From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-ot1-f80.google.com (mail-ot1-f80.google.com [209.85.210.80]) (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 305D113D539 for ; Fri, 9 Jan 2026 20:35:24 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.80 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767990925; cv=none; b=H0NZRFT5TIgvWiyR45vwl4rW5O63zHK05IFCOmqsBrDHRnuR9FePZIjY4F4wrl/LbqBuDDxbFn+HXuSN7TGa0aWJGGb2dv6Ut3DH1ttdJsgW0cAXyODBtolxtJqj23hk6OXPlaSJUqOGufWaVI5oDrdp+RLXGjK1Rt0f5IGp+Rc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767990925; c=relaxed/simple; bh=iETScunojCj8HFXedSPzcTwPwl4SBqmSKrXTqc3REwE=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=iyCkSlsJ8AQW7jzj00+AGSCjmql/hWZ8GtK8P+2GJRUEoX0ziGrZEM3lbF2i8Vzf9JX9aTUGW8+ykPzRm7MnzCkTtC+gBJ6/g4l0f3iU6FWQH3oxZmbUI2K21snY/H8WPrwBAZrr/ms1FO4BpceXSgKhYebvf+PJnWno7jqBo9s= 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=209.85.210.80 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-ot1-f80.google.com with SMTP id 46e09a7af769-7ce60fb3435so3367703a34.0 for ; Fri, 09 Jan 2026 12:35:23 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1767990923; x=1768595723; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=iyw9LTrAhPY9FyRwJkXlLaClhc1Xut4/cOI98uq0cGc=; b=igXm28oh5WaMJsWYUiaFEE1Qmj3PTcidSBwxsr1XF6R3p5RaVBOlsyhLFTJ3LcDpAe 7Gybrc3KZOC4BNyEIrmZ7GpFvn7ix83l1//X2qsYVdwGdiihe4dCsQwAmJkbMYKOKrA2 3ASY/CxLhp8e4ieWE3CABQM1Jd+y7/KahZOIBnQE3VdgtPpfS+iEYlOxcd1/ydenPpCS klv1XmYLck4YOUlAq7Jcaoq/msOMHqloJU28qhopZRhS4X8eRLl46npvCCRLW/Ovs0O5 +6EWKfBE0vorHuDXB5oIl9Oe5bdleAjmSM1hCazCMoB+bp/KeSg82TGOQQ1TnwxI172J 1wYg== X-Forwarded-Encrypted: i=1; AJvYcCWhVYKrgr3YkyVoZWefUAvmJ+l3pKQbrgDnPP7/vLeAcREVCaJKZ0DmwnR3jIzRPudfNsH0R/Je1oJUnIw=@vger.kernel.org X-Gm-Message-State: AOJu0YzHHmMsIyhcJuVgcNoEJi3v45kPrpbQ2fSPqICV4+XFddFpDZPe wPR+1OMiVXbTjt3vP7Y6BkbmIitV/ie0LkiCrxDZb9m7CoZS+LT02wJoPjlSTsx0XDNK/xgfhZO 0Vk54QCzt6IPt45hwsPJbG8cfU9fM3HaqzpCqYymneyHL76XICQ5Atn80c48= X-Google-Smtp-Source: AGHT+IGZeKd868POTvknQnzgELLVRXuRS0osuzyipVG7N1vmtDK1/ZRwEsRzrvfVN/AfpyypuJoJWAEn+4H7TnceAmsIhEYfP0zl 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:c28c:b0:65d:17c8:de8f with SMTP id 006d021491bc7-65f481d6553mr6643833eaf.11.1767990923104; Fri, 09 Jan 2026 12:35:23 -0800 (PST) Date: Fri, 09 Jan 2026 12:35:23 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6961668b.050a0220.1c677c.03d5.GAE@google.com> Subject: [syzbot] [jfs?] kernel BUG in dbBackSplit (2) From: syzbot To: jfs-discussion@lists.sourceforge.net, linux-kernel@vger.kernel.org, shaggy@kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 54e82e93ca93 Merge tag 'core_urgent_for_v6.19_rc4' of git:.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=153d8044580000 kernel config: https://syzkaller.appspot.com/x/.config?x=513255d80ab78f2b dashboard link: https://syzkaller.appspot.com/bug?extid=5391ade36343d8cd8801 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-54e82e93.