Comment 9 for bug 1424342

Call trace from :

DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=16.04
DISTRIB_CODENAME=xenial
DISTRIB_DESCRIPTION="Ubuntu 16.04.4 LTS"

Kernel :

4.15.0-1013-azure

[509728.136002] watchdog: BUG: soft lockup - CPU#1 stuck for 23s! [nginx:57149]
[509728.136002] Modules linked in: binfmt_misc nf_conntrack_ipv4 nf_defrag_ipv4 xt_owner xt_multiport iptable_security xt_conntrack nf_conntrack iptable_filter ip_tables x_tables cmac arc4 md4 nls_utf8 cifs ccm fscache kvm_intel kvm irqbypass hv_balloon serio_raw joydev 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 hid_generic crc32_pclmul ghash_clmulni_intel pcbc aesni_intel aes_x86_64 crypto_simd glue_helper cryptd hyperv_keyboard hid_hyperv hid hv_utils hv_netvsc hyperv_fb cfbfillrect cfbimgblt cfbcopyarea pata_acpi
[509728.136002] CPU: 1 PID: 57149 Comm: nginx Tainted: G D L 4.15.0-1013-azure #13~16.04.2-Ubuntu
[509728.136002] Hardware name: Microsoft Corporation Virtual Machine/Virtual Machine, BIOS 090007 06/02/2017
[509728.136002] RIP: 0010:native_queued_spin_lock_slowpath+0x25/0x1a0
[509728.136002] RSP: 0018:ffffbc80c5de3d30 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff0c
[509728.136002] RAX: 0000000000000001 RBX: ffff959c10fe7038 RCX: 0000000000000000
[509728.136002] RDX: 0000000000000001 RSI: 0000000000000001 RDI: ffff959c10fe7038
[509728.136002] RBP: ffffbc80c5de3d30 R08: 0000000000000000 R09: 0000000000000000
[509728.136002] R10: ffffbc80c5de3e40 R11: ffff959c08ba8410 R12: ffff959c11db2200
[509728.136002] R13: ffff959c10fe7000 R14: ffff959c11a802a4 R15: ffff959c11a80200
[509728.136002] FS: 0000000000000000(0000) GS:ffff959c15640000(0000) knlGS:0000000000000000
[509728.136002] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[509728.136002] CR2: 00007f1752676bd0 CR3: 000000017040a000 CR4: 00000000001406e0
[509728.136002] Call Trace:
[509728.136002] _raw_spin_lock+0x20/0x30
[509728.136002] cifsFileInfo_put+0x8c/0x430 [cifs]
[509728.136002] ? __slab_free+0xd0/0x2f0
[509728.136002] ? kmem_cache_free+0x1cb/0x1e0
[509728.136002] cifs_close+0x1e/0x40 [cifs]
[509728.136002] ? cifs_close+0x1e/0x40 [cifs]
[509728.136002] __fput+0xea/0x220
[509728.136002] ____fput+0xe/0x10
[509728.136002] task_work_run+0x8a/0xb0
[509728.136002] do_exit+0x2de/0xb50
[509728.136002] rewind_stack_do_exit+0x17/0x20
[509728.136002] RIP: 0033:0x7fbe2c393c60
[509728.136002] RSP: 002b:00007ffdd29e23a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
[509728.136002] RAX: ffffffffffffffda RBX: 00007ffdd29e2650 RCX: 00007fbe2c393c60
[509728.136002] RDX: 0000000000000000 RSI: 0000000000000800 RDI: 0000563a210a2c50
[509728.136002] RBP: 0000563a210ba530 R08: 0000000000000000 R09: 0000563a210ba530
[509728.136002] R10: 0000000061685475 R11: 0000000000000246 R12: 00007ffdd29e2630
[509728.136002] R13: 00007ffdd29e2650 R14: 00007ffdd29e2650 R15: 00007ffdd29e2650
[509728.136002] Code: 84 00 00 00 00 00 0f 1f 44 00 00 55 48 89 e5 0f 1f 44 00 00 ba 01 00 00 00 8b 07 85 c0 75 0a f0 0f b1 17 85 c0 75 f2 5d c3 f3 90 <eb>ec 81 fe 00 01 00 00 0f 84 92 00 00 00 41 b8 01 01 00 00 b9