ci2-android-5-10/strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ci2-android-5-10/syz-executor1933536226 <...> Warning: Permanently added '10.128.0.108' (ED25519) to the list of known hosts. execve("ci2-android-5-10/syz-executor1933536226", ["ci2-android-5-10/syz-executor1933536226"], 0x7fffe8889900 /* 10 vars */) = 0 brk(NULL) = 0x55558e7b6000 brk(0x55558e7b6d40) = 0x55558e7b6d40 arch_prctl(ARCH_SET_FS, 0x55558e7b63c0) = 0 set_tid_address(0x55558e7b6690) = 297 set_robust_list(0x55558e7b66a0, 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-executor1933536226", 4096) = 45 getrandom("\x9c\xe1\x6c\x9b\xef\xb0\xae\xf9", 8, GRND_NONBLOCK) = 8 brk(NULL) = 0x55558e7b6d40 brk(0x55558e7d7d40) = 0x55558e7d7d40 brk(0x55558e7d8000) = 0x55558e7d8000 mprotect(0x7fda3ac1c000, 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 write(1, "executing program\n", 18) = 18 executing program 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\x08\x00\x00\x00\x00\x00\x00\x00\x0a\x00\x00\x00\x00\x00\x00\x00\x20\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x00\x00\x00"}, 50) = 0 sendfile(-1, -1, [3], 2757) = -1 EBADF (Bad file descriptor) clone3({flags=CLONE_UNTRACED|CLONE_CHILD_SETTID|CLONE_NEWCGROUP|CLONE_NEWPID, child_tid=NULL, exit_signal=SIGRT_7, stack=NULL, stack_size=0, cgroup=4294967295}, 88) = 298 ioctl(3, PPPIOCSMRU, 0) = -1 ENOSYS (Function not implemented) exit_group(0) = ? +++ exited with 0 +++ [ 21.787546][ T24] audit: type=1400 audit(1791462381.789:64): avc: denied { execmem } for pid=297 comm="syz-executor193" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1 [ 21.807199][ T24] audit: type=1400 audit(1791462381.799:65): avc: denied { create } for pid=297 comm="syz-executor193" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=pppox_socket permissive=1 [ 21.827545][ T24] audit: type=1400 audit(1791462381.799:66): avc: denied { connect } for pid=297 comm="syz-executor193" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=pppox_socket permissive=1 [ 21.847575][ T24] audit: type=1400 audit(1791462381.809:67): avc: denied { ioctl } for pid=297 comm="syz-executor193" path="socket:[13284]" dev="sockfs" ino=13284 ioctlcmd=0x7452 scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=pppox_socket permissive=1 [ 21.978129][ T298] ================================================================== [ 21.986216][ T298] BUG: KASAN: use-after-free in pppol2tp_sock_to_session+0x1a0/0x1b0 [ 21.994256][ T298] Read of size 4 at addr ffff88810ab47800 by task syz-executor193/298 [ 22.002373][ T298] [ 22.004684][ T298] CPU: 0 PID: 298 Comm: syz-executor193 Not tainted syzkaller #0 [ 22.012384][ T298] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026 [ 22.022433][ T298] Call Trace: [ 22.025710][ T298] __dump_stack+0x21/0x24 [ 22.030012][ T298] dump_stack_lvl+0x1a7/0x208 [ 22.034660][ T298] ? show_regs_print_info+0x18/0x18 [ 22.039831][ T298] ? thaw_kernel_threads+0x220/0x220 [ 22.045087][ T298] ? __local_bh_enable_ip+0x53/0x80 [ 22.050261][ T298] print_address_description+0x7f/0x2c0 [ 22.055793][ T298] ? pppol2tp_sock_to_session+0x1a0/0x1b0 [ 22.061484][ T298] kasan_report+0x100/0x140 [ 22.065959][ T298] ? pppol2tp_sock_to_session+0x1a0/0x1b0 [ 22.071648][ T298] __asan_report_load4_noabort+0x14/0x20 [ 