Public bug reported:

This is occurring with both 18.04, and 16.04 w/ HWE.

After upgrading the linux kernel image to 4.15.0-66, logging in with a
user that has a cephfs home directory hangs. Dmesg reports the
following:

[  221.239709] general protection fault: 0000 [#1] SMP PTI
[  221.239712] Modules linked in: ceph libceph libcrc32c fscache vboxsf(OE) 
snd_intel8x0 snd_ac97_codec crct10dif_pclmul crc32_pclmul ac97_bus 
ghash_clmulni_intel snd_pcm pcbc snd_seq_midi snd_seq_midi_event snd_rawmidi 
aesni_intel aes_x86_64 vboxvideo(OE) joydev snd_seq snd_seq_device snd_timer 
crypto_simd ttm glue_helper snd drm_kms_helper input_leds cryptd 
intel_rapl_perf soundcore serio_raw vboxguest(OE) drm fb_sys_fops syscopyarea 
sysfillrect sysimgblt video mac_hid sch_fq_codel parport_pc ppdev lp parport 
sunrpc ip_tables x_tables autofs4 hid_generic usbhid hid ahci psmouse libahci 
i2c_piix4 e1000 pata_acpi
[  221.239746] CPU: 1 PID: 1795 Comm: kworker/1:4 Tainted: G        W  OE    
4.15.0-66-generic #75-Ubuntu
[  221.239748] Hardware name: innotek GmbH VirtualBox/VirtualBox, BIOS 
VirtualBox 12/01/2006
[  221.239759] Workqueue: ceph-msgr ceph_con_workfn [libceph]
[  221.239767] RIP: 0010:kmem_cache_alloc+0x81/0x1b0
[  221.239769] RSP: 0018:ffffb208812d7ae0 EFLAGS: 00010202
[  221.239770] RAX: 0efb8a01a897ba8a RBX: 0efb8a01a897bfea RCX: 000000000000001a
[  221.239772] RDX: 0000000000000019 RSI: 0000000001400040 RDI: 00004929e00040d0
[  221.239773] RBP: ffffb208812d7b10 R08: ffffd2087fd040d0 R09: ffff88de94ad6640
[  221.239774] R10: 0000000000000000 R11: 00000000e3f68484 R12: 0000000001400040
[  221.239775] R13: ffff88de962eb800 R14: 0efb8a01a897ba8a R15: ffff88de962eb800
[  221.239777] FS:  0000000000000000(0000) GS:ffff88de9fd00000(0000) 
knlGS:0000000000000000
[  221.239778] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  221.239779] CR2: 00005604162106a8 CR3: 00000000c5e0a004 CR4: 00000000000606e0
[  221.239782] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[  221.239783] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[  221.239784] Call Trace:
[  221.239792]  ? ceph_alloc_inode+0x1d/0x3b0 [ceph]
[  221.239798]  ceph_alloc_inode+0x1d/0x3b0 [ceph]
[  221.239801]  alloc_inode+0x20/0x90
[  221.239804]  iget5_locked+0xea/0x1f0
[  221.239809]  ? ceph_d_init+0x45/0x60 [ceph]
[  221.239813]  ? ceph_ino_compare+0x30/0x30 [ceph]
[  221.239817]  ? ceph_mount+0x8a0/0x8a0 [ceph]
[  221.239822]  ceph_get_inode+0x36/0xc0 [ceph]
[  221.239827]  ceph_readdir_prepopulate+0x4e9/0xcb0 [ceph]
[  221.239834]  handle_reply+0x954/0xcc0 [ceph]
[  221.239841]  dispatch+0xcf/0xb40 [ceph]
[  221.239843]  ? __switch_to_asm+0x35/0x70
[  221.239845]  ? __switch_to_asm+0x41/0x70
[  221.239847]  ? __switch_to_asm+0x35/0x70
[  221.239848]  ? __switch_to_asm+0x41/0x70
[  221.239850]  ? __switch_to_asm+0x35/0x70
[  221.239856]  try_read+0x64a/0x11a0 [libceph]
[  221.239858]  ? __switch_to_asm+0x41/0x70
[  221.239860]  ? __switch_to_asm+0x35/0x70
[  221.239861]  ? __switch_to_asm+0x41/0x70
[  221.239863]  ? __switch_to_asm+0x35/0x70
[  221.239864]  ? __switch_to_asm+0x41/0x70
[  221.239866]  ? __switch_to_asm+0x35/0x70
[  221.239871]  ceph_con_workfn+0xda/0x610 [libceph]
[  221.239874]  process_one_work+0x1de/0x420
[  221.239876]  worker_thread+0x32/0x410
[  221.239878]  kthread+0x121/0x140
[  221.239880]  ? process_one_work+0x420/0x420
[  221.239881]  ? kthread_create_worker_on_cpu+0x70/0x70
[  221.239883]  ret_from_fork+0x35/0x40
[  221.239885] Code: f4 5b 74 49 83 78 10 00 4d 8b 30 0f 84 00 01 00 00 4d 85 
f6 0f 84 f7 00 00 00 49 63 5f 20 49 8b 3f 48 8d 4a 01 4c 89 f0 4c 01 f3 <48> 33 
1b 49 33 9f 40 01 00 00 65 48 0f c7 0f 0f 94 c0 84 c0 74 
[  221.239913] RIP: kmem_cache_alloc+0x81/0x1b0 RSP: ffffb208812d7ae0
[  221.239914] ---[ end trace 35d882be2a72b80a ]---

