Re: [4.9-rc1+] intel_uncore builtin + CONFIG_DEBUG_TEST_DRIVER_REMOVE kernel panic

From: Jiri Olsa
Date: Wed Oct 19 2016 - 15:19:57 EST

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In reply to: CAI Qian: "[4.9-rc1+] intel_uncore builtin + CONFIG_DEBUG_TEST_DRIVER_REMOVE kernel panic"
Next in thread: CAI Qian: "Re: [4.9-rc1+] intel_uncore builtin + CONFIG_DEBUG_TEST_DRIVER_REMOVE kernel panic"
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On Wed, Oct 19, 2016 at 10:45:31AM -0400, CAI Qian wrote:
> It turns out this can only be reproducible when compiled intel_uncore as a builtin, i.e.,
> not compiled it as a module. The can still be reproduced in the yesterday's mainline.
>
> Here is some information about the system,
>
> Intel Platform: Grantley-R Wildcat Pass CPU: Broadwell-EP, B0.
> Intel(R) Xeon(R) CPU E5-2699 v4 @ 2.20GHz
>
> [ 66.349263] PCI-DMA: Using software bounce buffering for IO (SWIOTLB)
> [ 66.356672] software IO TLB [mem 0x71c7d000-0x75c7d000] (64MB) mapped at [ffff880071c7d000-ffff880075c7cfff]
> [ 66.369911] Intel CQM monitoring enabled
> [ 66.374445] Intel MBM enabled
> [ 66.385708] RAPL PMU: API unit is 2^-32 Joules, 4 fixed counters, 655360 ms ovfl timer
> [ 66.394564] RAPL PMU: hw unit of domain pp0-core 2^-14 Joules
> [ 66.400991] RAPL PMU: hw unit of domain package 2^-14 Joules
> [ 66.407317] RAPL PMU: hw unit of domain dram 2^-14 Joules
> [ 66.413358] RAPL PMU: hw unit of domain pp1-gpu 2^-14 Joules
> [ 66.434040] ================================================================================
> [ 66.443462] UBSAN: Undefined behaviour in drivers/base/core.c:1251:17
> [ 66.450653] member access within null pointer of type 'struct device'
> [ 66.457845] CPU: 68 PID: 1 Comm: swapper/0 Not tainted 4.9.0-rc1-lockfix+ #48
> [ 66.465809] Hardware name: Intel Corporation S2600WTT/S2600WTT, BIOS GRRFSDP1.86B.0271.R00.1510301446 10/30/2015
> [ 66.477168] ffff880847aff798 ffffffff81d370b4 0000000041b58ab3 ffffffff83348dcf
> [ 66.485469] ffffffff81d36ff4 ffff880847aff7c0 ffff880847aff770 ffff880e3f9d8000
> [ 66.493770] ffffffff82ff8a00 ffffffff8309c5c0 00000000000004e3 000000009091f309
> [ 66.502073] Call Trace:
> [ 66.504811] [<ffffffff81d370b4>] dump_stack+0xc0/0x12c
> [ 66.510644] [<ffffffff81d36ff4>] ? _atomic_dec_and_lock+0xc4/0xc4
> [ 66.517548] [<ffffffff81e5ac85>] ubsan_epilogue+0xd/0x8a
> [ 66.523574] [<ffffffff81e5ae68>] __ubsan_handle_type_mismatch+0x166/0x434
> [ 66.531253] [<ffffffff813294dd>] ? get_lock_stats+0x1d/0x120
> [ 66.537667] [<ffffffff81e5ad02>] ? ubsan_epilogue+0x8a/0x8a
> [ 66.543985] [<ffffffff82241acc>] device_del+0x6fc/0x860
> [ 66.549917] [<ffffffff82c8a5d2>] ? _raw_spin_unlock_irqrestore+0x42/0x70
> [ 66.557494] [<ffffffff822413d0>] ? cleanup_glue_dir+0x140/0x140
> [ 66.564202] [<ffffffff8160a6f2>] perf_pmu_unregister+0x142/0x6d0
> [ 66.571006] [<ffffffff81278cae>] ? preempt_count_sub+0x5e/0xe0
> [ 66.577619] [<ffffffff810559f7>] uncore_pmu_unregister+0x67/0xd0
> [ 66.584422] [<ffffffff8105ae6c>] uncore_pci_remove+0x32c/0x510
> [ 66.591025] [<ffffffff81ec8392>] pci_device_remove+0xb2/0x240
> [ 66.597539] [<ffffffff8224fe76>] driver_probe_device+0x146/0xfc0
> [ 66.604340] [<ffffffff82250cf0>] ? driver_probe_device+0xfc0/0xfc0
