WARN_ON causes recursive unwind panic
From: Stephen Hemminger
Date: Wed Aug 02 2006 - 17:58:05 EST
A simple WARN_ON tripped but the dwarf unwinder in 2.6.18-rc3 on x86_64
made it a panic by recursively gagging on itself.
[ 4202.444190] BUG: warning at net/sched/sch_htb.c:397/htb_safe_rb_erase()
[ 4202.463979]
[ 4202.463980] Call Trace:
[ 4202.475889] [<ffffffff8100ae89>] show_trace+0xae/0x31f
[ 4202.491521] [<ffffffff8100b10f>] dump_stack+0x15/0x17
[ 4202.506902] [<ffffffff88130171>] :sch_htb:htb_safe_rb_erase+0x3b/0x55
[ 4202.526421] [<ffffffff881304d6>] :sch_htb:htb_deactivate_prios+0x174/0x1ce
[ 4202.547254] [<ffffffff8813149e>] :sch_htb:htb_dequeue+0x4ef/0x88a
[ 4202.547261] [<ffffffff811fac3d>] __qdisc_run+0x41/0x1e5
[ 4202.582173] [<ffffffff811eee34>] dev_queue_xmit+0x134/0x258
[ 4202.599608] [<ffffffff81229d00>] arp_xmit+0x4e/0x50
[ 4202.614998] [<ffffffff8122a6de>] arp_send+0x28/0x2a
[ 4202.630372] [<ffffffff8122afce>] arp_solicit+0x19a/0x1ab
[ 4202.647046] [<ffffffff811f4d3e>] neigh_timer_handler+0x31f/0x361
[ 4202.665764] [<ffffffff8103440e>] run_timer_softirq+0x147/0x1d0
[ 4202.683541] [<ffffffff81030bc0>] __do_softirq+0x67/0xf4
[ 4202.699506] [<ffffffff8100ab66>] call_softirq+0x1e/0x28
[ 4202.715402] DWARF2 unwinder stuck at call_softirq+0x1e/0x28
[ 4202.732064] Leftover inexact backtrace:
[ 4202.743542] <IRQ> [<ffffffff8100c0a6>] do_softirq+0x39/0x9f
[ 4202.760533] [<ffffffff81030b4d>] irq_exit+0x4e/0x5a
[ 4202.775389] [<ffffffff81014e38>] smp_apic_timer_interrupt+0x54/0x58
[ 4202.794399] [<ffffffff81008783>] default_idle+0x0/0x69
[ 4202.810035] [<ffffffff8100a4da>] apic_timer_interrupt+0x6a/0x70
[ 4202.828005] <EOI> [<ffffffff810037f1>] level3_kernel_pgt+0x7f1/0x1000
[ 4203.123107] [<ffffffff81007ed8>] do_arch_prctl+0x269/0x3a9
[ 4203.143835] [<ffffffff81004003>] level2_ident_pgt+0x3/0xa0
[ 4203.309028] [<ffffffff81004005>] level2_ident_pgt+0x5/0xa0
[ 4203.326018] [<ffffffff81004005>] level2_ident_pgt+0x5/0xa0
[ 4203.342840] [<ffffffff81004005>] level2_ident_pgt+0x5/0xa0
[ 4203.359668] [<ffffffff81004005>] level2_ident_pgt+0x5/0xa0
[ 4203.376499] [<ffffffff81004005>] level2_ident_pgt+0x5/0xa0
[ 4203.393318] [<ffffffff81004005>] level2_ident_pgt+0x5/0xa0
[ 4203.437207] [<ffffffff81006485>] level3_physmem_pgt+0x485/0x1000
[ 4203.455425] [<ffffffff81007bc6>] dump_task_regs+0x162/0x19c
[ 4203.484531] [<ffffffff810062ad>] level3_physmem_pgt+0x2ad/0x1000
[ 4203.517836] [<ffffffff810061a2>] level3_physmem_pgt+0x1a2/0x1000
[ 4203.536089] [<ffffffff81002db8>] level3_ident_pgt+0xdb8/0x1000
[ 4203.553953] [<ffffffff81007ec9>] do_arch_prctl+0x25a/0x3a9
[ 4203.570670] [<ffffffff81007f16>] do_arch_prctl+0x2a7/0x3a9
[ 4203.589997] [<ffffffff81007ee1>] do_arch_prctl+0x272/0x3a9
[ 4204.103898] Unable to handle kernel paging request at ffffffff82800000 RIP:
[ 4204.117720] [<ffffffff8100b095>] show_trace+0x2ba/0x31f