This happens across all workstations on our network that are upgraded to
this kernel.

This issue does not exist on 4.15.0-65, and downgrading to this kernel
returns all affected workstations to usability.

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: linux-hwe (Ubuntu)
     Importance: Undecided
         Status: New

** Also affects: linux-hwe (Ubuntu)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1849178

Title:
  upgrading linux-image package to 4.15.0-66.75 breaks Ceph network file
  system clients

Status in linux package in Ubuntu:
  New
Status in linux-hwe package in Ubuntu:
  New

Bug description:
  This is occurring with both 18.04, and 16.04 w/ HWE.

  After upgrading the linux kernel image to 4.15.0-66, logging in with a
  user that has a cephfs home directory hangs. Dmesg reports the
  following:

  [  221.239709] general protection fault: 0000 [#1] SMP PTI
  [  221.239712] Modules linked in: ceph libceph libcrc32c fscache vboxsf(OE) 
snd_intel8x0 snd_ac97_codec crct10dif_pclmul crc32_pclmul ac97_bus 
ghash_clmulni_intel snd_pcm pcbc snd_seq_midi snd_seq_midi_event snd_rawmidi 
aesni_intel aes_x86_64 vboxvideo(OE) joydev snd_seq snd_seq_device snd_timer 
crypto_simd ttm glue_helper snd drm_kms_helper input_leds cryptd 
intel_rapl_perf soundcore serio_raw vboxguest(OE) drm fb_sys_fops syscopyarea 
sysfillrect sysimgblt video mac_hid sch_fq_codel parport_pc ppdev lp parport 
sunrpc ip_tables x_tables autofs4 hid_generic usbhid hid ahci psmouse libahci 
i2c_piix4 e1000 pata_acpi
  [  221.239746] CPU: 1 PID: 1795 Comm: kworker/1:4 Tainted: G        W  OE    
4.15.0-66-generic #75-Ubuntu
  [  221.239748] Hardware name: innotek GmbH VirtualBox/VirtualBox, BIOS 
VirtualBox 12/01/2006
  [  221.239759] Workqueue: ceph-msgr ceph_con_workfn [libceph]
  [  221.239767] RIP: 0010:kmem_cache_alloc+0x81/0x1b0
  [  221.239769] RSP: 0018:ffffb208812d7ae0 EFLAGS: 00010202
  [  221.239770] RAX: 0efb8a01a897ba8a RBX: 0efb8a01a897bfea RCX: 
000000000000001a
  [  221.239772] RDX: 0000000000000019 RSI: 0000000001400040 RDI: 
00004929e00040d0
  [  221.239773] RBP: ffffb208812d7b10 R08: ffffd2087fd040d0 R09: 
ffff88de94ad6640
  [  221.239774] R10: 0000000000000000 R11: 00000000e3f68484 R12: 
0000000001400040
  [  221.239775] R13: ffff88de962eb800 R14: 0efb8a01a897ba8a R15: 
ffff88de962eb800
  [  221.239777] FS:  0000000000000000(0000) GS:ffff88de9fd00000(0000) 
knlGS:0000000000000000
