ci2-android-5-15/strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ci2-android-5-15/syz-executor843239639
<...>
tclass=process permissive=1
[ 13.693982][ T30] audit: type=1400 audit(1785977025.384:63): avc: denied { siginh } for pid=223 comm="sh" scontext=system_u:system_r:sshd_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1
Warning: Permanently added '10.128.0.108' (ED25519) to the list of known hosts.
execve("ci2-android-5-15/syz-executor843239639", ["ci2-android-5-15/syz-executor843239639"], 0x7fff4836e170 /* 10 vars */) = 0
brk(NULL) = 0x55555769b000
brk(0x55555769bd40) = 0x55555769bd40
arch_prctl(ARCH_SET_FS, 0x55555769b3c0) = 0
set_tid_address(0x55555769b690) = 303
set_robust_list(0x55555769b6a0, 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-5-15/syz-executor843239639", 4096) = 44
getrandom("\x7a\x69\xfd\x3c\xf2\x8e\x86\x13", 8, GRND_NONBLOCK) = 8
brk(NULL) = 0x55555769bd40
brk(0x5555576bcd40) = 0x5555576bcd40
brk(0x5555576bd000) = 0x5555576bd000
mprotect(0x7f76031ae000, 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) = 304
ioctl(3, PPPIOCSFLAGS, 0) = -1 ENOSYS (Function not implemented)
exit_group(0) = ?
+++ exited with 0 +++
[ 23.208641][ T30] audit: type=1400 audit(1785977034.924:64): avc: denied { execmem } for pid=303 comm="syz-executor843" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1
[ 23.228509][ T30] audit: type=1400 audit(1785977034.934:65): avc: denied { create } for pid=303 comm="syz-executor843" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=pppox_socket permissive=1
[ 23.249498][ T30] audit: type=1400 audit(1785977034.934:66): avc: denied { connect } for pid=303 comm="syz-executor843" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=pppox_socket permissive=1
[ 23.269575][ T30] audit: type=1400 audit(1785977034.944:67): avc: denied { ioctl } for pid=303 comm="syz-executor843" path="socket:[576]" dev="sockfs" ino=576 ioctlcmd=0x7459 scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=pppox_socket permissive=1
[ 23.399482][ T304] ==================================================================
[ 23.407764][ T304] BUG: KASAN: use-after-free in pppol2tp_sock_to_session+0x1a0/0x1b0
[ 23.415829][ T304] Read of size 4 at addr ffff888123b78c00 by task syz-executor843/304
[ 23.423955][ T304]
[ 23.426283][ T304] CPU: 0 PID: 304 Comm: syz-executor843 Not tainted syzkaller #0
[ 23.433987][ T304] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
[ 23.444138][ T304] Call Trace:
[ 23.447398][ T304]
[ 23.450307][ T304] __dump_stack+0x21/0x30
[ 23.454629][ T304] dump_stack_lvl+0x110/0x170
[ 23.459289][ T304] ? show_regs_print_info+0x20/0x20
[ 23.464856][ T304] ? load_image+0x3f0/0x3f0
[ 23.469462][ T304] ? __local_bh_enable_ip+0x58/0x80
[ 23.474653][ T304] print_address_description+0x7f/0x2c0
[ 23.480182][ T304] ? pppol2tp_sock_to_session+0x1a0/0x1b0
[ 23.485911][ T304] kasan_report+0x10f/0x150
[ 23.490393][ T304] ? pppol2tp_sock_to_session+0x1a0/0x1b0
[ 23.496106][ T304] __asan_report_load4_noabort+0x14/0x20
[ 23.501716][ T304] pppol2tp_sock_to_session+0x1a0/0x1b0
[ 23.507260][ T304] pppol2tp_release+0x150/0x2b0
[ 23.512101][ T304] sock_close+0xb8/0x200
[ 23.516754][ T304] ? sock_mmap+0xa0/0xa0
[ 23.520982][ T304] __fput+0x22b/0x900
[ 23.524940][ T304] ____fput+0x15/0x20
[ 23.528894][ T304] task_work_run+0x127/0x190
[ 23.533557][ T304] do_exit+0xb70/0x29a0
[ 23.537700][ T304] ? __se_sys_clock_nanosleep+0x30b/0x3a0
[ 23.543401][ T304] ? put_task_struct+0x90/0x90
[ 23.548166][ T304] ? __kasan_check_write+0x14/0x20
[ 23.553264][ T304] __x64_sys_exit+0x40/0x40
[ 23.557762][ T304] x64_sys_call+0x44/0x9a0
[ 23.562161][ T304] do_syscall_64+0x4c/0xa0
[ 23.566558][ T304] ? clear_bhb_loop+0x50/0xa0
[ 23.571215][ T304] ? clear_bhb_loop+0x50/0xa0
[ 23.575879][ T304] entry_SYSCALL_64_after_hwframe+0x66/0xd0
[ 23.581750][ T304] RIP: 0033:0x7f760311dd79
[ 23.586146][ T304] Code: Unable to access opcode bytes at RIP 0x7f760311dd4f.