[ 4204.140990] PGD 1003027 PUD 1005027 PMD 0
[ 4204.153404] Oops: 0000 [1] PREEMPT SMP
[ 4204.165041] CPU 0
[ 4204.171117] Modules linked in: cls_u32 sch_sfq sch_red sch_htb ipv6 autofs4 sunrpc binfmt_misc video thermal processor fan button battery asus_acpi ac tcp_cubic sg ehci_hcd ohci_hcd i2c_amd8111 sky2 tg3 amd_rng i2c_amd756 usbcore
[ 4204.233349] Pid: 0, comm: swapper Not tainted 2.6.18-rc3-htb #2
[ 4204.251061] RIP: 0010:[<ffffffff8100b095>] [<ffffffff8100b095>] show_trace+0x2ba/0x31f
[ 4204.275061] RSP: 0018:ffffffff8141db90 EFLAGS: 00010206
[ 4204.290956] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 000000000000f854
[ 4204.312304] RDX: ffffffff8141db80 RSI: 0000000000000000 RDI: 0000000000000001
[ 4204.333653] RBP: ffffffff8141dc80 R08: ffffffff8141db20 R09: 0000000000000001
[ 4204.355005] R10: ffffffff810496c0 R11: ffffffff810496c0 R12: ffffffff827ffffa
[ 4204.376354] R13: ffffffff8141dba0 R14: 0000000000000000 R15: 0000000000000000
[ 4204.397703] FS: 00002aee03c7d760(0000) GS:ffffffff816c5000(0000) knlGS:0000000000000000
[ 4204.421909] CS: 0010 DS: 0018 ES: 0018 CR0: 000000008005003b
[ 4204.439103] CR2: ffffffff82800000 CR3: 00000000704be000 CR4: 00000000000006e0
[ 4204.460452] Process swapper (pid: 0, threadinfo ffffffff816d4000, task ffffffff813508e0)
[ 4204.484656] Stack: 0000000000000086 0000000000000000 0000000000000000 0000000000000000
[ 4204.508862] 0000000000000000 0000000000000000 ffffffff8141df80 0000000000000046
[ 4204.531198] 0000000000000000 0000000000000000 0000000000000000 0000000000000000
[ 4204.552965] Call Trace:
[ 4204.560878] [<ffffffff8100b10f>] dump_stack+0x15/0x17
[ 4204.576253] [<ffffffff88130171>] :sch_htb:htb_safe_rb_erase+0x3b/0x55
[ 4204.595776] [<ffffffff881304d6>] :sch_htb:htb_deactivate_prios+0x174/0x1ce
[ 4204.616601] [<ffffffff8813149e>] :sch_htb:htb_dequeue+0x4ef/0x88a
[ 4204.635094] [<ffffffff811fac3d>] __qdisc_run+0x41/0x1e5
[ 4204.651527] [<ffffffff811eee34>] dev_queue_xmit+0x134/0x258
[ 4204.668961] [<ffffffff81229d00>] arp_xmit+0x4e/0x50
[ 4204.684352] [<ffffffff8122a6de>] arp_send+0x28/0x2a
[ 4204.699724] [<ffffffff8122afce>] arp_solicit+0x19a/0x1ab
[ 4204.716400] [<ffffffff811f4d3e>] neigh_timer_handler+0x31f/0x361
[ 4204.735116] [<ffffffff8103440e>] run_timer_softirq+0x147/0x1d0
[ 4204.752894] [<ffffffff81030bc0>] __do_softirq+0x67/0xf4
[ 4204.768832] [<ffffffff8100ab66>] call_softirq+0x1e/0x28
[ 4204.784728] DWARF2 unwinder stuck at call_softirq+0x1e/0x28
[ 4204.801389] Leftover inexact backtrace:
[ 4204.812870] <IRQ> [<ffffffff8100c0a6>] do_softirq+0x39/0x9f
[ 4204.829859] [<ffffffff81030b4d>] irq_exit+0x4e/0x5a
[ 4204.844716] [<ffffffff81014e38>] smp_apic_timer_interrupt+0x54/0x58
[ 4204.863725] [<ffffffff81008783>] default_idle+0x0/0x69
[ 4204.879362] [<ffffffff8100a4da>] apic_timer_interrupt+0x6a/0x70