> [ 66.611334] [<ffffffff82250ea5>] __driver_attach+0x1b5/0x230
> [ 66.617749] [<ffffffff82248e60>] bus_for_each_dev+0x130/0x200
> [ 66.624264] [<ffffffff81353300>] ? do_raw_spin_trylock+0x110/0x110
> [ 66.631258] [<ffffffff82248d30>] ? subsys_dev_iter_init+0x100/0x100
> [ 66.638349] [<ffffffff81278cae>] ? preempt_count_sub+0x5e/0xe0
> [ 66.644959] [<ffffffff8224eaa2>] driver_attach+0x42/0x70
> [ 66.650976] [<ffffffff8224d846>] bus_add_driver+0x406/0x870
> [ 66.657292] [<ffffffff822535b9>] driver_register+0x1a9/0x3d0
> [ 66.663704] [<ffffffff81352942>] ? __raw_spin_lock_init+0x32/0x120
> [ 66.670700] [<ffffffff81ec2a1d>] __pci_register_driver+0x1ad/0x2b0
> [ 66.677694] [<ffffffff81ec2870>] ? pci_pm_runtime_idle+0x180/0x180
> [ 66.684694] [<ffffffff858f57b5>] intel_uncore_init+0x58d/0x64c
> [ 66.691300] [<ffffffff858ed56d>] ? amd_iommu_pc_init+0x16/0x344
> [ 66.698006] [<ffffffff858f5228>] ? uncore_type_init+0x5cb/0x5cb
> [ 66.704710] [<ffffffff81000587>] do_one_initcall+0xb7/0x2a0
> [ 66.711025] [<ffffffff810004d0>] ? initcall_blacklisted+0x1a0/0x1a0
> [ 66.718116] [<ffffffff8132687d>] ? up_write+0x7d/0x120
> [ 66.723949] [<ffffffff81326800>] ? up_read+0x40/0x40
> [ 66.729587] [<ffffffff82c8a5d2>] ? _raw_spin_unlock_irqrestore+0x42/0x70
> [ 66.737165] [<ffffffff8130db04>] ? __wake_up+0x44/0x50
> [ 66.743000] [<ffffffff858e71b9>] kernel_init_freeable+0x68a/0x768
> [ 66.749900] [<ffffffff858e6b2f>] ? start_kernel+0x751/0x751
> [ 66.756219] [<ffffffff81075ec0>] ? compat_start_thread+0xa0/0xa0
> [ 66.763013] [<ffffffff82c704c0>] ? rest_init+0x190/0x190
> [ 66.769039] [<ffffffff82c704d3>] kernel_init+0x13/0x140
> [ 66.774967] [<ffffffff82c704c0>] ? rest_init+0x190/0x190
> [ 66.780993] [<ffffffff82c8b0d7>] ret_from_fork+0x27/0x40
> [ 66.787019] ================================================================================
> [ 66.796479] kasan: CONFIG_KASAN_INLINE enabled
> [ 66.801450] kasan: GPF could be caused by NULL-ptr deref or user memory access
> [ 66.809525] general protection fault: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC KASAN
> [ 66.817878] Modules linked in:
> [ 66.821295] CPU: 68 PID: 1 Comm: swapper/0 Not tainted 4.9.0-rc1-lockfix+ #48
> [ 66.829260] Hardware name: Intel Corporation S2600WTT/S2600WTT, BIOS GRRFSDP1.86B.0271.R00.1510301446 10/30/2015
> [ 66.840618] task: ffff880e3f9d8000 task.stack: ffff880847af8000
> [ 66.847225] RIP: 0010:[<ffffffff82241466>] [<ffffffff82241466>] device_del+0x96/0x860
> [ 66.856076] RSP: 0000:ffff880847aff868 EFLAGS: 00010246
> [ 66.862002] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000
> [ 66.869967] RDX: 0000000000000000 RSI: ffffffff82ea0cc0 RDI: ffffed0108f5ff06
> [ 66.877931] RBP: ffff880847aff920 R08: ffff880e3f9d8000 R09: 0000000000000007
> [ 66.885894] R10: 0000000000000000 R11: 0000000000000006 R12: ffff880844094930
> [ 66.893859] R13: 0000000000000001 R14: ffff880844094800 R15: ffff880844095258
> [ 66.901824] FS: 0000000000000000(0000) GS:ffff880e54e00000(0000) knlGS:0000000000000000
> [ 66.910853] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [ 66.917265] CR2: 0000000000000000 CR3: 000000000360a000 CR4: 00000000003406e0
