[LU-2728] Oops reading /proc/fs/lustre/fld/srv-lustre-OST0001/fldb

• Type: Bug
• Resolution: Fixed
• Priority: Blocker
• Fix Version/s: Lustre 2.4.0
• Affects Version/s: Lustre 2.4.0
• Labels: LB
• Severity: 3
• Assignee: John Hammond
• Reporter: John Hammond

Description

PID: 17854  TASK: ffff8801922e0040  CPU: 3   COMMAND: "cat"
 #0 [ffff880199bff9e0] machine_kexec at ffffffff8103284b
    /root/rpmbuild/BUILD/kernel-2.6.32-279.14.1.el6_lustre_gcov.x86_64/arch/x86/kernel/machine_kexec_64.c: 336
 #1 [ffff880199bffa40] crash_kexec at ffffffff810ba982
    /root/rpmbuild/BUILD/kernel-2.6.32-279.14.1.el6_lustre_gcov.x86_64/kernel/kexec.c: 1106
 #2 [ffff880199bffb10] oops_end at ffffffff81503430
    /root/rpmbuild/BUILD/kernel-2.6.32-279.14.1.el6_lustre_gcov.x86_64/arch/x86/kernel/dumpstack.c: 242
 #3 [ffff880199bffb40] no_context at ffffffff81043bfb
    /root/rpmbuild/BUILD/kernel-2.6.32-279.14.1.el6_lustre_gcov.x86_64/arch/x86/mm/fault.c: 698
 #4 [ffff880199bffb90] __bad_area_nosemaphore at ffffffff81043e85
    /root/rpmbuild/BUILD/kernel-2.6.32-279.14.1.el6_lustre_gcov.x86_64/arch/x86/mm/fault.c: 764
 #5 [ffff880199bffbe0] bad_area at ffffffff81043fae
    /root/rpmbuild/BUILD/kernel-2.6.32-279.14.1.el6_lustre_gcov.x86_64/arch/x86/mm/fault.c: 793
 #6 [ffff880199bffc10] __do_page_fault at ffffffff81044760
    /root/rpmbuild/BUILD/kernel-2.6.32-279.14.1.el6_lustre_gcov.x86_64/arch/x86/mm/fault.c: 1140
 #7 [ffff880199bffd30] do_page_fault at ffffffff8150540e
    /root/rpmbuild/BUILD/kernel-2.6.32-279.14.1.el6_lustre_gcov.x86_64/arch/x86/mm/fault.c: 1208
 #8 [ffff880199bffd60] page_fault at ffffffff815027c5
    /root/rpmbuild/BUILD/kernel-2.6.32-279.14.1.el6_lustre_gcov.x86_64/arch/x86_64/kernel/entry.S
    [exception RIP: fldb_seq_stop+13]
    RIP: ffffffffa043935d  RSP: ffff880199bffe18  RFLAGS: 00010246
    RAX: 0000000000000000  RBX: ffff88014d869940  RCX: 0000000000001000
    RDX: ffffffffa043e5e0  RSI: 0000000000000000  RDI: 0000000000000000
    RBP: ffff880199bffe18   R8: 00000000000000d0   R9: 0000000080042000
    R10: 0000000000000001  R11: 0000000000000000  R12: ffff8801811f4380
    R13: 0000000000000000  R14: ffff88019fd10440  R15: ffff880199bffe60
    ORIG_RAX: ffffffffffffffff  CS: 0010  SS: 0018
 #9 [ffff880199bffe20] seq_read at ffffffff8119f720
    /root/rpmbuild/BUILD/kernel-2.6.32-279.14.1.el6_lustre_gcov.x86_64/fs/seq_file.c: 222
#10 [ffff880199bffea0] proc_reg_read at ffffffff811e27fe
    /root/rpmbuild/BUILD/kernel-2.6.32-279.14.1.el6_lustre_gcov.x86_64/fs/proc/inode.c: 202
#11 [ffff880199bffef0] vfs_read at ffffffff8117d4e5
    /root/rpmbuild/BUILD/kernel-2.6.32-279.14.1.el6_lustre_gcov.x86_64/fs/read_write.c: 295
#12 [ffff880199bfff30] sys_read at ffffffff8117d621
    /root/rpmbuild/BUILD/kernel-2.6.32-279.14.1.el6_lustre_gcov.x86_64/fs/read_write.c: 369
#13 [ffff880199bfff80] system_call_fastpath at ffffffff8100b0f2
    /root/rpmbuild/BUILD/kernel-2.6.32-279.14.1.el6_lustre_gcov.x86_64/arch/x86/kernel/entry_64.S: 489
    RIP: 0000003282eda360  RSP: 00007fff0fdcc2b0  RFLAGS: 00010206
    RAX: 0000000000000000  RBX: ffffffff8100b0f2  RCX: 0000000001925030
    RDX: 0000000000008000  RSI: 000000000191d000  RDI: 0000000000000005
    RBP: 000000000191d000   R8: 000000328318dee8   R9: 0000000000000001
    R10: 0000000000008fff  R11: 0000000000000246  R12: ffffffffffff8000
    R13: 0000000000000005  R14: 0000000000008000  R15: 0000000000000005
    ORIG_RAX: 0000000000000000  CS: 0033  SS: 002b