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AFNElJ9QJ3DPq5GoP02BXqs+XPNFimJKFFgEsMN7RceBnmiM9SHO5MjlX7AhB4yPfjAhvjB2ZTJdViXkm8Rkhpo=@vger.kernel.org X-Gm-Message-State: AOJu0YxYqT7BZMwbDJRX3rYG7Hon/e5+D7GkVz8Cvwg7f9m1ObQqEOOr kT2adj3U2LoAbnSKjLmmr1x0qSkIp9E1pHA4JmSpC0McOUzVGyqI7d2VBRlzsBOewXNcGNknPCu 55pfGRn1mThad0YZI1kw3+WT5GANCufITZM9O2woPQHORgEgjsTFGr5r5yvc= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6808:19a9:b0:48c:9bf:de7c with SMTP id 5614622812f47-48c09bfe392mr3748266b6e.43.1782051620053; Sun, 21 Jun 2026 07:20:20 -0700 (PDT) Date: Sun, 21 Jun 2026 07:20:20 -0700 In-Reply-To: <691d5900.a70a0220.2ea503.000e.GAE@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a37f324.713c5d62.148f7.0005.GAE@google.com> Subject: Re: [syzbot] [jfs?] UBSAN: array-index-out-of-bounds in diAllocBit From: syzbot To: aha310510@gmail.com, jfs-discussion@lists.sourceforge.net, linux-kernel@vger.kernel.org, shaggy@kernel.org, syzkaller-bugs@googlegroups.com, vulab@iscas.ac.cn, yun.zhou@windriver.com Content-Type: text/plain; charset="UTF-8" syzbot has found a reproducer for the following issue on: HEAD commit: 390d73adf896 Merge tag 'for-v7.2' of git://git.kernel.org/.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=12675b7a580000 kernel config: https://syzkaller.appspot.com/x/.config?x=569f5d5519e8bac8 dashboard link: https://syzkaller.appspot.com/bug?extid=015483fc71d1413f40ee compiler: Debian clang version 22.1.6 (++20260514074242+fc4aad7b5db3-1~exp1~20260514074407.73), Debian LLD 22.1.6 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1150cd56580000 Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-390d73ad.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/3cb386497ebc/vmlinux-390d73ad.xz kernel image: https://storage.googleapis.com/syzbot-assets/333ffabcead8/bzImage-390d73ad.xz mounted in repro #1: https://storage.googleapis.com/syzbot-assets/eb5e24fa41f8/mount_0.gz fsck result: failed (log: https://syzkaller.appspot.com/x/fsck.log?x=138a501c580000) mounted in repro #2: https://storage.googleapis.com/syzbot-assets/e4d71ffc49fe/mount_14.gz fsck result: failed (log: https://syzkaller.appspot.com/x/fsck.log?x=178a501c580000) mounted in repro #3: https://storage.googleapis.com/syzbot-assets/35380d3f8199/mount_18.gz fsck result: OK (log: https://syzkaller.appspot.com/x/fsck.log?x=1650cd56580000) IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+015483fc71d1413f40ee@syzkaller.appspotmail.com loop0: detected capacity change from 0 to 32768 ------------[ cut here ]------------ UBSAN: array-index-out-of-bounds in fs/jfs/jfs_imap.c:2105:2 index 8592359 is out of range for type 'struct iagctl[128]' CPU: 0 UID: 0 PID: 6143 Comm: syz.0.211 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 ubsan_epilogue+0xa/0x30 lib/ubsan.c:233 __ubsan_handle_out_of_bounds+0xe8/0xf0 lib/ubsan.c:455 diAllocBit+0xb88/0xd30 fs/jfs/jfs_imap.c:2105 diAllocIno fs/jfs/jfs_imap.c:1844 [inline] diAllocAG+0x13f7/0x1de0 fs/jfs/jfs_imap.c:1676 diAlloc+0x1e2/0x16b0 fs/jfs/jfs_imap.c:1590 ialloc+0x8c/0x8e0 fs/jfs/jfs_inode.c:56 jfs_create+0x1d8/0xae0 fs/jfs/namei.c:93 lookup_open fs/namei.c:4508 [inline] open_last_lookups fs/namei.c:4608 [inline] path_openat+0x133a/0x3830 fs/namei.c:4856 do_file_open+0x23e/0x4a0 fs/namei.c:4888 do_sys_openat2+0x115/0x200 fs/open.c:1395 do_sys_open fs/open.c:1401 [inline] __do_sys_open fs/open.c:1409 [inline] __se_sys_open fs/open.c:1405 [inline] __x64_sys_open+0x11e/0x150 fs/open.c:1405 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fc75779ce59 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:00007fc758713028 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 00007fc757a15fa0 RCX: 00007fc75779ce59 RDX: 0000000000000292 RSI: 0000000000064842 RDI: 0000200000000080 RBP: 00007fc757832e6f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fc757a16038 R14: 00007fc757a15fa0 R15: 00007ffc5cf2ad48 ---[ end trace ]--- --- If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing.