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AFNElJ/qz1S1gWFUX+uROLFV7nY7+dKFwTGc1+7SQSDPHo4fRk7QQayZsWd04auZz+48Z5mbURqCH4QV7eLOkwb1@vger.kernel.org X-Gm-Message-State: AOJu0Yxe67NVXCSGQYpW2Ap48uCnf7ZEQyltFN4CCDUdkTI6REeocMyg ngZu50e+pOS9PoMWV2ShreU5sUx4BzKmietVIm0rABCytzYeTdLy4wtwHr1F6+rrNhES0I4qu/2 +hQxtMBXmVudsOTlkAsIOPt+gznsJNI99teqAaKty03HWQuT9d1oIlkT4A1o= Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:1797:b0:6a1:50e9:d586 with SMTP id 006d021491bc7-6a35556394fmr1504720eaf.67.1783374259504; Mon, 06 Jul 2026 14:44:19 -0700 (PDT) Date: Mon, 06 Jul 2026 14:44:19 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a4c21b3.c76b52dc.34afef.0002.GAE@google.com> Subject: [syzbot] [netfs?] WARNING in netfs_writepages (3) From: syzbot To: dhowells@redhat.com, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, netfs@lists.linux.dev, pc@manguebit.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 7404ce516372 Merge tag 's390-7.2-3' of git://git.kernel.or.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=119f1661580000 kernel config: https://syzkaller.appspot.com/x/.config?x=48ef5c5c0f192153 dashboard link: https://syzkaller.appspot.com/bug?extid=0da43efa72f88bd3a8af 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=1727ebde580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=172dbec1580000 Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-7404ce51.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/e63433d84892/vmlinux-7404ce51.xz kernel image: https://storage.googleapis.com/syzbot-assets/7542fae0615e/bzImage-7404ce51.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+0da43efa72f88bd3a8af@syzkaller.appspotmail.com R10: 0000000000028011 R11: 0000000000000246 R12: 0000000000000001 R13: 00007fe029a25fac R14: 00007fe029a25fa0 R15: 00007fe029a25fa0 ------------[ cut here ]------------ folio != NULL WARNING: fs/netfs/write_issue.c:603 at netfs_writepages+0x883/0xa10 fs/netfs/write_issue.c:603, CPU#3: syz.0.17/5919 Modules linked in: CPU: 3 UID: 0 PID: 5919 Comm: syz.0.17 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:netfs_writepages+0x883/0xa10 fs/netfs/write_issue.c:603 Code: 48 89 df e8 3f 8b 7b ff 48 8b 4c 24 08 48 89 da 4c 89 e6 4c 89 f7 e8 ec 34 7f ff 48 85 c0 0f 84 c1 fe ff ff e8 0e c7 3d ff 90 <0f> 0b 90 e9 b3 fe ff ff e8 00 c7 3d ff 48 b8 00 00 00 00 00 fc ff RSP: 0018:ffffc9000415f178 EFLAGS: 00010293 RAX: 0000000000000000 RBX: ffffea00014f2580 RCX: ffffffff824b4bda RDX: ffff88802bcea540 RSI: ffffffff82cc0992 RDI: ffff88802bcea540 RBP: fffffffffffffff4 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: ffffc9000415f348 R13: ffff888046848bc0 R14: ffff888046848dd8 R15: dffffc0000000000 FS: 0000555567857500(0000) GS:ffff8880d60ec000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000002901 CR3: 0000000025ac6000 CR4: 0000000000352ef0 Call Trace: do_writepages+0x278/0x600 mm/page-writeback.c:2571 filemap_writeback+0x22d/0x2e0 mm/filemap.c:387 v9fs_mmap_vm_close fs/9p/vfs_file.c:496 [inline] v9fs_mmap_vm_close+0x137/0x1e0 fs/9p/vfs_file.c:489 vma_close mm/internal.h:190 [inline] vms_clean_up_area mm/vma.c:1318 [inline] __mmap_setup mm/vma.c:2476 [inline] __mmap_region+0x890/0x2db0 mm/vma.c:2756 mmap_region+0x527/0x620 mm/vma.c:2860 do_mmap+0xc63/0x12f0 mm/mmap.c:560 vm_mmap_pgoff+0x29e/0x470 mm/util.c:581 ksys_mmap_pgoff+0x3cb/0x610 mm/mmap.c:606 __do_sys_mmap arch/x86/kernel/sys_x86_64.c:89 [inline] __se_sys_mmap arch/x86/kernel/sys_x86_64.c:82 [inline] __x64_sys_mmap+0x125/0x190 arch/x86/kernel/sys_x86_64.c:82 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: 0033:0x7fe02979de59 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:00007fff3ad0a858 EFLAGS: 00000246 ORIG_RAX: 0000000000000009 RAX: ffffffffffffffda RBX: 00007fe029a25fa0 RCX: 00007fe02979de59 RDX: 0000000000000002 RSI: 0000000000b36000 RDI: 0000200000000000 RBP: 00007fff3ad0a8c0 R08: 0000000000000004 R09: 0000000000000000 R10: 0000000000028011 R11: 0000000000000246 R12: 0000000000000001 R13: 00007fe029a25fac R14: 00007fe029a25fa0 R15: 00007fe029a25fa0 --- 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