[x86/dumpstack] cf0082cde6: BUG: unable to handle kernel NULL pointer dereference at 0000000000000010
7:07 p.m.
Greetings,
0day kernel testing robot got the below dmesg and the first bad commit is
https://git.kernel.org/pub/scm/linux/kernel/git/luto/linux.git x86/vmap_stack
commit cf0082cde65d1941a996d026f2b2cdbfaca17bfa
Author: Andy Lutomirski <luto(a)kernel.org>
AuthorDate: Wed Jun 29 16:08:57 2016 -0700
Commit: Andy Lutomirski <luto(a)kernel.org>
CommitDate: Thu Sep 15 11:44:54 2016 -0700
x86/dumpstack: Pin the target stack when dumping it
Specifically, pin the stack in save_stack_trace_tsk() and
show_trace_log_lvl().
This will prevent a crash if the target task dies before or while
dumping its stack once we start freeing task stacks early.
Cc: Josh Poimboeuf <jpoimboe(a)redhat.com>
Signed-off-by: Andy Lutomirski <luto(a)kernel.org>
+-------------------------------------------------+------------+------------+------------+
| | cb9b16bbc1 | cf0082cde6 | 158edabbb2
|
+-------------------------------------------------+------------+------------+------------+
| boot_successes | 95 | 0 | 0
|
| boot_failures | 5 | 34 | 78
|
| calltrace:SyS_open | 5 | |
|
| BUG:kernel_reboot-without-warning_in_test_stage | 5 | |
|
| BUG:unable_to_handle_kernel | 0 | 34 | 78
|
| Oops | 0 | 34 | 78
|
| RIP:show_stack_log_lvl | 0 | 34 | 78
|
| RIP:show_regs | 0 | 34 | 78
|
| BUG:stack_guard_page_was_hit_at#(stack_is#..#) | 0 | 34 | 77
|
| RIP:vsnprintf | 0 | 33 | 77
|
+-------------------------------------------------+------------+------------+------------+
[ 26.926613] #2: MTPAV on parallel port at 0x378
[ 26.936206] genirq: Flags mismatch irq 4. 00000000 (serial) vs. 00000080
(goldfish_pdev_bus)
[ 26.947288] CPU: 0 PID: 1 Comm: swapper Not tainted 4.8.0-rc6-00273-gcf0082c #1
[ 26.956952] BUG: unable to handle kernel NULL pointer dereference at 0000000000000010
[ 26.967546] IP: [<ffffffff810181f0>] show_stack_log_lvl+0x0/0x20
[ 26.976033] PGD 0
[ 26.979012] Oops: 0000 [#1] PREEMPT
[ 26.997939] CPU: 0 PID: 1 Comm: swapper Not tainted 4.8.0-rc6-00273-gcf0082c #1
[ 27.017936] task: ffff88001e460040 task.stack: ffffc90000008000
[ 27.035855] RIP: 0010:[<ffffffff810181f0>] [<ffffffff810181f0>]
show_stack_log_lvl+0x0/0x20
[ 27.047423] RSP: 0000:ffffc9000000ba60 EFLAGS: 00010046
[ 27.054391] RAX: 0000000000000043 RBX: ffff880019f89100 RCX: ffffc9000000ba68
[ 27.064205] RDX: ffffc9000000ba68 RSI: 0000000000000000 RDI: 0000000000000000
[ 27.073899] RBP: ffffc9000000ba68 R08: ffffffff81f0a68c R09: 0000000000000000
[ 27.083462] R10: 0000000000000292 R11: 0000000000000001 R12: ffff88001998de80
[ 27.092960] R13: ffff88001e405a00 R14: 00000000fffffff0 R15: ffff88001e405aa0
[ 27.102516] FS: 0000000000000000(0000) GS:ffffffff8222e000(0000)
knlGS:0000000000000000
[ 27.113342] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 27.121121] CR2: 0000000000000010 CR3: 000000000220c000 CR4: 00000000000006f0
[ 27.131386] Stack:
[ 27.137518] BUG: unable to handle kernel NULL pointer dereference at 0000000000000010
