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SubjectRe: [PATCH v4 29/33] x86/mm: try VMA lock-based page fault handling first
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On 30. 06. 23, 10:28, Jiri Slaby wrote:
> > 2348
> clone3({flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID, child_tid=0x7fcaa5882990, parent_tid=0x7fcaa5882990, exit_signal=0, stack=0x7fcaa5082000, stack_size=0x7ffe00, tls=0x7fcaa58826c0} => {parent_tid=[2351]}, 88) = 2351
> > 2350  <... clone3 resumed> => {parent_tid=[2372]}, 88) = 2372
> > 2351  <... clone3 resumed> => {parent_tid=[2354]}, 88) = 2354
> > 2351  <... clone3 resumed> => {parent_tid=[2357]}, 88) = 2357
> > 2354  <... clone3 resumed> => {parent_tid=[2355]}, 88) = 2355
> > 2355  <... clone3 resumed> => {parent_tid=[2370]}, 88) = 2370
> > 2370  mmap(NULL, 262144, PROT_READ|PROT_WRITE,
> MAP_PRIVATE|MAP_ANONYMOUS, -1, 0 <unfinished ...>
> > 2370  <... mmap resumed>)               = 0x7fca68249000
> > 2372  <... clone3 resumed> => {parent_tid=[2384]}, 88) = 2384
> > 2384  <... clone3 resumed> => {parent_tid=[2388]}, 88) = 2388
> > 2388  <... clone3 resumed> => {parent_tid=[2392]}, 88) = 2392
> > 2392  <... clone3 resumed> => {parent_tid=[2395]}, 88) = 2395
> > 2395  write(2, "runtime: marked free object in s"..., 36 <unfinished
> ...>
>
> I.e. IIUC, all are threads (CLONE_VM) and thread 2370 mapped ANON
> 0x7fca68249000 - 0x7fca6827ffff and go in thread 2395 thinks for some
> reason 0x7fca6824bec8 in that region is "bad".

As I was noticed, this might be as well be a fail of the go's
inter-thread communication (or alike) too. It might now be only more
exposed with vma-based locks as we can do more parallelism now.

There are older hard to reproduce bugs in go with similar symptoms (we
see this error sometimes now too):
https://github.com/golang/go/issues/15246

Or this 2016 bug is a red herring. Hard to tell...

>> thanks,
--
js
suse labs

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