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AJvYcCV7TARWEICDSbQ8Xphnk1qjvHcJT50y1sjMOrpkINrxs9qZpKZre++PE/F7jpnpgqyGDsuuetwwRI+JVx4=@vger.kernel.org X-Gm-Message-State: AOJu0YxH4aN4hCC6CTKedBXfialWK498NnJrp43SMfN/vLVSlpep7Grx WT8x8wTrpcipuYqJZfUY1d/Ya7Ir8oMAkhH1Qa3ua2WnvoUtljSPtmKEKb2+qi+Q2fL8q7FAtZ4 ju/p1IdQx7hoh5398r8mHTky2pOoFJOOBEbKijyIry+NRAPGsc6/w1jk5hTg= X-Google-Smtp-Source: AGHT+IH6UbAeecHDuAvKxcgIbUdjXm6ThLX5Z1PFdR7HStKUtHJb37/hGofOkznOzs0WR8f7YiMgLVCXf0PYmZDHeUFRFSxpnx+R Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:12e9:b0:430:c0e4:9e43 with SMTP id e9e14a558f8ab-430c52343e2mr39728875ab.6.1760675732668; Thu, 16 Oct 2025 21:35:32 -0700 (PDT) Date: Thu, 16 Oct 2025 21:35:32 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <68f1c794.a00a0220.361615.000f.GAE@google.com> Subject: [syzbot] [jfs?] UBSAN: shift-out-of-bounds in dbAllocAG (3) From: syzbot To: jfs-discussion@lists.sourceforge.net, linux-kernel@vger.kernel.org, shaggy@kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 7ea30958b305 Merge tag 'vfs-6.18-rc2.fixes' of git://git.k.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=10eee5e2580000 kernel config: https://syzkaller.appspot.com/x/.config?x=af9170887d81dea1 dashboard link: https://syzkaller.appspot.com/bug?extid=4b717071f1eecb2972df compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=16a64b04580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=12c8bdcd980000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/3e5414d12be0/disk-7ea30958.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/f88a30954acd/vmlinux-7ea30958.xz kernel image: https://storage.googleapis.com/syzbot-assets/aa2283ab9f73/bzImage-7ea30958.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/ffc7d81ee40c/mount_0.gz fsck result: failed (log: https://syzkaller.appspot.com/x/fsck.log?x=1585552f980000) IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+4b717071f1eecb2972df@syzkaller.appspotmail.com ------------[ cut here ]------------ UBSAN: shift-out-of-bounds in fs/jfs/jfs_dmap.c:1440:48 shift exponent -1 is negative CPU: 0 UID: 0 PID: 6076 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT_{RT,(full)} Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 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 dbAllocAG+0xfc0/0xff0 fs/jfs/jfs_dmap.c:1440 dbAlloc+0x5a8/0xba0 fs/jfs/jfs_dmap.c:877 extBalloc fs/jfs/jfs_extent.c:336 [inline] extAlloc+0x54a/0xfb0 fs/jfs/jfs_extent.c:127 jfs_get_block+0x346/0xab0 fs/jfs/inode.c:254 __block_write_begin_int+0x6b5/0x1900 fs/buffer.c:2145 block_write_begin+0x8a/0x120 fs/buffer.c:2256 jfs_write_begin+0x35/0x80 fs/jfs/inode.c:306 generic_perform_write+0x29d/0x8c0 mm/filemap.c:4242 generic_file_write_iter+0x118/0x550 mm/filemap.c:4385 new_sync_write fs/read_write.c:593 [inline] vfs_write+0x5d5/0xb40 fs/read_write.c:686 ksys_write+0x14b/0x260 fs/read_write.c:738 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fa99272eec9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fffa62c1048 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007fa992985fa0 RCX: 00007fa99272eec9 RDX: 0000000000000014 RSI: 0000200000000380 RDI: 0000000000000005 RBP: 00007fa9927b1f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fa992985fa0 R14: 00007fa992985fa0 R15: 0000000000000003 ---[ 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@googlegroups.com. 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