ci2-android-5-10/strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ci2-android-5-10/syz-executor1526144815 <...> Warning: Permanently added '10.128.0.6' (ED25519) to the list of known hosts. execve("ci2-android-5-10/syz-executor1526144815", ["ci2-android-5-10/syz-executor1526144815"], 0x7ffed56eb200 /* 10 vars */) = 0 brk(NULL) = 0x55558e31e000 brk(0x55558e31ed40) = 0x55558e31ed40 arch_prctl(ARCH_SET_FS, 0x55558e31e3c0) = 0 set_tid_address(0x55558e31e690) = 297 set_robust_list(0x55558e31e6a0, 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-executor1526144815", 4096) = 45 getrandom("\x4c\x5b\x93\xcb\x6c\xe9\x5a\x36", 8, GRND_NONBLOCK) = 8 brk(NULL) = 0x55558e31ed40 brk(0x55558e33fd40) = 0x55558e33fd40 brk(0x55558e340000) = 0x55558e340000 mprotect(0x7f66284ea000, 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 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\x00\x00\x00\x00\x04\x00\x00\x00\x04\x00\x00\x00\xfc\xff\x00\x00\x0a\x00\x4e\x22\x00\x00\xff\xff\xff\x02\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01\x00\x00\x00\x00"}, 50) = 0 ioctl(3, BTRFS_IOC_START_SYNC, NULL) = -1 ENOTTY (Inappropriate ioctl for device) exit_group(0) = ? [ 23.833569][ T24] audit: type=1400 audit(1786896859.920:64): avc: denied { execmem } for pid=297 comm="syz-executor152" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1 [ 23.853215][ T24] audit: type=1400 audit(1786896859.930:65): avc: denied { create } for pid=297 comm="syz-executor152" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=pppox_socket permissive=1 [ 23.873291][ T24] audit: type=1400 audit(1786896859.930:66): avc: denied { connect } for pid=297 comm="syz-executor152" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=pppox_socket permissive=1 [ 23.873312][ T297] ================================================================== [ 23.893264][ T24] audit: type=1400 audit(1786896859.940:67): avc: denied { ioctl } for pid=297 comm="syz-executor152" path="socket:[14535]" dev="sockfs" ino=14535 ioctlcmd=0x9418 scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=pppox_socket permissive=1 [ 23.901274][ T297] BUG: KASAN: use-after-free in pppol2tp_sock_to_session+0x1a0/0x1b0 [ 23.934153][ T297] Read of size 4 at addr ffff88810ac2c400 by task syz-executor152/297 [ 23.942271][ T297] [ 23.944582][ T297] CPU: 0 PID: 297 Comm: syz-executor152 Not tainted syzkaller #0 [ 23.952263][ T297] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 [ 23.962293][ T297] Call Trace: [ 23.965561][ T297] __dump_stack+0x21/0x24 [ 23.969858][ T297] dump_stack_lvl+0x1a7/0x208 [ 23.974518][ T297] ? show_regs_print_info+0x18/0x18 [ 23.979681][ T297] ? thaw_kernel_threads+0x220/0x220 [ 23.984937][ T297] ? __local_bh_enable_ip+0x53/0x80 [ 23.990103][ T297] print_address_description+0x7f/0x2c0 [ 23.995618][ T297] ? pppol2tp_sock_to_session+0x1a0/0x1b0 [ 24.001305][ T297] kasan_report+0x100/0x140 [ 24.005785][ T297] ? pppol2tp_sock_to_session+0x1a0/0x1b0 [ 24.011485][ T297] __asan_report_load4_noabort+0x14/0x20 [ 24.017085][ T297] pppol2tp_sock_to_session+0x1a0/0x1b0 [ 24.022598][ T297] pppol2tp_release+0x150/0x2b0 [ 