ci2-android-5-10/strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ci2-android-5-10/syz-executor1885537369 <...> Warning: Permanently added '10.128.0.228' (ED25519) to the list of known hosts. execve("ci2-android-5-10/syz-executor1885537369", ["ci2-android-5-10/syz-executor1885537369"], 0x7ffd73fa8a00 /* 10 vars */) = 0 brk(NULL) = 0x555581ca7000 brk(0x555581ca7d40) = 0x555581ca7d40 arch_prctl(ARCH_SET_FS, 0x555581ca73c0) = 0 set_tid_address(0x555581ca7690) = 297 set_robust_list(0x555581ca76a0, 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-executor1885537369", 4096) = 45 getrandom("\x80\xef\xfd\x40\xd7\x35\xea\x41", 8, GRND_NONBLOCK) = 8 brk(NULL) = 0x555581ca7d40 brk(0x555581cc8d40) = 0x555581cc8d40 brk(0x555581cc9000) = 0x555581cc9000 mprotect(0x7f8c1a01f000, 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=0x555581ca7690) = 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(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 ci2-android-5-10/strace-static-x86_64: Process 298 attached [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 [pid 298] set_robust_list(0x555581ca76a0, 24 [pid 297] <... close resumed>) = 0 [pid 297] openat(AT_FDCWD, "/proc/sys/kernel/printk", O_WRONLY|O_CLOEXEC [pid 298] <... set_robust_list resumed>) = 0 [pid 297] <... openat resumed>) = 3 [pid 297] write(3, "7 4 1 3", 7 [pid 298] rt_sigprocmask(SIG_SETMASK, [] [pid 297] <... write resumed>) = 7 [pid 297] close(3 [pid 298] <... rt_sigprocmask resumed>, NULL, 8) = 0 [pid 297] <... close resumed>) = 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} --- getrandom("\x5d\x11\xb7\x43\x75\x53\x96\x49", 8, GRND_NONBLOCK) = 8 mkdir("./syzkaller.9Ur7V5", 0700) = 0 chmod("./syzkaller.9Ur7V5", 0777) = 0 chdir("./syzkaller.9Ur7V5") = 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\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, BTRFS_IOC_DEV_INFO, NULL) = -1 ENOTTY (Inappropriate ioctl for device) [ 21.515027][ T24] audit: type=1400 audit(1791552230.480:64): avc: denied { execmem } for pid=297 comm="syz-executor188" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1 [ 21.544502][ T24] audit: type=1400 audit(1791552230.510:65): avc: denied { create } for pid=297 comm="syz-executor188" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=pppox_socket permissive=1 exit_group(0) = ? [ 21.564901][ T24] audit: type=1400 audit(1791552230.510:66): avc: denied { connect } for pid=297 comm="syz-executor188" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=pppox_socket permissive=1 [ 21.584863][ T297] ================================================================== [ 21.585185][ T24] audit: type=1400 audit(1791552230.530:67): avc: denied { ioctl } for pid=297 comm="syz-executor188" path="socket:[14483]" dev="sockfs" ino=14483 ioctlcmd=0x941e scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=pppox_socket permissive=1 [ 21.592957][ T297] BUG: KASAN: use-after-free in mutex_lock+0x85/0xf0 [ 21.624532][ T297] Write of size 8 at addr ffff88810b0d9150 by task syz-executor188/297 [ 21.632741][ T297] [ 21.635064][ T297] CPU: 1 PID: 297 Comm: syz-executor188 Not tainted syzkaller #0 [ 