ci2-android-5-10/strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ci2-android-5-10/syz-executor3304848040 <...> Warning: Permanently added '10.128.0.119' (ED25519) to the list of known hosts. execve("ci2-android-5-10/syz-executor3304848040", ["ci2-android-5-10/syz-executor3304848040"], 0x7fff068d18b0 /* 10 vars */) = 0 brk(NULL) = 0x5555648cf000 brk(0x5555648cfd40) = 0x5555648cfd40 arch_prctl(ARCH_SET_FS, 0x5555648cf3c0) = 0 set_tid_address(0x5555648cf690) = 297 set_robust_list(0x5555648cf6a0, 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-executor3304848040", 4096) = 45 getrandom("\x1e\xff\x4e\xd2\x2b\x99\x90\x42", 8, GRND_NONBLOCK) = 8 brk(NULL) = 0x5555648cfd40 brk(0x5555648f0d40) = 0x5555648f0d40 brk(0x5555648f1000) = 0x5555648f1000 mprotect(0x7f889404e000, 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\x03\x00\x00\x00\x04\x00\x00\x00\x02\x00\x00\x00\xe0\x00\x00\x02\x00\x00\x00\x00\x00\x00\x00\x00\x03\x00\x00\x20\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"}, 46) = 0 ioctl(3, _IOC(_IOC_READ|_IOC_WRITE, 0x58, 0x3f, 0x40), 0) = -1 ENOTTY (Inappropriate ioctl for device) exit_group(0) = ? [ 20.155381][ T24] audit: type=1400 audit(1786221587.780:64): avc: denied { execmem } for pid=297 comm="syz-executor330" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1 [ 20.165845][ T24] audit: type=1400 audit(1786221587.790:65): avc: denied { create } for pid=297 comm="syz-executor330" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=pppox_socket permissive=1 [ 20.179006][ T297] ================================================================== [ 20.179205][ T24] audit: type=1400 audit(1786221587.790:66): avc: denied { connect } for pid=297 comm="syz-executor330" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=pppox_socket permissive=1 [ 20.194159][ T297] BUG: KASAN: use-after-free in pppol2tp_sock_to_session+0x1a0/0x1b0 [ 20.194170][ T297] Read of size 4 at addr ffff88810aae0400 by task syz-executor330/297 [ 20.194172][ T297] [ 20.194194][ T297] CPU: 0 PID: 297 Comm: syz-executor330 Not tainted syzkaller #0 [ 20.230885][ T24] audit: type=1400 audit(1786221587.790:67): avc: denied { ioctl } for pid=297 comm="syz-executor330" path="socket:[13167]" dev="sockfs" ino=13167 ioctlcmd=0x583f scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=pppox_socket permissive=1 [ 20.242219][ T297] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 [ 20.242233][ T297] Call Trace: [ 20.242259][ T297] __dump_stack+0x21/0x24 [ 20.242268][ T297] dump_stack_lvl+0x1a7/0x208 [ 20.242287][ T297] ? show_regs_print_info+0x18/0x18 [ 20.348816][ T297] ? thaw_kernel_threads+0x220/0x220 [ 20.358719][ T297] ? __local_bh_enable_ip+0x53/0x80 [ 20.366916][ T297] print_address_description+0x7f/0x2c0 [ 20.375811][ T297] ? pppol2tp_sock_to_session+0x1a0/0x1b0 [ 20.385322][ T297] kasan_report+0x100/0x140 [ 20.391113][ T297] ? pppol2tp_sock_to_session+0x1a0/0x1b0 [ 20.398514][ T297] __asan_report_load4_noabort+0x14/0x20 [ 20.407693][ T297] pppol2tp_sock_to_session+0x1a0/0x1b0 [ 20.414790][ T297] pppol2tp_release+0x150/0x2b0 [ 20.422780][ T297] sock_close+0xb8/0x200 [ 20.428032][ T297] ? sock_mmap+0xa0/0xa0 [ 20.434354][ T297] __fput+0x2dc/0x730 [ 20.439742][ T297] ? _raw_spin_lock+0x94/0xf0 [ 20.445559][ T297] ____fput+0x15/0x20 [ 20.451174][ T297] task_work_run+0x127/0x190 [ 20.457076][ T297] do_exit+0xa7c/0x24e0 [ 20.462483][ T297] ? ptrace_notify+0x1ea/0x270 [ 20.468683][ T297] ? put_task_struct+0x90/0x90 [ 20.473619][ T297] ? do_notify_parent+0x810/0x810 [ 20.478824][ T297] do_group_exit+0x149/0x310 [ 20.483589][ T297] __x64_sys_exit_group+0x3f/0x40 [ 20.489144][ T297] do_syscall_64+0x31/0x40 [ 20.495029][ T297] entry_SYSCALL_64_after_hwframe+0x61/0xcb [ 20.501112][ T297] RIP: 0033:0x7f8893fbd305 [ 20.505944][ T297] Code: Unable to access opcode bytes at RIP 0x7f8893fbd2db. [ 20.514008][ T297] RSP: 002b:00007ffceb2396a8 EFLAGS: 00000202 ORIG_RAX: 00000000000000e7 [ 20.523094][ T297] RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 00007f8893fbd305 [ 20.531427][ T297] RDX: 00000000000000e7 RSI: ffffffffffffffd8 RDI: 0000000000000000 [ 20.540133][ T297] RBP: 0000000000000000 R08: 0000000000000000 R09: 00007ffceb239838 [ 20.549457][ T297] R10: 00007ffceb239838 R11: 0000000000000202 R12: 0000000000000000 [ 20.558761][ T297] R13: 00007f8894053110 R14: 00007f88940553a8 R15: 00007f88940553c0 [ 20.567481][ T297] [ 20.569817][ T297] Allocated by task 297: [ 20.574063][ T297] __kasan_kmalloc+0xd4/0x100 [ 20.579240][ T297] __kmalloc+0x19f/0x330 [ 20.583486][ T297] l2tp_session_create+0x39/0xb60 [ 20.588612][ T297] pppol2tp_connect+0xbf5/0x1640 [ 20.593634][ T297] __sys_connect+0x3ce/0x450 [ 20.598521][ T297] __x64_sys_connect+0x7a/0x90 [ 20.603412][ T297] do_syscall_64+0x31/0x40 [ 20.608088][ T297] entry_SYSCALL_64_after_hwframe+0x61/0xcb [ 20.614752][ T297] [ 20.617073][ T297] Freed by task 7: [ 20.620793][ T297] kasan_set_track+0x4a/0x70 [ 20.626288][ T297] kasan_set_free_info+0x23/0x40 [ 20.631965][ T297] ____kasan_slab_free+0x125/0x160 [ 20.637665][ T297] __kasan_slab_free+0x11/0x20 [ 20.644489][ T297] slab_free_freelist_hook+0xc5/0x190 [ 20.650261][ T297] kfree+0xc0/0x270 [ 20.654615][ T297] l2tp_session_put+0xb2/0x1a0 [ 20.659994][ T297] l2tp_session_delete+0x3a9/0x4a0 [ 20.667472][ T297] l2tp_tunnel_del_work+0x180/0x3d0 [ 20.673078][ T297] process_one_work+0x6fd/0xbc0 [ 20.678187][ T297] worker_thread+0xa8e/0x13c0 [ 20.684787][ T297] kthread+0x324/0x3b0 [ 20.689050][ T297] ret_from_fork+0x1f/0x30 [ 20.694210][ T297] [ 20.696617][ T297] The buggy address belongs to the object at ffff88810aae0400 [ 20.696617][ T297] which belongs to the cache kmalloc-512 of size 512 [ 20.713619][ T297] The buggy address is located 0 bytes inside of [ 20.713619][ T297] 512-byte region [ffff88810aae0400, ffff88810aae0600) [ 20.727845][ T297] The buggy address belongs to the page: [ 20.734118][ T297] page:ffffea00042ab800 