https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=253608
Bug ID: 253608
Summary: hostapd 100% CPU usage after WiFi device disappears
Product: Base System
Version: 12.2-STABLE
Hardware: arm64
OS: Any
Status: New
Severity: Affects Some People
Priority: ---
Component: wireless
Assignee: wirel...@freebsd.org
Reporter: damjan....@gmail.com
Some other bug causes my USB bus to sporadically undergo some kind of reset,
making all USB devices appear to disconnect and then reconnect.
One of my USB devices is a WiFi dongle, which hostapd is running with. When it
disconnects, hostapd CPU usage jumps to 100%, and stays there until manually
killed:
# truss -s 1024 -f -p 34705
34705: read(5,0x80121f2c0,524288) ERR#6 'Device not configured'
34705: select(7,{ 4 5 6 },{ },{ },{ 2.635212 }) = 1 (0x1)
34705: read(5,0x80121f2c0,524288) ERR#6 'Device not configured'
34705: select(7,{ 4 5 6 },{ },{ },{ 2.635171 }) = 1 (0x1)
34705: read(5,0x80121f2c0,524288) ERR#6 'Device not configured'
34705: select(7,{ 4 5 6 },{ },{ },{ 2.635120 }) = 1 (0x1)
34705: read(5,0x80121f2c0,524288) ERR#6 'Device not configured'
34705: select(7,{ 4 5 6 },{ },{ },{ 2.635069 }) = 1 (0x1)
34705: read(5,0x80121f2c0,524288) ERR#6 'Device not configured'
34705: select(7,{ 4 5 6 },{ },{ },{ 2.635001 }) = 1 (0x1)
# lsof -n |grep hostapd
hostapd 34705 root cwd VDIR 2669942718,3349274250
36 4 /
hostapd 34705 root rtd VDIR 2669942718,3349274250
36 4 /
hostapd 34705 root 0u VCHR 0,16
0t0 16 /dev/null
hostapd 34705 root 1u VCHR 0,16
0t0 16 /dev/null
hostapd 34705 root 2u VCHR 0,16
0t0 16 /dev/null
hostapd 34705 root 3u IPv4 0xfffff80016a2b040
0t0 UDP *:*
hostapd 34705 root 4u rte 0xfffff8001334b1e0
0t0
hostapd 34705 root 5u VCHR 0,40
0t0 40 /dev/bpf
hostapd 34705 root 6u unix 0xfffff8011139e000
0t0 /var/run/hostapd/wlan0
hostapd 34705 root 7r VDIR 2669942718,3349274250
43 712 /var/run
hostapd 34705 root 8w VREG 2669942718,3349274250
5 262304 /var/run/hostapd.pid
I consider this a hostapd bug, because the WiFi dongle could also get unplugged
manually to reproduce it.
When a WiFi device disappears, hostapd should do something better than get
stuck in an infinite loop.
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