[ 4204.897332] <EOI> [<ffffffff810037f1>] level3_kernel_pgt+0x7f1/0x1000
[ 4205.166202] [<ffffffff81007ed8>] do_arch_prctl+0x269/0x3a9
[ 4205.186515] [<ffffffff81004003>] level2_ident_pgt+0x3/0xa0
[ 4205.337294] [<ffffffff81004005>] level2_ident_pgt+0x5/0xa0
[ 4205.354250] [<ffffffff81004005>] level2_ident_pgt+0x5/0xa0
[ 4205.371061] [<ffffffff81004005>] level2_ident_pgt+0x5/0xa0
[ 4205.387865] [<ffffffff81004005>] level2_ident_pgt+0x5/0xa0
[ 4205.404670] [<ffffffff81004005>] level2_ident_pgt+0x5/0xa0
[ 4205.421462] [<ffffffff81004005>] level2_ident_pgt+0x5/0xa0
[ 4205.462728] [<ffffffff81006270>] level3_physmem_pgt+0x270/0x1000
[ 4205.480961] [<ffffffff81007bc6>] dump_task_regs+0x162/0x19c
[ 4205.508898] [<ffffffff810062ad>] level3_physmem_pgt+0x2ad/0x1000
[ 4205.540752] [<ffffffff810061a2>] level3_physmem_pgt+0x1a2/0x1000
[ 4205.559133] [<ffffffff81007ec9>] do_arch_prctl+0x25a/0x3a9
[ 4205.575865] [<ffffffff81007f16>] do_arch_prctl+0x2a7/0x3a9
[ 4205.594942] [<ffffffff81007ee1>] do_arch_prctl+0x272/0x3a9
[ 4206.060619] Unable to handle kernel paging request at ffffffff82800000 RIP:
[ 4206.074430] [<ffffffff8100b095>] show_trace+0x2ba/0x31f
[ 4206.097700] PGD 1003027 PUD 1005027 PMD 0
[ 4206.110115] Oops: 0000 [2] PREEMPT SMP
[ 4206.121751] CPU 0
[ 4206.127829] Modules linked in: cls_u32 sch_sfq sch_red sch_htb ipv6 autofs4 sunrpc binfmt_misc video thermal processor fan button battery asus_acpi ac tcp_cubic sg ehci_hcd ohci_hcd i2c_amd8111 sky2 tg3 amd_rng i2c_amd756 usbcore
[ 4206.190061] Pid: 0, comm: swapper Not tainted 2.6.18-rc3-htb #2
[ 4206.207773] RIP: 0010:[<ffffffff8100b095>] [<ffffffff8100b095>] show_trace+0x2ba/0x31f
[ 4206.231772] RSP: 0018:ffffffff8141d828 EFLAGS: 00010006
[ 4206.247666] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 000000000000f854
[ 4206.269016] RDX: ffffffff813508e0 RSI: 0000000000000000 RDI: 0000000000000001
[ 4206.290366] RBP: ffffffff8141d918 R08: ffffffff8141d7b8 R09: 0000000000000001
[ 4206.311715] R10: ffffffff810496c0 R11: ffffffff810496c0 R12: ffffffff827ffffa
[ 4206.333064] R13: ffffffff8141dae8 R14: 0000000000000000 R15: 0000000000000000
[ 4206.354414] FS: 00002aee03c7d760(0000) GS:ffffffff816c5000(0000) knlGS:0000000000000000
[ 4206.378620] CS: 0010 DS: 0018 ES: 0018 CR0: 000000008005003b
[ 4206.395813] CR2: ffffffff82800000 CR3: 00000000704be000 CR4: 00000000000006e0
[ 4206.417162] Process swapper (pid: 0, threadinfo ffffffff816d4000, task ffffffff813508e0)
[ 4206.441369] Stack: 0000000000000000 000000000000000c 0000000000000000 0000000000000000
[ 4206.465573] 0000000000000000 0000000000000000 ffffffff8141df80 0000000000000046
[ 4206.487911] ffffffff810496c0 ffffffff810496c0 0000000000000001 ffffffff8141db20
[ 4206.509675] Call Trace:
[ 4206.517586] [<ffffffff8100b1f3>] _show_stack+0xe2/0xf1
[ 4206.533218] [<ffffffff8100b28e>] show_registers+0x8c/0x100
