Message-ID: <67177961.050a0220.1e4b4d.0073.GAE@google.com>
Date: Tue, 22 Oct 2024 03:07:29 -0700
From: syzbot <syzbot+9d46c74b27b961b244a9@...kaller.appspotmail.com>
To: eperezma@...hat.com, jasowang@...hat.com, linux-kernel@...r.kernel.org, 
	mst@...hat.com, syzkaller-bugs@...glegroups.com, 
	virtualization@...ts.linux.dev, xuanzhuo@...ux.alibaba.com
Subject: [syzbot] [virt?] KCSAN: data-race in virtqueue_disable_cb /
 virtqueue_disable_cb (5)

Hello,

syzbot found the following issue on:

HEAD commit:    3d5ad2d4eca3 Merge tag 'bpf-fixes' of git://git.kernel.org..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=154b7487980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=fd83253b74c9c570
dashboard link: https://syzkaller.appspot.com/bug?extid=9d46c74b27b961b244a9
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40

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

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/9d112e37e26b/disk-3d5ad2d4.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/d8f036bdcdb7/vmlinux-3d5ad2d4.xz
kernel image: https://storage.googleapis.com/syzbot-assets/61727d52db48/bzImage-3d5ad2d4.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+9d46c74b27b961b244a9@...kaller.appspotmail.com

==================================================================
BUG: KCSAN: data-race in virtqueue_disable_cb / virtqueue_disable_cb

read to 0xffff888102c18178 of 2 bytes by interrupt on cpu 1:
 virtqueue_disable_cb_split drivers/virtio/virtio_ring.c:885 [inline]
 virtqueue_disable_cb+0x63/0x180 drivers/virtio/virtio_ring.c:2446
 skb_xmit_done+0x5f/0x140 drivers/net/virtio_net.c:715
 vring_interrupt+0x161/0x190 drivers/virtio/virtio_ring.c:2595
 __handle_irq_event_percpu+0x95/0x490 kernel/irq/handle.c:158
 handle_irq_event_percpu kernel/irq/handle.c:193 [inline]
 handle_irq_event+0x64/0xf0 kernel/irq/handle.c:210
 handle_edge_irq+0x16d/0x5b0 kernel/irq/chip.c:831
 generic_handle_irq_desc include/linux/irqdesc.h:173 [inline]
 handle_irq arch/x86/kernel/irq.c:247 [inline]
 call_irq_handler arch/x86/kernel/irq.c:259 [inline]
 __common_interrupt+0x58/0xe0 arch/x86/kernel/irq.c:285
 common_interrupt+0x7c/0x90 arch/x86/kernel/irq.c:278
 asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:693
 kcsan_setup_watchpoint+0x404/0x410 kernel/kcsan/core.c:705
 format_decode+0x1d1/0x8a0 lib/vsprintf.c:2554
 vsnprintf+0xc6/0xe30 lib/vsprintf.c:2755
 sprintf+0x89/0xb0 lib/vsprintf.c:3007
 print_caller kernel/printk/printk.c:1373 [inline]
 info_print_prefix+0x142/0x1a0 kernel/printk/printk.c:1390
 record_print_text kernel/printk/printk.c:1437 [inline]
 printk_get_next_message+0x446/0x6f0 kernel/printk/printk.c:2978
 console_emit_next_record kernel/printk/printk.c:3046 [inline]
 console_flush_all+0x28a/0x770 kernel/printk/printk.c:3180
 __console_flush_and_unlock kernel/printk/printk.c:3239 [inline]
 console_unlock+0xab/0x330 kernel/printk/printk.c:3279
 vprintk_emit+0x3f4/0x680 kernel/printk/printk.c:2407
 vprintk_default+0x26/0x30 kernel/printk/printk.c:2422
 vprintk+0x75/0x80 kernel/printk/printk_safe.c:68
 _printk+0x7a/0xa0 kernel/printk/printk.c:2432
 batadv_check_known_mac_addr+0x153/0x180 net/batman-adv/hard-interface.c:528
 batadv_hard_if_event+0x4b0/0x1010 net/batman-adv/hard-interface.c:998
 notifier_call_chain kernel/notifier.c:93 [inline]
 raw_notifier_call_chain+0x6f/0x1d0 kernel/notifier.c:461
 call_netdevice_notifiers_info+0xae/0x100 net/core/dev.c:1996
 call_netdevice_notifiers_extack net/core/dev.c:2034 [inline]
 call_netdevice_notifiers net/core/dev.c:2048 [inline]
 dev_set_mac_address+0x1ff/0x260 net/core/dev.c:9104
 dev_set_mac_address_user+0x31/0x50 net/core/dev.c:9118
 do_setlink+0x513/0x2490 net/core/rtnetlink.c:2884
 __rtnl_newlink net/core/rtnetlink.c:3725 [inline]
 rtnl_newlink+0x11a3/0x1690 net/core/rtnetlink.c:3772
 rtnetlink_rcv_msg+0x6aa/0x710 net/core/rtnetlink.c:6675
 netlink_rcv_skb+0x12c/0x230 net/netlink/af_netlink.c:2551
 rtnetlink_rcv+0x1c/0x30 net/core/rtnetlink.c:6693
 netlink_unicast_kernel net/netlink/af_netlink.c:1331 [inline]
 netlink_unicast+0x599/0x670 net/netlink/af_netlink.c:1357
 netlink_sendmsg+0x5cc/0x6e0 net/netlink/af_netlink.c:1901
 sock_sendmsg_nosec net/socket.c:729 [inline]
 __sock_sendmsg+0x140/0x180 net/socket.c:744
 __sys_sendto+0x1d6/0x260 net/socket.c:2214
 __do_sys_sendto net/socket.c:2226 [inline]
 __se_sys_sendto net/socket.c:2222 [inline]
 __x64_sys_sendto+0x78/0x90 net/socket.c:2222
 x64_sys_call+0x2959/0x2d60 arch/x86/include/generated/asm/syscalls_64.h:45
 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

