ci2-android-6-1/strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ci2-android-6-1/syz-executor3470728094 <...> rocess permissive=1 [ 11.501564][ T28] audit: type=1400 audit(1786194528.212:63): avc: denied { siginh } for pid=222 comm="sh" scontext=system_u:system_r:sshd_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1 Warning: Permanently added '10.128.0.113' (ED25519) to the list of known hosts. execve("ci2-android-6-1/syz-executor3470728094", ["ci2-android-6-1/syz-executor3470728094"], 0x7ffda3ba2020 /* 10 vars */) = 0 brk(NULL) = 0x55555de16000 brk(0x55555de16e00) = 0x55555de16e00 arch_prctl(ARCH_SET_FS, 0x55555de16480) = 0 set_tid_address(0x55555de16750) = 305 set_robust_list(0x55555de16760, 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-executor3470728094", 4096) = 44 getrandom("\x32\x8c\xe7\x88\x70\xfb\x5d\xcc", 8, GRND_NONBLOCK) = 8 brk(NULL) = 0x55555de16e00 brk(0x55555de37e00) = 0x55555de37e00 brk(0x55555de38000) = 0x55555de38000 mprotect(0x7f6378b1c000, 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=0x55555de16750) = 306 ci2-android-6-1/strace-static-x86_64: Process 306 attached [pid 305] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0 [pid 305] openat(AT_FDCWD, "/sys/kernel/debug/x86/nmi_longest_ns", O_WRONLY|O_CLOEXEC [pid 306] set_robust_list(0x55555de16760, 24) = 0 [pid 306] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0 [pid 305] <... openat resumed>) = 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=0x7f6378a77040, sa_mask=[], sa_flags=SA_RESTORER|SA_NODEFER|SA_SIGINFO, sa_restorer=0x7f6378a79c10}, NULL, 8) = 0 rt_sigaction(SIGBUS, {sa_handler=0x7f6378a77040, sa_mask=[], sa_flags=SA_RESTORER|SA_NODEFER|SA_SIGINFO, sa_restorer=0x7f6378a79c10}, NULL, 8) = 0 getrandom("\x6a\x30\xe7\xb6\x87\xb4\x99\x54", 8, GRND_NONBLOCK) = 8 mkdir("./syzkaller.ypqIYB", 0700) = 0 chmod("./syzkaller.ypqIYB", 0777) = 0 chdir("./syzkaller.ypqIYB") = 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\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"}, 46) = 0 [ 20.683340][ T28] audit: type=1400 audit(1786194537.412:64): avc: denied { execmem } for pid=305 comm="syz-executor347" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1 ioctl(3, SIOCGIFINDEX, NULL) = -1 EFAULT (Bad address) exit_group(0) = ? [ 20.714610][ T28] audit: type=1400 audit(1786194537.442:65): avc: denied { create } for pid=305 comm="syz-executor347" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=pppox_socket permissive=1 [ 20.735074][ T28] audit: type=1400 audit(1786194537.442:66): avc: denied { connect } for pid=305 comm="syz-executor347" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=pppox_socket permissive=1 [ 20.755618][ T28] audit: type=1400 audit(1786194537.462:67): avc: denied { ioctl } for pid=305 comm="syz-executor347" path="socket:[14933]" dev="sockfs" ino=14933 ioctlcmd=0x8933 scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=pppox_socket permissive=1 [ 20.755697][ T305] ================================================================== [ 20.780591][ T305] BUG: KASAN: use-after-free in mutex_lock+0x86/0x1b0 [ 20.780650][ T305] Write of size 8 at addr ffff88810ffd6150 by task syz-executor347/305 [ 20.780663][ T305] [ 20.780671][ T305] CPU: 1 PID: 305 Comm: syz-executor347 Not tainted syzkaller #0 [ 20.780686][ T305] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 [ 20.780701][ T305] Call Trace: [ 20.780705][ T305] [ 20.780711][ T305] __dump_stack+0x21/0x24 [ 20.780730][ T305] dump_stack_lvl+0x110/0x170 [ 20.839080][ T305] ? __cfi_dump_stack_lvl+0x8/0x8 [ 20.844195][ T305] ? mutex_lock+0x86/0x1b0 [ 20.848698][ T305] print_address_description+0x71/0x200 [ 20.854221][ T305] print_report+0x4a/0x60 [ 20.858526][ T305] kasan_report+0x122/0x150 [ 20.863011][ T305] ? mutex_lock+0x86/0x1b0 [ 20.867410][ T305] kasan_check_range+0x249/0x2a0 [ 20.872330][ T305] __kasan_check_write+0x14/0x20 [ 20.877244][ T305] mutex_lock+0x86/0x1b0 [ 20.881466][ T305] ? __cfi_mutex_lock+0x10/0x10 [ 20.886292][ T305] ? kfree+0x6f/0xf0 [ 20.890182][ T305] ? l2tp_session_put+0xaf/0x1a0 [ 20.895096][ T305] ? l2tp_session_delete+0x3df/0x4d0 [ 20.900451][ T305] pppol2tp_release+0x178/0x2b0 [ 20.905278][ T305] sock_close+0xc9/0x220 [ 20.909499][ T305] ? __cfi_sock_close+0x10/0x10 [ 20.914333][ T305] __fput+0x1fd/0x8f0 [ 20.918322][ T305] ____fput+0x15/0x20 [ 20.922279][ T305] task_work_run+0x1e1/0x250 [ 20.926847][ T305] ? __cfi_task_work_run+0x10/0x10 [ 20.931942][ T305] ? __kasan_check_write+0x14/0x20 [ 20.937032][ T305] do_exit+0xaf2/0x2850 [ 20.941188][ T305] ? ptrace_stop+0x6dc/0x8e0 [ 20.945758][ T305] ? __cfi_do_exit+0x10/0x10 [ 20.950334][ T305] ? __kasan_check_write+0x14/0x20 [ 20.955479][ T305] ? _raw_spin_lock_irq+0x95/0xf0 [ 20.960500][ T305] ? __cfi__raw_spin_lock_irq+0x10/0x10 [ 20.966039][ T305] ? zap_other_threads+0x2c1/0x2f0 [ 20.971136][ T305] do_group_exit+0x21b/0x2e0 [ 20.975723][ T305] __x64_sys_exit_group+0x3f/0x40 [ 20.980733][ T305] x64_sys_call+0x7b4/0x9a0 [ 20.985226][ T305] do_syscall_64+0x4c/0xa0 [ 20.989622][ T305] ? clear_bhb_loop+0x30/0x80 [ 20.994275][ T305] ? clear_bhb_loop+0x30/0x80 [ 20.998930][ T305] entry_SYSCALL_64_after_hwframe+0x68/0xd2 [ 21.004913][ T305] RIP: 0033:0x7f6378a87d45 [ 21.009331][ T305] Code: Unable to access opcode bytes at 0x7f6378a87d1b. [ 21.016372][ T305] RSP: 002b:00007ffff7c844c8 EFLAGS: 00000206 ORIG_RAX: 00000000000000e7 [ 21.024784][ T305] RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 00007f6378a87d45 [ 21.032740][ T305] RDX: 00000000000000e7 RSI: ffffffffffffffd8 RDI: 0000000000000000 [ 21.040691][ T305] RBP: 0000000000000000 R08: 0000000000000000 R09: 6c616b7a79732f2e [ 21.048737][ T305] R10: 6c616b7a79732f2e R11: 0000000000000206 R12: 0000000000000000 [ 21.056691][ T305] R13: 00007f6378b21110 R14: 00007f6378b23408 R15: 00007f6378b23420 [ 21.064647][ T305] [ 21.067646][ T305] [ 21.069947][ T305] Allocated by task 305: [ 21.074160][ T305] kasan_set_track+0x4b/0x70 [ 21.078732][ T305] kasan_save_alloc_info+0x1f/0x30 [ 21.083827][ T305] __kasan_kmalloc+0x95/0xb0 [ 21.088403][ T305] __kmalloc+0xb4/0x1e0 [ 21.092530][ T305] l2tp_session_create+0x38/0xbd0 [ 21.097529][ T305] pppol2tp_connect+0xbf5/0x1640 [ 21.102474][ T305] __sys_connect+0x3da/0x460 [ 21.107056][ T305] __x64_sys_connect+0x7a/0x90 [ 21.111793][ T305] x64_sys_call+0x88d/0x9a0 [ 21.116288][ T305] do_syscall_64+0x4c/0xa0 [ 21.120681][ T305] entry_SYSCALL_64_after_hwframe+0x68/0xd2 [ 21.126552][ T305] [ 21.128849][ T305] Freed by task 305: [ 21.132715][ T305] kasan_set_track+0x4b/0x70 [ 21.137281][ T305] kasan_save_free_info+0x2b/0x40 [ 21.142282][ T305] ____kasan_slab_free+0x132/0x180 [ 21.147366][ T305] __kasan_slab_free+0x11/0x20 [ 21.152107][ T305] slab_free_freelist_hook+0xc2/0x190 [ 21.157464][ T305] __kmem_cache_free+0xb7/0x1b0 [ 21.162306][ T305] kfree+0x6f/0xf0 [ 21.166008][ T305] l2tp_session_put+0xaf/0x1a0 [ 21.170765][ T305] l2tp_session_delete+0x3df/0x4d0 [ 21.175856][ T305] pppol2tp_release+0x169/0x2b0 [ 21.180685][ T305] sock_close+0xc9/0x220 [ 21.184909][ T305] __fput+0x1fd/0x8f0 [ 21.188871][ T305] ____fput+0x15/0x20 [ 21.192835][ T305] task_work_run+0x1e1/0x250 [ 21.197402][ T305] do_exit+0xaf2/0x2850 [ 21.201541][ T305] do_group_exit+0x21b/0x2e0 [ 21.206293][ T305] __x64_sys_exit_group+0x3f/0x40 [ 21.211305][ T305] x64_sys_call+0x7b4/0x9a0 [ 21.215803][ T305] do_syscall_64+0x4c/0xa0 [ 21.220200][ T305] entry_SYSCALL_64_after_hwframe+0x68/0xd2 [ 21.226070][ T305] [ 21.228372][ T305] The buggy address belongs to the object at ffff88810ffd6000 [ 21.228372][ T305] which belongs to the cache kmalloc-512 of size 512 [ 21.242398][ T305] The buggy address is located 336 bytes inside of [ 21.242398][ T305] 512-byte region [ffff88810ffd6000, ffff88810ffd6200) [ 21.255676][ T305] [ 21.257990][ T305] The buggy address belongs to the physical page: [ 21.264389][ T305] page:ffffea00043ff500 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10ffd4 [ 21.274614][ T305] head:ffffea00043ff500 order:2 compound_mapcount:0 compound_pincount:0 [ 21.282915][ T305] flags: 0x4000000000010200(slab|head|zone=1) [ 21.289000][ T305] raw: 4000000000010200 0000000000000000 dead000000000001 ffff888100042f00 [ 21.297575][ T305] raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000 [ 21.306138][ T305] page dumped because: kasan: bad access detected [ 21.312530][ T305] page_owner tracks the page as allocated [ 21.318234][ 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 92, tgid 92 (klogd), ts 3697322209, free_ts 0 [ 21.337665][ T305] post_alloc_hook+0x1f5/0x210 [ 21.342419][ T305] prep_new_page+0x1c/0x110 [ 21.346918][ T305] get_page_from_freelist+0x2ca9/0x2d20 [ 21.352925][ T305] __alloc_pages+0x1fa/0x610 [ 21.357623][ T305] alloc_slab_page+0x6e/0xf0 [ 21.362209][ T305] new_slab+0x98/0x3e0 [ 21.366259][ T305] ___slab_alloc+0x70f/0xb70 [ 21.370922][ T305] __slab_alloc+0x5e/0xa0 [ 21.375240][ T305] __kmem_cache_alloc_node+0x204/0x2d0 [ 21.380776][ T305] __kmalloc_node_track_caller+0xa1/0x1e0 [ 21.386475][ T305] __alloc_skb+0x226/0x4a0 [ 21.390872][ T305] alloc_skb_with_frags+0xa8/0x620 [ 21.395968][ T305] sock_alloc_send_pskb+0x87f/0x9a0 [ 21.401237][ T305] unix_dgram_sendmsg+0x5c1/0x1710 [ 21.406507][ T305] __sys_sendto+0x4ac/0x660 [ 21.411008][ T305] __x64_sys_sendto+0xe5/0x100 [ 21.415756][ T305] page_owner free stack trace missing [ 21.421106][ T305] [ 21.423410][ T305] Memory state around the buggy address: [ 21.429017][ T305] ffff88810ffd6000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 21.437318][ T305] ffff88810ffd6080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 21.445449][ T305] >ffff88810ffd6100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 21.453508][ T305] ^ [ 21.460155][ T305] ffff88810ffd6180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 21.468219][ T305] ffff88810ffd6200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 21.476257][ T305] ================================================================== +++ exited with 0 +++ [ 21.484495][ T305] Disa