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| author | Oleg Nesterov <oleg@redhat.com> | 2011-09-26 19:06:32 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2011-11-11 09:36:23 -0800 |
| commit | 43742b14ffbe87453e96f4411389445fc707df57 (patch) | |
| tree | 42e98afb73a408e2cf9b3525648657f8c7612d2c /drivers/tty/serial | |
| parent | eb4b2df8f20d4479eceeb9bc51695caaa7bcd229 (diff) | |
| download | kernel_samsung_espresso10-43742b14ffbe87453e96f4411389445fc707df57.zip kernel_samsung_espresso10-43742b14ffbe87453e96f4411389445fc707df57.tar.gz kernel_samsung_espresso10-43742b14ffbe87453e96f4411389445fc707df57.tar.bz2 | |
ptrace: don't clear GROUP_STOP_SIGMASK on double-stop
[This does not correspond to any specific patch in the upstream tree as it was
fixed accidentally by rewriting the code in the 3.1 release]
https://bugzilla.redhat.com/show_bug.cgi?id=740121
1. Luke Macken triggered WARN_ON(!(group_stop & GROUP_STOP_SIGMASK))
in do_signal_stop().
This is because do_signal_stop() clears GROUP_STOP_SIGMASK part
unconditionally but doesn't update it if task_is_stopped().
2. Looking at this problem I noticed that WARN_ON_ONCE(!ptrace) is
not right, a stopped-but-resumed tracee can clone the untraced
thread in the SIGNAL_STOP_STOPPED group, the new thread can start
another group-stop.
Remove this warning, we need more fixes to make it true.
Reported-by: Luke Macken <lmacken@redhat.com>
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/tty/serial')
0 files changed, 0 insertions, 0 deletions