./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor1893680463 <...> Warning: Permanently added '10.128.0.77' (ED25519) to the list of known hosts. execve("./syz-executor1893680463", ["./syz-executor1893680463"], 0x7fff0ca3ac20 /* 10 vars */) = 0 brk(NULL) = 0x55558f32a000 brk(0x55558f32ad00) = 0x55558f32ad00 arch_prctl(ARCH_SET_FS, 0x55558f32a380) = 0 set_tid_address(0x55558f32a650) = 360 set_robust_list(0x55558f32a660, 24) = 0 rseq(0x55558f32aca0, 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-executor1893680463", 4096) = 28 getrandom("\x3f\xdb\x21\x84\x12\x9a\xd3\x64", 8, GRND_NONBLOCK) = 8 brk(NULL) = 0x55558f32ad00 brk(0x55558f34bd00) = 0x55558f34bd00 brk(0x55558f34c000) = 0x55558f34c000 mprotect(0x7fe591300000, 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=0x55558f32a650) = 361 ./strace-static-x86_64: Process 361 attached [pid 361] set_robust_list(0x55558f32a660, 24) = 0 [pid 361] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 361] setpgid(0, 0) = 0 [pid 361] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3 [pid 361] write(3, "1000", 4) = 4 [pid 361] close(3) = 0 [pid 361] write(1, "executing program\n", 18executing program ) = 18 [pid 361] openat(AT_FDCWD, "/dev/kvm", O_RDONLY) = 3 [ 27.923310][ T23] audit: type=1400 audit(1742478568.630:66): avc: denied { execmem } for pid=360 comm="syz-executor189" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1 [ 27.935959][ T361] 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. [pid 361] ioctl(3, KVM_CREATE_VM, 0) = 4 [pid 361] ioctl(4, KVM_SET_USER_MEMORY_REGION, {slot=0, flags=0, guest_phys_addr=0, memory_size=536879104, userspace_addr=0x200000000000}) = 0 [pid 361] ioctl(4, KVM_CREATE_VCPU, 0) = 5 [ 27.943625][ T23] audit: type=1400 audit(1742478568.640:67): avc: denied { read } for pid=361 comm="syz-executor189" name="kvm" dev="devtmpfs" ino=114 scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:kvm_device_t tclass=chr_file permissive=1 [ 27.983138][ T23] audit: type=1400 audit(1742478568.640:68): avc: denied { open } for pid=361 comm="syz-executor189" path="/dev/kvm" dev="devtmpfs" ino=114 scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:kvm_device_t tclass=chr_file permissive=1 [ 28.010499][ T23] audit: type=1400 audit(1742478568.640:69): avc: denied { ioctl } for pid=361 comm="syz-executor189" path="/dev/kvm" dev="devtmpfs" ino=114 ioctlcmd=0xae01 scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:kvm_device_t tclass=chr_file permissive=1 [ 28.015400][ T361] BUG: kernel NULL pointer dereference, address: 0000000000000086 [ 28.043332][ T361] #PF: supervisor instruction fetch in kernel mode [ 28.049663][ T361] #PF: error_code(0x0010) - not-present page [ 28.055477][ T361] PGD 0 P4D 0 [ 28.058722][ T361] Oops: 0010 [#1] PREEMPT SMP KASAN [ 28.063724][ T361] CPU: 1 PID: 361 Comm: syz-executor189 Not tainted 5.4.290-syzkaller-00002-g41adfeb3d639 #0 [ 28.073755][ T361] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 [ 28.083606][ T361] RIP: 0010:0x86 [ 28.086992][ T361] Code: Bad RIP value. [ 28.090988][ T361] RSP: 0018:ffff8881dff47308 EFLAGS: 00010086 [ 28.096883][ T361] RAX: ffff8881dff47338 RBX: dffffc0000000000 RCX: ffff8881f0ce9f80 [ 28.104783][ T361] RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 [ 28.112598][ T361] RBP: 0000000000000270 R08: ffffffff8231cd01 R09: ffffffff811c8f95 [ 28.120406][ T361] R10: ffff8881f0ce9f80 R11: 0000000000000002 R12: ffffffff84600228 [ 28.128217][ T361] R13: fffffe0000000278 R14: ffff8881ee5f8000 R15: fffffe000000027b [ 28.136029][ T361] FS: 000055558f32a380(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000 [ 28.144984][ T361] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 28.151385][ T361] CR2: 000000000000005c CR3: 00000001e0500000 CR4: 00000000003426a0 [ 28.159285][ T361] Call Trace: [ 28.162506][ T361] ? __die+0xb4/0x100 [ 28.166317][ T361] ? no_context+0xac7/0xd20 [ 28.170692][ T361] ? is_prefetch+0x4b0/0x4b0 [ 28.175168][ T361] ? rcu_preempt_deferred_qs+0xa4/0x2b0 [ 28.180820][ T361] ? __do_page_fault+0xa72/0xbb0 [ 28.185587][ T361] ? vmx_spec_ctrl_restore_host+0x83/0xfd [ 28.191233][ T361] ? __bad_area_nosemaphore+0xc0/0x470 [ 28.196618][ T361] ? page_fault+0x2f/0x40 [ 28.200773][ T361] ? irq_entries_start+0x38/0x660 [ 28.205664][ T361] ? vmx_handle_exit_irqoff+0x45/0x220 [ 28.211149][ T361] ? check_preemption_disabled+0x91/0x320 [ 28.216911][ T361] ? handle_external_interrupt_irqoff+0x148/0x2f0 [ 28.223156][ T361] ? handle_external_interrupt_irqoff+0x12a/0x2f0 [ 28.229483][ T361] ? irq_entries_start+0x38/0x660 [ 28.234353][ T361] ? vcpu_enter_guest+0x2d06/0x9f70 [ 28.239394][ T361] ? check_preemption_disabled+0x9f/0x320 [ 28.245116][ T361] ? _raw_spin_lock_irqsave+0xf9/0x210 [ 28.250526][ T361] ? check_preemption_disabled+0x9f/0x320 [ 28.256269][ T361] ? _raw_spin_lock+0x1b0/0x1b0 [ 28.260932][ T361] ? debug_smp_processor_id+0x20/0x20 [ 28.266224][ T361] ? local_bh_enable+0x20/0x20 [ 28.270827][ T361] ? internal_add_timer+0x34b/0x430 [ 28.275945][ T361] ? _raw_spin_unlock_irqrestore+0x57/0x80 [ 28.281588][ T361] ? __mod_timer+0x72b/0x13e0 [ 28.286101][ T361] ? mod_timer_pending+0x20/0x20 [ 28.291000][ T361] ? _raw_spin_lock_irqsave+0xf9/0x210 [ 28.296296][ T361] ? read_msr+0x40/0x40 [ 28.300371][ T361] ? check_preemption_disabled+0x9f/0x320 [ 28.305926][ T361] ? __fd_install+0x119/0x230 [ 28.310443][ T361] ? update_load_avg+0x40f/0x1210 [ 28.315300][ T361] ? check_preemption_disabled+0x9f/0x320 [ 28.320943][ T361] ? debug_smp_processor_id+0x20/0x20 [ 28.326151][ T361] ? resched_curr+0x9b/0x200 [ 28.330584][ T361] ? check_preempt_wakeup+0x4f6/0x9f0 [ 28.335788][ T361] ? vmx_vcpu_load_vmcs+0x655/0x8b0 [ 28.341185][ T361] ? try_to_wake_up+0x7c5/0x14f0 [ 28.345943][ T361] ? read_msr+0x40/0x40 [ 28.349938][ T361] ? check_preemption_disabled+0x9f/0x320 [ 28.355490][ T361] ? check_preemption_disabled+0x9f/0x320 [ 28.361069][ T361] ? debug_smp_processor_id+0x20/0x20 [ 28.366358][ T361] ? kvm_arch_vcpu_ioctl_run+0x748/0x18d0 [ 28.372006][ T361] ? kvm_vcpu_ioctl+0x7f9/0xd10 [ 28.376687][ T361] ? create_vcpu_fd+0x120/0x120 [ 28.381366][ T361] ? _raw_spin_lock_irq+0xa5/0x1b0 [ 28.386398][ T361] ? _raw_spin_lock_irqsave+0x210/0x210 [ 28.391883][ T361] ? cgroup_update_frozen+0x157/0xab0 [ 28.397339][ T361] ? cgroup_update_frozen+0x157/0xab0 [ 28.402678][ T361] ? cgroup_leave_frozen+0x13c/0x290 [ 28.407999][ T361] ? ptrace_stop+0x6ee/0xa30 [ 28.412457][ T361] ? create_vcpu_fd+0x120/0x120 [ 28.417107][ T361] ? do_vfs_ioctl+0x742/0x1720 [ 28.422202][ T361] ? ioctl_preallocate+0x250/0x250 [ 28.427168][ T361] ? check_preemption_disabled+0x153/0x320 [ 28.432962][ T361] ? syscall_trace_enter+0x650/0x940 [ 28.438271][ T361] ? do_syscall_64+0x1c0/0x1c0 [ 28.443041][ T361] ? switch_fpu_return+0x1d4/0x410 [ 28.447978][ T361] ? security_file_ioctl+0x7d/0xa0 [ 28.452923][ T361] ? __x64_sys_ioctl+0xd4/0x110 [ 28.457611][ T361] ? do_syscall_64+0xca/0x1c0 [ 28.462159][ T361] ? entry_SYSCALL_64_after_hwframe+0x5c/0xc1 [ 28.468021][ T361] Modules linked in: [ 28.471756][ T361] CR2: 0000000000000086 [ 28.475774][ T361] ---[ end trace b02b116c623ff379 ]--- [ 28.481243][ T361] RIP: 0010:0x86 [ 28.484608][ T361] Code: Bad RIP value. [ 28.488522][ T361] RSP: 0018:ffff8881dff47308 EFLAGS: 00010086 [ 28.494676][ T361] RAX: ffff8881dff47338 RBX: dffffc0000000000 RCX: ffff8881f0ce9f80 [ 28.502917][ T361] RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 [ 28.510819][ T361] RBP: 0000000000000270 R08: ffffffff8231cd01 R09: ffffffff811c8f95 [ 28.518868][ T361] R10: ffff8881f0ce9f80 R11: 0000000000000002 R12: ffffffff84600228 [ 28.526971][ T361] R13: fffffe0000000278 R14: ffff8881ee5f8000 R15: fffffe000000027b [ 28.534937][ T361] FS: 000055558f32a380(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000 [ 28.543875][ T361] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 28.550294][ T361] CR2: 000000000000005c CR3: 00000001e0500000 CR4: 00000000003426a0 [ 28.558109][ T361] Kernel panic - not syncing: Fatal exception [ 28.564331][ T361] Kernel Offset: disabled [ 28.568628][ T361] Rebooting in 86400 seconds..