From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oa1-f80.google.com (mail-oa1-f80.google.com [209.85.160.80]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 8AD171386C9 for ; Fri, 12 Dec 2025 01:45:31 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.160.80 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1765503933; cv=none; b=H7Dlk87o+JlAp2C6u6La2LrOi0h3dY0ZjLhA2/LZntP+Ff15Mc/gAn8vj2g56smLoJ61lSkQtGRZbTwHNPEgg6k1nnji2NYTCIezlsMEJTfzxiekxgGsEldSGUDCzsSuCGidbkSDB/cOQmLq91NxM4jlI8RBr7fJlCCP7gMw/6I= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1765503933; c=relaxed/simple; bh=jlvWHl7y4RgxyEhG5TolpT+5BZxcoIx+tXWlh2WaPG4=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=RedreS6mKKe3JheYG91fh+p8X5aztpQkQDkFIjV62ht/ZoN40clxI/fOm0ADfaBZ+foFpn0awV6pemdZrhFfAdEQPEits98YZzdKtF23YwHqE5OYyVKmcF9a2XWLKTmdkju4lYz6u0x3/4RRkjb4EGiCVtHC48cnnWnkL95GkrA= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com; arc=none smtp.client-ip=209.85.160.80 Authentication-Results: smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com Received: by mail-oa1-f80.google.com with SMTP id 586e51a60fabf-3f0d1a7a9c2so490538fac.3 for ; Thu, 11 Dec 2025 17:45:31 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1765503930; x=1766108730; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=rJeHpWGHUmObWowYq3P1dvj/KOiXFn7HVoWTaajokZE=; b=FYfMhs0on9fWpyJ0LvmLBYZ4k3o55EJbUWjVvdkOp83RANGeRfDy0+Ns3ilaegAFbc gkG/PY7FAgpbKc9WUKa2bmuXRHtYtgADJnCP+emLBhUU62Aqb27xDH12UyYNerVSCfoN KcPY4+cq62o5yh319VmUNjIswVzkGCSBnlVWB+3n3h49xOT5ARWfVmxE0gdXX64eAA6O /cLp5xivPVSJdXRXVI2pouz9DX/h82jPTWmBMFasaIRbbb5xUYdnLr6PS+pGJPqxjVSM SopApKEqjdtZRmgFctX9plkNaJRwjz09iiK4pG3mAmS2E8SSekbNt680E8uJe86Vm2II jvWQ== X-Forwarded-Encrypted: i=1; AJvYcCUYzOSSS2IxnzE7kaRU2S3hA6FHrsoTexknIdzMh54nPSqC4QBc2pghoxTmcTUhwsZ4bpUP@lists.linux.dev X-Gm-Message-State: AOJu0YzDdzMbHoV3VfRsg7/JJxE2wePwADVzPXFyVVhyq3rETImplej7 UK3d0NUsydX7zXwBAbywVRRzsQjWjtXCam4HgZ9ZpzueNWnE2hMvd3rIO0IvmwlUbcPBE0APd4i tYwnxFvfuDL6O0GUhqmlV+EM/VZOFrQvajJ3k+xt4sEKJYeY939i6j6icfns= X-Google-Smtp-Source: AGHT+IHqHBZ6aCsR+5fmkp/OjvTHUAEmtZtXy0YzVVPakHjg+RqPoqT1AQxQPhTql0VkqO7UMO6+4nYZ2bBw1Ev5VOsS147jZCEp Precedence: bulk X-Mailing-List: gfs2@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:1c9c:b0:659:9a49:8e07 with SMTP id 006d021491bc7-65b45273592mr228187eaf.73.1765503930568; Thu, 11 Dec 2025 17:45:30 -0800 (PST) Date: Thu, 11 Dec 2025 17:45:30 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <693b73ba.a70a0220.33cd7b.0044.GAE@google.com> Subject: [syzbot] [gfs2?] general protection fault in gfs2_remove_from_journal (2) From: syzbot To: agruenba@redhat.com, gfs2@lists.linux.dev, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: e811c33b1f13 Merge tag 'drm-fixes-2025-11-08' of https://g.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1609aa92580000 kernel config: https://syzkaller.appspot.com/x/.config?x=929790bc044e87d7 dashboard link: https://syzkaller.appspot.com/bug?extid=cff8e1b82d7911dd051c compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-e811c33b.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/9a1852775b7f/vmlinux-e811c33b.xz kernel image: https://storage.googleapis.com/syzbot-assets/d2f7ca742771/bzImage-e811c33b.