I haven't seen this stack trace before. Since it involves the RX
QP connection and my patch changes the TX QP connection,
I doubt my patch has any effect on this case. When I get some
time, I will look to see if I can find similar races in the RX connection
set up & tear down that might exist.
________________________________________
From: Pradeep Satyanarayana [prade...@linux.vnet.ibm.com]
Sent: Thursday, September 02, 2010 8:41 PM
To: Ralph Campbell
Cc: Roland Dreier; linux-rdma@vger.kernel.org
Subject: Re: [PATCH v5] IB/ipoib: fix dangling pointer references to
ipoib_neigh and ipoib_path
Ralph,
I see the following crash sporadically (only under stress) with a Sles11SP1
(which is 2.6.32 kernel).
I saw this crash with V4 of your patch and have not yet had a chance to try V5.
Have you seen this
in your testing? If this not the crash stack can you please share what your
patch fixes?
<4>ib0: RX drain timing out
<4>idr_remove called for id=11491974 which is not allocated.
<4>Call Trace:
<4>[c000000749fe33b0] [c0000000000129e4] .show_stack+0x6c/0x198 (unreliable)
<4>[c000000749fe3460] [c0000000002ea594] .sub_remove+0x1ec/0x1f8
<4>[c000000749fe3520] [c0000000002ea5e0] .idr_remove+0x40/0xf8
<4>[c000000749fe35b0] [d000000012d84d70] .cm_destroy_id+0xa0/0x520 [ib_cm]
<4>[c000000749fe3680] [d00000001b7fb644] .ipoib_cm_free_rx_reap_list+0xd4/0x190
[ib_ipoib]
<4>[c000000749fe3740] [d00000001b7fe404] .ipoib_cm_dev_stop+0x23c/0x360
[ib_ipoib]
<4>[c000000749fe3800] [d00000001b7f4dbc] .ipoib_ib_dev_stop+0xe4/0x4b0
[ib_ipoib]
<4>[c000000749fe3960] [d00000001b7f0f30] .ipoib_stop+0x88/0x178 [ib_ipoib]
<4>[c000000749fe39f0] [c0000000004eacf4] .dev_close+0xdc/0x148
<4>[c000000749fe3a80] [c0000000004ea2b8] .dev_change_flags+0x1f0/0x288
<4>[c000000749fe3b20] [d00000001b7f11b8] .ipoib_remove_one+0xb8/0x140 [ib_ipoib]
<4>[c000000749fe3bc0] [d00000001210425c] .ib_unregister_client+0xb4/0x1b8
[ib_core]
<4>[c000000749fe3c90] [d00000001b7ffde8] .ipoib_cleanup_module+0x20/0x60
[ib_ipoib]
<4>[c000000749fe3d20] [c0000000000ec408] .SyS_delete_module+0x238/0x320
<4>[c000000749fe3e30] [c0000000000085b4] syscall_exit+0x0/0x40
<1>Unable to handle kernel paging request for data at address 0x45000027228d1ffb
<1>Faulting instruction address: 0xc0000000005a8e88
12:mon> e
cpu 0x12: Vector: 300 (Data Access) at [c000000749fe3250]
pc: c0000000005a8e88: .wait_for_common+0xb8/0x268
lr: c0000000005a8e20: .wait_for_common+0x50/0x268
sp: c000000749fe34d0
msr: 8000000000009032
dar: 45000027228d1ffb
dsisr: 42000000
current = 0xc00000074b4ce0e0
paca = 0xc000000000f64a00
pid = 13605, comm = modprobe
12:mon>
Thanks
Pradeep
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