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: gnats-bugs%netbsd.org@localhost
Cc: 
Subject: Re: kern/56561: cv_is_valid assertion failure in intel drm
Date: Tue, 21 Dec 2021 10:18:42 +0000

 While "idle" (running X) same laptop/kernel just fell over with:
 
 Crash version 9.99.92, image version 9.99.92.
 crash: _kvm_kvatop(0)
 Kernel compiled without options LOCKDEBUG.
 System panicked: trap
 Backtrace from time of crash is available.
 crash> bt
 _KERNEL_OPT_NVGA_RASTERCONSOLE() at 0
 _KERNEL_OPT_PMS_DISABLE_POWERHOOK() at ffffa6814e59a000
 sys_reboot() at sys_reboot
 vpanic() at vpanic+0x154
 device_printf() at device_printf
 startlwp() at startlwp
 calltrap() at calltrap+0x19
 intel_disable_ddi() at intel_disable_ddi+0xa3
 intel_encoders_disable() at intel_encoders_disable+0x90
 hsw_crtc_disable() at hsw_crtc_disable+0x13
 intel_old_crtc_state_disables() at intel_old_crtc_state_disables+0x11c
 intel_atomic_commit_tail() at intel_atomic_commit_tail+0xf1b
 intel_atomic_commit() at intel_atomic_commit+0x29e
 drm_atomic_connector_commit_dpms() at drm_atomic_connector_commit_dpms+0xe0
 drm_mode_obj_set_property_ioctl() at drm_mode_obj_set_property_ioctl+0x162
 drm_connector_property_set_ioctl() at drm_connector_property_set_ioctl+0x27
 drm_ioctl() at drm_ioctl+0x2cb
 drm_ioctl_shim() at drm_ioctl_shim+0x2f
 sys_ioctl() at sys_ioctl+0x555
 syscall() at syscall+0x18c
 --- syscall (number 54) ---
 syscall+0x18c:
 
 (gdb couldn't make sense of the corefile(!))
 
 PID    LID S CPU     FLAGS       STRUCT LWP *               NAME WAIT
 1511 >1511 7   1        40   ffffed90b3166240                  X
 0    > 189 7   2       240   ffffed90adf20bc0            ioflush
 0    > 163 7   0       200   ffffed90ada62580          nd6_timer
 0    > 202 7   3       240   ffffed90ad7f12c0               iic0
 0    > 124 1   7       201   ffffed90acf791c0             idle/7
 0    > 118 1   6       201   ffffed90acf2c140             idle/6
 0    > 112 1   5       201   ffffed90aceaf0c0             idle/5
 0    > 106 1   4       201   ffffed90ace52040             idle/4
 0    >   6 7   0       200   ffffed9408ffe4c0          softser/0
 0    >   5 7   0       200   ffffed9408ffe080          softclk/0