[ 27.153941] IP: [<ffffffff8101827c>] show_regs+0x6c/0x180
[ 27.161491] PGD 0
[ 27.164511] Oops: 0000 [#2] PREEMPT
[ 27.169434] CPU: 0 PID: 1 Comm: swapper Not tainted 4.8.0-rc6-00273-gcf0082c #1
[ 27.179186] task: ffff88001e460040 task.stack: ffffc90000008000
[ 27.187221] RIP: 0010:[<ffffffff8101827c>] [<ffffffff8101827c>]
show_regs+0x6c/0x180
[ 27.198111] RSP: 0000:ffffc9000000b7e8 EFLAGS: 00010016
[ 27.205277] RAX: 0000000000000006 RBX: ffffc9000000b9b8 RCX: 0000000000000000
[ 27.214995] RDX: ffffffff810c57a9 RSI: 0000000000000001 RDI: 0000000000000096
[ 27.224462] RBP: ffffc9000000b818 R08: 0000000000000001 R09: 0000000000000000
[ 27.234117] R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000
[ 27.243841] R13: 000000000000002b R14: 0000000000000000 R15: 0000000000000040
[ 27.253425] FS: 0000000000000000(0000) GS:ffffffff8222e000(0000)
knlGS:0000000000000000
[ 27.264248] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 27.271971] CR2: 0000000000000010 CR3: 000000000220c000 CR4: 00000000000006f0
[ 27.281817] Stack:
[ 27.284700] BUG: unable to handle kernel NULL pointer dereference at 0000000000000010
[ 27.295594] IP: [<ffffffff8101827c>] show_regs+0x6c/0x180
[ 27.303205] PGD 0
[ 27.306254] Oops: 0000 [#3] PREEMPT
[ 27.311173] CPU: 0 PID: 1 Comm: swapper Not tainted 4.8.0-rc6-00273-gcf0082c #1
[ 27.322197] task: ffff88001e460040 task.stack: ffffc90000008000
[ 27.332404] RIP: 0010:[<ffffffff8101827c>] [<ffffffff8101827c>]
show_regs+0x6c/0x180
[ 27.352886] RSP: 0000:ffffc9000000b568 EFLAGS: 00010016
[ 27.360105] RAX: 0000000000000006 RBX: ffffc9000000b738 RCX: 0000000000000000
[ 27.389211] RDX: ffffffff810c57a9 RSI: 0000000000000001 RDI: 0000000000000092
[ 27.400291] RBP: ffffc9000000b598 R08: 0000000000000001 R09: 0000000000000000
[ 27.422618] R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000
[ 27.432337] R13: 000000000000002b R14: 0000000000000000 R15: 0000000000000040
[ 27.462025] FS: 0000000000000000(0000) GS:ffffffff8222e000(0000)
knlGS:0000000000000000
[ 27.476128] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 27.484678] CR2: 0000000000000010 CR3: 000000000220c000 CR4: 00000000000006f0
[ 27.494363] Stack:
[ 27.497344] BUG: unable to handle kernel NULL pointer dereference at 0000000000000010
[ 27.508914] IP: [<ffffffff8101827c>] show_regs+0x6c/0x180
[ 27.516468] PGD 0
[ 27.519942] Oops: 0000 [#4] PREEMPT
[ 27.525377] CPU: 0 PID: 1 Comm: swapper Not tainted 4.8.0-rc6-00273-gcf0082c #1
[ 27.536076] task: ffff88001e460040 task.stack: ffffc90000008000
[ 27.544082] RIP: 0010:[<ffffffff8101827c>] [<ffffffff8101827c>]
show_regs+0x6c/0x180
[ 27.556103] RSP: 0000:ffffc9000000b2e8 EFLAGS: 00010016
[ 27.563293] RAX: 0000000000000006 RBX: ffffc9000000b4b8 RCX: 0000000000000000
[ 27.573920] RDX: ffffffff810c57a9 RSI: 0000000000000001 RDI: 0000000000000096
[ 27.583903] RBP: ffffc9000000b318 R08: 0000000000000001 R09: 0000000000000000
[ 27.594761] R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000
[ 27.616956] R13: 000000000000002b R14: 0000000000000000 R15: 0000000000000040