> [ 66.925228] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> [ 66.933191] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> [ 66.941154] Stack:
> [ 66.943396] ffffffff82c8a5d2 ffff881077f705c0 1ffff10108f5ff13 ffff880847aff920
> [ 66.951698] 0000000000000000 ffffffff86d346c8 0000000041b58ab3 ffffffff8338e870
> [ 66.959997] ffffffff822413d0 ffff880e00000044 ffffffff00000000 ffff880847aff8c0
> [ 66.968296] Call Trace:
> [ 66.971025] [<ffffffff82c8a5d2>] ? _raw_spin_unlock_irqrestore+0x42/0x70
> [ 66.978603] [<ffffffff822413d0>] ? cleanup_glue_dir+0x140/0x140
> [ 66.985309] [<ffffffff8160a6f2>] perf_pmu_unregister+0x142/0x6d0
> [ 66.992111] [<ffffffff81278cae>] ? preempt_count_sub+0x5e/0xe0
> [ 66.998720] [<ffffffff810559f7>] uncore_pmu_unregister+0x67/0xd0
> [ 67.005523] [<ffffffff8105ae6c>] uncore_pci_remove+0x32c/0x510
> [ 67.012131] [<ffffffff81ec8392>] pci_device_remove+0xb2/0x240
> [ 67.018641] [<ffffffff8224fe76>] driver_probe_device+0x146/0xfc0
> [ 67.025442] [<ffffffff82250cf0>] ? driver_probe_device+0xfc0/0xfc0
> [ 67.032437] [<ffffffff82250ea5>] __driver_attach+0x1b5/0x230
> [ 67.038852] [<ffffffff82248e60>] bus_for_each_dev+0x130/0x200
> [ 67.045361] [<ffffffff81353300>] ? do_raw_spin_trylock+0x110/0x110
> [ 67.052357] [<ffffffff82248d30>] ? subsys_dev_iter_init+0x100/0x100
> [ 67.059450] [<ffffffff81278cae>] ? preempt_count_sub+0x5e/0xe0
> [ 67.066056] [<ffffffff8224eaa2>] driver_attach+0x42/0x70
> [ 67.072081] [<ffffffff8224d846>] bus_add_driver+0x406/0x870
> [ 67.078397] [<ffffffff822535b9>] driver_register+0x1a9/0x3d0
> [ 67.084809] [<ffffffff81352942>] ? __raw_spin_lock_init+0x32/0x120
> [ 67.091803] [<ffffffff81ec2a1d>] __pci_register_driver+0x1ad/0x2b0
> [ 67.098798] [<ffffffff81ec2870>] ? pci_pm_runtime_idle+0x180/0x180
> [ 67.105792] [<ffffffff858f57b5>] intel_uncore_init+0x58d/0x64c
> [ 67.112399] [<ffffffff858ed56d>] ? amd_iommu_pc_init+0x16/0x344
> [ 67.119103] [<ffffffff858f5228>] ? uncore_type_init+0x5cb/0x5cb
> [ 67.125806] [<ffffffff81000587>] do_one_initcall+0xb7/0x2a0
> [ 67.132124] [<ffffffff810004d0>] ? initcall_blacklisted+0x1a0/0x1a0
> [ 67.139215] [<ffffffff8132687d>] ? up_write+0x7d/0x120
> [ 67.145046] [<ffffffff81326800>] ? up_read+0x40/0x40
> [ 67.150684] [<ffffffff82c8a5d2>] ? _raw_spin_unlock_irqrestore+0x42/0x70
> [ 67.158262] [<ffffffff8130db04>] ? __wake_up+0x44/0x50
> [ 67.164094] [<ffffffff858e71b9>] kernel_init_freeable+0x68a/0x768
> [ 67.170992] [<ffffffff858e6b2f>] ? start_kernel+0x751/0x751
> [ 67.177310] [<ffffffff81075ec0>] ? compat_start_thread+0xa0/0xa0
> [ 67.184111] [<ffffffff82c704c0>] ? rest_init+0x190/0x190
> [ 67.190137] [<ffffffff82c704d3>] kernel_init+0x13/0x140
> [ 67.196064] [<ffffffff82c704c0>] ? rest_init+0x190/0x190
> [ 67.202090] [<ffffffff82c8b0d7>] ret_from_fork+0x27/0x40
> [ 67.208115] Code: f3 f3 65 48 8b 04 25 28 00 00 00 48 89 45 d0 31 c0 48 85 ff 0f 84 69 06 00 00 48 89 da 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <80> 3c 02 00 0f 85 41 06 00 00 48 8b 03 48 89 85 68 ff ff ff 48
> [ 67.229872] RIP [<ffffffff82241466>] device_del+0x96/0x860
> [ 67.236101] RSP <ffff880847aff868>
> [ 67.240059] ---[ end trace 69358e866a1e3f6c ]---
> [ 67.245377] Kernel panic - not syncing: Fatal exception
> [ 67.251271] ---[ end Kernel panic - not syncing: Fatal exception