[ 4206.549895] [<ffffffff81251ae3>] __die+0xa8/0xfc
[ 4206.563970] [<ffffffff812535aa>] do_page_fault+0x701/0x7fd
[ 4206.580681] [<ffffffff8100a63d>] error_exit+0x0/0x96
[ 4206.595807] DWARF2 unwinder stuck at error_exit+0x0/0x96
[ 4206.611695] Leftover inexact backtrace:
[ 4206.623176] <IRQ> [<ffffffff810496c0>] module_text_address+0x16/0x3b
[ 4206.642500] [<ffffffff810496c0>] module_text_address+0x16/0x3b
[ 4206.660215] [<ffffffff8100b095>] show_trace+0x2ba/0x31f
[ 4206.676115] [<ffffffff8100ab66>] call_softirq+0x1e/0x28
[ 4206.692008] [<ffffffff8100b10f>] dump_stack+0x15/0x17
[ 4206.707384] [<ffffffff88130171>] :sch_htb:htb_safe_rb_erase+0x3b/0x55
[ 4206.726914] [<ffffffff881304d6>] :sch_htb:htb_deactivate_prios+0x174/0x1ce
[ 4206.747744] [<ffffffff8813149e>] :sch_htb:htb_dequeue+0x4ef/0x88a
[ 4206.766238] [<ffffffff88130b3b>] :sch_htb:htb_activate_prios+0xe2/0xf3
[ 4206.786026] [<ffffffff811fac3d>] __qdisc_run+0x41/0x1e5
[ 4206.801920] [<ffffffff811eee34>] dev_queue_xmit+0x134/0x258
[ 4206.818854] [<ffffffff81229d00>] arp_xmit+0x4e/0x50
[ 4206.833709] [<ffffffff8122a6de>] arp_send+0x28/0x2a
[ 4206.848566] [<ffffffff8122afce>] arp_solicit+0x19a/0x1ab
[ 4206.864722] [<ffffffff811f4d3e>] neigh_timer_handler+0x31f/0x361
[ 4206.882954] [<ffffffff811f4a1f>] neigh_timer_handler+0x0/0x361
[ 4206.900668] [<ffffffff8103440e>] run_timer_softirq+0x147/0x1d0
[ 4206.918382] [<ffffffff81030bc0>] __do_softirq+0x67/0xf4
[ 4206.934277] [<ffffffff8100ab66>] call_softirq+0x1e/0x28
[ 4206.950171] [<ffffffff8100c0a6>] do_softirq+0x39/0x9f
[ 4206.965545] [<ffffffff81030b4d>] irq_exit+0x4e/0x5a
[ 4206.980402] [<ffffffff81014e38>] smp_apic_timer_interrupt+0x54/0x58
[ 4206.999412] [<ffffffff81008783>] default_idle+0x0/0x69
[ 4207.015049] [<ffffffff8100a4da>] apic_timer_interrupt+0x6a/0x70
[ 4207.033021] <EOI> [<ffffffff810037f1>] level3_kernel_pgt+0x7f1/0x1000
[ 4207.301701] [<ffffffff81007ed8>] do_arch_prctl+0x269/0x3a9
[ 4207.322013] [<ffffffff81004003>] level2_ident_pgt+0x3/0xa0
[ 4207.472520] [<ffffffff81004005>] level2_ident_pgt+0x5/0xa0
[ 4207.489494] [<ffffffff81004005>] level2_ident_pgt+0x5/0xa0
[ 4207.506308] [<ffffffff81004005>] level2_ident_pgt+0x5/0xa0
[ 4207.523112] [<ffffffff81004005>] level2_ident_pgt+0x5/0xa0
[ 4207.539917] [<ffffffff81004005>] level2_ident_pgt+0x5/0xa0
[ 4207.556709] [<ffffffff81004005>] level2_ident_pgt+0x5/0xa0
[ 4207.597924] [<ffffffff81006270>] level3_physmem_pgt+0x270/0x1000
[ 4207.616155] [<ffffffff81007bc6>] dump_task_regs+0x162/0x19c
[ 4207.644066] [<ffffffff810062ad>] level3_physmem_pgt+0x2ad/0x1000
[ 4207.675892] [<ffffffff810061a2>] level3_physmem_pgt+0x1a2/0x1000
[ 4207.694275] [<ffffffff81007ec9>] do_arch_prctl+0x25a/0x3a9
[ 4207.711007] [<ffffffff81007f16>] do_arch_prctl+0x2a7/0x3a9
[ 4207.730080] [<ffffffff81007ee1>] do_arch_prctl+0x272/0x3a9
