From mboxrd@z Thu Jan 1 00:00:00 1970
From: bugzilla-daemon@bugzilla.kernel.org
Subject: [Bug 49531] New: Powering down inactive GPU while running X causes
NULL pointer dereference
Date: Thu, 25 Oct 2012 18:44:56 +0000 (UTC)
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https://bugzilla.kernel.org/show_bug.cgi?id=49531
Summary: Powering down inactive GPU while running X causes NULL
pointer dereference
Product: Drivers
Version: 2.5
Kernel Version: 3.7.0-rc2+
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: Video(DRI - non Intel)
AssignedTo: drivers_video-dri@kernel-bugs.osdl.org
ReportedBy: e-mail@date.by
CC: alexdeucher@gmail.com
Regression: No
Created an attachment (id=84841)
--> (https://bugzilla.kernel.org/attachment.cgi?id=84841)
/var/log/syslog
On my muxed hybrid system (Lenovo IdeaPad U455) vga_switcheroo works fine if X
is not running. But if both GPUs are powered and X is running, then when i try
to power down inactive GPU with
# echo OFF > /sys/kernel/debug/vgaswitcheroo/switch
kernel crashes after a couple of minutes.
There is an error message in the /var/log/syslog:
BUG: unable to handle kernel NULL pointer dereference at (null)
IP: [] r600_pcie_gart_tlb_flush+0xeb/0x110 [radeon]
PGD 8d24c067 PUD 8d24b067 PMD 0
Oops: 0000 [#1] SMP DEBUG_PAGEALLOC
Modules linked in: snd_seq_dummy snd_seq_oss snd_seq_midi_event snd_seq
snd_seq_device snd_pcm_oss snd_mixer_oss ipv6 pcmcia pcmcia_core xfs exportfs
ext2 mbcache cpufreq_ondemand mperf lp parport_pc parport fuse uvcvideo
videobuf2_vmalloc videobuf2_memops videobuf2_core videodev media btusb
bluetooth joydev brcmsmac radeon cordic brcmutil mac80211 ttm drm_kms_helper
snd_hda_codec_hdmi snd_hda_codec_conexant drm cfg80211 snd_hda_intel agpgart
snd_hda_codec snd_hwdep sp5100_tco ohci_hcd i2c_piix4 powernow_k8
ideapad_laptop i2c_algo_bit psmouse sparse_keymap snd_pcm ehci_hcd i2c_core
processor freq_table rfkill thermal bcma rtc_cmos atl1c snd_page_alloc
serio_raw k8temp thermal_sys snd_timer shpchp button battery snd soundcore
hwmon evdev ac loop btrfs [last unloaded: pcmcia_core]
CPU 0
Pid: 2291, comm: X Not tainted 3.7.0-rc2+ #70 LENOVO 20046
/AMD CRB
RIP: 0010:[] []
r600_pcie_gart_tlb_flush+0xeb/0x110 [radeon]
RSP: 0018:ffff8800894d1918 EFLAGS: 00010282
RAX: ffffc90001322f34 RBX: 0000000000000000 RCX: 00000000aadfb000
RDX: 0000000000000000 RSI: 0000000000002f34 RDI: ffff8800aad18000
RBP: ffff8800894d1928 R08: 00000000dfffffff R09: 00000000000000d0
R10: 0000000000031cd5 R11: 0000000000000000 R12: ffff8800aad18000
R13: 0000000000000219 R14: 0000000000000219 R15: 0000000000000000
FS: 00007f8819d618c0(0000) GS:ffff8800afa00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000008d18d000 CR4: 00000000000007f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Process X (pid: 2291, threadinfo ffff8800894d0000, task ffff88008d128000)
Stack:
ffff8800aad18000 0000000000000219 ffff8800894d1958 ffffffffa043d365
ffff8800896f1580 ffff8800894d1bc8 0000000000000000 ffff8800894d1bc8
ffff8800894d1968 ffffffffa043a98a ffff8800894d1988 ffffffffa01ef097
Call Trace:
[] radeon_gart_unbind+0xa5/0xe0 [radeon]
[] radeon_ttm_backend_unbind+0x1a/0x20 [radeon]
[] ttm_tt_unbind+0x27/0x40 [ttm]
[] ttm_bo_move_memcpy+0x266/0x580 [ttm]
[] radeon_bo_move+0xd3/0x180 [radeon]
[] ttm_bo_handle_move_mem+0x216/0x3f0 [ttm]
[] ? ttm_bo_mem_space+0x180/0x360 [ttm]
[] ttm_bo_move_buffer+0x142/0x150 [ttm]
[] ttm_bo_validate+0x9c/0x120 [ttm]
[] radeon_bo_pin_restricted+0x10a/0x1b0 [radeon]
[] radeon_crtc_cursor_set+0x9b/0x4a0 [radeon]
[] ? drm_mode_object_find+0x68/0x90 [drm]
[] drm_mode_cursor_ioctl+0x105/0x160 [drm]
[] drm_ioctl+0x4c3/0x570 [drm]
[] ? drm_mode_setcrtc+0x5a0/0x5a0 [drm]
[] ? __do_page_fault+0x25c/0x4b0
[] do_vfs_ioctl+0x90/0x570
[] ? rw_verify_area+0x4b/0xf0
[] ? __set_task_blocked+0x37/0x80
[] ? _raw_spin_unlock_irq+0xe/0x20
[] ? __set_current_blocked+0x52/0x60
[] sys_ioctl+0x91/0xb0
[] system_call_fastpath+0x16/0x1b
Code: c1 e8 04 83 f8 02 74 2a 85 c0 74 cc 5b 41 5c 5d c3 0f 1f 80 00 00 00 00
31 d2 be 34 2f 00 00 48 8b 9f 98 03 00 00 e8 e5 37 ff ff <8b> 03 e9 4a ff ff ff
48 c7 c7 f0 9f 4b a0 31 c0 e8 f3 5d 0d e1
RIP [] r600_pcie_gart_tlb_flush+0xeb/0x110 [radeon]
RSP
CR2: 0000000000000000
---[ end trace 4363d7f2115bb109 ]---
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