[ofa-general] OFED 1.3 rc2 kernel panic: trying to enable SA cache

[Arlin Davis]

- RHEL4u4, OFED 1.3 rc2, CA type: MT25208, FW 4.8.200, SDR, OpenSM

echo 0x7f > /sys/module/ib_sa/paths_per_dest

causes....

<5> Unable to handle kernel NULL pointer dereference at 0000000000000020 
RIP:
<5> <ffffffffa016ef0c>{:ib_mthca:mthca_ah_grh_present+0}
<5> PML4 1139ef067 PGD 10db04067 PMD 0
<5> Oops: 0000 [1] SMP
<5> CPU 1
<5> Modules linked in: netconsole nfs lockd nfs_acl autofs4 i2c_dev 
i2c_core sunrpc rdma_ucm(U) qlgc_vnic(U) ib_sdp(U) rdma_cm(U) iw_cm(U) 
ib_addr(U) ib_ipath(U) mlx4_ib(U) mlx4_core(U) ipt_REJECT ipt_state 
ip_conntrack iptable_filter ip_tables dm_mirror dm_mod button battery ac 
joydev uhci_hcd ehci_hcd hw_random ib_mthca(U) ib_ipoib(U) ib_umad(U) 
ib_ucm(U) ib_uverbs(U) ib_cm(U) ib_sa(U) ib_mad(U) ib_core(U) md5 ipv6 
e1000(U) ahci ext3 jbd ata_piix libata sd_mod scsi_mod
<5> Pid: 1581, comm: ib_inform Not tainted 2.6.9-42.ELsmp
<5> RIP: 0010:[<ffffffffa016ef0c>] 
<ffffffffa016ef0c>{:ib_mthca:mthca_ah_grh_present+0}
<5> RSP: 0018:0000010118ff5b70  EFLAGS: 00010046
<5> RAX: 0000000000000005 RBX: 0000010037ebdd90 RCX: 0000010119186d88
<5> RDX: 0000000000000001 RSI: 0000010037ebdc00 RDI: 0000000000000000
<5> RBP: 0000010037ebdc00 R08: 000001011780d080 R09: 000001011780d090
<5> R10: 0000010119186c00 R11: 0000000000000100 R12: 000001011780d080
<5> R13: 0000010119186d88 R14: 00000101198fc000 R15: 000001011780d090
<5> FS:  0000000000000000(0000) GS:ffffffff804e5100(0000) 
knlGS:0000000000000000
<5> CS:  0010 DS: 0018 ES: 0018 CR0: 000000008005003b
<5> CR2: 0000000000000020 CR3: 0000000005d68000 CR4: 00000000000006e0
<5> Process ib_inform (pid: 1581, threadinfo 0000010118ff4000, task 
0000010119965030)
<5> Stack: ffffffffa016cba7 0000000000000001 000001011780d090 
000001011780d000
<5>        00000101198fc000 0000010119186d88 0000010037ebdc00 
0000000000000001
<5>        ffffffffa016d470 0000000000000000
<5> Call Trace:<ffffffffa016cba7>{:ib_mthca:build_mlx_header+45} 
<ffffffffa016d470>{:ib_mthca:mthca_tavor_post_send+1481}
<5>        <ffffffffa01059bd>{:ib_mad:ib_send_mad+246} 
<ffffffffa0106198>{:ib_mad:ib_post_send_mad+1216}
<5>        <ffffffff801e85ff>{alloc_layer+67} <ffffffff801626b7>{kzalloc+9}
<5>        <ffffffffa0111726>{:ib_sa:send_mad+152} 
<ffffffffa0111ebb>{:ib_sa:ib_sa_informinfo_query+330}
<5>        <ffffffffa01138eb>{:ib_sa:inform_work_handler+0} 
<ffffffffa0113be1>{:ib_sa:inform_work_handler+758}
<5>        <ffffffffa0113e9c>{:ib_sa:reg_handler+0} 
<ffffffff80147852>{worker_thread+419}
<5>        <ffffffff80133da9>{default_wake_function+0} 
<ffffffff80133dfa>{__wake_up_common+67}
<5>        <ffffffff80133da9>{default_wake_function+0} 
<ffffffff8014b4f0>{keventd_create_kthread+0}
<5>        <ffffffff801476af>{worker_thread+0} 
<ffffffff8014b4f0>{keventd_create_kthread+0}
<5>        <ffffffff8014b4c7>{kthread+200} <ffffffff80110f47>{child_rip+8}
<5>        <ffffffff8014b4f0>{keventd_create_kthread+0} 
<ffffffff8014b3ff>{kthread+0}
<5>        <ffffffff80110f3f>{child_rip+0}
<5>
<5> Code: 48 8b 47 20 0f be 40 05 c1 e8 1f c3 41 54 b8 ea ff ff ff 49
<5> RIP <ffffffffa016ef0c>{:ib_mthca:mthca_ah_grh_present+0} RSP 
<0000010118ff5b70>
<5> CR2: 0000000000000020
<5>  <0>Kernel panic - not syncing: Oops