[ 27.641195] FS: 0000000000000000(0000) GS:ffffffff8222e000(0000)
knlGS:0000000000000000
[ 27.663593] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 27.682740] CR2: 0000000000000010 CR3: 000000000220c000 CR4: 00000000000006f0
[ 27.702871] Stack:
[ 27.712270] BUG: unable to handle kernel NULL pointer dereference at 0000000000000010
[ 27.732782] IP: [<ffffffff8101827c>] show_regs+0x6c/0x180
[ 27.750086] PGD 0
[ 27.752999] Oops: 0000 [#5] PREEMPT
[ 27.767682] CPU: 0 PID: 1 Comm: swapper Not tainted 4.8.0-rc6-00273-gcf0082c #1
[ 27.787162] task: ffff88001e460040 task.stack: ffffc90000008000
[ 27.795061] RIP: 0010:[<ffffffff8101827c>] [<ffffffff8101827c>]
show_regs+0x6c/0x180
[ 27.806436] RSP: 0000:ffffc9000000b068 EFLAGS: 00010016
[ 27.814502] RAX: 0000000000000006 RBX: ffffc9000000b238 RCX: 0000000000000000
[ 27.824105] RDX: ffffffff810c57a9 RSI: 0000000000000001 RDI: 0000000000000092
[ 27.834400] RBP: ffffc9000000b098 R08: 0000000000000001 R09: 0000000000000000
[ 27.844088] R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000
[ 27.854825] R13: 000000000000002b R14: 0000000000000000 R15: 0000000000000040
[ 27.864412] FS: 0000000000000000(0000) GS:ffffffff8222e000(0000)
knlGS:0000000000000000
[ 27.876245] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 27.884151] CR2: 0000000000000010 CR3: 000000000220c000 CR4: 00000000000006f0
[ 27.894296] Stack:
[ 27.897467] BUG: unable to handle kernel NULL pointer dereference at 0000000000000010
[ 27.908354] IP: [<ffffffff8101827c>] show_regs+0x6c/0x180
[ 27.916326] PGD 0
[ 27.919435] Oops: 0000 [#6] PREEMPT
[ 27.925698] CPU: 0 PID: 1 Comm: swapper Not tainted 4.8.0-rc6-00273-gcf0082c #1
[ 27.935547] task: ffff88001e460040 task.stack: ffffc90000008000
[ 27.949678] RIP: 0010:[<ffffffff8101827c>] [<ffffffff8101827c>]
show_regs+0x6c/0x180
[ 27.970482] RSP: 0000:ffffc9000000ade8 EFLAGS: 00010016
[ 27.987104] RAX: 0000000000000006 RBX: ffffc9000000afb8 RCX: 0000000000000000
[ 28.002527] RDX: ffffffff810c57a9 RSI: 0000000000000001 RDI: 0000000000000096
[ 28.024363] RBP: ffffc9000000ae18 R08: 0000000000000001 R09: 0000000000000000
[ 28.045012] R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000
[ 28.063680] R13: 000000000000002b R14: 0000000000000000 R15: 0000000000000040
[ 28.091514] FS: 0000000000000000(0000) GS:ffffffff8222e000(0000)
knlGS:0000000000000000
[ 28.113196] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 28.131497] CR2: 0000000000000010 CR3: 000000000220c000 CR4: 00000000000006f0
[ 28.151988] Stack:
[ 28.155001] BUG: unable to handle kernel NULL pointer dereference at 0000000000000010
[ 28.176812] IP: [<ffffffff8101827c>] show_regs+0x6c/0x180
[ 28.184621] PGD 0
[ 28.187598] Oops: 0000 [#7] PREEMPT
[ 28.192877] CPU: 0 PID: 1 Comm: swapper Not tainted 4.8.0-rc6-00273-gcf0082c #1
[ 28.202960] task: ffff88001e460040 task.stack: ffffc90000008000
[ 28.211062] RIP: 0010:[<ffffffff8101827c>] [<ffffffff8101827c>]
show_regs+0x6c/0x180
[ 28.222142] RSP: 0000:ffffc9000000ab68 EFLAGS: 00010016
[ 28.229243] RAX: 0000000000000006 RBX: ffffc9000000ad38 RCX: 0000000000000000
