From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oo1-f78.google.com (mail-oo1-f78.google.com [209.85.161.78]) (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 A45E935FF40 for ; Wed, 17 Dec 2025 15:06:30 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.161.78 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1765983992; cv=none; b=G1xPqlWqRJM9mCPBYE99j7bYUnciPQesK0MkES9d1jXg4zWcR1kwb5p9Ayr2MRYIeDFgVnzzSQaMzUWCKBrk7fQN4b+iwcAtcFzh8zmFmAEJS8/LA/D2XxtwGRkEud9v6Aym5Zktd5qwVgfMM+HOZlf0AM3mcUzLwNq/odRLIlc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1765983992; c=relaxed/simple; bh=guTVx0EHN1D1Uhou4Rx7F0yW/ZXIS6CzojBXCRNbR1g=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=Sm3WFAtwLGWeJIl14KSub38xTG1ZZa4jR6YEo9HS3g4i82cIfpPdJUovgAIIrExTbJkDisZ4fmsNxhEknMh/IWbXlZl6BITbJHsYeU6RBm1askIAaQQlYrHoU/kcgcMeOWfOTq6nmwve4vs50ddk4BY0g3IasfWmKFkeOLNevSE= 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=209.85.161.78 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-oo1-f78.google.com with SMTP id 006d021491bc7-65b31ec93e7so10548355eaf.3 for ; Wed, 17 Dec 2025 07:06:30 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1765983989; x=1766588789; h=content-transfer-encoding:to:from:subject:message-id:date :mime-version:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=+LXp+/OiwgJFK4+HBN1KxSKPTjJfUuQ79kirzdSqjQA=; b=a0SgwNNpPB5mqxwUG5G4GwIqD+brLeUjXIBPBUP1lR2c/G1vaXVku/tCy2Vt136PtY jrdXRVagY1L/eFYFiV+2WisoyxbXBRfQzUy/siQT7AcS8/uy7IIKG6e+mxMCgb394nqN Jf3nvbvuQrAb+tnQg+ruDdIdewg27qfaYTIpR/f8gsNYGjMhLy1tlQpUx434mvX+1zMj a7G+vrZQyvF/+oqbk2CYg190vrDdnfrZlcEu0bw6OlQU3H+vOR+2bqR498VemnhRodCD ASmR6+ATVlxA1CCLoMxGNY4Ure2kwQ8dqhQP7k+8XYWjcorO2xa4A/9mcrQGcds9+1Fm 7s+A== X-Forwarded-Encrypted: i=1; AJvYcCU1XWtadnulzyvrISUlUuMY/N6xuMlQZUNTlz74toaSUV2943QZCrBsydcMVr9FGkTjEw+WmhCqB2Y5NhE=@vger.kernel.org X-Gm-Message-State: AOJu0Yw54IwHTVpB8ESYsEIrimx/NEd+h5dyLQRxZUSKoRGwA6o4rhHK bGvEg4fV/3g0Fd509qVGck6UckiC8baFo92Qjaw4VR5TtVO5OY5OSPg+0AtDqeCpTrdoRh+g/rS fgAv+8JVkc/rwnVkJIPNl1ZJdNulIBxvG3fTisGziGgb6qcv8uRhpj68oNAQ= X-Google-Smtp-Source: AGHT+IEepE1vOkZRfZw65Yq1mLKX8fjSXWFd+RCC7vexsDa9QIOBmOOjGkoOx7rg/oWkXOnGdoUhwKHlpGYWuc7/8UmLqU7NJZSW Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:4df7:b0:659:9a49:8f11 with SMTP id 006d021491bc7-65b45151581mr7967725eaf.34.1765983989465; Wed, 17 Dec 2025 07:06:29 -0800 (PST) Date: Wed, 17 Dec 2025 07:06:29 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6942c6f5.a70a0220.207337.0063.GAE@google.com> Subject: [syzbot] [xfs] general protection fault in workingset_refault (3) From: syzbot To: akpm@linux-foundation.org, axelrasmussen@google.com, cem@kernel.org, david@kernel.org, hannes@cmpxchg.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-xfs@vger.kernel.org, lorenzo.stoakes@oracle.com, mhocko@kernel.org, shakeel.butt@linux.dev, syzkaller-bugs@googlegroups.com, weixugc@google.com, yuanchu@google.com, zhengqi.arch@bytedance.com Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hello, syzbot found the following issue on: HEAD commit: ea1013c15392 Merge tag 'bpf-fixes' of git://git.kernel.org.= . git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=3D16a839b4580000 kernel config: https://syzkaller.appspot.com/x/.config?x=3D513255d80ab78f2= b dashboard link: https://syzkaller.appspot.com/bug?extid=3Dccf9f05f06b4b951f= 3cd 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/d90= 0f083ada3/non_bootable_disk-ea1013c1.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/ea4d0b50128d/vmlinux-= ea1013c1.xz kernel image: https://storage.googleapis.com/syzbot-assets/f2e7f1524121/bzI= mage-ea1013c1.xz IMPORTANT: if you fix the issue, please add the following tag to the commit= : Reported-by: syzbot+ccf9f05f06b4b951f3cd@syzkaller.appspotmail.com Zero length message leads to an empty skb loop0: detected capacity change from 0 to 32768 =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D WARNING: The mand mount option has been deprecated and and is ignored by this kernel. Remove the mand option from the mount to silence this