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SubjectRe: BNX2: Kernel crashes with 2.6.31 and 2.6.31.9
Brian Haley wrote:
> Hi Michael,
>
> Michael Chan wrote:
>> Do we have timers running in this environment? The timer in the bnx2
>> driver, bnx2_timer(), needs to run to provide a heart beat to the
>> firmware. In netpoll mode without timer interrupts, if we are regularly
>> calling the NAPI poll function, it should also be able to provide the
>> heartbeat. Without the heartbeat, the firmware will reset the chip and
>> result in the NETDEV WATCHDOG.
>
> We have also been seeing watchdog timeouts with bnx2, below is a
> stack trace with Benjamin's debug patch applied. Normally we were
> only seeing them under heavy load, but this one was at boot. We haven't
> tried the latest firmware/driver from 2.6.33 yet. You can contact me
> offline if you need more detailed info.

Following-up since I have more info on this issue.

I'm able to cause a netdev_watchdog timeout by changing the coalesce
settings on my bnx2, I built a little test program for it:

#include <stdio.h>
#include <stdlib.h>
#include <strings.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <linux/if.h>
#include <linux/ethtool.h>
#include <linux/sockios.h>

main()
{
struct ifreq ifr;
struct ethtool_coalesce ecoal;
int fd, err;
int sleeptime = 5;
char *ifname = "eth0";

fd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
if (fd < 0) {
perror("socket");
exit(1);
}

bzero(&ifr, sizeof(ifr));
bcopy(ifname, ifr.ifr_name, sizeof(ifname));

bzero(&ecoal, sizeof(ecoal));

printf("Running ETHTOOL_GCOALESCE on %s\n", ifname);
ecoal.cmd = ETHTOOL_GCOALESCE;
ifr.ifr_data = (caddr_t)&ecoal;
err = ioctl(fd, SIOCETHTOOL, &ifr);
if (err)
perror("ETHTOOL_GCOALESCE");
printf("Sleeping %d seconds\n", sleeptime);
sleep(sleeptime);

ecoal.rx_coalesce_usecs = 0;
ecoal.rx_max_coalesced_frames = 1;
ecoal.rx_coalesce_usecs_irq = 0;
ecoal.rx_max_coalesced_frames_irq = 1;

printf("Setting ETHTOOL_SCOALESCE on %s\n", ifname);
ecoal.cmd = ETHTOOL_SCOALESCE;
ifr.ifr_data = (caddr_t)&ecoal;
err = ioctl(fd, SIOCETHTOOL, &ifr);
if (err)
perror("ETHTOOL_SCOALESCE");
}

[ 2.428093] bnx2 0000:04:00.0: firmware: requesting bnx2/bnx2-rv2p-06-5.0.0.j3.fw
[ 2.432526] eth0: Broadcom NetXtreme II BCM5708 1000Base-T (B2) PCI-X 64-bit 133MHz found at mem f6000000, IRQ 41, node addr 00:1c:c4:e1:cc:ea
[ 2.439520] bnx2 0000:42:00.0: PCI INT A -> GSI 34 (level, low) -> IRQ 34

lspci shows this is a HP 373i, it's the onboard NIC.

Running this on one particular system I get:

