This warning triggered constantly (several times per second) if I use
hostapd with my TP-LINK TL-WDN4800 card (chip: Atheros AR9380). It
floods my kernel logs.
Since it works anyway I suggest change WARN_ON to WARN_ON_ONCE until
this bug is fixed.
On 07/11/2017 10:55 AM, Ortwin Glück wrote:
Hi,
I saw this WARN_ON splat on ath9k in hostap mode. The code triggering
the warning says it's a driver bug.
Thanks for checking.
Ortwin
[629805.015640] ------------[ cut here ]------------
[629805.015695] WARNING: CPU: 2 PID: 0 at net/mac80211/rx.c:630
ieee80211_rx_napi+0x8a5/0xa70
[629805.015735] Modules linked in: radeon ttm
[629805.015740] CPU: 2 PID: 0 Comm: swapper/2 Not tainted 4.12.0 #1
[629805.015750] Hardware name: Apple Inc. iMac11,2/Mac-F2238AC8, BIOS
IM112.88Z.0057.B00.1005031455 05/03/10
[629805.015752] task: ffffa35a370e6300 task.stack: ffffa58840074000
[629805.015754] RIP: 0010:ieee80211_rx_napi+0x8a5/0xa70
[629805.015755] RSP: 0018:ffffa35a3bc83d38 EFLAGS: 00010246
[629805.015756] RAX: 0000000000010000 RBX: ffffa3593987f700 RCX:
0000000000000000
[629805.015771] RDX: 0000000000000004 RSI: 0000000000000001 RDI:
ffffa35a29d0c740
[629805.015772] RBP: ffffa35a3bc83e08 R08: 0000000000000000 R09:
0000000000000001
[629805.015773] R10: 0000000000000000 R11: 0000000000000000 R12:
ffffa35a29d0c740
[629805.015773] R13: 0000000000000000 R14: 0000000000000000 R15:
ffffa35a29d0d500
[629805.015775] FS: 0000000000000000(0000) GS:ffffa35a3bc80000(0000)
knlGS:0000000000000000
[629805.015776] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[629805.015777] CR2: 0000000001f3b038 CR3: 0000000006e0a000 CR4:
00000000000006e0
[629805.015790] Call Trace:
[629805.015792] <IRQ>
[629805.015797] ? swiotlb_tbl_map_single+0x21d/0x2f0
[629805.015812] ? ath9k_cmn_rx_skb_postprocess+0x47/0x130
[629805.015814] ? swiotlb_tbl_unmap_single+0xf0/0x120
[629805.015816] ath_rx_tasklet+0xa28/0xed0
[629805.015819] ath9k_tasklet+0x1db/0x240
[629805.015822] tasklet_action+0x91/0xb0
[629805.015824] __do_softirq+0xd7/0x1d0
[629805.015825] irq_exit+0xab/0xb0
[629805.015828] do_IRQ+0x4a/0xc0
[629805.015831] common_interrupt+0x86/0x86
[629805.015835] RIP: 0010:cpuidle_enter_state+0x15f/0x1f0
[629805.015836] RSP: 0018:ffffa58840077e70 EFLAGS: 00000282 ORIG_RAX:
ffffffffffffff2e
[629805.015837] RAX: ffffa35a3bc98740 RBX: ffffa35a3bc9efb0 RCX:
000000000000001f
[629805.015838] RDX: 20c49ba5e353f7cf RSI: ffffa35a3bc95f58 RDI:
0000000000000000
[629805.015839] RBP: ffffa58840077ea0 R08: ffffa35a3bc959a4 R09:
0000000000000018
[629805.015840] R10: 0000000000000eca R11: 00000000000011e5 R12:
00023ccde83b6cf0
[629805.015841] R13: 0000000000000004 R14: ffffffff84e56e18 R15:
0000000000000004
[629805.015842] </IRQ>
[629805.015845] cpuidle_enter+0x12/0x20
[629805.015848] call_cpuidle+0x1e/0x30
[629805.015849] do_idle+0xdb/0x170
[629805.015850] cpu_startup_entry+0x6c/0x70
[629805.015853] start_secondary+0x143/0x160
[629805.015857] secondary_startup_64+0x9f/0x9f
[629805.015858] Code: ff ff 48 8b 8b d0 00 00 00 4c 8b 82 d0 00 00 00 e9
02 fa ff ff 4c 89 ff 44 8b ad 48 ff ff ff 4c 8b a5 38 ff ff ff e9 5a ff
ff ff <0f> ff 48 89 df e8 11 e5 de ff e9 fb fa ff ff 0f ff e9 2e f8 ff
[629805.015876] ---[ end trace e4857df16afbdba0 ]---
rx.c:
if (ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)) {
if (unlikely(origskb->len <= FCS_LEN)) {
/* driver bug */
WARN_ON(1);
dev_kfree_skb(origskb);
return NULL;
}
present_fcs_len = FCS_LEN;
}
