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SubjectRe: BUG: unable to handle kernel NULL pointer dereference in handle_external_interrupt_irqoff
From
syzbot has found a reproducer for the following crash on:

HEAD commit: b74b991f Merge tag 'block-5.6-20200320' of git://git.kerne..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=13059373e00000
kernel config: https://syzkaller.appspot.com/x/.config?x=6dfa02302d6db985
dashboard link: https://syzkaller.appspot.com/bug?extid=3f29ca2efb056a761e38
compiler: clang version 10.0.0 (https://github.com/llvm/llvm-project/ c2443155a0fb245c8f17f2c1c72b6ea391e86e81)
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1199c0c5e00000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=15097373e00000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+3f29ca2efb056a761e38@syzkaller.appspotmail.com

BUG: kernel NULL pointer dereference, address: 0000000000000086
#PF: supervisor instruction fetch in kernel mode
#PF: error_code(0x0010) - not-present page
PGD 9330b067 P4D 9330b067 PUD 9e66f067 PMD 0
Oops: 0010 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 8439 Comm: syz-executor724 Not tainted 5.6.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:0x86
Code: Bad RIP value.
RSP: 0018:ffffc900022e7998 EFLAGS: 00010086
RAX: ffffc900022e79c8 RBX: fffffe0000000000 RCX: ffff88809dcf2500
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: 0000000000000ec0 R08: ffffffff83987523 R09: ffffffff811c7eca
R10: ffff88809dcf2500 R11: 0000000000000002 R12: dffffc0000000000
R13: fffffe0000000ec8 R14: ffffffff880016f0 R15: fffffe0000000ecb
FS: 0000000001d0d880(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000000005c CR3: 00000000978c3000 CR4: 00000000001426e0
Call Trace:
handle_external_interrupt_irqoff+0x154/0x280 arch/x86/kvm/vmx/vmx.c:6274
kvm_before_interrupt arch/x86/kvm/x86.h:343 [inline]
handle_external_interrupt_irqoff+0x132/0x280 arch/x86/kvm/vmx/vmx.c:6272
__irqentry_text_start+0x8/0x8
vcpu_enter_guest+0x6c77/0x9290 arch/x86/kvm/x86.c:8405
save_stack mm/kasan/common.c:72 [inline]
set_track mm/kasan/common.c:80 [inline]
kasan_set_free_info mm/kasan/common.c:337 [inline]
__kasan_slab_free+0x12e/0x1e0 mm/kasan/common.c:476
__cache_free mm/slab.c:3426 [inline]
kfree+0x10a/0x220 mm/slab.c:3757
tomoyo_path_number_perm+0x525/0x690 security/tomoyo/file.c:736
security_file_ioctl+0x55/0xb0 security/security.c:1441
entry_SYSCALL_64_after_hwframe+0x49/0xbe
__lock_acquire+0xc5a/0x1bc0 kernel/locking/lockdep.c:3954
paravirt_write_msr arch/x86/include/asm/paravirt.h:167 [inline]
wrmsrl arch/x86/include/asm/paravirt.h:200 [inline]
native_x2apic_icr_write arch/x86/include/asm/apic.h:249 [inline]
__x2apic_send_IPI_dest arch/x86/kernel/apic/x2apic_phys.c:112 [inline]
x2apic_send_IPI+0x96/0xc0 arch/x86/kernel/apic/x2apic_phys.c:41
test_bit include/asm-generic/bitops/instrumented-non-atomic.h:110 [inline]
hlock_class kernel/locking/lockdep.c:163 [inline]
mark_lock+0x107/0x1650 kernel/locking/lockdep.c:3642
lock_acquire+0x154/0x250 kernel/locking/lockdep.c:4484
rcu_lock_acquire+0x9/0x30 include/linux/rcupdate.h:208
vcpu_run+0x3a3/0xd50 arch/x86/kvm/x86.c:8513
kvm_arch_vcpu_ioctl_run+0x419/0x880 arch/x86/kvm/x86.c:8735
kvm_vcpu_ioctl+0x67c/0xa80 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2932
lock_is_held include/linux/lockdep.h:361 [inline]
rcu_read_lock_sched_held+0x106/0x170 kernel/rcu/update.c:121
kvm_vm_release+0x50/0x50 arch/x86/kvm/../../../virt/kvm/kvm_main.c:858
vfs_ioctl fs/ioctl.c:47 [inline]
ksys_ioctl fs/ioctl.c:763 [inline]
__do_sys_ioctl fs/ioctl.c:772 [inline]
__se_sys_ioctl+0xf9/0x160 fs/ioctl.c:770
do_syscall_64+0xf3/0x1b0 arch/x86/entry/common.c:294
entry_SYSCALL_64_after_hwframe+0x49/0xbe
Modules linked in:
CR2: 0000000000000086
---[ end trace 480d6b60d5a9226d ]---
RIP: 0010:0x86
Code: Bad RIP value.
RSP: 0018:ffffc900022e7998 EFLAGS: 00010086
RAX: ffffc900022e79c8 RBX: fffffe0000000000 RCX: ffff88809dcf2500
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: 0000000000000ec0 R08: ffffffff83987523 R09: ffffffff811c7eca
R10: ffff88809dcf2500 R11: 0000000000000002 R12: dffffc0000000000
R13: fffffe0000000ec8 R14: ffffffff880016f0 R15: fffffe0000000ecb
FS: 0000000001d0d880(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000000005c CR3: 00000000978c3000 CR4: 00000000001426e0

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