ci2-android-5-10/strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ci2-android-5-10/syz-executor1841840460 <...> Warning: Permanently added '10.128.0.249' (ED25519) to the list of known hosts. execve("ci2-android-5-10/syz-executor1841840460", ["ci2-android-5-10/syz-executor1841840460"], 0x7ffe82ad4610 /* 10 vars */) = 0 brk(NULL) = 0x55558ed1f000 brk(0x55558ed1fd40) = 0x55558ed1fd40 arch_prctl(ARCH_SET_FS, 0x55558ed1f3c0) = 0 set_tid_address(0x55558ed1f690) = 297 set_robust_list(0x55558ed1f6a0, 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-executor1841840460", 4096) = 45 getrandom("\x06\xb0\x1d\x88\xbd\xc6\xb0\x0b", 8, GRND_NONBLOCK) = 8 brk(NULL) = 0x55558ed1fd40 brk(0x55558ed40d40) = 0x55558ed40d40 brk(0x55558ed41000) = 0x55558ed41000 mprotect(0x7efd9d822000, 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\x03\x00\x00\x00\x04\x00\x00\x00\x02\x00\x4e\x24\xff\xff\xff\xff\x00\x00\x00\x00\x00\x00\x00\x00\x02\x80\x00\x00\x00\x00\x00\x00\x04\x00\x00\x00\x00\x00\x00\x00"}, 46) = 0 ioctl(3, FS_IOC_GETFSMAP, 0) = -1 ENOTTY (Inappropriate ioctl for device) exit_group(0) = ? [ 24.543477][ T24] audit: type=1400 audit(1787979872.850:64): avc: denied { execmem } for pid=297 comm="syz-executor184" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1 [ 24.563129][ T24] audit: type=1400 audit(1787979872.860:65): avc: denied { create } for pid=297 comm="syz-executor184" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=pppox_socket permissive=1 [ 24.583059][ T297] ================================================================== [ 24.583451][ T24] audit: type=1400 audit(1787979872.860:66): avc: denied { connect } for pid=297 comm="syz-executor184" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=pppox_socket permissive=1 [ 24.591153][ T297] BUG: KASAN: use-after-free in mutex_lock+0x85/0xf0 [ 24.591170][ T297] Write of size 8 at addr ffff8881095f9d50 by task syz-executor184/297 [ 24.611300][ T24] audit: type=1400 audit(1787979872.870:67): avc: denied { ioctl } for pid=297 comm="syz-executor184" path="socket:[1598]" dev="sockfs" ino=1598 ioctlcmd=0x583b scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=pppox_socket permissive=1 [ 24.617793][ T297] [ 24.653092][ T297] CPU: 1 PID: 297 Comm: syz-executor184 Not tainted syzkaller #0 [ 24.660804][ T297] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 [ 24.670984][ T297] Call Trace: [ 24.674279][ T297] __dump_stack+0x21/0x24 [ 24.678709][ T297] dump_stack_lvl+0x1a7/0x208 [ 24.683553][ T297] ? show_regs_print_info+0x18/0x18 [ 24.688750][ T297] ? thaw_kernel_threads+0x220/0x220 [ 24.694136][ T297] print_address_description+0x7f/0x2c0 [ 24.699681][ T297] ? mutex_lock+0x85/0xf0 [ 24.704001][ T297] kasan_report+0x100/0x140 [ 24.708702][ T297] ? mutex_lock+0x85/0xf0 [ 24.713068][ T297] kasan_check_range+0x249/0x2a0 [ 24.718025][ T297] __kasan_check_write+0x14/0x20 [ 24.723275][ T297] mutex_lock+0x85/0xf0 [ 24.727445][ T297] ? mutex_trylock+0xb0/0xb0 [ 24.732039][ T297] ? l2tp_session_put+0xb2/0x1a0 [ 24.737037][ T297] ? l2tp_session_delete+0x3a9/0x4a0 [ 24.742412][ T297] pppol2tp_release+0x178/0x2b0 [ 24.747418][ T297] sock_close+0xb8/0x200 [ 24.752023][ T297] ? sock_mmap+0xa0/0xa0 [ 24.756269][ T297] __fput+0x2dc/0x730 [ 24.760371][ T297] ? _raw_spin_lock+0x94/0xf0 [ 24.765494][ T297] ____fput+0x15/0x20 [ 24.769478][ T297] task_work_run+0x127/0x190 [ 24.774173][ T297] do_exit+0xa7c/0x24e0 [ 24.778631][ T297] ? put_task_struct+0x90/0x90 [ 24.783479][ T297] ? asm_common_interrupt+0x1e/0x40 [ 24.788799][ T297] do_group_exit+0x149/0x310 [ 24.793393][ T297] __x64_sys_exit_group+0x3f/0x40 [ 24.798414][ T297] do_syscall_64+0x31/0x40 [ 24.802817][ T297] entry_SYSCALL_64_after_hwframe+0x61/0xcb [ 24.808694][ T297] RIP: 0033:0x7efd9d791305 [ 24.813314][ T297] Code: Unable to access opcode bytes at RIP 0x7efd9d7912db. [ 24.820682][ T297] RSP: 002b:00007fff09041458 EFLAGS: 00000206 ORIG_RAX: 00000000000000e7 [ 24.829174][ T297] RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 00007efd9d791305 [ 24.837132][ T297] RDX: 00000000000000e7 RSI: ffffffffffffffd8 RDI: 0000000000000000 [ 24.845090][ T297] RBP: 0000000000000000 R08: 0000000000000000 R09: 00007fff090415e8 [ 24.853058][ T297] R10: 00007fff090415e8 R11: 0000000000000206 R12: 0000000000000000 [ 24.861041][ T297] R13: 00007efd9d827110 R14: 00007efd9d8293a8 R15: 00007efd9d8293c0 [ 24.869062][ T297] [ 24.871413][ T297] Allocated by task 297: [ 24.875652][ T297] __kasan_kmalloc+0xd4/0x100 [ 24.880337][ T297] __kmalloc+0x19f/0x330 [ 24.884567][ T297] l2tp_session_create+0x39/0xb60 [ 24.889750][ T297] pppol2tp_connect+0xbf5/0x1640 [ 24.894668][ T297] __sys_connect+0x3ce/0x450 [ 24.899262][ T297] __x64_sys_connect+0x7a/0x90 [ 24.904011][ T297] do_syscall_64+0x31/0x40 [ 24.908442][ T297] entry_SYSCALL_64_after_hwframe+0x61/0xcb [ 24.914417][ T297] [ 24.916735][ T297] Freed by task 297: [ 24.920737][ T297] kasan_set_track+0x4a/0x70 [ 24.925312][ T297] kasan_set_free_info+0x23/0x40 [ 24.930244][ T297] ____kasan_slab_free+0x125/0x160 [ 24.935436][ T297] __kasan_slab_free+0x11/0x20 [ 24.940195][ T297] slab_free_freelist_hook+0xc5/0x190 [ 24.945562][ T297] kfree+0xc0/0x270 [ 24.949455][ T297] l2tp_session_put+0xb2/0x1a0 [ 24.954224][ T297] l2tp_session_delete+0x3a9/0x4a0 [ 24.959327][ T297] pppol2tp_release+0x169/0x2b0 [ 24.964171][ T297] sock_close+0xb8/0x200 [ 24.968409][ T297] __fput+0x2dc/0x730 [ 24.972384][ T297] ____fput+0x15/0x20 [ 24.976357][ T297] task_work_run+0x127/0x190 [ 24.980950][ T297] do_exit+0xa7c/0x24e0 [ 24.985187][ T297] do_group_exit+0x149/0x310 [ 24.989771][ T297] __x64_sys_exit_group+0x3f/0x40 [ 24.994792][ T297] do_syscall_64+0x31/0x40 [ 24.999201][ T297] entry_SYSCALL_64_after_hwframe+0x61/0xcb [ 25.005088][ T297] [ 25.007411][ T297] The buggy address belongs to the object at ffff8881095f9c00 [ 25.007411][ T297] which belongs to the cache kmalloc-512 of size 512 [ 25.021458][ T297] The buggy address is located 336 bytes inside of [ 25.021458][ T297] 512-byte region [ffff8881095f9c00, ffff8881095f9e00) [ 25.034720][ T297] The buggy address belongs to the page: [ 25.040352][ T297] page:ffffea0004257e00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1095f8 [ 25.050580][ T297] head:ffffea0004257e00 order:2 compound_mapcount:0 compound_pincount:0 [ 25.058896][ T297] flags: 0x4000000000010200(slab|head) [ 25.064353][ T297] raw: 4000000000010200 ffffea0004254a00 0000000200000002 ffff888100043080 [ 25.072932][ T297] raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000 [ 25.081612][ T297] page dumped because: kasan: bad access detected [ 25.088016][ T297] page_owner tracks the page as allocated [ 25.093731][ 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 1988753243, free_ts 0 [ 25.111757][ T297] prep_new_page+0x176/0x190 [ 25.116357][ T297] get_page_from_freelist+0x225f/0x23f0 [ 25.121893][ T297] __alloc_pages_nodemask+0x29a/0x640 [ 25.127253][ T297] new_slab+0x84/0x3f0 [ 25.131311][ T297] ___slab_alloc+0x2f8/0x4c0 [ 25.136162][ T297] __slab_alloc+0x63/0xa0 [ 25.140488][ T297] kmem_cache_alloc_trace+0x1a8/0x2e0 [ 25.145849][ T297] efi_partition+0x3dc/0x2f40 [ 25.150516][ T297] blk_add_partitions+0x45c/0x1150 [ 25.155638][ T297] bdev_disk_changed+0x3d5/0x4d0 [ 25.160568][ T297] __blkdev_get+0xa02/0x13c0 [ 25.165148][ T297] blkdev_get_by_dev+0x306/0x540 [ 25.170078][ T297] __device_add_disk+0x987/0x1010 [ 25.175096][ T297] device_add_disk+0x2a/0x40 [ 25.179676][ T297] brd_init+0x284/0x468 [ 25.183911][ T297] do_one_initcall+0x205/0x5e0 [ 25.188759][ T297] page_owner free stack trace missing [ 25.194116][ T297] [ 25.196431][ T297] Memory state around the buggy address: [ 25.202051][ T297] ffff8881095f9c00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 25.210103][ T297] ffff8881095f9c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 25.218159][ T297] >ffff8881095f9d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 25.226222][ T297] ^ [ 25.232886][ T297] ffff8881095f9d80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb +++ exited with 0 +++ [ 25.240944][ T297] ffff8881095f9e00: fc fc fc fc fc fc fc fc fc