> if you managed to trigger it that reliably, could you revert
> slub_delay_ctor_on_rt.patch in the queue and try again?
>
Over the weekend I ran a test that rebooted the PC permanently.
After about 400 reboots I got another NULL pointer dereference.
However the slub_delay_ctor_on_rt.patch has not been reverted yet.
And: This looks somehow differently than the previous BUGs.
[ 3.299329] BUG: unable to handle kernel NULL pointer dereference at 0000008c
[ 3.299332] IP: [<c10df66c>] function_trace_call+0xc/0x190
[ 3.299334] *pde = 00000000
[ 3.299336] Oops: 0000 [#1] PREEMPT SMP
[ 3.299356] Modules linked in: e1000(+) kvm_intel kvm pcspkr psmouse i2c_i801 radeon(+) drm_kms_helper ttm drm agpgart e1000e igb i2c_algo_bit i2c_core ixgbe mdio ptp pps_core dca parport_pc parport video backlight acpi_cpufreq processor coretemp autofs4 reiserfs microcode sg sd_mod ahci libahci ehci_pci ehci_hcd xhci_pci xhci_hcd fan thermal_sys hwmon
[ 3.299358] CPU: 0 PID: 1447 Comm: systemd-udevd Not tainted 3.18.13-rt10-2 #1
[ 3.299359] Hardware name: LENOVO 32282Z8/MAHOBAY, BIOS 9SKT70AUS 06/07/2013
[ 3.299360] task: eb76ec00 ti: eae30000 task.ti: eae30000
[ 3.299361] EIP: 0060:[<c10df66c>] EFLAGS: 00010282 CPU: 0
[ 3.299362] EIP is at function_trace_call+0xc/0x190
[ 3.299363] EAX: c1068fe7 EBX: 00000000 ECX: c1633f80 EDX: c11f5e6c
[ 3.299364] ESI: 060dbc0e EDI: 0033c321 EBP: eae31b3c ESP: eae31b20
[ 3.299365] DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068
[ 3.299366] CR0: 80050033 CR2: 0000008c CR3: 2ac3b000 CR4: 001407d0
[ 3.299367] Stack:
[ 3.299371] c1068fec c160007b c11f007b c11f00d8 06328cee 060dbc0e 0033c321 eae31b6c
[ 3.299375] c14067da 00000000 80000001 00000000 00000001 c1068fec c1063f3b 060dbc0e
[ 3.299380] 0033c321 eae31b6c 06328cee eae31b88 c11f5e6c eae31fec 00000000 00000027
[ 3.299380] Call Trace:
[ 3.299384] [<c1068fec>] ? preempt_count_add+0xc/0xa0
[ 3.299387] [<c11f007b>] ? radix_tree_tag_clear+0x1b/0x110
[ 3.299389] [<c11f00d8>] ? radix_tree_tag_clear+0x78/0x110
[ 3.299393] [<c14067da>] ftrace_call+0x5/0xb
[ 3.299395] [<c1068fec>] ? preempt_count_add+0xc/0xa0
[ 3.299397] [<c1063f3b>] ? preempt_count_sub+0xb/0xd0
[ 3.299400] [<c11f5e6c>] delay_tsc+0x5c/0xf0
[ 3.299402] [<c11f5dae>] __const_udelay+0x1e/0x20
[ 3.299428] [<f0369f82>] evergreen_set_uvd_clocks+0x302/0x360 [radeon]
[ 3.299450] [<f03e3250>] uvd_v1_0_init+0x70/0x5a0 [radeon]
[ 3.299471] [<f0371339>] evergreen_startup+0x659/0x670 [radeon]
[ 3.299489] [<f03715b5>] evergreen_init+0x1c5/0x380 [radeon]
[ 3.299504] [<f02fa4e2>] radeon_device_init+0xba2/0xd70 [radeon]
