Copied the bug description from comment #1 into the LP bug description
field.
** Description changed:
- Description will follow
+ Running LTP test on Ubuntu Server 18.04.3 (kernel 4.15) on s390x results
+ in the following warning stack trace in the journalctl.
+
+ Oct 29 22:47:43 t35lp04 kernel: ltp_block_dev: Test Case 5:
+ register_blkdev() with major=512/4294967295 Oct 29 22:47:43 t35lp04
+ kernel: register_blkdev: major requested (512) is greater than the
+ maximum (512) for ltp_block_dev Oct 29 22:47:43 t35lp04 kernel:
+ register_blkdev: major requested (-1) is greater than the maximum (512)
+ for ltp_block_dev Oct 29 22:47:43 t35lp04 kernel: ltp_block_dev: Test
+ Case Result: PASS Oct 29 22:47:43 t35lp04 kernel: ltp_block_dev: Test
+ Case 6: register_blkdev() with name="" Oct 29 22:47:43 t35lp04 kernel:
+ ltp_block_dev: Test Case Result: PASS Oct 29 22:47:43 t35lp04 kernel:
+ ltp_block_dev: Test Case 7: unregister_blkdev() with major=0 Oct 29
+ 22:47:43 t35lp04 kernel: ------------[ cut here ]------------ Oct 29
+ 22:47:43 t35lp04 kernel: WARNING: CPU: 10 PID: 93645 at /build/linux-
+ ru4Kqk/linux-4.15.0/block/genhd.c:412 unregister_blkdev+0xb6/0x110 Oct
+ 29 22:47:43 t35lp04 kernel: Modules linked in: ltp_block_dev(OE) vmac
+ chacha20_generic poly1305_generic chacha20poly1305 algif_aead authenc
+ pcrypt crypto_user xfrm_user xfrm_algo sha3_generic algif_hash
+ salsa20_generic algif_skcipher af_alg msdos dummy veth binfmt_misc sctp
+ brd nls_utf8 nls_iso8859_1 ntfs btrfs xor zstd_compress zlib_deflate
+ raid6_pq xfs libcrc32c overlay dm_multipath scsi_dh_rdac scsi_dh_emc
+ scsi_dh_alua s390_trng ghash_s390 prng aes_s390 des_s390 des_generic
+ qeth_l2 sha512_s390 sha256_s390 sha1_s390 sha_common chsc_sch eadm_sch
+ qeth ccwgroup vfio_ccw vfio_mdev mdev vfio_iommu_type1 vfio sch_fq_codel
+ ip_tables x_tables crc32_vx_s390 zfcp qdio scsi_transport_fc
+ dasd_eckd_mod dasd_mod [last unloaded: ltp_fw_load] Oct 29 22:47:43
+ t35lp04 kernel: CPU: 10 PID: 93645 Comm: block_dev Tainted: G OE
+ 4.15.0-66-generic #75-Ubuntu Oct 29 22:47:43 t35lp04 kernel: Hardware
+ name: IBM 8561 T01 403 (LPAR) Oct 29 22:47:43 t35lp04 kernel: Krnl PSW :
+ 00000000dbddaa8b 00000000a41f3293 (unregister_blkdev+0xb6/0x110) Oct 29
+ 22:47:43 t35lp04 kernel: R:0 T:1 IO:1 EX:1 Key:0 M:1 W:0 P:0 AS:3 CC:0
+ PM:0 RI:0 EA:3 Oct 29 22:47:43 t35lp04 kernel: Krnl GPRS:
+ 0000000000000800 0000000000000006 0000000000000024 0000000000000007 Oct
+ 29 22:47:43 t35lp04 kernel: 00000000005c6672 000000007fe03000
+ 0000000000000001 000002aa3f9de4c0 Oct 29 22:47:43 t35lp04 kernel:
+ 00000004569dbf00 0000000000000001 000003ff800be11c 0000000000000000 Oct
+ 29 22:47:43 t35lp04 kernel: 0000000000000000 000000000094ebb0
+ 00000000005c6672 00000004569dbd10 Oct 29 22:47:43 t35lp04 kernel: Krnl
+ Code: 00000000005c6666: c02000260c97 larl %r2,a87f94 00000000005c666c:
+ c0e5ffe0f502 brasl %r14,1e5070 #00000000005c6672: a7f40001 brc 15,5c6674
+ >00000000005c6676: a7c90000 lghi %r12,0 00000000005c667a: a7f4001c brc
+ 15,5c66b2 00000000005c667e: ec2c1dbc0359 risbgn %r2,%r12,29,188,3
+ 00000000005c6684: b90400c1 lgr %r12,%r1 00000000005c6688: c010004cd4b8
+ larl %r1,f60ff8 Oct 29 22:47:43 t35lp04 kernel: Call Trace: Oct 29
+ 22:47:43 t35lp04 kernel: ([<00000000005c6672>]
+ unregister_blkdev+0xb2/0x110) Oct 29 22:47:43 t35lp04 kernel:
+ [<000003ff800bd798>] sys_tcase+0x560/0x9a0 [ltp_block_dev] Oct 29
+ 22:47:43 t35lp04 kernel: [<000000000042c7fc>]
+ kernfs_fop_write+0xdc/0x218 Oct 29 22:47:43 t35lp04 kernel:
+ [<000000000038a1fc>] vfs_write+0x184/0x1e8 Oct 29 22:47:43 t35lp04
+ kernel: [<000000000038a444>] SyS_write+0x6c/0xf0 Oct 29 22:47:43 t35lp04
+ kernel: [<00000000008f7454>] system_call+0xd8/0x2c8 Oct 29 22:47:43
+ t35lp04 kernel: Last Breaking-Event-Address: Oct 29 22:47:43 t35lp04
+ kernel: [<00000000005c6672>] unregister_blkdev+0xb2/0x110 Oct 29
+ 22:47:43 t35lp04 kernel: ---[ end trace e89fa54649b0cc78 ]--- Oct 29
+ 22:47:43 t35lp04 kernel: ltp_block_dev: Test Case Result: PASS Oct 29
+ 22:47:43 t35lp04 kernel: ltp_block_dev: device released Oct 29 22:47:43
+ t35lp04 LTP: starting tpci Oct 29 22:47:43 t35lp04 LTP: starting tbio
** Also affects: ubuntu-z-systems
Importance: Undecided
Status: New
** Changed in: ubuntu-z-systems
Importance: Undecided => Medium
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https://bugs.launchpad.net/bugs/1852294
Title:
Ubuntu18.04.3 - LTP testcase gets stacktrace running 'kernel:
ltp_block_dev: Test Case 7: unregister_blkdev() with major=0'
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