syzbot


kernel BUG in ext4_write_inline_data (5)

Status: upstream: reported syz repro on 2026/06/09 08:13
Subsystems: ext4
Labels: prio:high
[Documentation on labels]
Reported-by: syzbot+53c8bd6136cfbe85197e@syzkaller.appspotmail.com
First crash: 46d, last: 1d14h
Cause bisection: failed (error log, bisect log)
  
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ID Workflow Result Correct Bug Created Started Finished Revision Error
a82c38f3-aadb-49f7-b23a-f481967861cf assessment-security DenialOfService: ✅ Exploitable: ❌ FilesystemTrigger: ✅ NetworkTrigger: ❌ PeripheralTrigger: ❌ RemoteTrigger: ❌ Unprivileged: ✅ UserNamespace: ❌ VMGuestTrigger: ❌ VMHostTrigger: ❌ kernel BUG in ext4_write_inline_data (5) 2026/06/09 13:21 2026/06/09 13:21 2026/06/09 14:16 c36c07f6c1f2230a36374cbd22235f635e8f9284

			
		
Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [ext4?] kernel BUG in ext4_write_inline_data (5) 0 (2) 2026/07/11 01:29
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 C 4 1259d 1355d 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 1283d 2106d 22/29 fixed on 2023/02/24 13:50
upstream kernel BUG in ext4_write_inline_data ext4 -1 C error 36 737d 1222d 27/29 fixed on 2024/08/22 01:52
upstream kernel BUG in ext4_write_inline_data (4) ext4 -1 C error 13 75d 169d 29/29 fixed on 2026/05/21 07:49
linux-6.1 kernel BUG in ext4_write_inline_data origin:upstream -1 C error 13 160d 498d 0/3 upstream: reported C repro on 2025/03/10 13:01
android-6-1 kernel BUG in ext4_write_inline_data origin:lts -1 C error error 32 72d 1115d 0/2 upstream: reported C repro on 2023/07/02 21:30
upstream kernel BUG in ext4_write_inline_data (3) ext4 -1 C error 8 202d 311d 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 1236d 1983d 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 393d 607d 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 1255d 1353d 2/2 fixed on 2023/05/04 14:51
android-54 kernel BUG in ext4_write_inline_data -1 C 3 1315d 1353d 2/2 fixed on 2023/04/05 17:17

Sample crash report:
------------[ cut here ]------------
kernel BUG at fs/ext4/inline.c:240!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 1 UID: 0 PID: 6277 Comm: syz.5.64 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:ext4_write_inline_data+0x40b/0x4f0 fs/ext4/inline.c:240
Code: fe e8 e9 e7 36 ff 42 8d 44 23 c4 bb 3c 00 00 00 89 44 24 08 44 29 e3 e9 aa fe ff ff e8 ce e7 36 ff 90 0f 0b e8 c6 e7 36 ff 90 <0f> 0b e8 be e7 36 ff 48 8d 3d f7 52 56 0e 48 c7 c2 e0 95 ed 8b 4c
RSP: 0018:ffffc90003d7f8e0 EFLAGS: 00010293
RAX: 0000000000000000 RBX: 0000000000000078 RCX: ffffffff82d2c53b
RDX: ffff8880280cdd00 RSI: ffffffff82d2c75a RDI: ffff8880280cdd00
RBP: ffff88807127e000 R08: 0000000000000006 R09: 0000000000000080
R10: 000000000000003c R11: 0000000000000000 R12: 0000000000000008
R13: 0000000000000080 R14: ffffc90003d7f980 R15: ffff88807127e58a
FS:  00007f45fb4396c0(0000) GS:ffff888123eed000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ff59e5b7000 CR3: 000000007855a000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 ext4_write_inline_data_end+0x2a8/0xdb0 fs/ext4/inline.c:825
 ext4_da_write_end+0x51e/0xe70 fs/ext4/inode.c:3305
 generic_perform_write+0x513/0xa40 mm/filemap.c:4379
 ext4_buffered_write_iter+0xdc/0x3b0 fs/ext4/file.c:316
 ext4_file_write_iter+0xa2f/0x1cb0 fs/ext4/file.c:735
 new_sync_write fs/read_write.c:595 [inline]
 vfs_write+0x6ac/0x1050 fs/read_write.c:687
 ksys_write+0x12a/0x250 fs/read_write.c:739
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f45fa59de59
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f45fb439028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f45fa825fa0 RCX: 00007f45fa59de59
RDX: 0000000000000078 RSI: 00002000000000c0 RDI: 0000000000000004
RBP: 00007f45fa633e6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f45fa826038 R14: 00007f45fa825fa0 R15: 00007fff8e2c70e8
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:ext4_write_inline_data+0x40b/0x4f0 fs/ext4/inline.c:240
Code: fe e8 e9 e7 36 ff 42 8d 44 23 c4 bb 3c 00 00 00 89 44 24 08 44 29 e3 e9 aa fe ff ff e8 ce e7 36 ff 90 0f 0b e8 c6 e7 36 ff 90 <0f> 0b e8 be e7 36 ff 48 8d 3d f7 52 56 0e 48 c7 c2 e0 95 ed 8b 4c
RSP: 0018:ffffc90003d7f8e0 EFLAGS: 00010293
RAX: 0000000000000000 RBX: 0000000000000078 RCX: ffffffff82d2c53b
RDX: ffff8880280cdd00 RSI: ffffffff82d2c75a RDI: ffff8880280cdd00
RBP: ffff88807127e000 R08: 0000000000000006 R09: 0000000000000080
R10: 000000000000003c R11: 0000000000000000 R12: 0000000000000008
R13: 0000000000000080 R14: ffffc90003d7f980 R15: ffff88807127e58a
FS:  00007f45fb4396c0(0000) GS:ffff888123ded000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ff59e5b6000 CR3: 000000007855a000 CR4: 0000000000350ef0

Crashes (5):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/07/11 01:28 upstream a635d6748234 99e64375 .config console log report syz / log [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci-upstream-kasan-badwrites-root kernel BUG in ext4_write_inline_data
2026/07/02 13:28 upstream 4a50a141f05a 27192279 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs kernel BUG in ext4_write_inline_data
2026/06/09 14:59 upstream 2d3090a8aeb5 c36c07f6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs kernel BUG in ext4_write_inline_data
2026/06/05 08:09 upstream 9154c4af7829 197909be .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs kernel BUG in ext4_write_inline_data
2026/07/20 07:23 linux-next cc2b5f627e8c 72524a66 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root kernel BUG in ext4_write_inline_data
* Struck through repros no longer work on HEAD.