With 3.19.0-rc2-2.gcd0d0f3-desktop from Kernel:HEAD following occurs:
# modprobe efi-pstore
# dmesg
...
[ 852.541314] pstore: Efi pstore disabled, enforce via pstore.backend=efi
[ 852.548445] pstore: On a broken BIOS, this can severely harm your system
[ 852.573435] pstore: Only enable efi based pstore when you know what you are
doing
[ 852.597995] ------------[ cut here ]------------
[ 852.639750] WARNING: CPU: 1 PID: 3334 at ../init/main.c:813
do_one_initcall+0x1e1/0x210()
[ 852.667114] initcall efivars_pstore_init+0x0/0x1000 [efi_pstore] returned
with preemption imbalance
[ 852.715098] Modules linked in: efi_pstore(+) nf_log_ipv6 xt_pkttype
nf_log_ipv4 nf_log_common xt_LOG xt_limit ebtable_filter ses ebtables enclosure
nfsd auth_rpcgss nfs nfs_acl iscsi_tcp libiscsi_tcp lockd libiscsi
scsi_transport_iscsi grace sunrpc fscache iscsi_ibft iscsi_boot_sysfs af_packet
ip6t_REJECT xt_tcpudp nf_conntrack_ipv6 nf_defrag_ipv6 ip6table_raw ipt_REJECT
iptable_raw xt_CT iptable_filter ip6table_mangle nf_conntrack_netbios_ns
nf_conntrack_broadcast nf_conntrack_ipv4 nf_defrag_ipv4 ip_tables xt_conntrack
nf_conntrack ip6table_filter ip6_tables x_tables nls_iso8859_1 nls_cp437 vfat
fat cdc_ether usbnet mii iTCO_wdt ipmi_ssif ipmi_devintf coretemp dm_mod
iTCO_vendor_support ioatdma tpm_tis dca tpm bnx2 kvm_intel 8250_fintek
i7core_edac ipmi_si i2c_i801 lpc_ich processor kvm edac_core
[ 852.963422] ipmi_msghandler button shpchp serio_raw pcspkr mfd_core
efivarfs btrfs xor raid6_pq sr_mod cdrom ata_generic syscopyarea sysfillrect
sysimgblt i2c_algo_bit drm_kms_helper ata_piix crc32c_intel ttm drm
megaraid_sas sg
[ 853.056942] CPU: 0 PID: 3334 Comm: modprobe Not tainted
3.19.0-rc2-2.gcd0d0f3-desktop #1
[ 853.089920] Hardware name: IBM System x3550 M3 -[7944K1G]-/69Y4438 ,
BIOS -[D6E158AUS-1.16]- 11/26/2012
[ 853.149704] 0000000000000000 ffffffff81a21d29 ffffffff81663626
ffff88007169fcc8
[ 853.182970] ffffffff81062121 0000000000000000 ffff880074886500
0000000000000000
[ 853.216147] ffffffffa00ae000 0000000000000001 ffffffff8106219a
ffffffff81a22110
[ 853.249089] Call Trace:
[ 853.276674] [<ffffffff810055ac>] dump_trace+0x8c/0x340
[ 853.307321] [<ffffffff81005903>] show_stack_log_lvl+0xa3/0x190
[ 853.341551] [<ffffffff81007051>] show_stack+0x21/0x50
[ 853.374524] [<ffffffff81663626>] dump_stack+0x47/0x67
[ 853.406770] [<ffffffff81062121>] warn_slowpath_common+0x81/0xb0
[ 853.440322] [<ffffffff8106219a>] warn_slowpath_fmt+0x4a/0x50
[ 853.470296] [<ffffffff81000421>] do_one_initcall+0x1e1/0x210
[ 853.499580] [<ffffffff810e3fe6>] load_module+0x2216/0x2630
[ 853.528784] [<ffffffff810e4555>] SYSC_finit_module+0x75/0xa0
[ 853.557813] [<ffffffff81669f2d>] system_call_fastpath+0x16/0x1b
[ 853.586700] [<00007f564eb99829>] 0x7f564eb99829
[ 853.615031] ---[ end trace fe46c6f82b5ad556 ]---
Issue does not occur with vanilla kernel from Kernel:HEAD