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

Status: upstream: reported C repro on 2024/12/29 06:57
Bug presence: origin:upstream
[Documentation on labels]
Reported-by: syzbot+63c40a3ef45fce944739@syzkaller.appspotmail.com
First crash: 113d, last: 22h12m
▶ ▼ Bug presence (1)
Date Name Commit Repro Result
2025/03/21 upstream (ToT) b3ee1e460951 C [report] UBSAN: array-index-out-of-bounds in dtSplitPage
▶ ▼ Similar bugs (2)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KASAN: slab-use-after-free Write in dtSplitPage jfs C inconclusive 365 1h14m 127d 0/28 upstream: reported C repro on 2024/12/15 23:15
linux-6.1 UBSAN: array-index-out-of-bounds in dtSplitPage 11 4h35m 112d 0/3 upstream: reported on 2024/12/30 07:45
▶ ▼ Last patch testing requests (1)
Created Duration User Patch Repo Result
2025/04/10 17:57 26m retest repro linux-5.15.y report log

Sample crash report:
loop0: detected capacity change from 0 to 32768
================================================================================
UBSAN: array-index-out-of-bounds in fs/jfs/jfs_dtree.c:1598:11
index 27 is out of range for type 'struct lv[20]'
CPU: 1 PID: 4161 Comm: syz-executor197 Not tainted 5.15.179-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e3/0x2d0 lib/dump_stack.c:106
 ubsan_epilogue lib/ubsan.c:151 [inline]
 __ubsan_handle_out_of_bounds+0x118/0x140 lib/ubsan.c:282
 dtSplitPage+0x3e56/0x3ec0 fs/jfs/jfs_dtree.c:1598
 dtSplitUp fs/jfs/jfs_dtree.c:1089 [inline]
 dtInsert+0x14fc/0x6b00 fs/jfs/jfs_dtree.c:868
 jfs_rename+0xafa/0x1cb0 fs/jfs/namei.c:1224
 vfs_rename+0xd32/0x10f0 fs/namei.c:4832
 do_renameat2+0xe0f/0x1700 fs/namei.c:4985
 __do_sys_rename fs/namei.c:5031 [inline]
 __se_sys_rename fs/namei.c:5029 [inline]
 __x64_sys_rename+0x82/0x90 fs/namei.c:5029
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fd845348f39
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:00007ffce97f0098 EFLAGS: 00000246 ORIG_RAX: 0000000000000052
RAX: ffffffffffffffda RBX: 00007ffce97f00a0 RCX: 00007fd845348f39
RDX: 0000000000000000 RSI: 0000400000000f40 RDI: 0000400000000300
RBP: 00007ffce97f00a8 R08: 00007fd845314ea0 R09: 00007fd845314ea0
R10: 00007fd845314ea0 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffce97f0308 R14: 0000000000000001 R15: 0000000000000001
 </TASK>
================================================================================

Crashes (15):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/03/16 10:26 linux-5.15.y 0c935c049b5c e2826670 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-linux-5-15-kasan UBSAN: array-index-out-of-bounds in dtSplitPage
2025/04/18 01:47 linux-5.15.y f7347f400572 2a20f901 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan UBSAN: array-index-out-of-bounds in dtSplitPage
2025/03/26 08:26 linux-5.15.y 0c935c049b5c 89d30d73 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan UBSAN: array-index-out-of-bounds in dtSplitPage
2025/03/22 07:03 linux-5.15.y 0c935c049b5c c6512ef7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan UBSAN: array-index-out-of-bounds in dtSplitPage
2025/03/22 07:02 linux-5.15.y 0c935c049b5c c6512ef7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan UBSAN: array-index-out-of-bounds in dtSplitPage
2025/03/18 19:23 linux-5.15.y 0c935c049b5c 22a6c2b1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan UBSAN: array-index-out-of-bounds in dtSplitPage
2025/03/16 09:42 linux-5.15.y 0c935c049b5c e2826670 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan UBSAN: array-index-out-of-bounds in dtSplitPage
2025/03/16 09:42 linux-5.15.y 0c935c049b5c e2826670 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan UBSAN: array-index-out-of-bounds in dtSplitPage
2025/03/14 04:07 linux-5.15.y 0c935c049b5c e2826670 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan UBSAN: array-index-out-of-bounds in dtSplitPage
2024/12/29 06:56 linux-5.15.y 91786f140358 d3ccff63 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan UBSAN: array-index-out-of-bounds in dtSplitPage
2025/04/14 21:55 linux-5.15.y f7347f400572 0bd6db41 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan KASAN: slab-out-of-bounds Read in dtSplitPage
2025/03/27 11:40 linux-5.15.y 0c935c049b5c 20510e88 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan KASAN: use-after-free Write in dtSplitPage
2025/03/27 11:40 linux-5.15.y 0c935c049b5c 20510e88 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan KASAN: slab-out-of-bounds Write in dtSplitPage
2025/04/21 01:51 linux-5.15.y f7347f400572 2a20f901 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 KASAN: slab-out-of-bounds Read in dtSplitPage
2025/04/18 21:17 linux-5.15.y f7347f400572 2a20f901 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 KASAN: slab-out-of-bounds Read in dtSplitPage
* Struck through repros no longer work on HEAD.