[ 3.299518] [<f02f8400>] ? cail_mc_write+0x20/0x20 [radeon]
[ 3.299533] [<f02fc9ba>] radeon_driver_load_kms+0x8a/0x200 [radeon]
[ 3.299541] [<f007f7de>] drm_dev_register+0x8e/0xd0 [drm]
[ 3.299548] [<f0082389>] drm_get_pci_dev+0x79/0x1d0 [drm]
[ 3.299550] [<c113b24a>] ? kfree+0x1ba/0x1d0
[ 3.299564] [<f02f834e>] ? radeon_pci_probe+0x6e/0xa0 [radeon]
[ 3.299576] [<f02f834e>] ? radeon_pci_probe+0x6e/0xa0 [radeon]
[ 3.299590] [<f02f835c>] radeon_pci_probe+0x7c/0xa0 [radeon]
[ 3.299593] [<c121ac8f>] pci_device_probe+0x6f/0xd0
[ 3.299595] [<c11a25e5>] ? sysfs_create_link+0x25/0x50
[ 3.299598] [<c12c7a7f>] driver_probe_device+0x7f/0x3d0
[ 3.299600] [<c1069580>] ? migrate_enable+0x80/0x180
[ 3.299602] [<c121abb7>] ? pci_match_device+0xd7/0x110
[ 3.299605] [<c12c7e89>] __driver_attach+0x79/0x80
[ 3.299607] [<c12c7e10>] ? __device_attach+0x40/0x40
[ 3.299609] [<c12c5d9f>] bus_for_each_dev+0x4f/0x80
[ 3.299611] [<c12c758e>] driver_attach+0x1e/0x20
[ 3.299613] [<c12c7e10>] ? __device_attach+0x40/0x40
[ 3.299615] [<c12c71f7>] bus_add_driver+0x167/0x240
[ 3.299617] [<f0458000>] ? 0xf0458000
[ 3.299619] [<f0458000>] ? 0xf0458000
[ 3.299621] [<c12c864d>] driver_register+0x5d/0xf0
[ 3.299623] [<c121946f>] __pci_register_driver+0x5f/0x70
[ 3.299629] [<f00825bd>] drm_pci_init+0xdd/0x100 [drm]
[ 3.299632] [<f0458000>] ? 0xf0458000
[ 3.299645] [<f045808d>] radeon_init+0x8d/0xa8 [radeon]
[ 3.299647] [<c100044e>] do_one_initcall+0xae/0x1e0
[ 3.299649] [<f0458000>] ? 0xf0458000
[ 3.299651] [<c113b24a>] ? kfree+0x1ba/0x1d0
[ 3.299653] [<c112dca5>] ? __vunmap+0xa5/0xf0
[ 3.299654] [<c112dca5>] ? __vunmap+0xa5/0xf0
[ 3.299657] [<c112dca5>] ? __vunmap+0xa5/0xf0
[ 3.299661] [<c10b6a5b>] load_module+0x199b/0x21e0
[ 3.299669] [<c10b73fd>] SyS_finit_module+0x7d/0xc0
[ 3.299672] [<c1080abd>] ? rt_up_write+0xd/0x10
[ 3.299678] [<c1405c54>] sysenter_do_call+0x12/0x12
[ 3.299712] Code: 85 c0 74 0f 83 f8 ff 74 05 83 e8 01 89 03 e8 6c 4c ff ff 5b 5d c3 89 f6 8d bc 27 00 00 00 00 55 89 e5 57 56 53 83 ec 10 8b 59 0c <8b> 8b 8c 00 00 00 85 c9 74 6e 89 45 ec 89 d6 64 a1 d0 f6 6b c1
[ 3.299714] EIP: [<c10df66c>] function_trace_call+0xc/0x190 SS:ESP 0068:eae31b20
[ 3.299715] CR2: 000000000000008c
[ 3.735916] e1000 0000:04:0a.0: Receive Absolute Interrupt Delay set to 0
[ 3.742722] e1000 0000:04:0a.0: Interrupt Throttling Rate (ints/sec) turned off
[ 3.775061] ---[ end trace 0000000000000002 ]---
I will try again with a reverted slub_delay_ctor_on_rt.patch.
Regards
Mathias
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