origin:upstream
[Documentation on labels]
Reported-by: syzbot+a8068dd81edde0186829@syzkaller.appspotmail.com
First crash: 815d, last: 6d01h
▶ ▼ Discussions (1)
Title Replies (including bot) Last reply
Re: [v6.1] kernel BUG in ext4_writepages 8 (8) 2023/08/15 16:44
▶ ▼ Bug presence (1)
Date Name Commit Repro Result
2023/05/06 upstream (ToT) fc4354c6e5c2 C [report] kernel BUG in ext4_do_writepages
▶ ▼ Similar bugs (9)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-4.19 kernel BUG at fs/ext4/inode.c:LINE! ext4 C error 145 821d 1694d 0/1 upstream: reported C repro on 2020/10/14 01:19
android-54 kernel BUG at fs/ext4/inode.c:LINE! ext4 C 272 10d 1968d 0/2 upstream: reported C repro on 2020/01/14 12:13
linux-5.15 kernel BUG in ext4_writepages origin:upstream C error 111 3d03h 814d 0/3 upstream: reported C repro on 2023/03/13 06:22
linux-4.14 kernel BUG at fs/ext4/inode.c:LINE! ext4 C 11 828d 1622d 0/1 upstream: reported C repro on 2020/12/25 03:51
android-5-15 kernel BUG in ext4_writepages ext4 origin:upstream C error 459 8h24m 960d 0/2 upstream: reported C repro on 2022/10/18 14:12
android-5-10 kernel BUG in ext4_writepages C error 5 960d 1122d 2/2 fixed on 2022/11/16 18:44
android-6-1 kernel BUG in ext4_writepages origin:upstream C error 239 2d20h 730d 0/2 upstream: reported C repro on 2023/06/05 07:33
upstream kernel BUG in mpage_prepare_extent_to_map ext4 C done error 145 904d 1465d 0/28 auto-obsoleted due to no activity on 2024/03/07 20:46
android-5-10 kernel BUG in ext4_writepages (2) ext4 C error inconclusive 248 1d00h 921d 0/2 upstream: reported C repro on 2022/11/27 00:51
▶ ▼ Fix bisection attempts (5)
Created Duration User Patch Repo Result
2024/08/22 09:14 1h13m bisect fix linux-6.1.y OK (0) job log log
2024/03/28 13:38 4h12m bisect fix linux-6.1.y OK (0) job log log
2023/11/27 13:11 2h14m bisect fix linux-6.1.y OK (0) job log log
2023/10/26 11:24 2h28m bisect fix linux-6.1.y OK (0) job log log
2023/06/30 23:00 56m bisect fix linux-6.1.y OK (0) job log log

Sample crash report:
------------[ cut here ]------------
kernel BUG at fs/ext4/inode.c:2748!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 46 Comm: kworker/u4:3 Not tainted 6.1.84-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
Workqueue: writeback wb_workfn (flush-7:4)
RIP: 0010:ext4_writepages+0x3dd9/0x3de0 fs/ext4/inode.c:2747
Code: c7 b0 05 2c 8d 4c 89 f2 e8 54 50 28 02 e9 b9 fb ff ff e8 1a af 4f ff 0f 0b e8 13 af 4f ff 0f 0b e8 ec 3f 4f 08 e8 07 af 4f ff <0f> 0b 0f 1f 44 00 00 41 57 41 56 41 55 41 54 53 49 89 f7 49 89 fe
RSP: 0018:ffffc90000b76ea0 EFLAGS: 00010293
RAX: ffffffff823ad7e9 RBX: 0000008000000000 RCX: ffff888017eb3b80
RDX: 0000000000000000 RSI: 0000008000000000 RDI: 0000000000000000
RBP: ffffc90000b77290 R08: ffffffff823aa0a0 R09: ffffed100e7d1dd6
R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000001
R13: ffffc90000b77670 R14: 000000c410000000 R15: ffffc90000b77160
FS:  0000000000000000(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020007f80 CR3: 000000001f29c000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 do_writepages+0x3a2/0x670 mm/page-writeback.c:2469
 __writeback_single_inode+0x15d/0x11e0 fs/fs-writeback.c:1612
 writeback_sb_inodes+0xc2b/0x1b20 fs/fs-writeback.c:1903
 __writeback_inodes_wb+0x114/0x400 fs/fs-writeback.c:1974
 wb_writeback+0x4b1/0xe10 fs/fs-writeback.c:2079
 wb_check_background_flush fs/fs-writeback.c:2145 [inline]
 wb_do_writeback fs/fs-writeback.c:2233 [inline]
 wb_workfn+0xc9e/0x1020 fs/fs-writeback.c:2260
 process_one_work+0x8a9/0x11d0 kernel/workqueue.c:2292
 worker_thread+0xa47/0x1200 kernel/workqueue.c:2439
 kthread+0x28d/0x320 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:307
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:ext4_writepages+0x3dd9/0x3de0 fs/ext4/inode.c:2747
Code: c7 b0 05 2c 8d 4c 89 f2 e8 54 50 28 02 e9 b9 fb ff ff e8 1a af 4f ff 0f 0b e8 13 af 4f ff 0f 0b e8 ec 3f 4f 08 e8 07 af 4f ff <0f> 0b 0f 1f 44 00 00 41 57 41 56 41 55 41 54 53 49 89 f7 49 89 fe
RSP: 0018:ffffc90000b76ea0 EFLAGS: 00010293
RAX: ffffffff823ad7e9 RBX: 0000008000000000 RCX: ffff888017eb3b80
RDX: 0000000000000000 RSI: 0000008000000000 RDI: 0000000000000000
RBP: ffffc90000b77290 R08: ffffffff823aa0a0 R09: ffffed100e7d1dd6
R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000001
R13: ffffc90000b77670 R14: 000000c410000000 R15: ffffc90000b77160
FS:  0000000000000000(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fffdb3719b0 CR3: 000000001f29c000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

Crashes (144):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/04/10 08:31 linux-6.1.y 347385861c50 171ec371 .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-6-1-kasan kernel BUG in ext4_writepages
2024/04/08 09:29 linux-6.1.y 347385861c50 ca620dd8 .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-6-1-kasan kernel BUG in ext4_writepages
2024/03/31 14:01 linux-6.1.y e5cd595e23c1 6baf5069 .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro #1] [mounted in repro #2] ci2-linux-6-1-kasan kernel BUG in ext4_writepages
2023/12/30 02:51 linux-6.1.y 4aa6747d9352 fb427a07 .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-6-1-kasan kernel BUG in ext4_writepages
2023/12/20 00:28 linux-6.1.y ba6f5fb46511 3ad490ea .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-6-1-kasan kernel BUG in ext4_writepages
2023/04/01 10:27 linux-6.1.y 3b29299e5f60 f325deb0 .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-6-1-kasan kernel BUG in ext4_writepages
2025/05/29 18:41 linux-6.1.y da3c5173c55f 3d2f584d .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-linux-6-1-kasan-arm64 kernel BUG in ext4_writepages
2025/05/16 16:46 linux-6.1.y 02b72ccb5f9d cfde8269 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-linux-6-1-kasan-arm64 kernel BUG in ext4_writepages
2025/02/02 21:30 linux-6.1.y 0cbb5f65e52f 568559e4 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-6-1-kasan-arm64 kernel BUG in ext4_writepages
2023/08/18 03:52 linux-6.1.y 6c44e13dc284 74b106b6 .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-6-1-kasan kernel BUG in ext4_writepages
2023/08/07 05:06 linux-6.1.y 52a953d0934b 4ffcc9ef .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-6-1-kasan kernel BUG in ext4_writepages
2023/03/31 14:58 linux-6.1.y 3b29299e5f60 f325deb0 .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-6-1-kasan kernel BUG in ext4_writepages
2023/03/13 06:33 linux-6.1.y 1cc3fcf63192 5205ef30 .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-6-1-kasan-arm64 kernel BUG in ext4_writepages
2023/12/31 18:50 linux-6.1.y 4aa6747d9352 fb427a07 .config console log report syz [disk image] [vmlinux] [kernel image] [mounted in repro #1] [mounted in repro #2] ci2-linux-6-1-kasan kernel BUG in ext4_writepages
2025/05/06 08:28 linux-6.1.y ac7079a42ea5 ae98e6b9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in ext4_writepages
2025/05/02 23:18 linux-6.1.y b6736e03756f b0714e37 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in ext4_writepages
2025/05/01 19:28 linux-6.1.y 535ec20c5027 51b137cd .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in ext4_writepages
2025/05/01 10:04 linux-6.1.y 535ec20c5027 ce7952f4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in ext4_writepages
2025/05/01 07:01 linux-6.1.y 535ec20c5027 ce7952f4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in ext4_writepages
2025/04/29 03:21 linux-6.1.y 535ec20c5027 aeb6ec69 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in ext4_writepages
2025/04/24 18:23 linux-6.1.y 420102835862 9882047a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in ext4_writepages
2025/04/20 23:53 linux-6.1.y 420102835862 2a20f901 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in ext4_writepages
2025/04/15 18:12 linux-6.1.y 420102835862 23b969b7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in ext4_writepages
2025/04/13 04:08 linux-6.1.y 420102835862 0bd6db41 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in ext4_writepages
2025/04/10 03:01 linux-6.1.y 3dfebb87d7eb 988b336c .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in ext4_writepages
2025/04/05 05:59 linux-6.1.y 8e60a714ba3b c53ea9c9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in ext4_writepages
