ci2-android-5-10/strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ci2-android-5-10/syz-executor2243595139 <...> Warning: Permanently added '10.128.1.112' (ED25519) to the list of known hosts. execve("ci2-android-5-10/syz-executor2243595139", ["ci2-android-5-10/syz-executor2243595139"], 0x7fff8fe2c8c0 /* 10 vars */) = 0 brk(NULL) = 0x55555c0a9000 brk(0x55555c0a9d40) = 0x55555c0a9d40 arch_prctl(ARCH_SET_FS, 0x55555c0a93c0) = 0 set_tid_address(0x55555c0a9690) = 297 set_robust_list(0x55555c0a96a0, 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-executor2243595139", 4096) = 45 getrandom("\x54\x5d\x54\xbb\x69\x38\xda\xe4", 8, GRND_NONBLOCK) = 8 brk(NULL) = 0x55555c0a9d40 brk(0x55555c0cad40) = 0x55555c0cad40 brk(0x55555c0cb000) = 0x55555c0cb000 mprotect(0x7f26c8920000, 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 getrandom("\x6e\xd9\xb1\x5a\x6c\xc4\x22\x35", 8, GRND_NONBLOCK) = 8 mkdir("./syzkaller.64FztU", 0700) = 0 chmod("./syzkaller.64FztU", 0777) = 0 chdir("./syzkaller.64FztU") = 0 executing program write(1, "executing program\n", 18) = 18 socket(AF_PPPOX, SOCK_STREAM, 1) = 3 socket(AF_INET6, SOCK_DGRAM, IPPROTO_IP) = 4 [ 25.007993][ T24] audit: type=1400 audit(1785817622.980:64): avc: denied { execmem } for pid=297 comm="syz-executor224" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1 [ 25.031248][ T24] audit: type=1400 audit(1785817623.010:65): avc: denied { create } for pid=297 comm="syz-executor224" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=pppox_socket permissive=1 connect(3, {sa_family=AF_PPPOX, sa_data="\x01\x00\x00\x00\x03\x00\x00\x00\x04\x00\x00\x00\x02\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"}, 46) = 0 ioctl(3, BTRFS_IOC_GET_DEV_STATS, NULL) = -1 ENOTTY (Inappropriate ioctl for device) exit_group(0) = ? [ 25.051264][ T24] audit: type=1400 audit(1785817623.010:66): avc: denied { connect } for pid=297 comm="syz-executor224" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=pppox_socket permissive=1 [ 25.071943][ T24] audit: type=1400 audit(1785817623.050:67): avc: denied { ioctl } for pid=297 comm="syz-executor224" path="socket:[1607]" dev="sockfs" ino=1607 ioctlcmd=0x9434 scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=pppox_socket permissive=1 [ 25.097471][ T297] ================================================================== [ 25.105596][ T297] BUG: KASAN: use-after-free in mutex_lock+0x85/0xf0 [ 25.112528][ T297] Write of size 8 at addr ffff88810b3b3150 by task syz-executor224/297 [ 25.120755][ T297] [ 25.123188][ T297] CPU: 1 PID: 297 Comm: syz-executor224 Not tainted syzkaller #0 [ 25.131167][ T297] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 [ 25.141907][ T297] Call Trace: [ 25.145196][ T297] __dump_stack+0x21/0x24 [ 25.149703][ T297] dump_stack_lvl+0x1a7/0x208 [ 25.155152][ T297] ? show_regs_print_info+0x18/0x18 [ 25.160362][ T297] ? thaw_kernel_threads+0x220/0x220 [ 25.165638][ T297] print_address_description+0x7f/0x2c0 [ 