I think the reason here is that presume pmu devices are always added,
but we add them only if pmu_bus_running (in perf_event_sysfs_init)
is set which might happen after uncore initcall

attached patch fixes the issue for me

jirka

---
diff --git a/kernel/events/core.c b/kernel/events/core.c
index c6e47e97b33f..c2099b799d16 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -8871,8 +8871,10 @@ void perf_pmu_unregister(struct pmu *pmu)
idr_remove(&pmu_idr, pmu->type);
if (pmu->nr_addr_filters)
device_remove_file(pmu->dev, &dev_attr_nr_addr_filters);
- device_del(pmu->dev);
- put_device(pmu->dev);
+ if (pmu_bus_running) {
+ device_del(pmu->dev);
+ put_device(pmu->dev);
+ }
free_pmu_context(pmu);
}
EXPORT_SYMBOL_GPL(perf_pmu_unregister);

Next message: Steven Rostedt: "Re: [PATCH 1/3] tools lib traceevent: Add -O2 option to traceevent"
Previous message: Kirti Wankhede: "Re: [PATCH v9 12/12] docs: Sample driver to demonstrate how to use Mediated device framework."
In reply to: CAI Qian: "[4.9-rc1+] intel_uncore builtin + CONFIG_DEBUG_TEST_DRIVER_REMOVE kernel panic"
Next in thread: CAI Qian: "Re: [4.9-rc1+] intel_uncore builtin + CONFIG_DEBUG_TEST_DRIVER_REMOVE kernel panic"
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