ci2-android-6-1/strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ci2-android-6-1/syz-executor785040445 <...> Warning: Permanently added '10.128.1.106' (ED25519) to the list of known hosts. execve("ci2-android-6-1/syz-executor785040445", ["ci2-android-6-1/syz-executor785040445"], 0x7ffc04ace9d0 /* 10 vars */) = 0 brk(NULL) = 0x55556876c000 brk(0x55556876ce00) = 0x55556876ce00 arch_prctl(ARCH_SET_FS, 0x55556876c480) = 0 set_tid_address(0x55556876c750) = 305 set_robust_list(0x55556876c760, 24) = 0 rseq({cpu_id_start=0, cpu_id=RSEQ_CPU_ID_UNINITIALIZED, rseq_cs=NULL, flags=0, node_id=0, mm_cid=0, slice_ctrl={request=0, granted=0, __reserved=0}, __reserved=0}, 32, 0, 0x53053053) = -1 ENOSYS (Function not implemented) prlimit64(0, RLIMIT_STACK, NULL, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0 readlinkat(AT_FDCWD, "/proc/self/exe", "/root/ci2-android-6-1/syz-executor785040445", 4096) = 43 getrandom("\x01\x8e\x23\x3d\x82\x2a\xb7\xcf", 8, GRND_NONBLOCK) = 8 brk(NULL) = 0x55556876ce00 brk(0x55556878de00) = 0x55556878de00 brk(0x55556878e000) = 0x55556878e000 mprotect(0x7f40df759000, 20480, 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 rt_sigprocmask(SIG_BLOCK, ~[], [], 8) = 0 clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x55556876c750) = 306 ci2-android-6-1/strace-static-x86_64: Process 306 attached [pid 305] rt_sigprocmask(SIG_SETMASK, [] [pid 306] set_robust_list(0x55556876c760, 24) = 0 [pid 306] rt_sigprocmask(SIG_SETMASK, [] [pid 305] <... rt_sigprocmask resumed>, NULL, 8) = 0 [pid 306] <... rt_sigprocmask resumed>, NULL, 8) = 0 [pid 305] openat(AT_FDCWD, "/sys/kernel/debug/x86/nmi_longest_ns", O_WRONLY|O_CLOEXEC) = 3 [pid 305] write(3, "10000000000", 11) = 11 [pid 305] close(3) = 0 [pid 305] openat(AT_FDCWD, "/proc/sys/kernel/hung_task_check_interval_secs", O_WRONLY|O_CLOEXEC) = 3 [pid 305] write(3, "20", 2) = 2 [pid 305] close(3) = 0 [pid 305] openat(AT_FDCWD, "/proc/sys/net/core/bpf_jit_kallsyms", O_WRONLY|O_CLOEXEC) = 3 [pid 305] write(3, "1", 1) = 1 [pid 305] close(3) = 0 [pid 305] openat(AT_FDCWD, "/proc/sys/net/core/bpf_jit_harden", O_WRONLY|O_CLOEXEC) = 3 [pid 305] write(3, "0", 1) = 1 [pid 305] close(3) = 0 [pid 305] openat(AT_FDCWD, "/proc/sys/kernel/kptr_restrict", O_WRONLY|O_CLOEXEC) = 3 [pid 305] write(3, "0", 1) = 1 [pid 305] close(3) = 0 [pid 305] openat(AT_FDCWD, "/proc/sys/kernel/softlockup_all_cpu_backtrace", O_WRONLY|O_CLOEXEC) = 3 [pid 305] write(3, "1", 1) = 1 [pid 305] close(3) = 0 [pid 305] openat(AT_FDCWD, "/proc/sys/fs/mount-max", O_WRONLY|O_CLOEXEC) = 3 [pid 305] write(3, "100", 3) = 3 [pid 305] close(3) = 0 [pid 305] openat(AT_FDCWD, "/proc/sys/vm/oom_dump_tasks", O_WRONLY|O_CLOEXEC) = 3 [pid 305] write(3, "0", 1) = 1 [pid 305] close(3) = 0 [pid 305] openat(AT_FDCWD, "/proc/sys/debug/exception-trace", O_WRONLY|O_CLOEXEC) = 3 [pid 305] write(3, "0", 1) = 1 [pid 305] close(3) = 0 [pid 305] openat(AT_FDCWD, "/proc/sys/kernel/printk", O_WRONLY|O_CLOEXEC) = 3 [pid 305] write(3, "7 4 1 3", 7) = 7 [pid 305] close(3) = 0 [pid 305] openat(AT_FDCWD, "/proc/sys/kernel/keys/gc_delay", O_WRONLY|O_CLOEXEC) = 3 [pid 305] write(3, "1", 1) = 1 [pid 305] close(3) = 0 [pid 305] openat(AT_FDCWD, "/proc/sys/vm/oom_kill_allocating_task", O_WRONLY|O_CLOEXEC) = 3 [pid 305] write(3, "1", 1) = 1 [pid 305] close(3) = 0 [pid 305] openat(AT_FDCWD, "/sys/kernel/debug/failslab/task-filter", O_WRONLY|O_CLOEXEC) = 3 [pid 305] write(3, "Y", 1) = 1 [pid 305] close(3) = 0 [pid 305] openat(AT_FDCWD, "/sys/kernel/debug/fail_page_alloc/task-filter", O_WRONLY|O_CLOEXEC) = 3 [pid 305] write(3, "Y", 1) = 1 [pid 305] close(3) = 0 [pid 305] openat(AT_FDCWD, "/sys/kernel/debug/fail_futex/task-filter", O_WRONLY|O_CLOEXEC) = 3 [pid 305] write(3, "Y", 1) = 1 [pid 305] close(3) = 0 [pid 305] openat(AT_FDCWD, "/sys/kernel/debug/fail_usercopy/task-filter", O_WRONLY|O_CLOEXEC) = 3 [pid 305] write(3, "Y", 1) = 1 [pid 305] close(3) = 0 [pid 305] openat(AT_FDCWD, "/sys/kernel/debug/fail_make_request/task-filter", O_WRONLY|O_CLOEXEC) = 3 [pid 305] write(3, "Y", 1) = 1 [pid 305] close(3) = 0 [pid 305] openat(AT_FDCWD, "/sys/kernel/debug/fail_io_timeout/task-filter", O_WRONLY|O_CLOEXEC) = 3 [pid 305] write(3, "Y", 1) = 1 [pid 305] close(3) = 0 [pid 305] openat(AT_FDCWD, "/sys/kernel/debug/fail_iommufd/task-filter", O_WRONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory) [pid 305] openat(AT_FDCWD, "/proc/sys/kernel/ctrl-alt-del", O_WRONLY|O_CLOEXEC) = 3 [pid 305] write(3, "0", 1) = 1 [pid 305] close(3) = 0 [pid 305] openat(AT_FDCWD, "/proc/sys/kernel/cad_pid", O_WRONLY|O_CLOEXEC) = 3 [pid 305] write(3, "306", 3) = 3 [pid 305] close(3) = 0 [pid 305] kill(306, SIGKILL) = 0 [pid 306] +++ killed by SIGKILL +++ --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_KILLED, si_pid=306, si_uid=0, si_status=SIGKILL, si_utime=0, si_stime=0} --- rt_sigaction(SIGRTMIN, {sa_handler=SIG_IGN, sa_mask=[], sa_flags=0}, NULL, 8) = 0 rt_sigaction(SIGRT_1, {sa_handler=SIG_IGN, sa_mask=[], sa_flags=0}, NULL, 8) = 0 rt_sigaction(SIGSEGV, {sa_handler=0x7f40df6b4040, sa_mask=[], sa_flags=SA_RESTORER|SA_NODEFER|SA_SIGINFO, sa_restorer=0x7f40df6b6c10}, NULL, 8) = 0 rt_sigaction(SIGBUS, {sa_handler=0x7f40df6b4040, sa_mask=[], sa_flags=SA_RESTORER|SA_NODEFER|SA_SIGINFO, sa_restorer=0x7f40df6b6c10}, NULL, 8) = 0 getrandom("\x14\xcd\x4c\x55\x4c\x1b\x29\x6a", 