warning. =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D xfs: Unknown parameter '=EF=BF=BD=04' Oops: general protection fault, probably for non-canonical address 0xdffffc= 00000009c0: 0000 [#1] SMP KASAN NOPTI KASAN: probably user-memory-access in range [0x0000000000004e00-0x000000000= 0004e07] CPU: 0 UID: 0 PID: 5343 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full= )=20 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16= .3-2~bpo12+1 04/01/2014 RIP: 0010:mem_cgroup_lruvec include/linux/memcontrol.h:720 [inline] RIP: 0010:lru_gen_test_recent mm/workingset.c:275 [inline] RIP: 0010:lru_gen_refault mm/workingset.c:296 [inline] RIP: 0010:workingset_refault+0x3f8/0x1170 mm/workingset.c:546 Code: 74 0c 48 c7 c7 e0 6a a2 8f e8 04 05 1d 00 4c 8b 35 3d c7 95 0d 49 81 = c6 78 0c 00 00 4d 8d bd 00 4e 00 00 4c 89 f8 48 c1 e8 03 <42> 0f b6 04 20 8= 4 c0 0f 85 ce 05 00 00 49 63 07 4d 8d 34 c6 4c 89 RSP: 0018:ffffc9000a7b7880 EFLAGS: 00010206 RAX: 00000000000009c0 RBX: 0000000000000383 RCX: 0000000000100000 RDX: ffffc900208d2000 RSI: 0000000000000472 RDI: 0000000000000473 RBP: ffffc9000a7b7998 R08: ffff88801f7524c0 R09: 0000000000000002 R10: 0000000000000406 R11: 0000000000000002 R12: dffffc0000000000 R13: 0000000000000000 R14: ffff88801baf8c78 R15: 0000000000004e00 FS: 00007fbc75e8f6c0(0000) GS:ffff88808d22a000(0000) knlGS:000000000000000= 0 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000000040 CR3: 000000001234e000 CR4: 0000000000352ef0 Call Trace: filemap_add_folio+0x33f/0x540 mm/filemap.c:981 do_read_cache_folio+0x32e/0x590 mm/filemap.c:4063 freader_get_folio+0x3c7/0x830 lib/buildid.c:58 freader_fetch+0xa3/0x750 lib/buildid.c:101 __build_id_parse+0x133/0x7d0 lib/buildid.c:289 do_procmap_query fs/proc/task_mmu.c:733 [inline] procfs_procmap_ioctl+0x76f/0xce0 fs/proc/task_mmu.c:813 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:597 [inline] __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fbc74f8f7c9 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 f= f 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fbc75e8f038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fbc751e5fa0 RCX: 00007fbc74f8f7c9 RDX: 0000200000000180 RSI: 00000000c0686611 RDI: 000000000000000d RBP: 00007fbc75013f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fbc751e6038 R14: 00007fbc751e5fa0 R15: 00007fff29f355e8 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:mem_cgroup_lruvec include/linux/memcontrol.h:720 [inline] RIP: 0010:lru_gen_test_recent mm/workingset.c:275 [inline] RIP: 0010:lru_gen_refault mm/workingset.c:296 [inline] RIP: 0010:workingset_refault+0x3f8/0x1170 mm/workingset.c:546 Code: 74 0c 48 c7 c7 e0 6a a2 8f e8 04 05 1d 00 4c 8b 35 3d c7 95 0d 49 81 = c6 78 0c 00 00 4d 8d bd 00 4e 00 00 4c 89 f8 48 c1 e8 03 <42> 0f b6 04 20 8= 4 c0 0f 85 ce 05 00 00 49 63 07 4d 8d 34 c6 4c 89 RSP: 0018:ffffc9000a7b7880 EFLAGS: 00010206 RAX: 00000000000009c0 RBX: 0000000000000383 RCX: 0000000000100000 RDX: ffffc900208d2000 RSI: 0000000000000472 RDI: 0000000000000473 RBP: ffffc9000a7b7998 R08: ffff88801f7524c0 R09: 0000000000000002 R10: 0000000000000406 R11: 0000000000000002 R12: dffffc0000000000 R13: 0000000000000000 R14: ffff88801baf8c78 R15: 0000000000004e00 FS: 00007fbc75e8f6c0(0000) GS:ffff88808d22a000(0000) knlGS:000000000000000= 0 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f9f4cc08120 CR3: 000000001234e000 CR4: 0000000000352ef0 ---------------- Code disassembly (best guess): 0: 74 0c je 0xe 2: 48 c7 c7 e0 6a a2 8f mov $0xffffffff8fa26ae0,%rdi 9: e8 04 05 1d 00 call 0x1d0512 e: 4c 8b 35 3d c7 95 0d mov 0xd95c73d(%rip),%r14 # 0xd95c752 15: 49 81 c6 78 0c 00 00 add $0xc78,%r14 1c: 4d 8d bd 00 4e 00 00 lea 0x4e00(%r13),%r15 23: 4c 89 f8 mov %r15,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 0f b6 04 20 movzbl (%rax,%r12,1),%eax <-- trapping instruct= ion 2f: 84 c0 test %al,%al 31: 0f 85 ce 05 00 00 jne 0x605 37: 49 63 07 movslq (%r15),%rax 3a: 4d 8d 34 c6 lea (%r14,%rax,8),%r14 3e: 4c rex.WR 3f: 89 .byte 0x89 --- 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