linux-kernel - [linux][5.19.0][SRIOV/HNV] WARNING: CPU: 3 PID: 3873 at arch/powerpc/kernel/iommu.c:830 iommu_tce_table

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Date:   Wed, 17 Aug 2022 14:00:27 +0530
From:   Tasmiya Nalatwad <tasmiya@...ux.vnet.ibm.com>
To:     aik@...abs.ru, mpe@...erman.id.au, linux-kernel@...r.kernel.org
Cc:     abdhalee@...ux.vnet.ibm.com, mputtash@...ux.vnet.com,
        sachinp@...ux.vnet.com
Subject: [linux][5.19.0][SRIOV/HNV] WARNING: CPU: 3 PID: 3873 at
 arch/powerpc/kernel/iommu.c:830 iommu_tce_table_put+0x20/0x170

Greetings,

[linux][5.19.0][SRIOV/HNV] WARNING: CPU: 3 PID: 3873 at 
arch/powerpc/kernel/iommu.c:830 iommu_tce_table_put+0x20/0x170

Continuous WARN_ONs are seen when SRIOV device remove operation is 
performed after adding the SRIOV device

--- Call Traces ---
[  645.034242] ------------[ cut here ]------------
[  645.034247] WARNING: CPU: 3 PID: 3873 at 
arch/powerpc/kernel/iommu.c:830 iommu_tce_table_put+0x20/0x170
[  645.034258] Modules linked in: rpcrdma sunrpc rdma_ucm ib_srpt 
ib_isert iscsi_target_mod target_core_mod ib_iser ib_umad rdma_cm 
ib_ipoib iw_cm libiscsi ib_cm scsi_transport_iscsi mlx5_ib ib_uverbs 
ib_core mlx5_core mlxfw psample ptp pps_core rpadlpar_io rpaphp tcp_diag 
udp_diag inet_diag unix_diag af_packet_diag netlink_diag bonding rfkill 
xts vmx_crypto pseries_rng sch_fq_codel binfmt_misc ip_tables ext4 
mbcache jbd2 dm_service_time sd_mod t10_pi crc64_rocksoft crc64 sg 
ibmvfc scsi_transport_fc ibmveth dm_multipath dm_mirror dm_region_hash 
dm_log dm_mod fuse
[  645.034301] CPU: 3 PID: 3873 Comm: drmgr Not tainted 
5.19.0-autotest-geb555cb5b794 #1
[  645.034305] NIP:  c000000000062380 LR: c0000000000fd9e8 CTR: 
c000000000060720
[  645.034307] REGS: c000000053d87790 TRAP: 0700   Not tainted 
(5.19.0-autotest-geb555cb5b794)
[  645.034311] MSR:  8000000000029033 <SF,EE,ME,IR,DR,RI,LE>  CR: 
24002244  XER: 20040000
[  645.034320] CFAR: c0000000000fd9e4 IRQMASK: 0
[  645.034320] GPR00: c0000000000fd9e8 c000000053d87a30 c000000002a10700 
0000000000000000
[  645.034320] GPR04: c00c000000036ac0 c00000000dab0830 c00000000dab0830 
0000000000000001
[  645.034320] GPR08: 027ffff000000201 0000000000000001 0000000000000001 
fffffffffffffffd
[  645.034320] GPR12: 0000000000002000 c00000077fff8e80 0000000000000000 
0000000000000000
[  645.034320] GPR16: 0000000000000000 0000000000000000 0000000000000000 
0000000000000000
[  645.034320] GPR20: 0000000000000000 0000000136dc20f8 0000000136dbee08 
0000000000000006
[  645.034320] GPR24: 0000000000000000 00000001749423fd c000000002970418 
c000000053d87b50
[  645.034320] GPR28: 0000000000000002 0000000000000000 c000000009781500 
c000000054f1a2c0
[  645.034363] NIP [c000000000062380] iommu_tce_table_put+0x20/0x170
[  645.034366] LR [c0000000000fd9e8] iommu_reconfig_notifier+0x98/0x220
[  645.034370] Call Trace:
[  645.034372] [c000000053d87a30] [c0000000659eec00] 0xc0000000659eec00 
(unreliable)
[  645.034376] [c000000053d87aa0] [c0000000000fd9d4] 
iommu_reconfig_notifier+0x84/0x220
[  645.034381] [c000000053d87ae0] [c00000000018e174] 
blocking_notifier_call_chain+0xa4/0x110
[  645.034385] [c000000053d87b30] [c000000000a76f6c] 
of_detach_node+0xbc/0x100
[  645.034389] [c000000053d87b90] [c0000000000f9fc8] ofdt_write+0x898/0x1050
[  645.034393] [c000000053d87c60] [c0000000005656dc] 
proc_reg_write+0x10c/0x1b0
[  645.034398] [c000000053d87c90] [c000000000493cc4] vfs_write+0x104/0x460
[  645.034402] [c000000053d87d50] [c0000000004941fc] ksys_write+0x7c/0x140
[  645.034406] [c000000053d87da0] [c000000000033b88] 
system_call_exception+0x198/0x430
[  645.034410] [c000000053d87e10] [c00000000000c63c] 
system_call_common+0xec/0x250
[  645.034414] --- interrupt: c00 at 0x20002a31bd74
[  645.034417] NIP:  000020002a31bd74 LR: 0000000136da3804 CTR: 
0000000000000000
[  645.034419] REGS: c000000053d87e80 TRAP: 0c00   Not tainted 
(5.19.0-autotest-geb555cb5b794)
[  645.034423] MSR:  800000000200d033 <SF,VEC,EE,PR,ME,IR,DR,RI,LE>  CR: 
24002402  XER: 00000000
[  645.034430] IRQMASK: 0
[  645.034430] GPR00: 0000000000000004 00007ffff4a44ec0 000020002a417100 
0000000000000006
[  645.034430] GPR04: 00007ffff4a44f68 0000000000000020 0000000000000000 
00000001749423fd
[  645.034430] GPR08: 0000000000000000 0000000000000000 0000000000000000 
0000000000000000
[  645.034430] GPR12: 0000000000000000 0000200029f5b520 0000000000000000 
0000000000000000
[  645.034430] GPR16: 0000000000000000 0000000000000000 0000000000000000 
0000000000000000
[  645.034430] GPR20: 0000000000000000 0000000136dc20f8 0000000136dbee08 
0000000136dbcfd0
[  645.034430] GPR24: 0000000136dc1dc8 0000000136dc20c8 0000000136dbcfd0 
0000000136dbd038
[  645.034430] GPR28: 0000000000000020 0000000000000006 00000001749423d8 
00007ffff4a44f68
[  645.034463] NIP [000020002a31bd74] 0x20002a31bd74
[  645.034465] LR [0000000136da3804] 0x136da3804
[  645.034467] --- interrupt: c00
[  645.034469] Instruction dump:
[  645.034471] 4e800020 60000000 60000000 60000000 3c4c029b 3842e3a0 
7c0802a6 60000000
[  645.034477] 7c690074 fbc1fff0 f821ff91 7929d182 <0b090000> fbe10068 
7c7f1b78 38630330
[  645.034483] ---[ end trace 0000000000000000 ]---

-- 
Regards,
Tasmiya Nalatwad
IBM Linux Technology Center