ci2-android-5-10/strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ci2-android-5-10/syz-executor227604051 <...> Warning: Permanently added '10.128.1.87' (ED25519) to the list of known hosts. execve("ci2-android-5-10/syz-executor227604051", ["ci2-android-5-10/syz-executor227604051"], 0x7ffc4ff19330 /* 10 vars */) = 0 brk(NULL) = 0x555578729000 brk(0x555578729d40) = 0x555578729d40 arch_prctl(ARCH_SET_FS, 0x5555787293c0) = 0 set_tid_address(0x555578729690) = 297 set_robust_list(0x5555787296a0, 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-executor227604051", 4096) = 44 getrandom("\x9a\xc9\x35\xf7\xc5\x01\xda\xc3", 8, GRND_NONBLOCK) = 8 brk(NULL) = 0x555578729d40 brk(0x55557874ad40) = 0x55557874ad40 brk(0x55557874b000) = 0x55557874b000 mprotect(0x7f9b9158f000, 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 +++ [ 24.665281][ T24] audit: type=1400 audit(1788357499.720:64): avc: denied { execmem } for pid=297 comm="syz-executor227" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1 [ 24.684805][ T24] audit: type=1400 audit(1788357499.730:65): avc: denied { create } for pid=297 comm="syz-executor227" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=pppox_socket permissive=1 [ 24.705036][ T24] audit: type=1400 audit(1788357499.730:66): avc: denied { connect } for pid=297 comm="syz-executor227" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=pppox_socket permissive=1 [ 24.724988][ T24] audit: type=1400 audit(1788357499.740:67): avc: denied { ioctl } for pid=297 comm="syz-executor227" path="socket:[14117]" dev="sockfs" ino=14117 ioctlcmd=0x7452 scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=pppox_socket permissive=1 [ 24.855638][ T298] ================================================================== [ 24.863732][ T298] BUG: KASAN: use-after-free in pppol2tp_sock_to_session+0x1a0/0x1b0 [ 24.871770][ T298] Read of size 4 at addr ffff88810ab23000 by task syz-executor227/298 [ 24.879910][ T298] [ 24.882237][ T298] CPU: 0 PID: 298 Comm: syz-executor227 Not tainted syzkaller #0 [ 24.889945][ T298] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 [ 24.899990][ T298] Call Trace: [ 24.903262][ T298] __dump_stack+0x21/0x24 [ 24.907563][ T298] dump_stack_lvl+0x1a7/0x208 [ 24.912221][ T298] ? show_regs_print_info+0x18/0x18 [ 24.917396][ T298] ? thaw_kernel_threads+0x220/0x220 [ 24.922661][ T298] ? __local_bh_enable_ip+0x53/0x80 [ 24.927831][ T298] print_address_description+0x7f/0x2c0 [ 24.933357][ T298] ? pppol2tp_sock_to_session+0x1a0/0x1b0 [ 24.939073][ T298] kasan_report+0x100/0x140 [ 24.943556][ T298] ? pppol2tp_sock_to_session+0x1a0/0x1b0 [ 24.949249][ T298] __asan_report_load4_noabort+0x14/0x20 [ 24.954865][ T298] pppol2tp_sock_to_session+0x1a0/0x1b0 [ 24.960476][ T298] pppol2tp_release+0x150/0x2b0 [ 24.965301][ T298] sock_close+0xb8/0x200 [ 24.969534][ T298] ? sock_mmap+0xa0/0xa0 [ 24.973768][ T298] __fput+0x2dc/0x730 [ 24.977728][ T298] ____fput+0x15/0x20 [ 24.981690][ T298] task_work_run+0x127/0x190 [ 24.986274][ T298] do_exit+0xa7c/0x24e0 [ 24.990405][ T298] ? __kasan_check_write+0x14/0x20 [ 24.995487][ T298] ? switch_fpu_return+0x19c/0x330 [ 25.000570][ T298] ? put_task_struct+0x90/0x90 [ 25.005302][ T298] ? fpu__clear_all+0x20/0x20 [ 25.009956][ T298] ? __kasan_check_read+0x11/0x20 [ 25.014956][ T298] __x64_sys_exit+0x40/0x40 [ 25.019428][ T298] do_syscall_64+0x31/0x40 [ 25.023815][ T298] entry_SYSCALL_64_after_hwframe+0x61/0xcb [ 25.029678][ T298] RIP: 0033:0x7f9b914fed79 [ 25.034061][ T298] Code: Unable to access opcode bytes at RIP 0x7f9b914fed4f. [ 25.041398][ T298] RSP: 002b:00007ffe3e0d5898 EFLAGS: 00000246 ORIG_RAX: 000000000000003c [ 25.049788][ T298] RAX: ffffffffffffffda RBX: 0000200000000040 RCX: 00007f9b914fed79 [ 25.057735][ T298] RDX: 00007f9b91510557 RSI: 0000000000000000 RDI: 0000000000000000 [ 25.065680][ T298] RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000023800000 [ 25.073654][ T298] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffe3e0d5ab8 [ 25.081625][ T298] R13: 0000000000000002 R14: 00007f9b9158fca0 R15: 0000000000000002 [ 25.089575][ T298] [ 25.091880][ T298] Allocated by task 297: [ 25.096109][ T298] __kasan_kmalloc+0xd4/0x100 [ 25.100759][ T298] __kmalloc+0x19f/0x330 [ 25.104990][ T298] l2tp_session_create+0x39/0xb60 [ 25.109985][ T298] pppol2tp_connect+0xbf5/0x1640 [ 25.114892][ T298] __sys_connect+0x3ce/0x450 [ 25.119449][ T298] __x64_sys_connect+0x7a/0x90 [ 25.124181][ T298] do_syscall_64+0x31/0x40 [ 25.128576][ T298] entry_SYSCALL_64_after_hwframe+0x61/0xcb [ 25.134524][ T298] [ 25.136829][ T298] Freed by task 49: [ 25.140612][ T298] kasan_set_track+0x4a/0x70 [ 25.145179][ T298] kasan_set_free_info+0x23/0x40 [ 25.150087][ T298] ____kasan_slab_free+0x125/0x160 [ 25.155174][ T298] __kasan_slab_free+0x11/0x20 [ 25.159908][ T298] slab_free_freelist_hook+0xc5/0x190 [ 25.165284][ T298] kfree+0xc0/0x270 [ 25.169283][ T298] l2tp_session_put+0xb2/0x1a0 [ 25.174040][ T298] l2tp_session_delete+0x3a9/0x4a0 [ 25.179124][ T298] l2tp_tunnel_del_work+0x180/0x3d0 [ 25.184295][ T298] process_one_work+0x6fd/0xbc0 [ 25.189118][ T298] worker_thread+0xa8e/0x13c0 [ 25.193769][ T298] kthread+0x324/0x3b0 [ 25.197810][ T298] ret_from_fork+0x1f/0x30 [ 25.202193][ T298] [ 25.204515][ T298] Last potentially related work creation: [ 25.210204][ T298] kasan_save_stack+0x3a/0x60 [ 25.214852][ T298] __kasan_record_aux_stack+0xd2/0x100 [ 25.220299][ T298] kasan_record_aux_stack_noalloc+0xb/0x10 [ 25.226076][ T298] call_rcu+0x11a/0x1090 [ 25.230287][ T298] blkg_release+0x23/0x30 [ 25.234589][ T298] percpu_ref_switch_to_atomic_rcu+0x5a3/0x5b0 [ 25.240738][ T298] rcu_do_batch+0x488/0xaf0 [ 25.245208][ T298] rcu_core+0x50a/0xca0 [ 25.249331][ T298] rcu_core_si+0x9/0x10 [ 25.253456][ T298] __do_softirq+0x255/0x563 [ 25.257923][ T298] [ 25.260223][ T298] The buggy address belongs to the object at ffff88810ab23000 [ 25.260223][ T298] which belongs to the cache kmalloc-512 of size 512 [ 25.274247][ T298] The buggy address is located 0 bytes inside of [ 25.274247][ T298] 512-byte region [ffff88810ab23000, ffff88810ab23200) [ 25.287311][ T298] The buggy address belongs to the page: [ 25.292950][ T298] page:ffffea00042ac800 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10ab20 [ 25.303153][ T298] head:ffffea00042ac800 order:2 compound_mapcount:0 compound_pincount:0 [ 25.311460][ T298] flags: 0x4000000000010200(slab|head) [ 25.316908][ T298] raw: 4000000000010200 0000000000000000 0000001000000001 ffff888100043080 [ 25.325462][ T298] raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000 [ 25.334098][ T298] page dumped because: kasan: bad access detected [ 25.340487][ T298] page_owner tracks the page as allocated [ 25.346178][ 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 1757904504, free_ts 0 [ 25.364025][ T298] prep_new_page+0x176/0x190 [ 25.368583][ T298] get_page_from_freelist+0x225f/0x23f0 [ 25.374096][ T298] __alloc_pages_nodemask+0x29a/0x640 [ 25.379433][ T298] new_slab+0x84/0x3f0 [ 25.383471][ T298] ___slab_alloc+0x2f8/0x4c0 [ 25.388026][ T298] __slab_alloc+0x63/0xa0 [ 25.392329][ T298] kmem_cache_alloc_trace+0x1a8/0x2e0 [ 25.397667][ T298] blkg_alloc+0x6d/0x570 [ 25.401877][ T298] blkcg_init_queue+0x2d/0x330 [ 25.406610][ T298] blk_alloc_queue+0x444/0x5f0 [ 25.411342][ T298] blk_mq_init_queue+0x37/0xd0 [ 25.416179][ T298] scsi_mq_alloc_queue+0x42/0x140 [ 25.421174][ T298] scsi_alloc_sdev+0x611/0x920 [ 25.426008][ T298] scsi_probe_and_add_lun+0x17d/0x3370 [ 25.431435][ T298] __scsi_scan_target+0x1d2/0xbf0 [ 25.436431][ T298] scsi_scan_host_selected+0x34e/0x600 [ 25.441854][ T298] page_owner free stack trace missing [ 25.447192][ T298] [ 25.449509][ T298] Memory state around the buggy address: [ 25.455123][ T298] ffff88810ab22f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 25.463156][ T298] ffff88810ab22f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 