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+cff8e1b82d7911dd051c@syzkaller.appspotmail.com Zero length message leads to an empty skb Oops: general protection fault, probably for non-canonical address 0xdffffc0000000005: 0000 [#1] SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000028-0x000000000000002f] CPU: 0 UID: 0 PID: 5331 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 RIP: 0010:gfs2_remove_from_journal+0x3cc/0x6d0 fs/gfs2/meta_io.c:359 Code: 3a 4c 89 e7 e8 05 ab 27 fe eb 30 e8 9e 6b c0 fd 48 8b 6c 24 10 4c 8d 65 2c 4c 89 e0 48 c1 e8 03 49 be 00 00 00 00 00 fc ff df <42> 0f b6 04 30 84 c0 4c 8b 3c 24 0f 85 aa 01 00 00 41 ff 04 24 48 RSP: 0018:ffffc9000d4973f8 EFLAGS: 00010207 RAX: 0000000000000005 RBX: ffff88801c0d0000 RCX: 0000000000100000 RDX: ffffc9000e683000 RSI: 0000000000000e73 RDI: 0000000000000e74 RBP: 0000000000000000 R08: ffff8880434e0caf R09: 1ffff1100869c195 R10: dffffc0000000000 R11: ffffed100869c196 R12: 000000000000002c R13: 0000000000000001 R14: dffffc0000000000 R15: ffff8880511d41e0 FS: 00007fa4cc38a6c0(0000) GS:ffff88808d730000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000000140 CR3: 000000004233d000 CR4: 0000000000352ef0 Call Trace: gfs2_discard fs/gfs2/aops.c:597 [inline] gfs2_invalidate_folio+0x579/0x750 fs/gfs2/aops.c:631 folio_invalidate mm/truncate.c:140 [inline] truncate_cleanup_folio+0x2d8/0x430 mm/truncate.c:160 truncate_inode_pages_range+0x233/0xda0 mm/truncate.c:379 do_gfs2_set_flags fs/gfs2/file.c:254 [inline] gfs2_fileattr_set+0x80a/0x9b0 fs/gfs2/file.c:311 vfs_fileattr_set+0x932/0xb90 fs/file_attr.c:298 ioctl_setflags+0x180/0x1e0 fs/file_attr.c:334 do_vfs_ioctl+0x8ed/0x1430 fs/ioctl.c:560 __do_sys_ioctl fs/ioctl.c:595 [inline] __se_sys_ioctl+0x82/0x170 fs/ioctl.c:583 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: 0033:0x7fa4cb58f6c9 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:00007fa4cc38a038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fa4cb7e6090 RCX: 00007fa4cb58f6c9 RDX: 0000200000000140 RSI: 0000000040086602 RDI: 0000000000000005 RBP: 00007fa4cb611f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fa4cb7e6128 R14: 00007fa4cb7e6090 R15: 00007ffcd258e628 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:gfs2_remove_from_journal+0x3cc/0x6d0 fs/gfs2/meta_io.c:359 Code: 3a 4c 89 e7 e8 05 ab 27 fe eb 30 e8 9e 6b c0 fd 48 8b 6c 24 10 4c 8d 65 2c 4c 89 e0 48 c1 e8 03 49 be 00 00 00 00 00 fc ff df <42> 0f b6 04 30 84 c0 4c 8b 3c 24 0f 85 aa 01 00 00 41 ff 04 24 48 RSP: 0018:ffffc9000d4973f8 EFLAGS: 00010207 RAX: 0000000000000005 RBX: ffff88801c0d0000 RCX: 0000000000100000 RDX: ffffc9000e683000 RSI: 0000000000000e73 RDI: 0000000000000e74 RBP: 0000000000000000 R08: ffff8880434e0caf R09: 1ffff1100869c195 R10: dffffc0000000000 R11: ffffed100869c196 R12: 000000000000002c R13: 0000000000000001 R14: dffffc0000000000 R15: ffff8880511d41e0 FS: 00007fa4cc38a6c0(0000) GS:ffff88808d730000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000000140 CR3: 000000004233d000 CR4: 0000000000352ef0 ---------------- Code disassembly (best guess): 0: 3a 4c 89 e7 cmp -0x19(%rcx,%rcx,4),%cl 4: e8 05 ab 27 fe call 0xfe27ab0e 9: eb 30 jmp 0x3b b: e8 9e 6b c0 fd call 0xfdc06bae 10: 48 8b 6c 24 10 mov 0x10(%rsp),%rbp 15: 4c 8d 65 2c lea 0x2c(%rbp),%r12 19: 4c 89 e0 mov %r12,%rax 1c: 48 c1 e8 03 shr $0x3,%rax 20: 49 be 00 00 00 00 00 movabs $0xdffffc0000000000,%r14 27: fc ff df * 2a: 42 0f b6 04 30 movzbl (%rax,%r14,1),%eax <-- trapping instruction 2f: 84 c0 test %al,%al 31: 4c 8b 3c 24 mov (%rsp),%r15 35: 0f 85 aa 01 00 00 jne 0x1e5 3b: 41 ff 04 24 incl (%r12) 3f: 48 rex.W --- 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 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