Re: kern/56557: Boot fails with DRM assertion failure

[Taylor R Campbell <riastradh%NetBSD.org@localhost>]

The following reply was made to PR kern/56557; it has been noted by GNATS.

From: Taylor R Campbell <riastradh%NetBSD.org@localhost>
To: gnats-bugs%NetBSD.org@localhost
Cc: gson%gson.org@localhost
Subject: Re: kern/56557: Boot fails with DRM assertion failure
Date: Fri, 24 Dec 2021 14:21:50 +0000

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 Can you get a log with the attached patch?  Won't fix anything, but
 the stack trace it prints might help with diagnosis.
 
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 diff --git a/sys/external/bsd/drm2/linux/linux_ww_mutex.c b/sys/external/bs=
 d/drm2/linux/linux_ww_mutex.c
 index 5e443aa3f54b..4dd077c0b1e0 100644
 --- a/sys/external/bsd/drm2/linux/linux_ww_mutex.c
 +++ b/sys/external/bsd/drm2/linux/linux_ww_mutex.c
 @@ -98,6 +98,7 @@ ww_acquire_init(struct ww_acquire_ctx *ctx, struct ww_cla=
 ss *class)
  	ctx->wwx_acquire_done =3D false;
  }
 =20
 +#include <ddb/ddb.h>
  void
  ww_acquire_done(struct ww_acquire_ctx *ctx)
  {
 @@ -105,6 +106,8 @@ ww_acquire_done(struct ww_acquire_ctx *ctx)
  	KASSERTMSG((ctx->wwx_owner =3D=3D curlwp),
  	    "ctx %p owned by %p, not self (%p)", ctx, ctx->wwx_owner, curlwp);
 =20
 +	printf("%s ctx=3D%p\n", __func__, ctx);
 +	db_stacktrace();
  	ctx->wwx_acquire_done =3D true;
  }
 =20
 
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