linux-kernel - [syzbot] WARNING in v9fs_fid_get

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Message-ID: <00000000000086a03405eec3a706@google.com>
Date:   Thu, 01 Dec 2022 04:49:40 -0800
From:   syzbot <syzbot+a83dc51a78f0f4cf20da@...kaller.appspotmail.com>
To:     asmadeus@...ewreck.org, ericvh@...il.com,
        linux-kernel@...r.kernel.org, linux_oss@...debyte.com,
        lucho@...kov.net, syzkaller-bugs@...glegroups.com,
        v9fs-developer@...ts.sourceforge.net
Subject: [syzbot] WARNING in v9fs_fid_get_acl

Hello,

syzbot found the following issue on:

HEAD commit:    9e46a7996732 Add linux-next specific files for 20221125
git tree:       linux-next
console+strace: https://syzkaller.appspot.com/x/log.txt?x=16d02883880000
kernel config:  https://syzkaller.appspot.com/x/.config?x=11e19c740a0b2926
dashboard link: https://syzkaller.appspot.com/bug?extid=a83dc51a78f0f4cf20da
compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=143ec2d3880000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=16a73675880000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/758d818cf966/disk-9e46a799.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/f7c8696b40a5/vmlinux-9e46a799.xz
kernel image: https://storage.googleapis.com/syzbot-assets/810f9750b87f/bzImage-9e46a799.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+a83dc51a78f0f4cf20da@...kaller.appspotmail.com

------------[ cut here ]------------
WARNING: CPU: 0 PID: 5295 at mm/page_alloc.c:5527 __alloc_pages+0x412/0x5b0 mm/page_alloc.c:5527
Modules linked in:
CPU: 0 PID: 5295 Comm: syz-executor337 Not tainted 6.1.0-rc6-next-20221125-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
RIP: 0010:__alloc_pages+0x412/0x5b0 mm/page_alloc.c:5527
Code: ff ff 00 0f 84 c3 fd ff ff 80 ce 01 e9 bb fd ff ff 83 fe 0a 0f 86 ce fc ff ff 80 3d 7d 63 98 0c 00 75 09 c6 05 74 63 98 0c 01 <0f> 0b 45 31 f6 e9 52 fe ff ff 65 ff 05 75 44 3f 7e 48 c7 c0 e0 59
RSP: 0018:ffffc90003b3fac0 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 1ffff92000767f59 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000014 RDI: 0000000000000000
RBP: 0000000000040d40 R08: 0000000000000007 R09: 0000000000000000
R10: 0000000100000000 R11: 0000000000000000 R12: 0000000000000014
R13: 0000000000000000 R14: 0000000000040d40 R15: ffff888076e48000
FS:  000055555561c3c0(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f57a7ce2a70 CR3: 000000007adce000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __alloc_pages_node include/linux/gfp.h:237 [inline]
 alloc_pages_node include/linux/gfp.h:260 [inline]
 __kmalloc_large_node+0x85/0x160 mm/slab_common.c:1100
 __do_kmalloc_node mm/slab_common.c:943 [inline]
 __kmalloc+0x91/0xd0 mm/slab_common.c:968
 kmalloc include/linux/slab.h:575 [inline]
 kzalloc include/linux/slab.h:711 [inline]
 v9fs_fid_get_acl+0x78/0x120 fs/9p/acl.c:32
 __v9fs_get_acl fs/9p/acl.c:66 [inline]
 v9fs_get_acl+0x120/0x5f0 fs/9p/acl.c:93
 v9fs_mount+0x662/0xca0 fs/9p/vfs_super.c:184
 legacy_get_tree+0x109/0x220 fs/fs_context.c:610
 vfs_get_tree+0x8d/0x2f0 fs/super.c:1531
 do_new_mount fs/namespace.c:3145 [inline]
 path_mount+0x132a/0x1e20 fs/namespace.c:3475
 do_mount fs/namespace.c:3488 [inline]
 __do_sys_mount fs/namespace.c:3696 [inline]
 __se_sys_mount fs/namespace.c:3673 [inline]
 __x64_sys_mount+0x283/0x300 fs/namespace.c:3673
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f425fc05929
Code: 28 c3 e8 5a 14 00 00 66 2e 0f 1f 84 00 00 00 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 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffe17c2a538 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007ffe17c2a548 RCX: 00007f425fc05929
RDX: 0000000020000140 RSI: 0000000020000340 RDI: 0000000000000000
RBP: 00007ffe17c2a540 R08: 00000000200006c0 R09: 00007f425fbc3bf0
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>


---
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