linux-kernel - [syzbot] [gfs2?] KMSAN: uninit-value in gfs2_quota

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Message-ID: <000000000000a857ec0619b5d4a9@google.com>
Date: Thu, 30 May 2024 18:23:27 -0700
From: syzbot <syzbot+54a69997acb9eddf144e@...kaller.appspotmail.com>
To: agruenba@...hat.com, gfs2@...ts.linux.dev, linux-kernel@...r.kernel.org, 
	syzkaller-bugs@...glegroups.com
Subject: [syzbot] [gfs2?] KMSAN: uninit-value in gfs2_quota_init

Hello,

syzbot found the following issue on:

HEAD commit:    614da38e2f7a Merge tag 'hid-for-linus-2024051401' of git:/..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=15bf6df0980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=f5d2cbf33633f507
dashboard link: https://syzkaller.appspot.com/bug?extid=54a69997acb9eddf144e
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/89eafb874b71/disk-614da38e.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/356000512ad9/vmlinux-614da38e.xz
kernel image: https://storage.googleapis.com/syzbot-assets/839c73939115/bzImage-614da38e.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+54a69997acb9eddf144e@...kaller.appspotmail.com

syz-executor.3: attempt to access beyond end of device
loop3: rw=12288, sector=402653184, nr_sectors = 8 limit=32768
=====================================================
BUG: KMSAN: uninit-value in gfs2_metatype_check_i fs/gfs2/util.h:125 [inline]
BUG: KMSAN: uninit-value in gfs2_quota_init+0x1c1d/0x2150 fs/gfs2/quota.c:1443
 gfs2_metatype_check_i fs/gfs2/util.h:125 [inline]
 gfs2_quota_init+0x1c1d/0x2150 fs/gfs2/quota.c:1443
 gfs2_make_fs_rw+0x4cf/0x6a0 fs/gfs2/super.c:155
 gfs2_fill_super+0x410e/0x42b0 fs/gfs2/ops_fstype.c:1288
 get_tree_bdev+0x681/0x890 fs/super.c:1614
 gfs2_get_tree+0x5c/0x340 fs/gfs2/ops_fstype.c:1341
 vfs_get_tree+0xa7/0x570 fs/super.c:1779
 do_new_mount+0x71f/0x15e0 fs/namespace.c:3352
 path_mount+0x742/0x1f20 fs/namespace.c:3679
 do_mount fs/namespace.c:3692 [inline]
 __do_sys_mount fs/namespace.c:3898 [inline]
 __se_sys_mount+0x725/0x810 fs/namespace.c:3875
 __x64_sys_mount+0xe4/0x150 fs/namespace.c:3875
 x64_sys_call+0x2bf4/0x3b50 arch/x86/include/generated/asm/syscalls_64.h:166
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcf/0x1e0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Uninit was created at:
 __alloc_pages+0x9d6/0xe70 mm/page_alloc.c:4598
 alloc_pages_mpol+0x299/0x990 mm/mempolicy.c:2264
 alloc_pages mm/mempolicy.c:2335 [inline]
 folio_alloc+0x1d0/0x230 mm/mempolicy.c:2342
 filemap_alloc_folio+0xa6/0x440 mm/filemap.c:984
 __filemap_get_folio+0xa10/0x14b0 mm/filemap.c:1926
 gfs2_getbuf+0x23f/0xcd0 fs/gfs2/meta_io.c:132
 gfs2_meta_ra+0x17f/0x7b0 fs/gfs2/meta_io.c:522
 gfs2_quota_init+0x784/0x2150 fs/gfs2/quota.c:1440
 gfs2_make_fs_rw+0x4cf/0x6a0 fs/gfs2/super.c:155
 gfs2_fill_super+0x410e/0x42b0 fs/gfs2/ops_fstype.c:1288
 get_tree_bdev+0x681/0x890 fs/super.c:1614
 gfs2_get_tree+0x5c/0x340 fs/gfs2/ops_fstype.c:1341
 vfs_get_tree+0xa7/0x570 fs/super.c:1779
 do_new_mount+0x71f/0x15e0 fs/namespace.c:3352
 path_mount+0x742/0x1f20 fs/namespace.c:3679
 do_mount fs/namespace.c:3692 [inline]
 __do_sys_mount fs/namespace.c:3898 [inline]
 __se_sys_mount+0x725/0x810 fs/namespace.c:3875
 __x64_sys_mount+0xe4/0x150 fs/namespace.c:3875
 x64_sys_call+0x2bf4/0x3b50 arch/x86/include/generated/asm/syscalls_64.h:166
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcf/0x1e0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

CPU: 1 PID: 5867 Comm: syz-executor.3 Not tainted 6.9.0-syzkaller-02707-g614da38e2f7a #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
=====================================================


---
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