ci2-android-6-1/strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ci2-android-6-1/syz-executor284757031
<...>
Warning: Permanently added '10.128.1.182' (ED25519) to the list of known hosts.
execve("ci2-android-6-1/syz-executor284757031", ["ci2-android-6-1/syz-executor284757031"], 0x7ffe4c526f40 /* 10 vars */) = 0
brk(NULL) = 0x555574117000
brk(0x555574117d40) = 0x555574117d40
arch_prctl(ARCH_SET_FS, 0x5555741173c0) = 0
set_tid_address(0x555574117690) = 306
set_robust_list(0x5555741176a0, 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-6-1/syz-executor284757031", 4096) = 43
getrandom("\x5f\x5f\xca\x64\xce\x2c\x58\xb3", 8, GRND_NONBLOCK) = 8
brk(NULL) = 0x555574117d40
brk(0x555574138d40) = 0x555574138d40
brk(0x555574139000) = 0x555574139000
mprotect(0x7f81b59e3000, 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
openat(AT_FDCWD, "/dev/net/tun", O_RDWR|O_TRUNC|O_NONBLOCK|O_NOFOLLOW) = 3
close(3) = 0
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\x23\xff\xff\xff\xff\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x00\x00\x00\x00\x00\x00\x02\x00\x00\x00\x00\x00\x00\x00"}, 46) = 0
executing program
ioctl(3, TUNSETIFF, 0) = -1 ENOTTY (Inappropriate ioctl for device)
ioctl(3, TUNSETDEBUG, 0xffffffffffffffff) = -1 ENOTTY (Inappropriate ioctl for device)
exit_group(0) = ?
[ 24.071099][ T28] audit: type=1400 audit(1786791588.555:64): avc: denied { execmem } for pid=306 comm="syz-executor284" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1
[ 24.091211][ T28] audit: type=1400 audit(1786791588.555:65): avc: denied { create } for pid=306 comm="syz-executor284" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=pppox_socket permissive=1
[ 24.091597][ T300] ==================================================================
[ 24.111725][ T28] audit: type=1400 audit(1786791588.555:66): avc: denied { connect } for pid=306 comm="syz-executor284" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=pppox_socket permissive=1
[ 24.119085][ T300] BUG: KASAN: use-after-free in l2tp_tunnel_del_work+0xd8/0x410
[ 24.139076][ T28] audit: type=1400 audit(1786791588.575:67): avc: denied { ioctl } for pid=306 comm="syz-executor284" path="socket:[15435]" dev="sockfs" ino=15435 ioctlcmd=0x54ca scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=pppox_socket permissive=1
[ 24.146565][ T300] Read of size 8 at addr ffff888110709c80 by task kworker/u4:3/300
[ 24.146583][ T300]
[ 24.146588][ T300] CPU: 1 PID: 300 Comm: kworker/u4:3 Not tainted syzkaller #0
[ 24.189485][ T300] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
[ 24.199540][ T300] Workqueue: l2tp l2tp_tunnel_del_work
[ 24.205008][ T300] Call Trace:
[ 24.208282][ T300]
[ 24.211213][ T300] __dump_stack+0x21/0x24
[ 24.215543][ T300] dump_stack_lvl+0x110/0x170
[ 24.220225][ T300] ? __cfi_dump_stack_lvl+0x8/0x8
[ 24.225249][ T300] ? __cfi__printk+0x8/0x8
[ 24.229660][ T300] ? __switch_to+0x56f/0x1070
[ 24.234350][ T300] ? l2tp_tunnel_del_work+0xd8/0x410
[ 24.239648][ T300] print_address_description+0x71/0x200
[ 24.245280][ T300] print_report+0x4a/0x60
[ 24.249606][ T300] kasan_report+0x122/0x150
[ 24.254110][ T300] ? l2tp_tunnel_del_work+0xd8/0x410
[ 24.259392][ T300] __asan_report_load8_noabort+0x14/0x20
[ 24.265022][ T300] l2tp_tunnel_del_work+0xd8/0x410
[ 24.270127][ T300] process_one_work+0x717/0xc30
[ 24.275060][ T300] worker_thread+0xa4d/0x11d0
[ 24.279741][ T300] kthread+0x281/0x320
[ 24.283808][ T300] ? __cfi_worker_thread+0x10/0x10
[ 24.288921][ T300] ? __cfi_kthread+0x10/0x10
[ 24.293505][ T300] ret_from_fork+0x1f/0x30
[ 24.297932][ T300]
[ 24.300945][ T300]
[ 24.303270][ T300] Allocated by task 306:
[ 24.307503][ T300] kasan_set_track+0x4b/0x70
[ 24.312090][ T300] kasan_save_alloc_info+0x1f/0x30
[ 24.317284][ T300] __kasan_kmalloc+0x95/0xb0
[ 24.321874][ T300] __kmalloc+0xb4/0x1e0
[ 24.326026][ T300] l2tp_session_create+0x38/0xbd0