Mar 10 07:48:58 N1002563 kernel: [ 870.780023] ------------[ cut here ]------------
Mar 10 07:48:58 N1002563 kernel: [ 870.780037] WARNING: at net/sched/sch_generic.c:261 dev_watchdog+0x12d/0x1d5()
Mar 10 07:48:58 N1002563 kernel: [ 870.780041] Hardware name: ProLiant DL385 G5
Mar 10 07:48:58 N1002563 kernel: [ 870.780046] NETDEV WATCHDOG: eth0 (bnx2): transmit queue 0 timed out
Mar 10 07:48:58 N1002563 kernel: [ 870.780050] Modules linked in: mptctl ipmi_devintf deflate zlib_deflate ctr twofish twofish_common camellia serpent blowfish cast5 des_generic cbc cryptd aes_x86_64 aes_generic xcbc rmd160 sha256_generic sha1_generic crypto_null af_key sg bonding sctp crc32c libcrc32c loop psmouse serio_raw container amd64_edac_mod edac_core i2c_piix4 shpchp pci_hotplug ipmi_si i2c_core ipmi_msghandler hpilo processor evdev ext3 jbd mbcache sd_mod crc_t10dif usbhid hid ata_generic libata ide_pci_generic e1000e bnx2 mptsas mptscsih mptbase serverworks scsi_transport_sas ide_core ehci_hcd scsi_mod ohci_hcd uhci_hcd button thermal fan thermal_sys edd [last unloaded: scsi_wait_scan]
Mar 10 07:48:58 N1002563 kernel: [ 870.780133] Pid: 0, comm: swapper Not tainted 2.6.32-clim-4-amd64 #1
Mar 10 07:48:58 N1002563 kernel: [ 870.780137] Call Trace:
Mar 10 07:48:58 N1002563 kernel: [ 870.780141] <IRQ> [<ffffffff812697a0>] ? dev_watchdog+0x12d/0x1d5
Mar 10 07:48:58 N1002563 kernel: [ 870.780156] [<ffffffff81049914>] warn_slowpath_common+0x77/0xa4
Mar 10 07:48:58 N1002563 kernel: [ 870.780170] [<ffffffff810499b6>] warn_slowpath_fmt+0x64/0x66
Mar 10 07:48:58 N1002563 kernel: [ 870.780177] [<ffffffff81045df7>] ? default_wake_function+0xd/0xf
Mar 10 07:48:58 N1002563 kernel: [ 870.780184] [<ffffffff81035fa7>] ? __wake_up_common+0x46/0x76
Mar 10 07:48:58 N1002563 kernel: [ 870.780191] [<ffffffff8103b414>] ? __wake_up+0x43/0x50
Mar 10 07:48:58 N1002563 kernel: [ 870.780198] [<ffffffff81253829>] ? netdev_drivername+0x43/0x4b
Mar 10 07:48:58 N1002563 kernel: [ 870.780204] [<ffffffff812697a0>] dev_watchdog+0x12d/0x1d5
Mar 10 07:48:58 N1002563 kernel: [ 870.780214] [<ffffffff8105e84a>] ? delayed_work_timer_fn+0x0/0x3d
Mar 10 07:48:58 N1002563 kernel: [ 870.780219] [<ffffffff8105e7ee>] ? __queue_work+0x35/0x3d
Mar 10 07:48:58 N1002563 kernel: [ 870.780227] [<ffffffff81269673>] ? dev_watchdog+0x0/0x1d5
Mar 10 07:48:58 N1002563 kernel: [ 870.780234] [<ffffffff8105655a>] run_timer_softirq+0x1ff/0x2a1
Mar 10 07:48:58 N1002563 kernel: [ 870.780242] [<ffffffff810205a1>] ? lapic_next_event+0x18/0x1c
Mar 10 07:48:58 N1002563 kernel: [ 870.780249] [<ffffffff8104f9e3>] __do_softirq+0xde/0x19f
Mar 10 07:48:58 N1002563 kernel: [ 870.780256] [<ffffffff8100ccec>] call_softirq+0x1c/0x28
Mar 10 07:48:58 N1002563 kernel: [ 870.780262] [<ffffffff8100e8b1>] do_softirq+0x41/0x81
Mar 10 07:48:58 N1002563 kernel: [ 870.780268] [<ffffffff8104f7bd>] irq_exit+0x36/0x75
Mar 10 07:48:58 N1002563 kernel: [ 870.780274] [<ffffffff81020f33>] smp_apic_timer_interrupt+0x88/0x96
Mar 10 07:48:58 N1002563 kernel: [ 870.780287] [<ffffffff8100c6b3>] apic_timer_interrupt+0x13/0x20
Mar 10 07:48:58 N1002563 kernel: [ 870.780291] <EOI> [<ffffffff81027740>] ? native_safe_halt+0x6/0x8
Mar 10 07:48:58 N1002563 kernel: [ 870.780304] [<ffffffff81012da3>] ? default_idle+0x55/0x74
Mar 10 07:48:58 N1002563 kernel: [ 870.780309] [<ffffffff810131ce>] ? c1e_idle+0xf4/0xfb
Mar 10 07:48:58 N1002563 kernel: [ 870.780315] [<ffffffff81065529>] ? atomic_notifier_call_chain+0x13/0x15
Mar 10 07:48:58 N1002563 kernel: [ 870.780321] [<ffffffff8100aeec>] ? cpu_idle+0x5b/0x93
Mar 10 07:48:58 N1002563 kernel: [ 870.780329] [<ffffffff81304144>] ? start_secondary+0x1a8/0x1ac
Mar 10 07:48:58 N1002563 kernel: [ 870.780334] ---[ end trace 08b420ca1e09a176 ]---
Mar 10 07:48:58 N1002563 kernel: [ 870.780339] bnx2: eth0 DEBUG: intr_sem[0]
Mar 10 07:48:58 N1002563 kernel: [ 870.780345] bnx2: eth0 DEBUG: EMAC_TX_STATUS[00000008] RPM_MGMT_PKT_CTRL[00000000]
Mar 10 07:48:58 N1002563 kernel: [ 870.780352] bnx2: eth0 DEBUG: MCP_STATE_P0[00000000] MCP_STATE_P1[00000000]
Mar 10 07:48:58 N1002563 kernel: [ 870.780357] bnx2: eth0 DEBUG: HC_STATS_INTERRUPT_STATUS[00000000]
Mar 10 07:49:03 N1002563 kernel: [ 875.780020] bnx2: eth0 DEBUG: intr_sem[0]
Mar 10 07:49:03 N1002563 kernel: [ 875.780026] bnx2: eth0 DEBUG: EMAC_TX_STATUS[00000008] RPM_MGMT_PKT_CTRL[00000000]
Mar 10 07:49:03 N1002563 kernel: [ 875.780038] bnx2: eth0 DEBUG: MCP_STATE_P0[00000000] MCP_STATE_P1[00000000]
Mar 10 07:49:03 N1002563 kernel: [ 875.780043] bnx2: eth0 DEBUG: HC_STATS_INTERRUPT_STATUS[00000000]

This debug message would repeat every 5 seconds, eventually
the systems locks-up.

This is running a 2.6.32-8 stable kernel, I've tried a version with Ben's
patch from this thread installed with no change in behavior. I'm in the
process of backporting all the upstream changes to see if that helps.

Guessing it's a race condition caused by these calls in bnx2_set_coalesce():

if (netif_running(bp->dev)) {
bnx2_netif_stop(bp);
bnx2_init_nic(bp, 0);
bnx2_netif_start(bp);
}

Thanks for any help,

-Brian


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