ci2-android-5-10/strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ci2-android-5-10/syz-executor2863864550 <...> ss permissive=1 [ 16.239814][ T24] audit: type=1400 audit(1789361797.930:63): 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 '10.128.0.118' (ED25519) to the list of known hosts. execve("ci2-android-5-10/syz-executor2863864550", ["ci2-android-5-10/syz-executor2863864550"], 0x7fff109f62b0 /* 10 vars */) = 0 brk(NULL) = 0x55555cfdc000 brk(0x55555cfdcd40) = 0x55555cfdcd40 arch_prctl(ARCH_SET_FS, 0x55555cfdc3c0) = 0 set_tid_address(0x55555cfdc690) = 297 set_robust_list(0x55555cfdc6a0, 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-executor2863864550", 4096) = 45 getrandom("\xb8\x07\x19\xd5\x20\x0a\x5c\xcd", 8, GRND_NONBLOCK) = 8 brk(NULL) = 0x55555cfdcd40 brk(0x55555cffdd40) = 0x55555cffdd40 brk(0x55555cffe000) = 0x55555cffe000 mprotect(0x7fdd3543a000, 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\x04\x00\x00\x00\xfc\xff\x00\x00\x0a\x00\x4e\x22\x00\x00\xff\xff\xff\x02\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01\x00\x00\x00\x00"}, 50) = 0 ioctl(3, BTRFS_IOC_DEV_INFO, NULL) = -1 ENOTTY (Inappropriate ioctl for device) exit_group(0) = ? [ 26.415319][ T24] audit: type=1400 audit(1789361808.140:64): avc: denied { execmem } for pid=297 comm="syz-executor286" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1 [ 26.435371][ T24] audit: type=1400 audit(1789361808.140:65): avc: denied { create } for pid=297 comm="syz-executor286" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=pppox_socket permissive=1 [ 26.455293][ T297] ================================================================== [ 26.456869][ T24] audit: type=1400 audit(1789361808.140:66): avc: denied { connect } for pid=297 comm="syz-executor286" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=pppox_socket permissive=1 [ 26.463415][ T297] BUG: KASAN: use-after-free in mutex_lock+0x85/0xf0 [ 26.463456][ T297] Write of size 8 at addr ffff888100b8bd50 by task syz-executor286/297 [ 26.484190][ T24] audit: type=1400 audit(1789361808.170:67): avc: denied { ioctl } for pid=297 comm="syz-executor286" path="socket:[13977]" dev="sockfs" ino=13977 ioctlcmd=0x941e scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=pppox_socket permissive=1 [ 26.490017][ T297] [ 26.490042][ T297] CPU: 1 PID: 297 Comm: syz-executor286 Not tainted syzkaller #0 [ 26.490048][ T297] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/08/2026 [ 26.490060][ T297] Call Trace: [ 26.546772][ T297] __dump_stack+0x21/0x24 [ 26.551107][ T297] dump_stack_lvl+0x1a7/0x208 [ 26.555798][ T297] ? show_regs_print_info+0x18/0x18 [ 26.561017][ T297] ? thaw_kernel_threads+0x220/0x220 [ 26.566299][ T297] print_address_description+0x7f/0x2c0 [ 26.571840][ T297] ? mutex_lock+0x85/0xf0 [ 26.576162][ T297] kasan_report+0x100/0x140 [ 26.580660][ T297] ? mutex_lock+0x85/0xf0 [ 26.584990][ T297] kasan_check_range+0x249/0x2a0 [ 26.589921][ T297] __kasan_check_write+0x14/0x20 [ 26.594852][ T297] mutex_lock+0x85/0xf0 [ 26.599023][ T297] ? mutex_trylock+0xb0/0xb0 [ 26.603606][ T297] ? l2tp_session_put+0xb2/0x1a0 [ 26.608536][ T297] ? l2tp_session_delete+0x3a9/0x4a0 [ 26.613815][ T297] pppol2tp_release+0x178/0x2b0 [ 26.618694][ T297] sock_close+0xb8/0x200 [ 26.622932][ T297] ? sock_mmap+0xa0/0xa0 [ 26.627185][ T297] __fput+0x2dc/0x730 [ 26.631158][ T297] ? _raw_spin_lock+0x94/0xf0 [ 26.635828][ T297] ____fput+0x15/0x20 [ 26.639805][ T297] task_work_run+0x127/0x190 [ 26.644388][ T297] do_exit+0xa7c/0x24e0 [ 26.648539][ T297] ? ptrace_notify+0x1ea/0x270 [ 26.653291][ T297] ? put_task_struct+0x90/0x90 [ 26.658046][ T297] ? do_notify_parent+0x810/0x810 [ 26.663061][ T297] do_group_exit+0x149/0x310 [ 26.667701][ T297] __x64_sys_exit_group+0x3f/0x40 [ 26.672719][ T297] do_syscall_64+0x31/0x40 [ 26.677128][ T297] entry_SYSCALL_64_after_hwframe+0x61/0xcb [ 26.684737][ T297] RIP: 0033:0x7fdd353a9345 [ 26.689151][ T297] Code: Unable to access opcode bytes at RIP 0x7fdd353a931b. [ 26.696522][ T297] RSP: 002b:00007ffd389e20f8 EFLAGS: 00000202 ORIG_RAX: 00000000000000e7 [ 26.704937][ T297] RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 00007fdd353a9345 [ 26.712911][ T297] RDX: 00000000000000e7 RSI: ffffffffffffffd8 RDI: 0000000000000000 [ 26.720897][ T297] RBP: 0000000000000000 R08: 0000000000000000 R09: 00007ffd389e2288 [ 26.728880][ T297] R10: 000000000000000a R11: 0000000000000202 R12: 0000000000000000 [ 26.736865][ T297] R13: 00007fdd3543f110 R14: 00007fdd354413a8 R15: 00007fdd354413c0 [ 26.744842][ T297] [ 26.747183][ T297] Allocated by task 297: [ 26.751447][ T297] __kasan_kmalloc+0xd4/0x100 [ 26.756133][ T297] __kmalloc+0x19f/0x330 [ 26.760378][ T297] l2tp_session_create+0x39/0xb60 [ 26.765404][ T297] pppol2tp_connect+0xbf5/0x1640 [ 26.770349][ T297] __sys_connect+0x3ce/0x450 [ 26.774940][ T297] __x64_sys_connect+0x7a/0x90 [ 26.779733][ T297] do_syscall_64+0x31/0x40 [ 26.784163][ T297] entry_SYSCALL_64_after_hwframe+0x61/0xcb [ 26.790064][ T297] [ 26.792401][ T297] Freed by task 297: [ 26.796303][ T297] kasan_set_track+0x4a/0x70 [ 26.800923][ T297] kasan_set_free_info+0x23/0x40 [ 26.805868][ T297] ____kasan_slab_free+0x125/0x160 [ 26.810981][ T297] __kasan_slab_free+0x11/0x20 [ 26.815748][ T297] slab_free_freelist_hook+0xc5/0x190 [ 26.821119][ T297] kfree+0xc0/0x270 [ 26.824934][ T297] l2tp_session_put+0xb2/0x1a0 [ 26.829716][ T297] l2tp_session_delete+0x3a9/0x4a0 [ 26.834832][ T297] pppol2tp_release+0x169/0x2b0 [ 26.839691][ T297] sock_close+0xb8/0x200 [ 26.843938][ T297] __fput+0x2dc/0x730 [ 26.847920][ T297] ____fput+0x15/0x20 [ 26.851902][ T297] task_work_run+0x127/0x190 [ 26.856494][ T297] do_exit+0xa7c/0x24e0 [ 26.860653][ T297] do_group_exit+0x149/0x310 [ 26.865283][ T297] __x64_sys_exit_group+0x3f/0x40 [ 26.870326][ T297] do_syscall_64+0x31/0x40 [ 26.874751][ T297] entry_SYSCALL_64_after_hwframe+0x61/0xcb [ 26.880650][ T297] [ 26.882995][ T297] The buggy address belongs to the object at ffff888100b8bc00 [ 26.882995][ T297] which belongs to the cache kmalloc-512 of size 512 [ 26.897058][ T297] The buggy address is located 336 bytes inside of [ 26.897058][ T297] 512-byte region [ffff888100b8bc00, ffff888100b8be00) [ 26.910333][ T297] The buggy address belongs to the page: [ 26.916014][ T297] page:ffffea000402e200 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x100b88 [ 26.926253][ T297] head:ffffea000402e200 order:2 compound_mapcount:0 compound_pincount:0 [ 26.934599][ T297] flags: 0x4000000000010200(slab|head) [ 26.940074][ T297] raw: 4000000000010200 dead000000000100 dead000000000122 ffff888100043080 [ 26.948672][ T297] raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000 [ 26.957258][ T297] page dumped because: kasan: bad access detected [ 26.963680][ T297] page_owner tracks the page as allocated [ 26.969437][ 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 26338618508, free_ts 20945675699 [ 26.988468][ T297] prep_new_page+0x176/0x190 [ 26.993063][ T297] get_page_from_freelist+0x225f/0x23f0 [ 26.998612][ T297] __alloc_pages_nodemask+0x29a/0x640 [ 27.003995][ T297] new_slab+0x84/0x3f0 [ 27.008075][ T297] ___slab_alloc+0x2f8/0x4c0 [ 27.012679][ T297] __slab_alloc+0x63/0xa0 [ 27.017019][ T297] __kmalloc_track_caller+0x1e4/0x310 [ 27.022417][ T297] __alloc_skb+0xdc/0x520 [ 27.026758][ T297] alloc_skb_with_frags+0xa3/0x560 [ 27.031879][ T297] sock_alloc_send_pskb+0x87f/0x9a0 [ 27.037092][ T297] unix_stream_sendmsg+0x4c9/0xbe0 [ 27.042211][ T297] sock_write_iter+0x2a6/0x3a0 [ 27.046980][ T297] vfs_write+0x770/0xd70 [ 27.051225][ T297] ksys_write+0x14a/0x260 [ 27.055563][ T297] __x64_sys_write+0x7b/0x90 [ 27.060167][ T297] do_syscall_64+0x31/0x40 [ 27.064584][ T297] page last free stack trace: [ 27.069272][ T297] free_unref_page_prepare+0x2b7/0x2d0 [ 27.074738][ T297] free_unref_page+0x7f/0x190 [ 27.079443][ T297] __put_page+0xae/0xe0 [ 27.083604][ T297] anon_pipe_buf_release+0x165/0x1f0 [ 27.088896][ T297] pipe_read+0x563/0x1050 [ 27.093229][ T297] vfs_read+0x62a/0xa50 [ 27.097416][ T297] ksys_read+0x14a/0x260 [ 27.101757][ T297] __x64_sys_read+0x7b/0x90 [ 27.106264][ T297] do_syscall_64+0x31/0x40 [ 27.110689][ T297] entry_SYSCALL_64_after_hwframe+0x61/0xcb [ 27.116582][ T297] [ 27.118916][ T297] Memory state around the buggy address: [ 27.124553][ T297] ffff888100b8bc00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 27.132623][ T297] ffff888100b8bc80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 27.140818][ T297] >ffff888100b8bd00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 27.148885][ T297] ^ [ 27.155579][ T297] ffff888100b8bd80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb +++ exited with 0 +++ [ 27.163651][ T297] ffff888100b8be00: fc fc fc fc fc fc fc