[ 24.331044][ T300] pppol2tp_connect+0xbf5/0x1640
[ 24.336064][ T300] __sys_connect+0x3da/0x460
[ 24.340657][ T300] __x64_sys_connect+0x7a/0x90
[ 24.345419][ T300] x64_sys_call+0x88d/0x9a0
[ 24.349929][ T300] do_syscall_64+0x4c/0xa0
[ 24.354351][ T300] entry_SYSCALL_64_after_hwframe+0x68/0xd2
[ 24.360244][ T300]
[ 24.362561][ T300] Freed by task 306:
[ 24.366453][ T300] kasan_set_track+0x4b/0x70
[ 24.371041][ T300] kasan_save_free_info+0x2b/0x40
[ 24.376065][ T300] ____kasan_slab_free+0x132/0x180
[ 24.381260][ T300] __kasan_slab_free+0x11/0x20
[ 24.386023][ T300] slab_free_freelist_hook+0xc2/0x190
[ 24.391386][ T300] __kmem_cache_free+0xb7/0x1b0
[ 24.396235][ T300] kfree+0x6f/0xf0
[ 24.399948][ T300] l2tp_session_put+0xaf/0x1a0
[ 24.404708][ T300] pppol2tp_ioctl+0x748/0x960
[ 24.409384][ T300] pppox_ioctl+0x1f6/0x330
[ 24.413804][ T300] sock_do_ioctl+0x114/0x330
[ 24.418397][ T300] sock_ioctl+0x475/0x700
[ 24.422724][ T300] __se_sys_ioctl+0x12f/0x1b0
[ 24.427399][ T300] __x64_sys_ioctl+0x7b/0x90
[ 24.431983][ T300] x64_sys_call+0x58b/0x9a0
[ 24.436483][ T300] do_syscall_64+0x4c/0xa0
[ 24.440898][ T300] entry_SYSCALL_64_after_hwframe+0x68/0xd2
[ 24.446789][ T300]
[ 24.449106][ T300] The buggy address belongs to the object at ffff888110709c00
[ 24.449106][ T300] which belongs to the cache kmalloc-512 of size 512
[ 24.463149][ T300] The buggy address is located 128 bytes inside of
[ 24.463149][ T300] 512-byte region [ffff888110709c00, ffff888110709e00)
[ 24.476421][ T300]
[ 24.478745][ T300] The buggy address belongs to the physical page:
[ 24.485167][ T300] page:ffffea000441c200 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888110708400 pfn:0x110708
[ 24.496722][ T300] head:ffffea000441c200 order:2 compound_mapcount:0 compound_pincount:0
[ 24.505154][ T300] flags: 0x4000000000010200(slab|head|zone=1)
[ 24.511222][ T300] raw: 4000000000010200 0000000000000000 dead000000000001 ffff888100042f00
[ 24.519821][ T300] raw: ffff888110708400 000000008010000e 00000001ffffffff 0000000000000000
[ 24.528407][ T300] page dumped because: kasan: bad access detected
[ 24.534810][ T300] page_owner tracks the page as allocated
[ 24.540524][ T300] page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 91, tgid 91 (klogd), ts 4469542077, free_ts 0
[ 24.559973][ T300] post_alloc_hook+0x1f5/0x210
[ 24.564758][ T300] prep_new_page+0x1c/0x110
[ 24.569260][ T300] get_page_from_freelist+0x2ca9/0x2d20
[ 24.574807][ T300] __alloc_pages+0x1fa/0x610
[ 24.579400][ T300] alloc_slab_page+0x6e/0xf0
[ 24.583988][ T300] new_slab+0x98/0x3e0
[ 24.588142][ T300] ___slab_alloc+0x70f/0xb70
[ 24.592733][ T300] __slab_alloc+0x5e/0xa0
[ 24.597349][ T300] __kmem_cache_alloc_node+0x204/0x2d0
[ 24.602809][ T300] __kmalloc_node_track_caller+0xa1/0x1e0
[ 24.608550][ T300] __alloc_skb+0x226/0x4a0
[ 24.612959][ T300] alloc_skb_with_frags+0xa8/0x620
[ 24.618064][ T300] sock_alloc_send_pskb+0x87f/0x9a0
[ 24.623289][ T300] unix_dgram_sendmsg+0x5c1/0x1710
[ 24.628581][ T300] __sys_sendto+0x4ac/0x660
[ 24.633079][ T300] __x64_sys_sendto+0xe5/0x100
[ 24.637947][ T300] page_owner free stack trace missing
[ 24.643305][ T300]
[ 24.645622][ T300] Memory state around the buggy address:
[ 24.651247][ T300] ffff888110709b80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[ 24.659301][ T300] ffff888110709c00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 24.667443][ T300] >ffff888110709c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 24.675502][ T300] ^
[ 24.679580][ T300] ffff888110709d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 24.687648][ T300] ffff888110709d80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 24.695700][ T300] ==================================================================
[ 24.703791][ T300] Disabling lock debugging due to kernel taint
[ 24.710234][ T306] ------------[ cut here ]------------
[ 24.715827][ T306] WARNING: CPU: 0 PID: 306 at net/l2tp/l2tp_ppp.c:156 pppol2tp_sock_to_session+0x167/0x1b0
[ 24.725940][ T306] Modules linked in:
[ 24.729851][ T306] CPU: 0 PID: 306 Comm: syz-executor284 Tainted: G B syzkaller #0
[ 24.730041][ T28] audit: type=1400 audit(1786791589.205:68): avc: denied { read } for pid=84 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
[ 24.739083][ T306] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
[ 24.739095][ T306] RIP: 0010:pppol2tp_sock_to_session+0x167/0x1b0
[ 24.761014][ T28] audit: type=1400 audit(1786791589.205:69): avc: denied { search } for pid=84 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
[ 24.771437][ T306] Code: 5d c3 e8 5c b3 d5 fc be 02 00 00 00 eb 0a e8 50 b3 d5 fc be 01 00 00 00 4c 89 f7 e8 23 18 cd fd e9 0f ff ff ff e8 39 b3 d5 fc <0f> 0b 48 89 df e8 ff 00 00 00 eb bd e8 28 b3 d5 fc 4c 89 f7 be 03
[ 24.777944][ T28] audit: type=1400 audit(1786791589.205:70): avc: denied { write } for pid=84 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
[ 24.799092][ T306] RSP: 0018:ffffc90000e57b30 EFLAGS: 00010293
[ 24.818706][ T28] audit: type=1400 audit(1786791589.205:71): avc: denied { add_name } for pid=84 comm="syslogd" name="messages" scontext=system_u:system_r:syslogd_t tcontext=system_u:object_r:tmpfs_t tclass=dir permissive=1
[ 24.839786][ T306]
[ 24.845866][ T28] audit: type=1400 audit(1786791589.205:72): avc: denied { create } for pid=84 comm="syslogd" name="messages" scontext=system_u:system_r:syslogd_t tcontext=system_u:object_r:tmpfs_t tclass=file permissive=1
[ 24.866244][ T306] RAX: ffffffff849bb307 RBX: ffff88810959e000 RCX: ffff88811f579440
[ 24.868582][ T28] audit: type=1400 audit(1786791589.205:73): avc: denied { append open } for pid=84 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
[ 24.888888][ T306] RDX: 0000000000000000 RSI: 00000000109af540 RDI: 000000000c04eb7d
[ 24.927556][ T306] RBP: ffffc90000e57b50 R08: ffff88810959e083 R09: 1ffff110212b3c10
[ 24.935539][ T306] R10: dffffc0000000000 R11: ffffed10212b3c11 R12: dffffc0000000000
[ 24.943540][ T306] R13: dffffc0000000000 R14: 00000000109af540 R15: ffff888110709c00
[ 24.951544][ T306] FS: 0000000000000000(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
[ 24.960510][ T306] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 24.967083][ T306] CR2: 000055d0d0588308 CR3: 000000000700f000 CR4: 00000000003506b0
[ 24.975158][ T306] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 24.983163][ T306] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 24.991254][ T306] Call Trace:
[ 24.994536][ T306]
[ 24.997538][ T306] pppol2tp_release+0x150/0x2b0
[ 25.002395][ T306] sock_close+0xc9/0x220
[ 25.006650][ T306] ? __cfi_sock_close+0x10/0x10
[ 25.011597][ T306] __fput+0x1fd/0x8f0
[ 25.015586][ T306] ____fput+0x15/0x20
[ 25.019557][ T306] task_work_run+0x1e1/0x250
[ 25.024175][ T306] ? __cfi_task_work_run+0x10/0x10
[ 25.029319][ T306] ? __kasan_check_write+0x14/0x20
[ 25.034490][ T306] do_exit+0xaf2/0x2850
[ 25.038672][ T306] ? ptrace_stop+0x6dc/0x8e0
[ 25.043325][ T306] ? __cfi_do_exit+0x10/0x10
[ 25.048035][ T306] ? __kasan_check_write+0x14/0x20
[ 25.053211][ T306] ? _raw_spin_lock_irq+0x95/0xf0
[ 25.058254][ T306] ? __cfi__raw_spin_lock_irq+0x10/0x10
[ 25.063862][ T306] ? zap_other_threads+0x2c1/0x2f0
[ 25.069007][ T306] do_group_exit+0x21b/0x2e0
[ 25.073669][ T306] __x64_sys_exit_group+0x3f/0x40
[ 25.078717][ T306] x64_sys_call+0x7b4/0x9a0
[ 25.083283][ T306] do_syscall_64+0x4c/0xa0
[ 25.087810][ T306] ? clear_bhb_loop+0x30/0x80
[ 25.092553][ T306] ? clear_bhb_loop+0x30/0x80
[ 25.097331][ T306] entry_SYSCALL_64_after_hwframe+0x68/0xd2
[ 25.103302][ T306] RIP: 0033:0x7f81b5952385
[ 25.107739][ T306] Code: Unable to access opcode bytes at 0x7f81b595235b.
[ 25.114791][ T306] RSP: 002b:00007fff7b0111f8 EFLAGS: 00000202 ORIG_RAX: 00000000000000e7
+++ exited with 0 +++
[ 25.123404][ T306] RAX