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AHgh+RrlZFNCtEASHNekceUwAXULkDY77hcrpRLoAVdPbaQW0v/vKKCoBEO2gTxyZW9aaYtWhMfA@lists.linux.dev X-Gm-Message-State: AOJu0Yy5aKY04eGYs6qw20RH0X91pquM7wC595RnrzWkiVvLrPAZMaC6 ViRZXruaBUE+mi908sMBNa3563eNidjdalNMds1W+Z8Q2w0x8IWvG/g66S00EQpcQ8cjQJbkk42 W3Cv7Lrh3axmsnwqK7MEPntR2Xlkn2W+B/p75HJZkW9Q1Twf91KMWo56DS1w= Precedence: bulk X-Mailing-List: v9fs@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6808:1909:b0:4a4:989:bb20 with SMTP id 5614622812f47-4ab353f0b8amr4188739b6e.24.1784870792044; Thu, 23 Jul 2026 22:26:32 -0700 (PDT) Date: Thu, 23 Jul 2026 22:26:32 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a62f788.dde6c935.cf6c8.000e.GAE@google.com> Subject: [syzbot] [v9fs?] WARNING in v9fs_init_request (2) From: syzbot To: asmadeus@codewreck.org, ericvh@kernel.org, linux-kernel@vger.kernel.org, linux_oss@crudebyte.com, lucho@ionkov.net, syzkaller-bugs@googlegroups.com, v9fs@lists.linux.dev Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 1590cf032971 Linux 7.2-rc4 git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1446a746580000 kernel config: https://syzkaller.appspot.com/x/.config?x=48ef5c5c0f192153 dashboard link: https://syzkaller.appspot.com/bug?extid=344c09c64fcd8d3d2782 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=1632bc32580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=13e0b789580000 Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-1590cf03.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/3ad7477f3064/vmlinux-1590cf03.xz kernel image: https://storage.googleapis.com/syzbot-assets/8e7a9174d4d6/bzImage-1590cf03.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+344c09c64fcd8d3d2782@syzkaller.appspotmail.com ------------[ cut here ]------------ folio expected an open fid inode->i_ino=4580113 WARNING: fs/9p/vfs_addr.c:168 at v9fs_init_request+0x451/0x540 fs/9p/vfs_addr.c:168, CPU#2: syz.0.21/5945 Modules linked in: CPU: 2 UID: 0 PID: 5945 Comm: syz.0.21 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 RIP: 0010:v9fs_init_request+0x455/0x540 fs/9p/vfs_addr.c:168 Code: 48 b8 00 00 00 00 00 fc ff df 48 8d 7b 40 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 db 00 00 00 48 8d 3d bf b1 20 0d 48 8b 73 40 <67> 48 0f b9 3a bb ea ff ff ff e9 41 fe ff ff e8 f7 98 ff fd be 02 RSP: 0018:ffffc90003c5f778 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: ffff888056c2d240 RCX: ffffffff840a4337 RDX: 1ffff1100ad85a50 RSI: 0000000004580113 RDI: ffffffff912af550 RBP: fffffffffffffffe R08: 0000000000000007 R09: fffffffffffff000 R10: fffffffffffffffe R11: 0000000000000000 R12: ffff888038e04178 R13: ffff888050c78e41 R14: ffff888050c78bd0 R15: ffff888056c2d240 FS: 00007ff5dd1fe6c0(0000) GS:ffff8880d5fe6000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ff5dd1bbff8 CR3: 000000003d81d000 CR4: 0000000000352ef0 Call Trace: netfs_alloc_request+0x71c/0xcb0 fs/netfs/objects.c:72 netfs_read_folio+0x20c/0x13f0 fs/netfs/buffered_read.c:513 filemap_read_folio+0xfc/0x3b0 mm/filemap.c:2510 do_read_cache_folio+0x2d7/0x6b0 mm/filemap.c:4140 read_mapping_folio include/linux/pagemap.h:1015 [inline] __page_get_link.isra.0+0x30/0x350 fs/namei.c:6336 page_get_link+0x44/0xf0 fs/namei.c:6366 v9fs_vfs_get_link_dotl+0x27b/0x310 fs/9p/vfs_inode_dotl.c:930 pick_link+0xd17/0x13c0 fs/namei.c:2068 step_into_slowpath+0x9ba/0xf90 fs/namei.c:2127 step_into fs/namei.c:2152 [inline] walk_component fs/namei.c:2288 [inline] lookup_last fs/namei.c:2789 [inline] path_lookupat+0x58b/0xc40 fs/namei.c:2813 filename_lookup+0x202/0x590 fs/namei.c:2842 user_path_at+0x3c/0x60 fs/namei.c:3641 do_mount fs/namespace.c:4171 [inline] __do_sys_mount fs/namespace.c:4390 [inline] __se_sys_mount fs/namespace.c:4367 [inline] __x64_sys_mount+0x1fb/0x310 fs/namespace.c:4367 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7ff5ddb9de99 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:00007ff5dd1fe028 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007ff5dde25fa0 RCX: 00007ff5ddb9de99 RDX: 00002000000004c0 RSI: 0000200000000480 RDI: 0000000000000000 RBP: 00007ff5ddc33eaf R08: 0000200000000c00 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ff5dde26038 R14: 00007ff5dde25fa0 R15: 00007ffc18202cd8 ---------------- Code disassembly (best guess): 0: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 7: fc ff df a: 48 8d 7b 40 lea 0x40(%rbx),%rdi e: 48 89 fa mov %rdi,%rdx 11: 48 c1 ea 03 shr $0x3,%rdx 15: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) 19: 0f 85 db 00 00 00 jne 0xfa 1f: 48 8d 3d bf b1 20 0d lea 0xd20b1bf(%rip),%rdi # 0xd20b1e5 26: 48 8b 73 40 mov 0x40(%rbx),%rsi * 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction 2f: bb ea ff ff ff mov $0xffffffea,%ebx 34: e9 41 fe ff ff jmp 0xfffffe7a 39: e8 f7 98 ff fd call 0xfdff9935 3e: be .byte 0xbe 3f: 02 .byte 0x2 --- 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