author | Shawn Walker-Salas <shawn.walker@oracle.com> |
Thu, 21 Jan 2016 09:20:59 -0800 | |
changeset 5331 | 9c955076ffe3 |
permissions | -rw-r--r-- |
5331
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1 |
From 23ef1e1933f4483572159277a99f2efc5003e1a2 Mon Sep 17 00:00:00 2001 |
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From: Austin Clements <[email protected]> |
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3 |
Date: Wed, 26 Aug 2015 12:16:51 -0400 |
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Subject: [PATCH 11/63] [release-branch.go1.5] runtime: don't install a stack |
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5 |
barrier in cgocallback_gofunc's frame |
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|
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Currently the runtime can install stack barriers in any frame. |
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8 |
However, the frame of cgocallback_gofunc is special: it's the one |
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function that switches from a regular G stack to the system stack on |
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return. Hence, the return PC slot in its frame on the G stack is |
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actually used to save getg().sched.pc (so tracebacks appear to unwind |
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to the last Go function running on that G), and not as an actual |
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return PC for cgocallback_gofunc. |
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|
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15 |
Because of this, if we install a stack barrier in cgocallback_gofunc's |
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return PC slot, when cgocallback_gofunc does return, it will move the |
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stack barrier stub PC in to getg().sched.pc and switch back to the |
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system stack. The rest of the runtime doesn't know how to deal with a |
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stack barrier stub in sched.pc: nothing knows how to match it up with |
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20 |
the G's stack barrier array and, when the runtime removes stack |
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barriers, it doesn't know to undo the one in sched.pc. Hence, if the C |
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code later returns back in to Go code, it will attempt to return |
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23 |
through the stack barrier saved in sched.pc, which may no longer have |
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correct unwinding information. |
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Fix this by blacklisting cgocallback_gofunc's frame so the runtime |
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won't install a stack barrier in it's return PC slot. |
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Fixes #12238. |
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Change-Id: I46aa2155df2fd050dd50de3434b62987dc4947b8 |
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Reviewed-on: https://go-review.googlesource.com/13944 |
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Reviewed-by: Russ Cox <[email protected]> |
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Reviewed-on: https://go-review.googlesource.com/14229 |
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Reviewed-by: Austin Clements <[email protected]> |
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--- |
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src/runtime/asm_amd64p32.s | 6 ++++++ |
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src/runtime/mgcmark.go | 25 ++++++++++++++++++++----- |
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src/runtime/traceback.go | 2 ++ |
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3 files changed, 28 insertions(+), 5 deletions(-) |
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|
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diff --git a/src/runtime/asm_amd64p32.s b/src/runtime/asm_amd64p32.s |
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index a5d6e81..6e97256 100644 |
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--- a/src/runtime/asm_amd64p32.s |
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+++ b/src/runtime/asm_amd64p32.s |
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@@ -599,6 +599,12 @@ TEXT runtime·cgocallback(SB),NOSPLIT,$0-12 |
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MOVL 0, AX |
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RET |
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|
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+// cgocallback_gofunc(FuncVal*, void *frame, uintptr framesize) |
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+// Not implemented. |
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+TEXT ·cgocallback_gofunc(SB),NOSPLIT,$0-12 |
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+ MOVL 0, AX |
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+ RET |
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+ |
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// void setg(G*); set g. for use by needm. |
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// Not implemented. |
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TEXT runtime·setg(SB), NOSPLIT, $0-4 |
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diff --git a/src/runtime/mgcmark.go b/src/runtime/mgcmark.go |
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index 2e43830..44f9512 100644 |
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--- a/src/runtime/mgcmark.go |
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+++ b/src/runtime/mgcmark.go |
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@@ -388,9 +388,10 @@ func scanstack(gp *g) { |
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// frame because on LR machines this LR is not |
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// on the stack. |
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if gcphase == _GCscan && n != 0 { |
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- gcInstallStackBarrier(gp, frame) |
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- barrierOffset *= 2 |
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- nextBarrier = sp + barrierOffset |
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+ if gcInstallStackBarrier(gp, frame) { |
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+ barrierOffset *= 2 |
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+ nextBarrier = sp + barrierOffset |
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+ } |
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} else if gcphase == _GCmarktermination { |
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// We just scanned a frame containing |
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// a return to a stack barrier. Since |
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@@ -509,12 +510,25 @@ func gcMaxStackBarriers(stackSize int) (n int) { |
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|
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// gcInstallStackBarrier installs a stack barrier over the return PC of frame. |
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//go:nowritebarrier |
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-func gcInstallStackBarrier(gp *g, frame *stkframe) { |
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+func gcInstallStackBarrier(gp *g, frame *stkframe) bool { |
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if frame.lr == 0 { |
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if debugStackBarrier { |
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print("not installing stack barrier with no LR, goid=", gp.goid, "\n") |
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} |
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- return |
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+ return false |
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+ } |
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+ |
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+ if frame.fn.entry == cgocallback_gofuncPC { |
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+ // cgocallback_gofunc doesn't return to its LR; |
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+ // instead, its return path puts LR in g.sched.pc and |
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+ // switches back to the system stack on which |
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+ // cgocallback_gofunc was originally called. We can't |
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+ // have a stack barrier in g.sched.pc, so don't |
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+ // install one in this frame. |
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+ if debugStackBarrier { |
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+ print("not installing stack barrier over LR of cgocallback_gofunc, goid=", gp.goid, "\n") |
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+ } |
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+ return false |
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102 |
} |
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|
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// Save the return PC and overwrite it with stackBarrier. |
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@@ -538,6 +552,7 @@ func gcInstallStackBarrier(gp *g, frame *stkframe) { |
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stkbar.savedLRPtr = lrUintptr |
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stkbar.savedLRVal = uintptr(*lrPtr) |
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*lrPtr = uintreg(stackBarrierPC) |
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109 |
+ return true |
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} |
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// gcRemoveStackBarriers removes all stack barriers installed in gp's stack. |
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diff --git a/src/runtime/traceback.go b/src/runtime/traceback.go |
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index 48ef6e5..2def359 100644 |
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--- a/src/runtime/traceback.go |
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+++ b/src/runtime/traceback.go |
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@@ -48,6 +48,7 @@ var ( |
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systemstack_switchPC uintptr |
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systemstackPC uintptr |
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stackBarrierPC uintptr |
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+ cgocallback_gofuncPC uintptr |
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gogoPC uintptr |
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@@ -75,6 +76,7 @@ func tracebackinit() { |
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systemstack_switchPC = funcPC(systemstack_switch) |
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systemstackPC = funcPC(systemstack) |
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stackBarrierPC = funcPC(stackBarrier) |
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+ cgocallback_gofuncPC = funcPC(cgocallback_gofunc) |
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// used by sigprof handler |
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gogoPC = funcPC(gogo) |
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-- |
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2.6.1 |
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