Bug 229995 - [panic, regression] radeonkms "timed sleep before timers are working"
Summary: [panic, regression] radeonkms "timed sleep before timers are working"
Status: New
Alias: None
Product: Base System
Classification: Unclassified
Component: kern (show other bugs)
Version: 11.2-RELEASE
Hardware: amd64 Any
: --- Affects Some People
Assignee: freebsd-bugs mailing list
URL:
Keywords: panic, regression
Depends on:
Blocks:
 
Reported: 2018-07-23 23:05 UTC by Andrew Daugherity
Modified: 2018-08-07 21:40 UTC (History)
0 users

See Also:


Attachments
dmesg w/panic (7.87 KB, text/plain)
2018-07-23 23:05 UTC, Andrew Daugherity
no flags Details

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Description Andrew Daugherity 2018-07-23 23:05:04 UTC
Created attachment 195401 [details]
dmesg w/panic

On a system where I have radeonkms activated via /boot/loader.conf:
kern.vty=vt
radeonkms_load="YES"
radeonkmsfw_R100_cp_load="YES"

This worked properly in 10.2 and 10.3.  I recently upgraded to 11.2 and was greeted by a kernel panic:
====
drmn0: <ATI ES1000 RN50> on vgapci0
info: [drm] RADEON_IS_PCI
[...]
info: [drm] Loading R100 Microcode
info: [drm] radeon: ring at 0x00000000C0001000
info: [drm] ring test succeeded in 2 usecs
panic: timed sleep before timers are working
cpuid = 2
KDB: stack backtrace:
#0 0xffffffff80b3d567 at kdb_backtrace+0x67
#1 0xffffffff80af6b07 at vpanic+0x177
#2 0xffffffff80af6983 at panic+0x43
#3 0xffffffff80b4a363 at sleepq_set_timeout_sbt+0x103
#4 0xffffffff80a96bbc at _cv_timedwait_sbt+0x13c
#5 0xffffffff826e6b05 at radeon_fence_wait_seq+0x1d5
#6 0xffffffff826e68ea at radeon_fence_wait+0x2a
#7 0xffffffff8271e2c2 at r100_ib_test+0x202
#8 0xffffffff826f803a at radeon_ib_ring_tests+0x2a
#9 0xffffffff826e1e61 at radeon_device_init+0x511
#10 0xffffffff826ee443 at radeon_driver_load_kms+0xa3
#11 0xffffffff8289aa06 at drm_get_pci_dev+0x436
#12 0xffffffff8289d6fa at drm_attach_helper+0x13a
#13 0xffffffff826e579f at radeon_attach+0x4f
#14 0xffffffff80b2fc98 at device_attach+0x3b8
#15 0xffffffff80b30f3d at bus_generic_attach+0x3d
#16 0xffffffff8077f0fe at vga_pci_attach+0x3e
#17 0xffffffff80b2fc98 at device_attach+0x3b8
Uptime: 1s
Automatic reboot in 15 seconds - press a key on the console to abort
====

It only panics when loading the module at boot.  If I 'kldload radeonkms' after the system has booted, there is no problem.  (So doing that via rc.local is a workaround at least...)

Note that when the system is up, kldload will automatically load the necessary firmware modules, but loader(8) will not, hence my specifying radeonkmsfw_R100_cp_load explicitly.  If I leave that line out, the radeonkms driver will complain about missing firmware, but the system will not panic.

The full dmesg is attached.  For comparison, a successful load of radeonkms after bootup produces mostly the same output up to the "ring test succeeded message", after which it prints another 30 lines or so:
====
info: [drm] ring test succeeded in 0 usecs
info: [drm] ib test succeeded in 0 usecs
info: [drm] radeon_device_init: Taking over the fictitious range 0xe0000000-0xe4000000
radeon_iicbb0 on drmn0
iicbus0: <Philips I2C bus> on iicbb0 addr 0xff
iic0: <I2C generic I/O> on iicbus0
radeon_iicbb1 on drmn0
iicbus1: <Philips I2C bus> on iicbb1 addr 0xff
iic1: <I2C generic I/O> on iicbus1
radeon_iicbb2 on drmn0
iicbus2: <Philips I2C bus> on iicbb2 addr 0xff
iic2: <I2C generic I/O> on iicbus2
radeon_iicbb3 on drmn0
iicbus3: <Philips I2C bus> on iicbb3 addr 0xff
iic3: <I2C generic I/O> on iicbus3
info: [drm] Radeon Display Connectors
info: [drm] Connector 0:
info: [drm]   VGA-1
info: [drm]   DDC: 0x60 0x60 0x60 0x60 0x60 0x60 0x60 0x60
info: [drm]   Encoders:
info: [drm]     CRT1: INTERNAL_DAC1
info: [drm] Connector VGA-1: get mode from tunables:
info: [drm]   - kern.vt.fb.modes.VGA-1
info: [drm]   - kern.vt.fb.default_mode
info: [drm] fb mappable at 0xE0040000
info: [drm] vram apper at 0xE0000000
info: [drm] size 2621440
info: [drm] fb depth is 16
info: [drm]    pitch is 2560
fbd0 on drmn0
VT: Replacing driver "vga" with new "fb".
====

Workaround:
Comment out any 'radeonkms*_load' lines in /boot/loader.conf and add 'kldload radeonkms' to /etc/rc.local, to load the driver later in the boot process.
Comment 1 Andrew Daugherity 2018-08-07 21:40:52 UTC
Tested several other FreeBSD versions via editing /boot/loader.conf on the mini-memstick installer:
10.4: OK
11.0, 11.1: panics same as 11.2
12.0-current: panics and reboots immediately.  Using a serial console, the last message printed is the "[drm] ring test succeeded" message (same place where 11.x panics).

The 11.2 installer also reboots immediately, rather than showing the panic as the installed system does.  I guess there's a loader setting controlling that?