Re: [Bug 41212] New: [regression] [3.1-git] ipoib causes kernel panic (NULL pointer dereference)

Bernd Schubert
2011-08-18T11:44:06Z

Hello Erez,

maybe it is another bug? Do you have the stack trace?
Any I guess you are the networking expert ;) I only looked at the
3.1-ipoib issue, as it prevented me too boot at all and I couldn't do my
real work...

Cheers,
Bernd

On 08/17/2011 11:06 AM, Erez Shitrit wrote:
> Hi Bernd,
> you are right, but it still happened. (also no changes in IPoIB between
> the tags, it might connected to the networking? )
>
> Thanks, Erez
>
> On Tue, Aug 16, 2011 at 1:34 PM, Bernd Schubert
> <bernd.schubert-97jfqw80gc6171pxa8y+qA@public.gmane.org <mailto:bernd.schubert-97jfqw80gc6171pxa8y+qA@public.gmane.org>> wrote:
>
> Hello Erez,
>
> are you sure? Commit 69cce1d1404968f78b177a0314f582 2d5afdbbfb is
> not in 3.0 yet and I also don't see how 3.0 should fail there, as it
> tests immediately for "if (likely(skb_dst(skb)"
>
>
> Thanks,
> Bernd
>
>
> On 08/16/2011 10:06 AM, Erez Shitrit wrote:
>
> Hi,
> it happened in 3.0 also, if you take the git tag v3.0-rc7 and
> below it
> will work.
>
> Thanks, Erez
>
> On Mon, Aug 15, 2011 at 6:40 PM, <bugzilla-daemon@bugzilla.
> kernel.org <mailto:bugzilla-daemon-590EEB7GvNiWaY/ihj7yzEB+6BGkLq7r@public.gmane.org>
> <mailto:bugzilla-daemon@ bugzilla.kernel.org
> <mailto:bugzilla-daemon-590EEB7GvNiWaY/ihj7yzEB+6BGkLq7r@public.gmane.org>>> wrote:
>
> https://bugzilla.kernel.org/ show_bug.cgi?id=41212
> <https://bugzilla.kernel.org/show_bug.cgi?id=41212>
>
> Summary: [regression] [3.1-git] ipoib causes
> kernel panic
> (NULL
> pointer dereference)
> Product: Networking
> Version: 2.5
> Kernel Version: 3.1-git
> Platform: All
> OS/Version: Linux
> Tree: Mainline
> Status: NEW
> Severity: normal
> Priority: P1
> Component: Other
> AssignedTo: acme-f8uhVLnGfZaxAyOMLChx1axOck334EZe@public.gmane.org
> <mailto:acme-f8uhVLnGfZaxAyOMLChx1axOck334EZe@public.gmane.org>
> <mailto:acme@ghostprotocols. net <mailto:acme-f8uhVLnGfZaxAyOMLChx1axOck334EZe@public.gmane.org>>
>
> ReportedBy: bernd.schubert-97jfqw80gc6171pxa8y+qA@public.gmane.org
> <mailto:bernd.schubert-97jfqw80gc6171pxa8y+qA@public.gmane.org>
> <mailto:bernd.schubert@ fastmail.fm
> <mailto:bernd.schubert-97jfqw80gc6171pxa8y+qA@public.gmane.org>>
>
> CC: linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
> <mailto:linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>
> <mailto:linux-rdma@vger. kernel.org
> <mailto:linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>>
>
> Regression: Yes
>
>
> Each time when I start IPoIB with any 3.1-rcX git version I
> tested
> so far I get
> a kernel panic. This didn't happen in 3.0 yet.
>
>
> fslab2 login: [ 114.392408] EXT4-fs (sdc): barriers disabled
> [ 114.449737] EXT4-fs (sdc): mounted filesystem with
> writeback data
> mode.
