bisecting fixing commit since 5695e51619745d4fe3ec2506a2f0cd982c5e27a4
building syzkaller on 4c37c133e4bf703d023995535f1e264d8658e08e
testing commit 5695e51619745d4fe3ec2506a2f0cd982c5e27a4 with gcc (GCC) 10.2.1 20210217
kernel signature: a3eaf2b85a70a46cd8dbbcff93f0a7861e353eaf119082df5bcb832f3b3207ab
all runs: crashed: general protection fault in vmx_vcpu_run
testing current HEAD 8ac91e6c6033ebc12c5c1e4aa171b81a662bd70f
testing commit 8ac91e6c6033ebc12c5c1e4aa171b81a662bd70f with gcc (GCC) 10.2.1 20210217
kernel signature: 9db6b633058b9cb66fea9a67ee60a8a117f1413c6fff4f10fb3fabf484c938b5
run #0: crashed: BUG: spinlock bad magic in synchronize_srcu
run #1: OK
run #2: OK
run #3: OK
run #4: OK
run #5: OK
run #6: OK
run #7: OK
run #8: OK
run #9: OK
reproducer seems to be flaky
Reproducer flagged being flaky
revisions tested: 2, total time: 27m20.938411357s (build: 13m41.608924409s, test: 12m50.729844263s)
the crash still happens on HEAD
commit msg: Merge tag 'for-5.13-rc2-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux
crash: BUG: spinlock bad magic in synchronize_srcu
BUG: spinlock bad magic on CPU#0, syz-executor.2/16746
 lock: 0xffff8880ba000040, .magic: 00000000, .owner: <none>/-1, .owner_cpu: 0
CPU: 0 PID: 16746 Comm: syz-executor.2 Not tainted 5.13.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:79 [inline]
 dump_stack+0x93/0xc2 lib/dump_stack.c:120
 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+0x41/0x50 kernel/locking/spinlock.c:159
 srcu_might_be_idle kernel/rcu/srcutree.c:772 [inline]
 synchronize_srcu+0x4f/0x1c0 kernel/rcu/srcutree.c:1010
 kvm_mmu_uninit_vm+0x10/0x20 arch/x86/kvm/mmu/mmu.c:5481
 kvm_arch_destroy_vm+0x446/0x5f0 arch/x86/kvm/x86.c:10893
 kvm_create_vm arch/x86/kvm/../../../virt/kvm/kvm_main.c:976 [inline]
 kvm_dev_ioctl_create_vm arch/x86/kvm/../../../virt/kvm/kvm_main.c:4219 [inline]
 kvm_dev_ioctl+0xc5f/0x1100 arch/x86/kvm/../../../virt/kvm/kvm_main.c:4271
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:1069 [inline]
 __se_sys_ioctl fs/ioctl.c:1055 [inline]
 __x64_sys_ioctl+0x11f/0x190 fs/ioctl.c:1055
 do_syscall_64+0x3a/0xb0 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x465ef9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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:00007f9f168ca188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 0000000000465ef9
RDX: 0000000000000000 RSI: 000000000000ae01 RDI: 0000000000000003
RBP: 00000000004bcd1c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60
R13: 00007ffd2c7f4cff R14: 00007f9f168ca300 R15: 0000000000022000
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: 16746 Comm: syz-executor.2 Not tainted 5.13.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:rcu_segcblist_enqueue+0xb9/0x130 kernel/rcu/rcu_segcblist.c:348
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:ffffc9000970fc00 EFLAGS: 00010046
RAX: dffffc0000000000 RBX: ffff8880ba000080 RCX: ffffffff81526050
RDX: 0000000000000000 RSI: ffffc9000970fce8 RDI: ffff8880ba0000a0
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000003
R10: fffff520012e1f72 R11: 6637303030302052 R12: ffffc9000970fce8
R13: ffff8880ba000080 R14: 0000000000000000 R15: ffff8880ba000040
FS:  00007f9f168ca700(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f980358a718 CR3: 000000002e056000 CR4: 00000000001526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 srcu_gp_start_if_needed+0x116/0xbc0 kernel/rcu/srcutree.c:828
 __call_srcu kernel/rcu/srcutree.c:888 [inline]
 __synchronize_srcu+0x1d1/0x280 kernel/rcu/srcutree.c:934
 kvm_mmu_uninit_vm+0x10/0x20 arch/x86/kvm/mmu/mmu.c:5481
 kvm_arch_destroy_vm+0x446/0x5f0 arch/x86/kvm/x86.c:10893
 kvm_create_vm arch/x86/kvm/../../../virt/kvm/kvm_main.c:976 [inline]
 kvm_dev_ioctl_create_vm arch/x86/kvm/../../../virt/kvm/kvm_main.c:4219 [inline]
 kvm_dev_ioctl+0xc5f/0x1100 arch/x86/kvm/../../../virt/kvm/kvm_main.c:4271
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:1069 [inline]
 __se_sys_ioctl fs/ioctl.c:1055 [inline]
 __x64_sys_ioctl+0x11f/0x190 fs/ioctl.c:1055
 do_syscall_64+0x3a/0xb0 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x465ef9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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:00007f9f168ca188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 0000000000465ef9
RDX: 0000000000000000 RSI: 000000000000ae01 RDI: 0000000000000003
RBP: 00000000004bcd1c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60
R13: 00007ffd2c7f4cff R14: 00007f9f168ca300 R15: 0000000000022000
Modules linked in:
---[ end trace 998fecd770e57069 ]---
RIP: 0010:rcu_segcblist_enqueue+0xb9/0x130 kernel/rcu/rcu_segcblist.c:348
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:ffffc9000970fc00 EFLAGS: 00010046
RAX: dffffc0000000000 RBX: ffff8880ba000080 RCX: ffffffff81526050
RDX: 0000000000000000 RSI: ffffc9000970fce8 RDI: ffff8880ba0000a0
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000003
R10: fffff520012e1f72 R11: 6637303030302052 R12: ffffc9000970fce8
R13: ffff8880ba000080 R14: 0000000000000000 R15: ffff8880ba000040
FS:  00007f9f168ca700(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f980358a718 CR3: 000000002e056000 CR4: 00000000001526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400