From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=209.85.167.199 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1793102984; b=2o7Ni0L92e53XaieePmAswEfJL8n2aFmySXXTJ//dIEjoNirWd6zCJpCk5+so0wzkxVr Itr/SL8FdT4he2QEp4KAxss4UH/uJsY7Zylyea8hRpviATz8EdxWUCIp+QuH0j+MrzTqD PrPthEMdM0TCGAA4GXdWgr67AccUJ2gfWf09FPB4HpDhsN0lFBtjlXKIWutOm8RkUjZIY w2/Zvt50vfI/fMHBhTyHF5phpTgrkL0dHJJfDIPNqOSVgWjhzCT2g0mhJR2GUSXvy0kai eAGDzGB81tKpDJMvPH1cszXS5hCrAFHcVJ4WUf4TXfaanSgX3AvTuKYvW7UKfDpzHZA== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1793102984; h=DMARC-Filter:Received:X-Google-DKIM-Signature:X-Forwarded-Encrypted: X-Gm-Message-State:MIME-Version:X-Received:Date: X-Google-Appengine-App-Id:X-Google-Appengine-App-Id-Alias:Message-ID: Subject:From:To:Content-Type; bh=IptyB1qH+sm+JTCt8RytNfuKsrQJA6F1Il01uz2n03Y=; b=fpRMwWl43RM+bMzjyESjDKlotcKkHnzKVs50sz25nrbh+YaXfb378pwVTci9NgacnP0u oPlw3RM2YOy0xVadtRvLF9oiunCu4xt/K+EurFY9AS4fB5p3m1ilC2E+QmG1q1BMg8SCo UioVV/K3K+/qVKpSGdjvPtW4SkpvwrX1wOGZeqs769amTzgYDFQpTIeB6KmgSik82wutT NDCVuJBZ2ah9ItPgowvfY1iU6PQlpSfRq0HhdIILBYzzwjQhf22TMbq0L3GSgnaf5KXDR nemlsP7e6/eEvRFbNgjzbFObigdKIJ1TtZi+oas8etOn5du8SrcKrT1muynl+OklY8g== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=fail header.from=syzkaller.appspotmail.com; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com; arc=none smtp.remote-ip=209.85.167.199 Received: from mail-oi1-f199.google.com (mail-oi1-f199.google.com [209.85.167.199]) (using TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits) key-exchange X25519 server-signature ECDSA (prime256v1) server-digest SHA256) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id D2BFF606A31B for ; Tue, 27 Oct 2026 12:09:43 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.2 smtp.subspace.kernel.org D2BFF606A31B 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-oi1-f199.google.com with SMTP id 5614622812f47-4f4612a1a5cso1019886b6e.0 for ; Tue, 27 Oct 2026 05:09:43 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20260707; t=1793102983; x=1793707783; h=content-type:to:from:subject:message-id:date:mime-version :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to :content-type; bh=IptyB1qH+sm+JTCt8RytNfuKsrQJA6F1Il01uz2n03Y=; b=hOP51pI7x36mAfytOfALA2K6vuhj/Uvi/jt86rg7LLa5fW+qRjMCYyM0dIYUBjqSBR M0QgeqQpf/Q+JS952JM06z/pUqrUChsKS2IZFUfMRWBKVRtH+Y+HRyKDJF7nuUhDkh5s ZZXZ/MHkthSBteEkUMYXAbMvzKVv+uq1I3xqEKPIKJdl/ridkqNF3bC7zGOxK0HreSOi JIeP6OWM4JF9AcLy/JBtYsqVPJvsJITSvASX1IqkB929sWGMcKk+adOTbDKe7fVxhqoi KTx1m0s5eCMpj7XqH0+67FPKHOmq730nnIIKU9GdgibCQ2h+Rqi3A9hjyWFP8nVhVNCN 1/NA== X-Forwarded-Encrypted: i=1; AKwUvBwrKPuagWLwkzvZIZkDbw70ga1IokaJzfsiLCO8w99yRPJv2tuPCgAjhbeIETcPrVVpaMzKanmnlB3Il8s=@vger.kernel.org X-Gm-Message-State: AFq9FYL9FP7LtIWlvXx8GFBv5udssjPsT23w6HHQwzBZAQmAc826Nbvq CXPjOsLgYXfQm5m1I6X9A3rXTwXZT8e2ZbsdB7sy8C5uW4M1z8wxmFMcXrB6Q2nmsbvlIAoQmOl nwqolhIumxH6CO1XfCSxLhoAM9Wl0EGVPoAwHv9N+QykA4kk7hyFEHVVeEvQ= X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 X-Received: by 2002:a05:6808:448a:b0:4d6:9133:cfee with SMTP id 5614622812f47-55f813acd37mr1352531b6e.51.1793102982923; Tue, 27 Oct 2026 05:09:42 -0700 (PDT) Date: Tue, 27 Oct 2026 05:09:42 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6ae09486.768774f5.3237ab.0017.GAE@google.com> Subject: [syzbot] [gfs2?] WARNING in iomap_writepages 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: d135ab453a74 Merge tag 'backlight-next-7.4' of git://git.k.