write to 0xffff888102c18178 of 2 bytes by task 3255 on cpu 0:
 virtqueue_disable_cb_split drivers/virtio/virtio_ring.c:886 [inline]
 virtqueue_disable_cb+0x85/0x180 drivers/virtio/virtio_ring.c:2446
 start_xmit+0x14b/0x1260 drivers/net/virtio_net.c:3067
 __netdev_start_xmit include/linux/netdevice.h:4916 [inline]
 netdev_start_xmit include/linux/netdevice.h:4925 [inline]
 xmit_one net/core/dev.c:3588 [inline]
 dev_hard_start_xmit+0x119/0x3f0 net/core/dev.c:3604
 sch_direct_xmit+0x1a9/0x580 net/sched/sch_generic.c:343
 __dev_xmit_skb net/core/dev.c:3821 [inline]
 __dev_queue_xmit+0xf1a/0x2040 net/core/dev.c:4394
 dev_queue_xmit include/linux/netdevice.h:3094 [inline]
 neigh_hh_output include/net/neighbour.h:526 [inline]
 neigh_output include/net/neighbour.h:540 [inline]
 ip_finish_output2+0x73d/0x8b0 net/ipv4/ip_output.c:236
 ip_finish_output+0x11a/0x2a0 net/ipv4/ip_output.c:324
 NF_HOOK_COND include/linux/netfilter.h:303 [inline]
 ip_output+0xab/0x170 net/ipv4/ip_output.c:434
 dst_output include/net/dst.h:450 [inline]
 ip_local_out net/ipv4/ip_output.c:130 [inline]
 __ip_queue_xmit+0xbcc/0xbf0 net/ipv4/ip_output.c:536
 ip_queue_xmit+0x38/0x50 net/ipv4/ip_output.c:550
 __tcp_transmit_skb+0x15b0/0x1970 net/ipv4/tcp_output.c:1466
 __tcp_send_ack+0x1de/0x2e0 net/ipv4/tcp_output.c:4268
 tcp_send_ack+0x27/0x30 net/ipv4/tcp_output.c:4274
 __tcp_cleanup_rbuf+0x149/0x280 net/ipv4/tcp.c:1505
 tcp_cleanup_rbuf net/ipv4/tcp.c:1516 [inline]
 tcp_recvmsg_locked+0x1be3/0x2100 net/ipv4/tcp.c:2821
 tcp_recvmsg+0x13c/0x490 net/ipv4/tcp.c:2851
 inet_recvmsg+0xbd/0x290 net/ipv4/af_inet.c:885
 sock_recvmsg_nosec net/socket.c:1051 [inline]
 sock_recvmsg+0xfe/0x170 net/socket.c:1073
 sock_read_iter+0x14c/0x1a0 net/socket.c:1143
 new_sync_read fs/read_write.c:488 [inline]
 vfs_read+0x5f6/0x720 fs/read_write.c:569
 ksys_read+0xeb/0x1b0 fs/read_write.c:712
 __do_sys_read fs/read_write.c:722 [inline]
 __se_sys_read fs/read_write.c:720 [inline]
 __x64_sys_read+0x42/0x50 fs/read_write.c:720
 x64_sys_call+0x27d3/0x2d60 arch/x86/include/generated/asm/syscalls_64.h:1
 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: 0x0000 -> 0x0001

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 3255 Comm: syz-executor Not tainted 6.12.0-rc3-syzkaller-00389-g3d5ad2d4eca3 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
==================================================================


---
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