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AJvYcCXqNENGoeYgoO+/zdxSOJx1yZHEMr22km8HpkbdG3N96W9gU7M78vaoFgXvQZ28qIYCG5djxiI1gj8ZopYk@vger.kernel.org X-Gm-Message-State: AOJu0YwTeXbyIKMvXh4rQz31plwclgYHEfZanwdFf7MaCgSaZ6fdIf3T fKXPfMi+sJi1G2p2xkxzW/JEm3524nBD8MaFw1RwI4IaG6ssy1VfQORhu+1leRs9I1qAhg/QikE sxebMOn2hswgnDpotAkW3R5RY7R4Av3/Qip/x48FFDKB+CmdwlXwq/hBCPIg= Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:1352:b0:675:2e2e:56a6 with SMTP id 006d021491bc7-6759bba81e6mr1335065eaf.74.1770924154130; Thu, 12 Feb 2026 11:22:34 -0800 (PST) Date: Thu, 12 Feb 2026 11:22:34 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <698e287a.a70a0220.2c38d7.009e.GAE@google.com> Subject: [syzbot] [fs?] general protection fault in grab_requested_root From: syzbot To: brauner@kernel.org, jack@suse.cz, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com, viro@zeniv.linux.org.uk Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: dc855b77719f Merge tag 'irq-drivers-2026-02-09' of git://g.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=13136ae6580000 kernel config: https://syzkaller.appspot.com/x/.config?x=86c6013ce1247095 dashboard link: https://syzkaller.appspot.com/bug?extid=9e03a9535ea65f687a44 compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=15da0b3a580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=14e28e5a580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/a31372ead89f/disk-dc855b77.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/657357081566/vmlinux-dc855b77.xz kernel image: https://storage.googleapis.com/syzbot-assets/278d7f265ba3/bzImage-dc855b77.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+9e03a9535ea65f687a44@syzkaller.appspotmail.com Oops: general protection fault, probably for non-canonical address 0xdffffc000000001e: 0000 [#1] SMP KASAN PTI KASAN: null-ptr-deref in range [0x00000000000000f0-0x00000000000000f7] CPU: 0 UID: 0 PID: 5998 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026 RIP: 0010:mnt_ns_empty fs/mount.h:197 [inline] RIP: 0010:grab_requested_root+0xde/0x3c0 fs/namespace.c:5636 Code: 02 00 00 49 39 5d 18 0f 84 cd 01 00 00 e8 0a 10 78 ff 48 8d bb 08 01 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 82 02 00 00 48 8b 83 08 01 00 00 48 85 c0 0f 84 RSP: 0018:ffffc90003027d88 EFLAGS: 00010206 RAX: dffffc0000000000 RBX: ffffffffffffffea RCX: ffffffff828e8167 RDX: 000000000000001e RSI: ffffffff828e7fb6 RDI: 00000000000000f2 RBP: ffffc90003027db0 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: ffff88802b220000 R13: ffff88803156d4e0 R14: ffff88807b4d7028 R15: ffff88807b4d7010 FS: 000055555e0dd500(0000) GS:ffff8881245bf000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 000000002c608000 CR4: 00000000003526f0 Call Trace: do_statmount fs/namespace.c:5699 [inline] __do_sys_statmount+0x359/0x2440 fs/namespace.c:5949 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x106/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f12d359bf79 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:00007ffd0e2fee68 EFLAGS: 00000246 ORIG_RAX: 00000000000001c9 RAX: ffffffffffffffda RBX: 00007f12d3815fa0 RCX: 00007f12d359bf79 RDX: 00000000000001fe RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00007f12d36327e0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f12d3815fac R14: 00007f12d3815fa0 R15: 00007f12d3815fa0 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:mnt_ns_empty fs/mount.h:197 [inline] RIP: 0010:grab_requested_root+0xde/0x3c0 fs/namespace.c:5636 Code: 02 00 00 49 39 5d 18 0f 84 cd 01 00 00 e8 0a 10 78 ff 48 8d bb 08 01 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 82 02 00 00 48 8b 83 08 01 00 00 48 85 c0 0f 84 RSP: 0018:ffffc90003027d88 EFLAGS: 00010206 RAX: dffffc0000000000 RBX: ffffffffffffffea RCX: ffffffff828e8167 RDX: 000000000000001e RSI: ffffffff828e7fb6 RDI: 00000000000000f2 RBP: ffffc90003027db0 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: ffff88802b220000 R13: ffff88803156d4e0 R14: ffff88807b4d7028 R15: ffff88807b4d7010 FS: 000055555e0dd500(0000) GS:ffff8881245bf000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 000000002c608000 CR4: 00000000003526f0 ---------------- Code disassembly (best guess): 0: 02 00 add (%rax),%al 2: 00 49 39 add %cl,0x39(%rcx) 5: 5d pop %rbp 6: 18 0f sbb %cl,(%rdi) 8: 84 cd test %cl,%ch a: 01 00 add %eax,(%rax) c: 00 e8 add %ch,%al e: 0a 10 or (%rax),%dl 10: 78 ff js 0x11 12: 48 8d bb 08 01 00 00 lea 0x108(%rbx),%rdi 19: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 20: fc ff df 23: 48 89 fa mov %rdi,%rdx 26: 48 c1 ea 03 shr $0x3,%rdx * 2a: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) <-- trapping instruction 2e: 0f 85 82 02 00 00 jne 0x2b6 34: 48 8b 83 08 01 00 00 mov 0x108(%rbx),%rax 3b: 48 85 c0 test %rax,%rax 3e: 0f .byte 0xf 3f: 84 .byte 0x84 --- 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