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Message-ID: <dca3fb23-5d0f-4b62-bf7a-24d7e1fef3fe@linux.ibm.com>
Date: Mon, 28 Apr 2025 12:37:43 +0530
From: Venkat Rao Bagalkote <venkat88@...ux.ibm.com>
To: LKML <linux-kernel@...r.kernel.org>, linux-block@...r.kernel.org,
Nilay Shroff <nilay@...ux.ibm.com>, shinichiro.kawasaki@....com,
Madhavan Srinivasan <maddy@...ux.ibm.com>
Subject: [mainline]WARNING: CPU: 29 PID: 1121679 at block/genhd.c:302
unregister_blkdev+0x1e8/0x2b0
Hello,
I am observing kernel warnings on the mainline kernel, while running
block_dev Tests from LTP test suite, on IBM Power servers.
Repo: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
I have not started the bisection yet.
Warnings:
[13323.500222] ltp_block_dev: Test Case 7: unregister_blkdev() with major=0
[13323.500232] ------------[ cut here ]------------
[13323.500236] WARNING: CPU: 29 PID: 1121679 at block/genhd.c:302
unregister_blkdev+0x1e8/0x2b0
[13323.500245] Modules linked in: ltp_block_dev(O) dummy veth
dns_resolver tun brd overlay exfat vfat fat btrfs blake2b_generic xor
raid6_pq zstd_compress xfs loop sctp ip6_udp_tunnel udp_tunnel
nft_fib_inet nft_fib_ipv4 nft_fib_ipv6 nft_fib nft_reject_inet
nf_reject_ipv4 nf_reject_ipv6 nft_reject nft_ct nft_chain_nat nf_nat
nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 bonding tls rfkill ip_set
nf_tables nfnetlink pseries_rng vmx_crypto dax_pmem fuse ext4 crc16
mbcache jbd2 sd_mod sg nd_pmem nd_btt papr_scm ibmvscsi
scsi_transport_srp ibmveth libnvdimm [last unloaded: ltp_fw_load(O)]
[13323.500297] CPU: 29 UID: 0 PID: 1121679 Comm: block_dev Kdump: loaded
Tainted: G M O K 6.15.0-rc3-gbc3372351d0c #1 VOLUNTARY
[13323.500304] Tainted: [M]=MACHINE_CHECK, [O]=OOT_MODULE, [K]=LIVEPATCH
[13323.500313] NIP: c000000000882d40 LR: c000000000882bc0 CTR:
c000000000882b58
[13323.500317] REGS: c00000006ff0f8b0 TRAP: 0700 Tainted: G M O
K (6.15.0-rc3-gbc3372351d0c)
[13323.500322] MSR: 8000000000029033 <SF,EE,ME,IR,DR,RI,LE> CR:
28008222 XER: 2004000d
[13323.500331] CFAR: c000000000882be4 IRQMASK: 0
[13323.500331] GPR00: c000000000882bc0 c00000006ff0fb50 c000000001688100
c000000002fdb2e8
[13323.500331] GPR04: c008000006790118 000000000000000d 000000000000003b
fffffffffffe0000
[13323.500331] GPR08: 0000000000000000 0000000000000000 0000000000000000
c008000006691498
[13323.500331] GPR12: c000000000882b58 c000000efde70300 0000000000000000
0000000000000000
[13323.500331] GPR16: 0000000000000000 0000000000000000 0000000000000000
0000000000000000
[13323.500331] GPR20: 0000000000000000 0000000000000000 0000000000000000
0000000000000000
[13323.500331] GPR24: 0000000000000000 0000000000000000 c0000000671767a0
c008000006790118
[13323.500331] GPR28: c000000002bca9b8 c000000002fdaae8 0000000000000000
0000000000000000
[13323.500376] NIP [c000000000882d40] unregister_blkdev+0x1e8/0x2b0
[13323.500381] LR [c000000000882bc0] unregister_blkdev+0x68/0x2b0
[13323.500386] Call Trace:
[13323.500388] [c00000006ff0fb50] [c000000000882bb0]
unregister_blkdev+0x58/0x2b0 (unreliable)
[13323.500395] [c00000006ff0fba0] [c008000006691058]
sys_tcase+0x804/0x938 [ltp_block_dev]
[13323.500401] [c00000006ff0fc80] [c000000000ac2454]
dev_attr_store+0x34/0x50
[13323.500408] [c00000006ff0fca0] [c000000000737d6c]
sysfs_kf_write+0x78/0x8c
[13323.500413] [c00000006ff0fcc0] [c0000000007367cc]
kernfs_fop_write_iter+0x1b4/0x2a4
[13323.500419] [c00000006ff0fd10] [c000000000628d28] vfs_write+0x38c/0x488
[13323.500424] [c00000006ff0fdc0] [c000000000629158] ksys_write+0x84/0x140
[13323.500429] [c00000006ff0fe10] [c0000000000332f8]
system_call_exception+0x138/0x330
[13323.500436] [c00000006ff0fe50] [c00000000000d05c]
system_call_vectored_common+0x15c/0x2ec
[13323.500442] --- interrupt: 3000 at 0x7fff92933e74
[13323.500446] NIP: 00007fff92933e74 LR: 00007fff92933e74 CTR:
0000000000000000
[13323.500450] REGS: c00000006ff0fe80 TRAP: 3000 Tainted: G M O
K (6.15.0-rc3-gbc3372351d0c)
[13323.500455] MSR: 800000000280f033
<SF,VEC,VSX,EE,PR,FP,ME,IR,DR,RI,LE> CR: 44002424 XER: 00000000
[13323.500466] IRQMASK: 0
[13323.500466] GPR00: 0000000000000004 00007fffd5bca940 0000000010067f00
0000000000000003
[13323.500466] GPR04: 0000000030a90b50 0000000000000001 0000000000000000
0000000000000001
[13323.500466] GPR08: 0000000000000000 0000000000000000 0000000000000000
0000000000000000
[13323.500466] GPR12: 0000000000000000 00007fff92c5a5c0 0000000000000000
00000000100332d0
[13323.500466] GPR16: 0000000010033608 0000000010033ce4 0000000010033ce8
0000000010033b60
[13323.500466] GPR20: 0000000000000001 0000000000000000 0000000000000000
0000000000000000
[13323.500466] GPR24: 0000000010060848 00000000100307b0 0000000030a90b50
0000000000000001
[13323.500466] GPR28: 0000000000000001 0000000030a902a0 0000000030a90b50
0000000000000001
[13323.500508] NIP [00007fff92933e74] 0x7fff92933e74
[13323.500512] LR [00007fff92933e74] 0x7fff92933e74
[13323.500515] --- interrupt: 3000
[13323.500517] Code: 7d404c28 39200000 7d094bf8 7d0753f8 7d293b39
408200cc 389b0040 38630040 48851ecd 60000000 48000084 60000000
<0fe00000> a14d0c82 3be00000 7da96b78
[13323.500531] ---[ end trace 0000000000000000 ]---
[13323.500535] ltp_block_dev: Test Case Result: PASS
If you happen to fix this, please add below tag.
Reported-by: Venkat Rao Bagalkote <venkat88@...ux.ibm.com>
Regards,
Venkat.
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