netdev - [RFC PATCH] ehea: use GFP_NOWAIT in ehea_error

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Date:	Wed, 16 Apr 2014 11:07:00 +0800
From:	Li Zhong <zhong@...ux.vnet.ibm.com>
To:	NetDev <netdev@...r.kernel.org>
Cc:	cascardo@...ux.vnet.ibm.com
Subject: [RFC PATCH] ehea:  use GFP_NOWAIT in ehea_error_data()

I found following sleeping function called from invalid context complain
while trying memory hot add/remove. 

As it could be called in atomic context, use GFP_NOWAIT here.

[64523.378595] BUG: sleeping function called from invalid context at mm/page_alloc.c:2706
[64523.378599] in_atomic(): 1, irqs_disabled(): 1, pid: 18546, name: drmgr
[64523.378605] CPU: 0 PID: 18546 Comm: drmgr Tainted: G        W     3.15.0-rc1+ #4
[64523.378608] Call Trace:
[64523.378616] [c000000ed7fd3690] [c000000000015f50] .show_stack+0x130/0x200 (unreliable)
[64523.378624] [c000000ed7fd3760] [c0000000008bd314] .dump_stack+0xa0/0xdc
[64523.378630] [c000000ed7fd37e0] [c0000000000e28cc] .__might_sleep+0x13c/0x170
[64523.378637] [c000000ed7fd3870] [c0000000001e6734] .__alloc_pages_nodemask+0x3f4/0xca0
[64523.378643] [c000000ed7fd3a30] [c00000000023bd3c] .alloc_pages_current+0xcc/0x170
[64523.378648] [c000000ed7fd3ad0] [c0000000001df520] .__get_free_pages+0x30/0xb0
[64523.378668] [c000000ed7fd3b50] [d0000000077dad10] .ehea_error_data+0x40/0x1b0 [ehea]
[64523.378674] [c000000ed7fd3bf0] [d0000000077d3afc] .ehea_qp_aff_irq_handler+0x9c/0x110 [ehea]
[64523.378680] [c000000ed7fd3c90] [c00000000011d144] .handle_irq_event_percpu+0x94/0x2f0
[64523.378685] [c000000ed7fd3d60] [c00000000011d400] .handle_irq_event+0x60/0xa0
[64523.378689] [c000000ed7fd3df0] [c000000000122314] .handle_fasteoi_irq+0xe4/0x290
[64523.378693] [c000000ed7fd3e80] [c00000000011c244] .generic_handle_irq+0x54/0x80
[64523.378698] [c000000ed7fd3f00] [c000000000010f30] .__do_irq+0x90/0x200
[64523.378703] [c000000ed7fd3f90] [c000000000024bc8] .call_do_irq+0x14/0x24
[64523.378707] [c000000ec50fefe0] [c000000000011138] .do_IRQ+0x98/0x110
[64523.378712] [c000000ec50ff090] [c000000000002394] hardware_interrupt_common+0x114/0x180
[64523.378718] --- Exception: 501 at .arch_local_irq_restore+0x74/0x90
[64523.378718]     LR = .arch_local_irq_restore+0x74/0x90
[64523.378724] [c000000ec50ff380] [c0000000000a855c] .wakeup_softirqd+0x3c/0x50 (unreliable)
[64523.378731] [c000000ec50ff3f0] [c000000000751fd0] .__netif_schedule+0xb0/0x100
[64523.378736] [c000000ec50ff470] [d0000000077d268c] .ehea_rereg_mrs+0x9dc/0xb40 [ehea]
[64523.378741] [c000000ec50ff5d0] [d0000000077d295c] .ehea_mem_notifier+0x16c/0x180 [ehea]
[64523.378748] [c000000ec50ff660] [c0000000008b184c] .notifier_call_chain+0x8c/0x100
[64523.378754] [c000000ec50ff700] [c0000000000d896c] .__blocking_notifier_call_chain+0x6c/0xe0
[64523.378761] [c000000ec50ff7a0] [c00000000055e2e8] .memory_notify+0x38/0x60
[64523.378766] [c000000ec50ff820] [c000000000265ae8] .__offline_pages.constprop.16+0x2a8/0xa20
[64523.378771] [c000000ec50ff990] [c00000000055e190] .memory_subsys_offline+0x70/0xe0
[64523.378776] [c000000ec50ffa10] [c00000000053f6c8] .device_offline+0xf8/0x140
[64523.378780] [c000000ec50ffaa0] [c00000000055ddd0] .store_mem_state+0x150/0x210
[64523.378785] [c000000ec50ffb30] [c00000000053b8c4] .dev_attr_store+0x64/0xa0
[64523.378790] [c000000ec50ffbc0] [c000000000311f4c] .sysfs_kf_write+0x7c/0xb0
[64523.378794] [c000000ec50ffc50] [c000000000310fd4] .kernfs_fop_write+0x154/0x1e0
[64523.378800] [c000000ec50ffcf0] [c00000000026b750] .vfs_write+0xe0/0x260
[64523.378804] [c000000ec50ffd90] [c00000000026c444] .SyS_write+0x64/0x110
[64523.378809] [c000000ec50ffe30] [c000000000009ffc] syscall_exit+0x0/0x7c

Signed-off-by: Li Zhong <zhong@...ux.vnet.ibm.com>
---
 drivers/net/ethernet/ibm/ehea/ehea_qmr.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/ibm/ehea/ehea_qmr.c b/drivers/net/ethernet/ibm/ehea/ehea_qmr.c
index 9b03033..fa16897 100644
--- a/drivers/net/ethernet/ibm/ehea/ehea_qmr.c
+++ b/drivers/net/ethernet/ibm/ehea/ehea_qmr.c
@@ -996,7 +996,7 @@ u64 ehea_error_data(struct ehea_adapter *adapter, u64 res_handle,
 	u64 *rblock;
 	u64 type = 0;
 
-	rblock = (void *)get_zeroed_page(GFP_KERNEL);
+	rblock = (void *)get_zeroed_page(GFP_NOWAIT);
 	if (!rblock) {
 		pr_err("Cannot allocate rblock memory\n");
 		goto out;


--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html