Bug 111171

Summary: Oops in the i915 driver with kernel 4.4
Product: Drivers Reporter: Zoltan Boszormenyi (zboszor)
Component: Video(DRI - Intel)Assignee: intel-gfx-bugs (intel-gfx-bugs)
Status: RESOLVED DUPLICATE    
Severity: normal CC: intel-gfx-bugs
Priority: P1    
Hardware: All   
OS: Linux   
Kernel Version: 4.4 Subsystem:
Regression: No Bisected commit-id:

Description Zoltan Boszormenyi 2016-01-22 12:47:31 UTC 
With kernel 4.4 and an uptime overnight, we got this Oops on an Intel based POS machine. The CPU is Atom D525 and thermal throttling is only supported via p4_clockmod on this chip. The Oops happened around pressing Ctrl-Alt-F2 to go to console from X. Xorg server 1.16.4 and xf86-video-intel 2.99.918-ish (git.fdo commit 627ef68a8cd7a51627d5b6a98cb0a5bdb1d9b534) was running on the system. The OS is a Yocto 1.6-based custom OpenEmbedded 64-bit build, the kernel was compiled to support module signing but Yocto doesn't actually sign its kernel modules, hence the "E" tainted flag.

Jan 19 03:52:33 chef01 kernel: Modules linked in: binfmt_misc(E) cpufreq_ondemand(E) tun(E) egalax_ts_serial(E) i915(E) joydev(E) hid_generic(E) usbhid(E) snd_hda_codec_realtek(
Jan 19 03:52:33 chef01 kernel:  nf_conntrack_ipv4(E) nf_defrag_ipv4(E) nf_nat(E) xt_connmark(E) nf_conntrack(E) ip6_tables(E) iptable_mangle(E)
Jan 19 03:52:33 chef01 kernel: CPU: 1 PID: 313 Comm: Xorg.bin Tainted: G            E   4.4.0 #1
Jan 19 03:52:33 chef01 kernel: Hardware name: SI SL20/SL20, BIOS 080016  04/01/2013
Jan 19 03:52:33 chef01 kernel:  ffffffffa0174c3f ffff8800741bb990 ffffffff8075359d 0000000000000000
Jan 19 03:52:33 chef01 kernel:  ffff8800741bb9c8 ffffffff8048fa08 ffff88007ba6d0c0 ffff88007b4d43c0
Jan 19 03:52:33 chef01 kernel:  ffff88007b4d43c0 ffff880056e8d000 ffff88007b8e9000 ffff8800741bb9d8
Jan 19 03:52:33 chef01 kernel: Call Trace:
Jan 19 03:52:33 chef01 kernel:  [<ffffffff8075359d>] dump_stack+0x44/0x57
Jan 19 03:52:33 chef01 kernel:  [<ffffffff8048fa08>] warn_slowpath_common+0x88/0xc0
Jan 19 03:52:33 chef01 kernel:  [<ffffffff8048fafa>] warn_slowpath_null+0x1a/0x20
Jan 19 03:52:33 chef01 kernel:  [<ffffffffa01657b3>] kref_get.part.9+0x1e/0x27 [drm]
Jan 19 03:52:33 chef01 kernel:  [<ffffffffa0151601>] drm_framebuffer_reference+0x51/0x60 [drm]
Jan 19 03:52:33 chef01 kernel:  [<ffffffffa0161ead>] drm_atomic_set_fb_for_plane+0x2d/0x90 [drm]
Jan 19 03:52:33 chef01 kernel:  [<ffffffffa01d35e0>] __drm_atomic_helper_set_config+0xd0/0x3b0 [drm_kms_helper]
Jan 19 03:52:33 chef01 kernel:  [<ffffffffa01d4506>] restore_fbdev_mode+0x1f6/0x260 [drm_kms_helper]
Jan 19 03:52:33 chef01 kernel:  [<ffffffffa01d65e3>] drm_fb_helper_restore_fbdev_mode_unlocked+0x33/0x80 [drm_kms_helper]
Jan 19 03:52:33 chef01 kernel:  [<ffffffffa01d665c>] drm_fb_helper_set_par+0x2c/0x50 [drm_kms_helper]
Jan 19 03:52:33 chef01 kernel:  [<ffffffffa032153a>] intel_fbdev_set_par+0x1a/0x60 [i915]