  [  221.239778] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
  [  221.239779] CR2: 00005604162106a8 CR3: 00000000c5e0a004 CR4: 
00000000000606e0
  [  221.239782] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 
0000000000000000
  [  221.239783] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 
0000000000000400
  [  221.239784] Call Trace:
  [  221.239792]  ? ceph_alloc_inode+0x1d/0x3b0 [ceph]
  [  221.239798]  ceph_alloc_inode+0x1d/0x3b0 [ceph]
  [  221.239801]  alloc_inode+0x20/0x90
  [  221.239804]  iget5_locked+0xea/0x1f0
  [  221.239809]  ? ceph_d_init+0x45/0x60 [ceph]
  [  221.239813]  ? ceph_ino_compare+0x30/0x30 [ceph]
  [  221.239817]  ? ceph_mount+0x8a0/0x8a0 [ceph]
  [  221.239822]  ceph_get_inode+0x36/0xc0 [ceph]
  [  221.239827]  ceph_readdir_prepopulate+0x4e9/0xcb0 [ceph]
  [  221.239834]  handle_reply+0x954/0xcc0 [ceph]
  [  221.239841]  dispatch+0xcf/0xb40 [ceph]
  [  221.239843]  ? __switch_to_asm+0x35/0x70
  [  221.239845]  ? __switch_to_asm+0x41/0x70
  [  221.239847]  ? __switch_to_asm+0x35/0x70
  [  221.239848]  ? __switch_to_asm+0x41/0x70
  [  221.239850]  ? __switch_to_asm+0x35/0x70
  [  221.239856]  try_read+0x64a/0x11a0 [libceph]
  [  221.239858]  ? __switch_to_asm+0x41/0x70
  [  221.239860]  ? __switch_to_asm+0x35/0x70
  [  221.239861]  ? __switch_to_asm+0x41/0x70
  [  221.239863]  ? __switch_to_asm+0x35/0x70
  [  221.239864]  ? __switch_to_asm+0x41/0x70
  [  221.239866]  ? __switch_to_asm+0x35/0x70
  [  221.239871]  ceph_con_workfn+0xda/0x610 [libceph]
  [  221.239874]  process_one_work+0x1de/0x420
  [  221.239876]  worker_thread+0x32/0x410
  [  221.239878]  kthread+0x121/0x140
  [  221.239880]  ? process_one_work+0x420/0x420
  [  221.239881]  ? kthread_create_worker_on_cpu+0x70/0x70
  [  221.239883]  ret_from_fork+0x35/0x40
  [  221.239885] Code: f4 5b 74 49 83 78 10 00 4d 8b 30 0f 84 00 01 00 00 4d 85 
f6 0f 84 f7 00 00 00 49 63 5f 20 49 8b 3f 48 8d 4a 01 4c 89 f0 4c 01 f3 <48> 33 
1b 49 33 9f 40 01 00 00 65 48 0f c7 0f 0f 94 c0 84 c0 74 
  [  221.239913] RIP: kmem_cache_alloc+0x81/0x1b0 RSP: ffffb208812d7ae0
  [  221.239914] ---[ end trace 35d882be2a72b80a ]---

  This happens across all workstations on our network that are upgraded
  to this kernel.

  This issue does not exist on 4.15.0-65, and downgrading to this kernel
  returns all affected workstations to usability.

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