kernel BUG in ext4_write_inline_data

Status: upstream: reported C repro on 2023/07/02 21:30
Bug presence: origin:lts
[Documentation on labels]
Reported-by: syzbot+2d1829aea6073b10c7e6@syzkaller.appspotmail.com
First crash: 1203d, last: 1d23h
Cause bisection: failed (error log, bisect log)
  
Fix bisection: failed (error log, bisect log)
  
▶ ▼ Bug presence (2)
Date Name Commit Repro Result
2023/10/10 lts (merge base) b1644a0031cf C [report] kernel BUG in ext4_write_inline_data
2023/10/10 upstream (ToT) 94f6f0550c62 C Didn't crash
▶ ▼ Similar bugs (11)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-4.14 kernel BUG in ext4_write_inline_data ext4 -1 syz, C 4 1341d 1437d 0/1 upstream: reported C repro on 2022/11/04 18:44
upstream kernel BUG at fs/ext4/inline.c:LINE! ext4 -1 syz, C done done 76 1365d 2188d 22/29 fixed on 2023/02/24 13:50
upstream kernel BUG in ext4_write_inline_data ext4 -1 syz, C error 36 819d 1304d 27/29 fixed on 2024/08/22 01:52
upstream kernel BUG in ext4_write_inline_data (4) ext4 -1 syz, C error 13 157d 251d 29/29 fixed on 2026/05/21 07:49
linux-6.1 kernel BUG in ext4_write_inline_data origin:upstream -1 syz, C error 13 242d 580d 0/3 upstream: reported C repro on 2025/03/10 13:01
upstream kernel BUG in ext4_write_inline_data (3) ext4 -1 syz, C error 8 284d 393d 29/29 fixed on 2026/01/07 12:29
linux-4.19 kernel BUG in ext4_write_inline_data_end ext4 -1 syz, C error 12 1318d 2065d 0/1 upstream: reported C repro on 2021/02/14 13:39
upstream kernel BUG in ext4_write_inline_data (5) prio:high ext4 -1 syz error error 28 54d 124d 0/29 upstream: reported syz repro on 2026/06/09 08:13
upstream kernel BUG in ext4_write_inline_data (2) ext4 -1 syz, C error 46 475d 689d 29/29 fixed on 2025/07/08 00:33
android-5-10 kernel BUG in ext4_write_inline_data ext4 -1 syz, C error inconclusive 3 1337d 1435d 2/2 fixed on 2023/05/04 14:51
android-54 kernel BUG in ext4_write_inline_data -1 syz, C 3 1397d 1435d 2/2 fixed on 2023/04/05 17:17
▶ ▼ Last patch testing requests (9)
Created Duration User Patch Repo Result
2026/10/09 23:37 13m retest repro android14-6.1 report job log log
2026/10/09 23:37 13m retest repro android14-6.1 report job log log
2026/10/09 23:37 11m retest repro android14-6.1 report job log log
2026/10/09 23:37 33m retest repro android14-6.1 no crash job log log
2026/10/09 23:37 16m retest repro android14-6.1 report job log log
2026/07/05 07:13 38m retest repro android14-6.1 log
2026/06/29 15:13 40m retest repro android14-6.1 log
2026/06/29 15:13 21m retest repro android14-6.1 log
2026/06/29 15:13 54m retest repro android14-6.1 log
▶ ▼ Fix bisection attempts (4)
Created Duration User Patch Repo Result
2025/12/12 09:59 4m bisect fix android14-6.1 error job log
2024/02/23 15:19 1h16m bisect fix android14-6.1 OK (0) job log log
2023/12/08 17:40 1h39m bisect fix android14-6.1 OK (0) job log log
2023/10/09 23:56 1h27m bisect fix android14-6.1 OK (0) job log log

