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SubjectBUG: spinlock bad magic in synchronize_srcu
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Hello,

syzbot found the following issue on:

HEAD commit: b10b8ad8 Add linux-next specific files for 20200921
git tree: linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=11bb1e73900000
kernel config: https://syzkaller.appspot.com/x/.config?x=3cf0782933432b43
dashboard link: https://syzkaller.appspot.com/bug?extid=05017ad275a64a3246f8
compiler: gcc (GCC) 10.1.0-syz 20200507

Unfortunately, I don't have any reproducer for this issue yet.

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+05017ad275a64a3246f8@syzkaller.appspotmail.com

BUG: spinlock bad magic on CPU#1, syz-executor.0/11108
lock: 0xffff8880ae500040, .magic: 00000000, .owner: <none>/-1, .owner_cpu: 0
CPU: 1 PID: 11108 Comm: syz-executor.0 Not tainted 5.9.0-rc5-next-20200921-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x198/0x1fb lib/dump_stack.c:118
debug_spin_lock_before kernel/locking/spinlock_debug.c:83 [inline]
do_raw_spin_lock+0x216/0x2b0 kernel/locking/spinlock_debug.c:112
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:117 [inline]
_raw_spin_lock_irqsave+0x9c/0xd0 kernel/locking/spinlock.c:159
srcu_might_be_idle kernel/rcu/srcutree.c:772 [inline]
synchronize_srcu+0x4f/0x1c0 kernel/rcu/srcutree.c:999
kvm_arch_destroy_vm+0x415/0x570 arch/x86/kvm/x86.c:10049
kvm_create_vm arch/x86/kvm/../../../virt/kvm/kvm_main.c:820 [inline]
kvm_dev_ioctl_create_vm arch/x86/kvm/../../../virt/kvm/kvm_main.c:3914 [inline]
kvm_dev_ioctl+0xf4b/0x13a0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3966
vfs_ioctl fs/ioctl.c:48 [inline]
__do_sys_ioctl fs/ioctl.c:753 [inline]
__se_sys_ioctl fs/ioctl.c:739 [inline]
__x64_sys_ioctl+0x193/0x200 fs/ioctl.c:739
do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45d5f9
Code: 5d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 2b b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fc828d44c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000010d40 RCX: 000000000045d5f9
RDX: 0000000000000000 RSI: 000000000000ae01 RDI: 0000000000000003
RBP: 000000000118cf80 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118cf4c
R13: 00007ffe02e94b2f R14: 00007fc828d459c0 R15: 000000000118cf4c
general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 0 PID: 11108 Comm: syz-executor.0 Not tainted 5.9.0-rc5-next-20200921-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:rcu_segcblist_enqueue+0x90/0xf0 kernel/rcu/rcu_segcblist.c:250
Code: 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 75 4e 48 b8 00 00 00 00 00 fc ff df 48 8b 6b 20 48 89 ea 48 c1 ea 03 <80> 3c 02 00 75 21 48 89 75 00 48 89 73 20 48 83 c4 08 5b 5d c3 48
RSP: 0018:ffffc90008317c08 EFLAGS: 00010046
RAX: dffffc0000000000 RBX: ffff8880ae400080 RCX: ffffffff815be040
RDX: 0000000000000000 RSI: ffffc90008317cf0 RDI: ffff8880ae4000a0
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000003
R10: fffff52001062f73 R11: 6637303030302052 R12: ffffc90008317cf0
R13: 0000000000000000 R14: ffff8880ae400080 R15: ffff8880ae400040
FS: 00007fc828d45700(0000) GS:ffff8880ae400000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000001590004 CR3: 00000000998bd000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
__call_srcu+0x193/0xc50 kernel/rcu/srcutree.c:859
__synchronize_srcu+0x128/0x220 kernel/rcu/srcutree.c:923
kvm_arch_destroy_vm+0x415/0x570 arch/x86/kvm/x86.c:10049
kvm_create_vm arch/x86/kvm/../../../virt/kvm/kvm_main.c:820 [inline]
kvm_dev_ioctl_create_vm arch/x86/kvm/../../../virt/kvm/kvm_main.c:3914 [inline]
kvm_dev_ioctl+0xf4b/0x13a0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3966
vfs_ioctl fs/ioctl.c:48 [inline]
__do_sys_ioctl fs/ioctl.c:753 [inline]
__se_sys_ioctl fs/ioctl.c:739 [inline]
__x64_sys_ioctl+0x193/0x200 fs/ioctl.c:739
do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45d5f9
Code: 5d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 2b b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fc828d44c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000010d40 RCX: 000000000045d5f9
RDX: 0000000000000000 RSI: 000000000000ae01 RDI: 0000000000000003
RBP: 000000000118cf80 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118cf4c
R13: 00007ffe02e94b2f R14: 00007fc828d459c0 R15: 000000000118cf4c
Modules linked in:
---[ end trace 4393ceea4b4b1821 ]---
RIP: 0010:rcu_segcblist_enqueue+0x90/0xf0 kernel/rcu/rcu_segcblist.c:250
Code: 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 75 4e 48 b8 00 00 00 00 00 fc ff df 48 8b 6b 20 48 89 ea 48 c1 ea 03 <80> 3c 02 00 75 21 48 89 75 00 48 89 73 20 48 83 c4 08 5b 5d c3 48
RSP: 0018:ffffc90008317c08 EFLAGS: 00010046
RAX: dffffc0000000000 RBX: ffff8880ae400080 RCX: ffffffff815be040
RDX: 0000000000000000 RSI: ffffc90008317cf0 RDI: ffff8880ae4000a0
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000003
R10: fffff52001062f73 R11: 6637303030302052 R12: ffffc90008317cf0
R13: 0000000000000000 R14: ffff8880ae400080 R15: ffff8880ae400040
FS: 00007fc828d45700(0000) GS:ffff8880ae400000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000001590004 CR3: 00000000998bd000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400


---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
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