[ 23.593505][ T304] RSP: 002b:00007ffe353c7c58 EFLAGS: 00000246 ORIG_RAX: 000000000000003c
[ 23.601914][ T304] RAX: ffffffffffffffda RBX: 0000200000000040 RCX: 00007f760311dd79
[ 23.610067][ T304] RDX: 00007f760312f557 RSI: 0000000000000000 RDI: 0000000000000000
[ 23.618021][ T304] RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000023800000
[ 23.625970][ T304] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffe353c7e78
[ 23.633936][ T304] R13: 0000000000000002 R14: 00007f76031aeca0 R15: 0000000000000002
[ 23.641891][ T304]
[ 23.644901][ T304]
[ 23.647199][ T304] Allocated by task 303:
[ 23.651408][ T304] __kasan_kmalloc+0xd4/0x100
[ 23.656061][ T304] __kmalloc+0x13d/0x2c0
[ 23.660276][ T304] l2tp_session_create+0x39/0xb60
[ 23.665280][ T304] pppol2tp_connect+0xbf5/0x1640
[ 23.670192][ T304] __sys_connect+0x3cb/0x450
[ 23.674755][ T304] __x64_sys_connect+0x7a/0x90
[ 23.679514][ T304] x64_sys_call+0x7c/0x9a0
[ 23.683906][ T304] do_syscall_64+0x4c/0xa0
[ 23.688295][ T304] entry_SYSCALL_64_after_hwframe+0x66/0xd0
[ 23.694169][ T304]
[ 23.696466][ T304] Freed by task 10:
[ 23.700240][ T304] kasan_set_track+0x4a/0x70
[ 23.704814][ T304] kasan_set_free_info+0x23/0x40
[ 23.709724][ T304] ____kasan_slab_free+0x125/0x160
[ 23.714806][ T304] __kasan_slab_free+0x11/0x20
[ 23.719541][ T304] slab_free_freelist_hook+0xc2/0x190
[ 23.724887][ T304] kfree+0xc4/0x270
[ 23.728672][ T304] l2tp_session_put+0xaf/0x1a0
[ 23.733427][ T304] l2tp_session_delete+0x3a9/0x4a0
[ 23.738530][ T304] l2tp_tunnel_del_work+0x180/0x3d0
[ 23.743700][ T304] process_one_work+0x6c8/0xbb0
[ 23.748531][ T304] worker_thread+0xaa0/0x1250
[ 23.753188][ T304] kthread+0x3f5/0x4f0
[ 23.757244][ T304] ret_from_fork+0x1f/0x30
[ 23.761637][ T304]
[ 23.763946][ T304] The buggy address belongs to the object at ffff888123b78c00
[ 23.763946][ T304] which belongs to the cache kmalloc-512 of size 512
[ 23.777982][ T304] The buggy address is located 0 bytes inside of
[ 23.777982][ T304] 512-byte region [ffff888123b78c00, ffff888123b78e00)
[ 23.791053][ T304] The buggy address belongs to the page:
[ 23.796666][ T304] page:ffffea00048ede00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x123b78
[ 23.806889][ T304] head:ffffea00048ede00 order:2 compound_mapcount:0 compound_pincount:0
[ 23.815183][ T304] flags: 0x4000000000010200(slab|head|zone=1)
[ 23.821227][ T304] raw: 4000000000010200 0000000000000000 dead000000000122 ffff888100042f00
[ 23.829804][ T304] raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000
[ 23.838373][ T304] page dumped because: kasan: bad access detected
[ 23.844783][ T304] page_owner tracks the page as allocated
[ 23.850478][ T304] page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 299, ts 23088605455, free_ts 0
[ 23.868601][ T304] post_alloc_hook+0x192/0x1b0
[ 23.873345][ T304] prep_new_page+0x1c/0x110
[ 23.877822][ T304] get_page_from_freelist+0x2c3a/0x2cd0
[ 23.883339][ T304] __alloc_pages+0x1a2/0x460
[ 23.887903][ T304] new_slab+0xa0/0x4d0
[ 23.891957][ T304] ___slab_alloc+0x3ac/0x840
[ 23.896533][ T304] __slab_alloc+0x49/0x90
[ 23.900847][ T304] __kmalloc_track_caller+0x169/0x2c0
[ 23.906191][ T304] __alloc_skb+0x210/0x730
[ 23.910580][ T304] alloc_skb_with_frags+0xa8/0x620
[ 23.915667][ T304] sock_alloc_send_pskb+0x87f/0x9a0
[ 23.920835][ T304] unix_stream_sendmsg+0x428/0xc90
[ 23.925938][ T304] sock_write_iter+0x2a6/0x3a0
[ 23.930678][ T304] vfs_write+0x831/0xfd0
[ 23.934897][ T304] ksys_write+0x14a/0x260
[ 23.939197][ T304] __x64_sys_write+0x7b/0x90
[ 23.943764][ T304] page_owner free stack trace missing
[ 23.949113][ T304]
[ 23.951420][ T304] Memory state around the buggy address:
[ 23.957027][ T304] ffff888123b78b00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[ 23.965075][ T304] ffff888123b78b80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[ 23.973133][ T304] >ffff888123b78c00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 23.981177][ T304] ^
