blktrace may pass big trace buffer size via '-b', meantime the system may have lots of CPU cores, so too much memory can be allocated for blktrace.
The 1st patch shutdown bltrace in blkdev_close() in case of task exiting, for avoiding trace buffer leak. The 2nd patch limits max trace buffer size for avoiding potential OOM. Ming Lei (2): block: shutdown blktrace in case of fatal signal pending blktrace: limit allowed total trace buffer size fs/block_dev.c | 6 ++++++ kernel/trace/blktrace.c | 32 ++++++++++++++++++++++++++++++++ 2 files changed, 38 insertions(+) -- 2.29.2
