ci2-android-5-10/strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ci2-android-5-10/syz-executor1920506834 <...> Warning: Permanently added '10.128.1.67' (ED25519) to the list of known hosts. execve("ci2-android-5-10/syz-executor1920506834", ["ci2-android-5-10/syz-executor1920506834"], 0x7ffcfd307820 /* 10 vars */) = 0 brk(NULL) = 0x55557b76b000 brk(0x55557b76be00) = 0x55557b76be00 arch_prctl(ARCH_SET_FS, 0x55557b76b480) = 0 set_tid_address(0x55557b76b750) = 297 set_robust_list(0x55557b76b760, 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-5-10/syz-executor1920506834", 4096) = 45 getrandom("\xf5\xd3\x36\xa2\x3c\x05\x1b\xda", 8, GRND_NONBLOCK) = 8 brk(NULL) = 0x55557b76be00 brk(0x55557b78ce00) = 0x55557b78ce00 brk(0x55557b78d000) = 0x55557b78d000 mprotect(0x7fd01d7c4000, 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=0x55557b76b750) = 298 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(3ci2-android-5-10/strace-static-x86_64: Process 298 attached ) = 0 [pid 297] openat(AT_FDCWD, "/proc/sys/kernel/softlockup_all_cpu_backtrace", O_WRONLY|O_CLOEXEC) = 3 [pid 298] set_robust_list(0x55557b76b760, 24 [pid 297] write(3, "1", 1 [pid 298] <... set_robust_list resumed>) = 0 [pid 297] <... write resumed>) = 1 [pid 297] close(3 [pid 298] rt_sigprocmask(SIG_SETMASK, [] [pid 297] <... close resumed>) = 0 [pid 298] <... rt_sigprocmask resumed>, NULL, 8) = 0 [pid 297] openat(AT_FDCWD, "/proc/sys/fs/mount-max", O_WRONLY|O_CLOEXEC) = 3 [pid 297] write(3, "100", 3) = 3 [pid 297] close(3) = 0 [pid 297] openat(AT_FDCWD, "/proc/sys/vm/oom_dump_tasks", O_WRONLY|O_CLOEXEC) = 3 [pid 297] write(3, "0", 1) = 1 [pid 297] close(3) = 0 [pid 297] openat(AT_FDCWD, "/proc/sys/debug/exception-trace", O_WRONLY|O_CLOEXEC) = 3 [pid 297] write(3, "0", 1) = 1 [pid 297] close(3) = 0 [pid 297] openat(AT_FDCWD, "/proc/sys/kernel/printk", O_WRONLY|O_CLOEXEC) = 3 [pid 297] write(3, "7 4 1 3", 7) = 7 [pid 297] close(3) = 0 [pid 297] openat(AT_FDCWD, "/proc/sys/kernel/keys/gc_delay", O_WRONLY|O_CLOEXEC) = 3 [pid 297] write(3, "1", 1) = 1 [pid 297] close(3) = 0 [pid 297] openat(AT_FDCWD, "/proc/sys/vm/oom_kill_allocating_task", O_WRONLY|O_CLOEXEC) = 3 [pid 297] write(3, "1", 1) = 1 [pid 297] close(3) = 0 [pid 297] openat(AT_FDCWD, "/sys/kernel/debug/failslab/task-filter", O_WRONLY|O_CLOEXEC) = 3 [pid 297] write(3, "Y", 1) = 1 [pid 297] close(3) = 0 [pid 297] openat(AT_FDCWD, "/sys/kernel/debug/fail_page_alloc/task-filter", O_WRONLY|O_CLOEXEC) = 3 [pid 297] write(3, "Y", 1) = 1 [pid 297] close(3) = 0 [pid 297] openat(AT_FDCWD, "/sys/kernel/debug/fail_futex/task-filter", O_WRONLY|O_CLOEXEC) = 3 [pid 297] write(3, "Y", 1) = 1 [pid 297] close(3) = 0 [pid 297] openat(AT_FDCWD, "/sys/kernel/debug/fail_usercopy/task-filter", O_WRONLY|O_CLOEXEC) = 3 [pid 297] write(3, "Y", 1) = 1 [pid 297] close(3) = 0 [pid 297] openat(AT_FDCWD, "/sys/kernel/debug/fail_make_request/task-filter", O_WRONLY|O_CLOEXEC) = 3 [pid 297] write(3, "Y", 1) = 1 [pid 297] close(3) = 0 [pid 297] openat(AT_FDCWD, "/sys/kernel/debug/fail_io_timeout/task-filter", O_WRONLY|O_CLOEXEC) = 3 [pid 297] write(3, "Y", 1) = 1 [pid 297] close(3) = 0 [pid 297] openat(AT_FDCWD, "/sys/kernel/debug/fail_iommufd/task-filter", O_WRONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory) [pid 297] openat(AT_FDCWD, "/proc/sys/kernel/ctrl-alt-del", O_WRONLY|O_CLOEXEC) = 3 [pid 297] write(3, "0", 1) = 1 [pid 297] close(3) = 0 [pid 297] openat(AT_FDCWD, "/proc/sys/kernel/cad_pid", O_WRONLY|O_CLOEXEC) = 3 [pid 297] write(3, "298", 3) = 3 [pid 297] close(3) = 0 [pid 297] kill(298, SIGKILL) = 0 [pid 298] +++ killed by SIGKILL +++ --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_KILLED, si_pid=298, 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=0x7fd01d720080, sa_mask=[], sa_flags=SA_RESTORER|SA_NODEFER|SA_SIGINFO, sa_restorer=0x7fd01d722c50}, NULL, 8) = 0 rt_sigaction(SIGBUS, {sa_handler=0x7fd01d720080, sa_mask=[], sa_flags=SA_RESTORER|SA_NODEFER|SA_SIGINFO, sa_restorer=0x7fd01d722c50}, NULL, 8) = 0 write(1, "executing program\n", 18) = 18 executing program socket(AF_PPPOX, SOCK_STREAM, 1) = 3 [ 29.898129][ T24] audit: type=1400 audit(1788380941.530:64): avc: denied { execmem } for pid=297 comm="syz-executor192" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1 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, PPPIOCGL2TPSTATS, 0) = -1 EFAULT (Bad address) exit_group(0) = ? [ 29.936113][ T24] audit: type=1400 audit(1788380941.570:65): avc: denied { create } for pid=297 comm="syz-executor192" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=pppox_socket permissive=1 [ 29.956160][ T24] audit: type=1400 audit(1788380941.580:66): avc: denied { connect } for pid=297 comm="syz-executor192" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=pppox_socket permissive=1 [ 29.976802][ T24] audit: type=1400 audit(1788380941.610:67): avc: denied { ioctl } for pid=297 comm="syz-executor192" path="socket:[14575]" dev="sockfs" ino=14575 ioctlcmd=0x7436 scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=pppox_socket permissive=1 [ 30.003388][ T297] ================================================================== [ 30.011532][ T297] BUG: KASAN: use-after-free in mutex_lock+0x85/0xf0 [ 30.018477][ T297] Write of size 8 at addr ffff88811def8150 by task syz-executor192/297 [ 30.026724][ T297] [ 30.029074][ T297] CPU: 0 PID: 297 Comm: syz-executor192 Not tainted syzkaller #0 [ 30.036928][ T297] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 [ 30.047005][ T297] Call Trace: [ 30.050324][ T297] __dump_stack+0x21/0x24 [ 30.054914][ T297] dump_stack_lvl+0x1a7/0x208 [ 30.059603][ T297] ? show_regs_print_info+0x18/0x18 [ 30.064855][ T297] ? thaw_kernel_threads+0x220/0x220 [ 30.070143][ T297] print_address_description+0x7f/0x2c0 [ 