ci2-android-5-10/strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ci2-android-5-10/syz-executor1976836527 <...> Warning: Permanently added '10.128.1.152' (ED25519) to the list of known hosts. execve("ci2-android-5-10/syz-executor1976836527", ["ci2-android-5-10/syz-executor1976836527"], 0x7ffd2fe97390 /* 10 vars */) = 0 brk(NULL) = 0x5555590e2000 brk(0x5555590e2d40) = 0x5555590e2d40 arch_prctl(ARCH_SET_FS, 0x5555590e23c0) = 0 set_tid_address(0x5555590e2690) = 297 set_robust_list(0x5555590e26a0, 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-executor1976836527", 4096) = 45 getrandom("\x72\x48\xd4\x08\x9e\xe1\x10\x27", 8, GRND_NONBLOCK) = 8 brk(NULL) = 0x5555590e2d40 brk(0x555559103d40) = 0x555559103d40 brk(0x555559104000) = 0x555559104000 mprotect(0x7fcd9854f000, 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\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 ioctl(3, SIOCGIFMTU, NULL) = -1 EFAULT (Bad address) exit_group(0) = ? [ 23.870182][ T24] audit: type=1400 audit(1785382020.240:64): avc: denied { execmem } for pid=297 comm="syz-executor197" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1 [ 23.889886][ T24] audit: type=1400 audit(1785382020.240:65): avc: denied { create } for pid=297 comm="syz-executor197" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=pppox_socket permissive=1 [ 23.910155][ T24] audit: type=1400 audit(1785382020.240:66): avc: denied { connect } for pid=297 comm="syz-executor197" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=pppox_socket permissive=1 [ 23.930108][ T24] audit: type=1400 audit(1785382020.260:67): avc: denied { ioctl } for pid=297 comm="syz-executor197" path="socket:[14132]" dev="sockfs" ino=14132 ioctlcmd=0x8921 scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=pppox_socket permissive=1 [ 23.955241][ T297] ================================================================== [ 23.963351][ T297] BUG: KASAN: use-after-free in pppol2tp_sock_to_session+0x1a0/0x1b0 [ 23.971410][ T297] Read of size 4 at addr ffff88810adf0800 by task syz-executor197/297 [ 23.979712][ T297] [ 23.982029][ T297] CPU: 1 PID: 297 Comm: syz-executor197 Not tainted syzkaller #0 [ 23.989733][ T297] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026 [ 23.999873][ T297] Call Trace: [ 24.003253][ T297] __dump_stack+0x21/0x24 [ 24.007586][ T297] dump_stack_lvl+0x1a7/0x208 [ 24.012273][ T297] ? show_regs_print_info+0x18/0x18 [ 24.017554][ T297] ? thaw_kernel_threads+0x220/0x220 [ 24.022846][ T297] ? __local_bh_enable_ip+0x53/0x80 [ 24.028040][ T297] print_address_description+0x7f/0x2c0 [ 24.033588][ T297] ? pppol2tp_sock_to_session+0x1a0/0x1b0 [ 24.039474][ T297] kasan_report+0x100/0x140 [ 24.044084][ T297] ? pppol2tp_sock_to_session+0x1a0/0x1b0 [ 24.049896][ T297] __asan_report_load4_noabort+0x14/0x20 [ 24.055602][ T297] pppol2tp_sock_to_session+0x1a0/0x1b0 [ 24.061146][ T297] pppol2tp_release+0x150/0x2b0 [ 24.066109][ T297] sock_close+0xb8/0x200 [ 24.070354][ T297] ? sock_mmap+0xa0/0xa0 [ 24.074587][ T297] __fput+0x2dc/0x730 [ 24.078554][ T297] ? _raw_spin_lock+0x94/0xf0 [ 24.083249][ T297] ____fput+0x15/0x20 [ 24.087235][ T297] task_work_run+0x127/0x190 [ 24.091809][ T297] do_exit+0xa7c/0x24e0 [ 24.095960][ T297] ? ptrace_notify+0x1ea/0x270 [ 24.100703][ T297] ? put_task_struct+0x90/0x90 [ 24.105535][ T297] ? do_notify_parent+0x810/0x810 [ 24.110545][ T297] do_group_exit+0x149/0x310 [ 24.115210][ T297] __x64_sys_exit_group+0x3f/0x40 [ 24.120306][ T297] do_syscall_64+0x31/0x40 [ 24.124711][ T297] entry_SYSCALL_64_after_hwframe+0x61/0xcb [ 24.130597][ T297] RIP: 0033:0x7fcd984be305 [ 24.135004][ T297] Code: Unable to access opcode bytes at RIP 0x7fcd984be2db. [ 24.142449][ T297] RSP: 002b:00007ffeaefb1c18 EFLAGS: 00000206 ORIG_RAX: 00000000000000e7 [ 24.150932][ T297] RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 00007fcd984be305 [ 24.159331][ T297] RDX: 00000000000000e7 RSI: ffffffffffffffd8 RDI: 0000000000000000 [ 24.167286][ T297] RBP: 0000000000000000 