RE: [PATCH] ethernet/intel: release the local packet buffer

[Brown, Aaron F]

> From: netdev-owner@xxxxxxxxxxxxxxx [mailto:netdev-
> owner@xxxxxxxxxxxxxxx] On Behalf Of Navid Emamdoost
> Sent: Tuesday, September 17, 2019 5:00 PM
> Cc: emamd001@xxxxxxx; smccaman@xxxxxxx; kjlu@xxxxxxx; Navid
> Emamdoost <navid.emamdoost@xxxxxxxxx>; Kirsher, Jeffrey T
> <jeffrey.t.kirsher@xxxxxxxxx>; David S. Miller <davem@xxxxxxxxxxxxx>;
> intel-wired-lan@xxxxxxxxxxxxxxxx; netdev@xxxxxxxxxxxxxxx; linux-
> kernel@xxxxxxxxxxxxxxx
> Subject: [PATCH] ethernet/intel: release the local packet bufferq
> 
> In e100_loopback_test the buffer allocated for the local packet needs to
> be released.
> 
> Signed-off-by: Navid Emamdoost <navid.emamdoost@xxxxxxxxx>
> ---
>  drivers/net/ethernet/intel/e100.c | 1 +
>  1 file changed, 1 insertion(+)

Sorry for the delay getting to this, took me a bit to get the hardware together.

NAK, this patch introduces a trace to my test machines when I run the ethtool diagnostic on an e100 port, the system will sometimes survive a bit after the trace, however if I try to run traffic across the interface after the trace the system panics and locks up with a kernel not syncing message.  I do not have a capture of the lock up panic (I can probably get one via serial port or netconsole if really necessary.)  The trace before the lock up panic is as follows:
---------------------------------------------------------------------------
[  102.460446] BUG: Bad page state in process ethtool  pfn:78db8
[  102.460474] page:ffffd5bf41e36e00 refcount:-1 mapcount:0 mapping:0000000000000000 index:0x0
[  102.460505] flags: 0xfffffc0000000()
[  102.460523] raw: 000fffffc0000000 dead000000000100 dead000000000122 0000000000000000
[  102.460553] raw: 0000000000000000 0000000000000000 ffffffffffffffff 0000000000000000
[  102.460582] page dumped because: nonzero _refcount
[  102.460602] Modules linked in: snd_hda_codec_realtek snd_hda_codec_generic snd_hda_intel snd_intel_nhlt snd_hda_codec
 snd_hwdep snd_hda_core snd_seq snd_seq_device snd_pcm mei_wdt snd_timer iTCO_wdt mei_me snd iTCO_vendor_support gpio_ic
h mei coretemp lpc_ich pcspkr sg soundcore i2c_i801 joydev acpi_cpufreq nfsd auth_rpcgss nfs_acl lockd grace sunrpc ip_t
ables xfs libcrc32c sd_mod sr_mod cdrom i915 video i2c_algo_bit drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_
fops e1000e ata_generic firewire_ohci pata_marvell ata_piix drm pata_acpi serio_raw e100 firewire_core libata ptp pps_co
re mii crc_itu_t
[  102.460800] CPU: 3 PID: 1541 Comm: ethtool Not tainted 5.4.0-rc1_next-queue_dev-queue_regress-00576-g16390e0 #3
[  102.460836] Hardware name:  /DQ35JO, BIOS JOQ3510J.86A.0954.2008.0922.2331 09/22/2008
[  102.460865] Call Trace:
[  102.460883]  dump_stack+0x5a/0x73
[  102.460900]  bad_page+0xf5/0x10f
[  102.460916]  get_page_from_freelist+0x103e/0x1290
[  102.460936]  ? __switch_to_asm+0x40/0x70
[  102.460955]  ? __build_skb+0x20/0x190
[  102.460972]  __alloc_pages_nodemask+0x17d/0x320
[  102.460991]  page_frag_alloc+0x87/0x130
[  102.461008]  __netdev_alloc_skb+0x10b/0x130
[  102.461029]  e100_rx_alloc_skb+0x20/0x180 [e100]
[  102.461050]  e100_rx_alloc_list+0x98/0x160 [e100]
[  102.461070]  e100_up+0x11/0x120 [e100]
[  102.461088]  e100_diag_test+0x14e/0x157 [e100]
[  102.461107]  ? _cond_resched+0x15/0x30
[  102.461125]  ? dev_ethtool+0x1133/0x2c30
[  102.461143]  dev_ethtool+0x1159/0x2c30
[  102.461161]  ? inet_ioctl+0x1a0/0x1d0
[  102.461178]  ? netdev_run_todo+0x5d/0x2d0
[  102.461196]  dev_ioctl+0xb3/0x4e0
[  102.461212]  sock_do_ioctl+0xa0/0x140
[  102.461228]  ? do_anonymous_page+0x361/0x670
[  102.461247]  sock_ioctl+0x26e/0x380
[  102.461264]  do_vfs_ioctl+0xa9/0x630
[  102.461281]  ? handle_mm_fault+0xe2/0x1f0
[  102.462101]  ? __do_page_fault+0x247/0x490
[  102.462911]  ksys_ioctl+0x60/0x90
[  102.463715]  __x64_sys_ioctl+0x16/0x20
[  102.464519]  do_syscall_64+0x5b/0x1b0
[  102.465321]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[  102.466134] RIP: 0033:0x7f03e53f32f7
[  102.466948] Code: 44 00 00 48 8b 05 79 1b 2d 00 64 c7 00 26 00 00 00 48 c7 c0 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 b8 10 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 49 1b 2d 00 f7 d8 64 89 01 48
[  102.468728] RSP: 002b:00007ffffc72ebf8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[  102.469657] RAX: ffffffffffffffda RBX: 00007ffffc72ec50 RCX: 00007f03e53f32f7
[  102.470595] RDX: 00007ffffc72ec60 RSI: 0000000000008946 RDI: 0000000000000003
[  102.471532] RBP: 0000000000000001 R08: 0000000000000002 R09: 0000000000000038
[  102.472453] R10: 00007ffffc72e7c0 R11: 0000000000000246 R12: 0000000000000038
[  102.473359] R13: 0000000001428010 R14: 00000000014280d0 R15: 00007ffffc72edc8
[  102.474260] Disabling lock debugging due to kernel taint
[  104.924447] e100 0000:06:00.0 eth0: NIC Link is Up 100 Mbps Full Duplex
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