ci2-android-5-10/strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ci2-android-5-10/syz-executor2488968474 <...> Warning: Permanently added '10.128.0.99' (ED25519) to the list of known hosts. execve("ci2-android-5-10/syz-executor2488968474", ["ci2-android-5-10/syz-executor2488968474"], 0x7ffee8500ec0 /* 10 vars */) = 0 brk(NULL) = 0x55556a328000 brk(0x55556a328d40) = 0x55556a328d40 arch_prctl(ARCH_SET_FS, 0x55556a3283c0) = 0 set_tid_address(0x55556a328690) = 297 set_robust_list(0x55556a3286a0, 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-executor2488968474", 4096) = 45 getrandom("\x31\x13\x4a\xd4\xdc\xd1\xa6\xf3", 8, GRND_NONBLOCK) = 8 brk(NULL) = 0x55556a328d40 brk(0x55556a349d40) = 0x55556a349d40 brk(0x55556a34a000) = 0x55556a34a000 mprotect(0x7eff78dce000, 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) = 298 ioctl(3, PPPIOCSMRU, 0) = -1 ENOSYS (Function not implemented) exit_group(0) = ? +++ exited with 0 +++ [ 27.281019][ T24] audit: type=1400 audit(1788648383.920:64): avc: denied { execmem } for pid=297 comm="syz-executor248" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1 [ 27.300694][ T24] audit: type=1400 audit(1788648383.920:65): avc: denied { create } for pid=297 comm="syz-executor248" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=pppox_socket permissive=1 [ 27.321606][ T24] audit: type=1400 audit(1788648383.920:66): avc: denied { connect } for pid=297 comm="syz-executor248" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=pppox_socket permissive=1 [ 27.341885][ T24] audit: type=1400 audit(1788648383.950:67): avc: denied { ioctl } for pid=297 comm="syz-executor248" path="socket:[14081]" dev="sockfs" ino=14081 ioctlcmd=0x7452 scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=pppox_socket permissive=1 [ 27.472519][ T298] ================================================================== [ 27.480636][ T298] BUG: KASAN: use-after-free in pppol2tp_sock_to_session+0x1a0/0x1b0 [ 27.488787][ T298] Read of size 4 at addr ffff88810ab20400 by task syz-executor248/298 [ 27.496924][ T298] [ 27.499295][ T298] CPU: 1 PID: 298 Comm: syz-executor248 Not tainted syzkaller #0 [ 27.507005][ T298] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 [ 27.517053][ T298] Call Trace: [ 27.520346][ T298] __dump_stack+0x21/0x24 [ 27.524672][ T298] dump_stack_lvl+0x1a7/0x208 [ 27.529344][ T298] ? show_regs_print_info+0x18/0x18 [ 27.534540][ T298] ? thaw_kernel_threads+0x220/0x220 [ 27.539822][ T298] ? __local_bh_enable_ip+0x53/0x80 [ 27.545016][ T298] print_address_description+0x7f/0x2c0 [ 27.550596][ T298] ? pppol2tp_sock_to_session+0x1a0/0x1b0 [ 27.556309][ T298] kasan_report+0x100/0x140 [ 27.560813][ T298] ? pppol2tp_sock_to_session+0x1a0/0x1b0 [ 27.566615][ T298] __asan_report_load4_noabort+0x14/0x20 [ 27.572540][ T298] pppol2tp_sock_to_session+0x1a0/0x1b0 [ 27.578085][ T298] pppol2tp_release+0x150/0x2b0 [ 27.582936][ T298] sock_close+0xb8/0x200 [ 27.587176][ T298] ? sock_mmap+0xa0/0xa0 [ 27.591514][ T298] __fput+0x2dc/0x730 [ 27.595508][ T298] ____fput+0x15/0x20 [ 27.599494][ T298] task_work_run+0x127/0x190 [ 27.604099][ T298] do_exit+0xa7c/0x24e0 [ 27.608259][ T298] ? __kasan_check_write+0x14/0x20 [ 27.613371][ T298] ? switch_fpu_return+0x19c/0x330 [ 27.618479][ T298] ? put_task_struct+0x90/0x90 [ 27.623606][ T298] ? fpu__clear_all+0x20/0x20 [ 27.628290][ T298] ? __kasan_check_read+0x11/0x20 [ 27.633539][ T298] __x64_sys_exit+0x40/0x40 [ 27.638135][ T298] do_syscall_64+0x31/0x40 [ 27.642554][ T298] entry_SYSCALL_64_after_hwframe+0x61/0xcb [ 27.648547][ T298] RIP: 0033:0x7eff78d3dd79 [ 27.653148][ T298] Code: Unable to access opcode bytes at RIP 0x7eff78d3dd4f. [ 27.660518][ T298] RSP: 002b:00007ffcaf5cedd8 EFLAGS: 00000246 ORIG_RAX: 000000000000003c [ 27.669330][ T298] RAX: ffffffffffffffda RBX: 0000200000000040 RCX: 00007eff78d3dd79 [ 27.677474][ T298] RDX: 00007eff78d4f557 RSI: 0000000000000000 