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10aae0 [ 20.748090][ T297] head:ffffea00042ab800 order:2 compound_mapcount:0 compound_pincount:0 [ 20.759666][ T297] flags: 0x4000000000010200(slab|head) [ 20.766350][ T297] raw: 4000000000010200 dead000000000100 dead000000000122 ffff888100043080 [ 20.775407][ T297] raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000 [ 20.784080][ T297] page dumped because: kasan: bad access detected [ 20.790628][ T297] page_owner tracks the page as allocated [ 20.797093][ 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 292, ts 20015496638, free_ts 16618026841 [ 20.823077][ T297] prep_new_page+0x176/0x190 [ 20.830938][ T297] get_page_from_freelist+0x225f/0x23f0 [ 20.839019][ T297] __alloc_pages_nodemask+0x29a/0x640 [ 20.844774][ T297] new_slab+0x84/0x3f0 [ 20.849511][ T297] ___slab_alloc+0x2f8/0x4c0 [ 20.854490][ T297] __slab_alloc+0x63/0xa0 [ 20.859032][ T297] __kmalloc_track_caller+0x1e4/0x310 [ 20.865119][ T297] __alloc_skb+0xdc/0x520 [ 20.869613][ T297] sock_wmalloc+0xb5/0x130 [ 20.874120][ T297] unix_stream_connect+0x2f8/0xf90 [ 20.879745][ T297] __sys_connect+0x3ce/0x450 [ 20.884521][ T297] __x64_sys_connect+0x7a/0x90 [ 20.890312][ T297] do_syscall_64+0x31/0x40 [ 20.895229][ T297] entry_SYSCALL_64_after_hwframe+0x61/0xcb [ 20.902314][ T297] page last free stack trace: [ 20.907996][ T297] __free_pages_ok+0x80b/0x830 [ 20.913563][ T297] __free_pages+0xd8/0x390 [ 20.919073][ T297] __free_slab+0xcf/0x190 [ 20.924747][ T297] unfreeze_partials+0x150/0x180 [ 20.934894][ T297] put_cpu_partial+0xc1/0x180 [ 20.941346][ T297] __slab_free+0x2c9/0x3a0 [ 20.945780][ T297] ___cache_free+0x10e/0x130 [ 20.950611][ T297] qlink_free+0x50/0x90 [ 20.954973][ T297] qlist_free_all+0x5f/0xb0 [ 20.959463][ T297] kasan_quarantine_reduce+0x14a/0x160 [ 20.964981][ T297] __kasan_slab_alloc+0x2f/0xe0 [ 20.970639][ T297] slab_post_alloc_hook+0x5d/0x2f0 [ 20.975961][ T297] kmem_cache_alloc+0x15a/0x2d0 [ 20.980987][ T297] vm_area_alloc+0x24/0x160 [ 20.986769][ T297] mmap_region+0xa5e/0x19c0 [ 20.993679][ T297] do_mmap+0x85f/0xf50 [ 20.998262][ T297] [ 21.001120][ T297] Memory state around the buggy address: [ 21.013192][ T297] ffff88810aae0300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 21.024985][ T297] ffff88810aae0380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 21.034957][ T297] >ffff88810aae0400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 21.043900][ T297] ^ [ 21.048712][ T297] ffff88810aae0480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 21.059746][ T297] ffff88810aae0500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 21.071236][ T297] ================================================================== [ 21.080465][ T297] Disabling lock debugging due to kernel taint [ 21.089867][ T297] ------------[ cut here ]------------ [ 21.094582][ T24] audit: type=1400 audit(1786221588.720:68): 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 [ 21.096294][ T297] WARNING: CPU: 0 PID: 