ci2-android-5-15/strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ci2-android-5-15/syz-executor2004257000 <...> [ 14.909034][ T30] audit: type=1400 audit(1787781573.747:62): avc: denied { rlimitinh } for pid=223 comm="sh" scontext=system_u:system_r:sshd_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1 [ 14.928362][ T30] audit: type=1400 audit(1787781573.747:63): avc: denied { siginh } for pid=223 comm="sh" scontext=system_u:system_r:sshd_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1 Warning: Permanently added '10.128.1.64' (ED25519) to the list of known hosts. execve("ci2-android-5-15/syz-executor2004257000", ["ci2-android-5-15/syz-executor2004257000"], 0x7fff009edc10 /* 10 vars */) = 0 brk(NULL) = 0x555573287000 brk(0x555573287d40) = 0x555573287d40 arch_prctl(ARCH_SET_FS, 0x5555732873c0) = 0 set_tid_address(0x555573287690) = 303 set_robust_list(0x5555732876a0, 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-5-15/syz-executor2004257000", 4096) = 45 getrandom("\xe7\xef\xec\x80\x87\xac\x28\x5a", 8, GRND_NONBLOCK) = 8 brk(NULL) = 0x555573287d40 brk(0x5555732a8d40) = 0x5555732a8d40 brk(0x5555732a9000) = 0x5555732a9000 mprotect(0x7f490807b000, 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=0x555573287690) = 304 ci2-android-5-15/strace-static-x86_64: Process 304 attached [pid 303] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0 [pid 303] openat(AT_FDCWD, "/sys/kernel/debug/x86/nmi_longest_ns", O_WRONLY|O_CLOEXEC [pid 304] set_robust_list(0x5555732876a0, 24 [pid 303] <... openat resumed>) = 3 [pid 304] <... set_robust_list resumed>) = 0 [pid 303] write(3, "10000000000", 11) = 11 [pid 303] close(3) = 0 [pid 303] openat(AT_FDCWD, "/proc/sys/kernel/hung_task_check_interval_secs", O_WRONLY|O_CLOEXEC) = 3 [pid 304] rt_sigprocmask(SIG_SETMASK, [] [pid 303] write(3, "20", 2) = 2 [pid 304] <... rt_sigprocmask resumed>, NULL, 8) = 0 [pid 303] close(3) = 0 [pid 303] openat(AT_FDCWD, "/proc/sys/net/core/bpf_jit_kallsyms", O_WRONLY|O_CLOEXEC) = 3 [pid 303] write(3, "1", 1) = 1 [pid 303] close(3) = 0 [pid 303] openat(AT_FDCWD, "/proc/sys/net/core/bpf_jit_harden", O_WRONLY|O_CLOEXEC) = 3 [pid 303] write(3, "0", 1) = 1 [pid 303] close(3) = 0 [pid 303] openat(AT_FDCWD, "/proc/sys/kernel/kptr_restrict", O_WRONLY|O_CLOEXEC) = 3 [pid 303] write(3, "0", 1) = 1 [pid 303] close(3) = 0 [pid 303] openat(AT_FDCWD, "/proc/sys/kernel/softlockup_all_cpu_backtrace", O_WRONLY|O_CLOEXEC) = 3 [pid 303] write(3, "1", 1) = 1 [pid 303] close(3) = 0 [pid 303] openat(AT_FDCWD, "/proc/sys/fs/mount-max", O_WRONLY|O_CLOEXEC) = 3 [pid 303] write(3, "100", 3) = 3 [pid 303] close(3) = 0 [pid 303] openat(AT_FDCWD, "/proc/sys/vm/oom_dump_tasks", O_WRONLY|O_CLOEXEC) = 3 [pid 303] write(3, "0", 1) = 1 [pid 303] close(3) = 0 [pid 303] openat(AT_FDCWD, "/proc/sys/debug/exception-trace", O_WRONLY|O_CLOEXEC) = 3 [pid 303] write(3, "0", 1) = 1 [pid 303] close(3) = 0 [pid 303] openat(AT_FDCWD, "/proc/sys/kernel/printk", O_WRONLY|O_CLOEXEC) = 3 [pid 303] write(3, "7 4 1 3", 7) = 7 [pid 303] close(3) = 0 [pid 303] openat(AT_FDCWD, "/proc/sys/kernel/keys/gc_delay", O_WRONLY|O_CLOEXEC) = 3 [pid 303] write(3, "1", 1) = 1 [pid 303] close(3) = 0 [pid 303] openat(AT_FDCWD, "/proc/sys/vm/oom_kill_allocating_task", O_WRONLY|O_CLOEXEC) = 3 [pid 303] write(3, "1", 