syzkaller syzkaller login: [ 14.085441][ T24] kauditd_printk_skb: 48 callbacks suppressed [ 14.085450][ T24] audit: type=1400 audit(1782720712.040:59): avc: denied { transition } for pid=217 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 [ 14.090668][ T24] audit: type=1400 audit(1782720712.040:60): avc: denied { noatsecure } for pid=217 comm="sshd-session" scontext=system_u:system_r:sshd_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1 [ 14.094056][ T24] audit: type=1400 audit(1782720712.040:61): avc: denied { write } for pid=217 comm="sh" path="pipe:[968]" dev="pipefs" ino=968 scontext=root:sysadm_r:sysadm_t tcontext=system_u:system_r:sshd_t tclass=fifo_file permissive=1 [ 14.097578][ T24] audit: type=1400 audit(1782720712.040:62): avc: denied { rlimitinh } for pid=217 comm="sh" scontext=system_u:system_r:sshd_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1 [ 14.101143][ T24] audit: type=1400 audit(1782720712.040:63): avc: denied { siginh } for pid=217 comm="sh" scontext=system_u:system_r:sshd_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1 Warning: Permanently added '10.128.0.183' (ED25519) to the list of known hosts. 2026/06/29 08:12:01 parsed 1 programs 2026/06/29 08:12:01 serving rpc on tcp://33109 [ 23.224870][ T24] audit: type=1400 audit(1782720721.180:64): avc: denied { node_bind } for pid=287 comm="syz-execprog" saddr=::1 scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:node_t tclass=tcp_socket permissive=1 [ 23.245620][ T24] audit: type=1400 audit(1782720721.180:65): avc: denied { create } for pid=287 comm="syz-execprog" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=rawip_socket permissive=1 [ 23.265221][ T24] audit: type=1400 audit(1782720721.180:66): avc: denied { module_request } for pid=287 comm="syz-execprog" kmod="net-pf-2-proto-262-type-1" scontext=root:sysadm_r:sysadm_t tcontext=system_u:system_r:kernel_t tclass=system permissive=1 [ 23.826241][ T24] audit: type=1400 audit(1782720721.780:67): avc: denied { mounton } for pid=293 comm="syz-executor" path="/syzcgroup/unified" dev="sda1" ino=2024 scontext=root:sysadm_r:sysadm_t tcontext=root:object_r:root_t tclass=dir permissive=1 [ 23.827279][ T293] cgroup: Unknown subsys name 'net' [ 23.848931][ T24] audit: type=1400 audit(1782720721.780:68): avc: denied { mount } for pid=293 comm="syz-executor" name="/" dev="cgroup2" ino=1 scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:cgroup_t tclass=filesystem permissive=1 [ 23.876185][ T24] audit: type=1400 audit(1782720721.810:69): avc: denied { unmount } for pid=293 comm="syz-executor" scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:cgroup_t tclass=filesystem permissive=1 [ 23.876348][ T293] cgroup: Unknown subsys name 'devices' [ 23.991755][ T293] cgroup: Unknown subsys name 'hugetlb' [ 23.997472][ T293] cgroup: Unknown subsys name 'rlimit' [ 24.139562][ T24] audit: type=1400 audit(1782720722.090:70): avc: denied { setattr } for pid=293 comm="syz-executor" name="raw-gadget" dev="devtmpfs" ino=253 scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:device_t tclass=chr_file permissive=1 [ 24.162749][ T24] audit: type=1400 audit(1782720722.090:71): avc: denied { create } for pid=293 comm="syz-executor" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=netlink_generic_socket permissive=1 Setting up swapspace version 1, size = 127995904 bytes [ 24.183142][ T24] audit: type=1400 audit(1782720722.090:72): avc: denied { write } for pid=293 comm="syz-executor" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=netlink_generic_socket permissive=1 [ 24.188730][ T297] SELinux: Context root:object_r:swapfile_t is not valid (left unmapped). [ 24.204129][ T24] audit: type=1400 audit(1782720722.100:73): avc: denied { read } for pid=293 comm="syz-executor" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=netlink_generic_socket permissive=1 [ 24.246332][ T293] Adding 124996k swap on ./swap-file. Priority:0 extents:1 across:124996k [ 24.663179][ T302] request_module fs-gadgetfs succeeded, but still no fs? [ 24.673264][ T302] cgroup: cgroup: disabling cgroup2 socket matching due to net_prio or net_cls activation [ 24.881624][ T325] bridge0: port 1(bridge_slave_0) entered blocking state [ 24.888671][ T325] bridge0: port 1(bridge_slave_0) entered disabled state [ 24.896115][ T325] device bridge_slave_0 entered promiscuous mode [ 24.903122][ T325] bridge0: port 2(bridge_slave_1) entered blocking state [ 24.910304][ T325] bridge0: port 2(bridge_slave_1) entered disabled state [ 24.917589][ T325] device bridge_slave_1 entered promiscuous mode [ 24.948799][ T325] bridge0: port 2(bridge_slave_1) entered blocking state [ 24.955858][ T325] bridge0: port 2(bridge_slave_1) entered forwarding state [ 24.963156][ T325] bridge0: port 1(bridge_slave_0) entered blocking state [ 24.970300][ T325] bridge0: port 1(bridge_slave_0) entered forwarding state [ 24.987146][ T9] bridge0: port 1(bridge_slave_0) entered disabled state [ 24.994602][ T9] bridge0: port 2(bridge_slave_1) entered disabled state [ 25.002303][ T9] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready [ 25.009825][ T9] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 25.018461][ T9] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 25.026997][ T9] bridge0: port 1(bridge_slave_0) entered blocking state [ 25.034047][ T9] bridge0: port 1(bridge_slave_0) entered forwarding state [ 25.043239][ T9] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 25.051419][ T9] bridge0: port 2(bridge_slave_1) entered blocking state [ 25.058425][ T9] bridge0: port 2(bridge_slave_1) entered forwarding state [ 25.069852][ T9] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 25.079490][ T9] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 25.092908][ T9] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready [ 25.103349][ T9] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready [ 25.111536][ T9] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready [ 25.118918][ T9] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready [ 25.127081][ T325] device veth0_vlan entered promiscuous mode [ 25.137758][ T9] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready [ 25.147110][ T325] device veth1_macvtap entered promiscuous mode [ 25.156806][ T9] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready [ 25.166804][ T9] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready 2026/06/29 08:12:03 executed programs: 0 [ 25.707362][ T365] bridge0: port 1(bridge_slave_0) entered blocking state [ 25.714531][ T365] bridge0: port 1(bridge_slave_0) entered disabled state [ 25.722141][ T365] device bridge_slave_0 entered promiscuous mode [ 25.728970][ T365] bridge0: port 2(bridge_slave_1) entered blocking state [ 25.736020][ T365] bridge0: port 2(bridge_slave_1) entered disabled state [ 25.743369][ T365] device bridge_slave_1 entered promiscuous mode [ 25.776053][ T365] bridge0: port 2(bridge_slave_1) entered blocking state [ 25.783110][ T365] bridge0: port 2(bridge_slave_1) entered forwarding state [ 25.790368][ T365] bridge0: port 1(bridge_slave_0) entered blocking state [ 25.797384][ T365] bridge0: port 1(bridge_slave_0) entered forwarding state [ 25.812903][ T9] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 25.821037][ T9] bridge0: port 