14.10.2016 02:23, Maxim Patlasov пишет:
Stas,
The series look fine, so:
Acked-by: Maxim Patlasov <mpatla...@virtuozzo.com>
But, please, refine the description of the second patch. It must
explain clearly why the patch fixes the problem:
block_sigs() blocks ordinary non-fatal signals as expected, but
surprisingly SIGTRAP is special: it does not matter whether it comes
before or after block_sigs(), the latter does not affect SIGTRAP at
all! And in contrast, wait_event_killable() is immune to it -- only
fatal sig can wake it up.
No, Maxim. You make a mistake here.
There is nothing special with SIGTRAP (although it's being sometimes
sent via force_sig_info()).
The problem is described as it is: block_sigs() doesn't (!) clear
TIG_SIGPENDING flag. All it does is blocking future signals to arrive.
Moreover, __set_task_blocked() call recalc_sigpending(), which check
whether any of the signals to block is present in process pending mask,
and if so - set (!) TIF_SIGPENDING on the task.
IOW, any pending signal remains pending after call to blocks_sigs().
And that's is the root of the issue (as it described in the patch comment).
Thanks,
Maxim
On 10/13/2016 03:03 AM, Stanislav Kinsburskiy wrote:
This patch fixes wrong SIGBUS result in page fault handler for fuse
file, when
process received a signal.
https://jira.sw.ru/browse/PSBM-53581
---
Stanislav Kinsburskiy (2):
new helper: wait_event_killable_exclusive()
fuse: handle only fatal signals while waiting request answer
fs/fuse/dev.c | 42 ++++++++++++++++--------------------------
include/linux/wait.h | 26 ++++++++++++++++++++++++++
2 files changed, 42 insertions(+), 26 deletions(-)
--
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