ci2-android-6-1/strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ci2-android-6-1/syz-executor3555668205 <...> Warning: Permanently added '10.128.0.207' (ED25519) to the list of known hosts. execve("ci2-android-6-1/syz-executor3555668205", ["ci2-android-6-1/syz-executor3555668205"], 0x7ffd28a16960 /* 10 vars */) = 0 brk(NULL) = 0x5555590f8000 brk(0x5555590f8e00) = 0x5555590f8e00 arch_prctl(ARCH_SET_FS, 0x5555590f8480) = 0 set_tid_address(0x5555590f8750) = 305 set_robust_list(0x5555590f8760, 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-executor3555668205", 4096) = 44 getrandom("\xf0\xbe\xe4\x0b\xdc\x05\x48\x3f", 8, GRND_NONBLOCK) = 8 brk(NULL) = 0x5555590f8e00 brk(0x555559119e00) = 0x555559119e00 brk(0x55555911a000) = 0x55555911a000 mprotect(0x7f3123d3a000, 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_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=0x7f3123c99c90, sa_mask=[], sa_flags=SA_RESTORER|SA_NODEFER|SA_SIGINFO, sa_restorer=0x7f3123c9c840}, NULL, 8) = 0 rt_sigaction(SIGBUS, {sa_handler=0x7f3123c99c90, sa_mask=[], sa_flags=SA_RESTORER|SA_NODEFER|SA_SIGINFO, sa_restorer=0x7f3123c9c840}, NULL, 8) = 0 executing program 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\x4e\x23\xac\x1e\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x00\x00\x00\x00\x00\x00\x04\x00\x00\x00\x00\x00\x00\x00"}, 46) = 0 ioctl(3, PPPIOCSFLAGS, 0) = -1 ENOSYS (Function not implemented) exit_group(0) = ? [ 20.023613][ T28] audit: type=1400 audit(1792931935.278:64): avc: denied { execmem } for pid=305 comm="syz-executor355" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1 [ 20.026686][ T28] audit: type=1400 audit(1792931935.278:65): avc: denied { create } for pid=305 comm="syz-executor355" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=pppox_socket permissive=1 [ 20.029424][ T28] audit: type=1400 audit(1792931935.278:66): avc: denied { connect } for pid=305 comm="syz-executor355" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=pppox_socket permissive=1 [ 20.032281][ T305] ================================================================== [ 20.032710][ T28] audit: type=1400 audit(1792931935.278:67): avc: denied { ioctl } for pid=305 comm="syz-executor355" path="socket:[14700]" dev="sockfs" ino=14700 ioctlcmd=0x7459 scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=pppox_socket permissive=1 [ 20.033419][ T305] BUG: KASAN: use-after-free in mutex_lock+0x86/0x1b0 [ 20.037572][ T305] Write of size 8 at addr ffff88810e5ecd50 by task syz-executor355/305 [ 20.038663][ T305] [ 20.038995][ T305] CPU: 0 PID: 305 Comm: syz-executor355 Not tainted syzkaller #0 [ 20.040057][ T305] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026 [ 20.041399][ T305] Call Trace: [ 20.041859][ T305] [ 20.042266][ T305] __dump_stack+0x21/0x24 [ 20.042862][ T305] dump_stack_lvl+0x110/0x170 [ 20.043496][ T305] ? __cfi_dump_stack_lvl+0x8/0x8 [ 20.044178][ T305] ? mutex_lock+0x86/0x1b0 [ 20.048572][ T305] print_address_description+0x71/0x200 [ 20.054114][ T305] print_report+0x4a/0x60 [ 20.058438][ T305] kasan_report+0x122/0x150 [ 20.062924][ T305] ? mutex_lock+0x86/0x1b0 [ 20.067331][ T305] kasan_check_range+0x249/0x2a0 [ 20.072251][ T305] __kasan_check_write+0x14/0x20 [ 20.077166][ T305] mutex_lock+0x86/0x1b0 [ 20.081384][ T305] ? __cfi_mutex_lock+0x10/0x10 [ 20.086223][ T305] ? kfree+0x6f/0xf0 [ 20.090123][ T305] ? l2tp_session_put+0xaf/0x1a0 [ 20.095068][ T305] ? l2tp_session_delete+0x3df/0x4d0 [ 20.100337][ T305] pppol2tp_release+0x178/0x2b0 [ 20.105169][ T305] sock_close+0xc9/0x220 [ 20.109395][ T305] ? __cfi_sock_close+0x10/0x10 [ 20.114224][ T305] __fput+0x1fd/0x8f0 [ 20.118188][ T305] ____fput+0x15/0x20 [ 20.122147][ T305] task_work_run+0x1e1/0x250 [ 20.126714][ T305] ? __cfi_task_work_run+0x10/0x10 [ 20.131801][ T305] ? __kasan_check_write+0x14/0x20 [ 20.136897][ T305] do_exit+0xb0d/0x29f0 [ 20.141047][ T305] ? ptrace_stop+0x6dc/0x8e0 [ 20.145617][ T305] ? __cfi_do_exit+0x10/0x10 [ 20.150185][ T305] ? __kasan_check_write+0x14/0x20 [ 20.155268][ T305] ? _raw_spin_lock_irq+0x95/0xf0 [ 20.160265][ T305] ? __cfi__raw_spin_lock_irq+0x10/0x10 [ 20.165804][ T305] ? zap_other_threads+0x321/0x3a0 [ 20.170892][ T305] do_group_exit+0x21b/0x2e0 [ 20.175464][ T305] __x64_sys_exit_group+0x3f/0x40 [ 20.180470][ T305] x64_sys_call+0x7b4/0x9a0 [ 20.184972][ T305] do_syscall_64+0x4c/0xa0 [ 20.189535][ T305] ? clear_bhb_loop+0x30/0x80 [ 20.194187][ T305] ? clear_bhb_loop+0x30/0x80 [ 20.198838][ T305] entry_SYSCALL_64_after_hwframe+0x68/0xd2 [ 20.204706][ T305] RIP: 0033:0x7f3123caa685 [ 20.209098][ T305] Code: Unable to access opcode bytes at 0x7f3123caa65b. [ 20.216086][ T305] RSP: 002b:00007ffc8e3b43e8 EFLAGS: 00000206 ORIG_RAX: 00000000000000e7 [ 20.224489][ T305] RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 00007f3123caa685 [ 20.232434][ T305] RDX: 00000000000000e7 RSI: ffffffffffffffd8 RDI: 0000000000000000 [ 20.240397][ T305] RBP: 0000000000000000 R08: 0000000000000000 R09: 00007f3123c99c90 [ 20.248345][ T305] R10: 00007f3123c99c90 R11: 0000000000000206 R12: 0000000000000000 [ 20.256469][ T305] R13: 00007f3123d3f110 R14: 00007f3123d41408 R15: 00007f3123d41420 [ 20.264442][ T305] [ 20.267451][ T305] [ 20.269751][ T305] Allocated by task 305: [ 20.273963][ T305] kasan_set_track+0x4b/0x70 [ 20.278539][ T305] kasan_save_alloc_info+0x1f/0x30 [ 20.283637][ T305] __kasan_kmalloc+0x95/0xb0 [ 20.288236][ T305] __kmalloc+0xb4/0x1e0 [ 20.292373][ T305] l2tp_session_create+0x38/0xbd0 [ 20.297386][ T305] pppol2tp_connect+0xbf5/0x1640 [ 20.302311][ T305] __sys_connect+0x3da/0x460 [ 20.306882][ T305] __x64_sys_connect+0x7a/0x90 [ 20.311632][ T305] x64_sys_call+0x88d/0x9a0 [ 20.316144][ T305] do_syscall_64+0x4c/0xa0 [ 20.320536][ T305] entry_SYSCALL_64_after_hwframe+0x68/0xd2 [ 20.326419][ T305] [ 20.328721][ T305] Freed by task 305: [ 20.332584][ T305] kasan_set_track+0x4b/0x70 [ 20.337167][ T305] kasan_save_free_info+0x2b/0x40 [ 20.342178][ T305] ____kasan_slab_free+0x132/0x180 [ 20.347264][ T305] __kasan_slab_free+0x11/0x20 [ 20.352002][ T305] slab_free_freelist_hook+0xc2/0x190 [ 20.357363][ T305] __kmem_cache_free+0xb7/0x1b0 [ 20.362202][ T305] kfree+0x6f/0xf0 [ 20.365896][ T305] l2tp_session_put+0xaf/0x1a0 [ 20.370637][ T305] l2tp_session_delete+0x3df/0x4d0 [ 20.375736][ T305] pppol2tp_release+0x169/0x2b0 [ 20.380569][ T305] sock_close+0xc9/0x220 [ 20.384792][ T305] __fput+0x1fd/0x8f0 [ 20.388756][ T305] ____fput+0x15/0x20 [ 20.392717][ T305] task_work_run+0x1e1/0x250 [ 20.398700][ T305] do_exit+0xb0d/0x29f0 [ 20.402841][ T305] do_group_exit+0x21b/0x2e0 [ 20.407413][ T305] __x64_sys_exit_group+0x3f/0x40 [ 20.412427][ T305] x64_sys_call+0x7b4/0x9a0 [ 20.416914][ T305] do_syscall_64+0x4c/0xa0 [ 20.421314][ T305] entry_SYSCALL_64_after_hwframe+0x68/0xd2 [ 20.427193][ T305] [ 20.429497][ T305] The buggy address belongs to the object at ffff88810e5ecc00 [ 20.429497][ T305] which belongs to the cache kmalloc-512 of size 512 [ 20.443528][ T305] The buggy address is located 336 bytes inside of [ 20.443528][ T305] 512-byte region [ffff88810e5ecc00, ffff88810e5ece00) [ 20.456785][ T305] [ 20.459088][ T305] The buggy address belongs to the physical page: [ 20.465476][ T305] page:ffffea0004397b00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10e5ec [ 20.475711][ T305] head:ffffea0004397b00 order:2 compound_mapcount:0 compound_pincount:0 [ 20.484014][ T305] flags: 0x4000000000010200(slab|head|zone=1) [ 20.490073][ T305] raw: 4000000000010200 dead000000000100 dead000000000122 ffff888100042f00 [ 20.498637][ T305] raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000 [ 20.507194][ T305] page dumped because: kasan: bad access detected [ 20.513615][ T305] page_owner tracks the page as allocated [ 20.519316][ 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 1, tgid 1 (swapper/0), ts 2658591488, free_ts 0 [ 20.538914][ T305] post_alloc_hook+0x1f5/0x210 [ 20.543674][ T305] prep_new_page+0x1c/0x110 [ 20.548159][ T305] get_page_from_freelist+0x2ca9/0x2d20 [ 20.553689][ T305] __alloc_pages+0x1fa/0x610 [ 20.558265][ T305] alloc_slab_page+0x6e/0xf0 [ 20.562852][ T305] new_slab+0x98/0x3e0 [ 20.566897][ T305] ___slab_alloc+0x70f/0xb70 [ 20.571473][ T305] __slab_alloc+0x5e/0xa0 [ 20.575787][ T305] __kmem_cache_alloc_node+0x204/0x2d0 [ 20.581230][ T305] __kmalloc_node_track_caller+0xa1/0x1e0 [ 20.586930][ T305] __alloc_skb+0x226/0x4a0 [ 20.591329][ T305] inet_netconf_notify_devconf+0x169/0x220 [ 20.597122][ T305] __devinet_sysctl_register+0x2af/0x320 [ 20.602739][ T305] devinet_sysctl_register+0x169/0x1e0 [ 20.608182][ T305] inetdev_init+0x2ca/0x510 [ 20.612667][ T305] inetdev_event+0x1f4/0x10a0 [ 20.617328][ T305] page_owner free stack trace missing [ 20.622673][ T305] [ 20.624972][ T305] Memory state around the buggy address: [ 20.630581][ T305] ffff88810e5ecc00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 20.638622][ T305] ffff88810e5ecc80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 20.646659][ T305] >ffff88810e5ecd00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 20.654693][ T305] ^ [ 20.661343][ T305] ffff88810e5ecd80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb +++ exited with 0 +++ [ 20.669380][ T305] ffff88810e5ece00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc