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: [email protected]
Reporter: [email protected]
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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