R08: 0000000000000000 R09: 00007ffeaefb1da8 [ 24.175258][ T297] R10: 000000000000000a R11: 0000000000000206 R12: 0000000000000000 [ 24.183330][ T297] R13: 00007fcd98554110 R14: 00007fcd985563a8 R15: 00007fcd985563c0 [ 24.191300][ T297] [ 24.193699][ T297] Allocated by task 297: [ 24.197927][ T297] __kasan_kmalloc+0xd4/0x100 [ 24.202592][ T297] __kmalloc+0x19f/0x330 [ 24.206869][ T297] l2tp_session_create+0x39/0xb60 [ 24.211874][ T297] pppol2tp_connect+0xbf5/0x1640 [ 24.216788][ T297] __sys_connect+0x3ce/0x450 [ 24.221518][ T297] __x64_sys_connect+0x7a/0x90 [ 24.226295][ T297] do_syscall_64+0x31/0x40 [ 24.230787][ T297] entry_SYSCALL_64_after_hwframe+0x61/0xcb [ 24.236656][ T297] [ 24.238966][ T297] Freed by task 49: [ 24.243024][ T297] kasan_set_track+0x4a/0x70 [ 24.247741][ T297] kasan_set_free_info+0x23/0x40 [ 24.252957][ T297] ____kasan_slab_free+0x125/0x160 [ 24.258113][ T297] __kasan_slab_free+0x11/0x20 [ 24.262891][ T297] slab_free_freelist_hook+0xc5/0x190 [ 24.268261][ T297] kfree+0xc0/0x270 [ 24.272083][ T297] l2tp_session_put+0xb2/0x1a0 [ 24.276838][ T297] l2tp_session_delete+0x3a9/0x4a0 [ 24.282006][ T297] l2tp_tunnel_del_work+0x180/0x3d0 [ 24.287217][ T297] process_one_work+0x6fd/0xbc0 [ 24.292275][ T297] worker_thread+0xa8e/0x13c0 [ 24.297060][ T297] kthread+0x324/0x3b0 [ 24.301161][ T297] ret_from_fork+0x1f/0x30 [ 24.305665][ T297] [ 24.308001][ T297] Last potentially related work creation: [ 24.313803][ T297] kasan_save_stack+0x3a/0x60 [ 24.318610][ T297] __kasan_record_aux_stack+0xd2/0x100 [ 24.324089][ T297] kasan_record_aux_stack_noalloc+0xb/0x10 [ 24.330088][ T297] call_rcu+0x11a/0x1090 [ 24.334467][ T297] blkg_release+0x23/0x30 [ 24.338901][ T297] percpu_ref_switch_to_atomic_rcu+0x5a3/0x5b0 [ 24.345068][ T297] rcu_do_batch+0x488/0xaf0 [ 24.349596][ T297] rcu_core+0x50a/0xca0 [ 24.353769][ T297] rcu_core_si+0x9/0x10 [ 24.358111][ T297] __do_softirq+0x255/0x563 [ 24.362621][ T297] [ 24.365064][ T297] The buggy address belongs to the object at ffff88810adf0800 [ 24.365064][ T297] which belongs to the cache kmalloc-512 of size 512 [ 24.379201][ T297] The buggy address is located 0 bytes inside of [ 24.379201][ T297] 512-byte region [ffff88810adf0800, ffff88810adf0a00) [ 24.392308][ T297] The buggy address belongs to the page: [ 24.398147][ T297] page:ffffea00042b7c00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10adf0 [ 24.408387][ T297] head:ffffea00042b7c00 order:2 compound_mapcount:0 compound_pincount:0 [ 24.416797][ T297] flags: 0x4000000000010200(slab|head) [ 24.422345][ T297] raw: 4000000000010200 dead000000000100 dead000000000122 ffff888100043080 [ 24.431596][ T297] raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000 [ 24.440379][ T297] page dumped because: kasan: bad access detected [ 24.447009][ T297] page_owner tracks the page as allocated [ 24.452752][ 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 1, ts 2079281242, free_ts 0 [ 24.470614][ T297] prep_new_page+0x176/0x190 [ 24.475200][ T297] get_page_from_freelist+0x225f/0x23f0 [ 24.480992][ T297] __alloc_pages_nodemask+0x29a/0x640 [ 24.486711][ T297] new_slab+0x84/0x3f0 [ 24.490761][ T297] ___slab_alloc+0x2f8/0x4c0 [ 24.495449][ T297] __slab_alloc+0x63/0xa0 [ 24.500023][ T297] kmem_cache_alloc_trace+0x1a8/0x2e0 [ 24.505491][ T297] blkg_alloc+0x6d/0x570 [ 24.509903][ T297] blkcg_init_queue+0x2d/0x330 [ 24.514825][ T297] blk_alloc_queue+0x444/0x5f0 [ 24.519573][ T297] blk_mq_init_queue+0x37/0xd0 [ 24.524319][ T297] scsi_mq_alloc_queue+0x42/0x140 [ 24.529339][ T297] scsi_alloc_sdev+0x611/0x920 [ 24.534087][ T297] scsi_probe_and_add_lun+0x17d/0x3370 [ 24.539618][ T297] __scsi_scan_target+0x1d2/0xbf0 [ 24.544711][ T297] scsi_scan_host_selected+0x34e/0x600 [ 24.550159][ T297] page_owner free stack trace missing [ 24.555955][ T297] [ 24.558374][ T297] Memory state around the buggy address: [ 24.563995][ T297] ffff88810adf0700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 24.572044][ T297] ffff88810adf0780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 24.580106][ T297] >ffff88810adf0800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 24.588378][ T297] ^ [ 24.592447][ T297] ffff88810adf0880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 24.600617][ T297] ffff88810adf0900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 24.608956][ T297] ================================================================== [ 24.617107][ T297] Disabling lock debugging due to kernel taint [ 24.626715][ T297] ------------[ cut here ]------------ [ 24.632267][ T297] WARNING: CPU: 1 PID: 297 at net/l2tp/l2tp_ppp.c:156 pppol2tp_sock_to_session+0x167/0x1b0 [ 24.636395][ T24] audit: type=1400 audit(1785382021.010:68): 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 [ 24.642378][ T297] Modules linked in: [ 24.668161][ T297] CPU: 1 PID: 297 Comm: syz-executor197 Tainted: G B syzkaller #0 [ 24.677417][ T297] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026 [ 24.687250][ T24] audit: type=1400 audit(1785382021.010:69): 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 [ 24.687571][ T297] RIP: 0010:pppol2tp_sock_to_session+0x167/0x1b0 [ 24.709055][ T24] audit: type=1400 audit(1785382021.010:70): 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 [ 24.715248][ T297] Code: 5d c3 e8 dc df 35 fd be 02 00 00 00 eb 0a e8 d0 df 35 fd be 01 00 00 00 4c 89 f7 e8 43 55 0f fe e9 0f ff ff ff e8 b9 df 35 fd <0f> 0b 48 89 df e8 ef 00 00 00 eb bd e8 a8 df 35 fd 4c 89 f7 be 03 [ 24.736817][ T24] audit: type=1400 audit(1785382021.010:71): 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 [ 24.756695][ T297] RSP: 0018:ffffc90000b27c00 EFLAGS: 00010293 [ 24.777174][ T24] audit: type=1400 audit(1785382021.010:72): 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 [ 24.783441][ T297] RAX: ffffffff842ec3a7 RBX: ffff88810b1e3800 RCX: ffff88810af662c0 [ 24.803789][ T24] audit: type=1400 audit(1785382021.010:73): 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 [ 24.811803][ T297] RDX: 0000000000000000 RSI: 000000000b1b2000 RDI: 000000000c04eb7d [ 24.842497][ T297] RBP: ffffc90000b27c20 R08: 0000000000000003 R09: 0000000000000004 [ 24.851327][ T297] R10: dffffc0000000000 R11: fffffbfff0dcf648 R12: dffffc0000000000 [ 24.859506][ T297] R13: dffffc0000000000 R14: 000000000b1b2000 R15: ffff88810adf0800 [ 24.867553][ T297] FS: 0000000000000000(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 [ 24.876876][ T297] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 24.883577][ T297] CR2: 00007fcd9852417c CR3: 000000010d708000 CR4: 00000000003506a0 [ 24.891558][ T297] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 24.899573][ T297] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 24.907671][ T297] Call Trace: [ 24.911045][ T297] pppol2tp_release+0x150/0x2b0 [ 24.915966][ T297] sock_close+0xb8/0x200 [ 24.920219][ T297] ? sock_mmap+0xa0/0xa0 [ 24.924659][ T297] __fput+0x2dc/0x730 [ 24.928658][ T297] ? _raw_spin_lock+0x94/0xf0 [ 24.933350][ T297] ____fput+0x15/0x20 [ 24.937331][ T297] task_work_run+0x127/0x190 [ 24.941918][ T297] do_exit+0xa7c/0x24e0 [ 24.946097][ T297] ? ptrace_notify+0x1ea/0x270 [ 24.950877][ T297] ? put_task_struct+0x90/0x90 [ 24.955657][ T297] ? do_notify_parent+0x810/0x810 [ 24.960679][ T297] do_group_exit+0x149/0x310 [ 24.965300][ T297] __x64_sys_exit_group+0x3f/0x40 [ 24.970338][ T297] do_syscall_64+0x31/0x40 [ 24.974860][ T297] entry_SYSCALL_64_after_hwframe+0x61/0xcb [ 24.980768][ T297] RIP: 0033:0x7fcd984be305 [ 24.985237][ T297] Code: Unable to access opcode bytes at RIP 0x7fcd984be2db. [ 24.992615][ T297] RSP: 002b:00007ffeaefb1c18 EFLAGS: 00000206 ORIG_RAX: 00000000000000e7 [ 25.001264][ T297] RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 00007fcd984be305 [ 25.009280][ T297] RDX: 00000000000000e7 RSI: ffffffffffffffd8 RDI: 0000000000000000 [ 25.017317][ T297] RBP: 0000000000000000 R08: 0000000000000000 R09: 00007ffeaefb1da8 +++ exited with 0 +++ [ 25.025335][ T297] R10: 000000000000000