The system with IBM ClearCase panics in acl_permission_check() / in_group_p() / groups_search() with [mvfs] kernel module

Solution Verified - Updated -

Issue

  • A machine running mvfs will sometimes panic with a stack similar to the following:
PID: 11866  TASK: ffff8801523faa80  CPU: 0   COMMAND: "cc1"
 #0 [ffff88026d94b670] machine_kexec at ffffffff8103214b
 #1 [ffff88026d94b6d0] crash_kexec at ffffffff810b91c2
 #2 [ffff88026d94b7a0] oops_end at ffffffff814f0b00
 #3 [ffff88026d94b7d0] die at ffffffff8100f26b
 #4 [ffff88026d94b800] do_general_protection at ffffffff814f0692
 #5 [ffff88026d94b830] general_protection at ffffffff814efe65
    [exception RIP: groups_search+72]
    RIP: ffffffff810995a8  RSP: ffff88026d94b8e8  RFLAGS: 00010202
    RAX: 324e5a5f00624574  RBX: ffff8800a56050c0  RCX: 00000000ffff8802
    RDX: 000000007fffc401  RSI: 0000000000000000  RDI: ffff8802b4a860c0
    RBP: ffff88026d94b8e8   R8: 0000000000000000   R9: 0000000000000001
    R10: 0000000000000001  R11: ffff88026d94bbd8  R12: 0000000000000001
    R13: 00000000000041ed  R14: ffff8801523faa80  R15: ffff88026d94b9a8
    ORIG_RAX: ffffffffffffffff  CS: 0010  SS: 0018
 #6 [ffff88026d94b8f0] in_group_p at ffffffff81099601
 #7 [ffff88026d94b900] acl_permission_check at ffffffff811826bd
 #8 [ffff88026d94b930] __link_path_walk at ffffffff81185079
 #9 [ffff88026d94b9f0] path_walk at ffffffff811861fa
 #10 [ffff88026d94ba30] vfs_path_lookup at ffffffff811862fe
 #11 [ffff88026d94ba60] mvop_linux_lookup_component at ffffffffa040dc36 [mvfs]
 #12 [ffff88026d94bad0] mvfs_lookup_ctx at ffffffffa03d3490 [mvfs]
 #13 [ffff88026d94bb60] mvfs_linux_lookup_wrapper at ffffffffa0408561 [mvfs]
 #14 [ffff88026d94bbc0] vnode_iop_lookup at ffffffffa040b7d2 [mvfs]
 #15 [ffff88026d94bc50] do_lookup at ffffffff81184dcc
 #16 [ffff88026d94bca0] __link_path_walk at ffffffff8118514d
 #17 [ffff88026d94bd60] path_walk at ffffffff811861fa
 #18 [ffff88026d94bda0] do_path_lookup at ffffffff811863cb
 #19 [ffff88026d94bdd0] do_filp_open at ffffffff811872fb
 #20 [ffff88026d94bf20] do_sys_open at ffffffff81173ee9
 #21 [ffff88026d94bf70] sys_open at ffffffff81174000
 #22 [ffff88026d94bf80] system_call_fastpath at ffffffff8100b0f2
    RIP: 000000336c4c6050  RSP: 00007fff29da4468  RFLAGS: 00010202
    RAX: 0000000000000002  RBX: ffffffff8100b0f2  RCX: 0000000000000076
    RDX: 00000000000001b6  RSI: 0000000000000100  RDI: 000000000130d840
    RBP: 0000000000000000   R8: 00682e7972747369   R9: 2f706d6f632e6f63
    R10: 65726f632f616161  R11: 0000000000000246  R12: ffffffff81174000
    R13: ffff88026d94bf78  R14: 0000000000000000  R15: 000000000130d750
    ORIG_RAX: 0000000000000002  CS: 0033  SS: 002b

Environment

  • Red Hat Enterprise Linux 6
  • IBM ClearCase versions earlier than 7.1.2.12, 8.0.0.8 and 8.0.1.1

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