[FS#4019] Mikrotik RB750gr3 - Reboot after Kernel Bug

[OpenWrt Bugs]

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A new Flyspray task has been opened.  Details are below. 

User who did this - compassnet (compassnet) 

Attached to Project - OpenWrt/LEDE Project
Summary - Mikrotik RB750gr3 - Reboot after Kernel Bug
Task Type - Bug Report
Category - Base system
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - Low
Priority - Very Low
Reported Version - Trunk
Due in Version - Undecided
Due Date - Undecided
Details - Device: Mikrotik RB750Gr3
OpenWrt version: 21.02.0
Bug: The router rebooted with the message below
How to reproduce: Unknown (wasn't doing anything special; uptime around 3/4 days)


Wed Sep  8 13:14:43 2021 kern.warn kernel: [305779.094192] Kernel bug detected[#1]:
Wed Sep  8 13:14:43 2021 kern.warn kernel: [305779.097889] CPU: 3 PID: 12765 Comm: kworker/3:2 Not tainted 5.4.143 #0
Wed Sep  8 13:14:43 2021 kern.warn kernel: [305779.104512] Workqueue: wg-crypt-WIREGUARD 0x8ef144dc [wireguard at cea4334d+0xc030]
Wed Sep  8 13:14:43 2021 kern.warn kernel: [305779.111975] $ 0   : 00000000 00000001 00000094 0000007c
Wed Sep  8 13:14:43 2021 kern.warn kernel: [305779.117292] $ 4   : 8e6b3000 00000001 0000058c 00000001
Wed Sep  8 13:14:43 2021 kern.warn kernel: [305779.122605] $ 8   : 00000000 8e6b3620 435b0b6a cacb6a43
Wed Sep  8 13:14:43 2021 kern.warn kernel: [305779.127903] $12   : 1047b37c cfd69df4 1bd0788b ee025612
Wed Sep  8 13:14:43 2021 kern.warn kernel: [305779.133195] $16   : 8e6600c0 00000000 ffffffe8 00000010
Wed Sep  8 13:14:43 2021 kern.warn kernel: [305779.138495] $20   : 0000058c 00000001 ffffffed 8f134ce8
Wed Sep  8 13:14:43 2021 kern.warn kernel: [305779.143801] $24   : 000000ca dcc91431
Wed Sep  8 13:14:43 2021 kern.warn kernel: [305779.149119] $28   : 8e4be000 8e4bfc18 806c27c0 8ef13f50
Wed Sep  8 13:14:43 2021 kern.warn kernel: [305779.154436] Hi    : 0fea80e1
Wed Sep  8 13:14:43 2021 kern.warn kernel: [305779.157405] Lo    : ee025612
Wed Sep  8 13:14:43 2021 kern.warn kernel: [305779.160381] epc   : 80433448 0x80433448
Wed Sep  8 13:14:43 2021 kern.warn kernel: [305779.164308] ra    : 8ef13f50 0x8ef13f50 [wireguard at cea4334d+0xc030]
Wed Sep  8 13:14:43 2021 kern.warn kernel: [305779.170638] Status: 11007c03     KERNEL EXL IE
Wed Sep  8 13:14:43 2021 kern.warn kernel: [305779.174899] Cause : 50800034 (ExcCode 0d)
Wed Sep  8 13:14:43 2021 kern.warn kernel: [305779.178981] PrId  : 0001992f (MIPS 1004Kc)
Wed Sep  8 13:14:43 2021 kern.warn kernel: [305779.183150] Modules linked in: pppoe ppp_async iptable_nat xt_state xt_nat xt_conntrack xt_REDIRECT xt_MASQUERADE xt_FLOWOFFLOAD xt_CT wireguard pppox ppp_generic nf_nat nf_flow_table_hw nf_flow_table nf_conntrack libchacha20poly1305 libblake2s ipt_REJECT xt_time xt_tcpudp xt_multiport xt_mark xt_mac xt_limit xt_comment xt_TCPMSS xt_LOG slhc poly1305_mips nf_reject_ipv4 nf_log_ipv4 nf_defrag_ipv6 nf_defrag_ipv4 libcurve25519_generic libblake2s_generic iptable_mangle iptable_filter ip_tables crc_ccitt chacha_mips nf_log_ipv6 nf_log_common ip6table_mangle ip6table_filter ip6_tables ip6t_REJECT x_tables nf_reject_ipv6 ip6_udp_tunnel udp_tunnel kpp leds_gpio xhci_plat_hcd xhci_pci xhci_mtk xhci_hcd gpio_button_hotplug usbcore nls_base usb_common
Wed Sep  8 13:14:43 2021 kern.warn kernel: [305779.248755] Process kworker/3:2 (pid: 12765, threadinfo=71542827, task=0d5fcf1e, tls=00000000)
Wed Sep  8 13:14:43 2021 kern.warn kernel: [305779.257423] Stack : 8ec0a800 00000010 0000058c 8f134cc0 8e6600c0 00000000 8ec0a800 8ef13f50

I might have to downgrade back to 19.07.8 if this continues.

https://bugs.openwrt.org/index.php?do=details&task_id=2628 will be back if I downgrade, but at least it didn't reboot the router.

Luckily I kept a configuration backup for 19.07.8 before the upgrade to 21.02.0. :)

Compass.

More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=4019

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