29 Nov
2019
29 Nov
'19
5:57 p.m.
On Mon, Oct 21, 2019 at 01:33:27PM +0200, Christian Brauner wrote:
When assiging and testing taskstats in taskstats_exit() there's a race when writing and reading sig->stats when a thread-group with more than one thread exits:
cpu0: thread catches fatal signal and whole thread-group gets taken down do_exit() do_group_exit()
Nit: I don't think this is the signal-handling path.
taskstats_exit() taskstats_tgid_alloc() The tasks reads sig->stats without holding sighand lock.
cpu1: task calls exit_group() do_exit() do_group_exit()
Nit: These ^^ seem to be the wrong way round.
Will