Date:	Thu, 25 Jun 2009 12:29:15 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	netdev@...r.kernel.org
Cc:	bugzilla-daemon@...zilla.kernel.org,
	bugme-daemon@...zilla.kernel.org, amit@...xen.com,
	Dhananjay Phadke <dhananjay@...xen.com>
Subject: Re: [Bugme-new] [Bug 13617] New: GRO:__napi_complete from
 net_rx_action crash



(switched to email.  Please respond via emailed reply-to-all, not via the
bugzilla web interface).


netdev core crashed.  The netxen driver may be implicated.


Why did amit@...xen.com create this bug report?  Isn't Dhananjay
sitting in the next cube?  Perhaps you believe that the driver is OK
and that the bug lies in the netdev core?



On Thu, 25 Jun 2009 06:55:14 GMT
bugzilla-daemon@...zilla.kernel.org wrote:

> http://bugzilla.kernel.org/show_bug.cgi?id=13617
> 
>            Summary: GRO:__napi_complete from net_rx_action crash
>            Product: Drivers
>            Version: 2.5
>           Platform: All
>         OS/Version: Linux
>               Tree: Mainline
>             Status: NEW
>           Severity: normal
>           Priority: P1
>          Component: Network
>         AssignedTo: drivers_network@...nel-bugs.osdl.org
>         ReportedBy: amit@...xen.com
>         Regression: No
> 
> 
> In net_rx_action, there is check if napi_disable_pending then call
> __napi_complete.
> In __napi_complete, there is BUG_ON(n->gro_list);
> Which has hit in below bug dump.
> Why __napi_complete is called from net_rx_action instead of napi_complete.
> napi_complete flushes the gro list.
> 
> Below code excerpt from net_rx_action 
> http://lxr.linux.no/linux+v2.6.30/net/core/dev.c#L2736
> 
>    if (unlikely(work == weight)) {
> 2791       if (unlikely(napi_disable_pending(n)))
> 2792              __napi_complete(n);
> 2793        else
> 2794              list_move_tail(&n->poll_list, list);
> 2795   }
> 
> ------------[ cut here ]------------
> kernel BUG at net/core/dev.c:2672!
> invalid opcode: 0000 [#1] SMP 
> last sysfs file: /sys/devices/system/cpu/cpu3/cache/index2/shared_cpu_map
> CPU 2 
> Modules linked in: netxen_nic nfs lockd nfs_acl auth_rpcgss ipv6 deflate
> zlib_deflate ctr twofish twofish_common serpent blowfish des_generic cbc
> aes_x86_64 aes_generic xcbc sha256_generic md5 crypto_null af_key autofs4
> sunrpc iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi dm_mirror
> dm_region_hash dm_log dm_multipath dm_mod video output sbs sbshc pci_slot
> battery acpi_memhotplug ac parport ipmi_devintf ide_cd_mod rtc_cmos bnx2 cdrom
> serio_raw ipmi_si rtc_core button ipmi_msghandler iTCO_wdt rtc_lib shpchp hpilo
> hpwdt i5000_edac pcspkr edac_core ata_piix libata sd_mod scsi_mod cciss ext3
> jbd uhci_hcd ohci_hcd ehci_hcd [last unloaded: microcode]
> Pid: 0, comm: swapper Tainted: G        W  2.6.30 #1 ProLiant DL380 G5
> RIP: 0010:[<ffffffff8043b128>]  [<ffffffff8043b128>] __napi_complete+0x15/0x25
> RSP: 0018:ffff880028139eb0  EFLAGS: 00010086
> RAX: ffff88023d4056b8 RBX: ffff88023d4056a8 RCX: 0000000002202318
> RDX: 00000000001b0000 RSI: ffff880028139d98 RDI: ffff88023d4056a8
> RBP: 0000000000000080 R08: 0000000002200000 R09: 000006de15931680
> R10: ffffc20011a32318 R11: 0000000000000005 R12: 0000000000000000
> R13: ffff8800281440e0 R14: 0000000000000080 R15: 000000000000012c
> FS:  0000000000000000(0000) GS:ffff880028136000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0018 ES: 0018 CR0: 000000008005003b
> CR2: 00000000008cb530 CR3: 000000023d9ab000 CR4: 00000000000006e0
> Jun 23 23:41:27 DR0: 0000000000000000 DR1: 0000000000000000 DR2:
> 0000000000000000
> DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
