./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor3812816699 <...> Warning: Permanently added '10.128.0.55' (ED25519) to the list of known hosts. execve("./syz-executor3812816699", ["./syz-executor3812816699"], 0x7ffca0bf1aa0 /* 10 vars */) = 0 brk(NULL) = 0x55556435c000 brk(0x55556435cd00) = 0x55556435cd00 arch_prctl(ARCH_SET_FS, 0x55556435c380) = 0 set_tid_address(0x55556435c650) = 357 set_robust_list(0x55556435c660, 24) = 0 rseq(0x55556435cca0, 0x20, 0, 0x53053053) = -1 ENOSYS (Function not implemented) prlimit64(0, RLIMIT_STACK, NULL, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0 readlink("/proc/self/exe", "/root/syz-executor3812816699", 4096) = 28 getrandom("\x78\xf3\x0c\x80\xd7\xb3\x39\x1a", 8, GRND_NONBLOCK) = 8 brk(NULL) = 0x55556435cd00 brk(0x55556437dd00) = 0x55556437dd00 brk(0x55556437e000) = 0x55556437e000 mprotect(0x7f43e974e000, 16384, PROT_READ) = 0 mmap(0x1ffffffff000, 4096, PROT_NONE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x1ffffffff000 mmap(0x200000000000, 16777216, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x200000000000 mmap(0x200001000000, 4096, PROT_NONE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x200001000000 clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x55556435c650) = 358 ./strace-static-x86_64: Process 358 attached [pid 358] set_robust_list(0x55556435c660, 24) = 0 [pid 358] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 358] setpgid(0, 0) = 0 [pid 358] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3 [pid 358] write(3, "1000", 4) = 4 [pid 358] close(3) = 0 [pid 358] write(1, "executing program\n", 18executing program ) = 18 [pid 358] openat(AT_FDCWD, "/dev/kvm", O_RDONLY) = 3 [ 25.382976][ T23] audit: type=1400 audit(1742495499.230:66): avc: denied { execmem } for pid=357 comm="syz-executor381" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1 [ 25.407760][ T23] audit: type=1400 audit(1742495499.250:67): avc: denied { read } for pid=358 comm="syz-executor381" name="kvm" dev="devtmpfs" ino=93 scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:kvm_device_t tclass=chr_file permissive=1 [ 25.422919][ T358] L1TF CPU bug present and SMT on, data leak possible. See CVE-2018-3646 and https://www.kernel.org/doc/html/latest/admin-guide/hw-vuln/l1tf.html for details. [ 25.431625][ T23] audit: type=1400 audit(1742495499.250:68): avc: denied { open } for pid=358 comm="syz-executor381" path="/dev/kvm" dev="devtmpfs" ino=93 scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:kvm_device_t tclass=chr_file permissive=1 [pid 358] ioctl(3, KVM_CREATE_VM, 0) = 4 [pid 358] ioctl(4, KVM_SET_USER_MEMORY_REGION, {slot=0, flags=0, guest_phys_addr=0, memory_size=8192, userspace_addr=0x200000000000}) = 0 [pid 358] ioctl(4, KVM_CREATE_VCPU, 0) = 5 [pid 358] setsockopt(-1, SOL_SOCKET, SO_BUSY_POLL, NULL, 0) = -1 EBADF (Bad file descriptor) [ 25.469530][ T23] audit: type=1400 audit(1742495499.270:69): avc: denied { ioctl } for pid=358 comm="syz-executor381" path="/dev/kvm" dev="devtmpfs" ino=93 ioctlcmd=0xae01 scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:kvm_device_t tclass=chr_file permissive=1 [ 25.512994][ T358] BUG: kernel NULL pointer dereference, address: 0000000000000086 [ 25.520611][ T358] #PF: supervisor instruction fetch in kernel mode [ 25.526940][ T358] #PF: error_code(0x0010) - not-present page [ 25.532842][ T358] PGD 0 P4D 0 [ 25.536055][ T358] Oops: 0010 [#1] PREEMPT SMP KASAN [ 25.541097][ T358] CPU: 1 PID: 358 Comm: syz-executor381 Not tainted 5.4.290-syzkaller-00002-g41adfeb3d639 #0 [ 25.551126][ T358] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 [ 25.560990][ T358] RIP: 0010:0x86 [ 25.564357][ T358] Code: Bad RIP value. [ 25.568256][ T358] RSP: 0018:ffff8881eee4f308 EFLAGS: 00010086 [ 25.574159][ T358] RAX: ffff8881eee4f338 RBX: dffffc0000000000 RCX: ffff8881ee98af40 [ 25.581969][ T358] RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 [ 25.589786][ T358] RBP: 0000000000000270 R08: ffffffff8231cd01 R09: ffffffff811c8f95 [ 25.597591][ T358] R10: ffff8881ee98af40 R11: 0000000000000002 R12: ffffffff84600228 [ 25.605401][ T358] R13: fffffe0000000278 R14: ffff8881ee060000 R15: fffffe000000027b [ 25.613218][ T358] FS: 000055556435c380(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000 [ 25.621982][ T358] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 25.628403][ T358] CR2: 000000000000005c CR3: 00000001eed32000 CR4: 00000000003426a0 [ 25.636314][ T358] Call Trace: [ 25.639446][ T358] ? __die+0xb4/0x100 [ 25.643252][ T358] ? no_context+0xac7/0xd20 [ 25.647590][ T358] ? is_prefetch+0x4b0/0x4b0 [ 25.652014][ T358] ? rcu_preempt_deferred_qs+0xa4/0x2b0 [ 25.657397][ T358] ? __do_page_fault+0xa72/0xbb0 [ 25.662169][ T358] ? vmx_spec_ctrl_restore_host+0x83/0xfd [ 25.667723][ T358] ? __bad_area_nosemaphore+0xc0/0x470 [ 25.673020][ T358] ? page_fault+0x2f/0x40 [ 25.677183][ T358] ? irq_entries_start+0x38/0x660 [ 25.682056][ T358] ? vmx_handle_exit_irqoff+0x45/0x220 [ 25.687341][ T358] ? check_preemption_disabled+0x91/0x320 [ 25.692912][ T358] ? handle_external_interrupt_irqoff+0x148/0x2f0 [ 25.699144][ T358] ? handle_external_interrupt_irqoff+0x12a/0x2f0 [ 25.705393][ T358] ? irq_entries_start+0x38/0x660 [ 25.710254][ T358] ? vcpu_enter_guest+0x2d06/0x9f70 [ 25.715288][ T358] ? find_next_and_bit+0x156/0x190 [ 25.720232][ T358] ? load_balance+0x43e1/0x7a40 [ 25.725104][ T358] ? local_bh_enable+0x20/0x20 [ 25.729708][ T358] ? check_preemption_disabled+0x9f/0x320 [ 25.735338][ T358] ? update_blocked_averages+0xd50/0xd50 [ 25.740823][ T358] ? vmx_vcpu_load_vmcs+0x655/0x8b0 [ 25.745846][ T358] ? read_msr+0x40/0x40 [ 25.749844][ T358] ? check_preemption_disabled+0x9f/0x320 [ 25.755396][ T358] ? kvm_sched_clock_read+0x14/0x40 [ 25.760437][ T358] ? check_preemption_disabled+0x9f/0x320 [ 25.765981][ T358] ? debug_smp_processor_id+0x20/0x20 [ 25.771188][ T358] ? kvm_arch_vcpu_ioctl_run+0x748/0x18d0 [ 25.776744][ T358] ? kvm_vcpu_ioctl+0x7f9/0xd10 [ 25.781445][ T358] ? create_vcpu_fd+0x120/0x120 [ 25.786126][ T358] ? _raw_spin_lock_irq+0xa5/0x1b0 [ 25.791076][ T358] ? _raw_spin_lock_irqsave+0x210/0x210 [ 25.796530][ T358] ? cgroup_update_frozen+0x157/0xab0 [ 25.801736][ T358] ? cgroup_update_frozen+0x157/0xab0 [ 25.806961][ T358] ? cgroup_leave_frozen+0x13c/0x290 [ 25.812070][ T358] ? ptrace_stop+0x6ee/0xa30 [ 25.816490][ T358] ? create_vcpu_fd+0x120/0x120 [ 25.821190][ T358] ? do_vfs_ioctl+0x742/0x1720 [ 25.825790][ T358] ? ioctl_preallocate+0x250/0x250 [ 25.830746][ T358] ? check_preemption_disabled+0x153/0x320 [ 25.836369][ T358] ? syscall_trace_enter+0x650/0x940 [ 25.841490][ T358] ? do_syscall_64+0x1c0/0x1c0 [ 25.846087][ T358] ? switch_fpu_return+0x1d4/0x410 [ 25.851038][ T358] ? security_file_ioctl+0x7d/0xa0 [ 25.855981][ T358] ? __x64_sys_ioctl+0xd4/0x110 [ 25.860668][ T358] ? do_syscall_64+0xca/0x1c0 [ 25.865181][ T358] ? entry_SYSCALL_64_after_hwframe+0x5c/0xc1 [ 25.871167][ T358] Modules linked in: [ 25.874910][ T358] CR2: 0000000000000086 [ 25.878908][ T358] ---[ end trace ab16b7ee4770b4ab ]--- [ 25.884185][ T358] RIP: 0010:0x86 [ 25.887574][ T358] Code: Bad RIP value. [ 25.891475][ T358] RSP: 0018:ffff8881eee4f308 EFLAGS: 00010086 [ 25.897381][ T358] RAX: ffff8881eee4f338 RBX: dffffc0000000000 RCX: ffff8881ee98af40 [ 25.905190][ T358] RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 [ 25.913001][ T358] RBP: 0000000000000270 R08: ffffffff8231cd01 R09: ffffffff811c8f95 [ 25.920812][ T358] R10: ffff8881ee98af40 R11: 0000000000000002 R12: ffffffff84600228 [ 25.928626][ T358] R13: fffffe0000000278 R14: ffff8881ee060000 R15: fffffe000000027b [ 25.936438][ T358] FS: 000055556435c380(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000 [ 25.945296][ T358] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 25.951798][ T358] CR2: 000000000000005c CR3: 00000001eed32000 CR4: 00000000003426a0 [ 25.959612][ T358] Kernel panic - not syncing: Fatal exception [ 25.965783][ T358] Kernel Offset: disabled [ 25.969917][ T358] Rebooting in 86400 seconds..