[openib-general] ib_umad crash

[Tom Duffy]

I had just unloaded and reloaded all the kernel modules, and restarted
opensm which printed:
Error from osm_opensm_bind (0x2A)

Then this:

[root at flopteron2 bin]# Unable to handle kernel paging request at 0000003164616d7d RIP:
<ffffffff801e99fc>{strnlen+12}
PML4 31b6c067 PGD 0
Oops: 0000 [1] SMP
CPU 2
Modules linked in: ib_umad ib_ipoib ib_sa ib_mthca ib_mad ib_core loop pciehp md5 ipv6 parport_pc lp parport autofs4 nfs lockd sunrpc pcmcia yenta_socket pcmcia_core ext3 jbd video button battery ac uhci_hcd ehci_hcd hw_random i2c_i801 i2c_core e1000 floppy dm_snapshot dm_zero dm_mirror xfs dm_mod mptscsih mptbase sd_mod scsi_mod
Pid: 16067, comm: udev Not tainted 2.6.10openib
RIP: 0010:[<ffffffff801e99fc>] <ffffffff801e99fc>{strnlen+12}
RSP: 0018:000001000a873d60  EFLAGS: 00010297
RAX: 0000003164616d7d RBX: 0000010007cec000 RCX: 000000000000000a
RDX: 000001000a873df8 RSI: fffffffffffffffe RDI: 0000003164616d7d
RBP: 0000000000000000 R08: 00000000ffffffff R09: 0000000000000000
R10: 0000000000000006 R11: 0000000000000000 R12: 0000010087cebffe
R13: 0000003164616d7d R14: 00000000ffffffff R15: 000001000a873dc8
FS:  0000002a9555ede0(0000) GS:ffffffff8044dd00(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
CR2: 0000003164616d7d CR3: 000000003ff10000 CR4: 00000000000006e0
Process udev (pid: 16067, threadinfo 000001000a872000, task 000001000d96b7e0)
Stack: ffffffff801ea375 000001000a873e88 ffffffff801d35ca 000000007fffffff
       0000010007cec000 ffffffffa01193bb 000001001b58f380 000001003c69e9b0
       000001001b58f3a0 000001000a873f50
Call Trace:<ffffffff801ea375>{vsnprintf+757} <ffffffff801d35ca>{avc_has_perm+90}
       <ffffffff801ea7e8>{sprintf+136} <ffffffff801d44b3>{inode_has_perm+131}
       <ffffffffa0118d10>{:ib_umad:show_ibdev+0} <ffffffffa0118d33>{:ib_umad:show_ibdev+35}
       <ffffffff80251f28>{class_device_attr_show+24} <ffffffff801b728c>{sysfs_read_file+172}
       <ffffffff80179634>{vfs_read+228} <ffffffff801798e3>{sys_read+83}
       <ffffffff8010e446>{system_call+126}

Code: 80 3f 00 90 74 11 48 ff ce 48 ff c0 48 83 fe ff 74 05 80 38
RIP <ffffffff801e99fc>{strnlen+12} RSP <000001000a873d60>
CR2: 0000003164616d7d
 <1>Unable to handle kernel paging request at 0000003164616d7d RIP:
<ffffffff801e99fc>{strnlen+12}
PML4 2d34a067 PGD 0
Oops: 0000 [2] SMP
CPU 3
Modules linked in: ib_umad ib_ipoib ib_sa ib_mthca ib_mad ib_core loop pciehp md5 ipv6 parport_pc lp parport autofs4 nfs lockd sunrpc pcmcia yenta_socket pcmcia_core ext3 jbd video button battery ac uhci_hcd ehci_hcd hw_random i2c_i801 i2c_core e1000 floppy dm_snapshot dm_zero dm_mirror xfs dm_mod mptscsih mptbase sd_mod scsi_mod
Pid: 16064, comm: udev Not tainted 2.6.10openib
RIP: 0010:[<ffffffff801e99fc>] <ffffffff801e99fc>{strnlen+12}
RSP: 0018:0000010035771d60  EFLAGS: 00010297
RAX: 0000003164616d7d RBX: 0000010023f6b000 RCX: 000000000000000a
RDX: 0000010035771df8 RSI: fffffffffffffffe RDI: 0000003164616d7d
RBP: 0000000000000000 R08: 00000000ffffffff R09: 0000000000000000
R10: 0000000000000006 R11: 0000000000000000 R12: 00000100a3f6affe
R13: 0000003164616d7d R14: 00000000ffffffff R15: 0000010035771dc8
FS:  0000002a9555ede0(0000) GS:ffffffff8044dd80(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
CR2: 0000003164616d7d CR3: 000000003ff46000 CR4: 00000000000006e0
Process udev (pid: 16064, threadinfo 0000010035770000, task 000001000225b090)
Stack: ffffffff801ea375 0000010035771e88 ffffffff801d35ca 000000007fffffff
       0000010023f6b000 ffffffffa01193bb 0000010017581600 000001003c69e9b0
       0000010017581620 0000010035771f50
Call Trace:<ffffffff801ea375>{vsnprintf+757} <ffffffff801d35ca>{avc_has_perm+90}
       <ffffffff801ea7e8>{sprintf+136} <ffffffff801d44b3>{inode_has_perm+131}
       <ffffffffa0118d10>{:ib_umad:show_ibdev+0} <ffffffffa0118d33>{:ib_umad:show_ibdev+35}
       <ffffffff80251f28>{class_device_attr_show+24} <ffffffff801b728c>{sysfs_read_file+172}
       <ffffffff80179634>{vfs_read+228} <ffffffff801798e3>{sys_read+83}
       <ffffffff8010e446>{system_call+126}

Code: 80 3f 00 90 74 11 48 ff ce 48 ff c0 48 83 fe ff 74 05 80 38
RIP <ffffffff801e99fc>{strnlen+12} RSP <0000010035771d60>
CR2: 0000003164616d7d

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