RDI: 0000000000000000 [ 27.685499][ T298] RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000023800000 [ 27.693489][ T298] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffcaf5ceff8 [ 27.701489][ T298] R13: 0000000000000002 R14: 00007eff78dceca0 R15: 0000000000000002 [ 27.709472][ T298] [ 27.711804][ T298] Allocated by task 297: [ 27.716253][ T298] __kasan_kmalloc+0xd4/0x100 [ 27.720961][ T298] __kmalloc+0x19f/0x330 [ 27.725800][ T298] l2tp_session_create+0x39/0xb60 [ 27.730830][ T298] pppol2tp_connect+0xbf5/0x1640 [ 27.735766][ T298] __sys_connect+0x3ce/0x450 [ 27.740349][ T298] __x64_sys_connect+0x7a/0x90 [ 27.745123][ T298] do_syscall_64+0x31/0x40 [ 27.749745][ T298] entry_SYSCALL_64_after_hwframe+0x61/0xcb [ 27.755770][ T298] [ 27.758109][ T298] Freed by task 291: [ 27.762018][ T298] kasan_set_track+0x4a/0x70 [ 27.766611][ T298] kasan_set_free_info+0x23/0x40 [ 27.771550][ T298] ____kasan_slab_free+0x125/0x160 [ 27.776850][ T298] __kasan_slab_free+0x11/0x20 [ 27.781634][ T298] slab_free_freelist_hook+0xc5/0x190 [ 27.787113][ T298] kfree+0xc0/0x270 [ 27.790933][ T298] l2tp_session_put+0xb2/0x1a0 [ 27.796064][ T298] l2tp_session_delete+0x3a9/0x4a0 [ 27.802021][ T298] l2tp_tunnel_del_work+0x180/0x3d0 [ 27.807221][ T298] process_one_work+0x6fd/0xbc0 [ 27.812066][ T298] worker_thread+0xa8e/0x13c0 [ 27.816735][ T298] kthread+0x324/0x3b0 [ 27.820799][ T298] ret_from_fork+0x1f/0x30 [ 27.825236][ T298] [ 27.827561][ T298] Last potentially related work creation: [ 27.833352][ T298] kasan_save_stack+0x3a/0x60 [ 27.838045][ T298] __kasan_record_aux_stack+0xd2/0x100 [ 27.843501][ T298] kasan_record_aux_stack_noalloc+0xb/0x10 [ 27.849312][ T298] call_rcu+0x11a/0x1090 [ 27.853668][ T298] blkg_release+0x23/0x30 [ 27.858033][ T298] percpu_ref_switch_to_atomic_rcu+0x5a3/0x5b0 [ 27.864182][ T298] rcu_do_batch+0x488/0xaf0 [ 27.868871][ T298] rcu_core+0x50a/0xca0 [ 27.873024][ T298] rcu_core_si+0x9/0x10 [ 27.877262][ T298] __do_softirq+0x255/0x563 [ 27.881755][ T298] [ 27.884254][ T298] The buggy address belongs to the object at ffff88810ab20400 [ 27.884254][ T298] which belongs to the cache kmalloc-512 of size 512 [ 27.898399][ T298] The buggy address is located 0 bytes inside of [ 27.898399][ T298] 512-byte region [ffff88810ab20400, ffff88810ab20600) [ 27.911625][ T298] The buggy address belongs to the page: [ 27.917298][ T298] page:ffffea00042ac800 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10ab20 [ 27.928281][ T298] head:ffffea00042ac800 order:2 compound_mapcount:0 compound_pincount:0 [ 27.936769][ T298] flags: 0x4000000000010200(slab|head) [ 27.942242][ T298] raw: 4000000000010200 ffffea00042a9500 0000000700000007 ffff888100043080 [ 27.950833][ T298] raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000 [ 27.959636][ T298] page dumped because: kasan: bad access detected [ 27.966129][ T298] page_owner tracks the page as allocated [ 27.972073][ T298] 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, ts 2498890376, free_ts 0 [ 27.991718][ T298] prep_new_page+0x176/0x190 [ 27.996327][ T298] get_page_from_freelist+0x225f/0x23f0 [ 28.002280][ T298] __alloc_pages_nodemask+0x29a/0x640 [ 28.008164][ T298] new_slab+0x84/0x3f0 [ 28.012334][ T298] ___slab_alloc+0x2f8/0x4c0 [ 28.017026][ T298] __slab_alloc+0x63/0xa0 [ 28.021369][ T298] kmem_cache_alloc_trace+0x1a8/0x2e0 [ 28.026749][ T298] blkg_alloc+0x6d/0x570 [ 28.031023][ T298] blkcg_init_queue+0x2d/0x330 [ 28.035790][ T298] blk_alloc_queue+0x444/0x5f0 [ 28.040556][ T298] blk_mq_init_queue+0x37/0xd0 [ 28.045320][ T298] scsi_mq_alloc_queue+0x42/0x140 [ 28.050341][ T298] scsi_alloc_sdev+0x611/0x920 [ 28.055103][ T298] scsi_probe_and_add_lun+0x17d/0x3370 [ 28.060556][ T298] __scsi_scan_target+0x1d2/0xbf0 [ 28.065574][ T298] scsi_scan_host_selected+0x34e/0x600 [ 28.071023][ T298] page_owner free stack trace missing [ 28.076389][ T298] [ 28.078717][ T298] Memory state around