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Date: Thu, 9 Aug 2012 17:36:22 +0800 From: Jiang Liu <jiang.liu@...wei.com> To: Tang Chen <tangchen@...fujitsu.com> CC: Yinghai Lu <yinghai@...nel.org>, Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>, Kenji Kaneshige <kaneshige.kenji@...fujitsu.com>, Wen Congyang <wency@...fujitsu.com>, Taku Izumi <izumi.taku@...fujitsu.com>, Tony Luck <tony.luck@...el.com>, Huang Ying <ying.huang@...el.com>, Bob Moore <robert.moore@...el.com>, Len Brown <lenb@...nel.org>, "Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>, Bjorn Helgaas <bhelgaas@...gle.com>, <linux-kernel@...r.kernel.org>, <linux-acpi@...r.kernel.org>, <linux-pci@...r.kernel.org>, Jiang Liu <liuj97@...il.com>, Hanjun Guo <guohanjun@...wei.com> Subject: Re: [RFC PATCH v2 10/16] ACPIHP: system device hotplug driver skeleton On 2012-8-9 16:41, Tang Chen wrote: > Hi Liu ~ > > On 08/09/2012 03:40 PM, Jiang Liu wrote: >> Hi Tang, >> Thanks for testing. >> Currently there's a limitation that you need to insert acpihp_enum driver first. > > Sorry, I didn't make it clear. I did load acpihp_enum module first, and then load acpihp_drv. > > And I just tried it some more times. It just hung up, but dmesg had no output. > Like this: > > # modprobe acpihp_enum > (OK, and sysfs interfaces have been created) > # modprobe acpihp_drv > (hang up) > > # dmesg > (nothing) > > The "modprobe acpihp_drv" process's call trace shows that it hung at the following function: > #0 0x00000032836aab80 in __nanosleep_nocancel () from /lib64/libc.so.6 > #1 0x00000032836deb64 in usleep () from /lib64/libc.so.6 > ...... > > I have tried several times and I cannot reproduce the situation I just said. You can reproduce it by loading acpihp_drv without acpihp_enum driver, I guess. The acpihp_drv module_init() should call acpihp_register_class() to initialize the core. > Maybe my box has something different with yours. And I'll try to find out why. > > Thanks for your advice. :) > >> Will fix this issue in next version. >> Regards! >> Gerry >> >> On 2012-8-9 15:12, Tang Chen wrote: >>> Hi Liu~ >>> >>> I compiled this driver as a module, acpihp_drv. And when I loaded this module, it >>> gave the following error message: >>> >>> # modprobe acpihp_drv >>> (the command hangs up, no return after 10 min) >>> >>> #dmesg >>> ...... >>> [ 126.643350] BUG: unable to handle kernel NULL pointer dereference at 0000000000000078 >>> [ 126.644007] IP: [<ffffffff814c0cd3>] mutex_lock+0x19/0x37 >>> [ 126.644007] PGD 105277a067 PUD 104f823067 PMD 0 >>> [ 126.644007] Oops: 0002 [#1] SMP >>> [ 126.644007] Modules linked in: acpihp_drv(+) ebtable_nat ebtables ipt_MASQUERADE iptable_nat nf_nat iptable_mangle bridge stp llc sunrpc cpufreq_ondemand acpi_cpufreq freq_table mperf ip6t_REJECT nf_conntrack_ipv6 nf_defrag_ipv6 ip6table_filter ip6_tables ipv6 vhost_net macvtap macvlan tun uinput iTCO_wdt iTCO_vendor_support coretemp kvm_intel kvm crc32c_intel microcode lpc_ich mfd_core pcspkr i2c_i801 i2c_core ioatdma e1000e acpi_memhotplug i7core_edac edac_core igb dca mptsas mptscsih mptbase