Re: kern/56561: cv_is_valid assertion failure in intel drm

[Patrick Welche <prlw1%cam.ac.uk@localhost>]

The following reply was made to PR kern/56561; it has been noted by GNATS.

From: Patrick Welche <prlw1%cam.ac.uk@localhost>
To: Taylor R Campbell <riastradh%NetBSD.org@localhost>
Cc: gnats-bugs%NetBSD.org@localhost
Subject: Re: kern/56561: cv_is_valid assertion failure in intel drm
Date: Sun, 26 Dec 2021 17:54:13 +0000

 On Fri, Dec 24, 2021 at 01:47:11PM +0000, Taylor R Campbell wrote:
 > Do you have dmesg from the crash dump of the latest crash?  Wondering
 > whether the original trap description is there.
 
 Indeed it is! It turns out the trap happens more frequently, and
 usually when idle. This is with a 22 Dec 9.99.93 kernel:
 
 prevented execution of 0x0 (SMEP)
 fatal page fault in supervisor mode
 trap type 6 code 0x10 rip 0 cs 0x8 rflags 0x10246 cr2 0 ilevel 0 rsp 0xffff94014e33a898
 curlwp 0xffffc78220fd6b00 pid 1521.1521 lowest kstack 0xffff94014e3362c0
 panic: trap
 cpu1: Begin traceback...
 vpanic() at netbsd:vpanic+0x14a
 panic() at netbsd:panic+0x3c
 trap() at netbsd:trap+0xa7d
 --- trap (number 6) ---
 ?() at 0
 intel_disable_ddi() at netbsd:intel_disable_ddi+0xa3
 intel_encoders_disable() at netbsd:intel_encoders_disable+0x90
 hsw_crtc_disable() at netbsd:hsw_crtc_disable+0x13
 intel_old_crtc_state_disables() at netbsd:intel_old_crtc_state_disables+0x11c
 intel_atomic_commit_tail() at netbsd:intel_atomic_commit_tail+0xf1b
 intel_atomic_commit() at netbsd:intel_atomic_commit+0x29e
 drm_atomic_connector_commit_dpms() at netbsd:drm_atomic_connector_commit_dpms+0xe0
 drm_mode_obj_set_property_ioctl() at netbsd:drm_mode_obj_set_property_ioctl+0x162
 drm_connector_property_set_ioctl() at netbsd:drm_connector_property_set_ioctl+0x27
 drm_ioctl() at netbsd:drm_ioctl+0x2cb
 drm_ioctl_shim() at netbsd:drm_ioctl_shim+0x2f
 sys_ioctl() at netbsd:sys_ioctl+0x555
 syscall() at netbsd:syscall+0x18c
 --- syscall (number 54) ---
 netbsd:syscall+0x18c:
 cpu1: End traceback...