*** This bug is a duplicate of bug 1829994 ***
https://bugs.launchpad.net/bugs/1829994
Conclusion, these are the expected behaviour.
** This bug has been marked a duplicate of bug 1829994
block_dev from kernel_misc test suite in LTP generates kernel traces
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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'
Status in Ubuntu on IBM z Systems:
Confirmed
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
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