22.077255][ T298] pppol2tp_sock_to_session+0x1a0/0x1b0 [ 22.082773][ T298] pppol2tp_release+0x150/0x2b0 [ 22.087594][ T298] sock_close+0xb8/0x200 [ 22.091810][ T298] ? sock_mmap+0xa0/0xa0 [ 22.096022][ T298] __fput+0x2dc/0x730 [ 22.099982][ T298] ____fput+0x15/0x20 [ 22.103938][ T298] task_work_run+0x127/0x190 [ 22.108497][ T298] do_exit+0xa7c/0x24e0 [ 22.112644][ T298] ? __kasan_check_write+0x14/0x20 [ 22.117728][ T298] ? switch_fpu_return+0x19c/0x330 [ 22.122809][ T298] ? put_task_struct+0x90/0x90 [ 22.127543][ T298] ? fpu__clear_all+0x20/0x20 [ 22.132192][ T298] ? __kasan_check_read+0x11/0x20 [ 22.137186][ T298] __x64_sys_exit+0x40/0x40 [ 22.141661][ T298] do_syscall_64+0x31/0x40 [ 22.146065][ T298] entry_SYSCALL_64_after_hwframe+0x61/0xcb [ 22.151929][ T298] RIP: 0033:0x7fda3ab8bd79 [ 22.156313][ T298] Code: Unable to access opcode bytes at RIP 0x7fda3ab8bd4f. [ 22.163665][ T298] RSP: 002b:00007ffeddd105c8 EFLAGS: 00000246 ORIG_RAX: 000000000000003c [ 22.172063][ T298] RAX: ffffffffffffffda RBX: 0000200000000040 RCX: 00007fda3ab8bd79 [ 22.180006][ T298] RDX: 00007fda3ab9d557 RSI: 0000000000000000 RDI: 0000000000000000 [ 22.187950][ T298] RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000023800000 [ 22.195894][ T298] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffeddd107e8 [ 22.203836][ T298] R13: 0000000000000002 R14: 00007fda3ac1cca0 R15: 0000000000000002 [ 22.211779][ T298] [ 22.214101][ T298] Allocated by task 297: [ 22.218323][ T298] __kasan_kmalloc+0xd4/0x100 [ 22.222971][ T298] __kmalloc+0x19f/0x330 [ 22.227185][ T298] l2tp_session_create+0x39/0xb60 [ 22.232180][ T298] pppol2tp_connect+0xbf5/0x1640 [ 22.237087][ T298] __sys_connect+0x3ce/0x450 [ 22.241666][ T298] __x64_sys_connect+0x7a/0x90 [ 22.246404][ T298] do_syscall_64+0x31/0x40 [ 22.250811][ T298] entry_SYSCALL_64_after_hwframe+0x61/0xcb [ 22.256669][ T298] [ 22.258971][ T298] Freed by task 49: [ 22.262750][ T298] kasan_set_track+0x4a/0x70 [ 22.267317][ T298] kasan_set_free_info+0x23/0x40 [ 22.272224][ T298] ____kasan_slab_free+0x125/0x160 [ 22.277304][ T298] __kasan_slab_free+0x11/0x20 [ 22.282038][ T298] slab_free_freelist_hook+0xc5/0x190 [ 22.287392][ T298] kfree+0xc0/0x270 [ 22.291173][ T298] l2tp_session_put+0xb2/0x1a0 [ 22.295906][ T298] l2tp_session_delete+0x3a9/0x4a0 [ 22.300995][ T298] l2tp_tunnel_del_work+0x180/0x3d0 [ 22.306162][ T298] process_one_work+0x6fd/0xbc0 [ 22.310983][ T298] worker_thread+0xa8e/0x13c0 [ 22.315626][ T298] kthread+0x324/0x3b0 [ 22.319666][ T298] ret_from_fork+0x1f/0x30 [ 22.324048][ T298] [ 22.326366][ T298] Last potentially related work creation: [ 22.332062][ T298] kasan_save_stack+0x3a/0x60 [ 22.336708][ T298] __kasan_record_aux_stack+0xd2/0x100 [ 22.342137][ T298] kasan_record_aux_stack_noalloc+0xb/0x10 [ 22.347914][ T298] call_rcu+0x11a/0x1090 [ 22.352125][ T298] blkg_release+0x23/0x30 [ 22.356425][ T298] percpu_ref_switch_to_atomic_rcu+0x5a3/0x5b0 [ 22.362552][ T298] rcu_do_batch+0x488/0xaf0 [ 22.367028][ T298] rcu_core+0x50a/0xca0 [ 22.371155][ T298] rcu_core_si+0x9/0x10 [ 22.375279][ T298] __do_softirq+0x255/0x563 [ 22.379754][ T298] [ 22.382067][ T298] The buggy address belongs to the object at ffff88810ab47800 [ 22.382067][ T298] which belongs to the cache kmalloc-512 of size 512 [ 22.396127][ T298] The buggy address is located 0 bytes inside of [ 22.396127][ T298] 512-byte region [ffff88810ab47800, ffff88810ab47a00) [ 22.409200][ T298] The buggy address belongs to the page: [ 22.414822][ T298] page:ffffea00042ad100 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10ab44 [ 22.425025][ T298] head:ffffea00042ad100 order:2 compound_mapcount:0 compound_pincount:0 [ 22.433326][ T298] flags: 0x4000000000010200(slab|head) [ 22.438755][ T298] raw: 4000000000010200 0000000000000000 0000000100000001 ffff888100043080 [ 22.447321][ T298] raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000 [ 22.455886][ T298] page dumped because: kasan: bad access detected [ 22.462287][ T298] page_owner tracks the page as allocated [ 22.467988][ T298] 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 1785831545, free_ts 0 [ 22.485840][ T298] prep_new_page+0x176/0x190 [ 22.490401][ T298] get_page_from_freelist+0x225f/0x23f0 [ 22.495915][ T298] __alloc_pages_nodemask+0x29a/0x640 [ 22.501258][ T298] new_slab+0x84/0x3f0 [ 22.505339][ T298] ___slab_alloc+0x2f8/0x4c0 [ 22.509903][ T298] __slab_alloc+0x63/0xa0 [ 22.514209][ T298] kmem_cache_alloc_trace+0x1a8/0x2e0 [ 22.519554][ T298] blkg_alloc+0x6d/0x570 [ 22.523769][ T298] blkcg_init_queue+0x2d/0x330 [ 22.528510][ T298] blk_alloc_queue+0x444/0x5f0 [ 22.533249][ T298] blk_mq_init_queue+0x37/0xd0 [ 22.537988][ T298] scsi_mq_alloc_queue+0x42/0x140 [ 22.542985][ T298] scsi_alloc_sdev+0x611/0x920 [ 22.547728][ T298] scsi_probe_and_add_lun+0x17d/0x3370 [ 22.553158][ T298] __scsi_scan_target+0x1d2/0xbf0 [ 22.558153][ T298] scsi_scan_host_selected+0x34e/0x600 [ 22.563576][ T298] page_owner free stack trace missing [ 22.568912][ T298] [ 22.571214][ T298] Memory state around the buggy address: [ 22.576819][ T298] ffff88810ab47700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 22.584852][ T298] ffff88810ab47780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 22.592885][ T298] >ffff88810ab47800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 22.600915][ T298] ^ [ 22.604955][ T298] ffff88810ab47880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 22.612987][ T298] ffff88810ab47900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 22.621034][ T298] ================================================================== [ 22.629063][ T298] Disabling lock debugging due to kernel taint [ 22.635389][ T298] ------------[ cut here ]------------ [ 22.640915][ T298] WARNING: CPU: 1 PID: 298 at net/l2tp/l2tp_ppp.c:156 pppol2tp_sock_to_session+0x167/0x1b0 [ 22.645060][ T24] audit: type=1400 audit(1791462382.649:68): avc: denied { read } for pid=77 comm="syslogd" name="log" dev="sda1" ino=2010 scontext=system_u:system_r:syslogd_t tcontext=system_u:object_r:var_t tclass=lnk_file permissive=1 [ 22.672491][ T298] Modules linked in: [ 22.673229][ T24] audit: type=1400 audit(1791462382.649:69): avc: denied { search } for pid=77 comm="syslogd" name="/" dev="tmpfs" ino=1 scontext=system_u:system_r:syslogd_t tcontext=system_u:object_r:tmpfs_t tclass=dir permissive=1 [ 22.676385][ T298] CPU: 1 PID: 298 Comm: syz-executor193 Tainted: G B syzkaller #0 [ 22.697669][ T24] audit: type=1400 audit(1791462382.649:70): avc: denied { write } for pid=77 comm="syslogd" name="/" dev="tmpfs" ino=1 