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charset="UTF-8" syzbot has found a reproducer for the following issue on: HEAD commit: 475c850a7fdd Add linux-next specific files for 20250606 git tree: linux-next console+strace: https://syzkaller.appspot.com/x/log.txt?x=11fe2a82580000 kernel config: https://syzkaller.appspot.com/x/.config?x=28859360c84ac63d dashboard link: https://syzkaller.appspot.com/bug?extid=13ba7f3e9a17f77250fe compiler: Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=11c79a0c580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=162aa9d4580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/2f1cf8485b7a/disk-475c850a.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/976adb9f739e/vmlinux-475c850a.xz kernel image: https://storage.googleapis.com/syzbot-assets/0ac20b1308b7/bzImage-475c850a.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/fad6178a795b/mount_0.gz fsck result: failed (log: https://syzkaller.appspot.com/x/fsck.log?x=122aa9d4580000) IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+13ba7f3e9a17f77250fe@syzkaller.appspotmail.com loop0: detected capacity change from 0 to 32768 ------------[ cut here ]------------ UBSAN: shift-out-of-bounds in fs/jfs/super.c:140:14 shift exponent 115 is too large for 64-bit type 's64' (aka 'long long') CPU: 1 UID: 0 PID: 5841 Comm: syz-executor190 Not tainted 6.15.0-next-20250606-syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Call Trace: dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 ubsan_epilogue+0xa/0x40 lib/ubsan.c:233 __ubsan_handle_shift_out_of_bounds+0x386/0x410 lib/ubsan.c:494 jfs_statfs+0x4d1/0x550 fs/jfs/super.c:140 statfs_by_dentry fs/statfs.c:66 [inline] vfs_statfs+0x144/0x2d0 fs/statfs.c:90 ovl_check_namelen fs/overlayfs/super.c:388 [inline] ovl_lower_dir fs/overlayfs/super.c:404 [inline] ovl_get_lowerstack fs/overlayfs/super.c:1150 [inline] ovl_fill_super+0x9d9/0x35d0 fs/overlayfs/super.c:1416 vfs_get_super fs/super.c:1323 [inline] get_tree_nodev+0xbb/0x150 fs/super.c:1342 vfs_get_tree+0x8f/0x2b0 fs/super.c:1802 do_new_mount+0x24a/0xa40 fs/namespace.c:3874 do_mount fs/namespace.c:4211 [inline] __do_sys_mount fs/namespace.c:4422 [inline] __se_sys_mount+0x317/0x410 fs/namespace.c:4399 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f8347037a39 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:00007ffdd0158b28 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0000200000000000 RCX: 00007f8347037a39 RDX: 0000200000000000 RSI: 0000200000000140 RDI: 0000000000000000 RBP: 00007f834708005e R08: 00002000000003c0 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0030656c69662f2e R13: 65756e69746e6f63 R14: 633d73726f727265 R15: 0000000000000001 ---[ 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.