[moderation] [block?] KCSAN: data-race in data_push_tail / number (4)

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 3b47bc037bd4 Merge tag 'pinctrl-v6.7-2' of git://git.kerne..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1180c364e80000
kernel config: https://syzkaller.appspot.com/x/.config?x=585869067cd7ce59
dashboard link: https://syzkaller.appspot.com/bug?extid=eeb6cc68c766a7407715
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
CC: [da...@davemloft.net edum...@google.com ku...@kernel.org linux...@vger.kernel.org linux-...@vger.kernel.org net...@vger.kernel.org pab...@redhat.com]

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

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/231e21487056/disk-3b47bc03.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/eae871bb6b73/vmlinux-3b47bc03.xz
kernel image: https://storage.googleapis.com/syzbot-assets/0c20f8f08d47/bzImage-3b47bc03.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+eeb6cc...@syzkaller.appspotmail.com

lo speed is unknown, defaulting to 1000
==================================================================
BUG: KCSAN: data-race in data_push_tail / number

write to 0xffffffff86edaf0b of 1 bytes by task 7405 on cpu 1:
number+0x7d0/0xa90 lib/vsprintf.c:564
vsnprintf+0xa44/0xe20 lib/vsprintf.c:2885
vscnprintf+0x42/0x80 lib/vsprintf.c:2925
printk_sprint+0x30/0x2d0 kernel/printk/printk.c:2124
vprintk_store+0x56f/0x800 kernel/printk/printk.c:2238
vprintk_emit+0xd0/0x5d0 kernel/printk/printk.c:2284
vprintk_default+0x26/0x30 kernel/printk/printk.c:2318
vprintk+0x71/0x80 kernel/printk/printk_safe.c:45
_printk+0x7a/0xa0 kernel/printk/printk.c:2328
__nla_validate_parse+0x1768/0x1d00 lib/nlattr.c:643
__nla_parse+0x40/0x50 lib/nlattr.c:728
__nlmsg_parse include/net/netlink.h:756 [inline]
nlmsg_parse_deprecated include/net/netlink.h:797 [inline]
__rtnl_newlink net/core/rtnetlink.c:3586 [inline]
rtnl_newlink+0x1b7/0x1670 net/core/rtnetlink.c:3754
rtnetlink_rcv_msg+0x807/0x8c0 net/core/rtnetlink.c:6558
netlink_rcv_skb+0x126/0x220 net/netlink/af_netlink.c:2545
rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:6576
netlink_unicast_kernel net/netlink/af_netlink.c:1342 [inline]
netlink_unicast+0x589/0x650 net/netlink/af_netlink.c:1368
netlink_sendmsg+0x66e/0x770 net/netlink/af_netlink.c:1910
sock_sendmsg_nosec net/socket.c:730 [inline]
__sock_sendmsg net/socket.c:745 [inline]
____sys_sendmsg+0x37c/0x4d0 net/socket.c:2584
___sys_sendmsg net/socket.c:2638 [inline]
__sys_sendmsg+0x1e9/0x270 net/socket.c:2667
__do_sys_sendmsg net/socket.c:2676 [inline]
__se_sys_sendmsg net/socket.c:2674 [inline]
__x64_sys_sendmsg+0x46/0x50 net/socket.c:2674
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x44/0x110 arch/x86/entry/common.c:82
entry_SYSCALL_64_after_hwframe+0x63/0x6b

read to 0xffffffff86edaf08 of 8 bytes by task 7397 on cpu 0:
data_make_reusable kernel/printk/printk_ringbuffer.c:590 [inline]
data_push_tail+0x102/0x430 kernel/printk/printk_ringbuffer.c:675
data_alloc+0xbe/0x2c0 kernel/printk/printk_ringbuffer.c:1046
prb_reserve+0x893/0xbc0 kernel/printk/printk_ringbuffer.c:1555
vprintk_store+0x53e/0x800 kernel/printk/printk.c:2228
vprintk_emit+0xd0/0x5d0 kernel/printk/printk.c:2284
vprintk_default+0x26/0x30 kernel/printk/printk.c:2318
vprintk+0x71/0x80 kernel/printk/printk_safe.c:45
_printk+0x7a/0xa0 kernel/printk/printk.c:2328
ib_get_eth_speed+0x318/0x490 drivers/infiniband/core/verbs.c:1994
siw_query_port+0x3d/0x250 drivers/infiniband/sw/siw/siw_verbs.c:173
iw_query_port drivers/infiniband/core/device.c:2049 [inline]
ib_query_port+0x361/0x3a0 drivers/infiniband/core/device.c:2090
ib_setup_port_attrs+0x148/0x1320 drivers/infiniband/core/sysfs.c:1440
add_one_compat_dev+0x2e6/0x3e0 drivers/infiniband/core/device.c:969
rdma_dev_init_net+0x17f/0x210 drivers/infiniband/core/device.c:1185
ops_init+0x1fc/0x2c0 net/core/net_namespace.c:136
setup_net+0x2cd/0x710 net/core/net_namespace.c:339
copy_net_ns+0x384/0x520 net/core/net_namespace.c:491
create_new_namespaces+0x228/0x430 kernel/nsproxy.c:110
copy_namespaces+0x1a9/0x200 kernel/nsproxy.c:179
copy_process+0x1029/0x20a0 kernel/fork.c:2505
kernel_clone+0x169/0x560 kernel/fork.c:2907
__do_sys_clone kernel/fork.c:3050 [inline]
__se_sys_clone kernel/fork.c:3034 [inline]
__x64_sys_clone+0xe8/0x120 kernel/fork.c:3034
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x44/0x110 arch/x86/entry/common.c:82
entry_SYSCALL_64_after_hwframe+0x63/0x6b

value changed: 0x0000000100007674 -> 0x6574796220383620

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 7397 Comm: syz-executor.5 Not tainted 6.7.0-rc3-syzkaller-00033-g3b47bc037bd4 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023
==================================================================


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