Hello, syzbot found the following issue on: HEAD commit: 99fa936e8e4f Merge tag 'affs-6.14-rc5-tag' of git://git.ke.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=14629464580000 kernel config: https://syzkaller.appspot.com/x/.config?x=523b0e2f15224775 dashboard link: https://syzkaller.appspot.com/bug?extid=efe683d57990864b8c8e 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/a28c1cb92a01/disk-99fa936e.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/229349d043c8/vmlinux-99fa936e.xz kernel image: https://storage.googleapis.com/syzbot-assets/49768322c46d/bzImage-99fa936e.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+efe683d57990864b8c8e@xxxxxxxxxxxxxxxxxxxxxxxxx ================================================================== BUG: KCSAN: data-race in virtqueue_disable_cb / virtqueue_enable_cb_delayed write to 0xffff8881025bc452 of 1 bytes by task 3288 on cpu 0: virtqueue_enable_cb_delayed+0x42/0x3c0 drivers/virtio/virtio_ring.c:2653 start_xmit+0x230/0x1310 drivers/net/virtio_net.c:3264 __netdev_start_xmit include/linux/netdevice.h:5151 [inline] netdev_start_xmit include/linux/netdevice.h:5160 [inline] xmit_one net/core/dev.c:3800 [inline] dev_hard_start_xmit+0x119/0x3f0 net/core/dev.c:3816 sch_direct_xmit+0x1a9/0x580 net/sched/sch_generic.c:343 __dev_xmit_skb net/core/dev.c:4039 [inline] __dev_queue_xmit+0xf6a/0x2090 net/core/dev.c:4615 dev_queue_xmit include/linux/netdevice.h:3313 [inline] neigh_hh_output include/net/neighbour.h:523 [inline] neigh_output include/net/neighbour.h:537 [inline] ip_finish_output2+0x71d/0x880 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:459 [inline] ip_local_out net/ipv4/ip_output.c:130 [inline] __ip_queue_xmit+0xb2c/0xb50 net/ipv4/ip_output.c:528 ip_queue_xmit+0x38/0x50 net/ipv4/ip_output.c:542 __tcp_transmit_skb+0x15ca/0x19d0 net/ipv4/tcp_output.c:1471 tcp_transmit_skb net/ipv4/tcp_output.c:1489 [inline] tcp_write_xmit+0x1217/0x3020 net/ipv4/tcp_output.c:2832 __tcp_push_pending_frames+0x6a/0x1a0 net/ipv4/tcp_output.c:3015 tcp_push+0x320/0x340 net/ipv4/tcp.c:751 tcp_sendmsg_locked+0x21a1/0x26a0 net/ipv4/tcp.c:1326 tcp_sendmsg+0x30/0x50 net/ipv4/tcp.c:1358 inet_sendmsg+0x77/0xd0 net/ipv4/af_inet.c:851 sock_sendmsg_nosec net/socket.c:718 [inline] __sock_sendmsg+0x102/0x180 net/socket.c:733 sock_write_iter+0x15e/0x1a0 net/socket.c:1137 new_sync_write fs/read_write.c:586 [inline] vfs_write+0x77b/0x920 fs/read_write.c:679 ksys_write+0xe8/0x1b0 fs/read_write.c:731 __do_sys_write fs/read_write.c:742 [inline] __se_sys_write fs/read_write.c:739 [inline] __x64_sys_write+0x42/0x50 fs/read_write.c:739 x64_sys_call+0x287e/0x2dc0 arch/x86/include/generated/asm/syscalls_64.h:2 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 0xffff8881025bc452 of 1 bytes by interrupt on cpu 1: virtqueue_disable_cb_split drivers/virtio/virtio_ring.c:880 [inline] virtqueue_disable_cb+0x92/0x180 drivers/virtio/virtio_ring.c:2566 skb_xmit_done+0x5f/0x140 drivers/net/virtio_net.c:777 vring_interrupt+0x161/0x190 drivers/virtio/virtio_ring.c:2715 __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:249 [inline] call_irq_handler arch/x86/kernel/irq.c:261 [inline] __common_interrupt+0x58/0xe0 arch/x86/kernel/irq.c:287 common_interrupt+0x7c/0x90 arch/x86/kernel/irq.c:280 asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:693 rep_movs_alternative+0x33/0x70 arch/x86/lib/copy_user_64.S:57 copy_user_generic arch/x86/include/asm/uaccess_64.h:126 [inline] raw_copy_from_user arch/x86/include/asm/uaccess_64.h:141 [inline] _inline_copy_from_user include/linux/uaccess.h:178 [inline] _copy_from_user+0x6f/0xa0 lib/usercopy.c:18 copy_from_user include/linux/uaccess.h:212 [inline] copy_msghdr_from_user+0x54/0x2a0 net/socket.c:2503 recvmsg_copy_msghdr net/socket.c:2759 [inline] ___sys_recvmsg net/socket.c:2831 [inline] do_recvmmsg+0x256/0x6d0 net/socket.c:2930 __sys_recvmmsg net/socket.c:3004 [inline] __do_sys_recvmmsg net/socket.c:3027 [inline] __se_sys_recvmmsg net/socket.c:3020 [inline] __x64_sys_recvmmsg+0xe2/0x170 net/socket.c:3020 x64_sys_call+0x2a9a/0x2dc0 arch/x86/include/generated/asm/syscalls_64.h:300 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: 0x01 -> 0x00 Reported by Kernel Concurrency Sanitizer on: CPU: 1 UID: 0 PID: 4167 Comm: syz.0.259 Not tainted 6.14.0-rc5-syzkaller-00013-g99fa936e8e4f #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 ================================================================== --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