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/f3befb5f53a4/vmlinux-54e82e93.xz kernel image: https://storage.googleapis.com/syzbot-assets/92820ca1dbd8/bzImage-54e82e93.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+5391ade36343d8cd8801@syzkaller.appspotmail.com loop0: detected capacity change from 0 to 32768 ERROR: (device loop0): dbAdjCtl: the maximum free buddy is not the old root ERROR: (device loop0): remounting filesystem as read-only read_mapping_page failed! BUG at fs/jfs/jfs_dmap.c:2700 assert(leaf[leafno] == NOFREE) ------------[ cut here ]------------ kernel BUG at fs/jfs/jfs_dmap.c:2700! Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI CPU: 0 UID: 0 PID: 5338 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:dbBackSplit+0x57c/0x580 fs/jfs/jfs_dmap.c:2700 Code: e9 02 fc ff ff e8 54 a1 77 fe 48 c7 c7 e0 63 a5 8b 48 c7 c6 20 61 a5 8b ba 8c 0a 00 00 48 c7 c1 c0 6a a5 8b e8 65 42 de fd 90 <0f> 0b 66 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 55 41 RSP: 0018:ffffc9000ae3fbb8 EFLAGS: 00010246 RAX: 000000000000003c RBX: 000000000000000a RCX: 0078dd38eec66b00 RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: ffff88801fc247d3 R09: 1ffff11003f848fa R10: dffffc0000000000 R11: ffffed1003f848fb R12: 0000000000000020 R13: ffff888035fb4010 R14: ffff888035fb4096 R15: ffff888035fb4076 FS: 00007f8e5c1f56c0(0000) GS:ffff88808d414000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f271a34b000 CR3: 0000000043e21000 CR4: 0000000000352ef0 Call Trace: dbFreeDmap fs/jfs/jfs_dmap.c:2108 [inline] dbFree+0x54e/0x650 fs/jfs/jfs_dmap.c:398 dbDiscardAG+0x7bf/0x900 fs/jfs/jfs_dmap.c:1645 jfs_ioc_trim+0x429/0x690 fs/jfs/jfs_discard.c:106 jfs_ioctl+0x2b5/0x3d0 fs/jfs/ioctl.c:131 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+0xec/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f8e5fd8f7c9 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:00007f8e5c1f5038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f8e5ffe6090 RCX: 00007f8e5fd8f7c9 RDX: 0000200000000000 RSI: 00000000c0185879 RDI: 000000000000000a RBP: 00007f8e5fe13f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f8e5ffe6128 R14: 00007f8e5ffe6090 R15: 00007ffe9f75d318 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:dbBackSplit+0x57c/0x580 fs/jfs/jfs_dmap.c:2700 Code: e9 02 fc ff ff e8 54 a1 77 fe 48 c7 c7 e0 63 a5 8b 48 c7 c6 20 61 a5 8b ba 8c 0a 00 00 48 c7 c1 c0 6a a5 8b e8 65 42 de fd 90 <0f> 0b 66 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 55 41 RSP: 0018:ffffc9000ae3fbb8 EFLAGS: 00010246 RAX: 000000000000003c RBX: 000000000000000a RCX: 0078dd38eec66b00 RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: ffff88801fc247d3 R09: 1ffff11003f848fa R10: dffffc0000000000 R11: ffffed1003f848fb R12: 0000000000000020 R13: ffff888035fb4010 R14: ffff888035fb4096 R15: ffff888035fb4076 FS: 00007f8e5c1f56c0(0000) GS:ffff88808d414000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f271a362000 CR3: 0000000043e21000 CR4: 0000000000352ef0 --- 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