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=13d4dee1580000 kernel config: https://syzkaller.appspot.com/x/.config?x=ca6085a265c4d259 dashboard link: https://syzkaller.appspot.com/bug?extid=5e659793378ad9e06387 compiler: Debian clang version 22.1.8 (1~deb13u4), Debian LLD 22.1.8 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-d135ab45.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/4dc024e5978e/vmlinux-d135ab45.xz kernel image: https://storage.googleapis.com/syzbot-assets/1f7c8ddcde45/bzImage-d135ab45.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+5e659793378ad9e06387@syzkaller.appspotmail.com ------------[ cut here ]------------ (current->flags & PF_MEMALLOC) WARNING: fs/iomap/buffered-io.c:2084 at iomap_writepages+0x29f/0x2d0 fs/iomap/buffered-io.c:2084, CPU#0: kswapd0/82 Modules linked in: CPU: 0 UID: 0 PID: 82 Comm: kswapd0 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:iomap_writepages+0x29f/0x2d0 fs/iomap/buffered-io.c:2084 Code: 00 65 48 8b 0d 8a be 45 12 48 3b 4c 24 60 75 42 48 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc e8 f2 ab 4e ff 90 <0f> 0b 90 b8 fb ff ff ff eb ac 44 89 f9 80 e1 07 80 c1 03 38 c1 0f RSP: 0018:ffffc90000ebe5a0 EFLAGS: 00010293 RAX: ffffffff827a71be RBX: 0000000000000800 RCX: ffff888000300000 RDX: 0000000000000000 RSI: 0000000000000800 RDI: 0000000000000000 RBP: ffffc90000ebe650 R08: ffffc90000ebe70f R09: 0000000000000000 R10: ffffc90000ebe6a0 R11: fffff520001d7ce2 R12: 1ffff920001d7cb8 R13: dffffc0000000000 R14: ffff8880144b0218 R15: ffff88800030002c FS: 0000000000000000(0000) GS:ffff88808ac1d000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffcb345acd0 CR3: 000000001f98a000 CR4: 0000000000352ef0 Call Trace: gfs2_writepages+0x1bb/0x2a0 fs/gfs2/aops.c:175 do_writepages+0x338/0x560 mm/page-writeback.c:2560 filemap_writeback mm/filemap.c:387 [inline] filemap_fdatawrite_range mm/filemap.c:412 [inline] filemap_fdatawrite+0x1e9/0x2f0 mm/filemap.c:418 gfs2_ordered_write fs/gfs2/log.c:730 [inline] __gfs2_log_flush+0x836/0x1d90 fs/gfs2/log.c:1135 gfs2_log_flush+0x34/0x50 fs/gfs2/log.c:1217 evict_linked_inode fs/gfs2/super.c:1439 [inline] gfs2_evict_inode+0x787/0x13f0 fs/gfs2/super.c:1506 evict+0x624/0xb50 fs/inode.c:822 dispose_list fs/inode.c:864 [inline] prune_icache_sb+0x223/0x2d0 fs/inode.c:1010 super_cache_scan+0x390/0x4a0 fs/super.c:227 do_shrink_slab+0x6d0/0x10d0 mm/shrinker.c:445 shrink_slab_memcg mm/shrinker.c:562 [inline] shrink_slab+0x838/0x1210 mm/shrinker.c:640 shrink_one+0x396/0x10f0 mm/vmscan.c:5315 shrink_many mm/vmscan.c:5376 [inline] lru_gen_shrink_node mm/vmscan.c:5454 [inline] shrink_node+0x631e/0x6b20 mm/vmscan.c:6460 kswapd_shrink_node mm/vmscan.c:7253 [inline] balance_pgdat mm/vmscan.c:7424 [inline] kswapd+0x1ff4/0x3a20 mm/vmscan.c:7700 kthread+0x38b/0x480 kernel/kthread.c:436 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 --- 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