297 at net/l2tp/l2tp_ppp.c:156 pppol2tp_sock_to_session+0x167/0x1b0 [ 21.123793][ T24] audit: type=1400 audit(1786221588.720:69): 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 [ 21.135732][ T297] Modules linked in: [ 21.159475][ T24] audit: type=1400 audit(1786221588.720:70): 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 [ 21.164589][ T297] CPU: 0 PID: 297 Comm: syz-executor330 Tainted: G B syzkaller #0 [ 21.187613][ T24] audit: type=1400 audit(1786221588.720:71): 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 [ 21.197086][ T297] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 [ 21.218217][ T24] audit: type=1400 audit(1786221588.720:72): 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 [ 21.230307][ T297] RIP: 0010:pppol2tp_sock_to_session+0x167/0x1b0 [ 21.252436][ T24] audit: type=1400 audit(1786221588.720:73): 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 [ 21.261291][ T297] Code: 5d c3 e8 8c dc 35 fd be 02 00 00 00 eb 0a e8 80 dc 35 fd be 01 00 00 00 4c 89 f7 e8 f3 32 0f fe e9 0f ff ff ff e8 69 dc 35 fd <0f> 0b 48 89 df e8 ef 00 00 00 eb bd e8 58 dc 35 fd 4c 89 f7 be 03 [ 21.310742][ T297] RSP: 0018:ffffc90000b47c00 EFLAGS: 00010293 [ 21.317728][ T297] RAX: ffffffff842ec977 RBX: ffff88810aaee000 RCX: ffff88810ac50000 [ 21.327700][ T297] RDX: 0000000000000000 RSI: 000000001ceca020 RDI: 000000000c04eb7d [ 21.336787][ T297] RBP: ffffc90000b47c20 R08: 0000000000000003 R09: 0000000000000004 [ 21.345590][ T297] R10: dffffc0000000000 R11: fffffbfff0dcf648 R12: dffffc0000000000 [ 21.359037][ T297] R13: dffffc0000000000 R14: 000000001ceca020 R15: ffff88810aae0400 [ 21.370327][ T297] FS: 0000000000000000(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 [ 21.380710][ T297] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 21.388294][ T297] CR2: 00007f889402317c CR3: 000000010d6df000 CR4: 00000000003506b0 [ 21.398783][ T297] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 21.408318][ T297] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 21.416708][ T297] Call Trace: [ 21.420223][ T297] pppol2tp_release+0x150/0x2b0 [ 21.425341][ T297] sock_close+0xb8/0x200 [ 21.430116][ T297] ? sock_mmap+0xa0/0xa0 [ 21.434511][ T297] __fput+0x2dc/0x730 [ 21.438715][ T297] ? _raw_spin_lock+0x94/0xf0 [ 21.444174][ T297] ____fput+0x15/0x20 [ 21.448488][ T297] task_work_run+0x127/0x190 [ 21.453518][ T297] do_exit+0xa7c/0x24e0 [ 21.457967][ T297] ? ptrace_notify+0x1ea/0x270 [ 21.462970][ T297] ? put_task_struct+0x90/0x90 [ 21.467943][ T297] ? do_notify_parent+0x810/0x810 [ 21.473375][ T297] do_group_exit+0x149/0x310 [ 21.478176][ T297] __x64_sys_exit_group+0x3f/0x40 [ 21.483428][ T297] do_syscall_64+0x31/0x40 [ 21.488791][ T297] entry_SYSCALL_64_after_hwframe+0x61/0xcb [ 21.495012][ T297] RIP: 0033:0x7f8893fbd305 [ 21.499931][ T297] Code: Unable to access opcode bytes at RIP 0x7f8893fbd2db. +++ exited with 0 +++ [ 21.507607][ T297] RSP: 002b:00007ffceb2396a8 EFLAGS: 00000202 ORIG_RAX: 0000000