linux-kernel - Re: kasan inline + CONFIG_DEBUG_TEST_DRIVER

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Date:   Mon, 10 Oct 2016 16:09:45 -0400 (EDT)
From:   CAI Qian <caiqian@...hat.com>
To:     Rob Herring <robh@...nel.org>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: kasan inline + CONFIG_DEBUG_TEST_DRIVER_REMOVE kernel panic


> Is the backtrace the same in that case?
Very close. I saw "intel" there, and here is the list those modules on the system.

# lsmod | grep intel
intel_rapl             20480  0 
intel_powerclamp       16384  0 
kvm_intel             208896  0 
kvm                   630784  1 kvm_intel
ghash_clmulni_intel    16384  0 
aesni_intel           167936  0 
lrw                    16384  1 aesni_intel
glue_helper            16384  1 aesni_intel
ablk_helper            16384  1 aesni_intel
cryptd                 24576  3 ablk_helper,ghash_clmulni_intel,aesni_intel
crc32c_intel           24576  1

[   17.884926] BUG: unable to handle kernel NULL pointer dereference at           (null)
[   17.893700] IP: [<ffffffff81546ff7>] device_del+0x17/0x280
[   17.899848] PGD 0 
[   17.902109] Oops: 0000 [#1] PREEMPT SMP
[   17.906394] Modules linked in:
[   17.909823] CPU: 68 PID: 1 Comm: swapper/0 Not tainted 4.8.0-remove-nokasan+ #5
[   17.917985] Hardware name: Intel Corporation S2600WTT/S2600WTT, BIOS GRRFSDP1.86B.0271.R00.1510301446 10/30/2015
[   17.929347] task: ffff8810556c8000 task.stack: ffffc90000078000
[   17.935955] RIP: 0010:[<ffffffff81546ff7>]  [<ffffffff81546ff7>] device_del+0x17/0x280
[   17.944811] RSP: 0000:ffffc9000007bc00  EFLAGS: 00010286
[   17.950742] RAX: 0000000000000000 RBX: ffff88085c8e3c00 RCX: 0000000000000001
[   17.958708] RDX: ffff881059d60000 RSI: 000000000000000b RDI: 0000000000000000
[   17.966675] RBP: ffffc9000007bc38 R08: 00000000d38c0f63 R09: 0000000000000000
[   17.974640] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
[   17.982606] R13: ffff881054099000 R14: 0000000000000001 R15: 0000000000000000
[   17.990574] FS:  0000000000000000(0000) GS:ffff88105e400000(0000) knlGS:0000000000000000
[   17.999606] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   18.006022] CR2: 0000000000000000 CR3: 0000000001c06000 CR4: 00000000003406e0
[   18.013989] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   18.021954] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   18.029919] Stack:
[   18.032163]  0000000000000000 00000000dd652bd0 ffff88085c8e3c00 ffff88085c8e3c00
[   18.040475]  ffff88085c8e3400 ffff881054099000 0000000000000001 ffffc9000007bc58
[   18.048788]  ffffffff811c9680 ffff88085c8e3c00 ffff88085c8e3400 ffffc9000007bc88
[   18.057090] Call Trace:
[   18.059819]  [<ffffffff811c9680>] perf_pmu_unregister+0x90/0x150
[   18.066529]  [<ffffffff81017678>] uncore_pci_remove+0xc8/0x160
[   18.073044]  [<ffffffff814428c9>] pci_device_remove+0x39/0xc0
[   18.079468]  [<ffffffff8154bf4e>] driver_probe_device+0xbe/0x4d0
[   18.086176]  [<ffffffff8154c443>] __driver_attach+0xe3/0xf0
[   18.092399]  [<ffffffff8154c360>] ? driver_probe_device+0x4d0/0x4d0
[   18.099400]  [<ffffffff81549b43>] bus_for_each_dev+0x73/0xc0
[   18.105722]  [<ffffffff8154b7de>] driver_attach+0x1e/0x20
[   18.111752]  [<ffffffff8154b290>] bus_add_driver+0x200/0x270
[   18.118078]  [<ffffffff8154d160>] driver_register+0x60/0xe0
[   18.124303]  [<ffffffff81440ee0>] __pci_register_driver+0x60/0x70
[   18.131117]  [<ffffffff81f1e6e1>] intel_uncore_init+0x277/0x2df
[   18.137728]  [<ffffffff81f1e46a>] ? uncore_type_init+0x15f/0x15f
[   18.144441]  [<ffffffff81002190>] do_one_initcall+0x50/0x190
[   18.150768]  [<ffffffff810c5bf1>] ? parse_args+0x2d1/0x490
[   18.156894]  [<ffffffff81f19243>] kernel_init_freeable+0x1ff/0x29e
[   18.163801]  [<ffffffff817dd840>] ? rest_init+0x140/0x140
[   18.169831]  [<ffffffff817dd84e>] kernel_init+0xe/0x100
[   18.175668]  [<ffffffff817e957a>] ret_from_fork+0x2a/0x40
[   18.181695] Code: e8 cf d4 29 00 5b 5d c3 66 90 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 55 48 89 e5 41 56 41 55 41 54 53 49 89 fc 48 83 ec 18 <4c> 8b 2f 65 48 8b 04 25 28 00 00 00 48 89 45 d8 31 c0 48 8b 87 
[   18.203631] RIP  [<ffffffff81546ff7>] device_del+0x17/0x280
[   18.209867]  RSP <ffffc9000007bc00>
[   18.213759] CR2: 0000000000000000
[   18.217548] ---[ end trace 91188545987fc9d9 ]---
[   18.222706] Kernel panic - not syncing: Fatal exception
[   18.228692] ---[ end Kernel panic - not syncing: Fatal exception