tun: limit printing rate when illegal packet received by tun dev
vhost_worker will call tun call backs to receive packets. If too many
illegal packets arrives, tun_do_read will keep dumping packet contents.
When console is enabled, it will costs much more cpu time to dump
packet and soft lockup will be detected.
net_ratelimit mechanism can be used to limit the dumping rate.
PID: 33036 TASK:
ffff949da6f20000 CPU: 23 COMMAND: "vhost-32980"
#0 [
fffffe00003fce50] crash_nmi_callback at
ffffffff89249253
#1 [
fffffe00003fce58] nmi_handle at
ffffffff89225fa3
#2 [
fffffe00003fceb0] default_do_nmi at
ffffffff8922642e
#3 [
fffffe00003fced0] do_nmi at
ffffffff8922660d
#4 [
fffffe00003fcef0] end_repeat_nmi at
ffffffff89c01663
[exception RIP: io_serial_in+20]
RIP:
ffffffff89792594 RSP:
ffffa655314979e8 RFLAGS:
00000002
RAX:
ffffffff89792500 RBX:
ffffffff8af428a0 RCX:
0000000000000000
RDX:
00000000000003fd RSI:
0000000000000005 RDI:
ffffffff8af428a0
RBP:
0000000000002710 R8:
0000000000000004 R9:
000000000000000f
R10:
0000000000000000 R11:
ffffffff8acbf64f R12:
0000000000000020
R13:
ffffffff8acbf698 R14:
0000000000000058 R15:
0000000000000000
ORIG_RAX:
ffffffffffffffff CS: 0010 SS: 0018
#5 [
ffffa655314979e8] io_serial_in at
ffffffff89792594
#6 [
ffffa655314979e8] wait_for_xmitr at
ffffffff89793470
#7 [
ffffa65531497a08] serial8250_console_putchar at
ffffffff897934f6
#8 [
ffffa65531497a20] uart_console_write at
ffffffff8978b605
#9 [
ffffa65531497a48] serial8250_console_write at
ffffffff89796558
#10 [
ffffa65531497ac8] console_unlock at
ffffffff89316124
#11 [
ffffa65531497b10] vprintk_emit at
ffffffff89317c07
#12 [
ffffa65531497b68] printk at
ffffffff89318306
#13 [
ffffa65531497bc8] print_hex_dump at
ffffffff89650765
#14 [
ffffa65531497ca8] tun_do_read at
ffffffffc0b06c27 [tun]
#15 [
ffffa65531497d38] tun_recvmsg at
ffffffffc0b06e34 [tun]
#16 [
ffffa65531497d68] handle_rx at
ffffffffc0c5d682 [vhost_net]
#17 [
ffffa65531497ed0] vhost_worker at
ffffffffc0c644dc [vhost]
#18 [
ffffa65531497f10] kthread at
ffffffff892d2e72
#19 [
ffffa65531497f50] ret_from_fork at
ffffffff89c0022f
Fixes: ef3db4a59542 ("tun: avoid BUG, dump packet on GSO errors")
Signed-off-by: Lei Chen <lei.chen@smartx.com>
Reviewed-by: Willem de Bruijn <willemb@google.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Link: https://lore.kernel.org/r/20240415020247.2207781-1-lei.chen@smartx.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>