Public bug reported:
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 ]---
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Affects: linux (Ubuntu Bionic)
Importance: Undecided
Status: New
** Affects: linux (Ubuntu Cosmic)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1782565
Title:
s390 illegal operation
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