netdev - swiotlb dyn alloc WARNING splat in wireless-next.

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Date: Sun, 22 Oct 2023 11:48:16 -0700
From: Ben Greear <greearb@...delatech.com>
To: netdev <netdev@...r.kernel.org>
Subject: swiotlb dyn alloc WARNING splat in wireless-next.

Hello,

I saw this in a system with 16GB of RAM running a lot of wifi traffic
on 16 radios.  System appears to mostly be working OK, so not sure if it is
a real problem or not.

[76171.488627] WARNING: CPU: 2 PID: 30169 at mm/page_alloc.c:4402 __alloc_pages+0x19c/0x200
[76171.488634] Modules linked in: tls nf_conntrack_netlink nf_conntrack nfnetlink nf_defrag_ipv6 nf_defrag_ipv4 bpfilter vrf 8021q garp mrp stp llc macvlan 
pktgen rpcrdma rdma_cm iw_cm ib_cm ib_core qrtr f71882fg intel_rapl_msr iTCO_wdt intel_pmc_bxt ee1004 iTCO_vendor_support snd_hda_codec_hdmi 
snd_hda_codec_realtek snd_hda_codec_generic ledtrig_audio coretemp intel_rapl_common iwlmvm intel_tcc_cooling x86_pkg_temp_thermal mt7921e intel_powerclamp 
mt7921_common mt792x_lib mt76_connac_lib kvm_intel snd_hda_intel mt76 snd_intel_dspcfg snd_hda_codec snd_hda_core mac80211 kvm snd_hwdep iwlwifi snd_seq 
irqbypass snd_seq_device pcspkr cfg80211 snd_pcm intel_wmi_thunderbolt i2c_i801 i2c_smbus snd_timer bfq tpm_crb snd soundcore mei_hdcp mei_pxp tpm_tis 
tpm_tis_core intel_pch_thermal tpm acpi_pad nfsd auth_rpcgss nfs_acl lockd grace sch_fq_codel sunrpc fuse zram raid1 dm_raid raid456 libcrc32c async_raid6_recov 
async_memcpy async_pq async_xor xor async_tx raid6_pq i915 igb i2c_algo_bit drm_buddy intel_gtt drm_display_helper
[76171.488690]  drm_kms_helper cec rc_core ttm drm agpgart ixgbe mdio dca xhci_pci hwmon mei_wdt xhci_pci_renesas i2c_core video wmi [last unloaded: nfnetlink]
[76171.488701] CPU: 2 PID: 30169 Comm: kworker/2:2 Not tainted 6.6.0-rc5+ #13
[76171.488704] Hardware name: Default string Default string/SKYBAY, BIOS 5.12 02/21/2023
[76171.488705] Workqueue: events swiotlb_dyn_alloc
[76171.488708] RIP: 0010:__alloc_pages+0x19c/0x200
[76171.488711] Code: ff ff 00 0f 84 56 ff ff ff 80 ce 01 e9 4e ff ff ff 83 fe 0a 0f 86 db fe ff ff 80 3d ba c9 4a 01 00 75 09 c6 05 b1 c9 4a 01 01 <0f> 0b 45 31 
e4 e9 4f ff ff ff a9 00 00 08 00 75 43 89 d9 80 e1 7f
[76171.488713] RSP: 0018:ffffc9000babfd78 EFLAGS: 00010246
[76171.488714] RAX: 0000000000000000 RBX: 0000000000000cc4 RCX: 0000000000000000
[76171.488716] RDX: 0000000000000000 RSI: 000000000000000e RDI: 0000000000000cc4
[76171.488717] RBP: 000000000000000e R08: 0000000000000000 R09: 0000000000000000
[76171.488718] R10: ffff88811ff99000 R11: 0000000000000000 R12: ffff888110070400
[76171.488719] R13: 0000000000000000 R14: 0000000003ffffff R15: ffff8881100586b0
[76171.488720] FS:  0000000000000000(0000) GS:ffff88845dc80000(0000) knlGS:0000000000000000
[76171.488722] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[76171.488723] CR2: 0000000003519000 CR3: 0000000002634004 CR4: 00000000003706e0
[76171.488725] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[76171.488726] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[76171.488727] Call Trace:
[76171.488729]  <TASK>
[76171.488730]  ? __alloc_pages+0x19c/0x200
[76171.488732]  ? __warn+0x78/0x130
[76171.488736]  ? __alloc_pages+0x19c/0x200
[76171.488738]  ? report_bug+0x169/0x1a0
[76171.488742]  ? handle_bug+0x41/0x70
[76171.488744]  ? exc_invalid_op+0x13/0x60
[76171.488747]  ? asm_exc_invalid_op+0x16/0x20
[76171.488751]  ? __alloc_pages+0x19c/0x200
[76171.488753]  swiotlb_alloc_pool+0x102/0x280
[76171.488756]  swiotlb_dyn_alloc+0x2a/0xa0
[76171.488757]  process_one_work+0x15d/0x330
[76171.488759]  worker_thread+0x2e8/0x400
[76171.488762]  ? drain_workqueue+0x120/0x120
[76171.488763]  kthread+0xdc/0x110
[76171.488766]  ? kthread_complete_and_exit+0x20/0x20
[76171.488769]  ret_from_fork+0x28/0x40
[76171.488771]  ? kthread_complete_and_exit+0x20/0x20
[76171.488774]  ret_from_fork_asm+0x11/0x20
[76171.488778]  </TASK>
[76171.488778] ---[ end trace 0000000000000000 ]---

Thanks,
Ben

-- 
Ben Greear <greearb@...delatech.com>
Candela Technologies Inc  http://www.candelatech.com