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

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Date: Mon, 23 Oct 2023 18:01:46 -0700
From: Florian Fainelli <f.fainelli@...il.com>
To: Ben Greear <greearb@...delatech.com>, netdev <netdev@...r.kernel.org>,
 Christoph Hellwig <hch@....de>, Petr Tesarik <petr@...arici.cz>
Subject: Re: swiotlb dyn alloc WARNING splat in wireless-next.

+Christoph, Petr

On 10/22/2023 11:48 AM, Ben Greear wrote:
> 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
> 

-- 
Florian