[ 28.239411] RDX: ffffffff810c57a9 RSI: 0000000000000001 RDI: 0000000000000092
[ 28.249107] RBP: ffffc9000000ab98 R08: 0000000000000001 R09: 0000000000000000
[ 28.258465] R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000
[ 28.268617] R13: 000000000000002b R14: 0000000000000000 R15: 0000000000000040
[ 28.278044] FS: 0000000000000000(0000) GS:ffffffff8222e000(0000)
knlGS:0000000000000000
[ 28.289549] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 28.297136] CR2: 0000000000000010 CR3: 000000000220c000 CR4: 00000000000006f0
[ 28.307407] Stack:
[ 28.310453] BUG: unable to handle kernel NULL pointer dereference at 0000000000000010
[ 28.321112] IP: [<ffffffff8101827c>] show_regs+0x6c/0x180
[ 28.328338] PGD 0
[ 28.331352] Oops: 0000 [#8] PREEMPT
[ 28.336024] CPU: 0 PID: 1 Comm: swapper Not tainted 4.8.0-rc6-00273-gcf0082c #1
[ 28.345605] task: ffff88001e460040 task.stack: ffffc90000008000
[ 28.353450] RIP: 0010:[<ffffffff8101827c>] [<ffffffff8101827c>]
show_regs+0x6c/0x180
[ 28.363923] RSP: 0000:ffffc9000000a8e8 EFLAGS: 00010016
[ 28.370981] RAX: 0000000000000006 RBX: ffffc9000000aab8 RCX: 0000000000000000
[ 28.380283] RDX: ffffffff810c57a9 RSI: 0000000000000001 RDI: 0000000000000096
[ 28.389716] RBP: ffffc9000000a918 R08: 0000000000000001 R09: 0000000000000000
[ 28.399052] R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000
[ 28.408380] R13: 000000000000002b R14: 0000000000000000 R15: 0000000000000040
[ 28.426274] FS: 0000000000000000(0000) GS:ffffffff8222e000(0000)
knlGS:0000000000000000
[ 28.436996] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 28.444547] CR2: 0000000000000010 CR3: 000000000220c000 CR4: 00000000000006f0
[ 28.453915] Stack:
[ 28.456698] BUG: unable to handle kernel NULL pointer dereference at 0000000000000010
[ 28.467299] IP: [<ffffffff8101827c>] show_regs+0x6c/0x180
[ 28.474623] PGD 0
[ 28.477570] Oops: 0000 [#9] PREEMPT
[ 28.482237] CPU: 0 PID: 1 Comm: swapper Not tainted 4.8.0-rc6-00273-gcf0082c #1
[ 28.491824] task: ffff88001e460040 task.stack: ffffc90000008000
[ 28.499576] RIP: 0010:[<ffffffff8101827c>] [<ffffffff8101827c>]
show_regs+0x6c/0x180
[ 28.510173] RSP: 0000:ffffc9000000a668 EFLAGS: 00010016
[ 28.518727] RAX: 0000000000000006 RBX: ffffc9000000a838 RCX: 0000000000000000
[ 28.530260] RDX: ffffffff810c57a9 RSI: 0000000000000001 RDI: 0000000000000092
[ 28.539620] RBP: ffffc9000000a698 R08: 0000000000000001 R09: 0000000000000000
[ 28.556157] R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000
[ 28.565479] R13: 000000000000002b R14: 0000000000000000 R15: 0000000000000040
[ 28.574853] FS: 0000000000000000(0000) GS:ffffffff8222e000(0000)
knlGS:0000000000000000
[ 28.591574] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 28.599187] CR2: 0000000000000010 CR3: 000000000220c000 CR4: 00000000000006f0
[ 28.608904] Stack:
[ 28.611669] BUG: unable to handle kernel NULL pointer dereference at 0000000000000010
[ 28.622323] IP: [<ffffffff8101827c>] show_regs+0x6c/0x180
[ 28.629775] PGD 0
[ 28.633079] Oops: 0000 [#10] PREEMPT
[ 28.638329] CPU: 0 PID: 1 Comm: swapper Not tainted 4.8.0-rc6-00273-gcf0082c #1
[ 28.648383] task: ffff88001e460040 task.stack: ffffc90000008000
[ 28.655992] RIP: 0010:[<ffffffff8101827c>] [<ffffffff8101827c>]
show_regs+0x6c/0x180
[ 28.666432] RSP: 0000:ffffc9000000a3e8 EFLAGS: 00010016
[ 28.673529] RAX: 0000000000000006 RBX: ffffc9000000a5b8 RCX: 0000000000000000
[ 28.683022] RDX: ffffffff810c57a9 RSI: 0000000000000001 RDI: 0000000000000096
[ 28.703503] RBP: ffffc9000000a418 R08: 0000000000000001 R09: 0000000000000000
[ 28.720485] R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000
[ 28.730469] R13: 000000000000002b R14: 0000000000000000 R15: 0000000000000040
[ 28.739930] FS: 0000000000000000(0000) GS:ffffffff8222e000(0000)
knlGS:0000000000000000
[ 28.750458] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 28.758040] CR2: 0000000000000010 CR3: 000000000220c000 CR4: 00000000000006f0
[ 28.767566] Stack:
[ 28.770360] BUG: unable to handle kernel NULL pointer dereference at 0000000000000010
[ 28.780985] IP: [<ffffffff8101827c>] show_regs+0x6c/0x180
[ 28.788371] PGD 0
[ 28.791319] Oops: 0000 [#11] PREEMPT
[ 28.801595] CPU: 0 PID: 1 Comm: swapper Not tainted 4.8.0-rc6-00273-gcf0082c #1
[ 28.811216] task: ffff88001e460040 task.stack: ffffc90000008000
[ 28.829201] RIP: 0010:[<ffffffff8101827c>] [<ffffffff8101827c>]
show_regs+0x6c/0x180
[ 28.849883] RSP: 0000:ffffc9000000a168 EFLAGS: 00010016
[ 28.857209] RAX: 0000000000000006 RBX: ffffc9000000a338 RCX: 0000000000000000
[ 28.866570] RDX: ffffffff810c57a9 RSI: 0000000000000001 RDI: 0000000000000092
[ 28.875938] RBP: ffffc9000000a198 R08: 0000000000000001 R09: 0000000000000000
[ 28.885591] R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000
[ 28.894957] R13: 000000000000002b R14: 0000000000000000 R15: 0000000000000040
[ 28.904293] FS: 0000000000000000(0000) GS:ffffffff8222e000(0000)
knlGS:0000000000000000
[ 28.915243] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 28.923571] CR2: 0000000000000010 CR3: 000000000220c000 CR4: 00000000000006f0
[ 28.933551] Stack:
[ 28.936468] BUG: unable to handle kernel NULL pointer dereference at 0000000000000010
[ 28.947417] IP: [<ffffffff8101827c>] show_regs+0x6c/0x180
[ 28.954747] PGD 0
[ 28.957694] Oops: 0000 [#12] PREEMPT
[ 28.962551] CPU: 0 PID: 1 Comm: swapper Not tainted 4.8.0-rc6-00273-gcf0082c #1
[ 28.980707] task: ffff88001e460040 task.stack: ffffc90000008000
[ 28.988551] RIP: 0010:[<ffffffff8101827c>] [<ffffffff8101827c>]
show_regs+0x6c/0x180
[ 29.003544] RSP: 0000:ffffc90000009ee8 EFLAGS: 00010016
[ 29.010613] RAX: 0000000000000006 RBX: ffffc9000000a0b8 RCX: 0000000000000000
[ 29.019950] RDX: ffffffff810c57a9 RSI: 0000000000000001 RDI: 0000000000000096
[ 29.029274] RBP: ffffc90000009f18 R08: 0000000000000001 R09: 0000000000000000
git bisect start 158edabbb20e066ec7381f62fcd2901eaeb505a3
9395452b4aab7bc2475ef8935b4a4fb99d778d70 --
git bisect bad c165bc2d5f248444036050ba70612d5aadc8b1c2 # 05:37 0- 22 Merge
'linux-review/Stefan-Assmann/i40e-clean-up-and-fix-for-the-i40e-debug-code/20160915-221245'
into devel-spot-201609160346
git bisect bad d6749849a291ef90e04105940306b1b5b3554479 # 05:58 0- 14 Merge
'linux-review/Alexander-Shishkin/perf-x86-intel-pt-Address-filtering-fixes-for-perf-urgent/20160916-012943'
into devel-spot-201609160346
git bisect bad 9c51380d8bb19770648a051bff6a910b84c4ca22 # 06:46 0- 16 Merge
'linux-review/Chuck-Lever/xprtrdma-Eliminate-INLINE_THRESHOLD-macros/20160916-021817'
into devel-spot-201609160346
git bisect good 89f0df8f3bd37debe4834f2951199781efbeb9e1 # 07:18 22+ 1 Merge
'linux-review/Eric-Dumazet/net-avoid-sk_forward_alloc-overflows/20160916-030759'
into devel-spot-201609160346
git bisect good 5f1df84fcf36fef0bb5ff29b012879296a6349c1 # 07:29 22+ 0 Merge
'tip/irq/core' into devel-spot-201609160346
git bisect good c0bc0c39cf85e22d5a579bdf15182944f43aeed3 # 07:44 22+ 0 Merge
'linux-review/Aidan-Thornton/ch341-cleanup-and-parity-etc-support/20160916-024549'
into devel-spot-201609160346
git bisect bad 9554be085d53a9d0d7ba4ba4e584227485524265 # 07:56 0- 7 Merge
'luto/x86/vmap_stack' into devel-spot-201609160346
git bisect good 2b3061c77ce7e429b25a25560ba088e8e7193a67 # 09:11 22+ 0 Merge
branch 'x86/mm' into x86/asm, to unify the two branches for simplicity
git bisect good fcd709ef20a9d83bdb7524d27cd6719dac8690a0 # 09:37 22+ 0
x86/dumpstack: Add recursion checking for all stacks
git bisect good c65eacbe290b8141554c71b2c94489e73ade8c8d # 11:00 22+ 1
sched/core: Allow putting thread_info into task_struct
git bisect good 17a434f50ad3d77000104f21666575e10a9c1fbd # 11:29 22+ 0 sched:
Add try_get_task_stack() and put_task_stack()
git bisect bad cf0082cde65d1941a996d026f2b2cdbfaca17bfa # 11:43 0- 4
x86/dumpstack: Pin the target stack when dumping it
git bisect good cb9b16bbc19d4aea4507ab0552e4644c1211d130 # 12:07 21+ 1 kthread:
to_live_kthread() needs try_get_task_stack()
# first bad commit: [cf0082cde65d1941a996d026f2b2cdbfaca17bfa] x86/dumpstack: Pin the
target stack when dumping it
git bisect good cb9b16bbc19d4aea4507ab0552e4644c1211d130 # 12:11 67+ 3 kthread:
to_live_kthread() needs try_get_task_stack()
# extra tests on HEAD of linux-devel/devel-spot-201609160346
git bisect bad 158edabbb20e066ec7381f62fcd2901eaeb505a3 # 12:11 0- 78 0day
head guard for 'devel-spot-201609160346'
# extra tests on tree/branch luto/x86/vmap_stack
git bisect bad d93c9c345dd8cff8a426a455cd94d9468d8a4e76 # 15:25 0- 15
scatterlist: Support virtually-mapped stacks in sg_init_stackbuf()
# extra tests with first bad commit reverted
git bisect bad de9e09a6a17fcd4956224f6e0b500d60dcbac2d0 # 02:32 10- 1 Revert
"x86/dumpstack: Pin the target stack when dumping it"
# extra tests on tree/branch linus/master
git bisect good 024c7e3756d8a42fc41fe8a9488488b9b09d1dcc # 02:59 122+ 2 Merge
tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm
# extra tests on tree/branch linux-next/master
git bisect good ddf9d15aed5ba5786cf4b082576c44ce37cd29c2 # 03:06 121+ 66 Add
linux-next specific files for 20160916
---
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