Yes, I think we are leaking inodes. I also see this from time to time but have not managed to track down the culprit. It started happening a while back. During umount, which happens before rmmod, all open files will be closed so nothing should hold these inodes open/active. I would suspect possible deferred close. I can not really think of anything else holding an inode open after all applications have closed their handles. On Wed, 15 Feb 2023 at 21:33, Shyam Prasad N <nspmangalore@xxxxxxxxx> wrote: > > Occasionally, I see this warning during my testing with kasan kernel. > This happens when I do an rmmod. > Essentially it's complaining that there are still cifs_inode objects allocated. > > [Wed Feb 15 11:08:16 2023] > ============================================================================= > [Wed Feb 15 11:08:16 2023] BUG cifs_inode_cache (Tainted: G W > OE ): Objects remaining in cifs_inode_cache on > __kmem_cache_shutdown() > [Wed Feb 15 11:08:16 2023] > ----------------------------------------------------------------------------- > > [Wed Feb 15 11:08:16 2023] Slab 0x000000006876b569 objects=17 used=1 > fp=0x00000000762533d9 > flags=0x17ffffc0010200(slab|head|node=0|zone=2|lastcpupid=0x1fffff) > [Wed Feb 15 11:08:16 2023] CPU: 0 PID: 9331 Comm: rmmod Tainted: G > W OE 6.2.0-rc5withkasan #19 > [Wed Feb 15 11:08:16 2023] Hardware name: Microsoft Corporation > Virtual Machine/Virtual Machine, BIOS Hyper-V UEFI Release v4.0 > 12/17/2019 > [Wed Feb 15 11:08:16 2023] Call Trace: > [Wed Feb 15 11:08:16 2023] <TASK> > [Wed Feb 15 11:08:16 2023] dump_stack_lvl+0x5a/0x78 > [Wed Feb 15 11:08:16 2023] dump_stack+0x10/0x16 > [Wed Feb 15 11:08:16 2023] slab_err+0x95/0xd0 > [Wed Feb 15 11:08:16 2023] __kmem_cache_shutdown+0x14b/0x2d0 > [Wed Feb 15 11:08:16 2023] kmem_cache_destroy+0x62/0x170 > [Wed Feb 15 11:08:16 2023] exit_cifs+0x7e/0xc15 [cifs] > [Wed Feb 15 11:08:16 2023] __do_sys_delete_module.constprop.0+0x258/0x410 > [Wed Feb 15 11:08:16 2023] ? __pfx___do_sys_delete_module.constprop.0+0x10/0x10 > [Wed Feb 15 11:08:16 2023] ? __pfx___rseq_handle_notify_resume+0x10/0x10 > [Wed Feb 15 11:08:16 2023] ? __pfx_mem_cgroup_handle_over_high+0x10/0x10 > [Wed Feb 15 11:08:16 2023] ? lockdep_hardirqs_on_prepare+0x13/0x230 > [Wed Feb 15 11:08:16 2023] ? trace_hardirqs_on+0x3d/0x130 > [Wed Feb 15 11:08:16 2023] __x64_sys_delete_module+0x1f/0x30 > [Wed Feb 15 11:08:16 2023] do_syscall_64+0x59/0x90 > [Wed Feb 15 11:08:16 2023] ? lockdep_hardirqs_on_prepare+0x13/0x230 > [Wed Feb 15 11:08:16 2023] ? syscall_exit_to_user_mode+0x37/0x50 > [Wed Feb 15 11:08:16 2023] ? do_syscall_64+0x69/0x90 > [Wed Feb 15 11:08:16 2023] ? syscall_exit_to_user_mode+0x37/0x50 > [Wed Feb 15 11:08:16 2023] ? do_syscall_64+0x69/0x90 > [Wed Feb 15 11:08:16 2023] ? syscall_exit_to_user_mode+0x37/0x50 > [Wed Feb 15 11:08:16 2023] ? do_syscall_64+0x69/0x90 > [Wed Feb 15 11:08:16 2023] ? do_syscall_64+0x69/0x90 > [Wed Feb 15 11:08:16 2023] ? exc_page_fault+0x8e/0x110 > [Wed Feb 15 11:08:16 2023] entry_SYSCALL_64_after_hwframe+0x72/0xdc > [Wed Feb 15 11:08:16 2023] RIP: 0033:0x7f6912726c9b > [Wed Feb 15 