Em Thu, Nov 30, 2017 at 09:20:26AM +0100, Peter Zijlstra escreveu: > On Thu, Nov 30, 2017 at 10:32:19AM +0800, Fengguang Wu wrote: > > Hello, > > > > FYI this happens in mainline kernel 4.15.0-rc1. > > It looks like a new regression and hard to bisect. > > > > It occurs in 1 out of 57 boots. > > > > [ 10.009610] chown (367) used greatest stack depth: 26944 bytes left > > Kernel tests: Boot OK! > > [ 30.357729] trinity-main uses obsolete (PF_INET,SOCK_PACKET) > > [ 31.301433] sock: process `trinity-main' is using obsolete setsockopt > > SO_BSDCOMPAT > > [ 31.310289] > > ================================================================== > > [ 31.311490] BUG: KASAN: slab-out-of-bounds in > > perf_callchain_user+0x494/0x530: > > perf_callchain_store at > > include/linux/perf_event.h:1128 > > (inlined by) > > perf_callchain_user at arch/x86/events/core.c:2485 > > I don't think we recently changed anything here... > > But I do have vague memories of something being off here; I never quite > could penetrate the max_stack / contexts_maxed stuff, and istr acme was > going to have a peek. Sure, but I saw some backward ring buffer stuff in there as well, no? IIRC that came after the max-stack code, Adding Wang to the CC list.
- Arnaldo
