BUG: spinlock bad magic in synchronize_srcu

From: Hao Sun
Date: Tue Sep 07 2021 - 06:28:37 EST

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Hello,

When using Healer to fuzz the latest Linux kernel, the following crash
was triggered.

HEAD commit: 27151f177827 Merge tag 'perf-tools-for-v5.15-2021-09-04'
git tree: upstream
console output:
https://drive.google.com/file/d/1AauK3Op9WjrF8tZOM0r76XOGMrvgK65e/view?usp=sharing
kernel config: https://drive.google.com/file/d/1ZMVJ2vNe0EiIEeWNVyrGb7hBdOG5Uj3e/view?usp=sharing
Similar bug report:
https://groups.google.com/g/syzkaller-bugs/c/JMQALBa9wVE/m/_Wp1KGYzBwAJ

Sorry, I don't have a reproducer for this crash, hope the symbolized
report can help.
If you fix this issue, please add the following tag to the commit:
Reported-by: Hao Sun <sunhao.th@xxxxxxxxx>

BUG: spinlock bad magic on CPU#3, syz-executor/11945
lock: 0xffff88813dd00040, .magic: 00000000, .owner: <none>/-1, .owner_cpu: 0
CPU: 3 PID: 11945 Comm: syz-executor Not tainted 5.14.0+ #13
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x8d/0xcf lib/dump_stack.c:105
spin_bug kernel/locking/spinlock_debug.c:77 [inline]
debug_spin_lock_before kernel/locking/spinlock_debug.c:85 [inline]
do_raw_spin_lock+0x6c/0xc0 kernel/locking/spinlock_debug.c:114
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:117 [inline]
_raw_spin_lock_irqsave+0x40/0x50 kernel/locking/spinlock.c:162
srcu_might_be_idle kernel/rcu/srcutree.c:767 [inline]
synchronize_srcu+0x33/0xf0 kernel/rcu/srcutree.c:1008
kvm_mmu_uninit_vm+0x18/0x30 arch/x86/kvm/mmu/mmu.c:5585
kvm_arch_destroy_vm+0x225/0x2d0 arch/x86/kvm/x86.c:11277
kvm_create_vm arch/x86/kvm/../../../virt/kvm/kvm_main.c:1060 [inline]
kvm_dev_ioctl_create_vm arch/x86/kvm/../../../virt/kvm/kvm_main.c:4486 [inline]
kvm_dev_ioctl+0x7c7/0xc00 arch/x86/kvm/../../../virt/kvm/kvm_main.c:4541
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:874 [inline]
__se_sys_ioctl fs/ioctl.c:860 [inline]
__x64_sys_ioctl+0xb6/0x100 fs/ioctl.c:860
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x34/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x46a9a9
Code: f7 d8 64 89 02 b8 ff ff ff ff c3 66 0f 1f 44 00 00 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 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f7df63cfc58 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 000000000078c0a0 RCX: 000000000046a9a9
RDX: 0000000000000000 RSI: 000000000000ae01 RDI: 0000000000000003
RBP: 00000000004e4042 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000078c0a0
R13: 0000000000000000 R14: 000000000078c0a0 R15: 00007fff67e58cd0
BUG: kernel NULL pointer dereference, address: 0000000000000000
#PF: supervisor write access in kernel mode
#PF: error_code(0x0002) - not-present page
PGD 104cb6067 P4D 104cb6067 PUD 10574c067 PMD 0
Oops: 0002 [#1] PREEMPT SMP
CPU: 3 PID: 11945 Comm: syz-executor Not tainted 5.14.0+ #13
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014
RIP: 0010:rcu_segcblist_enqueue+0x2f/0x40 kernel/rcu/rcu_segcblist.c:348
Code: 00 48 8b 47 48 48 83 c0 01 48 89 47 48 f0 83 44 24 fc 00 48 8b
47 68 48 83 c0 01 48 89 47 68 48 c7 06 00 00 00 00 48 8b 47 20 <48> 89
30 48 89 77 20 c3 66 0f 1f 84 00 00 00 00 00 48 8b 57 48 48
RSP: 0018:ffffc90000a0bd48 EFLAGS: 00010002
RAX: 0000000000000000 RBX: ffffc90000a0bdb0 RCX: ffffc90000a5d000
RDX: 0000000000000001 RSI: ffffc90000a0bdb0 RDI: ffff88813dd00080
RBP: ffffc90000a0bda0 R08: 0000000000000001 R09: 0000000000000000
R10: ffffc90000a0bd80 R11: 3030303030302052 R12: ffffc90001681d10
R13: 0000000000000000 R14: 0000000000000000 R15: ffff88813dd00080
FS: 00007f7df63d0700(0000) GS:ffff88813dd00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000100f94000 CR4: 0000000000750ee0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
PKRU: 55555554
Call Trace:
srcu_gp_start_if_needed+0xb4/0x480 kernel/rcu/srcutree.c:823
__synchronize_srcu+0x13a/0x1a0 kernel/rcu/srcutree.c:929
kvm_mmu_uninit_vm+0x18/0x30 arch/x86/kvm/mmu/mmu.c:5585
kvm_arch_destroy_vm+0x225/0x2d0 arch/x86/kvm/x86.c:11277
kvm_create_vm arch/x86/kvm/../../../virt/kvm/kvm_main.c:1060 [inline]
kvm_dev_ioctl_create_vm arch/x86/kvm/../../../virt/kvm/kvm_main.c:4486 [inline]
kvm_dev_ioctl+0x7c7/0xc00 arch/x86/kvm/../../../virt/kvm/kvm_main.c:4541
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:874 [inline]
__se_sys_ioctl fs/ioctl.c:860 [inline]
__x64_sys_ioctl+0xb6/0x100 fs/ioctl.c:860
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x34/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x46a9a9
Code: f7 d8 64 89 02 b8 ff ff ff ff c3 66 0f 1f 44 00 00 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 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f7df63cfc58 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 000000000078c0a0 RCX: 000000000046a9a9
RDX: 0000000000000000 RSI: 000000000000ae01 RDI: 0000000000000003
RBP: 00000000004e4042 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000078c0a0
R13: 0000000000000000 R14: 000000000078c0a0 R15: 00007fff67e58cd0
Modules linked in:
Dumping ftrace buffer:
(ftrace buffer empty)
CR2: 0000000000000000
---[ end trace a7c9cbcbae2d6a4b ]---
RIP: 0010:rcu_segcblist_enqueue+0x2f/0x40 kernel/rcu/rcu_segcblist.c:348
Code: 00 48 8b 47 48 48 83 c0 01 48 89 47 48 f0 83 44 24 fc 00 48 8b
47 68 48 83 c0 01 48 89 47 68 48 c7 06 00 00 00 00 48 8b 47 20 <48> 89
30 48 89 77 20 c3 66 0f 1f 84 00 00 00 00 00 48 8b 57 48 48
RSP: 0018:ffffc90000a0bd48 EFLAGS: 00010002
RAX: 0000000000000000 RBX: ffffc90000a0bdb0 RCX: ffffc90000a5d000
RDX: 0000000000000001 RSI: ffffc90000a0bdb0 RDI: ffff88813dd00080
RBP: ffffc90000a0bda0 R08: 0000000000000001 R09: 0000000000000000
R10: ffffc90000a0bd80 R11: 3030303030302052 R12: ffffc90001681d10
R13: 0000000000000000 R14: 0000000000000000 R15: ffff88813dd00080
FS: 00007f7df63d0700(0000) GS:ffff88813dd00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000100f94000 CR4: 0000000000750ee0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
PKRU: 55555554
----------------
Code disassembly (best guess):
0: 00 48 8b add %cl,-0x75(%rax)
3: 47 rex.RXB
4: 48 rex.W
5: 48 83 c0 01 add $0x1,%rax
9: 48 89 47 48 mov %rax,0x48(%rdi)
d: f0 83 44 24 fc 00 lock addl $0x0,-0x4(%rsp)
13: 48 8b 47 68 mov 0x68(%rdi),%rax
17: 48 83 c0 01 add $0x1,%rax
1b: 48 89 47 68 mov %rax,0x68(%rdi)
1f: 48 c7 06 00 00 00 00 movq $0x0,(%rsi)
26: 48 8b 47 20 mov 0x20(%rdi),%rax
* 2a: 48 89 30 mov %rsi,(%rax) <-- trapping instruction
2d: 48 89 77 20 mov %rsi,0x20(%rdi)
31: c3 retq
32: 66 0f 1f 84 00 00 00 nopw 0x0(%rax,%rax,1)
39: 00 00
3b: 48 8b 57 48 mov 0x48(%rdi),%rdx
3f: 48 rex.W%

Next message: Ulf Hansson: "Re: [PATCH v3 2/2] drivers: bus: Delete CONFIG_SIMPLE_PM_BUS"
Previous message: Bert Vermeulen: "[PATCH v2 5/5] ARM: multi_v7_defconfig: Add support for Airoha EN7523 SoC"
Next in thread: Sean Christopherson: "Re: BUG: spinlock bad magic in synchronize_srcu"
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