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 -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. 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' Status in Ubuntu on IBM z Systems: New Status in linux package in Ubuntu: New Bug description: 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 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-z-systems/+bug/1852294/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp