Re: kernel oops with blcr-0.7.3

From: Paul H. Hargrove (PHHargrove_at_lbl_dot_gov)
Date: Tue Nov 25 2008 - 13:21:17 PST

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    I have created a bugzilla entry for this issue at  
    http://upc-bugs.lbl.gov/bugzilla/show_bug.cgi?id=2454
    
    I believe I have fixed this bug for the upcoming 0.8.0 beta release, but 
    can't be 100% certain my test case fully duplicates the circumstances of 
    the reported failure.  So, I have also attached to the bugzilla entry a 
    patch relative to the 0.7.3 sources.  I'd appreciate it if Dominique (or 
    anyone else who has seen this problem) could report success of failure 
    when using the patch.
    
    -Paul
    
    Paul H. Hargrove wrote:
    > Dominique,
    >  I am now testing for a Beta release of 0.8.0 and I have been able to 
    > reproduce your Oops with the kernel version you indicated, and also 
    > with a vanilla 2.6.26 from kernel.org.  The bug relates to the restore 
    > of the FPU state, and since none of our test suite perform any 
    > floating point math, the bug went unnoticed in our testing of 0.7.3 
    > against the 2.6.26 kernel.
    >
    >  I have a possible fix in testing right now, and it is one of the 
    > things on my list to finish before the 0.8.0 beta release.
    >
    > -Paul
    >
    > Paul H. Hargrove wrote:
    >> Dominique,
    >>
    >>  I must say that we have not seen an error like this before.  
    >> However, we've not done testing ourselves on a kernel more recent 
    >> than a vanilla 2.6.26.  It seems likely that BLCR is not prepared for 
    >> something in the 2.6.26.6-49.fc8 kernel.
    >>  I hope to begin beta testing on BLCR 0.8.0 in late November, and we 
    >> are busy with other tasks between now and then.  So, I am afraid 
    >> there is little chance that your problem will be resolved prior to that.
    >>  However, I will try to see that we include a kernel like your inour 
    >> testing of 0.8.0 to ensure we identify the cause of the problem and 
    >> get it solved as quickly as we can.
    >>
    >> -Paul
    >>
    >>
    >> Dominique DELANDE wrote:
    >>>         Dear Sir or Madam,
    >>>
    >>> I am using blcr-0.7.3 to checkpoint MPI jobs, compiled either
    >>> with MVAPICH2-1.2rc2 or OpenMPI-1.3b1. In both cases,
    >>> checkpointing is apparently working, but restart ends
    >>> with a kernel oops on each node running a MPI process (see below).
    >>> The kernel oops is similar when using OpenMPI or MVAPICH2, I thus 
    >>> suspect that the problem comes from blcr.
    >>> I am running Linux Fedora 8 with a 2.6.26 Fedora x86_64 kernel.
    >>> Each node has two Dual Core AMD Opteron Processors 285 with 8 GBytes
    >>> of memory, Infiniband DDR, and the OFED-1.4-rc3 stack.
    >>>
    >>> Any help will be appreciated.
    >>>
    >>> Best regards
    >>>
    >>> Dominique Delande
    >>>
    >>> *******************************
    >>>
    >>> Ouput of 'uname -a':
    >>> Linux node11.cluster.local 2.6.26.6-49.fc8 #1 SMP Fri Oct 17 
    >>> 15:33:32 EDT 2008 x86_64 x86_64 x86_64 GNU/Linux
    >>>
    >>> Example:
    >>>
    >>> $ cr_restart context.20722
    >>>  node11 kernel: Oops: 0002 [1] SMP
    >>>  node11 kernel: Code: 48 8b 11 31 c0 c3 48 83 e9 07 eb 00 31 d2 48 
    >>> c7 c0 f2 ff ff ff c3 90 90 90 90 90 90 90 90 90 90 48 89 f8 89 d1 c1 
    >>> e9 03 83 e2 07 <f3> 48 a5 89 d1 f3 a4 c3 66 66 66 66 2e 0f 1f 84 00 
    >>> 00 00 00 00
    >>>  node11 kernel: CR2: 0000000000000000
    >>>
    >>> dmesg output is:
    >>>
    >>> BUG: unable to handle kernel NULL pointer dereference at 
    >>> 0000000000000000
    >>> IP: [<ffffffff81140d1b>] memcpy_c+0xb/0x20
    >>> PGD 22e4ed067 PUD 22dccf067 PMD 0
    >>> Oops: 0002 [1] SMP
    >>> CPU 1
    >>> Modules linked in: blcr(U) blcr_vmadump(U) blcr_imports(U) nfs lockd 
    >>> nfs_acl sunrpc rdma_ucm(U) ib_sdp(U) rdma_cm(U) iw_cm(U) ib_addr(U) 
    >>> ib_ipoib(U) ib_cm(U) ib_sa(U) ipv6 ib_uverbs(U) ib_umad(U) 
    >>> mlx4_ib(U) mlx4_core(U) dm_mirror dm_log dm_multipath dm_mod 
    >>> cfi_cmdset_0002 cfi_util tg3 jedec_probe cfi_probe ib_mthca(U) 
    >>> gen_probe ib_mad(U) ck804xrom ib_core(U) mtd k8temp i2c_nforce2 
    >>> i2c_core pcspkr chipreg hwmon shpchp map_funcs sr_mod cdrom sg 
    >>> pata_amd ata_generic pata_acpi sata_nv libata sd_mod scsi_mod ext3 
    >>> jbd mbcache uhci_hcd ohci_hcd ehci_hcd [last unloaded: scsi_wait_scan]
    >>> Pid: 20789, comm: cr_restart Not tainted 2.6.26.6-49.fc8 #1
    >>> RIP: 0010:[<ffffffff81140d1b>]  [<ffffffff81140d1b>] memcpy_c+0xb/0x20
    >>> RSP: 0018:ffff81022e4c7770  EFLAGS: 00010246
    >>> RAX: 0000000000000000 RBX: 0000000000000200 RCX: 0000000000000040
    >>> RDX: 0000000000000000 RSI: ffff81022e4c7788 RDI: 0000000000000000
    >>> RBP: ffff81022e4c7b58 R08: 0000000000000000 R09: 0000000000000001
    >>> R10: 0000000000000000 R11: 0000000000000001 R12: ffff81022e4c7788
    >>> R13: ffff810128c2a240 R14: 0000000000000000 R15: ffffffffffffffff
    >>> FS:  00007f4cabcdc6f0(0000) GS:ffff81022fa25300(0000) 
    >>> knlGS:0000000055788b90
    >>> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
    >>> CR2: 0000000000000000 CR3: 000000012e96b000 CR4: 00000000000006e0
    >>> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
    >>> DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
    >>> Process cr_restart (pid: 20789, threadinfo ffff81022e4c6000, task 
    >>> ffff81022e4596a0)
    >>> Stack:  ffffffffa0334524 0000000000000000 0000000000000000 
    >>> 000000000000037f
    >>>  0000000000000000 0000000000000000 0000ffff00009fc0 0000000000000000
    >>>  0000000000000000 0000000000000000 0000000000000000 0000000000000000
    >>> Call Trace:
    >>>  [<ffffffffa0334524>] ? :blcr_vmadump:vmadump_restore_cpu+0x197/0x5b4
    >>>  [<ffffffff810aa7a0>] ? do_sync_read+0xe2/0x126
    >>>  [<ffffffff810492dc>] ? autoremove_wake_function+0x0/0x38
    >>>  [<ffffffff8100c12a>] ? system_call_after_swapgs+0x8a/0x8f
    >>>  [<ffffffffa0332048>] ? :blcr_vmadump:read_user+0x48/0x72
    >>>  [<ffffffffa0333846>] :blcr_vmadump:vmadump_thaw_proc+0x169/0xb6b
    >>>  [<ffffffff8102fb8d>] ? hrtick_set+0xe0/0xe9
    >>>  [<ffffffff8129748d>] ? thread_return+0x7e/0xab
    >>>  [<ffffffffa03455dc>] :blcr:cr_thaw_threads+0x18d/0x1f1
    >>>  [<ffffffff810492dc>] ? autoremove_wake_function+0x0/0x38
    >>>  [<ffffffffa0343413>] :blcr:cr_rstrt_child+0xa1e/0x1ca2
    >>>  [<ffffffffa033e0b8>] ? :blcr:ctrl_ioctl+0x0/0x1bc
    >>>  [<ffffffffa033e22f>] :blcr:ctrl_ioctl+0x177/0x1bc
    >>>  [<ffffffff810e8aae>] proc_reg_unlocked_ioctl+0xa6/0xc6
    >>>  [<ffffffff810b6aaa>] vfs_ioctl+0x2a/0x77
    >>>  [<ffffffff810b6d45>] do_vfs_ioctl+0x24e/0x26b
    >>>  [<ffffffff8100a92a>] ? __switch_to+0xd8/0x376
    >>>  [<ffffffff810b6db9>] sys_ioctl+0x57/0x7a
    >>>  [<ffffffff8100c12a>] system_call_after_swapgs+0x8a/0x8f
    >>>
    >>>
    >>> Code: 48 8b 11 31 c0 c3 48 83 e9 07 eb 00 31 d2 48 c7 c0 f2 ff ff ff 
    >>> c3 90 90 90 90 90 90 90 90 90 90 48 89 f8 89 d1 c1 e9 03 83 e2 07 
    >>> <f3> 48 a5 89 d1 f3 a4 c3 66 66 66 66 2e 0f 1f 84 00 00 00 00 00
    >>> RIP  [<ffffffff81140d1b>] memcpy_c+0xb/0x20
    >>>  RSP <ffff81022e4c7770>
    >>> CR2: 0000000000000000
    >>> ---[ end trace 6c22587b3026d5be ]---
    >>> blcr: rstrt_watchdog: 'cr_restart' (tgid/pid 20788/20789) exited 
    >>> with signal 9 during restart
    >>>
    >>>
    >>
    >>
    >
    >
    
    
    -- 
    Paul H. Hargrove                          PHHargrove_at_lbl_dot_gov
    Future Technologies Group                 Tel: +1-510-495-2352
    HPC Research Department                   Fax: +1-510-486-6900
    Lawrence Berkeley National Laboratory     
    

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