2025/04/04 16:22 linux-6.1.y 8e60a714ba3b 1c4febdb .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in ext4_writepages
2025/04/02 23:00 linux-6.1.y 8e60a714ba3b c799dfdd .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in ext4_writepages
2025/04/02 12:45 linux-6.1.y 8e60a714ba3b c799dfdd .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in ext4_writepages
2025/03/31 21:08 linux-6.1.y 8e60a714ba3b d3999433 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in ext4_writepages
2025/03/29 02:22 linux-6.1.y 8e60a714ba3b 9a1a9e31 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in ext4_writepages
2025/03/26 06:21 linux-6.1.y 344a09659766 89d30d73 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in ext4_writepages
2025/03/23 00:22 linux-6.1.y 344a09659766 c6512ef7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in ext4_writepages
2025/03/22 06:03 linux-6.1.y 344a09659766 c6512ef7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in ext4_writepages
2025/03/01 20:36 linux-6.1.y 3a8358583626 c3901742 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in ext4_writepages
2025/02/28 18:27 linux-6.1.y 3a8358583626 67cf5345 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in ext4_writepages
2025/02/28 12:27 linux-6.1.y 3a8358583626 6a8fcbc4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in ext4_writepages
2025/02/28 10:23 linux-6.1.y 3a8358583626 6a8fcbc4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in ext4_writepages
2025/02/28 03:07 linux-6.1.y 3a8358583626 6a8fcbc4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in ext4_writepages
2025/02/27 23:06 linux-6.1.y 3a8358583626 6a8fcbc4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in ext4_writepages
2025/02/27 18:42 linux-6.1.y 3a8358583626 6a8fcbc4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in ext4_writepages
2025/02/27 13:44 linux-6.1.y 3a8358583626 6a8fcbc4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in ext4_writepages
2025/05/30 00:03 linux-6.1.y da3c5173c55f 3d2f584d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in ext4_writepages
2025/05/17 22:24 linux-6.1.y 02b72ccb5f9d f41472b0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in ext4_writepages
2025/05/16 15:38 linux-6.1.y 02b72ccb5f9d cfde8269 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in ext4_writepages
2025/05/03 18:10 linux-6.1.y b6736e03756f b0714e37 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in ext4_writepages
2025/05/01 23:50 linux-6.1.y 535ec20c5027 51b137cd .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in ext4_writepages
2025/04/30 18:36 linux-6.1.y 535ec20c5027 85a5a23f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in ext4_writepages
2025/04/30 03:26 linux-6.1.y 535ec20c5027 85a5a23f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in ext4_writepages
2025/04/19 22:10 linux-6.1.y 420102835862 2a20f901 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in ext4_writepages
2025/04/19 02:58 linux-6.1.y 420102835862 2a20f901 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in ext4_writepages
2025/04/09 17:03 linux-6.1.y 3dfebb87d7eb 47d015b1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in ext4_writepages
2025/04/03 17:22 linux-6.1.y 8e60a714ba3b 996a9618 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in ext4_writepages
2025/03/11 21:07 linux-6.1.y 6ae7ac5c4251 16256247 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in ext4_writepages
2025/02/12 04:56 linux-6.1.y 0cbb5f65e52f f2baddf5 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in ext4_writepages
2025/02/10 03:13 linux-6.1.y 0cbb5f65e52f ef44b750 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in ext4_writepages
2025/02/09 09:57 linux-6.1.y 0cbb5f65e52f ef44b750 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in ext4_writepages
2025/02/02 20:48 linux-6.1.y 0cbb5f65e52f 568559e4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 kernel BUG in ext4_writepages
2023/03/12 17:25 linux-6.1.y 1cc3fcf63192 5205ef30 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel BUG in ext4_writepages
* Struck through repros no longer work on HEAD.