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