> Opts: journal_async_commit,barrier= 0,data=writeback
> [ 240.944030] BUG: unable to handle kernel NULL pointer
> dereference at
> 0000000000000040
> [ 240.948007] IP: [<ffffffffa0366ce9>]
> ipoib_start_xmit+0x39/0x280
> [ib_ipoib]
> [ 240.948007] PGD 1f964f067 PUD 1f9bf2067 PMD 0
> [ 240.948007] Oops: 0000 [#1] SMP
> [ 240.948007] CPU 1
> [ 240.948007] Modules linked in: ext4 mbcache jbd2 crc16 nfsd
> ib_umad rdma_ucm
> rdma_cm iw_cm ib_addr ib_uverbs ib_ipoib sg ib_cm ib_sa ipv6
> sd_mod
> crc_t10dif
> loop arcmsr md_mod pcspkr ib_mthca ib_mad ib_core 8250_pnp fuse
> af_packet nfs
> lockd fscache auth_rpcgss nfs_acl sunrpc btrfs lzo_decompress
> lzo_compress
> zlib_deflate crc32c libcrc32c crypto_hash crypto_algapi
> ata_generic
> pata_acpi
> e1000 pata_amd sata_nv libata scsi_mod unix [last unloaded:
> scsi_wait_scan]
> [ 240.948007]
> [ 240.948007] Pid: 0, comm: kworker/0:0 Not tainted
> 3.1.0-rc2+ #29
> Supermicro
> H8DCE/H8DCE
> [ 240.948007] RIP: 0010:[<ffffffffa0366ce9>]
> [<ffffffffa0366ce9>]
> ipoib_start_xmit+0x39/0x280 [ib_ipoib]
> [ 240.948007] RSP: 0018:ffff8801ffc03c10 EFLAGS: 00010246
> [ 240.948007] RAX: 0000000000000000 RBX: ffff8801f99ea000 RCX:
> 0000000000004420
> [ 240.948007] RDX: 0000000000000000 RSI: ffff8801f99ea000 RDI:
> ffff8801f9afd500
> [ 240.948007] RBP: ffff8801ffc03c40 R08: ffff8801f940d49c R09:
> ffff8801f9852240
> [ 240.948007] R10: 0000000000000000 R11: 0000000000000020 R12:
> ffff8801f9afd500
> [ 240.948007] R13: 0000000000000050 R14: ffff8801f99ea600 R15:
> ffff8801f9852280
> [ 240.948007] FS: 00007f0b66016700(0000)
> GS:ffff8801ffc00000(0000)
> knlGS:0000000000000000
> [ 240.948007] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
> [ 240.948007] CR2: 0000000000000040 CR3: 00000001f9a65000 CR4:
> 00000000000006e0
> [ 240.948007] DR0: 0000000000000000 DR1: 0000000000000000 DR2:
> 0000000000000000
> [ 240.948007] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7:
> 0000000000000400
> [ 240.948007] Process kworker/0:0 (pid: 0, threadinfo
> ffff8800bfe82000, task
> ffff8800bfe6f1a0)
> [ 240.948007] Stack:
> [ 240.948007] 0000000000000010 ffff8801f9afd500
> 0000000000004420
> 0000000000000050
> [ 240.948007] ffff8801f99ea000 ffff8801f9852280
> ffff8801ffc03ca0
> ffffffff812cd5e0
> [ 240.948007] 0000000000000001 ffffffffa03721a0
> ffffffff8131f680
> ffff8801fa110540
> [ 240.948007] Call Trace:
> [ 240.948007] <IRQ>
> [ 240.948007] [<ffffffff812cd5e0>]
> dev_hard_start_xmit+0x2a0/ 0x590
> [ 240.948007] [<ffffffff8131f680>] ? arp_create+0x70/0x200
> [ 240.948007] [<ffffffff812e8e1f>] sch_direct_xmit+0xef/0x1c0
> [ 240.948007] [<ffffffff812cd9f9>] dev_queue_xmit+0x129/0x3b0
> [ 240.948007] [<ffffffff8131f853>] arp_send+0x43/0x50
> [ 240.948007] [<ffffffff8131f96b>] arp_solicit+0x10b/0x240
>
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