[BUG] kdump won't work if invalid TSS fault happens in irq context

From: Xishi Qiu
Date: Wed Oct 09 2013 - 22:59:46 EST

I write a module, and find kdump can't boot in the following case.
Kernel version is 3.4.24, Intel(R) Xeon(R) CPU E5620, and kernel v3.12
has the same problem too.

Here is the code:
struct timer_list g_timer;

void tmrhnd_invtssfault(unsigned long data)
{
long __res;
printk(KERN_EMERG "invalid TSS fault in interrupt context.\n");
__asm__ volatile("int $0x0A" : "=a"(__res):);
}

{
...
init_timer(&g_timer);
g_timer.expires = jiffies + 10;
g_timer.data = 0;
g_timer.function = tmrhnd_invtssfault;
add_timer(&g_timer);
...
}

Here is the log:
[ 87.801066] kpgenm: invalid TSS fault in interrupt context.
[ 87.976956] BUG: unable to handle kernel paging request at ffffffff81467489
[ 87.983979] IP: [<ffffffff81099070>] down_read_trylock+0x10/0x20
[ 87.990017] PGD 1a0d067 PUD 1a11063 PMD 14001e1
[ 87.994708] Oops: 0003 [#1] SMP
[ 87.997985] CPU 2
[ 87.999833] Modules linked in: kpgen(O) igb(O) netmap_lin(O) megaraid_sas sr_mod mpt2sas raid_class uhci_hcd usb_storage ide_cd_mod ide_core mptctl mptsas ata_piix acpi_cpufreq mperf tg3 usbhid hid nfs lockd fscache auth_rpcgss nfs_acl sunrpc cdrom scsi_transport_sas e1000 mptscsih mptbase ipmi_devintf ipmi_msghandler ext2 ac dm_mod af_packet af_key zlib_deflate loop coretemp crc32c_intel ghash_clmulni_intel aesni_intel cryptd ipv6 aes_x86_64 aes_generic pcspkr i2c_i801 mei(C) sg iTCO_wdt microcode iTCO_vendor_support dca rtc_cmos container ext3 jbd mbcache i915 drm_kms_helper drm i2c_algo_bit i2c_core sd_mod crc_t10dif ahci libahci ehci_hcd libata button usbcore usb_common thermal video fan intel_agp intel_gtt processor thermal_sys hwmon scsi_dh_rdac scsi_dh_alua scsi_dh_emc scsi_dh_hp_sw scsi_dh scsi_mod [last unloaded: igb]
[ 88.075236]
[ 88.076738] Pid: 1417644280, comm: ÔF.??? Tainted: G C O 3.4.24.13-0.1-default #1 INSYDE eChiefRiver/Type2 - Board Product Name1
[ 88.089319] RIP: 0010:[<ffffffff81099070>] [<ffffffff81099070>] down_read_trylock+0x10/0x20
[ 88.097783] RSP: 0018:ffff8802547fbc88 EFLAGS: 00010002
[ 88.103101] RAX: 4c10246c894c1824 RBX: 0000000000000001 RCX: ffffffff81467429
[ 88.110238] RDX: 4c10246c894c1825 RSI: 0000000000000010 RDI: ffffffff81467489
[ 88.117373] RBP: ffff8802547fbc88 R08: ffff8802547fbfd8 R09: 0000000000000000
[ 88.124511] R10: ffff88025f28dc50 R11: 0000000000000000 R12: 0000000000000001
[ 88.131648] R13: 0000000000000010 R14: ffff8802547fbda8 R15: 0000000000000028
[ 88.138786] FS: 0000000000000000(0000) GS:ffff88025f280000(0000) knlGS:0000000000000000
[ 88.146876] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[ 88.152626] CR2: ffffffff81467489 CR3: 0000000001a0b000 CR4: 00000000001407e0
[ 88.159764] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 88.166901] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[ 88.174039] Process ÔF.??? (pid: 1417644280, threadinfo ffff8802547fa000, task ffff8802547f8440)
[ 88.183082] Stack:
[ 88.185101] ffff8802547fbd98 ffffffff8146aa24 ffffffffa02ca194 ffffffff81467489
[ 88.192601] ffff8802547f8440 ffffffff81467429 ffff8802547fbe78 ffffffff814675f5
