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charset="UTF-8" syzbot has found a reproducer for the following issue on: HEAD commit: 4099a71718b0 Merge tag 'sched-urgent-2024-12-29' of git://.. git tree: upstream console+strace: https://syzkaller.appspot.com/x/log.txt?x=1313a818580000 kernel config: https://syzkaller.appspot.com/x/.config?x=4c4096b0d467a682 dashboard link: https://syzkaller.appspot.com/bug?extid=9120834fc227768625ba compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=15382ac4580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=146a70b0580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/c085f394f11d/disk-4099a717.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/5aac16cee3e0/vmlinux-4099a717.xz kernel image: https://storage.googleapis.com/syzbot-assets/f9412e3c8aa0/bzImage-4099a717.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/3ac4b5cf3ab6/mount_0.gz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+9120834fc227768625ba@syzkaller.appspotmail.com ------------[ cut here ]------------ UBSAN: array-index-out-of-bounds in fs/jfs/jfs_dtree.c:3096:10 index 237 is out of range for type 'struct dtslot[128]' CPU: 0 UID: 0 PID: 5822 Comm: syz-executor740 Not tainted 6.13.0-rc4-syzkaller-00110-g4099a71718b0 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Call Trace: __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 dtReadFirst+0x622/0xc50 fs/jfs/jfs_dtree.c:3096 dtReadNext fs/jfs/jfs_dtree.c:3147 [inline] jfs_readdir+0x9aa/0x3c50 fs/jfs/jfs_dtree.c:2862 wrap_directory_iterator+0x91/0xd0 fs/readdir.c:65 iterate_dir+0x571/0x800 fs/readdir.c:108 __do_sys_getdents64 fs/readdir.c:403 [inline] __se_sys_getdents64+0x1e2/0x4b0 fs/readdir.c:389 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: 0033:0x7f1a02212fa3 Code: c1 66 0f 1f 44 00 00 48 83 c4 08 48 89 ef 5b 5d e9 a2 48 fb ff 66 90 b8 ff ff ff 7f 48 39 c2 48 0f 47 d0 b8 d9 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 05 c3 0f 1f 40 00 48 c7 c2 b8 ff ff ff f7 d8 RSP: 002b:00007fffd5e0be18 EFLAGS: 00000293 ORIG_RAX: 00000000000000d9 RAX: ffffffffffffffda RBX: 000055557b4c7730 RCX: 00007f1a02212fa3 RDX: 0000000000008000 RSI: 000055557b4c7730 RDI: 0000000000000004 RBP: 000055557b4c7704 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000001000 R11: 0000000000000293 R12: ffffffffffffffb8 R13: 0000000000000010 R14: 000055557b4c7700 R15: 00007fffd5e0e090 ---[ 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.