[ 4208.194824] Unable to handle kernel paging request at ffffffff82800000 RIP:
[ 4208.208638] [<ffffffff8100b095>] show_trace+0x2ba/0x31f
[ 4208.231908] PGD 1003027 PUD 1005027 PMD 0
[ 4208.244323] Oops: 0000 [3] PREEMPT SMP
[ 4208.255959] CPU 0
[ 4208.262036] Modules linked in: cls_u32 sch_sfq sch_red sch_htb ipv6 autofs4 sunrpc binfmt_misc video thermal processor fan button battery asus_acpi ac tcp_cubic sg ehci_hcd ohci_hcd i2c_amd8111 sky2 tg3 amd_rng i2c_amd756 usbcore
[ 4208.324266] Pid: 0, comm: swapper Not tainted 2.6.18-rc3-htb #2
[ 4208.341980] RIP: 0010:[<ffffffff8100b095>] [<ffffffff8100b095>] show_trace+0x2ba/0x31f
[ 4208.365978] RSP: 0018:ffffffff8141d4b8 EFLAGS: 00010006
[ 4208.381872] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 000000000000f854
[ 4208.403222] RDX: ffffffff813508e0 RSI: 0000000000000000 RDI: 0000000000000001
[ 4208.424572] RBP: ffffffff8141d5a8 R08: ffffffff8141d448 R09: 0000000000000001
[ 4208.445921] R10: ffffffff810496c0 R11: ffffffff810496c0 R12: ffffffff827ffffa
[ 4208.467270] R13: ffffffff8141d778 R14: 0000000000000000 R15: 0000000000000000
[ 4208.488621] FS: 00002aee03c7d760(0000) GS:ffffffff816c5000(0000) knlGS:0000000000000000
[ 4208.512826] CS: 0010 DS: 0018 ES: 0018 CR0: 000000008005003b
[ 4208.530020] CR2: ffffffff82800000 CR3: 00000000704be000 CR4: 00000000000006e0
[ 4208.551370] Process swapper (pid: 0, threadinfo ffffffff816d4000, task ffffffff813508e0)
[ 4208.575574] Stack: 0000000000000000 000000000000000c 0000000000000000 0000000000000000
[ 4208.599781] ffffffff8141dba0 ffffffff827ffffa 0000000081009e4b 0000000000000001
[ 4208.622118] ffffffff810496c0 ffffffff810496c0 0000000000000001 ffffffff8141d7b8
[ 4208.643883] Call Trace:
[ 4208.651793] [<ffffffff8100b1f3>] _show_stack+0xe2/0xf1
[ 4208.667425] [<ffffffff8100b28e>] show_registers+0x8c/0x100
[ 4208.684103] [<ffffffff81251ae3>] __die+0xa8/0xfc
[ 4208.698177] [<ffffffff812535aa>] do_page_fault+0x701/0x7fd
[ 4208.714886] [<ffffffff8100a63d>] error_exit+0x0/0x96
[ 4208.730016] DWARF2 unwinder stuck at error_exit+0x0/0x96
[ 4208.745902] Leftover inexact backtrace:
[ 4208.757382] <IRQ> [<ffffffff810496c0>] module_text_address+0x16/0x3b
[ 4208.776707] [<ffffffff810496c0>] module_text_address+0x16/0x3b
[ 4208.794424] [<ffffffff8100b095>] show_trace+0x2ba/0x31f
[ 4208.810315] [<ffffffff8100b0a1>] show_trace+0x2c6/0x31f
[ 4208.826213] [<ffffffff810496c0>] module_text_address+0x16/0x3b
[ 4208.843924] [<ffffffff810496c0>] module_text_address+0x16/0x3b
[ 4208.861640] [<ffffffff8100ab66>] call_softirq+0x1e/0x28
[ 4208.877534] [<ffffffff8100b1f3>] _show_stack+0xe2/0xf1
[ 4208.893171] [<ffffffff8100b28e>] show_registers+0x8c/0x100
[ 4208.909843] [<ffffffff81251ae3>] __die+0xa8/0xfc
[ 4208.923921] [<ffffffff812535aa>] do_page_fault+0x701/0x7fd
[ 4208.940597] [<ffffffff81034e0d>] update_process_times+0x70/0x78
[ 4208.958566] [<ffffffff81250634>] trace_hardirqs_on_thunk+0x35/0x37
[ 4208.977318] [<ffffffff810496c0>] module_text_address+0x16/0x3b
[ 4208.995031] [<ffffffff810496c0>] module_text_address+0x16/0x3b
[ 4209.012748] [<ffffffff8100a63d>] error_exit+0x0/0x96
[ 4209.027861] [<ffffffff810496c0>] module_text_address+0x16/0x3b
[ 4209.045574] [<ffffffff810496c0>] module_text_address+0x16/0x3b
[ 4209.063290] [<ffffffff8100b095>] show_trace+0x2ba/0x31f
[ 4209.079187] [<ffffffff8100ab66>] call_softirq+0x1e/0x28
[ 4209.095081] [<ffffffff8100b10f>] dump_stack+0x15/0x17
[ 4209.110458] [<ffffffff88130171>] :sch_htb:htb_safe_rb_erase+0x3b/0x55
[ 4209.129987] [<ffffffff881304d6>] :sch_htb:htb_deactivate_prios+0x174/0x1ce
[ 4209.150818] [<ffffffff8813149e>] :sch_htb:htb_dequeue+0x4ef/0x88a
[ 4209.169312] [<ffffffff88130b3b>] :sch_htb:htb_activate_prios+0xe2/0xf3
[ 4209.189100] [<ffffffff811fac3d>] __qdisc_run+0x41/0x1e5
[ 4209.204996] [<ffffffff811eee34>] dev_queue_xmit+0x134/0x258
[ 4209.221929] [<ffffffff81229d00>] arp_xmit+0x4e/0x50
[ 4209.236782] [<ffffffff8122a6de>] arp_send+0x28/0x2a
[ 4209.251639] [<ffffffff8122afce>] arp_solicit+0x19a/0x1ab
[ 4209.267797] [<ffffffff811f4d3e>] neigh_timer_handler+0x31f/0x361
[ 4209.286027] [<ffffffff811f4a1f>] neigh_timer_handler+0x0/0x361
[ 4209.303741] [<ffffffff8103440e>] run_timer_softirq+0x147/0x1d0
[ 4209.321455] [<ffffffff81030bc0>] __do_softirq+0x67/0xf4
[ 4209.337349] [<ffffffff8100ab66>] call_softirq+0x1e/0x28
[ 4209.353243] [<ffffffff8100c0a6>] do_softirq+0x39/0x9f
[ 4209.368618] [<ffffffff81030b4d>] irq_exit+0x4e/0x5a
[ 4209.383476] [<ffffffff81014e38>] smp_apic_timer_interrupt+0x54/0x58
[ 4209.402488] [<ffffffff81008783>] default_idle+0x0/0x69
[ 4209.418122] [<ffffffff8100a4da>] apic_timer_interrupt+0x6a/0x70
[ 4209.436093] <EOI> [<ffffffff810037f1>] level3_kernel_pgt+0x7f1/0x1000
[ 4209.704133] [<ffffffff81007ed8>] do_arch_prctl+0x269/0x3a9
[ 4209.724444] [<ffffffff81004003>] level2_ident_pgt+0x3/0xa0
[ 4209.874945] [<ffffffff81004005>] level2_ident_pgt+0x5/0xa0
[ 4209.891918] [<ffffffff81004005>] level2_ident_pgt+0x5/0xa0
[ 4209.908732] [<ffffffff81004005>] level2_ident_pgt+0x5/0xa0
[ 4209.925535] [<ffffffff81004005>] level2_ident_pgt+0x5/0xa0
[ 4209.942339] [<ffffffff81004005>] level2_ident_pgt+0x5/0xa0
[ 4209.959133] [<ffffffff81004005>] level2_ident_pgt+0x5/0xa0
[ 4210.000346] [<ffffffff81006270>] level3_physmem_pgt+0x270/0x1000
[ 4210.018579] [<ffffffff81007bc6>] dump_task_regs+0x162/0x19c
[ 4210.046492] [<ffffffff810062ad>] level3_physmem_pgt+0x2ad/0x1000
[ 4210.078341] [<ffffffff810061a2>] level3_physmem_pgt+0x1a2/0x1000
[ 4210.096724] [<ffffffff81007ec9>] do_arch_prctl+0x25a/0x3a9
[ 4210.113458] [<ffffffff81007f16>] do_arch_prctl+0x2a7/0x3a9
[ 4210.132529] [<ffffffff81007ee1>] do_arch_prctl+0x272/0x3a9
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