Comment 3 for bug 1921969

Confirmed that on a working system, just updating to the new kernel breaks it.
So that SRU kernel is definitely broken and should not be shipped.

[ 8.996651] BUG: unable to handle kernel NULL pointer dereference at 00000000e12c1a77
[ 8.998738] IP: [<00000000b372dc06>] fuse_do_setattr+0x52/0x640
[ 9.000546] PGD 80000002717c7067 PUD 270e5d067 PMD 0
[ 9.001915] Oops: 0000 [#1] SMP
[ 9.003041] Modules linked in: binfmt_misc veth ip6table_filter ip6_tables xt_CHECKSUM iptable_mangle xt_comment xt_tcpudp iptable_filter ip_tables x_tables kvm_intel kvm irqbypass bridge stp llc joydev input_leds serio_raw lpc_ich 9pnet_virtio 9pnet virtio_rng virtio_input shpchp 8250_fintek mac_hid ib_iser rdma_cm iw_cm ib_cm ib_sa ib_mad ib_core ib_addr iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi autofs4 btrfs 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 virtio_gpu ttm aesni_intel drm_kms_helper aes_x86_64 lrw syscopyarea gf128mul glue_helper ablk_helper sysfillrect ahci sysimgblt cryptd fb_sys_fops psmouse drm libahci virtio_scsi
[ 9.019982] CPU: 2 PID: 1929 Comm: mount Not tainted 4.4.0-207-generic #239-Ubuntu
[ 9.021887] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009)/LXD, BIOS 0.0.0 02/06/2015
[ 9.023893] task: 00000000b85f1580 ti: 0000000046f8cfc7 task.ti: 0000000046f8cfc7
[ 9.025775] RIP: 0010:[<ffffffff813307b2>] [<00000000b372dc06>] fuse_do_setattr+0x52/0x640
[ 9.027974] RSP: 0018:ffff880272eb7c20 EFLAGS: 00010246
[ 9.029627] RAX: 0000000000000000 RBX: ffff880272eb7e28 RCX: 000000000000000e
[ 9.031507] RDX: 0000000000000000 RSI: ffff880272eb7e28 RDI: ffff880272eb7cf8
[ 9.033447] RBP: ffff880272eb7d98 R08: 0000000000019580 R09: ffffffff8122c764
[ 9.035159] R10: ffffea0009cd8400 R11: ffff88027203c300 R12: 0000000000000000
[ 9.037004] R13: ffff880272eb7e28 R14: ffff88027203c470 R15: ffff88027203c300
[ 9.038737] FS: 00007f01e82d9840(0000) GS:ffff88027fd00000(0000) knlGS:0000000000000000
[ 9.040811] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 9.042470] CR2: 0000000000000458 CR3: 0000000273654000 CR4: 0000000000160670
[ 9.044488] Stack:
[ 9.045578] ffffffff81227c54 ffff880272eb7c84 0000000000000001 000000028186639d
[ 9.047599] 5318e6f4d6b61d94 ffff880272eb7d70 ffff880272eb7d80 ffff880272eb7d70
[ 9.049606] 0000000000000000 ffff880272eb7cf8 ffff880272eb7cf0 ffff880270e50320
[ 9.051576] Call Trace:
[ 9.052746] [<000000004f4fb5e7>] ? lookup_fast+0x184/0x340
[ 9.054366] [<000000004f4fb5e7>] ? lookup_fast+0x184/0x340
[ 9.055970] [<00000000c60c3075>] ? unlazy_walk+0xc1/0x150
[ 9.057542] [<00000000d5cd4375>] ? terminate_walk+0x66/0xd0
[ 9.059307] [<0000000051dc2989>] ? putname+0x54/0x60
[ 9.060934] [<000000005d276838>] fuse_setattr+0xa5/0xf0
[ 9.062454] [<00000000e045b853>] notify_change+0x2dc/0x430
[ 9.064177] [<000000008ae20288>] utimes_common+0xd1/0x1b0
[ 9.065694] [<000000003571704c>] do_utimes+0x125/0x160
[ 9.067102] [<00000000e85b7804>] SyS_utimensat+0x67/0xa0
[ 9.068721] [<00000000fb35cea1>] entry_SYSCALL_64_fastpath+0x22/0xd0
[ 9.070383] Code: 4c 8b 77 30 65 48 8b 04 25 28 00 00 00 48 89 84 24 48 01 00 00 31 c0 48 8d bc 24 d8 00 00 00 c7 44 24 14 00 00 00 00 49 8b 46 28 <4c> 8b b8 58 04 00 00 31 c0 f3 48 ab 41 0f b6 9f 2c 01 00 00 c0
[ 9.076396] RIP [<00000000b372dc06>] fuse_do_setattr+0x52/0x640
[ 9.078006] RSP <ffff880272eb7c20>
[ 9.079316] CR2: 0000000000000458
[ 9.080677] ---[ end trace 05c28a02c4628343 ]---