[Bug 259670] graphics/drm-kmod: sporadic GPU hang with i915kms

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=259670

--- Comment #2 from Oleh Vinichenko <[email protected]> ---
for testing purposes i updated for latest HEAD of drm-kmod and ran for a day
with
sway, which after some time resulted in kernel crash. Here is the debugger
information:

Reading symbols from
/usr/obj/usr/src/amd64.amd64/sys/CHAKLUNCHIK/kernel.full...

Unread portion of the kernel message buffer:
drmn0: GPU HANG: ecode 6:1:00000000, in sway [100963]


Fatal trap 12: page fault while in kernel mode
cpuid = 2; apic id = 02
fault virtual address   = 0x61
fault code              = supervisor read data, page not present
instruction pointer     = 0x20:0xffffffff80999d27
stack pointer           = 0x28:0xfffffe001b159b80
frame pointer           = 0x28:0xfffffe001b159bc0
code segment            = base 0x0, limit 0xfffff, type 0x1b
                        = DPL 0, pres 1, long 1, def32 0, gran 1
processor eflags        = interrupt enabled, resume, IOPL = 0
current process         = 0 (linuxkpi_short_wq_3)
trap number             = 12
WARNING !drm_modeset_is_locked(&crtc->mutex) failed at
/var/src/drm-kmod/drivers/gpu/drm/drm_atomic_helper.c:616
WARNING !drm_modeset_is_locked(&crtc->mutex) failed at
/var/src/drm-kmod/drivers/gpu/drm/drm_atomic_helper.c:616
WARNING !drm_modeset_is_locked(&dev->mode_config.connection_mutex) failed at
/var/src/drm-kmod/drivers/gpu/drm/drm_atomic_helper.c:661

<4>WARN_ON(!mutex_is_locked(&fbc->lock))WARN_ON(!mutex_is_locked(&fbc->lock))WARN_ON(!mutex_is_locked(&fbc->lock))WARN_ON(!mutex_is_locked(&fbc->lock))
panic: page fault
cpuid = 2
time = 1637288382
KDB: stack backtrace:
#0 0xffffffff80773ebb at kdb_backtrace+0x6b
#1 0xffffffff80726fb7 at vpanic+0x187
#2 0xffffffff80726e23 at panic+0x43
#3 0xffffffff80a43fd7 at trap_fatal+0x387
#4 0xffffffff80a4402f at trap_pfault+0x4f
#5 0xffffffff80a437a0 at trap+0x4a0
#6 0xffffffff80a1c878 at calltrap+0x8
#7 0xffffffff80999e1d at kmem_free+0x2d
#8 0xffffffff81d6633c at __i915_gpu_coredump_free+0xfc
#9 0xffffffff81d3d4e9 at intel_gt_handle_error+0xa9
#10 0xffffffff81d2bef0 at heartbeat+0x110
#11 0xffffffff808f19fd at linux_work_fn+0xed
#12 0xffffffff807889d7 at taskqueue_run_locked+0x197
#13 0xffffffff80789d03 at taskqueue_thread_loop+0xc3
#14 0xffffffff806e48ae at fork_exit+0x8e
#15 0xffffffff80a1d8ee at fork_trampoline+0xe
WARNING !drm_modeset_is_locked(&crtc->mutex) failed at
/var/src/drm-kmod/drivers/gpu/drm/drm_atomic_helper.c:616
WARNING !drm_modeset_is_locked(&crtc->mutex) failed at
/var/src/drm-kmod/drivers/gpu/drm/drm_atomic_helper.c:616
WARNING !drm_modeset_is_locked(&dev->mode_config.connection_mutex) failed at
/var/src/drm-kmod/drivers/gpu/drm/drm_atomic_helper.c:661

<4>WARN_ON(!mutex_is_locked(&fbc->lock))WARN_ON(!mutex_is_locked(&fbc->lock))WARN_ON(!mutex_is_locked(&fbc->lock))WARN_ON(!mutex_is_locked(&fbc->lock))
Uptime: 15h52m16s
WARNING !drm_modeset_is_locked(&crtc->mutex) failed at
/var/src/drm-kmod/drivers/gpu/drm/drm_atomic_helper.c:616
WARNING !drm_modeset_is_locked(&crtc->mutex) failed at
/var/src/drm-kmod/drivers/gpu/drm/drm_atomic_helper.c:616
WARNING !drm_modeset_is_locked(&dev->mode_config.connection_mutex) failed at
/var/src/drm-kmod/drivers/gpu/drm/drm_atomic_helper.c:661

<4>WARN_ON(!mutex_is_locked(&fbc->lock))WARN_ON(!mutex_is_locked(&fbc->lock))WARN_ON(!mutex_is_locked(&fbc->lock))WARN_ON(!mutex_is_locked(&fbc->lock))
Dumping 1930 out of 16242 MB:..1% (CTRL-C to abort)
..11%..21%..31%..41%..51%..61%..71%..81%..91%

__curthread () at /usr/src/sys/amd64/include/pcpu_aux.h:55
55              __asm("movq %%gs:%P1,%0" : "=r" (td) : "n" (offsetof(struct
pcpu,

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