ci2-android-5-10/strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ci2-android-5-10/syz-executor274746912 <...> Warning: Permanently added '10.128.0.24' (ED25519) to the list of known hosts. execve("ci2-android-5-10/syz-executor274746912", ["ci2-android-5-10/syz-executor274746912"], 0x7ffdc637ca20 /* 10 vars */) = 0 brk(NULL) = 0x555578a8f000 brk(0x555578a8fd40) = 0x555578a8fd40 arch_prctl(ARCH_SET_FS, 0x555578a8f3c0) = 0 set_tid_address(0x555578a8f690) = 309 set_robust_list(0x555578a8f6a0, 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-executor274746912", 4096) = 44 getrandom("\x01\x70\xa8\xfc\x67\xfb\x3b\x53", 8, GRND_NONBLOCK) = 8 brk(NULL) = 0x555578a8fd40 brk(0x555578ab0d40) = 0x555578ab0d40 brk(0x555578ab1000) = 0x555578ab1000 mprotect(0x7fd68d104000, 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 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\x00\x00\x00\x00\x04\x00\x00\x00\x08\x00\x00\x00\x00\x00\x00\x00\x0a\x00\x00\x00\x00\x00\x00\x00\x20\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x00\x00\x00"}, 50) = 0 sendfile(-1, -1, [3], 2757) = -1 EBADF (Bad file descriptor) clone3({flags=CLONE_UNTRACED|CLONE_CHILD_SETTID|CLONE_NEWCGROUP|CLONE_NEWPID, child_tid=NULL, exit_signal=SIGRT_7, stack=NULL, stack_size=0, cgroup=4294967295}, 88) = 310 ioctl(3, PPPIOCSMRU, 0) = -1 ENOSYS (Function not implemented) exit_group(0) = ? +++ exited with 0 +++ [ 28.676574][ T24] audit: type=1400 audit(1790701518.370:64): avc: denied { execmem } for pid=309 comm="syz-executor274" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1 [ 28.696095][ T24] audit: type=1400 audit(1790701518.370:65): avc: denied { create } for pid=309 comm="syz-executor274" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=pppox_socket permissive=1 [ 28.716314][ T24] audit: type=1400 audit(1790701518.370:66): avc: denied { connect } for pid=309 comm="syz-executor274" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=pppox_socket permissive=1 [ 28.736513][ T24] audit: type=1400 audit(1790701518.400:67): avc: denied { ioctl } for pid=309 comm="syz-executor274" path="socket:[1695]" dev="sockfs" ino=1695 ioctlcmd=0x7452 scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=pppox_socket permissive=1 [ 28.867179][ T310] ================================================================== [ 28.875304][ T310] BUG: KASAN: use-after-free in pppol2tp_sock_to_session+0x1a0/0x1b0 [ 28.883373][ T310] Read of size 4 at addr ffff8881002f3400 by task syz-executor274/310 [ 28.891508][ T310] [ 28.893843][ T310] CPU: 0 PID: 310 Comm: syz-executor274 Not tainted syzkaller #0 [ 28.901560][ T310] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026 [ 28.911615][ T310] Call Trace: [ 28.914900][ T310] __dump_stack+0x21/0x24 [ 28.919221][ T310] dump_stack_lvl+0x1a7/0x208 [ 28.923886][ T310] ? show_regs_print_info+0x18/0x18 [ 28.929090][ T310] ? thaw_kernel_threads+0x220/0x220 [ 28.934382][ T310] ? __local_bh_enable_ip+0x53/0x80 [ 28.939579][ T310] print_address_description+0x7f/0x2c0 [ 28.945121][ T310] ? pppol2tp_sock_to_session+0x1a0/0x1b0 [ 28.950852][ T310] kasan_report+0x100/0x140 [ 28.955355][ T310] ? pppol2tp_sock_to_session+0x1a0/0x1b0 [ 28.961104][ T310] __asan_report_load4_noabort+0x14/0x20 [ 28.966730][ T310] pppol2tp_sock_to_session+0x1a0/0x1b0 [ 28.972268][ T310] pppol2tp_release+0x150/0x2b0 [ 28.977110][ T310] sock_close+0xb8/0x200 [ 28.981357][ T310] ? sock_mmap+0xa0/0xa0 [ 28.985606][ T310] __fput+0x2dc/0x730 [ 28.989591][ T310] ____fput+0x15/0x20 [ 28.993567][ T310] task_work_run+0x127/0x190 [ 28.998148][ T310] do_exit+0xa7c/0x24e0 [ 29.002299][ T310] ? __kasan_check_write+0x14/0x20 [ 29.007411][ T310] ? switch_fpu_return+0x19c/0x330 [ 29.012512][ T310] ? put_task_struct+0x90/0x90 [ 29.017266][ T310] ? fpu__clear_all+0x20/0x20 [ 29.021945][ T310] ? __kasan_check_read+0x11/0x20 [ 29.027094][ T310] __x64_sys_exit+0x40/0x40 [ 29.031608][ T310] do_syscall_64+0x31/0x40 [ 29.036041][ T310] entry_SYSCALL_64_after_hwframe+0x61/0xcb [ 29.041946][ T310] RIP: 0033:0x7fd68d073d79 [ 29.046368][ T310] Code: Unable to access opcode bytes at RIP 0x7fd68d073d4f. [ 29.053743][ T310] RSP: 002b:00007ffc4c17bb08 EFLAGS: 00000246 ORIG_RAX: 000000000000003c [ 29.062169][ T310] RAX: ffffffffffffffda RBX: 0000200000000040 RCX: 00007fd68d073d79 [ 29.070146][ T310] RDX: 00007fd68d085557 RSI: 0000000000000000 RDI: 0000000000000000 [ 29.078213][ T310] RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000023800000 [ 29.086209][ T310] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffc4c17bd28 [ 29.094189][ T310] R13: 0000000000000002 R14: 00007fd68d104ca0 R15: 0000000000000002 [ 29.102174][ T310] [ 29.104512][ T310] Allocated by task 309: [ 29.108768][ T310] __kasan_kmalloc+0xd4/0x100 [ 29.113453][ T310] __kmalloc+0x19f/0x330 [ 29.117701][ T310] l2tp_session_create+0x39/0xb60 [ 29.122731][ T310] pppol2tp_connect+0xbf5/0x1640 [ 29.127689][ T310] __sys_connect+0x3ce/0x450 [ 29.132282][ T310] __x64_sys_connect+0x7a/0x90 [ 29.137052][ T310] do_syscall_64+0x31/0x40 [ 29.141485][ T310] entry_SYSCALL_64_after_hwframe+0x61/0xcb [ 29.147373][ T310] [ 29.149708][ T310] Freed by task 112: [ 29.153605][ T310] kasan_set_track+0x4a/0x70 [ 29.158196][ T310] kasan_set_free_info+0x23/0x40 [ 29.163158][ T310] ____kasan_slab_free+0x125/0x160 [ 29.168271][ T310] __kasan_slab_free+0x11/0x20 [ 29.173063][ T310] slab_free_freelist_hook+0xc5/0x190 [ 29.178455][ T310] kfree+0xc0/0x270 [ 29.182266][ T310] l2tp_session_put+0xb2/0x1a0 [ 29.187041][ T310] l2tp_session_delete+0x3a9/0x4a0 [ 29.192157][ T310] l2tp_tunnel_del_work+0x180/0x3d0 [ 29.197357][ T310] process_one_work+0x6fd/0xbc0 [ 29.202208][ T310] worker_thread+0xa8e/0x13c0 [ 29.206895][ T310] kthread+0x324/0x3b0 [ 29.211015][ T310] ret_from_fork+0x1f/0x30 [ 29.215461][ T310] [ 29.217797][ T310] The buggy address belongs to the object at ffff8881002f3400 [ 29.217797][ T310] which belongs to the cache kmalloc-512 of size 512 [ 29.231856][ T310] The buggy address is located 0 bytes inside of [ 29.231856][ T310] 512-byte region [ffff8881002f3400, ffff8881002f3600) [ 29.244975][ T310] The buggy address belongs to the page: [ 29.250642][ T310] page:ffffea000400bc00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1002f0 [ 29.260880][ T310] head:ffffea000400bc00 order:2 compound_mapcount:0 compound_pincount:0 [ 29.269227][ T310] flags: 0x4000000000010200(slab|head) [ 29.274703][ T310] raw: 4000000000010200 dead000000000100 dead000000000122 ffff888100043080 [ 29.283301][ T310] raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000 [ 29.291891][ T310] page dumped because: kasan: bad access detected [ 29.298445][ T310] page_owner tracks the page as allocated [ 29.304209][ T310] page last allocated via order 0, migratetype Unmovable, gfp_mask 0x0(), pid 1, ts 1117754180, free_ts 0 [ 29.315530][ T310] register_early_stack+0x95/0xf0 [ 29.320563][ T310] init_page_owner+0x32/0x800 [ 29.325250][ T310] page_ext_init+0x3c1/0x407 [ 29.329849][ T310] kernel_init_freeable+0x287/0x3c3 [ 29.335051][ T310] page_owner free stack trace missing [ 29.340423][ T310] [ 29.342754][ T310] Memory state around the buggy address: [ 29.348387][ T310] ffff8881002f3300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 29.356454][ T310] ffff8881002f3380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 29.364547][ T310] >ffff8881002f3400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 29.372607][ T310] ^ [ 29.376690][ T310] ffff8881002f3480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 29.384753][ T310] ffff8881002f3500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 29.392813][ T310] ================================================================== [ 29.400872][ T310] Disabling lock debugging due to kernel taint [ 29.407330][ T310] ------------[ cut here ]------------ [ 29.413181][ T310] WARNING: CPU: 1 PID: 310 at net/l2tp/l2tp_ppp.c:156 pppol2tp_sock_to_session+0x167/0x1b0 [ 29.423258][ T24] audit: type=1400 audit(1790701519.110:68): avc: denied { read } for pid=76 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 [ 29.424815][ T310] Modules linked in: [ 29.444975][ T24] audit: type=1400 audit(1790701519.110:69): avc: denied { search } for pid=76 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 [ 29.449655][ T310] CPU: 0 PID: 310 Comm: syz-executor274 Tainted: G B syzkaller #0 [ 29.470242][ T24] audit: type=1400 audit(1790701519.110:70): avc: denied { write } for pid=76 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 [ 29.479405][ T310] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026 [ 29.500890][ T24] audit: type=1400 audit(1790701519.110:71): avc: denied { add_name } for pid=76 comm="syslogd" name="messages" scontext=system_u:system_r:syslogd_t tcontext=system_u:object_r:tmpfs_t tclass=dir permissive=1 [ 29.511047][ T310] RIP: 0010:pppol2tp_sock_to_session+0x167/0x1b0 [ 29.531572][ T24] audit: type=1400 audit(1790701519.110:72): avc: denied { create } for pid=76 comm="syslogd" name="messages" scontext=system_u:system_r:syslogd_t tcontext=system_u:object_r:tmpfs_t tclass=file permissive=1 [ 29.537888][ T310] Code: 5d c3 e8 fc 61 35 fd be 02 00 00 00 eb 0a e8 f0 61 35 fd be 01 00 00 00 4c 89 f7 e8 e3 cf 0e fe e9 0f ff ff ff e8 d9 61 35 fd <0f> 0b 48 89 df e8 ef 00 00 00 eb bd e8 c8 61 35 fd 4c 89 f7 be 03 [ 29.558455][ T24] audit: type=1400 audit(1790701519.110:73): avc: denied { append open } for pid=76 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 [ 29.577840][ T310] RSP: 0018:ffffc90000ad7c40 EFLAGS: 00010293 [ 29.606556][ T310] RAX: ffffffff842f5337 RBX: ffff88811edfd000 RCX: ffff88811f27e400 [ 29.614621][ T310] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000000c04eb7d [ 29.622643][ T310] RBP: ffffc90000ad7c60 R08: 0000000000000003 R09: 0000000000000004 [ 29.630658][ T310] R10: dffffc0000000000 R11: fffffbfff0dcf848 R12: dffffc0000000000 [ 29.638626][ T310] R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881002f3400 [ 29.646670][ T310] FS: 0000000000000000(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 [ 29.655628][ T310] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 29.662388][ T310] CR2: 00007fd68d0854f0 CR3: 000000010cf85000 CR4: 00000000003506b0 [ 29.670391][ T310] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 29.678361][ T310] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 29.686397][ T310] Call Trace: [ 29.689715][ T310] pppol2tp_release+0x150/0x2b0 [ 29.694557][ T310] sock_close+0xb8/0x200 [ 29.698896][ T310] ? sock_mmap+0xa0/0xa0 [ 29.703180][ T310] __fput+0x2dc/0x730 [ 29.707187][ T310] ____fput+0x15/0x20 [ 29.711224][ T310] task_work_run+0x127/0x190 [ 29.715834][ T310] do_exit+0xa7c/0x24e0 [ 29.720044][ T310] ? __kasan_check_write+0x14/0x20 [ 29.725175][ T310] ? switch_fpu_return+0x19c/0x330 [ 29.730336][ T310] ? put_task_struct+0x90/0x90 [ 29.735114][ T310] ? fpu__clear_all+0x20/0x20 [ 29.739834][ T310] ? __kasan_check_read+0x11/0x20 [ 29.744874][ T310] __x64_sys_exit+0x40/0x40 [ 29.749428][ T310] do_syscall_64+0x31/0x40 [ 29.753889][ T310] entry_SYSCALL_64_after_hwframe+0x61/0xcb [ 29.759835][ T310] RIP: 0033:0x7fd68d073d79 [ 29.764286][ T310] Code: Unable to access opcode bytes at RIP 0x7fd68d073d4f. [ 29.771694][ T310] RSP: 002b:00007ffc4c17bb08 EFLAGS: 00000246 ORIG_RAX: 000000000000003c [ 29.780142][ T310] RAX: ffffffffffffffda RBX: 0000200000000040 RCX: 00007fd68d073d79 [ 29.788120][ T310] RDX: 00007fd68d085557 RSI: 0000000000000000 RDI: 0000000000000000 [ 29.796146][ T310] RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000023800000 [ 29.804166][ T310] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffc4c17bd28 [ 29.812190][ T310] R13: 0000000000000002 R14: 00007fd68d104ca0 R15: 0000000000000002 [ 29.8201