[ 23.985218][ T304] ffff888123b78c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 23.993253][ T304] ffff888123b78d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 24.001283][ T304] ==================================================================
[ 24.009410][ T304] Disabling lock debugging due to kernel taint
[ 24.015868][ T304] ------------[ cut here ]------------
[ 24.021360][ T304] WARNING: CPU: 0 PID: 304 at net/l2tp/l2tp_ppp.c:156 pppol2tp_sock_to_session+0x167/0x1b0
[ 24.025970][ T30] audit: type=1400 audit(1785977035.734:68): avc: denied { read } for pid=83 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
[ 24.031398][ T304] Modules linked in:
[ 24.053246][ T30] audit: type=1400 audit(1785977035.734:69): avc: denied { search } for pid=83 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
[ 24.057017][ T304] CPU: 0 PID: 304 Comm: syz-executor843 Tainted: G B syzkaller #0
[ 24.078580][ T30] audit: type=1400 audit(1785977035.734:70): avc: denied { write } for pid=83 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
[ 24.087526][ T304] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
[ 24.108827][ T30] audit: type=1400 audit(1785977035.734:71): avc: denied { add_name } for pid=83 comm="syslogd" name="messages" scontext=system_u:system_r:syslogd_t tcontext=system_u:object_r:tmpfs_t tclass=dir permissive=1
[ 24.118678][ T304] RIP: 0010:pppol2tp_sock_to_session+0x167/0x1b0
[ 24.139362][ T30] audit: type=1400 audit(1785977035.734:72): avc: denied { create } for pid=83 comm="syslogd" name="messages" scontext=system_u:system_r:syslogd_t tcontext=system_u:object_r:tmpfs_t tclass=file permissive=1
[ 24.145448][ T304] Code: 5d c3 e8 9c 83 0b fd be 02 00 00 00 eb 0a e8 90 83 0b fd be 01 00 00 00 4c 89 f7 e8 33 02 f2 fd e9 0f ff ff ff e8 79 83 0b fd <0f> 0b 48 89 df e8 ef 00 00 00 eb bd e8 68 83 0b fd 4c 89 f7 be 03
[ 24.165937][ T30] audit: type=1400 audit(1785977035.734:73): avc: denied { append open } for pid=83 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
[ 24.185621][ T304] RSP: 0018:ffffc900007b7bf0 EFLAGS: 00010293
[ 24.214490][ T304] RAX: ffffffff845e3367 RBX: ffff888107fbc000 RCX: ffff88810973e2c0
[ 24.222591][ T304] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000000c04eb7d
[ 24.230616][ T304] RBP: ffffc900007b7c10 R08: 0000000000000003 R09: 0000000000000004
[ 24.238713][ T304] R10: dffffc0000000000 R11: fffffbfff0e18e4c R12: dffffc0000000000
[ 24.246716][ T304] R13: dffffc0000000000 R14: 0000000000000000 R15: ffff888123b78c00
[ 24.254738][ T304] FS: 0000000000000000(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
[ 24.263776][ T304] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 24.270365][ T304] CR2: 00007f760312f4f0 CR3: 000000000660f000 CR4: 00000000003506b0
[ 24.278352][ T304] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 24.286304][ T304] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 24.294301][ T304] Call Trace:
[ 24.297583][ T304]
[ 24.300495][ T304] pppol2tp_release+0x150/0x2b0
[ 24.305338][ T304] sock_close+0xb8/0x200
[ 24.309625][ T304] ? sock_mmap+0xa0/0xa0
[ 24.313862][ T304] __fput+0x22b/0x900
[ 24.317853][ T304] ____fput+0x15/0x20
[ 24.321832][ T304] task_work_run+0x127/0x190
[ 24.326400][ T304] do_exit+0xb70/0x29a0
[ 24.330565][ T304] ? __se_sys_clock_nanosleep+0x30b/0x3a0
[ 24.336370][ T304] ? put_task_struct+0x90/0x90
[ 24.341189][ T304] ? __kasan_check_write+0x14/0x20
[ 24.346330][ T304] __x64_sys_exit+0x40/0x40
[ 24.350868][ T304] x64_sys_call+0x44/0x9a0
[ 24.355282][ T304] do_syscall_64+0x4c/0xa0
[ 24.359820][ T304] ? clear_bhb_loop+0x50/0xa0
[ 24.364493][ T304] ? clear_bhb_loop+0x50/0xa0
[ 24.369195][ T304] entry_SYSCALL_64_after_hwframe+0x66/0xd0
[ 24.375168][ T304] RIP: 0033:0x7f760311dd79
[ 24.379587][ T304] Code: Unable to access opcode bytes at RIP 0x7f760311dd4f.
[ 24.387026][ T304] RSP: 002b:00007ffe353c7c58 EFLAGS: 00000246 ORIG_RAX: 000000000000003c
[ 24.395463][ T304] RAX: ffffffffffffffda RBX: 0000200000000040 RCX: 00007f760311dd79
[ 2