the buggy address: [ 28.084428][ T298] ffff88810ab20300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 28.092755][ T298] ffff88810ab20380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 28.100818][ T298] >ffff88810ab20400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 28.108966][ T298] ^ [ 28.113036][ T298] ffff88810ab20480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 28.121092][ T298] ffff88810ab20500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 28.129149][ T298] ================================================================== [ 28.137204][ T298] Disabling lock debugging due to kernel taint [ 28.143655][ T298] ------------[ cut here ]------------ [ 28.149195][ T298] WARNING: CPU: 1 PID: 298 at net/l2tp/l2tp_ppp.c:156 pppol2tp_sock_to_session+0x167/0x1b0 [ 28.159199][ T298] Modules linked in: [ 28.163132][ T24] audit: type=1400 audit(1788648384.800:68): 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 [ 28.167010][ T298] CPU: 0 PID: 298 Comm: syz-executor248 Tainted: G B syzkaller #0 [ 28.184879][ T24] audit: type=1400 audit(1788648384.800:69): 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 [ 28.195822][ T298] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 [ 28.216139][ T24] audit: type=1400 audit(1788648384.800:70): 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 [ 28.226993][ T298] RIP: 0010:pppol2tp_sock_to_session+0x167/0x1b0 [ 28.247696][ T24] audit: type=1400 audit(1788648384.800:71): 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 [ 28.254757][ T298] Code: 5d c3 e8 2c 5a 35 fd be 02 00 00 00 eb 0a e8 20 5a 35 fd be 01 00 00 00 4c 89 f7 e8 63 ca 0e fe e9 0f ff ff ff e8 09 5a 35 fd <0f> 0b 48 89 df e8 ef 00 00 00 eb bd e8 f8 59 35 fd 4c 89 f7 be 03 [ 28.274450][ T24] audit: type=1400 audit(1788648384.800:72): 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 [ 28.294595][ T298] RSP: 0018:ffffc90000b27c40 EFLAGS: 00010293 [ 28.314811][ T24] audit: type=1400 audit(1788648384.800:73): 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 [ 28.314814][ T298] [ 28.314852][ T298] RAX: ffffffff842f5aa7 RBX: ffff88810b1c3800 RCX: ffff888120f88000 [ 28.354156][ T298] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000000c04eb7d [ 28.362174][ T298] RBP: ffffc90000b27c60 R08: 0000000000000003 R09: 0000000000000004 [ 28.370190][ T298] R10: dffffc0000000000 R11: fffffbfff0dcf848 R12: dffffc0000000000 [ 28.378243][ T298] R13: dffffc0000000000 R14: 0000000000000000 R15: ffff88810ab20400 [ 28.386233][ T298] FS: 0000000000000000(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 [ 28.395212][ T298] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 28.401823][ T298] CR2: 00000000006aa5b0 CR3: 000000010d5de000 CR4: 00000000003506b0 [ 28.409846][ T298] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 28.417844][ T298] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 28.425986][ T298] Call Trace: [ 28.429342][ T298] pppol2tp_release+0x150/0x2b0 [ 28.434229][ T298] sock_close+0xb8/0x200 [ 28.438527][ T298] ? sock_mmap+0xa0/0xa0 [ 28.442790][ T298] __fput+0x2dc/0x730 [ 28.446772][ T298] ____fput+0x15/0x20 [ 28.450806][ T298] task_work_run+0x127/0x190 [ 28.455418][ T298] do_exit+0xa7c/0x24e0 [ 28.459617][ T298] ? __kasan_check_write+0x14/0x20 [ 28.464772][ T298] ? switch_fpu_return+0x19c/0x330 [ 28.470025][ T298] ? put_task_struct+0x90/0x90 [ 28.474818][ T298] ? fpu__clear_all+0x20/0x20 [ 28.479558][ T298] ? __kasan_check_read+0x11/0x20 [ 28.484833][ T298] __x64_sys_exit+0x40/0x40 [ 28.489635][ T298] do_syscall_64+0x31/0x40 [ 28.494106][ T298] entry_SYSCALL_64_after_hwframe+0x61/0xcb [ 28.500531][ T298] RIP: 0033:0x7eff78d3dd79 [ 28.504968][ T298] Code: Unable to access opcode bytes at RIP 0x7eff78d3dd4f. [ 28.512404][ T298] RSP: 002b:00007ffcaf5cedd8 EFLAGS: 00000246 ORIG_RAX: 000000000000003c [ 28.520967][ T298] RAX: ffffffffffffffda RBX: 0000200000000040 RCX: