Hi, Memory hot-unplug on PowerVM LPAR running next-20170911 results in Faulting instruction address: 0xc0000000002b56c4 which maps to the below code path: 0xc0000000002b56c4 is in __rmqueue (./include/linux/list.h:104). 99 * This is only for internal list manipulation where we know 100 * the prev/next entries already! 101 */ 102 static inline void __list_del(struct list_head * prev, struct list_head * next) 103 { 104 next->prev = prev; 105 WRITE_ONCE(prev->next, next); 106 } 107 108 /** Machine Type: Power 8 PowerVM LPAR Kernel version: 4.13.0-next-20170911 config file : attached dmesg logs --------- Unable to handle kernel paging request for data at address 0x5deadbeef0000108 Faulting instruction address: 0xc0000000002b56c4 Oops: Kernel access of bad area, sig: 11 [#1] LE SMP NR_CPUS=2048 NUMA pSeries Modules linked in: xt_addrtype xt_conntrack ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 iptable_filter ip_tables x_tables nf_nat nf_conntrack bridge stp llc dm_thin_pool dm_persistent_data dm_bio_prison dm_bufio libcrc32c rtc_generic vmx_crypto pseries_rng autofs4 CPU: 5 PID: 846 Comm: avocado Not tainted 4.13.0-next-20170911 #1 task: c000000771c02e00 task.stack: c000000771c88000 NIP: c0000000002b56c4 LR: c0000000002b7738 CTR: c0000000003587b0 REGS: c000000771c8b2c0 TRAP: 0380 Not tainted (4.13.0-next-20170911) MSR: 800000010280b033 CR: 84228828 XER: 20000000 CFAR: c0000000002b7734 SOFTE: 0 GPR00: c0000000002b7738 c000000771c8b540 c000000001598a00 0000000000000000 GPR04: f000000001d2cce0 0000000000000001 5deadbeef0000100 5deadbeef0000200 GPR08: 5deadbee00000000 c00000077ff54710 0000000000000000 0000000000000060 GPR12: 0000000024242824 c00000000e743480 000000077eb90000 c00000077fc68978 GPR16: c00000077ff54600 0000000040000000 0000000000000000 0000000020000000 GPR20: 0000000000000002 c00000077fc68998 c0000000010d8978 0000000000000000 GPR24: 0000000000000001 0000000000000040 c00000077ff54600 f000000001d2ccc0 GPR28: 0000000000000010 0000000000000000 0000000000000001 0000000000000000 NIP [c0000000002b56c4] __rmqueue+0xd4/0x680 LR [c0000000002b7738] get_page_from_freelist+0x798/0xe30 Call Trace: [c000000771c8b540] [c000000771c8b570] 0xc000000771c8b570 (unreliable) [c000000771c8b5f0] [c0000000002b7738] get_page_from_freelist+0x798/0xe30 [c000000771c8b700] [c0000000002b868c] __alloc_pages_nodemask +0x23c/0x1120 [c000000771c8b8f0] [c000000000358924] new_node_page+0x174/0x200 [c000000771c8b950] [c00000000035f230] migrate_pages+0x2d0/0x1160 [c000000771c8ba30] [c00000000035b2a4] __offline_pages.constprop.6 +0x8c4/0xa80 [c000000771c8bb70] [c0000000007e2288] memory_subsys_offline+0xa8/0x110 [c000000771c8bba0] [c0000000007b4414] device_offline+0x104/0x140 [c000000771c8bbe0] [c0000000007e207c] store_mem_state+0x17c/0x190 [c000000771c8bc20] [c0000000007aea68] dev_attr_store+0x68/0xa0 [c000000771c8bc60] [c0000000004576e0] sysfs_kf_write+0x80/0xb0 [c000000771c8bca0] [c0000000004563ec] kernfs_fop_write+0x17c/0x250 [c000000771c8bcf0] [c00000000039183c] __vfs_write+0x6c/0x230 [c000000771c8bd90] [c000000000391c50] vfs_write+0xd0/0x270 [c000000771c8bde0] [c000000000391fec] SyS_write+0x6c/0x110 [c000000771c8be30] [c00000000000b184] system_call+0x58/0x6c Instruction dump: 39290100 7c9a482a 7d3a4a14 7fa92040 3764ffe0 419e01d8 41c201d4 3d005dea e8e40008 e8c40000 6108dbee 790807c6 6508f000 f8c70000 7d094378 ---[ end trace bb48ce522c150b9a ]--- INFO: rcu_sched detected stalls on CPUs/tasks: 2-...: (1 GPs behind) idle=80a/140000000000000/0 softirq=1760/1761 fqs=281 (detected by 13, t=5280 jiffies, g=3469, c=3468, q=4) Regard's Abdul Haleem IBM Linux Technology Center.