21.642899][ T297] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026 [ 21.652954][ T297] Call Trace: [ 21.656233][ T297] __dump_stack+0x21/0x24 [ 21.660539][ T297] dump_stack_lvl+0x1a7/0x208 [ 21.665189][ T297] ? show_regs_print_info+0x18/0x18 [ 21.670379][ T297] ? thaw_kernel_threads+0x220/0x220 [ 21.675657][ T297] print_address_description+0x7f/0x2c0 [ 21.681178][ T297] ? mutex_lock+0x85/0xf0 [ 21.685506][ T297] kasan_report+0x100/0x140 [ 21.689983][ T297] ? mutex_lock+0x85/0xf0 [ 21.694294][ T297] kasan_check_range+0x249/0x2a0 [ 21.699224][ T297] __kasan_check_write+0x14/0x20 [ 21.704134][ T297] mutex_lock+0x85/0xf0 [ 21.708263][ T297] ? mutex_trylock+0xb0/0xb0 [ 21.712826][ T297] ? l2tp_session_put+0xb2/0x1a0 [ 21.717736][ T297] ? l2tp_session_delete+0x3a9/0x4a0 [ 21.723023][ T297] pppol2tp_release+0x178/0x2b0 [ 21.727869][ T297] sock_close+0xb8/0x200 [ 21.732087][ T297] ? sock_mmap+0xa0/0xa0 [ 21.736310][ T297] __fput+0x2dc/0x730 [ 21.740267][ T297] ? _raw_spin_lock+0x94/0xf0 [ 21.744943][ T297] ____fput+0x15/0x20 [ 21.748908][ T297] task_work_run+0x127/0x190 [ 21.753475][ T297] do_exit+0xa7c/0x24e0 [ 21.757615][ T297] ? ptrace_notify+0x1ea/0x270 [ 21.762354][ T297] ? put_task_struct+0x90/0x90 [ 21.767115][ T297] ? do_notify_parent+0x810/0x810 [ 21.772129][ T297] do_group_exit+0x149/0x310 [ 21.776703][ T297] __x64_sys_exit_group+0x3f/0x40 [ 21.781725][ T297] do_syscall_64+0x31/0x40 [ 21.786116][ T297] entry_SYSCALL_64_after_hwframe+0x61/0xcb [ 21.791985][ T297] RIP: 0033:0x7f8c19f8aa85 [ 21.796470][ T297] Code: Unable to access opcode bytes at RIP 0x7f8c19f8aa5b. [ 21.803840][ T297] RSP: 002b:00007fffcf4a0638 EFLAGS: 00000202 ORIG_RAX: 00000000000000e7 [ 21.812225][ T297] RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 00007f8c19f8aa85 [ 21.820175][ T297] RDX: 00000000000000e7 RSI: ffffffffffffffd8 RDI: 0000000000000000 [ 21.828123][ T297] RBP: 0000000000000000 R08: 0000000000000000 R09: 6c616b7a79732f2e [ 21.836072][ T297] R10: 6c616b7a79732f2e R11: 0000000000000202 R12: 0000000000000000 [ 21.844028][ T297] R13: 00007f8c1a024110 R14: 00007f8c1a0263a8 R15: 00007f8c1a0263c0 [ 21.851983][ T297] [ 21.854287][ T297] Allocated by task 297: [ 21.858509][ T297] __kasan_kmalloc+0xd4/0x100 [ 21.863184][ T297] __kmalloc+0x19f/0x330 [ 21.867401][ T297] l2tp_session_create+0x39/0xb60 [ 21.872397][ T297] pppol2tp_connect+0xbf5/0x1640 [ 21.877310][ T297] __sys_connect+0x3ce/0x450 [ 21.881889][ T297] __x64_sys_connect+0x7a/0x90 [ 21.886626][ T297] do_syscall_64+0x31/0x40 [ 21.891039][ T297] entry_SYSCALL_64_after_hwframe+0x61/0xcb [ 21.896901][ T297] [ 21.899207][ T297] Freed by task 297: [ 21.903079][ T297] kasan_set_track+0x4a/0x70 [ 21.907645][ T297] kasan_set_free_info+0x23/0x40 [ 21.912570][ T297] ____kasan_slab_free+0x125/0x160 [ 21.917667][ T297] __kasan_slab_free+0x11/0x20 [ 21.922433][ T297] slab_free_freelist_hook+0xc5/0x190 [ 21.927784][ T297] kfree+0xc0/0x270 [ 21.931594][ T297] l2tp_session_put+0xb2/0x1a0 [ 21.936335][ T297] l2tp_session_delete+0x3a9/0x4a0 [ 21.941422][ T297] pppol2tp_release+0x169/0x2b0 [ 21.946252][ T297] sock_close+0xb8/0x200 [ 21.950474][ T297] __fput+0x2dc/0x730 [ 21.954703][ T297] ____fput+0x15/0x20 [ 21.958678][ T297] task_work_run+0x127/0x190 [ 21.963270][ T297] do_exit+0xa7c/0x24e0 [ 21.967409][ T297] do_group_exit+0x149/0x310 [ 21.971977][ T297] __x64_sys_exit_group+0x3f/0x40 [ 21.976983][ T297] do_syscall_64+0x31/0x40 [ 21.981390][ T297] entry_SYSCALL_64_after_hwframe+0x61/0xcb [ 21.987256][ T297] [ 21.990001][ T297] The buggy address belongs to the object at ffff88810b0d9000 [ 21.990001][ T297] which belongs to the cache kmalloc-512 of size 512 [ 22.004207][ T297] The buggy address is located 336 bytes inside of [ 22.004207][ T297] 512-byte region [ffff88810b0d9000, ffff88810b0d9200) [ 22.017887][ T297] The buggy address belongs to the page: [ 22.023529][ T297] page:ffffea00042c3600 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10b0d8 [ 22.033764][ T297] head:ffffea00042c3600 order:2 compound_mapcount:0 compound_pincount:0 [ 22.042081][ T297] flags: 0x4000000000010200(slab|head) [ 22.047523][ T297] raw: 4000000000010200 dead000000000100 dead000000000122 ffff888100043080 [ 22.056100][ T297] raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000 [ 22.064664][ T297] page dumped because: kasan: bad access detected [ 22.071061][ T297] page_owner tracks the page as allocated [ 22.076768][ 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 297, ts 21545089539, free_ts 21499441559 [ 22.095750][ T297] prep_new_page+0x176/0x190 [ 22.100317][ T297] get_page_from_freelist+0x225f/0x23f0 [ 22.105834][ T297] __alloc_pages_nodemask+0x29a/0x640 [ 22.111184][ T297] new_slab+0x84/0x3f0 [ 22.115229][ T297] ___slab_alloc+0x2f8/0x4c0 [ 22.119812][ T297] __slab_alloc+0x63/0xa0 [ 22.124116][ T297] kmem_cache_alloc_trace+0x1a8/0x2e0 [ 22.129461][ T297] l2tp_tunnel_create+0x97/0x460 [ 22.134374][ T297] pppol2tp_connect+0x7ef/0x1640 [ 22.139302][ T297] __sys_connect+0x3ce/0x450 [ 22.143895][ T297] __x64_sys_connect+0x7a/0x90 [ 22.148658][ T297] do_syscall_64+0x31/0x40 [ 22.153058][ T297] entry_SYSCALL_64_after_hwframe+0x61/0xcb [ 22.158926][ T297] page last free stack trace: [ 22.163604][ T297] __free_pages_ok+0x80b/0x830 [ 22.168359][ T297] __free_pages+0xd8/0x390 [ 22.172756][ T297] __free_slab+0xcf/0x190 [ 22.177068][ T297] unfreeze_partials+0x150/0x180 [ 22.181982][ T297] put_cpu_partial+0xc1/0x180 [ 22.186632][ T297] __slab_free+0x2c9/0x3a0 [ 22.191023][ T297] ___cache_free+0x10e/0x130 [ 22.195587][ T297] qlink_free+0x50/0x90 [ 22.199714][ T297] qlist_free_all+0x5f/0xb0 [ 22.204190][ T297] kasan_quarantine_reduce+0x14a/0x160 [ 22.209621][ T297] __kasan_slab_alloc+0x2f/0xe0 [ 22.214446][ T297] slab_post_alloc_hook+0x5d/0x2f0 [ 22.219534][ T297] __kmalloc+0x17b/0x330 [ 22.223764][ T297] __se_sys_setgroups+0xf0/0x4d0 [ 22.228675][ T297] __x64_sys_setgroups+0x5b/0x70 [ 22.233590][ T297] do_syscall_64+0x31/0x40 [ 22.238009][ T297] [ 22.240311][ T297] Memory state around the buggy address: [ 22.245917][ T297] ffff88810b0d9000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 22.253966][ T297] ffff88810b0d9080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb +++ exited with 0 +++ [ 22.262097][ T297] >ffff88810b0d9100: fb fb fb fb fb fb fb fb fb fb f