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List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:3485:b0:433:2943:3a78 with SMTP id e9e14a558f8ab-4335f478e35mr32160345ab.31.1762500563895; Thu, 06 Nov 2025 23:29:23 -0800 (PST) Date: Thu, 06 Nov 2025 23:29:23 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <690d9fd3.a70a0220.22f260.0021.GAE@google.com> Subject: [syzbot] [jfs?] general protection fault in txCommit (2) 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: 8bb886cb8f3a Merge tag 'edac_urgent_for_v6.18_rc5' of git:.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1207c114580000 kernel config: https://syzkaller.appspot.com/x/.config?x=41ad820f608cb833 dashboard link: https://syzkaller.appspot.com/bug?extid=9489c9f9f3d437221ea2 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=1033d012580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=11ea1bcd980000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/393661e2054b/disk-8bb886cb.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/ba628b757c6a/vmlinux-8bb886cb.xz kernel image: https://storage.googleapis.com/syzbot-assets/15255c2cc8ad/bzImage-8bb886cb.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/5ffcac92a4cf/mount_0.gz fsck result: failed (log: https://syzkaller.appspot.com/x/fsck.log?x=125bf932580000) IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+9489c9f9f3d437221ea2@syzkaller.appspotmail.com loop0: detected capacity change from 0 to 32768 UFO tlock:0xffffc900034fa[ 113.512606][ T5985] UFO tlock:0xffffc900034fa1b0 Oops: general protection fault, probably for non-canonical address 0xdffffc0000000005: 0000 [#1] SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000028-0x000000000000002f] CPU: 0 UID: 0 PID: 5985 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 RIP: 0010:txLog fs/jfs/jfs_txnmgr.c:1390 [inline] RIP: 0010:txCommit+0xafb/0x5430 fs/jfs/jfs_txnmgr.c:1265 Code: 3c 10 00 74 12 4c 89 f7 e8 f2 cb e2 fe 48 ba 00 00 00 00 00 fc ff df 4c 89 74 24 68 4d 8b 36 4d 8d 7e 28 4c 89 f8 48 c1 e8 03 <80> 3c 10 00 74 12 4c 89 ff e8 c7 cb e2 fe 48 ba 00 00 00 00 00 fc RSP: 0018:ffffc90003fc74e0 EFLAGS: 00010206 RAX: 0000000000000005 RBX: 0000000000000948 RCX: 1ffff9200069fd48 RDX: dffffc0000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc90003fc76b0 R08: 0000000000000000 R09: 0000000000000000 R10: dffffc0000000000 R11: fffffbfff1dac5ef R12: 0000000000000002 R13: ffffc900034fa000 R14: 0000000000000000 R15: 0000000000000028 FS: 0000555570e52500(0000) GS:ffff888126df9000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 0000000038f28000 CR4: 00000000003526f0 Call Trace: jfs_create+0x865/0xa80 fs/jfs/namei.c:156 lookup_open fs/namei.c:3796 [inline] open_last_lookups fs/namei.c:3895 [inline] path_openat+0x1500/0x3840 fs/namei.c:4131 do_filp_open+0x1fa/0x410 fs/namei.c:4161 do_sys_openat2+0x121/0x1c0 fs/open.c:1437 do_sys_open fs/open.c:1452 [inline] __do_sys_creat fs/open.c:1530 [inline] __se_sys_creat fs/open.c:1524 [inline] __x64_sys_creat+0x8f/0xc0 fs/open.c:1524 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: 0033:0x7f575dbcf6c9 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:00007fff260cfb28 EFLAGS: 00000246 ORIG_RAX: 0000000000000055 RAX: ffffffffffffffda RBX: 00007f575de25fa0 RCX: 00007f575dbcf6c9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000200000000580 RBP: 00007f575dc51f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f575de25fa0 R14: 00007f575de25fa0 R15: 0000000000000002 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:txLog fs/jfs/jfs_txnmgr.c:1390 [inline] RIP: 0010:txCommit+0xafb/0x5430 fs/jfs/jfs_txnmgr.c:1265 Code: 3c 10 00 74 12 4c 89 f7 e8 f2 cb e2 fe 48 ba 00 00 00 00 00 fc ff df 4c 89 74 24 68 4d 8b 36 4d 8d 7e 28 4c 89 f8 48 c1 e8 03 <80> 3c 10 00 74 12 4c 89 ff e8 c7 cb e2 fe 48 ba 00 00 00 00 00 fc RSP: 0018:ffffc90003fc74e0 EFLAGS: 00010206 RAX: 0000000000000005 RBX: 0000000000000948 RCX: 1ffff9200069fd48 RDX: dffffc0000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc90003fc76b0 R08: 0000000000000000 R09: 0000000000000000 R10: dffffc0000000000 R11: fffffbfff1dac5ef R12: 0000000000000002 R13: ffffc900034fa000 R14: 0000000000000000 R15: 0000000000000028 FS: 0000555570e52500(0000) GS:ffff888126df9000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 0000000038f28000 CR4: 00000000003526f0 ---------------- Code disassembly (best guess): 0: 3c 10 cmp $0x10,%al 2: 00 74 12 4c add %dh,0x4c(%rdx,%rdx,1) 6: 89 f7 mov %esi,%edi 8: e8 f2 cb e2 fe call 0xfee2cbff d: 48 ba 00 00 00 00 00 movabs $0xdffffc0000000000,%rdx 14: fc ff df 17: 4c 89 74 24 68 mov %r14,0x68(%rsp) 1c: 4d 8b 36 mov (%r14),%r14 1f: 4d 8d 7e 28 lea 0x28(%r14),%r15 23: 4c 89 f8 mov %r15,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 80 3c 10 00 cmpb $0x0,(%rax,%rdx,1) <-- trapping instruction 2e: 74 12 je 0x42 30: 4c 89 ff mov %r15,%rdi 33: e8 c7 cb e2 fe call 0xfee2cbff 38: 48 rex.W 39: ba 00 00 00 00 mov $0x0,%edx 3e: 00 fc add %bh,%ah --- 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