8, GRND_NONBLOCK) = 8 mkdir("./syzkaller.Siilvn", 0700) = 0 chmod("./syzkaller.Siilvn", 0777) = 0 chdir("./syzkaller.Siilvn") = 0 write(1, "executing program\n", 18) = 18 executing program socket(AF_PPPOX, SOCK_STREAM, 1) = 3 socket(AF_INET6, SOCK_DGRAM, IPPROTO_IP) = 4 connect(3, {sa_family=AF_PPPOX, sa_data="\x01\x00\x00\x00\x03\x00\x00\x00\x04\x00\x00\x00\x02\x00\x4e\x23\xff\xff\xff\xff\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x00\x00\x00\x00\x00\x00\x04\x00\x00\x00\x00\x00\x00\x00"}, 46) = 0 ioctl(3, FIONREAD, NULL) = -1 ENOTTY (Inappropriate ioctl for device) exit_group(0) = ? [ 26.215905][ T28] audit: type=1400 audit(1786659962.267:64): avc: denied { execmem } for pid=305 comm="syz-executor785" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1 [ 26.247030][ T28] audit: type=1400 audit(1786659962.297:65): avc: denied { create } for pid=305 comm="syz-executor785" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=pppox_socket permissive=1 [ 26.267317][ T28] audit: type=1400 audit(1786659962.297:66): avc: denied { connect } for pid=305 comm="syz-executor785" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=pppox_socket permissive=1 [ 26.287380][ T305] ================================================================== [ 26.295492][ T305] BUG: KASAN: use-after-free in mutex_lock+0x86/0x1b0 [ 26.302274][ T305] Write of size 8 at addr ffff88810de9a550 by task syz-executor785/305 [ 26.310503][ T305] [ 26.312820][ T305] CPU: 1 PID: 305 Comm: syz-executor785 Not tainted syzkaller #0 [ 26.320526][ T305] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 [ 26.330589][ T305] Call Trace: [ 26.333864][ T305] [ 26.336795][ T305] __dump_stack+0x21/0x24 [ 26.341127][ T305] dump_stack_lvl+0x110/0x170 [ 26.345803][ T305] ? __cfi_dump_stack_lvl+0x8/0x8 [ 26.350825][ T305] ? mutex_lock+0x86/0x1b0 [ 26.355246][ T305] print_address_description+0x71/0x200 [ 26.360786][ T305] print_report+0x4a/0x60 [ 26.365121][ T305] kasan_report+0x122/0x150 [ 26.369621][ T305] ? mutex_lock+0x86/0x1b0 [ 26.374039][ T305] kasan_check_range+0x249/0x2a0 [ 26.378979][ T305] __kasan_check_write+0x14/0x20 [ 26.383921][ T305] mutex_lock+0x86/0x1b0 [ 26.388161][ T305] ? __cfi_mutex_lock+0x10/0x10 [ 26.393014][ T305] ? kfree+0x6f/0xf0 [ 26.396911][ T305] ? l2tp_session_put+0xaf/0x1a0 [ 26.401842][ T305] ? l2tp_session_delete+0x3df/0x4d0 [ 26.407121][ T305] pppol2tp_release+0x178/0x2b0 [ 26.411988][ T305] sock_close+0xc9/0x220 [ 26.416228][ T305] ? __cfi_sock_close+0x10/0x10 [ 26.421079][ T305] __fput+0x1fd/0x8f0 [ 26.425068][ T305] ____fput+0x15/0x20 [ 26.429051][ T305] task_work_run+0x1e1/0x250 [ 26.433633][ T305] ? __cfi_task_work_run+0x10/0x10 [ 26.438739][ T305] ? __kasan_check_write+0x14/0x20 [ 26.443843][ T305] do_exit+0xaf2/0x2850 [ 26.448005][ T305] ? ptrace_stop+0x6dc/0x8e0 [ 26.452594][ T305] ? __cfi_do_exit+0x10/0x10 [ 26.457190][ T305] ? __kasan_check_write+0x14/0x20 [ 26.462290][ T305] ? _raw_spin_lock_irq+0x95/0xf0 [ 26.467316][ T305] ? __cfi__raw_spin_lock_irq+0x10/0x10 [ 26.472871][ T305] ? zap_other_threads+0x2c1/0x2f0 [ 26.478016][ T305] do_group_exit+0x21b/0x2e0 [ 26.482625][ T305] __x64_sys_exit_group+0x3f/0x40 [ 26.487652][ T305] x64_sys_call+0x7b4/0x9a0 [ 26.492154][ T305] do_syscall_64+0x4c/0xa0 [ 26.496583][ T305] ? clear_bhb_loop+0x30/0x80 [ 26.501251][ T305] ? clear_bhb_loop+0x30/0x80 [ 26.505923][ T305] entry_SYSCALL_64_after_hwframe+0x68/0xd2 [ 26.511826][ T305] RIP: 0033:0x7f40df6c4d45 [ 26.516238][ T305] Code: Unable to access opcode bytes at 0x7f40df6c4d1b. [ 26.523258][ T305] RSP: 002b:00007ffd95973968 EFLAGS: 00000202 ORIG_RAX: 00000000000000e7 [ 26.531690][ T305] RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 00007f40df6c4d45 [ 26.539749][ T305] RDX: 00000000000000e7 RSI: ffffffffffffffd8 RDI: 0000000000000000 [ 26.547718][ T305] RBP: 0000000000000000 R08: 0000000000000000 R09: 6c616b7a79732f2e [ 26.555699][ T305] R10: 6c616b7a79732f2e R11: 0000000000000202 R12: 0000000000000000 [ 26.563666][ T305] R13: 00007f40df75e110 R14: 00007f40df760408 R15: 00007f40df760420 [ 26.571656][ T305] [ 26.574670][ T305] [ 26.576983][ T305] Allocated by task 305: [ 26.581211][ T305] kasan_set_track+0x4b/0x70 [ 26.585809][ T305] kasan_save_alloc_info+0x1f/0x30 [ 26.590930][ T305] __kasan_kmalloc+0x95/0xb0 [ 26.595530][ T305] __kmalloc+0xb4/0x1e0 [ 26.599693][ T305] l2tp_session_create+0x38/0xbd0 [ 26.604725][ T305] pppol2tp_connect+0xbf5/0x1640 [ 26.609673][ T305] __sys_connect+0x3da/0x460 [ 26.614266][ T305] __x64_sys_connect+0x7a/0x90 [ 26.619032][ T305] x64_sys_call+0x88d/0x9a0 [ 26.623624][ T305] do_syscall_64+0x4c/0xa0 [ 26.628056][ T305] entry_SYSCALL_64_after_hwframe+0x68/0xd2 [ 26.633974][ T305] [ 26.636303][ T305] Freed by task 305: [ 26.640198][ T305] kasan_set_track+0x4b/0x70 [ 26.644801][ T305] kasan_save_free_info+0x2b/0x40 [ 26.649832][ T305] ____kasan_slab_free+0x132/0x180 [ 26.654956][ T305] __kasan_slab_free+0x11/0x20 [ 26.659732][ T305] slab_free_freelist_hook+0xc2/0x190 [ 26.665110][ T305] __kmem_cache_free+0xb7/0x1b0 [ 26.669989][ T305] kfree+0x6f/0xf0 [ 26.673725][ T305] l2tp_session_put+0xaf/0x1a0 [ 26.678490][ T305] l2tp_session_delete+0x3df/0x4d0 [ 26.683606][ T305] pppol2tp_release+0x169/0x2b0 [ 26.688611][ T305] sock_close+0xc9/0x220 [ 26.692896][ T305] __fput+0x1fd/0x8f0 [ 26.696895][ T305] ____fput+0x15/0x20 [ 26.700899][ T305] task_work_run+0x1e1/0x250 [ 26.705506][ T305] do_exit+0xaf2/0x2850 [ 26.709679][ T305] do_group_exit+0x21b/0x2e0 [ 26.714299][ T305] __x64_sys_exit_group+0x3f/0x40 [ 26.719338][ T305] x64_sys_call+0x7b4/0x9a0 [ 26.723853][ T305] do_syscall_64+0x4c/0xa0 [ 26.728286][ T305] entry_SYSCALL_64_after_hwframe+0x68/0xd2 [ 26.734191][ T305] [ 26.736547][ T305] The buggy address belongs to the object at ffff88810de9a400 [ 26.736547][ T305] which belongs to the cache kmalloc-512 of size 512 [ 26.750626][ T305] The buggy address is located 336 bytes inside of [ 26.750626][ T305] 512-byte region [ffff88810de9a400, ffff88810de9a600) [ 26.763910][ T305] [ 26.766241][ T305] The buggy address belongs to the physical page: [ 26.772661][ T305] page:ffffea000437a600 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10de98 [ 26.782926][ T305] head:ffffea000437a600 order:2 compound_mapcount:0 compound_pincount:0 [ 26.791252][ T305] flags: 0x4000000000010200(slab|head|zone=1) [ 26.797337][ T305] raw: 4000000000010200 ffffea000437a500 dead000000000002 ffff888100042f00 [ 26.805933][ T305] raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000 [ 26.814515][ T305] page dumped because: kasan: bad access detected [ 26.820929][ T305] page_owner tracks the page as allocated [ 26.826653][ T305] page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1, tgid 1 (swapper/0), ts 3154358126, free_ts 0 [ 26.846282][ T305] post_alloc_hook+0x1f5/0x210 [ 26.851058][ T305] prep_new_page+0x1c/0x110 [ 26.855575][ T305] get_page_from_freelist+0x2ca9/0x2d20 [ 26.861136][ T305] __alloc_pages+0x1fa/0x610 [ 26.865745][ T305] alloc_slab_page+0x6e/0xf0 [ 26.870339][ T305] new_slab+0x98/0x3e0 [ 26.874412][ T305] ___slab_alloc+0x70f/0xb70 [ 26.879017][ T305] __slab_alloc+0x5e/0xa0 [ 26.883369][ T305] __kmem_cache_alloc_node+0x204/0x2d0 [ 26.888842][ T305] kmalloc_trace+0x29/0xb0 [ 26.893263][ T305] dev_pm_qos_constraints_allocate+0x53/0x3f0 [ 26.899344][ T305] __dev_pm_qos_add_request+0x132/0x3e0 [ 26.904908][ T305] dev_pm_qos_add_request+0x37/0x50 [ 26.910113][ T305] usb_hub_create_port_device+0x4cb/0xbe0 [ 26.915842][ T305] hub_probe+0x205d/0x2c00 [ 26.920259][ T305] usb_probe_interface+0x621/0xb30 [ 26.925382][ T305] page_owner free stack trace missing [ 26.930757][ T305] [ 26.933091][ T305] Memory state around the buggy address: [ 26.938745][ T305] ffff88810de9a400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 26.946815][ T305] ffff88810de9a480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 26.954876][ T305] >ffff88810de9a500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb +++ exited with 0 +++ [ 26.962935][ T305]