While running selftest kvm set_memory_region_test on x86_64 linux-next kernel 5.7.0-rc6-next-20200518 the kernel BUG noticed.

steps to reproduce: (always reproducible ) ------------------------- cd /opt/kselftests/default-in-kernel/kvm ./set_memory_region_test

BAD: next-20200518 (still reproducible on next-20200526) GOOD: next-20200515 git tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git kernel config: http://snapshots.linaro.org/openembedded/lkft/lkft/sumo/intel-corei7-64/lkft...

kernel crash log, ----------------------- [ 33.074161] ------------[ cut here ]------------ [ 33.079845] kernel BUG at /usr/src/kernel/arch/x86/kvm/mmu/mmu.c:3722! [ 33.086422] invalid opcode: 0000 [#1] SMP PTI [ 33.090792] CPU: 3 PID: 512 Comm: set_memory_regi Not tainted 5.7.0-rc7-next-20200526 #1 [ 33.100253] Hardware name: Supermicro SYS-5019S-ML/X11SSH-F, BIOS 2.2 05/23/2018 [ 33.107642] RIP: 0010:kvm_mmu_load+0x407/0x420 [ 33.112086] Code: ff e9 42 fc ff ff 48 8b 0d f6 ec 99 01 e9 31 ff ff ff 48 8b 0d ea ec 99 01 e9 ac fe ff ff 48 8b 0d de ec 99 01 e9 af fd ff ff <0f> 0b 48 8b 0d d0 ec 99 01 eb 90 0f 1f 40 00 66 2e 0f 1f 84 00 00 [ 33.130829] RSP: 0018:ffffb225803d7d20 EFLAGS: 00010293 [ 33.136047] RAX: ffff936ee4fd8420 RBX: ffff936ee4fd8000 RCX: 0000000000000000 [ 33.143171] RDX: 0000000000000027 RSI: ffffffffacc81b20 RDI: ffff936ee76fb9a8 [ 33.150294] RBP: ffffb225803d7d50 R08: ffff936eefbb66c0 R09: ffff936eec668800 [ 33.157418] R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000000 [ 33.164567] R13: 00000000002dc6c0 R14: ffff936ee4fd8000 R15: 0000000000000001 [ 33.171710] FS: 00007fce5aed3740(0000) GS:ffff936eefb80000(0000) knlGS:0000000000000000 [ 33.179787] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 33.185525] CR2: 0000000000fdd298 CR3: 0000000263c74004 CR4: 00000000003626e0 [ 33.192682] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 33.199806] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 33.206930] Call Trace: [ 33.209377] vcpu_enter_guest+0x10d0/0x17f0 [ 33.213580] ? kvm_load_guest_fpu.isra.131+0x4d/0x140 [ 33.218632] kvm_arch_vcpu_ioctl_run+0x12a/0x650 [ 33.223250] ? kvm_arch_vcpu_ioctl_run+0x12a/0x650 [ 33.228036] kvm_vcpu_ioctl+0x261/0x680 [ 33.231872] ? __audit_syscall_entry+0xdd/0x130 [ 33.236400] ksys_ioctl+0x98/0xb0 [ 33.239715] ? do_syscall_64+0x20/0xa0 [ 33.243461] __x64_sys_ioctl+0x1a/0x20 [ 33.247212] do_syscall_64+0x5a/0xa0 [ 33.250785] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 33.255836] RIP: 0033:0x7fce5a7d18f7 [ 33.259415] Code: b3 66 90 48 8b 05 a1 35 2c 00 64 c7 00 26 00 00 00 48 c7 c0 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 b8 10 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 71 35 2c 00 f7 d8 64 89 01 48 [ 33.278152] RSP: 002b:00007ffca3313c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 33.285708] RAX: ffffffffffffffda RBX: 0000000000fdd3e0 RCX: 00007fce5a7d18f7 [ 33.292831] RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000005 [ 33.299954] RBP: 0000000000000000 R08: 0000000000409dc3 R09: 0000000000000000 [ 33.307078] R10: 0000000000000001 R11: 0000000000000246 R12: 00000000004018a0 [ 33.314204] R13: 00007ffca3313e80 R14: 00007fce5aed36c0 R15: 0000000000000000 [ 33.321331] Modules linked in: x86_pkg_temp_thermal fuse [ 33.326672] ---[ end trace 76d29d87896dd85b ]--- [ 33.331308] RIP: 0010:kvm_mmu_load+0x407/0x420 [ 33.335753] Code: ff e9 42 fc ff ff 48 8b 0d f6 ec 99 01 e9 31 ff ff ff 48 8b 0d ea ec 99 01 e9 ac fe ff ff 48 8b 0d de ec 99 01 e9 af fd ff ff <0f> 0b 48 8b 0d d0 ec 99 01 eb 90 0f 1f 40 00 66 2e 0f 1f 84 00 00 [ 33.354497] RSP: 0018:ffffb225803d7d20 EFLAGS: 00010293 [ 33.359749] RAX: ffff936ee4fd8420 RBX: ffff936ee4fd8000 RCX: 0000000000000000 [ 33.366882] RDX: 0000000000000027 RSI: ffffffffacc81b20 RDI: ffff936ee76fb9a8 [ 33.374015] RBP: ffffb225803d7d50 R08: ffff936eefbb66c0 R09: ffff936eec668800 [ 33.381145] R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000000 [ 33.388278] R13: 00000000002dc6c0 R14: ffff936ee4fd8000 R15: 0000000000000001 [ 33.395412] FS: 00007fce5aed3740(0000) GS:ffff936eefb80000(0000) knlGS:0000000000000000 [ 33.403496] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 33.409242] CR2: 0000000000fdd298 CR3: 0000000263c74004 CR4: 00000000003626e0 [ 33.416374] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 33.423509] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 t_memory_region_[ 33.431191] general protection fault, probably for non-canonical address 0xdead000000000100: 0000 [#2] SMP PTI [ 33.442078] CPU: 1 PID: 512 Comm: set_memory_regi Tainted: G D 5.7.0-rc7-next-20200526 #1 [ 33.451541] Hardware name: Supermicro SYS-5019S-ML/X11SSH-F, BIOS 2.2 05/23/2018 [ 33.458927] RIP: 0010:__schedule+0x48b/0x830 [ 33.463197] Code: 84 be fd ff ff 48 01 83 68 0c 00 00 48 83 83 60 0c 00 00 01 e9 aa fd ff ff 4d 8b bc 24 50 03 00 00 4d 85 ff 0f 84 c3 fd ff ff <49> 8b 47 10 4c 89 ff 4c 89 f6 48 8b 40 08 e8 f2 83 21 00 4d 8b 3f [ 33.481933] RSP: 0018:ffffb225803d7bf8 EFLAGS: 00010086 [ 33.487151] RAX: 0000000000000000 RBX: ffff936eefaacc00 RCX: 0000000000000002 [ 33.494276] RDX: 0000006500000000 RSI: 0000000000000000 RDI: ffff936ee4fd8000 [ 33.501398] RBP: ffffb225803d7c50 R08: 0000000000000000 R09: 0000000000000001 [ 33.508523] R10: ffffb225803d7b80 R11: 0000000000000197 R12: ffff936ee76fb100 [ 33.515646] R13: ffff936eefaacc18 R14: ffff936eee1d1880 R15: dead000000000100 [ 33.522771] FS: 00007fce5aed3740(0000) GS:ffff936eefa80000(0000) knlGS:0000000000000000 [ 33.530848] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 33.536586] CR2: 000055c5745b6280 CR3: 0000000207c10006 CR4: 00000000003626e0 [ 33.543710] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 33.550832] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 33.557957] Call Trace: [ 33.560406] preempt_schedule_common+0x15/0x30 [ 33.564849] _cond_resched+0x22/0x30 [ 33.568426] wait_for_completion+0x42/0x120 [ 33.572605] __synchronize_srcu+0xef/0x180 [ 33.576704] ? __bpf_trace_rcu_invoke_callback+0x10/0x10 [ 33.582017] synchronize_srcu+0x66/0x110 [ 33.585941] ? synchronize_srcu+0x66/0x110 [ 33.590031] kvm_page_track_unregister_notifier+0x4f/0x60 [ 33.595423] kvm_mmu_uninit_vm+0x15/0x20 [ 33.599340] kvm_arch_destroy_vm+0x1ab/0x210 [ 33.603604] kvm_put_kvm+0x1c6/0x3d0 [ 33.607176] kvm_vm_release+0x21/0x30 [ 33.610840] __fput+0x109/0x270 [ 33.613979] ____fput+0xe/0x10 [ 33.617037] task_work_run+0x6f/0xc0 [ 33.620609] do_exit+0x3ec/0xd10 [ 33.623842] rewind_stack_do_exit+0x17/0x17 [ 33.628024] RIP: 0033:0x7fce5a7d18f7 [ 33.631597] Code: Bad RIP value. [ 33.634821] RSP: 002b:00007ffca3313c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 33.642387] RAX: ffffffffffffffda RBX: 0000000000fdd3e0 RCX: 00007fce5a7d18f7 [ 33.649511] RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000005 [ 33.656634] RBP: 0000000000000000 R08: 0000000000409dc3 R09: 0000000000000000 [ 33.663757] R10: 0000000000000001 R11: 0000000000000246 R12: 00000000004018a0 [ 33.670882] R13: 00007ffca3313e80 R14: 00007fce5aed36c0 R15: 0000000000000000 [ 33.678007] Modules linked in: x86_pkg_temp_thermal fuse [ 33.683320] ---[ end trace 76d29d87896dd85c ]--- [ 33.687937] RIP: 0010:kvm_mmu_load+0x407/0x420 [ 33.692373] Code: ff e9 42 fc ff ff 48 8b 0d f6 ec 99 01 e9 31 ff ff ff 48 8b 0d ea ec 99 01 e9 ac fe ff ff 48 8b 0d de ec 99 01 e9 af fd ff ff <0f> 0b 48 8b 0d d0 ec 99 01 eb 90 0f 1f 40 00 66 2e 0f 1f 84 00 00 [ 33.711111] RSP: 0018:ffffb225803d7d20 EFLAGS: 00010293 [ 33.716329] RAX: ffff936ee4fd8420 RBX: ffff936ee4fd8000 RCX: 0000000000000000 [ 33.723452] RDX: 0000000000000027 RSI: ffffffffacc81b20 RDI: ffff936ee76fb9a8 [ 33.730576] RBP: ffffb225803d7d50 R08: ffff936eefbb66c0 R09: ffff936eec668800 [ 33.737699] R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000000 [ 33.744823] R13: 00000000002dc6c0 R14: ffff936ee4fd8000 R15: 0000000000000001 [ 33.751948] FS: 00007fce5aed3740(0000) GS:ffff936eefa80000(0000) knlGS:0000000000000000 [ 33.760024] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 33.765760] CR2: 00007fce5a7d18cd CR3: 0000000207c10006 CR4: 00000000003626e0 [ 33.772885] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 33.780009] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 33.787132] note: set_memory_regi[512] exited with preempt_count 2 [ 33.793304] Fixing recursive fault but reboot is needed!

Test job link, https://lkft.validation.linaro.org/scheduler/job/1455528#L1230