Hello, syzbot found the following issue on: HEAD commit: a6bd6c933339 Add linux-next specific files for 20240328 git tree: linux-next console+strace: https://syzkaller.appspot.com/x/log.txt?x=179ebb76180000 kernel config: https://syzkaller.appspot.com/x/.config?x=b0058bda1436e073 dashboard link: https://syzkaller.appspot.com/bug?extid=b5ca8a249162c4b9a7d0 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=13ef71f9180000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=132cf70d180000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/7c1618ff7d25/disk-a6bd6c93.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/875519f620fe/vmlinux-a6bd6c93.xz kernel image: https://storage.googleapis.com/syzbot-assets/ad92b057fb96/bzImage-a6bd6c93.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/0e8af372eab3/mount_0.gz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+b5ca8a249162c4b9a7d0@xxxxxxxxxxxxxxxxxxxxxxxxx loop0: detected capacity change from 0 to 32768 ------------[ cut here ]------------ UBSAN: shift-out-of-bounds in fs/jfs/jfs_dmap.c:2639:11 shift exponent 121 is too large for 32-bit type 'int' CPU: 0 PID: 5079 Comm: syz-executor118 Not tainted 6.9.0-rc1-next-20240328-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 Call Trace: <TASK> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114 ubsan_epilogue lib/ubsan.c:217 [inline] __ubsan_handle_shift_out_of_bounds+0x3c8/0x420 lib/ubsan.c:454 dbSplit+0x21a/0x220 fs/jfs/jfs_dmap.c:2639 dbAllocBits+0x4e5/0x9a0 fs/jfs/jfs_dmap.c:2191 dbAllocDmap fs/jfs/jfs_dmap.c:2032 [inline] dbAllocDmapLev+0x250/0x4a0 fs/jfs/jfs_dmap.c:1986 dbAllocCtl+0x113/0x920 fs/jfs/jfs_dmap.c:1823 dbAllocAG+0x28f/0x10b0 fs/jfs/jfs_dmap.c:1364 dbAlloc+0x658/0xca0 fs/jfs/jfs_dmap.c:888 dtSplitUp fs/jfs/jfs_dtree.c:979 [inline] dtInsert+0xda7/0x6b00 fs/jfs/jfs_dtree.c:868 jfs_create+0x7ba/0xb90 fs/jfs/namei.c:137 lookup_open fs/namei.c:3497 [inline] open_last_lookups fs/namei.c:3566 [inline] path_openat+0x1425/0x3240 fs/namei.c:3796 do_filp_open+0x235/0x490 fs/namei.c:3826 do_sys_openat2+0x13e/0x1d0 fs/open.c:1406 do_sys_open fs/open.c:1421 [inline] __do_sys_open fs/open.c:1429 [inline] __se_sys_open fs/open.c:1425 [inline] __x64_sys_open+0x225/0x270 fs/open.c:1425 do_syscall_64+0xfb/0x240 entry_SYSCALL_64_after_hwframe+0x6d/0x75 RIP: 0033:0x7faf13ba19b9 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:00007fff9504bea8 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 00007fff9504c088 RCX: 00007faf13ba19b9 RDX: 0000000000000000 RSI: 0000000000000040 RDI: 0000000020000400 RBP: 00007faf13c1a610 R08: 00000000000060cc R09: 0000000000000000 R10: 00007fff9504bd70 R11: 0000000000000246 R12: 0000000000000001 R13: 00007fff9504c078 R14: 0000000000000001 R15: 0000000000000001 </TASK> ---[ end trace ]--- --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title 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. If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup