[CRIU] Does CRIU handle Futex system calls ?

[Adrian Reber]

Please try to submit your question as a github issue. Much higher
chances of getting an answer there.

		Adrian

On Thu, Jul 07, 2022 at 01:39:17PM +0200, Dorian Goepp wrote:
> Hi, 
> 
> Is this the right place to ask questions about CRIU's features and
> internals? 
> 
> If so, I have been considering CRIU for dumping and restoring a process
> with a set of threads synchronised through futexes [1]. It seems to
> work, but, I cannot tell from the documentation (wiki) whether it is
> officially supported, or just accidentally works for the cases I tested
> it with. 
> 
> I could not find which parts would take care of the state of the
> futex_wait system call in CRIU's source code, except maybe for
> `get_task_regs()` in crui/compel/arch/x86/src/lib/infect.c (I run it on
> an amd64 processor). This function issues the warning "Will restore %d
> with interrupted system call" when I dump the futex-heavy process. Is it
> enough to save the process's register state to resume the futex system
> call correctly ? 
> 
> Best regards, 
> 
> Dorian Goepp 
> 
> Links:
> ------
> [1] https://man7.org/linux/man-pages/man2/futex.2.html

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