From mboxrd@z Thu Jan  1 00:00:00 1970
From: bugzilla-daemon-590EEB7GvNiWaY/ihj7yzEB+6BGkLq7r@public.gmane.org
Subject: [Bug 41212] New: [regression] [3.1-git] ipoib causes kernel panic
 (NULL pointer dereference)
Date: Mon, 15 Aug 2011 15:40:53 GMT
Message-ID: <bug-41212-11804@https.bugzilla.kernel.org/>
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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
        ReportedBy: bernd.schubert-97jfqw80gc6171pxa8y+qA@public.gmane.org
                CC: 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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