netdev - RE: [PATCH net v4 1/1] mlxbf_gige: Fix kernel panic at shutdown

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Date: Fri, 21 Jul 2023 19:06:03 +0000
From: Asmaa Mnebhi <asmaa@...dia.com>
To: Vladimir Oltean <olteanv@...il.com>
CC: "davem@...emloft.net" <davem@...emloft.net>, "edumazet@...gle.com"
	<edumazet@...gle.com>, "kuba@...nel.org" <kuba@...nel.org>,
	"pabeni@...hat.com" <pabeni@...hat.com>, "netdev@...r.kernel.org"
	<netdev@...r.kernel.org>, "sridhar.samudrala@...el.com"
	<sridhar.samudrala@...el.com>, "maciej.fijalkowski@...el.com"
	<maciej.fijalkowski@...el.com>, David Thompson <davthompson@...dia.com>
Subject: RE: [PATCH net v4 1/1] mlxbf_gige: Fix kernel panic at shutdown

> What is the race condition; what does the stack trace of the NPD look like?

Hi Vladimir,

[  OK  ] Reached target Shutdown.
[  OK  ] Reached target Final Step.
[  OK  ] Started Reboot.
[  OK  ] Reached target Reboot.
...
[  285.126250] mlxbf_gige MLNXBF17:00: shutdown
[  285.130669] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000070
[  285.139447] Mem abort info:
[  285.142228]   ESR = 0x0000000096000004
[  285.145964]   EC = 0x25: DABT (current EL), IL = 32 bits
[  285.151261]   SET = 0, FnV = 0
[  285.154303]   EA = 0, S1PTW = 0
[  285.157430]   FSC = 0x04: level 0 translation fault
[  285.162293] Data abort info:
[  285.165159]   ISV = 0, ISS = 0x00000004
[  285.168980]   CM = 0, WnR = 0
[  285.171932] user pgtable: 4k pages, 48-bit VAs, pgdp=000000011d373000
[  285.178358] [0000000000000070] pgd=0000000000000000, p4d=0000000000000000
[  285.185134] Internal error: Oops: 96000004 [#1] SMP