NetBSD Problem Report #55327

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Date: Sun, 31 May 2020 13:23:01 +0000 (UTC)
From: rokuyama.rk@gmail.com
Reply-To: rokuyama.rk@gmail.com
To: gnats-bugs@NetBSD.org
Subject: !cpu_intr_p() assertion failure in DDB
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>Number:         55327
>Category:       kern
>Synopsis:       !cpu_intr_p() assertion failure in DDB
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sun May 31 13:25:00 +0000 2020
>Last-Modified:  Mon Jun 01 00:45:00 +0000 2020
>Originator:     Rin Okuyama
>Release:        9.99.64
>Organization:
Department of Physics, Meiji University
>Environment:
Should be MI problem, but,
NetBSD obs266 9.99.64 NetBSD 9.99.64 (OBS266) #214: Sun May 31 18:33:52 JST 2020  rin@latipes:/usr/src/sys/arch/evbppc/compile/OBS266 evbppc
>Description:
DDB can be running in the interrupt context, when, e.g., activated from
console. This results in !cpu_intr_p() assertion failure here and there.

Recently, I've hacked db_alloc() and friends to use kmem_intr_alloc(9),
instead of malloc(9). But, still, kill command at least triggers that
assertion failure:

~Stopped in pid 0.2 (system) at  netbsd:comintr+0x82c:   stw     r25, 0x6c(r27)
db> ps
PID    LID S CPU     FLAGS       STRUCT LWP *               NAME WAIT
1663  1663 3   0        80            77949c0                 sh ttyraw
...
db> kill 67f
panic: kernel diagnostic assertion "!cpu_intr_p()" failed: file "../../../../kern/kern_sig.c", line 1308
...
>How-To-Repeat:
Enable DIAGNOSTIC, enter DDB from console, then, kill some process.
>Fix:
No idea at the moment...

>Audit-Trail:
From: Christos Zoulas <christos@zoulas.com>
To: gnats-bugs@netbsd.org
Cc: kern-bug-people@netbsd.org,
 gnats-admin@netbsd.org,
 netbsd-bugs@netbsd.org
Subject: Re: kern/55327: !cpu_intr_p() assertion failure in DDB
Date: Sun, 31 May 2020 19:44:15 -0400

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 > Still, DDB kill command at least is broken.

 That has been broken for a long time for different reasons.

 christos

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From: Rin Okuyama <rokuyama.rk@gmail.com>
To: Christos Zoulas <christos@zoulas.com>, gnats-bugs@netbsd.org
Cc: kern-bug-people@netbsd.org, gnats-admin@netbsd.org, netbsd-bugs@netbsd.org
Subject: Re: kern/55327: !cpu_intr_p() assertion failure in DDB
Date: Mon, 1 Jun 2020 09:21:09 +0900

 On 2020/06/01 8:44, Christos Zoulas wrote:
 >> Still, DDB kill command at least is broken.
 > 
 > That has been broken for a long time for different reasons.
 Thanks. DDB is something like a tightrope walking, and I can imagine
 it is difficult to implement commands like "kill" consistently with
 other parts of kernel...

 Thanks,
 rin

From: matthew green <mrg@eterna.com.au>
To: Christos Zoulas <christos@zoulas.com>
Cc: kern-bug-people@netbsd.org, gnats-admin@netbsd.org,
    netbsd-bugs@netbsd.org, gnats-bugs@netbsd.org
Subject: re: kern/55327: !cpu_intr_p() assertion failure in DDB
Date: Mon, 01 Jun 2020 10:43:25 +1000

 > > Still, DDB kill command at least is broken.
 > 
 > That has been broken for a long time for different reasons.

 i thought you fixed it a while ago... ;-)

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