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

Status: upstream: reported C repro on 2025/07/04 21:27
Bug presence: origin:upstream
[Documentation on labels]
Reported-by: syzbot+34272791bb194e2b8b24@syzkaller.appspotmail.com
First crash: 127d, last: 1d18h
▶ ▼ Bug presence (1)
Date Name Commit Repro Result
2025/09/21 upstream (ToT) f975f08c2e89 C [report] KASAN: slab-use-after-free Write in txEnd
▶ ▼ Similar bugs (3)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream UBSAN: array-index-out-of-bounds in add_missing_indices jfs 15 C 187 152d 348d 29/29 fixed on 2025/07/08 00:33
linux-6.1 UBSAN: array-index-out-of-bounds in add_missing_indices origin:upstream missing-backport 19 C inconclusive 10 63d 300d 0/3 upstream: reported C repro on 2025/01/13 05:49
linux-5.15 UBSAN: array-index-out-of-bounds in add_missing_indices origin:upstream 19 C error 7 156d 280d 0/3 upstream: reported C repro on 2025/02/02 08:00
▶ ▼ Fix bisection attempts (1)
Created Duration User Patch Repo Result
2025/10/25 06:08 1h49m bisect fix linux-6.6.y OK (0) job log log

Sample crash report:
 ... Log Wrap ... Log Wrap ... Log Wrap ...
 ... Log Wrap ... Log Wrap ... Log Wrap ...
================================================================================
UBSAN: array-index-out-of-bounds in fs/jfs/jfs_dtree.c:2650:28
index -128 is out of range for type 'struct dtslot[128]'
CPU: 0 PID: 5943 Comm: syz.0.17 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x16c/0x230 lib/dump_stack.c:106
 ubsan_epilogue+0xa/0x30 lib/ubsan.c:217
 __ubsan_handle_out_of_bounds+0xe3/0xf0 lib/ubsan.c:348
 add_missing_indices+0x6a0/0xbb0 fs/jfs/jfs_dtree.c:2650
 jfs_readdir+0x1d80/0x3a90 fs/jfs/jfs_dtree.c:3020
 wrap_directory_iterator+0x92/0xd0 fs/readdir.c:67
 iterate_dir+0x1c2/0x580 fs/readdir.c:106
 __do_sys_getdents64 fs/readdir.c:405 [inline]
 __se_sys_getdents64+0xe9/0x260 fs/readdir.c:390
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f471318eba9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffd5324ab98 EFLAGS: 00000246 ORIG_RAX: 00000000000000d9
RAX: ffffffffffffffda RBX: 00007f47133d5fa0 RCX: 00007f471318eba9
RDX: 0000000000000037 RSI: 00002000000000c0 RDI: 0000000000000005
RBP: 00007f4713211e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f47133d5fa0 R14: 00007f47133d5fa0 R15: 0000000000000003
 </TASK>
================================================================================

Crashes (13):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/09/18 00:39 linux-6.6.y 60a9e718726f e2beed91 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-linux-6-6-kasan UBSAN: array-index-out-of-bounds in add_missing_indices
2025/11/08 00:03 linux-6.6.y 0a805b6ea8cd 4e1406b4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan UBSAN: array-index-out-of-bounds in add_missing_indices
2025/11/08 00:01 linux-6.6.y 0a805b6ea8cd 4e1406b4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan UBSAN: array-index-out-of-bounds in add_missing_indices
2025/11/03 01:27 linux-6.6.y 0a805b6ea8cd 2c50b6a9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan UBSAN: array-index-out-of-bounds in add_missing_indices
2025/11/03 01:26 linux-6.6.y 0a805b6ea8cd 2c50b6a9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan UBSAN: array-index-out-of-bounds in add_missing_indices
2025/09/18 00:02 linux-6.6.y 60a9e718726f e2beed91 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan UBSAN: array-index-out-of-bounds in add_missing_indices
2025/08/31 21:34 linux-6.6.y cc1a1c5b404a 807a3b61 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan UBSAN: array-index-out-of-bounds in add_missing_indices
2025/08/31 21:34 linux-6.6.y cc1a1c5b404a 807a3b61 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan UBSAN: array-index-out-of-bounds in add_missing_indices
2025/08/04 00:53 linux-6.6.y 3a8ababb8b6a 7368264b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan UBSAN: array-index-out-of-bounds in add_missing_indices
2025/07/08 09:57 linux-6.6.y a5df3a702b2c 4f67c4ae .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan UBSAN: array-index-out-of-bounds in add_missing_indices
2025/07/08 09:54 linux-6.6.y a5df3a702b2c 4f67c4ae .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan UBSAN: array-index-out-of-bounds in add_missing_indices
2025/07/04 21:27 linux-6.6.y 3f5b4c104b7d d869b261 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan UBSAN: array-index-out-of-bounds in add_missing_indices
2025/07/04 21:26 linux-6.6.y 3f5b4c104b7d d869b261 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan UBSAN: array-index-out-of-bounds in add_missing_indices
* Struck through repros no longer work on HEAD.