On Wed, Aug 29, 2018 at 06:10:01PM +0000, Sid Hayn wrote: > I rebuilt wireless-testing (which updated today) with > CONFIG_DEBUG_KMEMLEAK=y. I am still able to replicate the issue, and > presently have 4 devices in the "No space left on device" state. > > This is from /sys/kernel/debug/kmemleak: > > unreferenced object 0xffff9183f9a4d000 (size 2048): > comm "iwconfig", pid 14872, jiffies 4295540797 (age 1233.338s) > hex dump (first 32 bytes): > 46 00 00 00 00 00 00 00 05 00 00 00 00 00 00 00 F............... > 12 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ > backtrace: > [<000000003ec4c8c4>] sta_set_sinfo+0x5d2/0x890 [mac80211] > [<000000008bbf0699>] ieee80211_get_station+0x4b/0x70 [mac80211] > [<0000000030cbddbc>] cfg80211_wext_giwrate+0xdb/0x140 [cfg80211] > [<000000001e9277be>] ioctl_standard_call+0x49/0xd0 > [<00000000a0eeae49>] wext_handle_ioctl+0xbe/0x120 > [<00000000832bf9a4>] sock_ioctl+0x164/0x360 > [<00000000d3578d89>] do_vfs_ioctl+0xa3/0x6c0 > [<0000000036a4185e>] ksys_ioctl+0x6b/0x80 > [<00000000e8443423>] __x64_sys_ioctl+0x11/0x20 > [<00000000e2ddce89>] do_syscall_64+0x50/0xf0 > [<000000005d6a8051>] entry_SYSCALL_64_after_hwframe+0x44/0xa9 > [<00000000e724c32b>] 0xffffffffffffffff I do not see what can leak here. Did you run clear and scan commands, i.e: echo clear > /sys/kernel/debug/kmemleak Run test echo scan > /sys/kernel/debug/kmemleak cat /sys/kernel/debug/kmemleak to get results ? I forgot that this is required (full docs can be found here: https://www.kernel.org/doc/html/v4.16/dev-tools/kmemleak.html). > None of my scripts directly use iwconfig, but it is possible that > wpa_supplicant or dhcpcd invoke it (although a grep of their source > code indicates they do not). In case it matters, this is what my > wpa_supplicant invokation looks like: > > wpa_supplicant -Dnl80211 -i ${interface} -c test_config/${conffile} > > I am leaving the system in this state for now, I can resume from > broken or reboot to working for whatever testing you suggest next. > This is a test rig, so it takes a few but I'm happy to rebuild > whatever you want however you want it to debug this. You can move /usr/sbin/iwconfig somewhere and see what will fail, or remove WEXT support from kernel, perhaps that itself will solve the problem ;-) Regards Stanislaw
