manager: extend crash logs a bit
manager: extend crash logs a bit

Also print all previous crashes to estimate how corrupted the kernel can be,
and for how long we are running.

google/syzkaller,xairy/syzkaller,sploving/syzkaller,lorenzo-stoakes/syzkaller,hyz0906/syzkaller,xairy/syzkaller,zoulasc/syzkaller,sploving/syzkaller,sploving/syzkaller,zoulasc/syzkaller,google/syzkaller,google/syzkaller,xairy/syzkaller,hyz0906/syzkaller,dotweiba/syzkaller,zoulasc/syzkaller,xairy/syzkaller,dotweiba/syzkaller,lorenzo-stoakes/syzkaller,xairy/syzkaller,hyz0906/syzkaller,zoulasc/syzkaller,google/syzkaller,hyz0906/syzkaller,dotweiba/syzkaller,google/syzkaller,lorenzo-stoakes/syzkaller,dotweiba/syzkaller,google/syzkaller,sploving/syzkaller,hyz0906/syzkaller,google/syzkaller,xairy/syzkaller,xairy/syzkaller