On 05/07/2015 05:25 PM, Tejun Heo wrote: > Hello, > > On Thu, May 07, 2015 at 04:05:57PM +0200, Peter Zijlstra wrote: >> On Thu, May 07, 2015 at 02:54:00PM +0100, Tvrtko Ursulin wrote: >>> >>> Hi, >>> >>> 4.1.0-rc2 spews the below warning and disables lockdep for me at boot. >>> >>> Any ideas? >>> >>> May 7 11:58:20 skl kernel: [ 6.066696] futex hash table entries: 1024 >>> (order: 5, 131072 bytes) >>> May 7 11:58:20 skl kernel: [ 6.075774] BUG: key ffff88014973b850 not in >>> .data! > ... >>> May 7 11:58:20 skl kernel: [ 6.188202] [<ffffffff811dc06a>] >>> __kernfs_create_file+0x7a/0xf0 >>> May 7 11:58:20 skl kernel: [ 6.195069] [<ffffffff811dcb4e>] >>> sysfs_add_file_mode_ns+0x16e/0x1b0 >>> May 7 11:58:20 skl kernel: [ 6.202346] [<ffffffff811dd92a>] >>> internal_create_group+0x19a/0x280 >>> May 7 11:58:20 skl kernel: [ 6.209515] [<ffffffff811dda43>] >>> sysfs_create_group+0x13/0x20 >>> May 7 11:58:20 skl kernel: [ 6.216185] [<ffffffff811dda88>] >>> sysfs_create_groups+0x38/0x90 >>> May 7 11:58:20 skl kernel: [ 6.222958] [<ffffffff8145c3d6>] >>> device_add+0x276/0x5d0 >>> May 7 11:58:20 skl kernel: [ 6.229040] [<ffffffff8110a80b>] >>> pmu_dev_alloc+0x8b/0xd0 >>> May 7 11:58:20 skl kernel: [ 6.242184] [<ffffffff81d44cd9>] >>> perf_event_sysfs_init+0x46/0x95 >>> May 7 11:58:20 skl kernel: [ 6.256118] [<ffffffff81000352>] >>> do_one_initcall+0x122/0x1f0 >>> May 7 11:58:20 skl kernel: [ 6.268980] [<ffffffff81d27126>] >>> kernel_init_freeable+0x106/0x19a >>> May 7 11:58:20 skl kernel: [ 6.288120] [<ffffffff8161a38e>] >>> kernel_init+0xe/0xf0 >>> May 7 11:58:20 skl kernel: [ 6.294004] [<ffffffff81629e92>] >>> ret_from_fork+0x42/0x70 >>> May 7 11:58:20 skl kernel: [ 6.306367] ---[ end trace 98f2b03275198a56 >>> ]--- >>> May 7 11:58:20 skl kernel: [ 6.311703] BUG: key ffff88014973b888 not in >>> .data! >>> May 7 11:58:20 skl kernel: [ 6.317300] BUG: key ffff88014973b8c0 not in >>> .data! >>> May 7 11:58:20 skl kernel: [ 6.322895] BUG: key ffff88014973b8f8 not in >>> .data! >>> May 7 11:58:20 skl kernel: [ 6.329549] HugeTLB registered 2 MB page >>> size, pre-allocated 0 pages >> >> That's in sysfs magic mushroom land, lets Cc people who know about this. > > sysfs by default uses lockdep key embedded in attrs. It looks like > somebody is making on-heap copies of attrs and using them as the group > attrs. What's the offending pmu type?
I am not familiar with this area, is this the answer? May 7 11:58:20 skl kernel: [ 0.849877] Performance Events: no PEBS fmt3+, generic architected perfmon, full-width counters, Intel PMU driver. May 7 11:58:20 skl kernel: [ 0.861827] ... version: 4 May 7 11:58:20 skl kernel: [ 0.866406] ... bit width: 48 May 7 11:58:20 skl kernel: [ 0.871083] ... generic registers: 4 May 7 11:58:20 skl kernel: [ 0.875664] ... value mask: 0000ffffffffffff May 7 11:58:20 skl kernel: [ 0.881724] ... max period: 0000ffffffffffff May 7 11:58:20 skl kernel: [ 0.887778] ... fixed-purpose events: 3 May 7 11:58:20 skl kernel: [ 0.892352] ... event mask: 000000070000000f May 7 11:58:20 skl kernel: [ 0.909665] NMI watchdog: enabled on all CPUs, permanently consumes one hw-PMU counter. Regards, Tvrtko -- 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/
