Hello, I did a simple test to modprobe and remove a module and hit a scary WARNING in the slab code. I was able to reproduce this issue usually in the first attempt but in a few tests I had to repeat the modprobe/rmmod a few times. I tried a few modules and the ones that triggered the issue were cifs and nfs. === clean boot === [root@neverland ~]# modprobe cifs; rmmod cifs [ 1818.065143] slab error in kmem_cache_destroy(): cache `cifs_mpx_ids': Can't free all objects [ 1818.065149] Pid: 8512, comm: rmmod Not tainted 3.0.6-rt16+ #21 [ 1818.065151] Call Trace: [ 1818.065160] [<ffffffff810faf07>] kmem_cache_destroy+0x81/0xd0 [ 1818.065172] [<ffffffffa0528769>] cifs_destroy_mids+0x21/0x23 [cifs] [ 1818.065182] [<ffffffffa0528982>] exit_cifs+0x26/0x2d [cifs] [ 1818.065187] [<ffffffff810755ca>] sys_delete_module+0x1ba/0x22c [ 1818.065208] [<ffffffff8108ebfa>] ? audit_syscall_entry+0x11c/0x148 [ 1818.065212] [<ffffffff813c25c2>] system_call_fastpath+0x16/0x1b [ 1818.065362] slab error in kmem_cache_destroy(): cache `cifs_small_rq': Can't free all objects [ 1818.065364] Pid: 8512, comm: rmmod Not tainted 3.0.6-rt16+ #21 [ 1818.065366] Call Trace: [ 1818.065368] [<ffffffff810faf07>] kmem_cache_destroy+0x81/0xd0 [ 1818.065375] [<ffffffffa05287a4>] cifs_destroy_request_bufs+0x39/0x3b [cifs] [ 1818.065381] [<ffffffffa0528987>] exit_cifs+0x2b/0x2d [cifs] [ 1818.065384] [<ffffffff810755ca>] sys_delete_module+0x1ba/0x22c [ 1818.065387] [<ffffffff8108ebfa>] ? audit_syscall_entry+0x11c/0x148 [ 1818.065390] [<ffffffff813c25c2>] system_call_fastpath+0x16/0x1b [root@neverland ~]# modprobe cifs; rmmod cifs [ 1882.573468] SLAB: cache with size 448 has lost its name [ 1882.573474] SLAB: cache with size 128 has lost its name [ 1882.573532] SLAB: cache with size 448 has lost its name [ 1882.573536] SLAB: cache with size 128 has lost its name [ 1882.573590] SLAB: cache with size 448 has lost its name [ 1882.573594] SLAB: cache with size 128 has lost its name [ 1882.573695] SLAB: cache with size 448 has lost its name [ 1882.573700] SLAB: cache with size 128 has lost its name === reboot === [root@neverland ~]# modprobe nfs; rmmod nfs [root@neverland ~]# modprobe nfs; rmmod nfs [ 164.167470] slab error in kmem_cache_destroy(): cache `nfs_read_data': Can't free all objects [ 164.167474] Pid: 8938, comm: rmmod Not tainted 3.0.6-rt16+ #21 [ 164.167476] Call Trace: [ 164.167483] [<ffffffff810faf07>] kmem_cache_destroy+0x81/0xd0 [ 164.167498] [<ffffffffa0541312>] nfs_destroy_readpagecache+0x21/0x23 [nfs] [ 164.167510] [<ffffffffa055a5be>] exit_nfs_fs+0x13/0x46 [nfs] [ 164.167514] [<ffffffff810755ca>] sys_delete_module+0x1ba/0x22c [ 164.167519] [<ffffffff8108ebfa>] ? audit_syscall_entry+0x11c/0x148 [ 164.167523] [<ffffffff813c25c2>] system_call_fastpath+0x16/0x1b [ 165.465486] SLAB: cache with size 768 has lost its name [ 165.465553] SLAB: cache with size 768 has lost its name [ 165.465602] SLAB: cache with size 768 has lost its name [ 165.465815] SLAB: cache with size 768 has lost its name [ 165.465956] SLAB: cache with size 768 has lost its name Cheers, Luis -- [ Luis Claudio R. Goncalves Bass - Gospel - RT ] [ Fingerprint: 4FDD B8C4 3C59 34BD 8BE9 2696 7203 D980 A448 C8F8 ] -- To unsubscribe from this list: send the line "unsubscribe linux-rt-users" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
