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Message-ID: <000000000000f0aac5061e9f5168@google.com>
Date: Thu, 01 Aug 2024 06:38:03 -0700
From: syzbot <syzbot+24ac24ff58dc5b0d26b9@...kaller.appspotmail.com>
To: linux-kernel@...r.kernel.org, lizhi.xu@...driver.com,
syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [squashfs?] KMSAN: uninit-value in pick_link
Hello,
syzbot has tested the proposed patch but the reproducer is still triggering an issue:
KMSAN: uninit-value in pick_link
loop0: detected capacity change from 0 to 8
err: 0, folio: ffffea0001294400, in: ffff888017408878, read_folio: ffffffff82fd66b0 do_read_cache_folio
folio: ffffea0001294400, isize: -419430361, idx: 0, squashfs_symlink_read_folio
error: 0, squashfs_symlink_read_folio
err: 0, folio: ffffea0001294400, folio uptod: 1, do_read_cache_folio
=====================================================
BUG: KMSAN: uninit-value in pick_link+0xd8c/0x1690 fs/namei.c:1850
pick_link+0xd8c/0x1690 fs/namei.c:1850
step_into+0x156f/0x1640 fs/namei.c:1909
open_last_lookups fs/namei.c:3674 [inline]
path_openat+0x39da/0x6100 fs/namei.c:3883
do_filp_open+0x20e/0x590 fs/namei.c:3913
do_sys_openat2+0x1bf/0x2f0 fs/open.c:1416
do_sys_open fs/open.c:1431 [inline]
__do_sys_openat fs/open.c:1447 [inline]
__se_sys_openat fs/open.c:1442 [inline]
__x64_sys_openat+0x2a1/0x310 fs/open.c:1442
x64_sys_call+0x1fe/0x3c10 arch/x86/include/generated/asm/syscalls_64.h:258
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
Uninit was created at:
__alloc_pages_noprof+0x9d6/0xe70 mm/page_alloc.c:4719
alloc_pages_mpol_noprof+0x299/0x990 mm/mempolicy.c:2263
alloc_pages_noprof mm/mempolicy.c:2343 [inline]
folio_alloc_noprof+0x1db/0x310 mm/mempolicy.c:2350
filemap_alloc_folio_noprof+0xa6/0x440 mm/filemap.c:1008
do_read_cache_folio+0x11e/0x1260 mm/filemap.c:3753
do_read_cache_page mm/filemap.c:3857 [inline]
read_cache_page+0x63/0x1d0 mm/filemap.c:3866
read_mapping_page include/linux/pagemap.h:907 [inline]
page_get_link+0x76/0xf90 fs/namei.c:5272
pick_link+0xd6c/0x1690
step_into+0x156f/0x1640 fs/namei.c:1909
open_last_lookups fs/namei.c:3674 [inline]
path_openat+0x39da/0x6100 fs/namei.c:3883
do_filp_open+0x20e/0x590 fs/namei.c:3913
do_sys_openat2+0x1bf/0x2f0 fs/open.c:1416
do_sys_open fs/open.c:1431 [inline]
__do_sys_openat fs/open.c:1447 [inline]
__se_sys_openat fs/open.c:1442 [inline]
__x64_sys_openat+0x2a1/0x310 fs/open.c:1442
x64_sys_call+0x1fe/0x3c10 arch/x86/include/generated/asm/syscalls_64.h:258
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
CPU: 1 UID: 0 PID: 5944 Comm: syz.0.15 Not tainted 6.10.0-syzkaller-12708-g2f8c4f506285-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024
=====================================================
Tested on:
commit: 2f8c4f50 Merge tag 'auxdisplay-for-v6.11-tag1' of git:..
git tree: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
console output: https://syzkaller.appspot.com/x/log.txt?x=126e41a1980000
kernel config: https://syzkaller.appspot.com/x/.config?x=ea3a063e5f96c3d6
dashboard link: https://syzkaller.appspot.com/bug?extid=24ac24ff58dc5b0d26b9
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
patch: https://syzkaller.appspot.com/x/patch.diff?x=16a51be3980000
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