ci2-android-6-1/strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ci2-android-6-1/syz-executor275860203 <...> Warning: Permanently added '10.128.0.249' (ED25519) to the list of known hosts. execve("ci2-android-6-1/syz-executor275860203", ["ci2-android-6-1/syz-executor275860203"], 0x7ffdf2f1e5a0 /* 10 vars */) = 0 brk(NULL) = 0x55557d61c000 brk(0x55557d61ce00) = 0x55557d61ce00 arch_prctl(ARCH_SET_FS, 0x55557d61c480) = 0 set_tid_address(0x55557d61c750) = 305 set_robust_list(0x55557d61c760, 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-executor275860203", 4096) = 43 getrandom("\x53\x69\x16\x2e\x8d\x8f\xf1\x49", 8, GRND_NONBLOCK) = 8 brk(NULL) = 0x55557d61ce00 brk(0x55557d63de00) = 0x55557d63de00 brk(0x55557d63e000) = 0x55557d63e000 mprotect(0x7f6b298b4000, 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=0x55557d61c750) = 306 rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0 openat(AT_FDCWD, "/sys/kernel/debug/x86/nmi_longest_ns", O_WRONLY|O_CLOEXEC) = 3 write(3, "10000000000", 11) = 11 close(3) = 0 openat(AT_FDCWD, "/proc/sys/kernel/hung_task_check_interval_secs", O_WRONLY|O_CLOEXEC) = 3 write(3, "20", 2) = 2 close(3) = 0 openat(AT_FDCWD, "/proc/sys/net/core/bpf_jit_kallsyms", O_WRONLY|O_CLOEXEC) = 3 write(3, "1", 1) = 1 close(3) = 0 openat(AT_FDCWD, "/proc/sys/net/core/bpf_jit_harden", O_WRONLY|O_CLOEXEC) = 3 write(3, "0", 1) = 1 close(3) = 0 openat(AT_FDCWD, "/proc/sys/kernel/kptr_restrict", O_WRONLY|O_CLOEXEC) = 3 write(3, "0", 1) = 1 close(3) = 0 openat(AT_FDCWD, "/proc/sys/kernel/softlockup_all_cpu_backtrace", O_WRONLY|O_CLOEXEC) = 3 write(3, "1", 1) = 1 close(3) = 0 openat(AT_FDCWD, "/proc/sys/fs/mount-max", O_WRONLY|O_CLOEXEC) = 3 write(3, "100", 3) = 3 close(3) = 0 openat(AT_FDCWD, "/proc/sys/vm/oom_dump_tasks", O_WRONLY|O_CLOEXEC) = 3 write(3, "0", 1) = 1 close(3) = 0 openat(AT_FDCWD, "/proc/sys/debug/exception-trace", O_WRONLY|O_CLOEXEC) = 3 write(3, "0", 1) = 1 close(3) = 0 openat(AT_FDCWD, "/proc/sys/kernel/printk", O_WRONLY|O_CLOEXEC) = 3 write(3, "7 4 1 3", 7) = 7 close(3) = 0 openat(AT_FDCWD, "/proc/sys/kernel/keys/gc_delay", O_WRONLY|O_CLOEXEC) = 3 write(3, "1", 1) = 1 close(3) = 0 openat(AT_FDCWD, "/proc/sys/vm/oom_kill_allocating_task", O_WRONLY|O_CLOEXEC) = 3 write(3, "1", 1) = 1 close(3) = 0 openat(AT_FDCWD, "/sys/kernel/debug/failslab/task-filter", O_WRONLY|O_CLOEXEC) = 3 write(3, "Y", 1) = 1 close(3) = 0 openat(AT_FDCWD, "/sys/kernel/debug/fail_page_alloc/task-filter", O_WRONLY|O_CLOEXEC) = 3 write(3, "Y", 1) = 1 close(3) = 0 openat(AT_FDCWD, "/sys/kernel/debug/fail_futex/task-filter", O_WRONLY|O_CLOEXEC) = 3 write(3, "Y", 1) = 1 close(3) = 0 openat(AT_FDCWD, "/sys/kernel/debug/fail_usercopy/task-filter", O_WRONLY|O_CLOEXEC) = 3 write(3, "Y", 1) = 1 close(3) = 0 openat(AT_FDCWD, "/sys/kernel/debug/fail_make_request/task-filter", O_WRONLY|O_CLOEXEC) = 3 write(3, "Y", 1) = 1 close(3) = 0 openat(AT_FDCWD, "/sys/kernel/debug/fail_io_timeout/task-filter", O_WRONLY|O_CLOEXEC) = 3 write(3, "Y", 1) = 1 close(3) = 0 