Free RAM gradually decreases until machine crashes

[harshalvora]

Hi,

We have upgraded to https://github.com/raspberrypi/linux.git kernel 3.14.0
Upgrading kernel has solved a lot of issues, but now we have this new issue.
We get a stack trace as shown below and after that the RAM in the raspberry pi goes down gradually from 300MB to 2-3MB
At this stage the OOM killer kills a few processes to get some free RAM, but then again the memory keeps going down and eventually the machine crashes.
If required we can show you a graph of free memory on how it keeps decreasing.
We are noticing this same behaviour in different raspberry pi's (both model A and model B) and all running identical kernel and same other processes.


Apr 19 08:04:08 localhost kernel: [ 3720.478285] device wlan0-mon0 entered promiscuous mode
Apr 19 08:04:15 localhost kernel: [ 3726.966336] net_ratelimit: 2 callbacks suppressed
Apr 19 08:04:18 localhost ntpdate[4269]: adjust time server 120.88.47.10 offset 0.000133 sec
Apr 19 08:04:25 localhost kernel: [ 3737.399383] wlan0: failed to move IBSS STA a0:f3:c1:2f:d4:34 to state 3 (-105) - keeping it anyway
Apr 19 08:04:27 localhost kernel: [ 3738.510453] ------------[ cut here ]------------
Apr 19 08:04:27 localhost kernel: [ 3738.516737] WARNING: CPU: 0 PID: 2188 at kernel/workqueue.c:1393 __queue_work+0x21c/0x294()
Apr 19 08:04:27 localhost kernel: [ 3738.528121] Modules linked in: nfnetlink_log nfnetlink ipv6 batman_adv arc4 ath9k_htc mac80211 ath9k_common ath9k_hw ath cfg80211 rfkill leds_gpio led_class spi_bcm2708 i2c_bcm2708
Apr 19 08:04:27 localhost kernel: [ 3738.549312] CPU: 0 PID: 2188 Comm: kworker/u2:0 Tainted: G W 3.14.0 #3
Apr 19 08:04:27 localhost kernel: [ 3738.560481] Workqueue: phy0 ieee80211_iface_work [mac80211]
Apr 19 08:04:27 localhost kernel: [ 3738.567903] [<c0013f48>] (unwind_backtrace) from [<c001124c>] (show_stack+0x10/0x14)
Apr 19 08:04:27 localhost kernel: [ 3738.579231] [<c001124c>] (show_stack) from [<c001f460>] (warn_slowpath_common+0x68/0x88)
Apr 19 08:04:27 localhost kernel: [ 3738.590995] [<c001f460>] (warn_slowpath_common) from [<c001f49c>] (warn_slowpath_null+0x1c/0x24)
Apr 19 08:04:27 localhost kernel: [ 3738.603597] [<c001f49c>] (warn_slowpath_null) from [<c0032e6c>] (__queue_work+0x21c/0x294)
Apr 19 08:04:27 localhost kernel: [ 3738.615814] [<c0032e6c>] (__queue_work) from [<c0032f54>] (queue_work_on+0x5c/0x64)
Apr 19 08:04:27 localhost kernel: [ 3738.627891] [<c0032f54>] (queue_work_on) from [<bf108660>] (ieee80211_rx_mgmt_probe_beacon+0x48c/0x648 [mac80211])
Apr 19 08:04:27 localhost kernel: [ 3738.643050] [<bf108660>] (ieee80211_rx_mgmt_probe_beacon [mac80211]) from [<bf108ca0>] (ieee80211_ibss_rx_queued_mgmt+0xf4/0x33c [mac80211])
Apr 19 08:04:27 localhost kernel: [ 3738.660660] [<bf108ca0>] (ieee80211_ibss_rx_queued_mgmt [mac80211]) from [<bf10a8c0>] (ieee80211_iface_work+0x1bc/0x2c4 [mac80211])
Apr 19 08:04:27 localhost kernel: [ 3738.677324] [<bf10a8c0>] (ieee80211_iface_work [mac80211]) from [<c00343c8>] (process_one_work+0x12c/0x36c)
Apr 19 08:04:27 localhost kernel: [ 3738.691710] [<c00343c8>] (process_one_work) from [<c0034a50>] (worker_thread+0x118/0x3c4)
Apr 19 08:04:27 localhost kernel: [ 3738.704512] [<c0034a50>] (worker_thread) from [<c003a248>] (kthread+0xbc/0xd8)
Apr 19 08:04:27 localhost kernel: [ 3738.714114] [<c003a248>] (kthread) from [<c000e1f8>] (ret_from_fork+0x14/0x3c)
Apr 19 08:04:27 localhost kernel: [ 3738.723646] ---[ end trace 73244bee8b3d23b5 ]---

Thanks,
Regards,

[pluggy]

Wouldn't posting the issue on Github be more appropriate ?