Abdul Haleem <abdhalee@xxxxxxxxxxxxxxxxxx> writes: > Greeting's > > Kernel Oops is seen on 4.17.0-rc7-next-20180601 kernel on a bare-metal > machine when running lvm snapshot tests on nvme disks. > > Machine Type: Power 8 bare-metal > kernel : 4.17.0-rc7-next-20180601 > test: > $ pvcreate -y /dev/nvme0n1 > $ vgcreate avocado_vg /dev/nvme0n1 > $ lvcreate --size 1.4T --name avocado_lv avocado_vg -y > $ mkfs.ext2 /dev/avocado_vg/avocado_lv > $ lvcreate --size 1G --snapshot --name avocado_sn /dev/avocado_vg/avocado_lv -y > $ lvconvert --merge /dev/avocado_vg/avocado_sn > the last command results in Oops: > > Unable to handle kernel paging request for data at address 0x000000d0 > Faulting instruction address: 0xc0000000002dced4 > Oops: Kernel access of bad area, sig: 11 [#1] > LE SMP NR_CPUS=2048 NUMA PowerNV > Dumping ftrace buffer: > (ftrace buffer empty) > Modules linked in: dm_snapshot dm_bufio nvme bnx2x iptable_mangle > ipt_MASQUERADE iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 > nf_defrag_ipv4 xt_conntrack nf_conntrack ipt_REJECT nf_reject_ipv4 > xt_tcpudp tun bridge stp llc iptable_filter dm_mirror dm_region_hash > dm_log dm_service_time vmx_crypto powernv_rng rng_core dm_multipath > kvm_hv binfmt_misc kvm nfsd ip_tables x_tables autofs4 xfs lpfc > crc_t10dif crct10dif_generic mdio nvme_fc libcrc32c nvme_fabrics > nvme_core crct10dif_common [last unloaded: nvme] > CPU: 70 PID: 157763 Comm: lvconvert Not tainted 4.17.0-rc7-next-20180601-autotest-autotest #1 > NIP: c0000000002dced4 LR: c000000000244d14 CTR: c000000000244cf0 > REGS: c000001f81d6b5a0 TRAP: 0300 Not tainted (4.17.0-rc7-next-20180601-autotest-autotest) > MSR: 900000010280b033 <SF,HV,VEC,VSX,EE,FP,ME,IR,DR,RI,LE,TM[E]> CR: 22442444 XER: 20000000 > CFAR: c000000000008934 DAR: 00000000000000d0 DSISR: 40000000 SOFTE: 0 > GPR00: c000000000244d14 c000001f81d6b820 c00000000109c400 c000003c9d080180 > GPR04: 0000000000000001 c000001fad510000 c000001fad510000 0000000000000001 > GPR08: 0000000000000000 f000000000000000 f000000000000008 0000000000000000 > GPR12: c000000000244cf0 c000001ffffc4f80 00007fffa0e31090 00007fffd9d9b470 > GPR16: 0000000000000000 000000000000005c 00007fffa0e3a5b0 00007fffa0e62040 > GPR20: 0000010014ad7d50 0000010014ad7d20 00007fffa0e64210 0000000000000001 > GPR24: 0000000000000000 c00000000081bae0 c000001ed2461b00 d00000000f859d08 > GPR28: c000003c9d080180 c000000000244d14 0000000000000001 0000000000000000 > NIP [c0000000002dced4] kmem_cache_free+0x1a4/0x2b0 > LR [c000000000244d14] mempool_free_slab+0x24/0x40 Are you running with slub debugging enabled? Try booting with slub_debug=FZP cheers
