| commit | af8f4062c24cb36af4dc24fbaffd23aa7f7bde36 | [log] [tgz] |
|---|---|---|
| author | Cherry Zhang <cherryyz@google.com> | Sat Feb 09 23:31:59 2019 -0500 |
| committer | Cherry Zhang <cherryyz@google.com> | Wed Feb 13 15:49:22 2019 +0000 |
| tree | 9b3c719fea5208f3acb4a402790f1c551247b09e | |
| parent | ffd096db2b1cff6399eb1f86e5652564ee8ee362 [diff] |
runtime: scan gp._panic in stack scan In runtime.gopanic, the _panic object p is stack allocated and referenced from gp._panic. With stack objects, p on stack is dead at the point preprintpanics runs. gp._panic points to p, but stack scan doesn't look at gp. Heap scan of gp does look at gp._panic, but it stops and ignores the pointer as it points to the stack. So whatever p points to may be collected and clobbered. We need to scan gp._panic explicitly during stack scan. To test it reliably, we introduce a GODEBUG mode "clobberfree", which clobbers the memory content when the GC frees an object. Fixes #30150. Change-Id: I11128298f03a89f817faa221421a9d332b41dced Reviewed-on: https://go-review.googlesource.com/c/161778 Run-TryBot: Cherry Zhang <cherryyz@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Keith Randall <khr@golang.org> Reviewed-by: Austin Clements <austin@google.com>
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