linux-kernel - [syzbot] [ocfs2?] KMSAN: uninit-value in ocfs2_get

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Message-ID: <66f36739.050a0220.30ac7d.0004.GAE@google.com>
Date: Tue, 24 Sep 2024 18:28:25 -0700
From: syzbot <syzbot+9709e73bae885b05314b@...kaller.appspotmail.com>
To: jlbec@...lplan.org, joseph.qi@...ux.alibaba.com, 
	linux-kernel@...r.kernel.org, mark@...heh.com, ocfs2-devel@...ts.linux.dev, 
	syzkaller-bugs@...glegroups.com
Subject: [syzbot] [ocfs2?] KMSAN: uninit-value in ocfs2_get_block

Hello,

syzbot found the following issue on:

HEAD commit:    baeb9a7d8b60 Merge tag 'sched-rt-2024-09-17' of git://git...
git tree:       upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=172af607980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=acaa65be5f19fc5a
dashboard link: https://syzkaller.appspot.com/bug?extid=9709e73bae885b05314b
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=161e2ca9980000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=151bff00580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/cac89ddb3388/disk-baeb9a7d.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/ddec90b149ab/vmlinux-baeb9a7d.xz
kernel image: https://storage.googleapis.com/syzbot-assets/f8db8244cc07/bzImage-baeb9a7d.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/25ed405f5727/mount_0.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+9709e73bae885b05314b@...kaller.appspotmail.com

OCFS2: ERROR (device loop0): int __ocfs2_find_path(struct ocfs2_caching_info *, struct ocfs2_extent_list *, u32, path_insert_t *, void *): Owner 17 has empty extent list at depth 312
On-disk corruption discovered. Please run fsck.ocfs2 once the filesystem is unmounted.
OCFS2: Returning error to the calling process.
(syz-executor337,5180,0):ocfs2_find_leaf:1940 ERROR: status = -30
(syz-executor337,5180,0):ocfs2_get_clusters_nocache:421 ERROR: status = -30
(syz-executor337,5180,0):ocfs2_get_clusters:624 ERROR: status = -30
(syz-executor337,5180,0):ocfs2_extent_map_get_blocks:671 ERROR: status = -30
=====================================================
BUG: KMSAN: uninit-value in ocfs2_get_block+0xed2/0x2710 fs/ocfs2/aops.c:159
 ocfs2_get_block+0xed2/0x2710 fs/ocfs2/aops.c:159
 do_mpage_readpage+0xc45/0x2780 fs/mpage.c:225
 mpage_readahead+0x43f/0x840 fs/mpage.c:374
 ocfs2_readahead+0x269/0x320 fs/ocfs2/aops.c:381
 read_pages+0x193/0x1110 mm/readahead.c:160
 page_cache_ra_unbounded+0x901/0x9f0 mm/readahead.c:273
 do_page_cache_ra mm/readahead.c:303 [inline]
 force_page_cache_ra+0x3b1/0x4b0 mm/readahead.c:332
 force_page_cache_readahead mm/internal.h:347 [inline]
 generic_fadvise+0x6b0/0xa90 mm/fadvise.c:106
 vfs_fadvise mm/fadvise.c:185 [inline]
 ksys_fadvise64_64 mm/fadvise.c:199 [inline]
 __do_sys_fadvise64 mm/fadvise.c:214 [inline]
 __se_sys_fadvise64 mm/fadvise.c:212 [inline]
 __x64_sys_fadvise64+0x1fb/0x3a0 mm/fadvise.c:212
 x64_sys_call+0xe11/0x3ba0 arch/x86/include/generated/asm/syscalls_64.h:222
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Local variable p_blkno created at:
 ocfs2_get_block+0xc7/0x2710 fs/ocfs2/aops.c:140
 do_mpage_readpage+0xc45/0x2780 fs/mpage.c:225

CPU: 0 UID: 0 PID: 5180 Comm: syz-executor337 Not tainted 6.11.0-syzkaller-07341-gbaeb9a7d8b60 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
=====================================================

---
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@...glegroups.com.

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