Jan 19 03:52:33 chef01 kernel:  [<ffffffff807c18b1>] fb_set_var+0x191/0x400
Jan 19 03:52:33 chef01 kernel:  [<ffffffff804be317>] ? update_curr+0x67/0x130
Jan 19 03:52:33 chef01 kernel:  [<ffffffff804bcd8c>] ? __enqueue_entity+0x6c/0x70
Jan 19 03:52:33 chef01 kernel:  [<ffffffff804c13ca>] ? enqueue_entity+0x34a/0x900
Jan 19 03:52:33 chef01 kernel:  [<ffffffff807b88fc>] fbcon_blank+0x1bc/0x2b0
Jan 19 03:52:33 chef01 kernel:  [<ffffffff808410ba>] do_unblank_screen+0xba/0x1c0
Jan 19 03:52:33 chef01 kernel:  [<ffffffff8083774a>] complete_change_console+0x5a/0xe0
Jan 19 03:52:33 chef01 kernel:  [<ffffffff808386ed>] vt_ioctl+0xf1d/0x10d0
Jan 19 03:52:33 chef01 kernel:  [<ffffffff80595b82>] ? do_wp_page+0x1d2/0x4d0
Jan 19 03:52:33 chef01 kernel:  [<ffffffff80586003>] ? __inc_zone_page_state+0x33/0x40
Jan 19 03:52:33 chef01 kernel:  [<ffffffff805cb005>] ? mem_cgroup_end_page_stat+0x5/0x50
Jan 19 03:52:33 chef01 kernel:  [<ffffffffa014b8b0>] ? drm_setmaster_ioctl+0xf0/0xf0 [drm]
Jan 19 03:52:33 chef01 kernel:  [<ffffffff8082bf34>] tty_ioctl+0x3d4/0xbc0
Jan 19 03:52:33 chef01 kernel:  [<ffffffff80597995>] ? handle_mm_fault+0xca5/0x16f0
Jan 19 03:52:33 chef01 kernel:  [<ffffffff806e6867>] ? selinux_file_ioctl+0x107/0x1d0
Jan 19 03:52:33 chef01 kernel:  [<ffffffff805ee61d>] do_vfs_ioctl+0x2cd/0x4b0
Jan 19 03:52:33 chef01 kernel:  [<ffffffff806dff43>] ? security_file_ioctl+0x43/0x60
Jan 19 03:52:33 chef01 kernel:  [<ffffffff805ee879>] SyS_ioctl+0x79/0x90
Jan 19 03:52:33 chef01 kernel:  [<ffffffff80ab24f6>] entry_SYSCALL_64_fastpath+0x16/0x75
Jan 19 03:52:33 chef01 kernel: ---[ end trace 80bfc40970d49658 ]---
Jan 19 03:52:33 chef01 kernel: BUG: unable to handle kernel NULL pointer dereference at 0000000000000060
Jan 19 03:52:36 chef01 kernel: IP: [<ffffffffa031810c>] intel_fb_obj_invalidate+0x1c/0x100 [i915]
Jan 19 03:52:36 chef01 kernel: PGD 74107067 PUD 741a2067 PMD 0 
Jan 19 03:52:36 chef01 kernel: Oops: 0000 [#1] SMP 
Jan 19 03:52:33 chef01 kernel: ------------[ cut here ]------------
Jan 19 03:52:33 chef01 kernel: WARNING: CPU: 1 PID: 313 at include/linux/kref.h:46 kref_get.part.9+0x1e/0x27 [drm]()
Jan 19 03:52:33 chef01 kernel: Modules linked in: binfmt_misc(E) cpufreq_ondemand(E) tun(E) egalax_ts_serial(E) i915(E) joydev(E) hid_generic(E) usbhid(E) snd_hda_codec_realtek(
Jan 19 03:52:33 chef01 kernel:  nf_conntrack_ipv4(E) nf_defrag_ipv4(E) nf_nat(E) xt_connmark(E) nf_conntrack(E) ip6_tables(E) iptable_mangle(E)
Jan 19 03:52:33 chef01 kernel: CPU: 1 PID: 313 Comm: Xorg.bin Tainted: G            E   4.4.0 #1
Jan 19 03:52:33 chef01 kernel: Hardware name: SI SL20/SL20, BIOS 080016  04/01/2013
Jan 19 03:52:33 chef01 kernel:  ffffffffa0174c3f ffff8800741bb990 ffffffff8075359d 0000000000000000
Jan 19 03:52:33 chef01 kernel:  ffff8800741bb9c8 ffffffff8048fa08 ffff88007ba6d0c0 ffff88007b4d43c0
