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SubjectBUG: arch/x86/kvm/mmu/mmu.c:3722: kvm_mmu_load+0x407/0x420
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/linux-next/777/config

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


--
Linaro LKFT
https://lkft.linaro.org

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