30.075688][ T297] ? mutex_lock+0x85/0xf0 [ 30.080017][ T297] kasan_report+0x100/0x140 [ 30.084520][ T297] ? mutex_lock+0x85/0xf0 [ 30.088935][ T297] kasan_check_range+0x249/0x2a0 [ 30.093970][ T297] __kasan_check_write+0x14/0x20 [ 30.098954][ T297] mutex_lock+0x85/0xf0 [ 30.103428][ T297] ? mutex_trylock+0xb0/0xb0 [ 30.108022][ T297] ? l2tp_session_put+0xb2/0x1a0 [ 30.112984][ T297] ? l2tp_session_delete+0x3a9/0x4a0 [ 30.118269][ T297] pppol2tp_release+0x178/0x2b0 [ 30.123387][ T297] sock_close+0xb8/0x200 [ 30.127631][ T297] ? sock_mmap+0xa0/0xa0 [ 30.131971][ T297] __fput+0x2dc/0x730 [ 30.135953][ T297] ? _raw_spin_lock+0x94/0xf0 [ 30.140638][ T297] ____fput+0x15/0x20 [ 30.144976][ T297] task_work_run+0x127/0x190 [ 30.149566][ T297] do_exit+0xa7c/0x24e0 [ 30.153744][ T297] ? ptrace_notify+0x1ea/0x270 [ 30.158508][ T297] ? put_task_struct+0x90/0x90 [ 30.163273][ T297] ? do_notify_parent+0x810/0x810 [ 30.168299][ T297] do_group_exit+0x149/0x310 [ 30.172887][ T297] __x64_sys_exit_group+0x3f/0x40 [ 30.177994][ T297] do_syscall_64+0x31/0x40 [ 30.182501][ T297] entry_SYSCALL_64_after_hwframe+0x61/0xcb [ 30.188414][ T297] RIP: 0033:0x7fd01d730d85 [ 30.192937][ T297] Code: Unable to access opcode bytes at RIP 0x7fd01d730d5b. [ 30.200300][ T297] RSP: 002b:00007ffda4da24b8 EFLAGS: 00000206 ORIG_RAX: 00000000000000e7 [ 30.208789][ T297] RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 00007fd01d730d85 [ 30.216887][ T297] RDX: 00000000000000e7 RSI: ffffffffffffffd8 RDI: 0000000000000000 [ 30.224868][ T297] RBP: 0000000000000000 R08: 0000000000000000 R09: 00007fd01d720080 [ 30.232846][ T297] R10: 00007fd01d720080 R11: 0000000000000206 R12: 0000000000000000 [ 30.240987][ T297] R13: 00007fd01d7c9110 R14: 00007fd01d7cb408 R15: 00007fd01d7cb420 [ 30.248967][ T297] [ 30.251321][ T297] Allocated by task 297: [ 30.255689][ T297] __kasan_kmalloc+0xd4/0x100 [ 30.260401][ T297] __kmalloc+0x19f/0x330 [ 30.264905][ T297] l2tp_session_create+0x39/0xb60 [ 30.269932][ T297] pppol2tp_connect+0xbf5/0x1640 [ 30.274918][ T297] __sys_connect+0x3ce/0x450 [ 30.279638][ T297] __x64_sys_connect+0x7a/0x90 [ 30.284416][ T297] do_syscall_64+0x31/0x40 [ 30.288841][ T297] entry_SYSCALL_64_after_hwframe+0x61/0xcb [ 30.294738][ T297] [ 30.297102][ T297] Freed by task 297: [ 30.301004][ T297] kasan_set_track+0x4a/0x70 [ 30.305598][ T297] kasan_set_free_info+0x23/0x40 [ 30.310560][ T297] ____kasan_slab_free+0x125/0x160 [ 30.315695][ T297] __kasan_slab_free+0x11/0x20 [ 30.320990][ T297] slab_free_freelist_hook+0xc5/0x190 [ 30.327153][ T297] kfree+0xc0/0x270 [ 30.330972][ T297] l2tp_session_put+0xb2/0x1a0 [ 30.335741][ T297] l2tp_session_delete+0x3a9/0x4a0 [ 30.340861][ T297] pppol2tp_release+0x169/0x2b0 [ 30.345717][ T297] sock_close+0xb8/0x200 [ 30.349971][ T297] __fput+0x2dc/0x730 [ 30.353963][ T297] ____fput+0x15/0x20 [ 30.358054][ T297] task_work_run+0x127/0x190 [ 