24.027418][ T297] sock_close+0xb8/0x200 [ 24.031632][ T297] ? sock_mmap+0xa0/0xa0 [ 24.035847][ T297] __fput+0x2dc/0x730 [ 24.039797][ T297] ? _raw_spin_lock+0x94/0xf0 [ 24.044445][ T297] ____fput+0x15/0x20 [ 24.048395][ T297] task_work_run+0x127/0x190 [ 24.052952][ T297] do_exit+0xa7c/0x24e0 [ 24.057084][ T297] ? ptrace_notify+0x1ea/0x270 [ 24.061823][ T297] ? put_task_struct+0x90/0x90 [ 24.066554][ T297] ? do_notify_parent+0x810/0x810 [ 24.071546][ T297] do_group_exit+0x149/0x310 [ 24.076105][ T297] __x64_sys_exit_group+0x3f/0x40 [ 24.081095][ T297] do_syscall_64+0x31/0x40 [ 24.085484][ T297] entry_SYSCALL_64_after_hwframe+0x61/0xcb [ 24.091358][ T297] RIP: 0033:0x7f6628459345 [ 24.095754][ T297] Code: Unable to access opcode bytes at RIP 0x7f662845931b. [ 24.103088][ T297] RSP: 002b:00007fff524b5e08 EFLAGS: 00000202 ORIG_RAX: 00000000000000e7 [ 24.111471][ T297] RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 00007f6628459345 [ 24.119411][ T297] RDX: 00000000000000e7 RSI: ffffffffffffffd8 RDI: 0000000000000000 [ 24.127365][ T297] RBP: 0000000000000000 R08: 0000000000000000 R09: 00007fff524b5f98 [ 24.135310][ T297] R10: 000000000000000a R11: 0000000000000202 R12: 0000000000000000 [ 24.143265][ T297] R13: 00007f66284ef110 R14: 00007f66284f13a8 R15: 00007f66284f13c0 [ 24.151216][ T297] [ 24.153516][ T297] Allocated by task 297: [ 24.157727][ T297] __kasan_kmalloc+0xd4/0x100 [ 24.162375][ T297] __kmalloc+0x19f/0x330 [ 24.166590][ T297] l2tp_session_create+0x39/0xb60 [ 24.171581][ T297] pppol2tp_connect+0xbf5/0x1640 [ 24.176505][ T297] __sys_connect+0x3ce/0x450 [ 24.181188][ T297] __x64_sys_connect+0x7a/0x90 [ 24.185972][ T297] do_syscall_64+0x31/0x40 [ 24.190371][ T297] entry_SYSCALL_64_after_hwframe+0x61/0xcb [ 24.196247][ T297] [ 24.198547][ T297] Freed by task 49: [ 24.202331][ T297] kasan_set_track+0x4a/0x70 [ 24.206913][ T297] kasan_set_free_info+0x23/0x40 [ 24.211830][ T297] ____kasan_slab_free+0x125/0x160 [ 24.216907][ T297] __kasan_slab_free+0x11/0x20 [ 24.221638][ T297] slab_free_freelist_hook+0xc5/0x190 [ 24.226979][ T297] kfree+0xc0/0x270 [ 24.230754][ T297] l2tp_session_put+0xb2/0x1a0 [ 24.235487][ T297] l2tp_session_delete+0x3a9/0x4a0 [ 24.240564][ T297] l2tp_tunnel_del_work+0x180/0x3d0 [ 24.245732][ T297] process_one_work+0x6fd/0xbc0 [ 24.250550][ T297] worker_thread+0xa8e/0x13c0 [ 24.255196][ T297] kthread+0x324/0x3b0 [ 24.259243][ T297] ret_from_fork+0x1f/0x30 [ 24.263623][ T297] [ 24.265936][ T297] The buggy address belongs to the object at ffff88810ac2c400 [ 24.265936][ T297] which belongs to the cache kmalloc-512 of size 512 [ 24.279961][ T297] The buggy address is located 0 bytes inside of [ 24.279961][ T297] 512-byte region [ffff88810ac2c400, ffff88810ac2c600) [ 24.293025][ T297] The buggy address belongs to the page: [ 24.298658][ T297] page:ffffea00042b0b00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10ac2c [ 24.308863][ T297] head:ffffea00042b0b00 order:2 compound_mapcount:0 compound_pincount:0 [ 24.317163][ T297] flags: 0x4000000000010200(slab|head) [ 24.322594][ T297] raw: 4000000000010200 dead000000000100 dead000000000122 ffff888100043080 [ 24.331147][ T297] raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000 [ 24.339696][ T297] page dumped because: kasan: bad access detected [ 24.346084][ T297] page_owner tracks the page as allocated [ 24.351775][ 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 23763400525, free_ts 18348476378 [ 24.370755][ T297] prep_new_page+0x176/0x190 [ 24.375312][ T297] get_page_from_freelist+0x225f/0x23f0 [ 24.380841][ T297] __alloc_pages_nodemask+0x29a/0x640 [ 24.386181][ T297] new_slab+0x84/0x3f0 [ 24.390219][ T297] ___slab_alloc+0x2f8/0x4c0 [ 24.394776][ T297] __slab_alloc+0x63/0xa0 [ 24.399071][ T297] __kmalloc_track_caller+0x1e4/0x310 [ 24.404413][ T297] __alloc_skb+0xdc/0x520 [ 24.408713][ T297] alloc_skb_with_frags+0xa3/0x560 [ 24.413794][ T297] sock_alloc_send_pskb+0x87f/0x9a0 [ 24.418964][ T297] unix_stream_sendmsg+0x4c9/0xbe0 [ 24.424044][ T297] sock_write_iter+0x2a6/0x3a0 [ 24.428773][ T297] vfs_write+0x770/0xd70 [ 24.432988][ T297] ksys_write+0x14a/0x260 [ 24.437284][ T297] __x64_sys_write+0x7b/0x90 [ 24.441844][ T297] do_syscall_64+0x31/0x40 [ 24.446225][ T297] page last free stack trace: [ 24.450870][ T297] free_unref_page_prepare+0x2b7/0x2d0 [ 24.456298][ T297] free_unref_page+0x7f/0x190 [ 24.460944][ T297] __put_page+0xae/0xe0 [ 24.465103][ T297] anon_pipe_buf_release+0x165/0x1f0 [ 24.470358][ T297] pipe_read+0x563/0x1050 [ 24.474677][ T297] vfs_read+0x62a/0xa50 [ 24.478799][ T297] ksys_read+0x14a/0x260 [ 24.483012][ T297] __x64_sys_read+0x7b/0x90 [ 24.487483][ T297] do_syscall_64+0x31/0x40 [ 24.491869][ T297] entry_SYSCALL_64_after_hwframe+0x61/0xcb [ 24.497723][ T297] [ 24.500021][ T297] Memory state around the buggy address: [ 24.505627][ T297] ffff88810ac2c300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 24.513663][ T297] ffff88810ac2c380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 24.521700][ T297] >ffff88810ac2c400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 24.529761][ T297] ^ [ 24.533797][ T297] ffff88810ac2c480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 24.541825][ T297] ffff88810ac2c500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 24.549852][ T297] ================================================================== [ 24.557883][ T297] Disabling lock debugging due to kernel taint [ 24.564332][ T297] ------------[ cut here ]------------ [ 24.568668][ T24] audit: type=1400 audit(1786896860.650:68): avc: denied { read } for pid=77 comm="syslogd" name="log" dev="sda1" ino=2010 scontext=system_u:system_r:syslogd_t tcontext=system_u:object_r:var_t tclass=lnk_file permissive=1 [ 24.569806][ T297] WARNING: CPU: 0 PID: 297 at net/l2tp/l2tp_ppp.c:156 pppol2tp_sock_to_session+0x167/0x1b0 [ 24.591673][ T24] audit: type=1400 audit(1786896860.650:69): avc: denied { search } for pid=77 comm="syslogd" name="/" dev="tmpfs" ino=1 scontext=system_u:system_r:syslogd_t tcontext=system_u:object_r:tmpfs_t tclass=dir permissive=1 [ 24.601388][ T297] Modules linked in: [ 24.622580][ T24] audit: type=1400 audit(1786896860.650:70): avc: denied { write } for pid=77 comm="syslogd" name="/" dev="tmpfs" ino=1 