On Wed, 7 Sep 2016, Alexander Shishkin wrote: > Vince Weaver <vi...@deater.net> writes: > > > On Wed, 7 Sep 2016, Alexander Shishkin wrote: > > > >> Sure. And yes, I did catch a warning, which calls for one more patch > >> (below). Also one unrelated thing in PEBS that Peter fixed. > > > > Does that fix this which I just got on my skylake machine (4.8-rc5 with > > your other 5 patches applied) > > > > [ 5351.822559] WARNING: CPU: 3 PID: 19191 at > > arch/x86/events/intel/bts.c:344 event_function+0xa1/0x160 > > Yes, it fixes a problem that triggered this warning. Can't tell from the > absence of backtrace what's going on here, though.
On the skylake machine with the original 5 patches I got this after continuing to fuzz. Sorry about the lack of frame pointer, next compile will have it enabled. If it matters, prior to this I hit the unrelated [25510.278199] WARNING: CPU: 1 PID: 25405 at kernel/events/core.c:3554 perf_event_read+0x18f/0x1a0 [28682.174684] WARNING: CPU: 7 PID: 31992 at kernel/events/core.c:4961 perf_mmap_close+0x2e1/0x2f0 [28682.280579] CPU: 7 PID: 31992 Comm: perf_fuzzer Tainted: G W 4.8.0-rc5+ #3 [28682.288739] Hardware name: LENOVO 10FY0017US/SKYBAY, BIOS FWKT53A 06/06/2016 [28682.296096] 0000000000000286 000000008e07b373 ffffffff8cf1f9f5 0000000000000000 [28682.303738] 0000000000000000 ffffffff8cc7b624 ffff9c676e780e00 ffff9c676e029280 [28682.311362] ffff9c6772ab3398 ffff9c676e029000 ffff9c676e780bb0 ffff9c676f7c0280 [28682.319036] Call Trace: [28682.321529] [<ffffffff8cf1f9f5>] ? dump_stack+0x5c/0x77 [28682.326939] [<ffffffff8cc7b624>] ? __warn+0xc4/0xe0 [28682.332018] [<ffffffff8cd6dc01>] ? perf_mmap_close+0x2e1/0x2f0 [28682.338083] [<ffffffff8cd664b0>] ? perf_iterate_ctx+0x150/0x150 [28682.344218] [<ffffffff8cdb5e7d>] ? remove_vma+0x2d/0x70 [28682.349662] [<ffffffff8cdb84d6>] ? do_munmap+0x246/0x400 [28682.355197] [<ffffffff8cdb8c1b>] ? SyS_munmap+0x4b/0x70 [28682.360612] [<ffffffff8cc03b6f>] ? do_syscall_64+0x5f/0x160 [28682.366404] [<ffffffff8d1e7b65>] ? entry_SYSCALL64_slow_path+0x25/0x25 [28682.373149] ---[ end trace bc7b0b7d0c024d62 ]--- [28682.377975] ------------[ cut here ]------------ [28682.382681] WARNING: CPU: 4 PID: 0 at kernel/events/ring_buffer.c:543 __rb_free_aux+0x110/0x120 [28682.489412] CPU: 4 PID: 0 Comm: swapper/4 Tainted: G W 4.8.0-rc5+ #3 [28682.498106] Hardware name: LENOVO 10FY0017US/SKYBAY, BIOS FWKT53A 06/06/2016 [28682.506518] 0000000000000086 6d2f07ae6326ed5e ffffffff8cf1f9f5 0000000000000000 [28682.515223] 0000000000000000 ffffffff8cc7b624 ffff9c676e780e00 ffff9c677dd0b740 [28682.523996] 0000000000000000 ffff9c676e029000 ffff9c676e780e00 00001a16168dab54 [28682.532867] Call Trace: [28682.536458] <IRQ> [<ffffffff8cf1f9f5>] ? dump_stack+0x5c/0x77 [28682.543615] [<ffffffff8cc7b624>] ? __warn+0xc4/0xe0 [28682.549741] [<ffffffff8cd700e0>] ? __rb_free_aux+0x110/0x120 [28682.556829] [<ffffffff8cd70f3a>] ? perf_aux_output_end+0xba/0x100 [28682.564312] [<ffffffff8cc0c9e1>] ? bts_event_stop+0xc1/0x130 [28682.571238] [<ffffffff8cd63a00>] ? perf_cgroup_attach+0x70/0x70 [28682.578402] [<ffffffff8cd621f0>] ? __perf_event_stop+0x40/0x60 [28682.585484] [<ffffffff8cd63a3a>] ? remote_function+0x3a/0x40 [28682.592644] [<ffffffff8ccfad46>] ? flush_smp_call_function_queue+0x76/0x160 [28682.600867] [<ffffffff8cc4e6e9>] ? smp_trace_call_function_single_interrupt+0x29/0xc0 [28682.609914] [<ffffffff8d1e9ce2>] ? trace_call_function_single_interrupt+0x82/0x90 [28682.618608] <EOI> [<ffffffff8d0a9d13>] ? cpuidle_enter_state+0x113/0x260 [28682.626570] [<ffffffff8ccbd7dc>] ? cpu_startup_entry+0x2cc/0x370 [28682.633675] [<ffffffff8cc4f07d>] ? start_secondary+0x14d/0x190 [28682.640749] ---[ end trace bc7b0b7d0c024d63 ]---