openat(AT_FDCWD, "/sys/kernel/debug/fail_iommufd/task-filter", O_WRONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory) openat(AT_FDCWD, "/proc/sys/kernel/ctrl-alt-del", O_WRONLY|O_CLOEXEC) = 3 write(3, "0", 1) = 1 close(3) = 0 openat(AT_FDCWD, "/proc/sys/kernel/cad_pid", O_WRONLY|O_CLOEXEC) = 3 write(3, "306", 3) = 3 close(3) = 0 kill(306, SIGKILL) = 0 ci2-android-6-1/strace-static-x86_64: Process 306 attached [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=0x7f6b2980f0e0, sa_mask=[], sa_flags=SA_RESTORER|SA_NODEFER|SA_SIGINFO, sa_restorer=0x7f6b29811cb0}, NULL, 8) = 0 rt_sigaction(SIGBUS, {sa_handler=0x7f6b2980f0e0, sa_mask=[], sa_flags=SA_RESTORER|SA_NODEFER|SA_SIGINFO, sa_restorer=0x7f6b29811cb0}, NULL, 8) = 0 getrandom("\xff\xf2\x14\xc4\x70\x6d\x01\xd7", 8, GRND_NONBLOCK) = 8 mkdir("./syzkaller.hKkdJM", 0700) = 0 chmod("./syzkaller.hKkdJM", 0777) = 0 chdir("./syzkaller.hKkdJM") = 0 write(1, "executing program\n", 18) = 18 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\xac\x14\x14\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 ioctl(3, _IOC(_IOC_READ, 0x54, 0x14, 0x58), 0) = -1 ENOTTY (Inappropriate ioctl for device) executing program exit_group(0) = ? [ 23.315114][ T28] audit: type=1400 audit(1785814189.398:64): avc: denied { execmem } for pid=305 comm="syz-executor275" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1 [ 23.335342][ T28] audit: type=1400 audit(1785814189.408:65): avc: denied { create } for pid=305 comm="syz-executor275" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=pppox_socket permissive=1 [ 23.355407][ T28] audit: type=1400 audit(1785814189.408:66): avc: denied { connect } for pid=305 comm="syz-executor275" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=pppox_socket permissive=1 [ 23.375365][ T28] audit: type=1400 audit(1785814189.418:67): avc: denied { ioctl } for pid=305 comm="syz-executor275" path="socket:[7142]" dev="sockfs" ino=7142 ioctlcmd=0x5414 scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=pppox_socket permissive=1 [ 23.375399][ T305] ================================================================== [ 23.408341][ T305] BUG: KASAN: use-after-free in mutex_lock+0x86/0x1b0 [ 23.415121][ T305] Write of size 8 at addr ffff88810fc52550 by task syz-executor275/305 [ 23.423344][ T305] [ 23.425668][ T305] CPU: 1 PID: 305 Comm: syz-executor275 Not tainted syzkaller #0 [ 23.433729][ T305] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 [ 23.443901][ T305] Call Trace: [ 23.447175][ T305] [ 23.450093][ T305] __dump_stack+0x21/0x24 [ 23.454425][ T305] dump_stack_lvl+0x110/0x170 [ 23.459186][ T305] ? __cfi_dump_stack_lvl+0x8/0x8 [ 23.464293][ T305] ? mutex_lock+0x86/0x1b0 [ 23.468708][ T305] print_address_description+0x71/0x200 [ 23.474260][ T305] print_report+0x4a/0x60 [ 23.478618][ T305] kasan_report+0x122/0x150 [ 23.483120][ T305] ? mutex_lock+0x86/0x1b0 [ 23.487554][ T305] kasan_check_range+0x249/0x2a0 [ 23.492556][ T305] __kasan_check_write+0x14/0x20 [ 23.497488][ T305] mutex_lock+0x86/0x1b0 [ 23.501724][ T305] ? __cfi_mutex_lock+0x10/0x10 [ 23.506582][ T305] ? kfree+0x6f/0xf0 [ 23.510479][ T305] ? l2tp_session_put+0xaf/0x1a0 [ 23.515399][ T305] ? l2tp_session_delete+0x3df/0x4d0 [ 23.520972][ T305] pppol2tp_release+0x178/0x2b0 [ 23.525826][ T305] sock_close+0xc9/0x220 [ 23.530122][ T305] ? __cfi_sock_close+0x10/0x10 [ 23.534974][ T305] __fput+0x1fd/0x8f0 [ 23.538991][ T305] ____fput+0x15/0x20 [ 23.542979][ T305] task_work_run+0x1e1/0x250 [ 23.547570][ T305] ? __cfi_task_work_run+0x10/0x10 [ 23.552931][ T305] ? __kasan_check_write+0x14/0x20 [ 23.558129][ T305] do_exit+0xaf2/0x2850 [ 23.562291][ T305] ? ptrace_stop+0x6dc/0x8e0 [ 23.566885][ T305] ? __cfi_do_exit+0x10/0x10 [ 23.571472][ T305] ? __kasan_check_write+0x14/0x20 [ 23.576589][ T305] ? _raw_spin_lock_irq+0x95/0xf0 [ 23.581636][ T305] ? __cfi__raw_spin_lock_irq+0x10/0x10 [ 23.587268][ T305] ? zap_other_threads+0x2c1/0x2f0 [ 23.592378][ T305] do_group_exit+0x21b/0x2e0 [ 23.597145][ T305] __x64_sys_exit_group+0x3f/0x40 [ 23.602182][ T305] x64_sys_call+0x7b4/0x9a0 [ 23.606850][ T305] do_syscall_64+0x4c/0xa0 [ 23.611258][ T305] ? clear_bhb_loop+0x30/0x80 [ 23.615914][ T305] ? clear_bhb_loop+0x30/0x80 [ 23.620587][ T305] entry_SYSCALL_64_after_hwframe+0x68/0xd2 [ 23.626466][ T305] RIP: 0033:0x7f6b2981fe05 [ 23.630987][ T305] Code: Unable to access opcode bytes at 0x7f6b2981fddb. [ 23.638004][ T305] RSP: 002b:00007fffb7788458 EFLAGS: 00000206 ORIG_RAX: 00000000000000e7 [ 23.646407][ T305] RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 00007f6b2981fe05 [ 23.654369][ T305] RDX: 00000000000000e7 RSI: ffffffffffffffd8 RDI: 0000000000000000 [ 23.662335][ T305] RBP: 0000000000000000 R08: 0000000000000000 R09: 6c616b7a79732f2e [ 23.670465][ T305] R10: 6c616b7a79732f2e R11: 0000000000000206 R12: 0000000000000000 [ 23.678421][ T305] R13: 00007f6b298b9110 R14: 00007f6b298bb408 R15: 00007f6b298bb420 [ 23.686380][ T305] [ 23.689383][ T305] [ 23.691859][ T305] Allocated by task 305: [ 23.696079][ T305] kasan_set_track+0x4b/0x70 [ 23.700757][ T305] kasan_save_alloc_info+0x1f/0x30 [ 23.705859][ T305] __kasan_kmalloc+0x95/0xb0 [ 23.710459][ T305] __kmalloc+0xb4/0x1e0 [ 23.714692][ T305] l2tp_session_create+0x38/0xbd0 [ 23.719711][ T305] pppol2tp_connect+0xbf5/0x1640 [ 23.724641][ T305] __sys_connect+0x3da/0x460 [ 23.729237][ T305] __x64_sys_connect+0x7a/0x90 [ 23.734024][ T305] x64_sys_call+0x88d/0x9a0 [ 23.738519][ T305] do_syscall_64+0x4c/0xa0 [ 23.742927][ T305] entry_SYSCALL_64_after_hwframe+0x68/0xd2 [ 23.748814][ T305] [ 23.751122][ T305] Freed by task 305: [ 23.754993][ T305] kasan_set_track+0x4b/0x70 [ 23.759593][ T305] kasan_save_free_info+0x2b/0x40 [ 23.764611][ T305] ____kasan_slab_free+0x132/0x180 [ 23.769712][ T305] __kasan_slab_free+0x11/0x20 [ 23.774467][ T305] slab_free_freelist_hook+0xc2/0x190 [ 23.779914][ T305] __kmem_cache_free+0xb7/0x1b0 [ 23.784756][ T305] kfree+0x6f/0xf0 [ 23.788563][ T305] l2tp_session_put+0xaf/0x1a0 [ 23.793588][ T305] l2tp_session_delete+0x3df/0x4d0 [ 23.798699][ T305] pppol2tp_release+0x169/0x2b0 [ 23.803553][ T305] sock_close+0xc9/0x220 [ 23.807813][ T305] __fput+0x1fd/0x8f0 [ 23.811788][ T305] ____fput+0x15/0x20 [ 23.815759][ T305] task_work_run+0x1e1/0x250 [ 23.820345][ T305] do_exit+0xaf2/0x2850 [ 23.824492][ T305] do_group_exit+0x21b/0x2e0 [ 23.829076][ T305] __x64_sys_exit_group+0x3f/0x40 [ 23.834106][ T305] x64_sys_call+0x7b4/0x9a0 [ 23.838606][ T305] do_syscall_64+0x4c/0xa0 [ 23.843014][ T305] entry_SYSCALL_64_after_hwframe+0x68/0xd2 [ 23.848939][ T305] [ 23.851247][ T305] The buggy address belongs to the object at ffff88810fc52400 [ 23.851247][ T305] which belongs to the cache kmalloc-512 of size 512 [ 23.865284][ T305] The buggy address is located 336 bytes inside of [ 23.865284][ T305] 512-byte region [ffff88810fc52400, ffff88810fc52600) [ 23.878811][ T305] [ 23.881127][ T305] The buggy address belongs to the physical page: [ 23.887536][ T305] page:ffffea00043f1400 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10fc50 [ 23.897867][ T305] head:ffffea00043f1400 order:2 compound_mapcount:0 compound_pincount:0 [ 23.906191][ T305] flags: 0x4000000000010200(slab|head|zone=1) [ 23.912267][ T305] raw: 4000000000010200 ffffea0004415400 dead000000000002 ffff888100042f00 [ 23.923147][ T305] raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000 [ 23.931722][ T305] page dumped because: kasan: bad access detected [ 23.938135][ T305] page_owner tracks the page as allocated [ 23.943845][ 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 4277553610, free_ts 0 [ 23.963375][ T305] post_alloc_hook+0x1f5/0x210 [ 23.968144][ T305] prep_new_page+0x1c/0x110 [ 23.972644][ T305] get_page_from_freelist+0x2ca9/0x2d20 [ 23.978190][ T305] __alloc_pages+0x1fa/0x610 [ 23.982784][ T305] alloc_slab_page+0x6e/0xf0 [ 23.987386][ T305] new_slab+0x98/0x3e0 [ 23.991457][ T305] ___slab_alloc+0x70f/0xb70 [ 23.996041][ T305] __slab_alloc+0x5e/0xa0 [ 24.000361][ T305] __kmem_cache_alloc_node+0x204/0x2d0 [ 24.005986][ T305] __kmalloc_node_track_caller+0xa1/0x1e0 [ 24.011722][ T305] __alloc_skb+0x226/0x4a0 [ 24.016351][ T305] alloc_skb_with_frags+0xa8/0x620 [ 24.021449][ T305] sock_alloc_send_pskb+0x87f/0x9a0 [ 24.026662][ T305] unix_dgram_sendmsg+0x5c1/0x1710 [ 24.031766][ T305] __sys_sendto+0x4ac/0x660 [ 24.036256][ T305] __x64_sys_sendto+0xe5/0x100 [ 24.041008][ T305] page_owner free stack trace missing [ 24.046428][ T305] [ 24.048754][ T305] Memory state around the buggy address: [ 24.054381][ T305] ffff88810fc52400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 24.062446][ T305] ffff88810fc52480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 24.070515][ T305] >ffff88810fc52500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 24.078582][ T305] ^ [ 24.085251][ T305] ffff88810fc52580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 24.093316][ T305] ffff88810fc52600: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 24.101364][ T305] ================================================================== [ 24.109751][ T305] Disabling lock debugging due to kernel taint +++ exited with 0 +++ [ 24.114208][ T28] audit: typ