[ 88.200084] 0000000000000028 ffff8802547fbe88 0000000000000000 ffffffffa02ca194
[ 88.207571] Call Trace:
[ 88.210031] [<ffffffff8146aa24>] do_page_fault+0x184/0x4b0
[ 88.215617] [<ffffffffa02ca194>] ? tmrhnd_invtssfault+0x14/0x20 [kpgen]
[ 88.222327] [<ffffffff81467489>] ? retint_signal+0x25/0x8c
[ 88.227901] [<ffffffff81467429>] ? restore_args+0x30/0x30
[ 88.233390] [<ffffffff814675f5>] ? page_fault+0x25/0x30
[ 88.238706] [<ffffffffa02ca194>] ? tmrhnd_invtssfault+0x14/0x20 [kpgen]
[ 88.245411] [<ffffffffa02ca194>] ? tmrhnd_invtssfault+0x14/0x20 [kpgen]
[ 88.252112] [<ffffffff81467429>] ? restore_args+0x30/0x30
[ 88.257604] [<ffffffff8146a8d4>] ? do_page_fault+0x34/0x4b0
[ 88.263265] [<ffffffff814675f5>] page_fault+0x25/0x30
[ 88.268408] [<ffffffffa02ca194>] ? tmrhnd_invtssfault+0x14/0x20 [kpgen]
[ 88.275110] [<ffffffff814675f5>] ? page_fault+0x25/0x30
[ 88.280427] [<ffffffffa02ca194>] ? tmrhnd_invtssfault+0x14/0x20 [kpgen]
[ 88.287130] [<ffffffffa02ca194>] ? tmrhnd_invtssfault+0x14/0x20 [kpgen]
[ 88.293835] [<ffffffff81467429>] ? restore_args+0x30/0x30
[ 88.299322] [<ffffffff8146a8d4>] ? do_page_fault+0x34/0x4b0
[ 88.304987] [<ffffffff8145c19e>] ? start_secondary+0x7a/0x7c
[ 88.310733] Code: c0 83 fa 01 5b 0f 94 c0 41 5c c9 c3 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 55 48 89 e5 48 8b 07 48 89 c2 48 83 c2 01 7e 07 <f0> 48 0f b1 17 75 f0 48 f7 d0 c9 48 c1 e8 3f c3 55 31 c0 48 ba
[ 88.330974] RIP [<ffffffff81099070>] down_read_trylock+0x10/0x20
[ 88.337097] RSP <ffff8802547fbc88>
[ 88.340590] CR2: ffffffff81467489
[ 88.343921] BUG: unable to handle kernel paging request at ffffffff81467489
[ 88.350926] IP: [<ffffffff81099070>] down_read_trylock+0x10/0x20
[ 88.356962] PGD 1a0d067 PUD 1a11063 PMD 14001e1
[ 88.361664] Oops: 0003 [#2] SMP
[ 88.364940] CPU 2
[ 88.366788] Modules linked in: kpgen(O) igb(O) netmap_lin(O) megaraid_sas sr_mod mpt2sas raid_class uhci_hcd usb_storage ide_cd_mod ide_core mptctl mptsas ata_piix acpi_cpufreq mperf tg3 usbhid hid nfs lockd fscache auth_rpcgss nfs_acl sunrpc cdrom scsi_transport_sas e1000 mptscsih mptbase ipmi_devintf ipmi_msghandler ext2 ac dm_mod af_packet af_key zlib_deflate loop coretemp crc32c_intel ghash_clmulni_intel aesni_intel cryptd ipv6 aes_x86_64 aes_generic pcspkr i2c_i801 mei(C) sg iTCO_wdt microcode iTCO_vendor_support dca rtc_cmos container ext3 jbd mbcache i915 drm_kms_helper drm i2c_algo_bit i2c_core sd_mod crc_t10dif ahci libahci ehci_hcd libata button usbcore usb_common thermal video fan intel_agp intel_gtt processor thermal_sys hwmon scsi_dh_rdac scsi_dh_alua scsi_dh_emc scsi_dh_hp_sw scsi_dh scsi_mod [last unloaded: igb]
[ 88.442070]
[ 88.443570] Pid: 1417644280, comm: ÔF.??? Tainted: G C O 3.4.24.13-0.1-default #1 INSYDE eChiefRiver/Type2 - Board Product Name1
[ 88.456162] RIP: 0010:[<ffffffff81099070>] [<ffffffff81099070>] down_read_trylock+0x10/0x20
[ 88.464628] RSP: 0018:ffff8802547fb588 EFLAGS: 00010002
[ 88.469943] RAX: 4c10246c894c1824 RBX: 0000000000000001 RCX: ffffffff81467429
[ 88.477080] RDX: 4c10246c894c1825 RSI: 0000000000000000 RDI: ffffffff81467489