Sample crash report:
------------[ cut here ]------------
kernel BUG at fs/ext4/inline.c:226!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 4632 Comm: syz-executor420 Not tainted 6.1.25-syzkaller-00011-gd7dacaa439c7 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2023
RIP: 0010:ext4_write_inline_data+0x3a4/0x3b0 fs/ext4/inline.c:226
Code: 07 fe c1 38 c1 0f 8c 42 ff ff ff 4c 89 e7 49 89 d6 e8 e0 10 cb ff 4c 89 f2 e9 2f ff ff ff e8 f3 d6 84 ff 0f 0b e8 ec d6 84 ff <0f> 0b 66 2e 0f 1f 84 00 00 00 00 00 55 48 89 e5 41 57 41 56 41 55
RSP: 0018:ffffc90007867108 EFLAGS: 00010293
RAX: ffffffff81f017a4 RBX: 000000000000003c RCX: ffff88811a563cc0
RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000001000
RBP: ffffc90007867170 R08: ffffffff81f0152d R09: ffffed1024189c4b
R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000007
R13: ffffc90007867200 R14: 0000000000001000 R15: 0000000000000ff9
FS:  00007fd256de46c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000140 CR3: 000000011024d000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 ext4_write_inline_data_end+0x328/0xa90 fs/ext4/inline.c:767
 ext4_da_write_end+0x1ed/0x970 fs/ext4/inode.c:3079
 generic_perform_write+0x3e6/0x5c0 mm/filemap.c:3776
 ext4_buffered_write_iter+0x360/0x640 fs/ext4/file.c:285
 ext4_file_write_iter+0x194/0x1cf0
 do_iter_write+0x6e6/0xc50 fs/read_write.c:861
 vfs_iter_write+0x7c/0xa0 fs/read_write.c:902
 iter_file_splice_write+0x7f8/0xf90 fs/splice.c:686
 do_splice_from fs/splice.c:764 [inline]
 direct_splice_actor+0xff/0x130 fs/splice.c:931
 splice_direct_to_actor+0x4b4/0xbb0 fs/splice.c:886
 do_splice_direct+0x27f/0x3c0 fs/splice.c:974
 do_sendfile+0x616/0xfe0 fs/read_write.c:1255
 __do_sys_sendfile64 fs/read_write.c:1323 [inline]
 __se_sys_sendfile64 fs/read_write.c:1309 [inline]
 __x64_sys_sendfile64+0x1ce/0x230 fs/read_write.c:1309
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fd256e2ff79
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 91 1b 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fd256de4168 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007fd256eb16c8 RCX: 00007fd256e2ff79
RDX: 0000000000000000 RSI: 0000000000000005 RDI: 0000000000000004
RBP: 00007fd256eb16c0 R08: 00007fd256de46c0 R09: 0000000000000000
R10: 0001000000201005 R11: 0000000000000246 R12: 00007fd256eb16cc
R13: 0000000000000006 R14: 00007ffe14edea50 R15: 00007ffe14edeb38
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:ext4_write_inline_data+0x3a4/0x3b0 fs/ext4/inline.c:226
Code: 07 fe c1 38 c1 0f 8c 42 ff ff ff 4c 89 e7 49 89 d6 e8 e0 10 cb ff 4c 89 f2 e9 2f ff ff ff e8 f3 d6 84 ff 0f 0b e8 ec d6 84 ff <0f> 0b 66 2e 0f 1f 84 00 00 00 00 00 55 48 89 e5 41 57 41 56 41 55
RSP: 0018:ffffc90007867108 EFLAGS: 00010293
RAX: ffffffff81f017a4 RBX: 000000000000003c RCX: ffff88811a563cc0
RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000001000
RBP: ffffc90007867170 R08: ffffffff81f0152d R09: ffffed1024189c4b
R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000007
R13: ffffc90007867200 R14: 0000000000001000 R15: 0000000000000ff9
FS:  00007fd256de46c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000140 CR3: 000000011024d000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

Crashes (33):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/08/13 09:31 android14-6.1 d7dacaa439c7 39990d51 .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-android-6-1 kernel BUG in ext4_write_inline_data
2023/07/02 21:22 android14-6.1 ed2a228522b9 bfc47836 .config strace log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-android-6-1 kernel BUG in ext4_write_inline_data
2026/05/10 21:45 android14-6.1 2f67b6088692 29233ece .config console log report syz / log [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-android-6-1 kernel BUG in ext4_write_inline_data
2026/03/24 21:01 android14-6.1 c0665c721df9 74e70d19 .config console log report syz / log [disk image] [vmlinux] [kernel image] [mounted in repro (clean fs)] ci2-android-6-1 kernel BUG in ext4_write_inline_data
2024/04/24 13:44 android14-6.1 d0c6724b0f6f 21339d7b .config console log report syz [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-android-6-1 kernel BUG in ext4_write_inline_data
2024/01/03 17:41 android14-6.1 2c085909e7a7 fb427a07 .config console log report syz [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-android-6-1 kernel BUG in ext4_write_inline_data
2026/07/30 02:52 android14-6.1 92668decd5e0 6ef5c1e2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in ext4_write_inline_data
2026/05/03 13:20 android14-6.1 1e4e23ff0f90 a0d91488 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in ext4_write_inline_data
2026/04/26 13:59 android14-6.1 5d4307594b33 9c2d0995 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in ext4_write_inline_data
2026/03/05 14:52 android14-6.1 6bfa51973214 d20b04c8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in ext4_write_inline_data
2026/02/06 23:02 android14-6.1 c9e2710a7bd0 97745f52 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in ext4_write_inline_data
2025/07/11 11:47 android14-6.1 e2deb0b42a3a 3cda49cf .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_write_inline_data
2025/06/02 06:01 android14-6.1 db710ea87c32 3d2f584d .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_write_inline_data
2025/05/18 07:36 android14-6.1 a0fa2316cce1 f41472b0 .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_write_inline_data
2025/03/21 00:34 android14-6.1 da6a42c111c8 62330552 .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_write_inline_data
2025/02/28 18:01 android14-6.1 fa3cc11118de 67cf5345 .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_write_inline_data
2025/01/28 05:38 android14-6.1 11620ab958c2 18070896 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-android-6-1 kernel BUG in ext4_write_inline_data
2024/11/17 13:37 android14-6.1 defe0024cfb0 cfe3a04a .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in ext4_write_inline_data
2024/11/17 02:31 android14-6.1 defe0024cfb0 cfe3a04a .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in ext4_write_inline_data
2024/11/07 05:11 android14-6.1 976b055754d7 df3dc63b .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-android-6-1 kernel BUG in ext4_write_inline_data
2024/09/11 12:48 android14-6.1 d02968a02321 8ab55d0e .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-android-6-1 kernel BUG in ext4_write_inline_data
2024/09/11 12:32 android14-6.1 d02968a02321 8ab55d0e .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in ext4_write_inline_data
2024/09/11 12:32 android14-6.1 d02968a02321 8ab55d0e .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in ext4_write_inline_data
2024/05/16 11:02 android14-6.1 274e3e96961d ef5d53ed .config strace log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-android-6-1 kernel BUG in ext4_write_inline_data
2024/04/14 15:58 android14-6.1 b76ed1185975 c8349e48 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in ext4_write_inline_data
2024/04/08 08:40 android14-6.1 60534eef4739 ca620dd8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in ext4_write_inline_data
2024/03/02 12:29 android14-6.1 09ca5740fbbe 25905f5d .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-android-6-1 kernel BUG in ext4_write_inline_data
2024/01/18 14:21 android14-6.1 899194d7e909 239abf84 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in ext4_write_inline_data
2024/01/03 15:21 android14-6.1 2c085909e7a7 fb427a07 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in ext4_write_inline_data
2023/10/25 00:01 android14-6.1 cd4ea97d2adf 17e6d526 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in ext4_write_inline_data
2023/09/07 15:05 android14-6.1 84131c988b4a 72324844 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in ext4_write_inline_data
2023/08/07 22:31 android14-6.1 3926cc6ef8cc b1b6ae3d .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in ext4_write_inline_data
2023/06/26 07:29 android14-6.1 fa9645687ea5 79782afc .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 kernel BUG in ext4_write_inline_data
* Struck through repros no longer work on HEAD.