scsi_transport_sas >>> [ 126.644007] CPU 10 >>> [ 126.644007] Pid: 2821, comm: modprobe Tainted: G A 3.6.0-rc1+ #6 FUJITSU-SV PRIMEQUEST 1800E/SB >>> [ 126.644007] RIP: 0010:[<ffffffff814c0cd3>] [<ffffffff814c0cd3>] mutex_lock+0x19/0x37 >>> [ 126.644007] RSP: 0018:ffff8810589a9de8 EFLAGS: 00010246 >>> [ 126.644007] RAX: 0000000000000000 RBX: 0000000000000078 RCX: 0000000000000000 >>> [ 126.644007] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000078 >>> [ 126.644007] RBP: ffff8810589a9e08 R08: 0000000000000000 R09: ffff8810589a9d88 >>> [ 126.644007] R10: 00000000000013e5 R11: 00000000000013e5 R12: ffffffffa01460d0 >>> [ 126.644007] R13: 0000000000000000 R14: ffffffffa014732b R15: 00000000000000bf >>> [ 126.644007] FS: 00007fecb1802700(0000) GS:ffff88105e640000(0000) knlGS:0000000000000000 >>> [ 126.644007] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 >>> [ 126.644007] CR2: 0000000000000078 CR3: 0000001052772000 CR4: 00000000000007e0 >>> [ 126.644007] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 >>> [ 126.644007] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 >>> [ 126.644007] Process modprobe (pid: 2821, threadinfo ffff8810589a8000, task ffff8810592f8000) >>> [ 126.644007] Stack: >>> [ 126.644007] ffff8810589a9e08 ffffffff810be37f ffffffffa0146220 ffffffff81a7b390 >>> [ 126.644007] ffff8810589a9e58 ffffffff81317eb3 ffff8810589a9e48 0000000000000000 >>> [ 126.644007] ffffffff81a342c0 ffffffff81a342e0 0000000000000000 ffffffffa0146220 >>> [ 126.644007] Call Trace: >>> [ 126.644007] [<ffffffff810be37f>] ? tracepoint_module_notify+0xd9/0x14a >>> [ 126.644007] [<ffffffff81317eb3>] class_interface_register+0x4a/0xbc >>> [ 126.644007] [<ffffffffa00b8000>] ? 0xffffffffa00b7fff >>> [ 126.644007] [<ffffffffa00b8010>] acpihp_drv_init+0x10/0x12 [acpihp_drv] >>> [ 126.644007] [<ffffffff8100207f>] do_one_initcall+0x7f/0x139 >>> [ 126.644007] [<ffffffff81093414>] sys_init_module+0x12d3/0x14e3 >>> [ 126.644007] [<ffffffff81264b0d>] ? ddebug_dyndbg_boot_param_cb+0x45/0x45 >>> [ 126.644007] [<ffffffff814c9469>] system_call_fastpath+0x16/0x1b >>> [ 126.644007] Code: 48 8b 04 25 80 c6 00 00 48 89 43 18 31 c0 5b 5b c9 c3 55 48 89 e5 53 48 83 ec 18 66 66 66 66 90 48 89 fb e8 5a 0c 00 00 48 89 df <f0> ff 0f 79 05 e8 06 ff ff ff 65 48 8b 04 25 80 c6 00 00 48 89 >>> [ 126.644007] RIP [<ffffffff814c0cd3>] mutex_lock+0x19/0x37 >>> [ 126.644007] RSP <ffff8810589a9de8> >>> [ 126.644007] CR2: 0000000000000078 >>> [ 129.981335] ---[ end trace da17e9c9de8dd560 ]--- >>> [ 139.085895] nr_pdflush_threads exported in /proc is scheduled for removal >>> [ 139.167394] sysctl: The scan_unevictable_pages sysctl/node-interface has been disabled for lack of a legitimate use case. If you have one, please send an email to linux-mm@...ck.org. >>> >>> Looks like it dereferenced a NULL pointer here. >>> May be it was my mistake that I didn't configure the environment correctly. >>> Would you please give me some advice ? >>> >>> Thanks. :) >>> >>> > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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