scontext=system_u:system_r:syslogd_t tcontext=system_u:object_r:tmpfs_t tclass=dir permissive=1 [ 24.622674][ T297] [ 24.626523][ T24] audit: type=1400 audit(1786896860.650:71): avc: denied { add_name } for pid=77 comm="syslogd" name="messages" scontext=system_u:system_r:syslogd_t tcontext=system_u:object_r:tmpfs_t tclass=dir permissive=1 [ 24.647626][ T297] CPU: 0 PID: 297 Comm: syz-executor152 Tainted: G B syzkaller #0 [ 24.649920][ T24] audit: type=1400 audit(1786896860.650:72): avc: denied { create } for pid=77 comm="syslogd" name="messages" scontext=system_u:system_r:syslogd_t tcontext=system_u:object_r:tmpfs_t tclass=file permissive=1 [ 24.670390][ T297] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 [ 24.679456][ T24] audit: type=1400 audit(1786896860.650:73): avc: denied { append open } for pid=77 comm="syslogd" path="/tmp/messages" dev="tmpfs" ino=5 scontext=system_u:system_r:syslogd_t tcontext=system_u:object_r:tmpfs_t tclass=file permissive=1 [ 24.699815][ T297] RIP: 0010:pppol2tp_sock_to_session+0x167/0x1b0 [ 24.738881][ T297] Code: 5d c3 e8 9c bc 35 fd be 02 00 00 00 eb 0a e8 90 bc 35 fd be 01 00 00 00 4c 89 f7 e8 13 13 0f fe e9 0f ff ff ff e8 79 bc 35 fd <0f> 0b 48 89 df e8 ef 00 00 00 eb bd e8 68 bc 35 fd 4c 89 f7 be 03 [ 24.758488][ T297] RSP: 0018:ffffc90000b17c00 EFLAGS: 00010293 [ 24.764559][ T297] RAX: ffffffff842ef547 RBX: ffff888109521000 RCX: ffff888121c42780 [ 24.772523][ T297] RDX: 0000000000000000 RSI: 000000001e9de600 RDI: 000000000c04eb7d [ 24.780477][ T297] RBP: ffffc90000b17c20 R08: 0000000000000003 R09: 0000000000000004 [ 24.788459][ T297] R10: dffffc0000000000 R11: fffffbfff0dcf848 R12: dffffc0000000000 [ 24.796447][ T297] R13: dffffc0000000000 R14: 000000001e9de600 R15: ffff88810ac2c400 [ 24.804432][ T297] FS: 0000000000000000(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 [ 24.813385][ T297] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 24.819942][ T297] CR2: 00007f66284f6230 CR3: 000000010d600000 CR4: 00000000003506b0 [ 24.827910][ T297] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 24.835879][ T297] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 24.843845][ T297] Call Trace: [ 24.847120][ T297] pppol2tp_release+0x150/0x2b0 [ 24.851972][ T297] sock_close+0xb8/0x200 [ 24.856196][ T297] ? sock_mmap+0xa0/0xa0 [ 24.860407][ T297] __fput+0x2dc/0x730 [ 24.864392][ T297] ? _raw_spin_lock+0x94/0xf0 [ 24.869050][ T297] ____fput+0x15/0x20 [ 24.873034][ T297] task_work_run+0x127/0x190 [ 24.877611][ T297] do_exit+0xa7c/0x24e0 [ 24.881765][ T297] ? ptrace_notify+0x1ea/0x270 [ 24.886509][ T297] ? put_task_struct+0x90/0x90 [ 24.891252][ T297] ? do_notify_parent+0x810/0x810 [ 24.896280][ T297] do_group_exit+0x149/0x310 [ 24.900852][ T297] __x64_sys_exit_group+0x3f/0x40 [ 24.905876][ T297] do_syscall_64+0x31/0x40 [ 24.910271][ T297] entry_SYSCALL_64_after_hwframe+0x61/0xcb [ 24.916164][ T297] RIP: 0033:0x7f6628459345 [ 24.920558][ T297] Code: Unable to access opcode bytes at RIP 0x7f662845931b. [ 24.927919][ T297] RSP: 002b:00007fff524b5e08 EFLAGS: 00000202 ORIG_RAX: 00000000000000e7 +++ exited with 0 +++ [ 24.936328][ T297] RAX