[Expired for linux (Ubuntu Cosmic) because there has been no activity
for 60 days.]

** Changed in: linux (Ubuntu Cosmic)
       Status: Incomplete => Expired

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https://bugs.launchpad.net/bugs/1782565

Title:
  s390 illegal operation

Status in linux package in Ubuntu:
  Expired
Status in linux source package in Bionic:
  Expired
Status in linux source package in Cosmic:
  Expired

Bug description:
  Managed to break sysfs when running:

  sudo ./stress-ng  --sysfs 4 -t 60 -v --verify

  
  Kernel: 4.15.0-29-generic and 4.17 too, this seems to occur on previous 4.15 
kernels but I've not tested too far back.

  
  [   45.057702] ------------[ cut here ]------------
  [   45.057704] kernel BUG at 
/build/linux-4OqUyO/linux-4.15.0/drivers/block/virtio_blk.c:565!
  [   45.057773] illegal operation: 0001 ilc:1 [#1] SMP 
  [   45.057775] Modules linked in: binfmt_misc zfs(PO) zunicode(PO) zavl(PO) 
icp(PO) isofs zcommon(PO) znvpair(PO) spl(O) ghash_s390 prng aes_s390 des_s390 
des_generic sha512_s390 sha256_s390 sha1_s390 sha_common vfio_ccw vfio_mdev 
mdev vfio_iommu_type1 vfio sch_fq_codel ib_iser rdma_cm iw_cm ib_cm ib_core 
iscsi_tcp libiscsi_tcp libiscsi nfsd auth_rpcgss nfs_acl lockd grace 
scsi_transport_iscsi sunrpc ip_tables x_tables btrfs zstd_compress zlib_deflate 
raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor 
raid6_pq libcrc32c raid1 raid0 linear crc32_vx_s390 virtio_net virtio_blk
  [   45.057805] CPU: 0 PID: 5056 Comm: stress-ng-sysfs Tainted: P           O  
   4.15.0-29-generic #31-Ubuntu
  [   45.057806] Hardware name: IBM 2964 N63 400 (KVM/Linux)
  [   45.057809] Krnl PSW : 000000002a20609d 00000000800ebb38 
(virtblk_cache_type_show+0x82/0x88 [virtio_blk])
  [   45.057814]            R:0 T:1 IO:1 EX:1 Key:0 M:1 W:0 P:0 AS:3 CC:2 PM:0 
RI:0 EA:3
  [   45.057816] Krnl GPRS: de6dc5c2778317a7 000000007ff93a20 0000000000000080 
0000000000001164
  [   45.057818]            000003ff800058da 0000000000001165 000000006b9cc840 
000000007061a100
  [   45.057819]            0000000000000000 000000000068feb8 0000000072c30d80 
0000000071972000
  [   45.057821]            000003ff80008210 0000000000001000 000003ff800058da 
0000000070a47ce8
  [   45.057830] Krnl Code: 000003ff80005912: ebbff0a80004      lmg     
%r11,%r15,168(%r15)
                            000003ff80005918: c0f400000560      brcl    
15,3ff800063d8
                           #000003ff8000591e: a7f40001          brc     
15,3ff80005920
                           >000003ff80005922: 0707              bcr     0,%r7
                            000003ff80005924: 0707              bcr     0,%r7
                            000003ff80005926: 0707              bcr     0,%r7
                            000003ff80005928: c00400000000      brcl    
0,3ff80005928
                            000003ff8000592e: eb6ff0480024      stmg    
%r6,%r15,72(%r15)
  [   45.057844] Call Trace:
  [   45.057847] ([<000003ff800058da>] virtblk_cache_type_show+0x3a/0x88 
[virtio_blk])
  [   45.057852]  [<000000000068fef4>] dev_attr_show+0x3c/0x80 
  [   45.057858]  [<0000000000424414>] sysfs_kf_seq_show+0xbc/0x1a8 
  [   45.057862]  [<00000000003afddc>] seq_read+0xec/0x4c8 
  [   45.057865]  [<0000000000381bba>] vfs_read+0x8a/0x150 
  [   45.057867]  [<0000000000382156>] SyS_read+0x66/0xe0 
  [   45.057872]  [<00000000008e2350>] system_call+0xdc/0x2c8 
  [   45.057873] Last Breaking-Event-Address:
  [   45.057875]  [<000003ff8000591e>] virtblk_cache_type_show+0x7e/0x88 
[virtio_blk]
  [   45.057876]  
  [   45.057877] ---[ end trace 49fd8401e53e0e99 ]---

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