30.362677][ T297] do_exit+0xa7c/0x24e0 [ 30.366857][ T297] do_group_exit+0x149/0x310 [ 30.371463][ T297] __x64_sys_exit_group+0x3f/0x40 [ 30.376502][ T297] do_syscall_64+0x31/0x40 [ 30.380933][ T297] entry_SYSCALL_64_after_hwframe+0x61/0xcb [ 30.386847][ T297] [ 30.389328][ T297] The buggy address belongs to the object at ffff88811def8000 [ 30.389328][ T297] which belongs to the cache kmalloc-512 of size 512 [ 30.403390][ T297] The buggy address is located 336 bytes inside of [ 30.403390][ T297] 512-byte region [ffff88811def8000, ffff88811def8200) [ 30.416665][ T297] The buggy address belongs to the page: [ 30.422355][ T297] page:ffffea000477be00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11def8 [ 30.432595][ T297] head:ffffea000477be00 order:2 compound_mapcount:0 compound_pincount:0 [ 30.440924][ T297] flags: 0x4000000000010200(slab|head) [ 30.446411][ T297] raw: 4000000000010200 dead000000000100 dead000000000122 ffff888100043080 [ 30.455018][ T297] raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000 [ 30.463616][ T297] page dumped because: kasan: bad access detected [ 30.470040][ T297] page_owner tracks the page as allocated [ 30.475776][ T297] page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 293, ts 29813996591, free_ts 23662110846 [ 30.494791][ T297] prep_new_page+0x176/0x190 [ 30.499393][ T297] get_page_from_freelist+0x225f/0x23f0 [ 30.504952][ T297] __alloc_pages_nodemask+0x29a/0x640 [ 30.510333][ T297] new_slab+0x84/0x3f0 [ 30.514409][ T297] ___slab_alloc+0x2f8/0x4c0 [ 30.519007][ T297] __slab_alloc+0x63/0xa0 [ 30.523345][ T297] __kmalloc_track_caller+0x1e4/0x310 [ 30.528724][ T297] __alloc_skb+0xdc/0x520 [ 30.533057][ T297] alloc_skb_with_frags+0xa3/0x560 [ 30.538248][ T297] sock_alloc_send_pskb+0x87f/0x9a0 [ 30.543554][ T297] unix_stream_sendmsg+0x4c9/0xbe0 [ 30.548683][ T297] sock_write_iter+0x2a6/0x3a0 [ 30.553704][ T297] vfs_write+0x770/0xd70 [ 30.557976][ T297] ksys_write+0x14a/0x260 [ 30.562345][ T297] __x64_sys_write+0x7b/0x90 [ 30.566964][ T297] do_syscall_64+0x31/0x40 [ 30.571422][ T297] page last free stack trace: [ 30.576114][ T297] free_unref_page_prepare+0x2b7/0x2d0 [ 30.581585][ T297] free_unref_page+0x7f/0x190 [ 30.586293][ T297] __put_page+0xae/0xe0 [ 30.590464][ T297] anon_pipe_buf_release+0x165/0x1f0 [ 30.595759][ T297] pipe_read+0x563/0x1050 [ 30.600222][ T297] vfs_read+0x62a/0xa50 [ 30.604404][ T297] ksys_read+0x14a/0x260 [ 30.608656][ T297] __x64_sys_read+0x7b/0x90 [ 30.613180][ T297] do_syscall_64+0x31/0x40 [ 30.617606][ T297] entry_SYSCALL_64_after_hwframe+0x61/0xcb [ 30.623498][ T297] [ 30.625840][ T297] Memory state around the buggy address: [ 30.631669][ T297] ffff88811def8000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 30.639735][ T297] ffff88811def8080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb +++ exited with 0 +++ [ 30.647897][ T297] >ffff88811def8100: fb