[ 88.484216] RBP: ffff8802547fb588 R08: 00000000000000d0 R09: 0000000000000000
[ 88.491355] R10: ffffffff81abb680 R11: 0000000000000000 R12: 0000000000000018
[ 88.498493] R13: 0000000000000000 R14: ffff8802547fb6a8 R15: 0000000000000028
[ 88.505630] FS: 0000000000000000(0000) GS:ffff88025f280000(0000) knlGS:0000000000000000
[ 88.513721] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[ 88.519469] CR2: ffffffff81467489 CR3: 0000000001a0b000 CR4: 00000000001407e0
[ 88.526607] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 88.533745] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[ 88.540881] Process ÔF.??? (pid: 1417644280, threadinfo ffff8802547fa000, task ffff8802547f8440)
[ 88.549924] Stack:
[ 88.551945] ffff8802547fb698 ffffffff8146aa24 ffff8802547fb608 ffffffff81467489
[ 88.559446] ffff8802547f8440 ffffffff81467429 ffff8802d47fb6e8 547fb6e900000041
[ 88.566937] ffffffff6c106009 0000000000040000 ffff8802547fb608 ffff8802547fb6d8
[ 88.574438] Call Trace:
[ 88.576898] [<ffffffff8146aa24>] do_page_fault+0x184/0x4b0
[ 88.582474] [<ffffffff81467489>] ? retint_signal+0x25/0x8c
[ 88.588050] [<ffffffff81467429>] ? restore_args+0x30/0x30
[ 88.593545] [<ffffffff81255d80>] ? sprintf+0x40/0x50
[ 88.598604] [<ffffffff810a573d>] ? kallsyms_lookup+0xdd/0x100
[ 88.604442] [<ffffffff814675f5>] page_fault+0x25/0x30
[ 88.609586] [<ffffffff8114f78e>] ? cache_alloc_refill+0x5e/0x290
[ 88.615691] [<ffffffff8115086d>] __kmalloc_track_caller+0x24d/0x260
[ 88.622056] [<ffffffff81005a9d>] ? register_nmi_handler+0x8d/0x170
[ 88.628337] [<ffffffff81120690>] kstrndup+0x40/0x80
[ 88.633314] [<ffffffff81021570>] ? machine_crash_shutdown+0x10/0x10
[ 88.639676] [<ffffffff81005a9d>] register_nmi_handler+0x8d/0x170
[ 88.645780] [<ffffffff81467489>] ? retint_signal+0x25/0x8c
[ 88.651356] [<ffffffff81467489>] ? retint_signal+0x25/0x8c
[ 88.656935] [<ffffffff810216ba>] nmi_shootdown_cpus+0x5a/0xc0
[ 88.662780] [<ffffffff8102a230>] native_machine_crash_shutdown+0x40/0x1a0
[ 88.669665] [<ffffffff810a686a>] ? append_elf_note+0x7a/0xa0
[ 88.675423] [<ffffffff81467489>] ? retint_signal+0x25/0x8c
[ 88.681008] [<ffffffff81467489>] ? retint_signal+0x25/0x8c
[ 88.686592] [<ffffffff8102156a>] machine_crash_shutdown+0xa/0x10
[ 88.692697] [<ffffffff810a6ec7>] crash_kexec+0x57/0x100 // kdump will boot soon, but it failed, right?
[ 88.698021] [<ffffffff81467429>] ? restore_args+0x30/0x30
[ 88.703518] [<ffffffff81467489>] ? retint_signal+0x25/0x8c
[ 88.709095] [<ffffffff81099070>] ? down_read_trylock+0x10/0x20
[ 88.715029] [<ffffffff81468178>] oops_end+0xb8/0xf0
[ 88.720008] [<ffffffff810325a9>] no_context+0x119/0x200
[ 88.725329] [<ffffffff81467489>] ? retint_signal+0x25/0x8c
[ 88.730915] [<ffffffff810327bd>] __bad_area_nosemaphore+0x12d/0x220
[ 88.737280] [<ffffffff81467489>] ? retint_signal+0x25/0x8c
[ 88.742866] [<ffffffff810328be>] bad_area_nosemaphore+0xe/0x10
[ 88.748797] [<ffffffff8146a9a0>] do_page_fault+0x100/0x4b0
[ 88.754380] [<ffffffff81467489>] ? retint_signal+0x25/0x8c
[ 88.759967] [<ffffffff81467429>] ? restore_args+0x30/0x30
[ 88.765463] [<ffffffff814675f5>] ? page_fault+0x25/0x30

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