25.171171][ T297] ? mutex_lock+0x85/0xf0 [ 25.175488][ T297] kasan_report+0x100/0x140 [ 25.179976][ T297] ? mutex_lock+0x85/0xf0 [ 25.184295][ T297] kasan_check_range+0x249/0x2a0 [ 25.189316][ T297] __kasan_check_write+0x14/0x20 [ 25.194240][ T297] mutex_lock+0x85/0xf0 [ 25.198388][ T297] ? mutex_trylock+0xb0/0xb0 [ 25.202993][ T297] ? l2tp_session_put+0xb2/0x1a0 [ 25.207918][ T297] ? l2tp_session_delete+0x3a9/0x4a0 [ 25.213192][ T297] pppol2tp_release+0x178/0x2b0 [ 25.218048][ T297] sock_close+0xb8/0x200 [ 25.222276][ T297] ? sock_mmap+0xa0/0xa0 [ 25.226604][ T297] __fput+0x2dc/0x730 [ 25.230591][ T297] ? _raw_spin_lock+0x94/0xf0 [ 25.235351][ T297] ____fput+0x15/0x20 [ 25.239331][ T297] task_work_run+0x127/0x190 [ 25.243912][ T297] do_exit+0xa7c/0x24e0 [ 25.248061][ T297] ? ptrace_notify+0x1ea/0x270 [ 25.252835][ T297] ? put_task_struct+0x90/0x90 [ 25.257591][ T297] ? do_notify_parent+0x810/0x810 [ 25.262951][ T297] do_group_exit+0x149/0x310 [ 25.267535][ T297] __x64_sys_exit_group+0x3f/0x40 [ 25.272550][ T297] do_syscall_64+0x31/0x40 [ 25.276961][ T297] entry_SYSCALL_64_after_hwframe+0x61/0xcb [ 25.282933][ T297] RIP: 0033:0x7f26c888f345 [ 25.287347][ T297] Code: Unable to access opcode bytes at RIP 0x7f26c888f31b. [ 25.294699][ T297] RSP: 002b:00007ffdf90407f8 EFLAGS: 00000202 ORIG_RAX: 00000000000000e7 [ 25.303098][ T297] RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 00007f26c888f345 [ 25.311057][ T297] RDX: 00000000000000e7 RSI: ffffffffffffffd8 RDI: 0000000000000000 [ 25.319034][ T297] RBP: 0000000000000000 R08: 0000000000000000 R09: 6c616b7a79732f2e [ 25.326998][ T297] R10: 6c616b7a79732f2e R11: 0000000000000202 R12: 0000000000000000 [ 25.334976][ T297] R13: 00007f26c8925110 R14: 00007f26c89273a8 R15: 00007f26c89273c0 [ 25.342941][ T297] [ 25.345280][ T297] Allocated by task 297: [ 25.349516][ T297] __kasan_kmalloc+0xd4/0x100 [ 25.354181][ T297] __kmalloc+0x19f/0x330 [ 25.358410][ T297] l2tp_session_create+0x39/0xb60 [ 25.363420][ T297] pppol2tp_connect+0xbf5/0x1640 [ 25.368353][ T297] __sys_connect+0x3ce/0x450 [ 25.372942][ T297] __x64_sys_connect+0x7a/0x90 [ 25.377712][ T297] do_syscall_64+0x31/0x40 [ 25.382138][ T297] entry_SYSCALL_64_after_hwframe+0x61/0xcb [ 25.388023][ T297] [ 25.390351][ T297] Freed by task 297: [ 25.394260][ T297] kasan_set_track+0x4a/0x70 [ 25.398855][ T297] kasan_set_free_info+0x23/0x40 [ 25.403800][ T297] ____kasan_slab_free+0x125/0x160 [ 25.408917][ T297] __kasan_slab_free+0x11/0x20 [ 25.413680][ T297] slab_free_freelist_hook+0xc5/0x190 [ 25.419056][ T297] kfree+0xc0/0x270 [ 25.422869][ T297] l2tp_session_put+0xb2/0x1a0 [ 25.427635][ T297] l2tp_session_delete+0x3a9/0x4a0 [ 25.432765][ T297] pppol2tp_release+0x169/0x2b0 [ 25.437616][ T297] sock_close+0xb8/0x200 [ 25.441859][ T297] __fput+0x2dc/0x730 [ 25.445850][ T297] ____fput+0x15/0x20 [ 25.449834][ T297] task_work_run+0x127/0x190 [ 25.454427][ T297] do_exit+0xa7c/0x24e0 [ 25.458586][ T297] do_group_exit+0x149/0x310 [ 25.463208][ T297] __x64_sys_exit_group+0x3f/0x40 [ 25.468235][ T297] do_syscall_64+0x31/0x40 [ 25.472651][ T297] entry_SYSCALL_64_after_hwframe+0x61/0xcb [ 25.478545][ T297] [ 25.480879][ T297] Last potentially related work creation: [ 25.486615][ T297] kasan_save_stack+0x3a/0x60 [ 25.491302][ T297] __kasan_record_aux_stack+0xd2/0x100 [ 25.496771][ T297] kasan_record_aux_stack_noalloc+0xb/0x10 [ 25.502581][ T297] call_rcu+0x11a/0x1090 [ 25.506844][ T297] blkg_release+0x23/0x30 [ 25.511277][ T297] percpu_ref_switch_to_atomic_rcu+0x5a3/0x5b0 [ 25.517443][ T297] rcu_do_batch+0x488/0xaf0 [ 25.521959][ T297] rcu_core+0x50a/0xca0 [ 25.526153][ T297] rcu_core_si+0x9/0x10 [ 25.530318][ T297] __do_softirq+0x255/0x563 [ 25.534816][ T297] [ 25.537159][ T297] The buggy address belongs to the object at ffff88810b3b3000 [ 25.537159][ T297] which belongs to the cache kmalloc-512 of size 512 [ 25.551305][ T297] The buggy address is located 336 bytes inside of [ 25.551305][ T297] 512-byte region [ffff88810b3b3000, ffff88810b3b3200) [ 25.565009][ T297] The buggy address belongs to the page: [ 25.570669][ T297] page:ffffea00042cec00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10b3b0 [ 25.580904][ T297] head:ffffea00042cec00 order:2 compound_mapcount:0 compound_pincount:0 [ 25.589230][ T297] flags: 0x4000000000010200(slab|head) [ 25.594700][ T297] raw: 4000000000010200 ffffea00042cc900 0000000300000003 ffff888100043080 [ 25.603308][ T297] raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000 [ 25.611917][ T297] page dumped because: kasan: bad access detected [ 25.618339][ T297] page_owner tracks the page as allocated [ 25.624077][ 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 2504146668, free_ts 0 [ 25.641955][ T297] prep_new_page+0x176/0x190 [ 25.646551][ T297] get_page_from_freelist+0x225f/0x23f0 [ 25.652111][ T297] __alloc_pages_nodemask+0x29a/0x640 [ 25.657483][ T297] new_slab+0x84/0x3f0 [ 25.661554][ T297] ___slab_alloc+0x2f8/0x4c0 [ 25.666146][ T297] __slab_alloc+0x63/0xa0 [ 25.670476][ T297] kmem_cache_alloc_trace+0x1a8/0x2e0 [ 25.675855][ T297] blkg_alloc+0x6d/0x570 [ 25.680098][ T297] blkcg_init_queue+0x2d/0x330 [ 25.684869][ T297] blk_alloc_queue+0x444/0x5f0 [ 25.689662][ T297] blk_mq_init_queue+0x37/0xd0 [ 25.694431][ T297] scsi_mq_alloc_queue+0x42/0x140 [ 25.699459][ T297] scsi_alloc_sdev+0x611/0x920 [ 25.704225][ T297] scsi_probe_and_add_lun+0x17d/0x3370 [ 25.709684][ T297] __scsi_scan_target+0x1d2/0xbf0 [ 25.714712][ T297] scsi_scan_host_selected+0x34e/0x600 [ 25.720170][ T297] page_owner free stack trace missing [ 25.725535][ T297] [ 25.727861][ T297] Memory state around the buggy address: [ 25.733496][ T297] ffff88810b3b3000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 25.741737][ T297] ffff88810b3b3080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 25.749803][ T297] >ffff88810b3b3100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb +++ exited with 0 +++ [ 25.757869][ T297]