11:08:16 2023] Code: 73 01 c3 48 8b 0d 95 21 0f 00 f7 d8 > 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa > b8 b0 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 65 21 0f 00 > f7 d8 64 89 01 48 > [Wed Feb 15 11:08:16 2023] RSP: 002b:00007ffdc4bb6ec8 EFLAGS: 00000206 > ORIG_RAX: 00000000000000b0 > [Wed Feb 15 11:08:16 2023] RAX: ffffffffffffffda RBX: 0000563f8c228760 > RCX: 00007f6912726c9b > [Wed Feb 15 11:08:16 2023] RDX: 000000000000000a RSI: 0000000000000800 > RDI: 0000563f8c2287c8 > [Wed Feb 15 11:08:16 2023] RBP: 0000000000000000 R08: 0000000000000000 > R09: 0000000000000000 > [Wed Feb 15 11:08:16 2023] R10: 00007f69127beac0 R11: 0000000000000206 > R12: 00007ffdc4bb7120 > [Wed Feb 15 11:08:16 2023] R13: 0000563f8c2282a0 R14: 00007ffdc4bb88f6 > R15: 0000563f8c228760 > [Wed Feb 15 11:08:16 2023] </TASK> > [Wed Feb 15 11:08:16 2023] Object 0x0000000094f20a7f @offset=21120 > [Wed Feb 15 11:08:16 2023] ------------[ cut here ]------------ > [Wed Feb 15 11:08:16 2023] kmem_cache_destroy cifs_inode_cache: Slab > cache still has objects when called from exit_cifs+0x7e/0xc15 [cifs] > [Wed Feb 15 11:08:16 2023] WARNING: CPU: 0 PID: 9331 at > mm/slab_common.c:497 kmem_cache_destroy+0x15d/0x170 > [Wed Feb 15 11:08:16 2023] Modules linked in: cifs(OE-) mptcp_diag > tcp_diag udp_diag raw_diag inet_diag unix_diag tls cmac nls_utf8 > cifs_arc4 rdma_cm iw_cm ib_cm ib_core cifs_md4 sunrpc binfmt_misc > nls_iso8859_1 intel_rapl_msr intel_rapl_common rapl serio_raw > hv_balloon hyperv_fb joydev mac_hid sch_fq_codel dm_multipath > scsi_dh_rdac scsi_dh_emc scsi_dh_alua msr ramoops reed_solomon > efi_pstore ip_tables x_tables autofs4 btrfs blake2b_generic raid10 > raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor > raid6_pq libcrc32c raid1 raid0 multipath linear hyperv_drm > drm_shmem_helper drm_kms_helper syscopyarea sysfillrect sysimgblt > hid_generic hv_storvsc hid_hyperv scsi_transport_fc drm hv_netvsc hid > hv_utils hyperv_keyboard crct10dif_pclmul crc32_pclmul > ghash_clmulni_intel sha512_ssse3 aesni_intel crypto_simd cryptd > hv_vmbus [last unloaded: cifs(OE)] > [Wed Feb 15 11:08:16 2023] CPU: 0 PID: 9331 Comm: rmmod Tainted: G > B W OE 6.2.0-rc5withkasan #19 > [Wed Feb 15 11:08:16 2023] Hardware name: Microsoft Corporation > Virtual Machine/Virtual Machine, BIOS Hyper-V UEFI Release v4.0 > 12/17/2019 > [Wed Feb 15 11:08:16 2023] RIP: 0010:kmem_cache_destroy+0x15d/0x170 > [Wed Feb 15 11:08:16 2023] Code: 49 fa c3 ff e9 6f ff ff ff c3 cc cc > cc cc 49 8b 54 24 60 48 8b 4d 08 48 c7 c6 40 75 36 91 48 c7 c7 00 a3 > c2 91 e8 46 12 28 01 <0f> 0b e9 47 ff ff ff 66 66 2e 0f 1f 84 00 00 00 > 00 00 90 90 90 90 > [Wed Feb 15 11:08:16 2023] RSP: 0018:ffff88819b6efd18 EFLAGS: 00010282 > [Wed Feb 15 11:08:16 2023] RAX: 0000000000000000 RBX: 000000004c020000 > RCX: 0000000000000000 > [Wed Feb 15 11:08:16 2023] RDX: 0000000000000001 RSI: 0000000000000004 > RDI: ffffed10336ddf95 > [Wed Feb 15 11:08:16 2023] RBP: ffff88819b6efd28 R08: ffffffff8f796e88 > R09: ffff8886841f080b > [Wed Feb 15 11:08:16 2023] R10: ffffed10d083e101 R11: 0000000000000001 > R12: ffff888109415c80 > [Wed Feb 15 11:08:16 2023] R13: ffff88819b6efe28 R14: ffffffffc134a100 > R15: 0000000000000000 > [Wed Feb 15 11:08:16 2023] FS: 00007f6912e8dc40(0000) > GS:ffff888684000000(0000) knlGS:0000000000000000 > [Wed Feb 15 11:08:16 2023] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > [Wed Feb 15 11:08:16 2023] CR2: 00007f8cf7051f40 CR3: 0000000172bdc002 > CR4: 00000000003706f0 > [Wed Feb 15 11:08:16 2023] Call Trace: > [Wed Feb 15 11:08:16 2023] <TASK> > [Wed Feb 15 11:08:16 2023] exit_cifs+0x7e/0xc15 [cifs] > [Wed Feb 15 11:08:16 2023] __do_sys_delete_module.constprop.0+0x258/0x410 > [Wed Feb 15 11:08:16 2023] ? __pfx___do_sys_delete_module.constprop.0+0x10/0x10 > [Wed Feb 15 11:08:16 2023] ? __pfx___rseq_handle_notify_resume+0x10/0x10 > [Wed Feb 15 11:08:16 2023] ? __pfx_mem_cgroup_handle_over_high+0x10/0x10 > [Wed Feb 15 11:08:16 2023] ? lockdep_hardirqs_on_prepare+0x13/0x230 > [Wed Feb 15 11:08:16 2023] ? trace_hardirqs_on+0x3d/0x130 > [Wed Feb 15 11:08:16 2023] __x64_sys_delete_module+0x1f/0x30 > [Wed Feb 15 11:08:16 2023] do_syscall_64+0x59/0x90 > [Wed Feb 15 11:08:16 2023] ? lockdep_hardirqs_on_prepare+0x13/0x230 > [Wed Feb 15 11:08:16 2023] ? syscall_exit_to_user_mode+0x37/0x50 > [Wed Feb 15 11:08:16 2023] ? do_syscall_64+0x69/0x90 > [Wed Feb 15 11:08:16 2023] ? syscall_exit_to_user_mode+0x37/0x50 > [Wed Feb 15 11:08:16 2023] ? do_syscall_64+0x69/0x90 > [Wed Feb 15 11:08:16 2023] ? syscall_exit_to_user_mode+0x37/0x50 > [Wed Feb 15 11:08:16 2023] ? do_syscall_64+0x69/0x90 > [Wed Feb 15 11:08:16 2023] ? do_syscall_64+0x69/0x90 > [Wed Feb 15 11:08:16 2023] ? exc_page_fault+0x8e/0x110 > [Wed Feb 15 11:08:16 2023] entry_SYSCALL_64_after_hwframe+0x72/0xdc > [Wed Feb 15 11:08:16 2023] RIP: 0033:0x7f6912726c9b > [Wed Feb 15 11:08:16 2023] Code: 73 01 c3 48 8b 0d 95 21 0f 00 f7 d8 > 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa > b8 b0 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 65 21 0f 00 > f7 d8 64 89 01 48 > [Wed Feb 15 11:08:16 2023] RSP: 002b:00007ffdc4bb6ec8 EFLAGS: 00000206 > ORIG_RAX: 00000000000000b0 > [Wed Feb 15 11:08:16 2023] RAX: ffffffffffffffda RBX: 0000563f8c228760 > RCX: 00007f6912726c9b > [Wed Feb 15 11:08:16 2023] RDX: 000000000000000a RSI: 0000000000000800 > RDI: 0000563f8c2287c8 > [Wed Feb 15 11:08:16 2023] RBP: 0000000000000000 R08: 0000000000000000 > R09: 0000000000000000 > [Wed Feb 15 11:08:16 2023] R10: 00007f69127beac0 R11: 0000000000000206 > R12: 00007ffdc4bb7120 > [Wed Feb 15 11:08:16 2023] R13: 0000563f8c2282a0 R14: 00007ffdc4bb88f6 > R15: 0000563f8c228760 > [Wed Feb 15 11:08:16 2023] </TASK> > [Wed Feb 15 11:08:16 2023] irq event stamp: 0 > [Wed Feb 15 11:08:16 2023] hardirqs last enabled at (0): > [<0000000000000000>] 0x0 > [Wed Feb 15 11:08:16 2023] hardirqs last disabled at (0): > [<ffffffff8f72869a>] copy_process+0xeda/0x3960 > [Wed Feb 15 11:08:16 2023] softirqs last enabled at (0): > [<ffffffff8f72869a>] copy_process+0xeda/0x3960 > [Wed Feb 15 11:08:16 2023] softirqs last disabled at (0): > [<0000000000000000>] 0x0 > [Wed Feb 15 11:08:16 2023] ---[ end trace 0000000000000000 ]--- > > > -- > Regards, > Shyam
