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Date:	Wed, 7 Oct 2015 10:46:21 -0700
From:	Vinson Lee <vlee@...pensource.com>
To:	Neil Horman <nhorman@...hat.com>
Cc:	"David S. Miller" <davem@...emloft.net>,
	Jiri Pirko <jiri@...nulli.us>,
	Pravin B Shelar <pshelar@...ira.com>,
	Nikolay Aleksandrov <nikolay@...ulusnetworks.com>,
	Sony Chacko <sony.chacko@...gic.com>,
	Dept-HSGLinuxNICDev@...gic.com, Netdev <netdev@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: netpoll_send_skb_on_dev warning with bnx2

On Wed, Oct 7, 2015 at 7:38 AM, Neil Horman <nhorman@...hat.com> wrote:
> On Tue, Oct 06, 2015 at 10:12:56PM -0700, Vinson Lee wrote:
>> On Fri, Oct 2, 2015 at 6:10 AM, Neil Horman <nhorman@...hat.com> wrote:
>> > On Thu, Oct 01, 2015 at 08:25:46PM -0700, Vinson Lee wrote:
>> >> Hi.
>> >>
>> >> I am seeing a netpoll_send_skb_on_dev warning with bnx2. It happens on
>> >> Linux 4.1 and I am able to reproduce the warning with Linux 4.3-rc3.
>> >>
>> >> ------------[ cut here ]------------
>> >> WARNING: CPU: 11 PID: 3110 at net/core/netpoll.c:368
>> >> netpoll_send_skb_on_dev+0x183/0x201()
>> >> netpoll_send_skb_on_dev(): eth0 enabled interrupts in poll
>> >> (bnx2_start_xmit+0x0/0x5d4 [bnx2])
>> >> Modules linked in: netconsole(+) configfs ipv6 ppdev parport_pc lp
>> >> parport tcp_diag inet_diag ipmi_devintf serio_raw iTCO_wdt
>> >> iTCO_vendor_support ipmi_si ipmi_msghandler hpilo hpwdt bnx2 coretemp
>> >> kvm_intel kvm crc32c_intel ghash_clmulni_intel microcode lpc_ich
>> >> mfd_core i7core_edac edac_core pcc_cpufreq acpi_cpufreq shpchp
>> >> sch_fq_codel hpsa radeon ttm drm_kms_helper drm fb_sys_fops sysimgblt
>> >> sysfillrect syscopyarea i2c_algo_bit i2c_core
>> >> CPU: 11 PID: 3110 Comm: modprobe Not tainted 4.3.0-rc3 #1
>> >>  0000000000000170 ffff88060be17a18 ffffffff812bc84c ffffffff818b1a78
>> >>  ffff88060be17a68 ffff88060be17a58 ffffffff81064712 000000000be17a68
>> >>  ffffffff814ec12e ffff88060bc10900 0000000000000000 ffff8800d941c000
>> >> Call Trace:
>> >>  [<ffffffff812bc84c>] dump_stack+0x48/0x5c
>> >>  [<ffffffff81064712>] warn_slowpath_common+0xa1/0xbb
>> >>  [<ffffffff814ec12e>] ? netpoll_send_skb_on_dev+0x183/0x201
>> >>  [<ffffffff810647cf>] warn_slowpath_fmt+0x46/0x48
>> >>  [<ffffffffa039a6b9>] ? bnx2_run_loopback+0x391/0x391 [bnx2]
>> >>  [<ffffffff814ec12e>] netpoll_send_skb_on_dev+0x183/0x201
>> >>  [<ffffffff814ec58b>] netpoll_send_udp+0x3df/0x3f1
>> >>  [<ffffffffa049324a>] write_msg+0xaf/0xe9 [netconsole]
>> >>  [<ffffffff810a6daa>] call_console_drivers.clone.2+0xd1/0xe9
>> >>  [<ffffffff810a70d0>] console_unlock+0x30e/0x3a5
>> >>  [<ffffffff810a757d>] register_console+0x2af/0x322
>> >>  [<ffffffffa04971b4>] init_netconsole+0x1b4/0x224 [netconsole]
>> >>  [<ffffffffa0497000>] ? 0xffffffffa0497000
>> >>  [<ffffffff810002bf>] do_one_initcall+0xf7/0x182
>> >>  [<ffffffff811764fe>] ? kmem_cache_alloc_trace+0xb6/0xf0
>> >>  [<ffffffff810cb8d8>] ? do_init_module+0x31/0x1e4
>> >>  [<ffffffff810cb910>] do_init_module+0x69/0x1e4
>> >>  [<ffffffff810ccedc>] load_module+0x1451/0x160b
>> >>  [<ffffffff810ca1a3>] ? mod_kobject_put+0x4d/0x4d
>> >>  [<ffffffff811606f3>] ? __vmalloc_node+0x3e/0x40
>> >>  [<ffffffff810cd2aa>] SyS_init_module+0x14f/0x155
>> >>  [<ffffffff815833d7>] entry_SYSCALL_64_fastpath+0x12/0x6a
>> >> ---[ end trace 878215466e581776 ]---
>> >>
>> >> Cheers,
>> >> Vinson
>> >
>> > Hmm, that would suggest that someone called local_irq_enable in either the xmit,
>> > poll_controller or napi poll paths (or one of its always-disable, bretheren),
>> > but I dont see where that might be happening.  Are you able to instrument the
>> > kernel (either by cloning that WARN_ON_ONCE call or via stap script), so we can
>> > further isolate which call path the problem is happening in?
>> >
>> > Neil
>> >
>>
>> I bisected the regression and it is introduced with this Linux 3.19-rc1 commit.
>>
>> e22b886a8a43b147e1994a9f970f678fc0df2033 is the first bad commit
>> commit e22b886a8a43b147e1994a9f970f678fc0df2033
>> Author: Peter Zijlstra <peterz@...radead.org>
>> Date:   Wed Sep 24 10:18:48 2014 +0200
>>
>>     sched/wait: Add might_sleep() checks
>>
>>     Add more might_sleep() checks, suppose someone put a wait_event() like
>>     thing in a wait loop..
>>
>>     Can't put might_sleep() in ___wait_event() because there's the locked
>>     primitives which call ___wait_event() with locks held.
>>
>>     Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
>>     Cc: tglx@...utronix.de
>>     Cc: ilya.dryomov@...tank.com
>>     Cc: umgwanakikbuti@...il.com
>>     Cc: Oleg Nesterov <oleg@...hat.com>
>>     Cc: Linus Torvalds <torvalds@...ux-foundation.org>
>>     Link: http://lkml.kernel.org/r/20140924082242.119255706@infradead.org
>>     Signed-off-by: Ingo Molnar <mingo@...nel.org>
>>
>> :040000 040000 1536c4cc3c706b4129452ce023c69733b46a23e4
>> 22c894c6ae02be75e5f772d39fde178f036e906f M    include
>>
>> Vinson
>
> That doesn't make any sense.  That commitis just adding some warning messages,
> it doesn't change any locking or irq enablement states.  That in turn suggests
> that you are seeing something is transient and sensitive to timing.  What driver
> is eth0 using?  Is it bnx2 or something else?
>
> Neil
>

eth0 is using bnx2.

$ ethtool -i eth0
driver: bnx2
version: 2.2.6
firmware-version: bc 5.2.3 NCSI 2.0.12
bus-info: 0000:03:00.0
supports-statistics: yes
supports-test: yes
supports-eeprom-access: yes
supports-register-dump: yes
supports-priv-flags: no

I can add some WARN_ON_ONCE calls elsewhere in the kernel. Do you have
suggestions where or can provide me an example patch?

Vinson
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