scontext=system_u:system_r:syslogd_t tcontext=system_u:object_r:tmpfs_t tclass=dir permissive=1 [ 22.727722][ T298] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026 [ 22.727736][ T298] RIP: 0010:pppol2tp_sock_to_session+0x167/0x1b0 [ 22.727751][ T298] Code: 5d c3 e8 ec 36 35 fd be 02 00 00 00 eb 0a e8 e0 36 35 fd be 01 00 00 00 4c 89 f7 e8 63 a6 0e fe e9 0f ff ff ff e8 c9 36 35 fd <0f> 0b 48 89 df e8 ef 00 00 00 eb bd e8 b8 36 35 fd 4c 89 f7 be 03 [ 22.738011][ T24] audit: type=1400 audit(1791462382.649:71): avc: denied { add_name } for pid=77 comm="syslogd" name="messages" scontext=system_u:system_r:syslogd_t tcontext=system_u:object_r:tmpfs_t tclass=dir permissive=1 [ 22.744150][ T298] RSP: 0018:ffffc90000b17c40 EFLAGS: 00010293 [ 22.763913][ T24] audit: type=1400 audit(1791462382.649:72): avc: denied { create } for pid=77 comm="syslogd" name="messages" scontext=system_u:system_r:syslogd_t tcontext=system_u:object_r:tmpfs_t tclass=file permissive=1 [ 22.784116][ T298] [ 22.790261][ T24] audit: type=1400 audit(1791462382.649:73): avc: denied { append open } for pid=77 comm="syslogd" path="/tmp/messages" dev="tmpfs" ino=5 scontext=system_u:system_r:syslogd_t tcontext=system_u:object_r:tmpfs_t tclass=file permissive=1 [ 22.810454][ T298] RAX: ffffffff842f81c7 RBX: ffff88810abf9000 RCX: ffff88810ad4bc00 [ 22.843468][ T298] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000000c04eb7d [ 22.851433][ T298] RBP: ffffc90000b17c60 R08: 0000000000000003 R09: 0000000000000004 [ 22.859407][ T298] R10: dffffc0000000000 R11: fffffbfff0dcf848 R12: dffffc0000000000 [ 22.867378][ T298] R13: dffffc0000000000 R14: 0000000000000000 R15: ffff88810ab47800 [ 22.875350][ T298] FS: 0000000000000000(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 [ 22.884268][ T298] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 22.890859][ T298] CR2: 00000000006aa5b0 CR3: 000000000640f000 CR4: 00000000003506a0 [ 22.898822][ T298] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 22.906801][ T298] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 22.914763][ T298] Call Trace: [ 22.918032][ T298] pppol2tp_release+0x150/0x2b0 [ 22.922883][ T298] sock_close+0xb8/0x200 [ 22.927108][ T298] ? sock_mmap+0xa0/0xa0 [ 22.931345][ T298] __fput+0x2dc/0x730 [ 22.935310][ T298] ____fput+0x15/0x20 [ 22.939266][ T298] task_work_run+0x127/0x190 [ 22.943852][ T298] do_exit+0xa7c/0x24e0 [ 22.947992][ T298] ? __kasan_check_write+0x14/0x20 [ 22.953139][ T298] ? switch_fpu_return+0x19c/0x330 [ 22.958237][ T298] ? put_task_struct+0x90/0x90 [ 22.963014][ T298] ? fpu__clear_all+0x20/0x20 [ 22.967673][ T298] ? __kasan_check_read+0x11/0x20 [ 22.972692][ T298] __x64_sys_exit+0x40/0x40 [ 22.977177][ T298] do_syscall_64+0x31/0x40 [ 22.981592][ T298] entry_SYSCALL_64_after_hwframe+0x61/0xcb [ 22.987466][ T298] RIP: 0033:0x7fda3ab8bd79 [ 22.991870][ T298] Code: Unable to access opcode bytes at RIP 0x7fda3ab8bd4f. [ 22.999217][ T298] RSP: 002b:00007ffeddd105c8 EFLAGS: 00000246 ORIG_RAX: 000000000000003c [ 23.007636][ T298] RAX: ffffffffffffffda RBX: 0000200000000040 RCX: 00007fda3ab8bd79 [ 23.015602][ T298] RDX: 00007fda3ab9d557 RSI: 0000000000000000 RDI: 0000000000000000 [ 23.023570][ T298] RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000023800000 [ 23.031535