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authorOleg Nesterov <oleg@redhat.com>2016-01-20 23:59:55 +0100
committerLinus Torvalds <torvalds@linux-foundation.org>2016-01-21 02:09:18 +0100
commit7c3b00e06d731a28fc3d17ed02ba250642b15b81 (patch)
treea6367f3ebe8e98bd217336af1f70115ffef5a8b7 /kernel/exit.c
parentfat: constify fatent_operations structures (diff)
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ptrace: make wait_on_bit(JOBCTL_TRAPPING_BIT) in ptrace_attach() killable
ptrace_attach() can hang waiting for STOPPED -> TRACED transition if the tracee gets frozen in between, change wait_on_bit() to use TASK_KILLABLE. This doesn't really solve the problem(s) and we probably need to fix the freezer. In particular, note that this means that pm freezer will fail if it races attach-to-stopped-task. And otoh perhaps we can just remove JOBCTL_TRAPPING_BIT altogether, it is not clear if we really need to hide this transition from debugger, WNOHANG after PTRACE_ATTACH can fail anyway if it races with SIGCONT. Signed-off-by: Oleg Nesterov <oleg@redhat.com> Reported-by: Andrey Ryabinin <aryabinin@virtuozzo.com> Cc: Roland McGrath <roland@hack.frob.com> Acked-by: Tejun Heo <tj@kernel.org> Cc: Pedro Alves <palves@redhat.com> Cc: Jan Kratochvil <jan.kratochvil@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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