I'm experiencing the same problem attempting to connect to eduroam, wpa_supplicant contains:

network={
     ssid="eduroam"
     identity="<username>@<institution>"
     password="<password>"
     eap=PEAP
     phase1="peaplabel=0"
     phase2="auth=MSCHAPV2"
     key_mgmt=WPA-EAP
     scan_ssid=1
}

Kernel error is similar:

Jun 20 18:42:41 raspberrypi kernel: [  609.883403] ------------[ cut here ]------------
Jun 20 18:42:41 raspberrypi kernel: [  609.883546] WARNING: CPU: 2 PID: 483 at drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c:5126 brcmf_cfg80211
_set_pmk+0x6c/0x80 [brcmfmac]
Jun 20 18:42:41 raspberrypi kernel: [  609.883556] Modules linked in: rfcomm bnep hci_uart btbcm serdev bluetooth ecdh_generic fuse 8021q garp stp llc evdev v
3d vc4 gpu_sched drm_kms_helper snd_soc_core snd_bcm2835(C) drm brcmfmac snd_compress brcmutil snd_pcm_dmaengine syscopyarea sysfillrect sysimgblt raspberrypi
_hwmon sha256_generic fb_sys_fops drm_panel_orientation_quirks snd_pcm hwmon cfg80211 snd_timer rfkill snd bcm2835_v4l2(C) bcm2835_codec(C) v4l2_common videob
uf2_vmalloc v4l2_mem2mem bcm2835_mmal_vchiq(C) videobuf2_dma_contig videobuf2_memops videobuf2_v4l2 videobuf2_common videodev media argon_mem fixed uio_pdrv_g
enirq uio i2c_dev ip_tables x_tables ipv6
Jun 20 18:42:41 raspberrypi kernel: [  609.884075] CPU: 2 PID: 483 Comm: wpa_supplicant Tainted: G        WC        4.19.50-v7l+ #895
Jun 20 18:42:41 raspberrypi kernel: [  609.884083] Hardware name: BCM2835
Jun 20 18:42:41 raspberrypi kernel: [  609.884115] [<c0212c80>] (unwind_backtrace) from [<c020d49c>] (show_stack+0x20/0x24)
Jun 20 18:42:41 raspberrypi kernel: [  609.884136] [<c020d49c>] (show_stack) from [<c0978f60>] (dump_stack+0xd4/0x118)
Jun 20 18:42:41 raspberrypi kernel: [  609.884157] [<c0978f60>] (dump_stack) from [<c0222270>] (__warn+0x104/0x11c)
Jun 20 18:42:41 raspberrypi kernel: [  609.884173] [<c0222270>] (__warn) from [<c02223c0>] (warn_slowpath_null+0x50/0x58)
Jun 20 18:42:41 raspberrypi kernel: [  609.884294] [<c02223c0>] (warn_slowpath_null) from [<bf5b8ae0>] (brcmf_cfg80211_set_pmk+0x6c/0x80 [brcmfmac])
Jun 20 18:42:41 raspberrypi kernel: [  609.884551] [<bf5b8ae0>] (brcmf_cfg80211_set_pmk [brcmfmac]) from [<bf2debfc>] (nl80211_set_pmk+0x160/0x26c [cfg80211])
Jun 20 18:42:41 raspberrypi kernel: [  609.884697] [<bf2debfc>] (nl80211_set_pmk [cfg80211]) from [<c08b3784>] (genl_rcv_msg+0x244/0x464)
Jun 20 18:42:41 raspberrypi kernel: [  609.884714] [<c08b3784>] (genl_rcv_msg) from [<c08b277c>] (netlink_rcv_skb+0x104/0x138)
Jun 20 18:42:41 raspberrypi kernel: [  609.884728] [<c08b277c>] (netlink_rcv_skb) from [<c08b3530>] (genl_rcv+0x34/0x44)
Jun 20 18:42:41 raspberrypi kernel: [  609.884742] [<c08b3530>] (genl_rcv) from [<c08b1e9c>] (netlink_unicast+0x1b0/0x234)
Jun 20 18:42:41 raspberrypi kernel: [  609.884756] [<c08b1e9c>] (netlink_unicast) from [<c08b22c0>] (netlink_sendmsg+0x2dc/0x364)
Jun 20 18:42:41 raspberrypi kernel: [  609.884771] [<c08b22c0>] (netlink_sendmsg) from [<c0842968>] (sock_sendmsg+0x24/0x34)
Jun 20 18:42:41 raspberrypi kernel: [  609.884789] [<c0842968>] (sock_sendmsg) from [<c08431b4>] (___sys_sendmsg+0x214/0x228)
Jun 20 18:42:41 raspberrypi kernel: [  609.884805] [<c08431b4>] (___sys_sendmsg) from [<c0844288>] (__sys_sendmsg+0x60/0xa0)
Jun 20 18:42:41 raspberrypi kernel: [  609.884821] [<c0844288>] (__sys_sendmsg) from [<c08442e4>] (sys_sendmsg+0x1c/0x20)
Jun 20 18:42:41 raspberrypi kernel: [  609.884838] [<c08442e4>] (sys_sendmsg) from [<c0201000>] (ret_fast_syscall+0x0/0x28)
Jun 20 18:42:41 raspberrypi kernel: [  609.884847] Exception stack(0xda8dbfa8 to 0xda8dbff0)
Jun 20 18:42:41 raspberrypi kernel: [  609.884859] bfa0:                   020c9228 02103bc8 00000004 bebddfc0 00000000 00000000
Jun 20 18:42:41 raspberrypi kernel: [  609.884872] bfc0: 020c9228 02103bc8 020c91b0 00000128 b6f3b000 ffffffff 00000001 00000004
Jun 20 18:42:41 raspberrypi kernel: [  609.884882] bfe0: 0000006c bebddf78 b6f205bc b6a86980
Jun 20 18:42:41 raspberrypi kernel: [  609.884892] ---[ end trace 5502fb75e4f34b0f ]---