[LU-15757] sanityn test_109: Oops in ll_md_blocking_ast() at umount

• Type: Bug
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.16.0, Lustre 2.15.0, Lustre 2.15.2
• Affects Version/s: Upstream, Lustre 2.15.0
• Severity: 3
• Assignee: Alex Zhuravlev
• Reporter: Alex Zhuravlev

Description

Trace:
PID: 622621  TASK: ffff89d05b2117c0  CPU: 1   COMMAND: "ll_imp_inval"
 #0 [ffff89d04d307b70] panic at ffffffff860af786
    /tmp/kernel/kernel/panic.c: 299
 #1 [ffff89d04d307c00] ll_md_blocking_ast at ffffffffc1919052 [lustre]
    /home/lustre/master-mine/lustre/llite/namei.c: 388
 #2 [ffff89d04d307c60] ldlm_cancel_callback at ffffffffc0fc074c [ptlrpc]
    /home/lustre/master-mine/lustre/ptlrpc/../../lustre/ldlm/ldlm_lock.c: 2445
 #3 [ffff89d04d307cb0] ldlm_cli_cancel_local at ffffffffc0fd8ce6 [ptlrpc]
    /home/lustre/master-mine/lustre/ptlrpc/../../lustre/ldlm/ldlm_request.c: 1244
 #4 [ffff89d04d307cd0] ldlm_cli_cancel at ffffffffc0fde6a8 [ptlrpc]
    /home/lustre/master-mine/lustre/ptlrpc/../../lustre/ldlm/ldlm_request.c: 1569
 #5 [ffff89d04d307d30] cleanup_resource_queue at ffffffffc0fc278c [ptlrpc]
    /home/lustre/master-mine/lustre/ptlrpc/../../lustre/ldlm/ldlm_resource.c: 1091
 #6 [ffff89d04d307d80] ldlm_resource_cleanup at ffffffffc0fc2914 [ptlrpc]
    /home/lustre/master-mine/lustre/ptlrpc/../../lustre/ldlm/ldlm_resource.c: 1106
 #7 [ffff89d04d307d98] ldlm_resource_clean_hash at ffffffffc0fc294c [ptlrpc]
    /home/lustre/master-mine/lustre/ptlrpc/../../lustre/ldlm/ldlm_resource.c: 1119
 #8 [ffff89d04d307da8] cfs_hash_for_each_relax at ffffffffc0b39cc5 [libcfs]
    /home/lustre/master-mine/libcfs/libcfs/hash.c: 1644
 #9 [ffff89d04d307e20] cfs_hash_for_each_nolock at ffffffffc0b3d40f [libcfs]
    /home/lustre/master-mine/libcfs/include/libcfs/libcfs_hash.h: 402
#10 [ffff89d04d307e48] ldlm_namespace_cleanup at ffffffffc0fc2ce6 [ptlrpc]
    /home/lustre/master-mine/lustre/ptlrpc/../../lustre/ldlm/ldlm_resource.c: 1163
#11 [ffff89d04d307e60] mdc_import_event at ffffffffc13456f6 [mdc]
    /home/lustre/master-mine/lustre/mdc/mdc_request.c: 2712
#12 [ffff89d04d307e90] ptlrpc_invalidate_import at ffffffffc102460d [ptlrpc]
    /home/lustre/master-mine/libcfs/include/libcfs/libcfs_debug.h: 154

after adding an additional assertiong:

        if ((bits & (MDS_INODELOCK_LOOKUP | MDS_INODELOCK_PERM))) {
                LASSERT(inode);
                LASSERT(inode->i_sb);
                LASSERT(inode->i_sb->s_root);
        }      

it's:

LustreError: 622621:0:(namei.c:389:ll_lock_cancel_bits()) ASSERTION( inode->i_sb->s_root ) failed
BUG: unable to handle kernel NULL pointer dereference at 0000000000000030

Issue Links

• is related to: LU-15305 sanityn test_109 crash: list_del corruption in class_del_profile()
• is related to: LU-15835 sanityn test_102: [20108.951589] WARNING: CPU: 1 PID: 722753 at fs/exportfs/expfs.c:96 reconnect_path+0x22b/0x2c0
• is related to: LU-6142 Enforce Linux kernel coding style in all code