```
Servers:
Number of credits: 185 Dialect 0x300
1) Name: a.b.c.d Uses: 1 Capability: 0x300067 Session Status: 1 TCP status:
1 Instance: 1
Local Users To Server: 1 SecMode: 0x1 Req On Wire: 0 SessionId:
0xc1be04000435
Shares:
0) IPC: \\xxx\IPC$ Mounts: 1 DevInfo: 0x0 Attributes: 0x0
PathComponentMax: 0 Status: 1 type: 0 Serial Number: 0x0
Share Capabilities: None Share Flags: 0x30
tid: 0x1 Maximal Access: 0x11f01ff
1) \\xxx\yyy Mounts: 1 DevInfo: 0x60020 Attributes: 0xc700ff
PathComponentMax: 255 Status: 1 type: DISK Serial Number: 0xaaf791c3
Share Capabilities: DFS, Aligned, Partition Aligned, TRIM-support,
Share Flags: 0x803
tid: 0x5 Optimal sector size: 0x200 Maximal Access: 0x1200a9
MIDs:
Server interfaces: 1
0) Speed: 10000000000 bps
Capabilities:
IPv4: e.f.g.h
Debuginfo:
[ 710.383873] kernel BUG at mm/slub.c:307!
[ 710.384582] invalid opcode: 0000 [#1] SMP PTI
[ 710.385116] CPU: 1 PID: 3089 Comm: umount Not tainted 5.4.0-97-generic
#110-Ubuntu
[ 710.385775] Hardware name: VMware, Inc. VMware Virtual Platform/440BX
Desktop Reference Platform, BIOS 6.00 12/12/2018
[ 710.386903] RIP: 0010:__slab_free+0x199/0x360
[ 710.387470] Code: 00 48 89 c7 fa 66 0f 1f 44 00 00 f0 49 0f ba 2c 24 00 72
79 4d 3b 6c 24 20 74 11 49 0f ba 34 24 00 57 9d 0f 1f 44 00 00 eb 9f <0f> 0b 49
3b 5c 24 28 75 e8 48 8b 44 24 28 49 89 4c 24 28 49 89 44
[ 710.389229] RSP: 0018:ffffb94541417ce0 EFLAGS: 00010246
[ 710.389809] RAX: ffff90cfb5fab120 RBX: 000000008080007f RCX: ffff90cfb5fab120
[ 710.390406] RDX: ffff90cfb5fab120 RSI: ffffec7d84d7eac0 RDI: ffff90cfbb003880
[ 710.390993] RBP: ffffb94541417d90 R08: 0000000000000001 R09: ffffffffc08ed620
[ 710.391574] R10: ffff90cfb5fab120 R11: 0000000000000001 R12: ffffec7d84d7eac0
[ 710.392147] R13: ffff90cfb5fab120 R14: ffff90cfbb003880 R15: 0000000000000000
[ 710.392709] FS: 00007f7b219e5840(0000) GS:ffff90cfbba80000(0000)
knlGS:0000000000000000
[ 710.393274] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 710.393820] CR2: 000055a3da30b9d0 CR3: 000000012658a006 CR4: 00000000007606e0
[ 710.394545] PKRU: 55555554
[ 710.395093] Call Trace:
[ 710.395760] ? fscache_free_cookie+0x39/0x60 [fscache]
[ 710.396480] ? cifs_cleanup_volume_info_contents+0x30/0x60 [cifs]
[ 710.397026] kfree+0x231/0x250
[ 710.397593] cifs_cleanup_volume_info_contents+0x30/0x60 [cifs]
[ 710.398159] dfs_cache_del_vol+0xec/0x1a0 [cifs]
[ 710.398720] cifs_umount+0x9e/0xd0 [cifs]
[ 710.399270] cifs_kill_sb+0x1f/0x30 [cifs]
[ 710.399807] deactivate_locked_super+0x3b/0x80
[ 710.400358] deactivate_super+0x3e/0x50
[ 710.400882] cleanup_mnt+0x109/0x160
[ 710.401403] __cleanup_mnt+0x12/0x20
[ 710.401919] task_work_run+0x8f/0xb0
[ 710.402456] exit_to_usermode_loop+0x131/0x160
[ 710.402956] do_syscall_64+0x163/0x190
