ci2-android-5-10/strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ci2-android-5-10/syz-executor1039269801 <...> syzkaller syzkaller login: [ 30.047418][ T24] kauditd_printk_skb: 7 callbacks suppressed [ 30.047431][ T24] audit: type=1400 audit(1787931509.390:59): avc: denied { transition } for pid=259 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 [ 30.059623][ T24] audit: type=1400 audit(1787931509.390:60): avc: denied { noatsecure } for pid=259 comm="sshd-session" scontext=system_u:system_r:sshd_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1 [ 30.069040][ T24] audit: type=1400 audit(1787931509.400:61): avc: denied { write } for pid=259 comm="sh" path="pipe:[1348]" dev="pipefs" ino=1348 scontext=root:sysadm_r:sysadm_t tcontext=system_u:system_r:sshd_t tclass=fifo_file permissive=1 [ 30.091303][ T24] audit: type=1400 audit(1787931509.400:62): avc: denied { rlimitinh } for pid=259 comm="sh" scontext=system_u:system_r:sshd_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1 [ 30.110103][ T24] audit: type=1400 audit(1787931509.410:63): avc: denied { siginh } for pid=259 comm="sh" scontext=system_u:system_r:sshd_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1 Warning: Permanently added '10.128.0.180' (ED25519) to the list of known hosts. execve("ci2-android-5-10/syz-executor1039269801", ["ci2-android-5-10/syz-executor1039269801"], 0x7ffcb4c6efc0 /* 10 vars */) = 0 brk(NULL) = 0x5555836c5000 brk(0x5555836c5d40) = 0x5555836c5d40 arch_prctl(ARCH_SET_FS, 0x5555836c53c0) = 0 set_tid_address(0x5555836c5690) = 297 set_robust_list(0x5555836c56a0, 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-executor1039269801", 4096) = 45 getrandom("\x4a\xd4\x1e\x96\x59\xe3\x39\xaa", 8, GRND_NONBLOCK) = 8 brk(NULL) = 0x5555836c5d40 brk(0x5555836e6d40) = 0x5555836e6d40 brk(0x5555836e7000) = 0x5555836e7000 mprotect(0x7fa8686eb000, 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) = ? [ 52.664111][ T24] audit: type=1400 audit(1787931532.010:64): avc: denied { execmem } for pid=297 comm="syz-executor103" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1 [ 52.683628][ T24] audit: type=1400 audit(1787931532.020:65): avc: denied { create } for pid=297 comm="syz-executor103" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=pppox_socket permissive=1 [ 52.689817][ T297] ================================================================== [ 52.705100][ T24] audit: type=1400 audit(1787931532.030:66): avc: denied { connect } for pid=297 comm="syz-executor103" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=pppox_socket permissive=1 [ 52.712017][ T297] BUG: KASAN: use-after-free in mutex_lock+0x85/0xf0 [ 52.712063][ T297] Write of size 8 at addr ffff88810add4d50 by task syz-executor103/297 [ 52.732311][ T24] audit: type=1400 audit(1787931532.030:67): avc: denied { ioctl } for pid=297 comm="syz-executor103" path="socket:[14642]" dev="sockfs" ino=14642 ioctlcmd=0x5840 scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=pppox_socket permissive=1 [ 52.738503][ T297] [ 52.774093][ T297] CPU: 0 PID: 297 Comm: syz-executor103 Not tainted syzkaller #0 [ 52.781805][ T297] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 [ 52.791887][ T297] Call Trace: [ 52.795189][ T297] __dump_stack+0x21/0x24 [ 52.799573][ T297] dump_stack_lvl+0x1a7/0x208 [ 52.804254][ T297] ? show_regs_print_info+0x18/0x18 [ 52.809471][ T297] ? thaw_kernel_threads+0x220/0x220 [ 52.814757][ T297] print_address_description+0x7f/0x2c0 [ 52.820308][ T297] ? mutex_lock+0x85/0xf0 [ 52.824655][ T297] kasan_report+0x100/0x140 [ 52.829168][ T297] ? mutex_lock+0x85/0xf0 [ 52.833497][ T297] kasan_check_range+0x249/0x2a0 [ 52.838453][ T297] __kasan_check_write+0x14/0x20 [ 52.843389][ T297] mutex_lock+0x85/0xf0 [ 52.847542][ T297] ? mutex_trylock+0xb0/0xb0 [ 52.852145][ T297] ? l2tp_session_put+0xb2/0x1a0 [ 52.857075][ T297] ? l2tp_session_delete+0x3a9/0x4a0 [ 52.862357][ T297] pppol2tp_release+0x178/0x2b0 [ 52.867207][ T297] sock_close+0xb8/0x200 [ 52.871473][ T297] ? sock_mmap+0xa0/0xa0 [ 52.875716][ T297] __fput+0x2dc/0x730 [ 52.879698][ T297] ? _raw_spin_lock+0x94/0xf0 [ 52.884377][ T297] ____fput+0x15/0x20 [ 52.888355][ T297] task_work_run+0x127/0x190 [ 52.892942][ T297] do_exit+0xa7c/0x24e0 [ 52.897097][ T297] ? ptrace_notify+0x1ea/0x270 [ 52.901858][ T297] ? put_task_struct+0x90/0x90 [ 52.906622][ T297] ? do_notify_parent+0x810/0x810 [ 52.911648][ T297] do_group_exit+0x149/0x310 [ 52.916319][ T297] __x64_sys_exit_group+0x3f/0x40 [ 52.921345][ T297] do_syscall_64+0x31/0x40 [ 52.925759][ T297] entry_SYSCALL_64_after_hwframe+0x61/0xcb [ 52.931644][ T297] RIP: 0033:0x7fa86865a305 [ 52.936054][ T297] Code: Unable to access opcode bytes at RIP 0x7fa86865a2db. [ 52.943418][ T297] RSP: 002b:00007ffc51ad8948 EFLAGS: 00000202 ORIG_RAX: 00000000000000e7 [ 52.951831][ T297] RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 00007fa86865a305 [ 52.959805][ T297] RDX: 00000000000000e7 RSI: ffffffffffffffd8 RDI: 0000000000000000 [ 52.968294][ T297] RBP: 0000000000000000 R08: 0000000000000000 R09: 00007ffc51ad8ad8 [ 52.976266][ T297] R10: 00000000fffffffd R11: 0000000000000202 R12: 0000000000000000 [ 52.984239][ T297] R13: 00007fa8686f0110 R14: 00007fa8686f23a8 R15: 00007fa8686f23c0 [ 52.992228][ T297] [ 52.994556][ T297] Allocated by task 297: [ 52.998825][ T297] __kasan_kmalloc+0xd4/0x100 [ 53.003502][ T297] __kmalloc+0x19f/0x330 [ 53.007745][ T297] l2tp_session_create+0x39/0xb60 [ 53.012765][ T297] pppol2tp_connect+0xbf5/0x1640 [ 53.017712][ T297] __sys_connect+0x3ce/0x450 [ 53.022312][ T297] __x64_sys_connect+0x7a/0x90 [ 53.027074][ T297] do_syscall_64+0x31/0x40 [ 53.031489][ T297] entry_SYSCALL_64_after_hwframe+0x61/0xcb [ 53.037457][ T297] [ 53.039786][ T297] Freed by task 297: [ 53.043730][ T297] kasan_set_track+0x4a/0x70 [ 53.048314][ T297] kasan_set_free_info+0x23/0x40 [ 53.053265][ T297] ____kasan_slab_free+0x125/0x160 [ 53.058382][ T297] __kasan_slab_free+0x11/0x20 [ 53.063159][ T297] slab_free_freelist_hook+0xc5/0x190 [ 53.068545][ T297] kfree+0xc0/0x270 [ 53.072367][ T297] l2tp_session_put+0xb2/0x1a0 [ 53.077156][ T297] l2tp_session_delete+0x3a9/0x4a0 [ 53.082280][ T297] pppol2tp_release+0x169/0x2b0 [ 53.087147][ T297] sock_close+0xb8/0x200 [ 53.091405][ T297] __fput+0x2dc/0x730 [ 53.095397][ T297] ____fput+0x15/0x20 [ 53.099384][ T297] task_work_run+0x127/0x190 [ 53.103981][ T297] do_exit+0xa7c/0x24e0 [ 53.108137][ T297] do_group_exit+0x149/0x310 [ 53.112735][ T297] __x64_sys_exit_group+0x3f/0x40 [ 53.117761][ T297] do_syscall_64+0x31/0x40 [ 53.122177][ T297] entry_SYSCALL_64_after_hwframe+0x61/0xcb [ 53.128066][ T297] [ 53.130399][ T297] Last potentially related work creation: [ 53.136131][ T297] kasan_save_stack+0x3a/0x60 [ 53.140811][ T297] __kasan_record_aux_stack+0xd2/0x100 [ 53.146269][ T297] kasan_record_aux_stack_noalloc+0xb/0x10 [ 53.152085][ T297] call_rcu+0x11a/0x1090 [ 53.156330][ T297] blkg_release+0x23/0x30 [ 53.160667][ T297] percpu_ref_switch_to_atomic_rcu+0x5a3/0x5b0 [ 53.166818][ T297] rcu_do_batch+0x488/0xaf0 [ 53.171323][ T297] rcu_core+0x50a/0xca0 [ 53.175483][ T297] rcu_core_si+0x9/0x10 [ 53.179640][ T297] __do_softirq+0x255/0x563 [ 53.184140][ T297] [ 53.186479][ T297] The buggy address belongs to the object at ffff88810add4c00 [ 53.186479][ T297] which belongs to the cache kmalloc-512 of size 512 [ 53.200536][ T297] The buggy address is located 336 bytes inside of [ 53.200536][ T297] 512-byte region [ffff88810add4c00, ffff88810add4e00) [ 53.213828][ T297] The buggy address belongs to the page: [ 53.219483][ T297] page:ffffea00042b7500 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10add4 [ 53.229720][ T297] head:ffffea00042b7500 order:2 compound_mapcount:0 compound_pincount:0 [ 53.238150][ T297] flags: 0x4000000000010200(slab|head) [ 53.243639][ T297] raw: 4000000000010200 dead000000000100 dead000000000122 ffff888100043080 [ 53.252243][ T297] raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000 [ 53.260827][ T297] page dumped because: kasan: bad access detected [ 53.267256][ T297] page_owner tracks the page as allocated [ 53.272991][ 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 2805193115, free_ts 0 [ 53.291019][ T297] prep_new_page+0x176/0x190 [ 53.295634][ T297] get_page_from_freelist+0x225f/0x23f0 [ 53.301189][ T297] __alloc_pages_nodemask+0x29a/0x640 [ 53.306572][ T297] new_slab+0x84/0x3f0 [ 53.310651][ T297] ___slab_alloc+0x2f8/0x4c0 [ 53.315245][ T297] __slab_alloc+0x63/0xa0 [ 53.319586][ T297] kmem_cache_alloc_trace+0x1a8/0x2e0 [ 53.324978][ T297] blkg_alloc+0x6d/0x570 [ 53.329242][ T297] blkcg_init_queue+0x2d/0x330 [ 53.334014][ T297] blk_alloc_queue+0x444/0x5f0 [ 53.338876][ T297] blk_mq_init_queue+0x37/0xd0 [ 53.343649][ T297] scsi_mq_alloc_queue+0x42/0x140 [ 53.348698][ T297] scsi_alloc_sdev+0x611/0x920 [ 53.353479][ T297] scsi_probe_and_add_lun+0x17d/0x3370 [ 53.358949][ T297] __scsi_scan_target+0x1d2/0xbf0 [ 53.364007][ T297] scsi_scan_host_selected+0x34e/0x600 [ 53.369466][ T297] page_owner free stack trace missing [ 53.374839][ T297] [ 53.377184][ T297] Memory state around the buggy address: [ 53.382831][ T297] ffff88810add4c00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 53.391028][ T297] ffff88810add4c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 53.399136][ T297] >ffff88810add4d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 53.407333][ T297] ^ +++ exited with 0 +++ [ 53.414034][ T297] ffff88810add4d80: fb fb