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| author |   Oleg Nesterov <oleg@redhat.com> | 2016-01-20 14:59:55 -0800 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2016-01-20 17:09:18 -0800 |
| commit | 7c3b00e06d731a28fc3d17ed02ba250642b15b81 (patch) | |
| tree | a6367f3ebe8e98bd217336af1f70115ffef5a8b7 /fs/proc/namespaces.c | |
| parent | fat: constify fatent_operations structures (diff) | |
| download | linux-dev-7c3b00e06d731a28fc3d17ed02ba250642b15b81.tar.xz linux-dev-7c3b00e06d731a28fc3d17ed02ba250642b15b81.zip | |
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>
Diffstat (limited to 'fs/proc/namespaces.c')
0 files changed, 0 insertions, 0 deletions