1) = 1 [pid 303] close(3) = 0 [pid 303] openat(AT_FDCWD, "/sys/kernel/debug/failslab/task-filter", O_WRONLY|O_CLOEXEC) = 3 [pid 303] write(3, "Y", 1) = 1 [pid 303] close(3) = 0 [pid 303] openat(AT_FDCWD, "/sys/kernel/debug/fail_page_alloc/task-filter", O_WRONLY|O_CLOEXEC) = 3 [pid 303] write(3, "Y", 1) = 1 [pid 303] close(3) = 0 [pid 303] openat(AT_FDCWD, "/sys/kernel/debug/fail_futex/task-filter", O_WRONLY|O_CLOEXEC) = 3 [pid 303] write(3, "Y", 1) = 1 [pid 303] close(3) = 0 [pid 303] openat(AT_FDCWD, "/sys/kernel/debug/fail_usercopy/task-filter", O_WRONLY|O_CLOEXEC) = 3 [pid 303] write(3, "Y", 1) = 1 [pid 303] close(3) = 0 [pid 303] openat(AT_FDCWD, "/sys/kernel/debug/fail_make_request/task-filter", O_WRONLY|O_CLOEXEC) = 3 [pid 303] write(3, "Y", 1) = 1 [pid 303] close(3) = 0 [pid 303] openat(AT_FDCWD, "/sys/kernel/debug/fail_io_timeout/task-filter", O_WRONLY|O_CLOEXEC) = 3 [pid 303] write(3, "Y", 1) = 1 [pid 303] close(3) = 0 [pid 303] openat(AT_FDCWD, "/sys/kernel/debug/fail_iommufd/task-filter", O_WRONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory) [pid 303] openat(AT_FDCWD, "/proc/sys/kernel/ctrl-alt-del", O_WRONLY|O_CLOEXEC) = 3 [pid 303] write(3, "0", 1) = 1 [pid 303] close(3) = 0 [pid 303] openat(AT_FDCWD, "/proc/sys/kernel/cad_pid", O_WRONLY|O_CLOEXEC) = 3 [pid 303] write(3, "304", 3) = 3 [pid 303] close(3) = 0 [pid 303] kill(304, SIGKILL) = 0 [pid 304] +++ killed by SIGKILL +++ --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_KILLED, si_pid=304, si_uid=0, si_status=SIGKILL, si_utime=0, si_stime=0} --- write(1, "executing program\n", 18) = 18 executing program [ 24.633138][ T30] audit: type=1400 audit(1787781583.497:64): avc: denied { execmem } for pid=303 comm="syz-executor200" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1 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, SIOCGIFINDEX, NULL) = -1 EFAULT (Bad address) exit_group(0) = ? [ 24.678721][ T30] audit: type=1400 audit(1787781583.537:65): avc: denied { create } for pid=303 comm="syz-executor200" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=pppox_socket permissive=1 [ 24.699717][ T30] audit: type=1400 audit(1787781583.547:66): avc: denied { connect } for pid=303 comm="syz-executor200" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=pppox_socket permissive=1 [ 24.720447][ T30] audit: type=1400 audit(1787781583.577:67): avc: denied { ioctl } for pid=303 comm="syz-executor200" path="socket:[885]" dev="sockfs" ino=885 ioctlcmd=0x8933 scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=pppox_socket permissive=1 [ 24.745708][ T303] ================================================================== [ 24.753864][ T303] BUG: KASAN: use-after-free in mutex_lock+0x8e/0x1c0 [ 24.760639][ T303] Write of size 8 at addr ffff88811b899550 by task syz-executor200/303 [ 24.768958][ T303] [ 24.771284][ T303] CPU: 0 PID: 303 Comm: syz-executor200 Not tainted syzkaller #0 [ 24.779010][ T303] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 [ 24.789856][ T303] Call Trace: [ 24.793506][ T303] [ 24.796428][ T303] __dump_stack+0x21/0x30 [ 24.800752][ T303] dump_stack_lvl+0x110/0x170 [ 24.805774][ T303] ? show_regs_print_info+0x20/0x20 [ 24.810988][ T303] ? load_image+0x3f0/0x3f0 [ 24.815583][ T303] print_address_description+0x7f/0x2c0 [ 24.821119][ T303] ? mutex_lock+0x8e/0x1c0 [ 24.825974][ T303] kasan_report+0x10f/0x150 [ 24.830589][ T303] ? mutex_lock+0x8e/0x1c0 [ 24.835012][ T303] kasan_check_range+0x249/0x2a0 [ 24.839943][ T303] __kasan_check_write+0x14/0x20 [ 24.844871][ T303] mutex_lock+0x8e/0x1c0 [ 24.849105][ T303] ? wait_for_completion_killable_timeout+0x10/0x10 [ 24.855682][ T303] ? l2tp_session_put+0xaf/0x1a0 [ 24.860616][ T303] ? l2tp_session_delete+0x3a9/0x4a0 [ 24.865898][ T303] pppol2tp_release+0x178/0x2b0 [ 24.870842][ T303] sock_close+0xb8/0x200 [ 24.875075][ T303] ? sock_mmap+0xa0/0xa0 [ 24.879392][ T303] __fput+0x22b/0x900 [ 24.883363][ T303] ____fput+0x15/0x20 [ 24.887350][ T303] task_work_run+0x127/0x190 [ 24.892036][ T303] do_exit+0xb70/0x29a0 [ 24.896186][ T303] ? ptrace_stop+0x6d8/0xa70 [ 24.900772][ T303] ? put_task_struct+0x90/0x90 [ 24.905535][ T303] ? ptrace_notify+0x1ea/0x270 [ 24.910288][ T303] ? do_notify_parent+0x830/0x830 [ 24.915315][ T303] do_group_exit+0x149/0x310 [ 24.919895][ T303] __x64_sys_exit_group+0x3f/0x40 [ 24.924919][ T303] x64_sys_call+0x832/0x9a0 [ 24.929412][ T303] do_syscall_64+0x4c/0xa0 [ 24.933815][ T303] ? clear_bhb_loop+0x50/0xa0 [ 24.938567][ T303] ? clear_bhb_loop+0x50/0xa0 [ 24.943247][ T303] entry_SYSCALL_64_after_hwframe+0x66/0xd0 [ 24.949256][ T303] RIP: 0033:0x7f4907fe6a05 [ 24.953694][ T303] Code: Unable to access opcode bytes at RIP 0x7f4907fe69db. [ 24.961169][ T303] RSP: 002b:00007ffd5cd705b8 EFLAGS: 00000206 ORIG_RAX: 00000000000000e7 [ 24.969589][ T303] RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 00007f4907fe6a05 [ 24.977573][ T303] RDX: 00000000000000e7 RSI: ffffffffffffffd8 RDI: 0000000000000000 [ 24.985548][ T303] RBP: 0000000000000000 R08: 0000000000000000 R09: 00007ffd5cd70748 [ 24.993512][ T303] R10: 00007ffd5cd70748 R11: 0000000000000206 R12: 0000000000000000 [ 25.001577][ T303] R13: 00007f4908080110 R14: 00007f49080823a8 R15: 00007f49080823c0 [ 25.009642][ T303] [ 25.012662][ T303] [ 25.014978][ T303] Allocated by task 303: [ 25.019222][ T303] __kasan_kmalloc+0xd4/0x100 [ 25.024096][ T303] __kmalloc+0x13d/0x2c0 [ 25.028491][ T303] l2tp_session_create+0x39/0xb60 [ 25.033608][ T303] pppol2tp_connect+0xbf5/0x1640 [ 25.038549][ T303] __sys_connect+0x3cb/0x450 [ 25.043253][ T303] __x64_sys_connect+0x7a/0x90 [ 25.048275][ T303] x64_sys_call+0x7c/0x9a0 [ 25.052690][ T303] do_syscall_64+0x4c/0xa0 [ 25.057107][ T303] entry_SYSCALL_64_after_hwframe+0x66/0xd0 [ 25.062995][ T303] [ 25.065311][ T303] Freed by task 303: [ 25.069231][ T303] kasan_set_track+0x4a/0x70 [ 25.073815][ T303] kasan_set_free_info+0x23/0x40 [ 25.078750][ T303] ____kasan_slab_free+0x125/0x160 [ 25.083861][ T303] __kasan_slab_free+0x11/0x20 [ 25.088620][ T303] slab_free_freelist_hook+0xc2/0x190 [ 25.094212][ T303] kfree+0xc4/0x270 [ 25.098149][ T303] l2tp_session_put+0xaf/0x1a0 [ 25.103280][ T303] l2tp_session_delete+0x3a9/0x4a0 [ 25.108397][ T303] pppol2tp_release+0x169/0x2b0 [ 25.113249][ T303] sock_close+0xb8/0x200 [ 25.117486][ T303] __fput+0x22b/0x900 [ 25.121468][ T303] ____fput+0x15/0x20 [ 25.125451][ T303] task_work_run+0x127/0x190 [ 25.130056][ T303] do_exit+0xb70/0x29a0 [ 25.134216][ T303] do_group_exit+0x149/0x310 [ 25.139374][ T303] __x64_sys_exit_group+0x3f/0x40 [ 25.144600][ T303] x64_sys_call+0x832/0x9a0 [ 25.149104][ T303] do_syscall_64+0x4c/0xa0 [ 25.153514][ T303] entry_SYSCALL_64_after_hwframe+0x66/0xd0 [ 25.159692][ T303] [ 25.162062][ T303] The buggy address belongs to the object at ffff88811b899400 [ 25.162062][ T303] which belongs to the cache kmalloc-512 of size 512 [ 25.176391][ T303] The buggy address is located 336 bytes inside of [ 25.176391][ T303] 512-byte region [ffff88811b899400, ffff88811b899600) [ 25.189845][ T303] The buggy address belongs to the page: [ 25.195559][ T303] page:ffffea00046e2600 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11b898 [ 25.205895][ T303] head:ffffea00046e2600 order:2 compound_mapcount:0 compound_pincount:0 [ 25.214421][ T303] flags: 0x4000000000010200(slab|head|zone=1) [ 25.220489][ T303] raw: 4000000000010200 0000000000000000 dead000000000122 ffff888100042f00 [ 25.229433][ T303] raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000 [ 25.238019][ T303] page dumped because: kasan: bad access detected [ 25.244512][ T303] page_owner tracks the page as allocated [ 25.250226][ T303] page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 299, ts 24562618161, free_ts 15283652324 [ 25.269244][ T303] post_alloc_hook+0x192/0x1b0 [ 25.274140][ T303] prep_new_page+0x1c/0x110 [ 25.278679][ T303] get_page_from_freelist+0x2c3a/0x2cd0 [ 25.284268][ T303] __alloc_pages+0x1a2/0x460 [ 25.288859][ T303] new_slab+0xa0/0x4d0 [ 25.293012][ T303] ___slab_alloc+0x3ac/0x840 [ 25.297608][ T303] __slab_alloc+0x49/0x90 [ 25.302053][ T303] __kmalloc_track_caller+0x169/0x2c0 [ 25.307426][ T303] __alloc_skb+0x210/0x730 [ 25.311925][ T303] alloc_skb_with_frags+0xa8/0x620 [ 25.317118][ T303] sock_alloc_send_pskb+0x87f/0x9a0 [ 25.322318][ T303] unix_stream_sendmsg+0x428/0xc90 [ 25.327598][ T303] sock_write_iter+0x2a6/0x3a0 [ 25.332356][ T303] vfs_write+0x831/0xfd0 [ 25.336591][ T303] ksys_write+0x14a/0x260 [ 25.340924][ T303] __x64_sys_write+0x7b/0x90 [ 25.345599][ T303] page last free stack trace: [ 25.350265][ T303] free_unref_page_prepare+0x5fa/0x600 [ 25.355742][ T303] free_unref_page+0xae/0x540 [ 25.360413][ T303] free_compound_page+0x78/0xa0 [ 25.365370][ T303] __put_compound_page+0x77/0xb0 [ 25.370305][ T303] __put_page+0xbc/0xe0 [ 25.375067][ T303] skb_release_data+0x37c/0xa20 [ 25.380002][ T303] __kfree_skb+0x50/0x70 [ 25.384247][ T303] tcp_recvmsg_locked+0x13d1/0x24f0 [ 25.389443][ T303] tcp_recvmsg+0x233/0x770 [ 25.393853][ T303] inet_recvmsg+0x13a/0x470 [ 25.398615][ T303] sock_read_iter+0x2c2/0x380 [ 25.403286][ T303] vfs_read+0x6c0/0xc20 [ 25.407460][ T303] ksys_read+0x14a/0x260 [ 25.411790][ T303] __x64_sys_read+0x7b/0x90 [ 25.416298][ T303] x64_sys_call+0x96d/0x9a0 [ 25.420888][ T303] do_syscall_64+0x4c/0xa0 [ 25.425349][ T303] [ 25.427673][ T303] Memory state around the buggy address: [ 25.433297][ T303] ffff88811b899400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 25.441353][ T303] ffff88811b899480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 25.449407][ T303] >ffff88811b899500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 25.458186][ T303] ^ [ 25.464855][ T303] ffff88811b899580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 25.473274][ T303] ffff88811b899600: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc +++ exited with 0 +++ [ 25.48141