> Process swapper (pid: 0, threadinfo ffff88023ed28000, task ffff88023ed27570)
> Stack:
>  ffff88023d4056a8 ffffffff8043ec9f 0000000000000001dut4146 last mes
> 000000010004f429
>  ffff88023d4056b8sage repeated 6  0000000000000046 0000000000000001
> 0000000000000100times
> Jun 23 23
>  ffffffff8069a098 0000000000000018 000000000000000a:41:32 dut4146 k
> ffffffff8023eba6
> ernel: BUG: scheCall Trace:
> duling while ato <IRQ> <0>mic: swapper/0/0 [<ffffffff8043ec9f>] ?
> net_rx_action+0xf0/0x162
>  [<ffffffff8023eba6>] ? __do_softirq+0xa3/0x163
>  [<ffffffff8020ca7c>] ? call_softirq+0x1c/0x28
> x10000100
> Jun 2 [<ffffffff8020dc1a>] ? do_softirq+0x2c/0x68
>  [<ffffffff8023eac6>] ? irq_exit+0x3f/0x7c
>  [<ffffffff8020d46b>] ? do_IRQ+0xa9/0xbf
> 3 23:41:32 dut41 [<ffffffff8020c353>] ? ret_from_intr+0x0/0xa
>  <EOI> 46 kernel: Modul<0> [<ffffffff80220e41>] ?
> hpet_legacy_next_event+0x0/0x7
> es linked in: ne [<ffffffff80386e2c>] ? acpi_hw_register_read+0x52/0xe5
>  [<ffffffff80394b2a>] ? acpi_idle_enter_simple+0x120/0x14e
>  [<ffffffff80394b20>] ? acpi_idle_enter_simple+0x116/0x14e
>  [<ffffffff8039486b>] ? acpi_idle_enter_bm+0xd5/0x274
>  [<ffffffff8041c020>] ? cpuidle_idle_call+0x7f/0xbb
>  [<ffffffff8020aaa5>] ? cpu_idle+0x4a/0x6d
> Code: txen_nic nfs loc48 8d kd nfs_acl auth_43 70 48 rpcgss ipv6 defl39 c2 ate
> zlib_deflate0f  ctr twofish two18 0e 75 fish_common serpdf ent blowfish des31
> c9 41 _generic cbc aes58 5b _x86_64 aes_gene5d 48 89 ric xcbc sha256_c8 c3
> generic md5 cryp53 f6 to_null af_key a47 10 01 utofs4 sunrpc is48 89 fb csi_tcp
> libiscsi75 04 _tcp libiscsi sc0f 0b eb si_transport_iscfe 48 83 si dm_mirror
> dm_7f 50 region_hash dm_l00 74 04 og dm_multipath <0f> dm_mod video out0b eb
> put sbs sbshc pcfe e8 i_slot battery a1f cpi_memhotplug a10 f1 ff c parport
> ipmi_df0 80 evintf ide_cd_mo63 10 fe d rtc_cmos bnx2 5b c3 cdrom serio_raw 53
> 48 89 ipmi_si rtc_corefb e8 
>  button ipmi_msgRIP  [<ffffffff8043b128>] __napi_complete+0x15/0x25
>  RSP <ffff880028139eb0>
> ---[ end trace 9c6b22b26aefd1b1 ]---
> handler iTCO_wdtKernel panic - not syncing: Fatal exception in interrupt
> Pid: 0, comm: swapper Tainted: G      D W  2.6.30 #1
> Call Trace:
>  <IRQ>  [<ffffffff8023a3b5>] ? panic+0x86/0x134
>  [<ffffffff8020e348>] ? show_registers+0x211/0x21d
>  [<ffffffff8024f5ea>] ? up+0xe/0x36
>  [<ffffffff8023a9db>] ? release_console_sem+0x174/0x18e
>  [<ffffffff804bdd54>] ? oops_end+0xa0/0xad
>  [<ffffffff8020cf2c>] ? do_invalid_op+0x85/0x8f
>  [<ffffffff8043b128>] ? __napi_complete+0x15/0x25
>  [<ffffffffa03ebfe2>] ? netxen_nic_hw_write_wx_2M+0x24/0xa8 [netxen_nic]
>  [<ffffffffa03ef866>] ? netxen_process_rcv_ring+0x4eb/0x501 [netxen_nic]
>  rtc_lib shpchp  [<ffffffff8020c715>] ? invalid_op+0x15/0x20
>  [<ffffffff8043b128>] ? __napi_complete+0x15/0x25
>  [<ffffffff8043ec9f>] ? net_rx_action+0xf0/0x162
>  [<ffffffff8023eba6>] ? __do_softirq+0xa3/0x163
>  [<ffffffff8020ca7c>] ? call_softirq+0x1c/0x28
>  [<ffffffff8020dc1a>] ? do_softirq+0x2c/0x68
>  [<ffffffff8023eac6>] ? irq_exit+0x3f/0x7c
>  [<ffffffff8020d46b>] ? do_IRQ+0xa9/0xbf
>  [<ffffffff8020c353>] ? ret_from_intr+0x0/0xa
>  <EOI>  [<ffffffff80220e41>] ? hpet_legacy_next_event+0x0/0x7
>  [<ffffffff80386e2c>] ? acpi_hw_register_read+0x52/0xe5
>  [<ffffffff80394b2a>] ? acpi_idle_enter_simple+0x120/0x14e
>  [<ffffffff80394b20>] ? acpi_idle_enter_simple+0x116/0x14e
>  [<ffffffff8039486b>] ? acpi_idle_enter_bm+0xd5/0x274
>  [<ffffffff8041c020>] ? cpuidle_idle_call+0x7f/0xbb
>  [<ffffffff8020aaa5>] ? cpu_idle+0x4a/0x6d
> 
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