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UBSAN: array-index-out-of-bounds in dtDelete

Status: upstream: reported C repro on 2025/03/18 19:54
Subsystems: jfs
[Documentation on labels]
Reported-by: syzbot+4f9c823a6f63d87491ba@syzkaller.appspotmail.com
First crash: 463d, last: 96d
▶ ▼ ✨ AI Jobs (5)
ID Workflow Result Correct Bug Created Started Finished Revision Error
af7107df-d482-4d80-9cad-7ef06998c57a assessment-security 💥 UBSAN: array-index-out-of-bounds in dtDelete 2026/06/18 03:07 2026/06/18 03:07 2026/06/18 03:36 b62b3ded1759f79b37600c5ffe2b0a81b919b0b0 
failed to run ["make" "KERNELVERSION=syzkaller" "KERNELRELEASE=syzkaller" "LOCALVERSION=-syzkaller" "-j" "32" "ARCH=x86_64" "CC=ccache clang" "LD=ld.lld" "O=/app/workdir/cache/build/c10762ce8b6c6b8843...
truncated to first 200 bytes; open job for full error
bb71c57d-2c7e-4fd9-992f-bc6ef919a78e assessment-security 💥 UBSAN: array-index-out-of-bounds in dtDelete 2026/06/09 23:19 2026/06/09 23:19 2026/06/09 23:47 c36c07f6c1f2230a36374cbd22235f635e8f9284 
failed to run ["make" "KERNELVERSION=syzkaller" "KERNELRELEASE=syzkaller" "LOCALVERSION=-syzkaller" "-j" "32" "ARCH=x86_64" "CC=ccache clang" "LD=ld.lld" "O=/app/workdir/cache/build/c10762ce8b6c6b8843...
truncated to first 200 bytes; open job for full error
a456529c-e797-4551-8fdb-f7cc9005414d assessment-security 💥 UBSAN: array-index-out-of-bounds in dtDelete 2026/06/04 01:05 2026/06/04 01:05 2026/06/04 01:25 62fe15281f5011cd203d8845b8767b10e7443aa5 
failed to run ["make" "KERNELVERSION=syzkaller" "KERNELRELEASE=syzkaller" "LOCALVERSION=-syzkaller" "-j" "32" "ARCH=x86_64" "CC=ccache clang" "LD=ld.lld" "O=/app/workdir/cache/build/c10762ce8b6c6b8843...
truncated to first 200 bytes; open job for full error
5c9073d6-d8ef-42fe-8775-00868c97e7ef assessment-security 💥 UBSAN: array-index-out-of-bounds in dtDelete 2026/06/01 08:23 2026/06/01 08:23 2026/06/01 08:57 6b4a844333e83556da95d61d7f207e7ef5cd4bc6 
failed to run ["make" "KERNELVERSION=syzkaller" "KERNELRELEASE=syzkaller" "LOCALVERSION=-syzkaller" "-j" "32" "ARCH=x86_64" "CC=ccache clang" "LD=ld.lld" "O=/app/workdir/cache/build/c10762ce8b6c6b8843...
truncated to first 200 bytes; open job for full error
07139ebd-2ec3-450d-b55f-ee4011de0961 assessment-security 💥 UBSAN: array-index-out-of-bounds in dtDelete 2026/05/15 10:47 2026/05/15 10:47 2026/05/15 10:48 9cd3beaadf14b3a22d15fd97a0bf081ee41ebe01 
failed to run ["git" "pull" "origin" "HEAD" "--depth=1" "--allow-unrelated-histories"]: exit status 1
fatal: write error: No space left on device
fatal: fetch-pack: invalid index-pack output
▶ ▼ Discussions (4)
Title Replies (including bot) Last reply
[PATCH] jfs: Add check for array bounds in dtDelete 1 (1) 2025/09/19 22:50
[syzbot] [jfs?] UBSAN: array-index-out-of-bounds in dtDelete 0 (3) 2025/09/19 15:23
[PATCH] jfs: Add check for array bounds in dtDelete 1 (2) 2025/09/18 21:27
Re: [syzbot] [jfs?] UBSAN: array-index-out-of-bounds in dtDelete 1 (2) 2025/03/19 02:43
▶ ▼ Last patch testing requests (11)
Created Duration User Patch Repo Result
2026/05/26 00:51 23m retest repro upstream log
2026/03/16 23:51 19m retest repro upstream report log
2026/01/05 23:21 14m retest repro upstream report log
2025/10/27 22:44 8m retest repro upstream report log
2025/09/19 15:23 20m pedrodemargomes@gmail.com patch upstream OK log
2025/09/18 21:11 14m pedrodemargomes@gmail.com patch upstream report log
2025/08/18 22:25 15m retest repro upstream report log
2025/06/09 21:58 17m retest repro upstream report log
2025/04/18 03:25 21m richard120310@gmail.com patch git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git e3a854b577cb report log
2025/03/28 21:57 16m retest repro upstream report log
2025/03/19 02:26 16m leo.fthirata@gmail.com patch upstream report log

Sample crash report:
loop0: detected capacity change from 0 to 32768
------------[ cut here ]------------
UBSAN: array-index-out-of-bounds in fs/jfs/jfs_dtree.c:2132:32
index 240 is out of range for type 'struct dtslot[128]'
CPU: 0 UID: 0 PID: 5303 Comm: syz-executor483 Not tainted 6.14.0-rc6-syzkaller-00115-ge3a854b577cb #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
 ubsan_epilogue lib/ubsan.c:231 [inline]
 __ubsan_handle_out_of_bounds+0x121/0x150 lib/ubsan.c:429
 dtDelete+0x2d67/0x2db0 fs/jfs/jfs_dtree.c:2132
 jfs_rename+0xf91/0x1bf0 fs/jfs/namei.c:1239
 vfs_rename+0xbdb/0xf00 fs/namei.c:5069
 do_renameat2+0xd94/0x13f0 fs/namei.c:5226
 __do_sys_rename fs/namei.c:5273 [inline]
 __se_sys_rename fs/namei.c:5271 [inline]
 __x64_sys_rename+0x82/0x90 fs/namei.c:5271
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc873bc9bb9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 61 17 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fff24dc46e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000052
RAX: ffffffffffffffda RBX: 0000400000000e00 RCX: 00007fc873bc9bb9
RDX: 00007fc873bc9bb9 RSI: 0000400000000f40 RDI: 0000400000000300
RBP: 00007fc873c42610 R08: 00007fff24dc48b8 R09: 00007fff24dc48b8
R10: 00007fff24dc48b8 R11: 0000000000000246 R12: 0000000000000001
R13: 00007fff24dc48a8 R14: 0000000000000001 R15: 0000000000000001
 </TASK>
---[ end trace ]---

Crashes (5):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/03/14 21:42 upstream e3a854b577cb e2826670 .config console log report syz / log C [disk image (non-bootable)] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci-snapshot-upstream-root UBSAN: array-index-out-of-bounds in dtDelete
2025/11/20 21:16 upstream 8e621c9a3375 2cc4c24a .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root UBSAN: array-index-out-of-bounds in dtDelete
2025/05/26 21:41 upstream 0ff41df1cb26 06877188 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root UBSAN: array-index-out-of-bounds in dtDelete
2025/04/21 01:39 upstream 6fea5fabd332 2a20f901 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root UBSAN: array-index-out-of-bounds in dtDelete
2025/03/14 19:51 upstream e3a854b577cb e2826670 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root UBSAN: array-index-out-of-bounds in dtDelete
* Struck through repros no longer work on HEAD.