On Wed, 16 May 2018 11:49:42 +0100 Dave Martin <Dave.Martin@xxxxxxx> wrote: Hi Dave, > Hi Marc, > > This is a trivial update to the previously posted v7 [1]. The only > changes are a couple of minor cosmetic changes requested by reviewers, > on-list and the addition of Acked-by/Reviewed-by tags received since the > series was posted. > > Let me know if you need anything else on this. So I've taken this, merged in Linus' top of tree, started a guest on a dual A53 board, and immediately hit the following: root@sy-borg:~# [ 287.226184] Unable to handle kernel NULL pointer dereference at virtual address 00000000 [ 287.231672] Mem abort info: [ 287.234537] ESR = 0x96000044 [ 287.237674] Exception class = DABT (current EL), IL = 32 bits [ 287.243765] SET = 0, FnV = 0 [ 287.246900] EA = 0, S1PTW = 0 [ 287.250126] Data abort info: [ 287.253083] ISV = 0, ISS = 0x00000044 [ 287.257025] CM = 0, WnR = 1 [ 287.260076] user pgtable: 4k pages, 48-bit VAs, pgdp = 00000000b8483f75 [ 287.266882] [0000000000000000] pgd=0000000000000000 [ 287.271903] Internal error: Oops: 96000044 [#1] PREEMPT SMP [ 287.277636] Modules linked in: [ 287.280776] CPU: 1 PID: 3098 Comm: kworker/u4:3 Not tainted 4.17.0-rc5-00166-gd84e81cca249 #136 [ 287.289730] Hardware name: Globalscale Marvell ESPRESSOBin Board (DT) [ 287.296364] pstate: 40000085 (nZcv daIf -PAN -UAO) [ 287.301301] pc : fpsimd_save_state+0x0/0x54 [ 287.305595] lr : fpsimd_save+0x50/0x100 [ 287.309531] sp : ffff00000dde3af0 [ 287.312936] x29: ffff00000dde3af0 x28: ffff000008cd565c [ 287.318401] x27: ffff800078ee9c80 x26: ffff80007b207628 [ 287.323867] x25: ffff0000093f9000 x24: 0000000000000001 [ 287.329333] x23: ffff0000093d4000 x22: ffff80007b207000 [ 287.334798] x21: ffff80007efd7d80 x20: ffff80007b207000 [ 287.340264] x19: 0000000000000000 x18: 0000000000040f0b [ 287.345729] x17: 0000ffffb70752b8 x16: 0000ffffb708e008 [ 287.351195] x15: 0000000000000000 x14: 0000000000000400 [ 287.356661] x13: 0000000000000001 x12: 0000000000000001 [ 287.362127] x11: 0000000000000001 x10: 0000000000000000 [ 287.367592] x9 : 0000000000000253 x8 : ffff80007b207200 [ 287.373057] x7 : ffff80007b207100 x6 : ffff80007c378f18 [ 287.378523] x5 : 00000042c2094c00 x4 : 0000000000000000 [ 287.383990] x3 : 00000042e0033450 x2 : 0000000000000000 [ 287.389454] x1 : 0000800075bf6000 x0 : 0000000000000000 [ 287.394922] Process kworker/u4:3 (pid: 3098, stack limit = 0x00000000ca0dd8c6) [ 287.402358] Call trace: [ 287.404873] fpsimd_save_state+0x0/0x54 [ 287.408813] fpsimd_thread_switch+0x28/0xa0 [ 287.413114] __switch_to+0x1c/0xd0 [ 287.416609] __schedule+0x1b8/0x730 [ 287.420191] preempt_schedule_common+0x24/0x48 [ 287.424760] preempt_schedule.part.23+0x1c/0x28 [ 287.429419] preempt_schedule+0x1c/0x28 [ 287.433363] _raw_spin_unlock+0x34/0x48 [ 287.437308] flush_old_exec+0x45c/0x6a0 [ 287.441250] load_elf_binary+0x324/0x1198 [ 287.445372] search_binary_handler+0xac/0x230 [ 287.449851] do_execveat_common.isra.14+0x508/0x6e0 [ 287.454867] do_execve+0x28/0x30 [ 287.458185] call_usermodehelper_exec_async+0xdc/0x140 [ 287.463468] ret_from_fork+0x10/0x18 [ 287.467143] Code: a9425bf5 a8c37bfd d65f03c0 d65f03c0 (ad000400) [ 287.473414] ---[ end trace c4346b99cc877f8e ]--- It happened just after having loaded the guest kernel, so I presume we're missing some kind of initialization. I couldn't subsequently reproduce it on the same machine, and the same kernel is doing absolutely fine on a Seattle box. I can't immediately see how st would be NULL, unless we somehow are missing some state tracking somewhere... Any idea? M. -- Without deviation from the norm, progress is not possible. _______________________________________________ kvmarm mailing list kvmarm@xxxxxxxxxxxxxxxxxxxxx https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