[ 710.403448] entry_SYSCALL_64_after_hwframe+0x44/0xa9
[ 710.403922] RIP: 0033:0x7f7b21c4a2cb
[ 710.404380] Code: 8b 0c 00 f7 d8 64 89 01 48 83 c8 ff c3 66 90 f3 0f 1e fa
31 f6 e9 05 00 00 00 0f 1f 44 00 00 f3 0f 1e fa b8 a6 00 00 00 0f 05 <48> 3d 01
f0 ff ff 73 01 c3 48 8b 0d 95 8b 0c 00 f7 d8 64 89 01 48
[ 710.405823] RSP: 002b:00007fff6a6cdc28 EFLAGS: 00000246 ORIG_RAX:
00000000000000a6
[ 710.406325] RAX: 0000000000000000 RBX: 00007f7b21d79204 RCX: 00007f7b21c4a2cb
[ 710.406811] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000560106a71ae0
[ 710.407317] RBP: 0000560106a6a890 R08: 0000000000000000 R09: 00007fff6a6cc9a0
[ 710.407790] R10: 00007f7b21d65339 R11: 0000000000000246 R12: 0000560106a71ae0
[ 710.408249] R13: 0000000000000000 R14: 0000560106a6a988 R15: 0000560106a6aaa0
[ 710.408707] Modules linked in: md4 cmac nls_utf8 cifs libarc4 fscache libdes
vmw_vsock_vmci_transport vsock dm_multipath scsi_dh_rdac scsi_dh_emc
scsi_dh_alua intel_rapl_msr intel_rapl_common isst_if_mbox_msr isst_if_common
nfit rapl vmw_balloon joydev input_leds serio_raw vmw_vmci mac_hid sch_fq_codel
msr ip_tables x_tables autofs4 btrfs zstd_compress raid10 raid456
async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq
libcrc32c raid1 raid0 multipath linear crct10dif_pclmul crc32_pclmul
ghash_clmulni_intel aesni_intel crypto_simd cryptd glue_helper vmwgfx ttm
psmouse drm_kms_helper syscopyarea ahci sysfillrect sysimgblt vmw_pvscsi
libahci fb_sys_fops vmxnet3 pata_acpi drm i2c_piix4
[ 710.412749] ---[ end trace c3b4f6aeb4b07511 ]---
[ 710.413274] RIP: 0010:__slab_free+0x199/0x360
[ 710.413781] Code: 00 48 89 c7 fa 66 0f 1f 44 00 00 f0 49 0f ba 2c 24 00 72
79 4d 3b 6c 24 20 74 11 49 0f ba 34 24 00 57 9d 0f 1f 44 00 00 eb 9f <0f> 0b 49
3b 5c 24 28 75 e8 48 8b 44 24 28 49 89 4c 24 28 49 89 44
[ 710.415405] RSP: 0018:ffffb94541417ce0 EFLAGS: 00010246
[ 710.415948] RAX: ffff90cfb5fab120 RBX: 000000008080007f RCX: ffff90cfb5fab120
[ 710.416497] RDX: ffff90cfb5fab120 RSI: ffffec7d84d7eac0 RDI: ffff90cfbb003880
[ 710.417042] RBP: ffffb94541417d90 R08: 0000000000000001 R09: ffffffffc08ed620
[ 710.417600] R10: ffff90cfb5fab120 R11: 0000000000000001 R12: ffffec7d84d7eac0
[ 710.418150] R13: ffff90cfb5fab120 R14: ffff90cfbb003880 R15: 0000000000000000
[ 710.418720] FS: 00007f7b219e5840(0000) GS:ffff90cfbba80000(0000)
knlGS:0000000000000000
[ 710.419284] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 710.419852] CR2: 000055a3da30b9d0 CR3: 000000012658a006 CR4: 00000000007606e0
[ 710.420478] PKRU: 55555554
```
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https://bugs.launchpad.net/bugs/1959665
Title:
linux-image-5.4.0-97.110 freezes by accessing cifs shares
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