ci2-android-5-10/strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ci2-android-5-10/syz-executor2308093693 <...> syzkaller syzkaller login: [ 15.625079][ T24] kauditd_printk_skb: 31 callbacks suppressed [ 15.625092][ T24] audit: type=1400 audit(1787934093.550:59): avc: denied { transition } for pid=217 comm="sshd-session" path="/bin/sh" dev="sda1" ino=90 scontext=system_u:system_r:sshd_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1 [ 15.636288][ T24] audit: type=1400 audit(1787934093.550:60): avc: denied { noatsecure } for pid=217 comm="sshd-session" scontext=system_u:system_r:sshd_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1 [ 15.644006][ T24] audit: type=1400 audit(1787934093.560:61): avc: denied { write } for pid=217 comm="sh" path="pipe:[13707]" dev="pipefs" ino=13707 scontext=root:sysadm_r:sysadm_t tcontext=system_u:system_r:sshd_t tclass=fifo_file permissive=1 [ 15.664689][ T24] audit: type=1400 audit(1787934093.560:62): avc: denied { rlimitinh } for pid=217 comm="sh" scontext=system_u:system_r:sshd_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1 [ 15.683641][ T24] audit: type=1400 audit(1787934093.560:63): avc: denied { siginh } for pid=217 comm="sh" scontext=system_u:system_r:sshd_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1 Warning: Permanently added '10.128.0.225' (ED25519) to the list of known hosts. execve("ci2-android-5-10/syz-executor2308093693", ["ci2-android-5-10/syz-executor2308093693"], 0x7ffec6b757d0 /* 10 vars */) = 0 brk(NULL) = 0x55556731e000 brk(0x55556731ed40) = 0x55556731ed40 arch_prctl(ARCH_SET_FS, 0x55556731e3c0) = 0 set_tid_address(0x55556731e690) = 297 set_robust_list(0x55556731e6a0, 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-executor2308093693", 4096) = 45 getrandom("\x47\x63\x7c\x92\x70\x20\xc3\x78", 8, GRND_NONBLOCK) = 8 brk(NULL) = 0x55556731ed40 brk(0x55556733fd40) = 0x55556733fd40 brk(0x555567340000) = 0x555567340000 mprotect(0x7fd1d7b91000, 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_INET, SOCK_DGRAM, IPPROTO_IP) = 3 socket(AF_PPPOX, SOCK_STREAM, 1) = 4 connect(4, {sa_family=AF_PPPOX, sa_data="\x01\x00\x00\x00\x00\x00\x00\x00\x03\x00\x00\x00\x02\x00\x00\x00\xe0\x00\x00\x01\x00\x00\x00\x00\x00\x00\x00\x00\x0a\x00\x00\x00\xfd\xff\x00\x00"}, 38) = 0 ioctl(4, _IOC(_IOC_READ|_IOC_WRITE, 0x58, 0x40, 0x28), 0) = -1 ENOTTY (Inappropriate ioctl for device) exit_group(0) = ? [ 25.785076][ T24] audit: type=1400 audit(1787934103.710:64): avc: denied { execmem } for pid=297 comm="syz-executor230" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1 [ 25.805254][ T24] audit: type=1400 audit(1787934103.710:65): avc: denied { create } for pid=297 comm="syz-executor230" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=pppox_socket permissive=1 [ 25.807972][ T297] ================================================================== [ 25.826412][ T24] audit: type=1400 audit(1787934103.710:66): avc: denied { connect } for pid=297 comm="syz-executor230" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=pppox_socket permissive=1 [ 25.833102][ T297] BUG: KASAN: use-after-free in mutex_lock+0x85/0xf0 [ 25.833136][ T297] Write of size 8 at addr ffff88811b9f3d50 by task syz-executor230/297 [ 25.867810][ T297] [ 25.870169][ T297] CPU: 1 PID: 297 Comm: syz-executor230 Not tainted