Greeting's DLPAR remove operation of SRIOV logical device triggers WARN_ON() on mainline kernel 6.2.0 (first seen on 5.19.0) Regression was introduced by below patch, as WARN_ON is not seen when reverted commit b1fc44eaa9ba31e28c4125d6b9205a3582b47b5d Author: Alexey Kardashevskiy Date: Wed Jun 29 16:06:14 2022 +1000 pseries/iommu/ddw: Fix kdump to work in absence of ibm,dma-window kernel : mainline 6.2.0 Machine: Power 10 PowerVM LPAR test : drmgr -c phb -s "PHB 4432" -r -d 5 (DLPAR remove) kernel config: attached console logs: ------------[ cut here ]------------ WARNING: CPU: 3 PID: 3873 at arch/powerpc/kernel/iommu.c:830 iommu_tce_table_put+0x20/0x170 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 CPU: 3 PID: 3873 Comm: drmgr Not tainted 5.19.0-autotest-geb555cb5b794 #1 NIP: c000000000062380 LR: c0000000000fd9e8 CTR: c000000000060720 REGS: c000000053d87790 TRAP: 0700 Not tainted (5.19.0-autotest-geb555cb5b794) MSR: 8000000000029033 CR: 24002244 XER: 20040000 CFAR: c0000000000fd9e4 IRQMASK: 0 GPR00: c0000000000fd9e8 c000000053d87a30 c000000002a10700 0000000000000000 GPR04: c00c000000036ac0 c00000000dab0830 c00000000dab0830 0000000000000001 GPR08: 027ffff000000201 0000000000000001 0000000000000001 fffffffffffffffd GPR12: 0000000000002000 c00000077fff8e80 0000000000000000 0000000000000000 GPR16: 0000000000000000 0000000000000000 0000000000000000 0000000000000000 GPR20: 0000000000000000 0000000136dc20f8 0000000136dbee08 0000000000000006 GPR24: 0000000000000000 00000001749423fd c000000002970418 c000000053d87b50 GPR28: 0000000000000002 0000000000000000 c000000009781500 c000000054f1a2c0 NIP [c000000000062380] iommu_tce_table_put+0x20/0x170 LR [c0000000000fd9e8] iommu_reconfig_notifier+0x98/0x220 Call Trace: [c000000053d87a30] [c0000000659eec00] 0xc0000000659eec00 (unreliable) [c000000053d87aa0] [c0000000000fd9d4] iommu_reconfig_notifier+0x84/0x220 [c000000053d87ae0] [c00000000018e174] blocking_notifier_call_chain+0xa4/0x110 [c000000053d87b30] [c000000000a76f6c] of_detach_node+0xbc/0x100 [c000000053d87b90] [c0000000000f9fc8] ofdt_write+0x898/0x1050 [c000000053d87c60] [c0000000005656dc] proc_reg_write+0x10c/0x1b0 [c000000053d87c90] [c000000000493cc4] vfs_write+0x104/0x460 [c000000053d87d50] [c0000000004941fc] ksys_write+0x7c/0x140 [c000000053d87da0] [c000000000033b88] system_call_exception+0x198/0x430 [c000000053d87e10] [c00000000000c63c] system_call_common+0xec/0x250 --- interrupt: c00 at 0x20002a31bd74 NIP: 000020002a31bd74 LR: 0000000136da3804 CTR: 0000000000000000 REGS: c000000053d87e80 TRAP: 0c00 Not tainted (5.19.0-autotest-geb555cb5b794) MSR: 800000000200d033 CR: 24002402 XER: 00000000 IRQMASK: 0 GPR00: 0000000000000004 00007ffff4a44ec0 000020002a417100 0000000000000006 GPR04: 00007ffff4a44f68 0000000000000020 0000000000000000 00000001749423fd GPR08: 0000000000000000 0000000000000000 0000000000000000 0000000000000000 GPR12: 0000000000000000 0000200029f5b520 0000000000000000 0000000000000000 GPR16: 0000000000000000 0000000000000000 0000000000000000 0000000000000000 GPR20: 0000000000000000 0000000136dc20f8 0000000136dbee08 0000000136dbcfd0 GPR24: 0000000136dc1dc8 0000000136dc20c8 0000000136dbcfd0 0000000136dbd038 GPR28: 0000000000000020 0000000000000006 00000001749423d8 00007ffff4a44f68 NIP [000020002a31bd74] 0x20002a31bd74 LR [0000000136da3804] 0x136da3804 --- interrupt: c00 Instruction dump: 4e800020 60000000 60000000 60000000 3c4c029b 3842e3a0 7c0802a6 60000000 7c690074 fbc1fff0 f821ff91 7929d182 <0b090000> fbe10068 7c7f1b78 38630330 ---[ end trace 0000000000000000 ]--- -- Regard's Abdul Haleem IBM Linux Technology Center