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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: 958d, last: 1d13h
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 (10)
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 C 4 1095d 1191d 0/1 upstream: reported C repro on 2022/11/04 18:44
upstream kernel BUG at fs/ext4/inline.c:LINE! ext4 -1 C done done 76 1119d 1943d 22/29 fixed on 2023/02/24 13:50
upstream kernel BUG in ext4_write_inline_data ext4 -1 C error 36 573d 1059d 27/29 fixed on 2024/08/22 01:52
upstream kernel BUG in ext4_write_inline_data (4) ext4 -1 syz error 3 6d14h 5d18h 0/29 upstream: reported syz repro on 2026/02/02 18:16
linux-6.1 kernel BUG in ext4_write_inline_data origin:upstream -1 C error 11 227d 334d 0/3 upstream: reported C repro on 2025/03/10 13:01
upstream kernel BUG in ext4_write_inline_data (3) ext4 -1 C error 8 38d 147d 29/29 fixed on 2026/01/07 12:29
linux-4.19 kernel BUG in ext4_write_inline_data_end ext4 -1 C error 12 1073d 1819d 0/1 upstream: reported C repro on 2021/02/14 13:39
upstream kernel BUG in ext4_write_inline_data (2) ext4 -1 C error 46 230d 444d 29/29 fixed on 2025/07/08 00:33
android-5-10 kernel BUG in ext4_write_inline_data ext4 -1 C error inconclusive 3 1092d 1190d 2/2 fixed on 2023/05/04 14:51
android-54 kernel BUG in ext4_write_inline_data -1 C 3 1152d 1190d 2/2 fixed on 2023/04/05 17:17
▶ ▼ Last patch testing requests (7)
Created Duration User Patch Repo Result
2026/01/18 01:23 5m retest repro android14-6.1 report log
2025/12/14 12:44 5m retest repro android14-6.1 report log
2025/12/14 12:44 15m retest repro android14-6.1 report log
2025/11/08 15:03 13m retest repro android14-6.1 report log
2025/10/23 11:20 17m retest repro android14-6.1 report log
2025/10/05 12:21 6m retest repro android14-6.1 report log
2025/10/05 12:21 14m retest repro android14-6.1 report 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:236!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 29540 Comm: syz-executor390 Tainted: G        W          6.1.68-syzkaller-00050-g09ca5740fbbe #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
RIP: 0010:ext4_write_inline_data+0x3a4/0x3b0 fs/ext4/inline.c:236
Code: 07 fe c1 38 c1 0f 8c 42 ff ff ff 4c 89 e7 49 89 d6 e8 f0 ef ca ff 4c 89 f2 e9 2f ff ff ff e8 13 23 84 ff 0f 0b e8 0c 23 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:ffffc90006557128 EFLAGS: 00010293
RAX: ffffffff81f14e04 RBX: 000000000000003c RCX: ffff888111532880
RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000003000
RBP: ffffc90006557190 R08: ffffffff81f14b8d R09: ffffed102376c04b
R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000002000
R13: ffffc90006557220 R14: 0000000000003000 R15: 0000000000001000
FS:  00007fa8133e36c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020f65000 CR3: 000000012184f000 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:777
 ext4_da_write_end+0x1ea/0x9a0 fs/ext4/inode.c:3081
 generic_perform_write+0x3e6/0x5c0 mm/filemap.c:3840
 ext4_buffered_write_iter+0x360/0x640 fs/ext4/file.c:285
 ext4_file_write_iter+0x194/0x1570
 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:51 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fa813469639
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 18 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:00007fa8133e3218 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007fa8134f2728 RCX: 00007fa813469639
RDX: 0000000000000000 RSI: 0000000000000006 RDI: 0000000000000007
RBP: 00007fa8134f2720 R08: 00007fff26970587 R09: 0000000000000000
R10: 080000000000001f R11: 0000000000000246 R12: 00007fa8134beaa8
R13: 00007fa8134be320 R14: 00000000200011c0 R15: 0030656c69662f2e
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:ext4_write_inline_data+0x3a4/0x3b0 fs/ext4/inline.c:236
Code: 07 fe c1 38 c1 0f 8c 42 ff ff ff 4c 89 e7 49 89 d6 e8 f0 ef ca ff 4c 89 f2 e9 2f ff ff ff e8 13 23 84 ff 0f 0b e8 0c 23 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:ffffc90006557128 EFLAGS: 00010293
RAX: ffffffff81f14e04 RBX: 000000000000003c RCX: ffff888111532880
RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000003000
RBP: ffffc90006557190 R08: ffffffff81f14b8d R09: ffffed102376c04b
R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000002000
R13: ffffc90006557220 R14: 0000000000003000 R15: 0000000000001000
FS:  00007fa8133e36c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020f65000 CR3: 000000012184f000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

Crashes (27):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
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
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
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
2026/02/06 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
2024/01/18 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.