kernel BUG at fs/fscache/operation.c:70! - FS-Cache: 4 == 5 is false

Issue

• kernel crashes with following logs:

[ 2259.612361] FS-Cache: 
[ 2259.614785] FS-Cache: Assertion failed
[ 2259.618639] FS-Cache: 4 == 5 is false
[ 2259.622456] ------------[ cut here ]------------
[ 2259.627190] kernel BUG at fs/fscache/operation.c:70!
[ 2259.632292] invalid opcode: 0000 [#1] SMP 
[ 2259.764435] CPU: 77 PID: 40132 Comm: python Kdump: loaded Tainted: P           OE  ------------ T 3.10.0-1062.23.1.el7.x86_64 #1
[ 2259.776303] Hardware name: NVIDIA NVIDIA DGX-2/NVIDIA DGX-2, BIOS 0.24 06/27/2019
[ 2259.783991] task: ffff9fd431c85230 ti: ffff9fd431cb0000 task.ti: ffff9fd431cb0000
[ 2259.791675] RIP: 0010:[<ffffffffc061b4cf>]  [<ffffffffc061b4cf>] fscache_enqueue_operation+0xff/0x170 [fscache]
[ 2259.802059] RSP: 0000:ffffa0263d543be0  EFLAGS: 00010046
[ 2259.807521] RAX: 0000000000000019 RBX: ffffa01a4d390480 RCX: 0000000000000006
[ 2259.814847] RDX: 0000000000000000 RSI: 0000000000000046 RDI: ffffa0263d553890
[ 2259.822176] RBP: ffffa0263d543be8 R08: 0000000000000000 R09: ffffa0263c2d8708
[ 2259.829502] R10: 0000000000001e7f R11: 0000000000000000 R12: ffffa01a4d390480
[ 2259.844483] R13: ffff9fa9546c5920 R14: ffffa0263d543c80 R15: ffffa0293ff9bf10
[ 2259.859554] FS:  00007f4b6efbd700(0000) GS:ffffa0263d540000(0000) knlGS:0000000000000000
[ 2259.875571] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 2259.889117] CR2: 00007f49e1624ff0 CR3: 0000012b38b38000 CR4: 00000000007607e0
[ 2259.904015] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 2259.918764] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 2259.933449] PKRU: 55555554
[ 2259.943654] Call Trace:
[ 2259.953592]  <IRQ> 
[ 2259.955577]  [<ffffffffc03a7c12>] cachefiles_read_waiter+0x92/0xf0 [cachefiles]
[ 2259.978039]  [<ffffffffa34d3942>] __wake_up_common+0x82/0x120
[ 2259.991392]  [<ffffffffa34d3a63>] __wake_up_common_lock+0x83/0xc0
[ 2260.004930]  [<ffffffffa34d3510>] ? task_rq_unlock+0x20/0x20
[ 2260.017863]  [<ffffffffa34d3ab3>] __wake_up+0x13/0x20
[ 2260.030230]  [<ffffffffa34c72a0>] __wake_up_bit+0x50/0x70
[ 2260.042535]  [<ffffffffa35bdcdb>] unlock_page+0x2b/0x30
[ 2260.054495]  [<ffffffffa35bdd09>] page_endio+0x29/0x90
[ 2260.066184]  [<ffffffffa368fc81>] mpage_end_io+0x51/0x80
[ 2260.077864]  [<ffffffffa3689de7>] bio_endio+0x67/0xb0
[ 2260.089104]  [<ffffffffa37519d0>] blk_update_request+0x90/0x360
[ 2260.101063]  [<ffffffffa375bb7a>] blk_mq_end_request+0x1a/0x70
[ 2260.112744]  [<ffffffffc00bfd9c>] nvme_complete_rq+0x1c/0xe0 [nvme_core]
[ 2260.125171]  [<ffffffffc0101e70>] nvme_pci_complete_rq+0x50/0x140 [nvme]
[ 2260.137448]  [<ffffffffa375bd26>] __blk_mq_complete_request+0x156/0x1e0
[ 2260.149485]  [<ffffffffa375bdd7>] blk_mq_complete_request+0x27/0x30
[ 2260.161015]  [<ffffffffc01020b2>] nvme_irq+0x152/0x210 [nvme]
[ 2260.171876]  [<ffffffffa354fe14>] __handle_irq_event_percpu+0x44/0x1c0
[ 2260.183454]  [<ffffffffa354ffc2>] handle_irq_event_percpu+0x32/0x80
[ 2260.194660]  [<ffffffffa355004c>] handle_irq_event+0x3c/0x60
[ 2260.205118]  [<ffffffffa3552e3f>] handle_edge_irq+0x7f/0x150
[ 2260.215414]  [<ffffffffa342f5f4>] handle_irq+0xe4/0x1a0
[ 2260.225081]  [<ffffffffa3b9487d>] do_IRQ+0x4d/0xf0
[ 2260.234247]  [<ffffffffa3b8636a>] common_interrupt+0x16a/0x16a
[ 2260.244415]  <EOI> 
[ 2260.246392] Code: 
[ 2260.252695] 31 c0 e8 a7 a6 55 e3 48 c7 c7 b0 08 62 c0 31 c0 e8 99 a6 55 e3 8b 73 40 ba 05 00 00 00 48 c7 c7 a8 fd 61 c0 31 c0 e8 83 a6 55 e3 <0f> 0b 48 c7 c7 a2 08 62 c0 31 c0 e8 73 a6 55 e3 48 c7 c7 b0 08 
[ 2260.285104] RIP  [<ffffffffc061b4cf>] fscache_enqueue_operation+0xff/0x170 [fscache]
[ 2260.297661]  RSP <ffffa0263d543be0>