From: syzbot <syzbot+f682b67a78ce05867e78@syzkaller.appspotmail.com>
To: akpm@linux-foundation.org, hughd@google.com,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
syzkaller-bugs@googlegroups.com
Subject: [syzbot] [mm?] KCSAN: data-race in generic_fillattr / shmem_unlink (3)
Date: Mon, 24 Apr 2023 01:10:43 -0700 [thread overview]
Message-ID: <0000000000001db82205fa108b35@google.com> (raw)
Hello,
syzbot found the following issue on:
HEAD commit: cb0856346a60 Merge tag 'mm-hotfixes-stable-2023-04-19-16-3..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=10b9e8bfc80000
kernel config: https://syzkaller.appspot.com/x/.config?x=fa4baf7c6b35b5d5
dashboard link: https://syzkaller.appspot.com/bug?extid=f682b67a78ce05867e78
compiler: Debian clang version 15.0.7, GNU ld (GNU Binutils for Debian) 2.35.2
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/a02dd7789fb2/disk-cb085634.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/a1a1eac454f6/vmlinux-cb085634.xz
kernel image: https://storage.googleapis.com/syzbot-assets/bb0447014913/bzImage-cb085634.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+f682b67a78ce05867e78@syzkaller.appspotmail.com
==================================================================
BUG: KCSAN: data-race in generic_fillattr / shmem_unlink
read-write to 0xffff888104d167b8 of 8 bytes by task 23887 on cpu 1:
shmem_unlink+0x102/0x190 mm/shmem.c:3036
vfs_unlink+0x261/0x3e0 fs/namei.c:4250
do_unlinkat+0x266/0x4f0 fs/namei.c:4316
__do_sys_unlink fs/namei.c:4364 [inline]
__se_sys_unlink fs/namei.c:4362 [inline]
__x64_sys_unlink+0x30/0x40 fs/namei.c:4362
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
read to 0xffff888104d167b8 of 8 bytes by task 27823 on cpu 0:
i_size_read include/linux/fs.h:866 [inline]
generic_fillattr+0x13f/0x1e0 fs/stat.c:58
shmem_getattr+0x32a/0x3b0 mm/shmem.c:1068
vfs_getattr_nosec+0x1e3/0x3c0 fs/stat.c:133
vfs_getattr fs/stat.c:170 [inline]
vfs_statx+0x156/0x300 fs/stat.c:242
vfs_fstatat fs/stat.c:276 [inline]
__do_sys_newfstatat fs/stat.c:446 [inline]
__se_sys_newfstatat+0x8a/0x2a0 fs/stat.c:440
__x64_sys_newfstatat+0x55/0x60 fs/stat.c:440
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
value changed: 0x00000000000000c8 -> 0x00000000000000b4
Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 27823 Comm: udevd Not tainted 6.3.0-rc7-syzkaller-00089-gcb0856346a60 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/30/2023
==================================================================
---
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next reply other threads:[~2023-04-24 8:10 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-04-24 8:10 syzbot [this message]
2023-04-24 8:28 ` [syzbot] [mm?] KCSAN: data-race in generic_fillattr / shmem_unlink (3) Dmitry Vyukov
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