linux-kernel - Re: WARNING: at net/sched/sch

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Date:   Thu, 24 Oct 2019 12:50:11 -0700
From:   Vinicius Costa Gomes <vinicius.gomes@...el.com>
To:     Davidlohr Bueso <dave@...olabs.net>, netdev@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org
Subject: Re: WARNING: at net/sched/sch_generic.c:448

Hi,

Davidlohr Bueso <dave@...olabs.net> writes:

> Hi,
>
> I'm hitting the following in linux-next, and as far back as v5.2, ring any bells?
>
> [  478.588144] NETDEV WATCHDOG: eth0 (igb): transmit queue 0 timed out
> [  478.601994] WARNING: CPU: 10 PID: 74 at net/sched/sch_generic.c:448 dev_watchdog+0x253/0x260
> [  478.620613] Modules linked in: ebtable_filter(E) ebtables(E) ip6table_filter(E) ip6_tables(E) iptable_filter(E) ip_tables(E) x_tables(E) bpfilter(E) scsi_transport_iscsi(E) af_packet(E) iscsi_ibft(E) iscsi_boot_sysfs(E) ext4(E) intel_rapl_msr(E) intel_rapl_common(E) crc16(E) mbcache(E) jbd2(E) sb_edac(E) x86_pkg_temp_thermal(E) intel_powerclamp(E) coretemp(E) kvm_intel(E) kvm(E) irqbypass(E) crc32_pclmul(E) iTCO_wdt(E) ghash_clmulni_intel(E) iTCO_vendor_support(E) aesni_intel(E) crypto_simd(E) cryptd(E) glue_helper(E) ipmi_si(E) igb(E) ioatdma(E) pcspkr(E) ipmi_devintf(E) mei_me(E) lpc_ich(E) mfd_core(E) ipmi_msghandler(E) joydev(E) i2c_i801(E) mei(E) dca(E) button(E) btrfs(E) libcrc32c(E) xor(E) raid6_pq(E) hid_generic(E) usbhid(E) sd_mod(E) mgag200(E) drm_kms_helper(E) syscopyarea(E) sysfillrect(E) sysimgblt(E) fb_sys_fops(E) i2c_algo_bit(E) isci(E) ehci_pci(E) drm_vram_helper(E) ahci(E) ehci_hcd(E) libsas(E) crc32c_intel(E) ttm(E) libahci(E) scsi_transport_sas(E) drm(E) usbcore(E)
> [  478.620658]  libata(E) wmi(E) sg(E) dm_multipath(E) dm_mod(E) scsi_dh_rdac(E) scsi_dh_emc(E) scsi_dh_alua(E) scsi_mod(E)
> [  478.837008] CPU: 10 PID: 74 Comm: ksoftirqd/10 Kdump: loaded Tainted: G            E     5.4.0-rc4-2-default+ #2
> [  478.859457] Hardware name: Intel Corporation LH Pass/SVRBD-ROW_P, BIOS SE5C600.86B.02.01.SP04.112220131546 11/22/2013
> [  478.882867] RIP: 0010:dev_watchdog+0x253/0x260

Not ringing any bells, but if this timeout is happening, you should also
be seeing some igb "TX Hang" warnings. Usually this warning happens when
some packet is stuck (for whatever reason) in the transmission queue.

Can you share more details about what you are running? specially the
kind of configuration (if any) you are doing to the controller.


Cheers,
--
Vinicius