Hello,
syzbot found the following issue on:
HEAD commit: d8ec19857b09 Merge tag 'net-6.10-rc2' of git://git.kernel...
git tree: upstream
console output:
https://syzkaller.appspot.com/x/log.txt?x=1760a906980000
kernel config:
https://syzkaller.appspot.com/x/.config?x=b639694183430f97
dashboard link:
https://syzkaller.appspot.com/bug?extid=933518e92e153308d4e0
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
CC: [
j.gra...@samsung.com kees...@chromium.org linux-...@vger.kernel.org linux-...@vger.kernel.org mcg...@kernel.org]
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image:
https://storage.googleapis.com/syzbot-assets/4c525cb10506/disk-d8ec1985.raw.xz
vmlinux:
https://storage.googleapis.com/syzbot-assets/5d3c75ffceb2/vmlinux-d8ec1985.xz
kernel image:
https://storage.googleapis.com/syzbot-assets/5a992c1884ee/bzImage-d8ec1985.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by:
syzbot+933518...@syzkaller.appspotmail.com
==================================================================
BUG: KCSAN: data-race in __d_rehash / fast_dput
write to 0xffff8881006566d0 of 8 bytes by task 3110 on cpu 1:
hlist_bl_add_head_rcu include/linux/rculist_bl.h:81 [inline]
__d_rehash+0xc4/0x220 fs/dcache.c:2403
__d_add+0x36d/0x4a0 fs/dcache.c:2618
d_splice_alias+0xd6/0x270 fs/dcache.c:3009
proc_sys_lookup+0x386/0x440 fs/proc/proc_sysctl.c:536
lookup_open fs/namei.c:3483 [inline]
open_last_lookups fs/namei.c:3574 [inline]
path_openat+0xc85/0x1da0 fs/namei.c:3804
do_filp_open+0xf7/0x200 fs/namei.c:3834
do_sys_openat2+0xab/0x120 fs/open.c:1405
do_sys_open fs/open.c:1420 [inline]
__do_sys_openat fs/open.c:1436 [inline]
__se_sys_openat fs/open.c:1431 [inline]
__x64_sys_openat+0xf3/0x120 fs/open.c:1431
x64_sys_call+0x1057/0x2d70 arch/x86/include/generated/asm/syscalls_64.h:258
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
read to 0xffff8881006566d0 of 8 bytes by task 3109 on cpu 0:
hlist_bl_unhashed include/linux/list_bl.h:54 [inline]
d_unhashed include/linux/dcache.h:347 [inline]
retain_dentry fs/dcache.c:686 [inline]
fast_dput+0xcf/0x2b0 fs/dcache.c:799
dput+0x24/0xd0 fs/dcache.c:839
__fput+0x448/0x660 fs/file_table.c:430
__fput_sync+0x44/0x60 fs/file_table.c:507
__do_sys_close fs/open.c:1555 [inline]
__se_sys_close+0x101/0x1b0 fs/open.c:1540
__x64_sys_close+0x1f/0x30 fs/open.c:1540
x64_sys_call+0x25f1/0x2d70 arch/x86/include/generated/asm/syscalls_64.h:4
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
value changed: 0xffff888237532488 -> 0xffff888107c48a88
Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 3109 Comm: syz-executor.4 Not tainted 6.10.0-rc1-syzkaller-00104-gd8ec19857b09 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
==================================================================
---
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