syzkaller #0 [ 25.877905][ T297] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 [ 25.887967][ T297] Call Trace: [ 25.891267][ T297] __dump_stack+0x21/0x24 [ 25.895611][ T297] dump_stack_lvl+0x1a7/0x208 [ 25.900308][ T297] ? show_regs_print_info+0x18/0x18 [ 25.905516][ T297] ? thaw_kernel_threads+0x220/0x220 [ 25.910823][ T297] print_address_description+0x7f/0x2c0 [ 25.916372][ T297] ? mutex_lock+0x85/0xf0 [ 25.920707][ T297] kasan_report+0x100/0x140 [ 25.925217][ T297] ? mutex_lock+0x85/0xf0 [ 25.929549][ T297] kasan_check_range+0x249/0x2a0 [ 25.934521][ T297] __kasan_check_write+0x14/0x20 [ 25.939488][ T297] mutex_lock+0x85/0xf0 [ 25.943649][ T297] ? mutex_trylock+0xb0/0xb0 [ 25.948247][ T297] ? l2tp_session_put+0xb2/0x1a0 [ 25.953189][ T297] ? l2tp_session_delete+0x3a9/0x4a0 [ 25.958481][ T297] pppol2tp_release+0x178/0x2b0 [ 25.963337][ T297] sock_close+0xb8/0x200 [ 25.967586][ T297] ? sock_mmap+0xa0/0xa0 [ 25.971834][ T297] __fput+0x2dc/0x730 [ 25.975824][ T297] ? _raw_spin_lock+0x94/0xf0 [ 25.980509][ T297] ____fput+0x15/0x20 [ 25.984507][ T297] task_work_run+0x127/0x190 [ 25.989117][ T297] do_exit+0xa7c/0x24e0 [ 25.993314][ T297] ? ptrace_notify+0x1ea/0x270 [ 25.998081][ T297] ? put_task_struct+0x90/0x90 [ 26.002849][ T297] ? do_notify_parent+0x810/0x810 [ 26.007907][ T297] do_group_exit+0x149/0x310 [ 26.012502][ T297] __x64_sys_exit_group+0x3f/0x40 [ 26.017527][ T297] do_syscall_64+0x31/0x40 [ 26.021996][ T297] entry_SYSCALL_64_after_hwframe+0x61/0xcb [ 26.028042][ T297] RIP: 0033:0x7fd1d7b00305 [ 26.032472][ T297] Code: Unable to access opcode bytes at RIP 0x7fd1d7b002db. [ 26.039846][ T297] RSP: 002b:00007ffd0cd5e448 EFLAGS: 00000202 ORIG_RAX: 00000000000000e7 [ 26.048272][ T297] RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 00007fd1d7b00305 [ 26.056258][ T297] RDX: 00000000000000e7 RSI: ffffffffffffffd8 RDI: 0000000000000000 [ 26.064246][ T297] RBP: 0000000000000000 R08: 0000000000000000 R09: 00007ffd0cd5e5d8 [ 26.072229][ T297] R10: 00000000fffffffd R11: 0000000000000202 R12: 0000000000000000 [ 26.080218][ T297] R13: 00007fd1d7b96110 R14: 00007fd1d7b983a8 R15: 00007fd1d7b983c0 [ 26.088198][ T297] [ 26.090543][ T297] Allocated by task 297: [ 26.094813][ T297] __kasan_kmalloc+0xd4/0x100 [ 26.099504][ T297] __kmalloc+0x19f/0x330 [ 26.103791][ T297] l2tp_session_create+0x39/0xb60 [ 26.108831][ T297] pppol2tp_connect+0xbf5/0x1640 [ 26.113797][ T297] __sys_connect+0x3ce/0x450 [ 26.118393][ T297] __x64_sys_connect+0x7a/0x90 [ 26.123161][ T297] do_syscall_64+0x31/0x40 [ 26.127581][ T297] entry_SYSCALL_64_after_hwframe+0x61/0xcb [ 26.133466][ T297] [ 26.135809][ T297] Freed by task 297: [ 26.139704][ T297] kasan_set_track+0x4a/0x70 [ 26.144297][ T297] kasan_set_free_info+0x23/0x40 [ 26.149240][ T297] ____kasan_slab_free+0x125/0x160 [ 26.154356][ T297] __kasan_slab_free+0x11/0x20 [ 26.159146][ T297] slab_free_freelist_hook+0xc5/0x190 [ 26.164518][ T297] kfree+0xc0/0x270 [ 26.168329][ T297] l2tp_session_put+0xb2/0x1a0 [ 26.173099][ T297] l2tp_session_delete+0x3a9/0x4a0 [ 26.178226][ T297] pppol2tp_release+0x169/0x2b0 [ 26.183078][ T297] sock_close+0xb8/0x200 [ 26.187328][ T297] __fput+0x2dc/0x730 [ 26.191312][ T297] ____fput+0x15/0x20 [ 26.195307][ T297] task_work_run+0x127/0x190 [ 26.199923][ T297] do_exit+0xa7c/0x24e0 [ 26.204083][ T297] do_group_exit+0x149/0x310 [ 26.208677][ T297] __x64_sys_exit_group+0x3f/0x40 [ 26.213702][ T297] do_syscall_64+0x31/0x40 [ 26.218122][ T297] entry_SYSCALL_64_after_hwframe+0x61/0xcb [ 26.224010][ T297] [ 26.226455][ T297] The buggy address belongs to the object at ffff88811b9f3c00 [ 26.226455][ T297] which belongs to the cache kmalloc-512 of size 512 [ 26.240509][ T297] The buggy address is located 336 bytes inside of [ 26.240509][ T297] 512-byte region [ffff88811b9f3c00, ffff88811b9f3e00) [ 26.253780][ T297] The buggy address belongs to the page: [ 26.259461][ T297] page:ffffea00046e7c00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11b9f0 [ 26.269696][ T297] head:ffffea00046e7c00 order:2 compound_mapcount:0 compound_pincount:0 [ 26.278020][ T297] flags: 0x4000000000010200(slab|head) [ 26.283486][ T297] raw: 4000000000010200 dead000000000100 dead000000000122 ffff888100043080 [ 26.292080][ T297] raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000 [ 26.300680][ T297] page dumped because: kasan: bad access detected [ 26.307123][ T297] page_owner tracks the page as allocated [ 26.312854][ 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 293, ts 25709359745, free_ts 20082108683 [ 26.331859][ T297] prep_new_page+0x176/0x190 [ 26.336448][ T297] get_page_from_freelist+0x225f/0x23f0 [ 26.341997][ T297] __alloc_pages_nodemask+0x29a/0x640 [ 26.347377][ T297] new_slab+0x84/0x3f0 [ 26.351447][ T297] ___slab_alloc+0x2f8/0x4c0 [ 26.356060][ T297] __slab_alloc+0x63/0xa0 [ 26.360392][ T297] __kmalloc_track_caller+0x1e4/0x310 [ 26.365762][ T297] __alloc_skb+0xdc/0x520 [ 26.370113][ T297] alloc_skb_with_frags+0xa3/0x560 [ 26.375224][ T297] sock_alloc_send_pskb+0x87f/0x9a0 [ 26.380435][ T297] unix_stream_sendmsg+0x4c9/0xbe0 [ 26.385561][ T297] sock_write_iter+0x2a6/0x3a0 [ 26.390365][ T297] vfs_write+0x770/0xd70 [ 26.394628][ T297] ksys_write+0x14a/0x260 [ 26.398970][ T297] __x64_sys_write+0x7b/0x90 [ 26.403581][ T297] do_syscall_64+0x31/0x40 [ 26.407999][ T297] page last free stack trace: [ 26.412690][ T297] free_unref_page_prepare+0x2b7/0x2d0 [ 26.418165][ T297] free_unref_page+0x7f/0x190 [ 26.422853][ T297] __put_page+0xae/0xe0 [ 26.427016][ T297] anon_pipe_buf_release+0x165/0x1f0 [ 26.432393][ T297] pipe_read+0x563/0x1050 [ 26.436744][ T297] vfs_read+0x62a/0xa50 [ 26.440922][ T297] ksys_read+0x14a/0x260 [ 26.445174][ T297] __x64_sys_read+0x7b/0x90 [ 26.449686][ T297] do_syscall_64+0x31/0x40 [ 26.454115][ T297] entry_SYSCALL_64_after_hwframe+0x61/0xcb [ 26.460011][ T297] [ 26.462344][ T297] Memory state around the buggy address: [ 26.467982][ T297] ffff88811b9f3c00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 26.476047][ T297] ffff88811b9f3c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 26.484118][ T297] >ffff88811b9f3d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 26.492177][ T297] ^ [ 26.498853][ T297] ffff88811b9f3d80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 26.506912][ T297] ffff88811b9f3e00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 26.515085][ T297] ================================================================== [ 26.523155][ T297] Disabling lock debugging due to kernel taint +++ exited with 0 +++ [ 26.529602][ T24] audit: type=1400 audit(1787934103.730:67): avc: denied { ioctl } for pid=297