25.471189][ T298] >ffff88810ab23000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 25.479216][ T298] ^ [ 25.483269][ T298] ffff88810ab23080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 25.491325][ T298] ffff88810ab23100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 25.499370][ T298] ================================================================== [ 25.507410][ T298] Disabling lock debugging due to kernel taint [ 25.513736][ T298] ------------[ cut here ]------------ [ 25.519504][ T298] WARNING: CPU: 0 PID: 298 at net/l2tp/l2tp_ppp.c:156 pppol2tp_sock_to_session+0x167/0x1b0 [ 25.529488][ T298] Modules linked in: [ 25.533364][ T24] audit: type=1400 audit(1788357500.590:68): 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 [ 25.533378][ T24] audit: type=1400 audit(1788357500.590:69): 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 [ 25.533389][ T24] audit: type=1400 audit(1788357500.590:70): 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 [ 25.533408][ T24] audit: type=1400 audit(1788357500.590:71): 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 [ 25.555017][ T298] CPU: 0 PID: 298 Comm: syz-executor227 Tainted: G B syzkaller #0 [ 25.577563][ T24] audit: type=1400 audit(1788357500.590:72): 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 [ 25.597274][ T298] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 [ 25.617797][ T24] audit: type=1400 audit(1788357500.590:73): 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 [ 25.626769][ T298] RIP: 0010:pppol2tp_sock_to_session+0x167/0x1b0 [ 25.686125][ T298] Code: 5d c3 e8 1c 73 35 fd be 02 00 00 00 eb 0a e8 10 73 35 fd be 01 00 00 00 4c 89 f7 e8 33 df 0e fe e9 0f ff ff ff e8 f9 72 35 fd <0f> 0b 48 89 df e8 ef 00 00 00 eb bd e8 e8 72 35 fd 4c 89 f7 be 03 [ 25.705831][ T298] RSP: 0018:ffffc9000096fc40 EFLAGS: 00010293 [ 25.711939][ T298] RAX: ffffffff842f41b7 RBX: ffff88810b2ee800 RCX: ffff88810b1f93c0 [ 25.719910][ T298] RDX: 0000000000000000 RSI: 000000000abcda00 RDI: 000000000c04eb7d [ 25.727864][ T298] RBP: ffffc9000096fc60 R08: 0000000000000003 R09: 0000000000000004 [ 25.735838][ T298] R10: dffffc0000000000 R11: fffffbfff0dcf848 R12: dffffc0000000000 [ 25.743812][ T298] R13: dffffc0000000000 R14: 000000000abcda00 R15: ffff88810ab23000 [ 25.751781][ T298] FS: 0000000000000000(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 [ 25.760699][ T298] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 25.767277][ T298] CR2: 00007f9b9154ce20 CR3: 000000010cf3d000 CR4: 00000000003506b0 [ 25.775250][ T298] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 25.783217][ T298] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 25.791185][ T298] Call Trace: [ 25.794471][ T298] pppol2tp_release+0x150/0x2b0 [ 25.799307][ T298] sock_close+0xb8/0x200 [ 25.803632][ T298] ? sock_mmap+0xa0/0xa0 [ 25.807857][ T298] __fput+0x2dc/0x730 [ 25.811836][ T298] ____fput+0x15/0x20 [ 25.815802][ T298] task_work_run+0x127/0x190 [ 25.820391][ T298] do_exit+0xa7c/0x24e0 [ 25.824550][ T298] ? __kasan_check_write+0x14/0x20 [ 25.829634][ T298] ? switch_fpu_return+0x19c/0x330 [ 25.834755][ T298] ? put_task_struct+0x90/0x90 [ 25.839538][ T298] ? fpu__clear_all+0x20/0x20 [ 25.844223][ T298] ? __kasan_check_read+0x11/0x20 [ 25.849239][ T298] __x64_sys_exit+0x40/0x40 [ 25.853774][ T298] do_syscall_64+0x31/0x40 [ 25.858177][ T298] entry_SYSCALL_64_after_hwframe+0x61/0xcb [ 25.864065][ T298] RIP: 0033:0x7f9b914fed79 [ 25.868458][ T298] Code: Unable to access opcode bytes at RIP 0x7f9b914fed4f. [ 25.875821][ T298] RSP: 002b:00007ffe3e0d5898 EFLAGS: 00000246 ORIG_RAX: 000000000000003c [ 25.884234][ T298] RAX: ffffffffffffffda RBX: 0000200000000040 RCX: 00007f9b914fed79 [ 25.892218][ T298] RDX: 00007f9b91510557 RSI: 0000000000000000 RDI: 0000000000000000 [ 25.900199][ T298] RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000023800000 [ 25.908142][ T298] R