On Wed, 17 Jun 2015 19:32:26 -0400 (EDT) Vince Weaver <[email protected]> wrote:
> > The fuzzer triggered another warning in the PERF_EVENT_IOC_SET_FILTER > code. This is with the previous filter patch applied. > > >From what I can tell the filter was: > nfs4:nfs4_fsinfo > (((fhandle~601)&&valid&809)&&common_type>=860) Hmm, I can't trigger this with the filter file, can you? echo '(((fhandle~601)&&valid&809)&&common_type>=860)' > \ /sys/kernel/debug/tracing/events/nfs4/nfs4_fsinfo/filter I'll write a user app to use the perf syscall and see if that is different, but in the mean time, can you try the above. Thanks! -- Steve > > The warning in question: > WARN_ON_ONCE(cnt < 0); > in check_preds(). > > [65903.660154] WARNING: CPU: 1 PID: 731 at > kernel/trace/trace_events_filter.c:1388 replace_preds+0x2e4/0xa50() > [65903.748080] CPU: 1 PID: 731 Comm: perf_fuzzer Tainted: G W > 4.1.0-rc8+ #157 > [65903.757203] Hardware name: LENOVO 10AM000AUS/SHARKBAY, BIOS FBKT72AUS > 01/26/2014 > [65903.765711] ffffffff81a1ac00 ffff880117117cb8 ffffffff816d7419 > 0000000000000000 > [65903.774323] 0000000000000000 ffff880117117cf8 ffffffff81072eba > 0000000000000005 > [65903.782924] 0000000000000003 ffff8800366bd018 ffff8800366bd000 > ffff8800cf3e9220 > [65903.791516] Call Trace: > [65903.794688] [<ffffffff816d7419>] dump_stack+0x45/0x57 > [65903.800732] [<ffffffff81072eba>] warn_slowpath_common+0x8a/0xc0 > [65903.807712] [<ffffffff81072faa>] warn_slowpath_null+0x1a/0x20 > [65903.814477] [<ffffffff8114b1c4>] replace_preds+0x2e4/0xa50 > [65903.820974] [<ffffffff8114c2c3>] ? ftrace_profile_set_filter+0x23/0x100 > [65903.828640] [<ffffffff8114b9b2>] create_filter+0x82/0xb0 > [65903.834917] [<ffffffff8114c2f4>] ftrace_profile_set_filter+0x54/0x100 > [65903.842436] [<ffffffff811909eb>] ? strndup_user+0x4b/0xc0 > [65903.848794] [<ffffffff81166290>] perf_ioctl+0x170/0x4d0 > [65903.854959] [<ffffffff812023d0>] do_vfs_ioctl+0x2e0/0x4e0 > [65903.861286] [<ffffffff816dcdfe>] ? mutex_unlock+0xe/0x10 > [65903.867492] [<ffffffff81164756>] ? perf_event_task_enable+0xb6/0xd0 > [65903.874754] [<ffffffff81202651>] SyS_ioctl+0x81/0xa0 > [65903.880655] [<ffffffff816df372>] system_call_fastpath+0x16/0x7a > [65903.887534] ---[ end trace 48137d0593a025d9 ]--- -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
