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X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <69bba650.050a0220.1b2d94.0008.GAE@google.com> Subject: [syzbot] [fuse?] general protection fault in fuse_opt_fd From: syzbot To: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, miklos@szeredi.hu, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 95c541ddfb08 Add linux-next specific files for 20260316 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=16193d52580000 kernel config: https://syzkaller.appspot.com/x/.config?x=bcbfd105f37ac57 dashboard link: https://syzkaller.appspot.com/bug?extid=3c38f696edf9e331cd53 compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=10b378da580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16b162d6580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/b0922a82fd2b/disk-95c541dd.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/869dec734b46/vmlinux-95c541dd.xz kernel image: https://storage.googleapis.com/syzbot-assets/def78cc5a6eb/bzImage-95c541dd.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+3c38f696edf9e331cd53@syzkaller.appspotmail.com Oops: general protection fault, probably for non-canonical address 0xdffffc0000000009: 0000 [#1] SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000048-0x000000000000004f] CPU: 1 UID: 0 PID: 6045 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 RIP: 0010:fuse_opt_fd+0x49/0x220 fs/fuse/inode.c:807 Code: 4c 8d bb 98 00 00 00 4c 89 f8 48 c1 e8 03 80 3c 28 00 74 08 4c 89 ff e8 15 f7 e4 fe 4d 8b 3f 4d 8d 66 48 4c 89 e0 48 c1 e8 03 <80> 3c 28 00 74 08 4c 89 e7 e8 f9 f6 e4 fe 49 81 3c 24 00 2b 29 8c RSP: 0018:ffffc90002dd7a68 EFLAGS: 00010206 RAX: 0000000000000009 RBX: ffff88807a954a00 RCX: ffff888031dbdb80 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff88807a954a00 RBP: dffffc0000000000 R08: ffffffff824b518a R09: ffffffff8eb5d6a0 R10: 0000000000000009 R11: 0000000000000000 R12: 0000000000000048 R13: 0000000000000002 R14: 0000000000000000 R15: ffff88801ebe3080 FS: 00005555945e4500(0000) GS:ffff888124ee2000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000003000 CR3: 000000007ae84000 CR4: 00000000003526f0 Call Trace: fuse_parse_param+0x69b/0xa80 fs/fuse/inode.c:865 vfs_parse_fs_param+0x1a9/0x420 fs/fs_context.c:132 vfs_parse_fs_qstr fs/fs_context.c:173 [inline] vfs_parse_fs_string include/linux/fs_context.h:142 [inline] vfs_parse_monolithic_sep+0x283/0x360 fs/fs_context.c:213 do_new_mount+0x304/0xd30 fs/namespace.c:3836 do_mount fs/namespace.c:4173 [inline] __do_sys_mount fs/namespace.c:4372 [inline] __se_sys_mount+0x31d/0x420 fs/namespace.c:4349 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f0932d9c799 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fffbe74bc28 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f0933015fa0 RCX: 00007f0932d9c799 RDX: 0000200000002100 RSI: 00002000000020c0 RDI: 0000000000000000 RBP: 00007f0932e32c99 R08: 0000200000002140 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f0933015fac R14: 00007f0933015fa0 R15: 00007f0933015fa0 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:fuse_opt_fd+0x49/0x220 fs/fuse/inode.c:807 Code: 4c 8d bb 98 00 00 00 4c 89 f8 48 c1 e8 03 80 3c 28 00 74 08 4c 89 ff e8 15 f7 e4 fe 4d 8b 3f 4d 8d 66 48 4c 89 e0 48 c1 e8 03 <80> 3c 28 00 74 08 4c 89 e7 e8 f9 f6 e4 fe 49 81 3c 24 00 2b 29 8c RSP: 0018:ffffc90002dd7a68 EFLAGS: 00010206 RAX: 0000000000000009 RBX: ffff88807a954a00 RCX: ffff888031dbdb80 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff88807a954a00 RBP: dffffc0000000000 R08: ffffffff824b518a R09: ffffffff8eb5d6a0 R10: 0000000000000009 R11: 0000000000000000 R12: 0000000000000048 R13: 0000000000000002 R14: 0000000000000000 R15: ffff88801ebe3080 FS: 00005555945e4500(0000) GS:ffff888124ee2000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000003000 CR3: 000000007ae84000 CR4: 00000000003526f0 ---------------- Code disassembly (best guess): 0: 4c 8d bb 98 00 00 00 lea 0x98(%rbx),%r15 7: 4c 89 f8 mov %r15,%rax a: 48 c1 e8 03 shr $0x3,%rax e: 80 3c 28 00 cmpb $0x0,(%rax,%rbp,1) 12: 74 08 je 0x1c 14: 4c 89 ff mov %r15,%rdi 17: e8 15 f7 e4 fe call 0xfee4f731 1c: 4d 8b 3f mov (%r15),%r15 1f: 4d 8d 66 48 lea 0x48(%r14),%r12 23: 4c 89 e0 mov %r12,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 80 3c 28 00 cmpb $0x0,(%rax,%rbp,1) <-- trapping instruction 2e: 74 08 je 0x38 30: 4c 89 e7 mov %r12,%rdi 33: e8 f9 f6 e4 fe call 0xfee4f731 38: 49 81 3c 24 00 2b 29 cmpq $0xffffffff8c292b00,(%r12) 3f: 8c --- 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