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9d2b26d5a7
Kernel setting `/proc/sys/kernel/pid_max` can be set up to 4194304 (7 digits) which will cause buffer overflow in busbox lock patch, this often happens when running in a rootfs container environment. This commit enlarges `pidstr` to 12 bytes to ensure a sufficient buffer for pid number and an additional char '\n'. Signed-off-by: Qichao Zhang <njuzhangqichao@gmail.com> (cherry picked from commit 34567750db2c3a84fc9f971189c223e2eefd93b0)