Jan 19 03:52:33 chef01 kernel:  ffff88007b4d43c0 ffff880056e8d000 ffff88007b8e9000 ffff8800741bb9d8
Jan 19 03:52:33 chef01 kernel: Call Trace:
Jan 19 03:52:33 chef01 kernel:  [<ffffffff8075359d>] dump_stack+0x44/0x57
Jan 19 03:52:33 chef01 kernel:  [<ffffffff8048fa08>] warn_slowpath_common+0x88/0xc0
Jan 19 03:52:33 chef01 kernel:  [<ffffffff8048fafa>] warn_slowpath_null+0x1a/0x20
Jan 19 03:52:33 chef01 kernel:  [<ffffffffa01657b3>] kref_get.part.9+0x1e/0x27 [drm]
Jan 19 03:52:33 chef01 kernel:  [<ffffffffa0151601>] drm_framebuffer_reference+0x51/0x60 [drm]
Jan 19 03:52:33 chef01 kernel:  [<ffffffffa0161ead>] drm_atomic_set_fb_for_plane+0x2d/0x90 [drm]
Jan 19 03:52:33 chef01 kernel:  [<ffffffffa01d35e0>] __drm_atomic_helper_set_config+0xd0/0x3b0 [drm_kms_helper]
Jan 19 03:52:33 chef01 kernel:  [<ffffffffa01d4506>] restore_fbdev_mode+0x1f6/0x260 [drm_kms_helper]
Jan 19 03:52:33 chef01 kernel:  [<ffffffffa01d65e3>] drm_fb_helper_restore_fbdev_mode_unlocked+0x33/0x80 [drm_kms_helper]
Jan 19 03:52:33 chef01 kernel:  [<ffffffffa01d665c>] drm_fb_helper_set_par+0x2c/0x50 [drm_kms_helper]
Jan 19 03:52:33 chef01 kernel:  [<ffffffffa032153a>] intel_fbdev_set_par+0x1a/0x60 [i915]
Jan 19 03:52:33 chef01 kernel:  [<ffffffff807c18b1>] fb_set_var+0x191/0x400
Jan 19 03:52:33 chef01 kernel:  [<ffffffff804be317>] ? update_curr+0x67/0x130
Jan 19 03:52:33 chef01 kernel:  [<ffffffff804bcd8c>] ? __enqueue_entity+0x6c/0x70
Jan 19 03:52:33 chef01 kernel:  [<ffffffff804c13ca>] ? enqueue_entity+0x34a/0x900
Jan 19 03:52:33 chef01 kernel:  [<ffffffff807b88fc>] fbcon_blank+0x1bc/0x2b0
Jan 19 03:52:33 chef01 kernel:  [<ffffffff808410ba>] do_unblank_screen+0xba/0x1c0
Jan 19 03:52:33 chef01 kernel:  [<ffffffff8083774a>] complete_change_console+0x5a/0xe0
Jan 19 03:52:33 chef01 kernel:  [<ffffffff808386ed>] vt_ioctl+0xf1d/0x10d0
Jan 19 03:52:33 chef01 kernel:  [<ffffffff80595b82>] ? do_wp_page+0x1d2/0x4d0
Jan 19 03:52:33 chef01 kernel:  [<ffffffff80586003>] ? __inc_zone_page_state+0x33/0x40
Jan 19 03:52:33 chef01 kernel:  [<ffffffff805cb005>] ? mem_cgroup_end_page_stat+0x5/0x50
Jan 19 03:52:33 chef01 kernel:  [<ffffffffa014b8b0>] ? drm_setmaster_ioctl+0xf0/0xf0 [drm]
Jan 19 03:52:33 chef01 kernel:  [<ffffffff8082bf34>] tty_ioctl+0x3d4/0xbc0
Jan 19 03:52:33 chef01 kernel:  [<ffffffff80597995>] ? handle_mm_fault+0xca5/0x16f0
Jan 19 03:52:33 chef01 kernel:  [<ffffffff806e6867>] ? selinux_file_ioctl+0x107/0x1d0
Jan 19 03:52:33 chef01 kernel:  [<ffffffff805ee61d>] do_vfs_ioctl+0x2cd/0x4b0
Jan 19 03:52:33 chef01 kernel:  [<ffffffff806dff43>] ? security_file_ioctl+0x43/0x60
Jan 19 03:52:33 chef01 kernel:  [<ffffffff805ee879>] SyS_ioctl+0x79/0x90
Jan 19 03:52:33 chef01 kernel:  [<ffffffff80ab24f6>] entry_SYSCALL_64_fastpath+0x16/0x75
Jan 19 03:52:33 chef01 kernel: ---[ end trace 80bfc40970d49658 ]---
Comment 1 Zoltan Boszormenyi 2016-01-22 13:07:42 UTC 

*** This bug has been marked as a duplicate of bug 111011 ***