1(bridge_slave_0) entered disabled state [ 25.828172][ T9] bridge0: port 2(bridge_slave_1) entered disabled state [ 25.840291][ T9] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 25.848439][ T9] bridge0: port 1(bridge_slave_0) entered blocking state [ 25.855516][ T9] bridge0: port 1(bridge_slave_0) entered forwarding state [ 25.864183][ T9] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 25.872370][ T9] bridge0: port 2(bridge_slave_1) entered blocking state [ 25.879380][ T9] bridge0: port 2(bridge_slave_1) entered forwarding state [ 25.889832][ T9] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_hsr: link becomes ready [ 25.898068][ T9] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 25.911939][ T9] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_hsr: link becomes ready [ 25.920006][ T9] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 25.933699][ T365] device veth0_vlan entered promiscuous mode [ 25.940008][ T9] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_virt_wifi: link becomes ready [ 25.948540][ T9] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready [ 25.957398][ T9] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_vlan: link becomes ready [ 25.965427][ T9] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready [ 25.978986][ T365] device veth1_macvtap entered promiscuous mode [ 25.987312][ T9] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready [ 25.994833][ T9] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready [ 26.002649][ T9] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_macvtap: link becomes ready [ 26.011156][ T9] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready [ 26.019398][ T9] IPv6: ADDRCONF(NETDEV_CHANGE): macsec0: link becomes ready [ 26.028927][ T9] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_0: link becomes ready [ 26.037248][ T9] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready [ 26.049414][ T9] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready [ 26.057783][ T9] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready [ 26.076993][ T385] ================================================================== [ 26.085125][ T385] BUG: KASAN: use-after-free in mutex_lock+0x85/0xf0 [ 26.091801][ T385] Write of size 8 at addr ffff888121341950 by task syz.2.17/385 [ 26.099431][ T385] [ 26.101760][ T385] CPU: 1 PID: 385 Comm: syz.2.17 Not tainted syzkaller #0 [ 26.109061][ T385] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 [ 26.119096][ T385] Call Trace: [ 26.122394][ T385] __dump_stack+0x21/0x24 [ 26.126704][ T385] dump_stack_lvl+0x1a7/0x208 [ 26.131377][ T385] ? show_regs_print_info+0x18/0x18 [ 26.136555][ T385] ? thaw_kernel_threads+0x220/0x220 [ 26.141846][ T385] ? debug_smp_processor_id+0x17/0x20 [ 26.147485][ T385] print_address_description+0x7f/0x2c0 [ 26.153023][ T385] ? mutex_lock+0x85/0xf0 [ 26.157332][ T385] kasan_report+0x100/0x140 [ 26.161959][ T385] ? mutex_lock+0x85/0xf0 [ 26.166275][ T385] kasan_check_range+0x249/0x2a0 [ 26.171216][ T385] __kasan_check_write+0x14/0x20 [ 26.176155][ T385] mutex_lock+0x85/0xf0 [ 26.180396][ T385] ? mutex_trylock+0xb0/0xb0 [ 26.184978][ T385] ? l2tp_session_put+0xb2/0x1a0 [ 26.189892][ T385] ? l2tp_session_delete+0x3a9/0x4a0 [ 26.195161][ T385] pppol2tp_release+0x178/0x2b0 [ 26.199993][ T385] sock_close+0xb8/0x200 [ 26.204214][ T385] ? sock_mmap+0xa0/0xa0 [ 26.208441][ T385] __fput+0x2dc/0x730 [ 26.212403][ T385] ____fput+0x15/0x20 [ 26.216361][ T385] task_work_run+0x127/0x190 [ 26.220972][ T385] exit_to_user_mode_loop+0xcb/0xe0 [ 26.226161][ T385] exit_to_user_mode_prepare+0x76/0xa0 [ 26.231639][ T385] syscall_exit_to_user_mode+0x1d/0x40 [ 26.237099][ T385] do_syscall_64+0x3d/0x40 [ 26.241501][ T385] entry_SYSCALL_64_after_hwframe+0x61/0xcb [ 26.247373][ T385] RIP: 0033:0x7fb8d2871e59 [ 26.251770][ T385] Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 [ 26.271359][ T385] RSP: 002b:00007ffd25da1168 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4 [ 26.279755][ T385] RAX: 0000000000000000 RBX: 00007ffd25da1250 RCX: 00007fb8d2871e59 [ 26.287888][ T385] RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003 [ 26.295858][ T385] RBP: 00000000000065d1 R08: 0000000000000001 R09: 0000000000000000 [ 26.303817][ T385] R10: 0000001b32c20000 R11: 0000000000000246 R12: 0000000000000000 [ 26.311775][ T385] R13: 00007fb8d2aeafac R14: 00007fb8d2aeafa8 R15: 00007fb8d2aeafa0 [ 26.319733][ T385] [ 26.322042][ T385] Allocated by task 385: [ 26.326268][ T385] __kasan_kmalloc+0xd4/0x100 [ 26.330930][ T385] __kmalloc+0x19f/0x330 [ 26.335154][ T385] l2tp_session_create+0x39/0xb60 [ 26.340157][ T385] pppol2tp_connect+0xbf5/0x1640 [ 26.345085][ T385] __sys_connect+0x3ce/0x450 [ 26.349654][ T385] __x64_sys_connect+0x7a/0x90 [ 26.354398][ T385] do_syscall_64+0x31/0x40 [ 26.358790][ T385] entry_SYSCALL_64_after_hwframe+0x61/0xcb [ 26.364655][ T385] [ 26.366968][ T385] Freed by task 385: [ 26.370874][ T385] kasan_set_track+0x4a/0x70 [ 26.375443][ T385] kasan_set_free_info+0x23/0x40 [ 26.380361][ T385] ____kasan_slab_free+0x125/0x160 [ 26.385456][ T385] __kasan_slab_free+0x11/0x20 [ 26.390206][ T385] slab_free_freelist_hook+0xc5/0x190 [ 26.395556][ T385] kfree+0xc0/0x270 [ 26.399339][ T385] l2tp_session_put+0xb2/0x1a0 [ 26.404123][ T385] l2tp_session_delete+0x3a9/0x4a0 [ 26.409215][ T385] pppol2tp_release+0x169/0x2b0 [ 26.414046][ T385] sock_close+0xb8/0x200 [ 26.418275][ T385] __fput+0x2dc/0x730 [ 26.422236][ T385] ____fput+0x15/0x20 [ 26.426198][ T385] task_work_run+0x127/0x190 [ 26.430763][ T385] exit_to_user_mode_loop+0xcb/0xe0 [ 26.435942][ T385] exit_to_user_mode_prepare+0x76/0xa0 [ 26.441386][ T385] syscall_exit_to_user_mode+0x1d/0x40 [ 26.446818][ T385] do_syscall_64+0x3d/0x40 [ 26.451213][ T385] entry_SYSCALL_64_after_hwframe+0x61/0xcb [ 26.457079][ T385] [ 26.459543][ T385] The buggy address belongs to the object at ffff888121341800 [ 26.459543][ T385] which belongs to the cache kmalloc-512 of size 512 [ 26.473692][ T385] The buggy address is located 336 bytes inside of [ 26.473692][ T385] 512-byte region [ffff888121341800, ffff888121341a00) [ 26.486973][ T385] The buggy address belongs to the page: [ 26.492616][ T385] page:ffffea000484d000 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x121340 [ 26.502828][ T385] head:ffffea000484d000 order:2 compound_mapcount:0 compound_pincount:0 [ 26.511137][ T385] flags: 0x4000000000010200(slab|head) [ 26.516587][ T385] raw: 4000000000010200 dead000000000100 dead000000000122 ffff888100043080 [ 26.525159][ T385] raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000 [ 26.533725][ T385] page dumped because: kasan: bad access detected [ 26.540116][ T385] page_owner tracks the page as allocated [ 26.545820][ T385] page last allocated via order 2, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 365, ts 26068841876, free_ts 26068138392 [ 26.566193][ T385] prep_new_page+0x176/0x190 [ 26.570763][ T385] get_page_from_freelist+0x225f/0x23f0 [ 26.576288][ T385] __alloc_pages_nodemask+0x29a/0x640 [ 26.581644][ T385] new_slab+0x84/0x3f0 [ 26.585688][ T385] ___slab_alloc+0x2f8/0x4c0 [ 26.590255][ T385] __slab_alloc+0x63/0xa0 [ 26.594562][ T385] __kmalloc+0x1f9/0x330 [ 26.598788][ T385] fib6_info_alloc+0x34/0xe0 [ 26.603355][ T385] ip6_route_info_create+0x4c7/0x1450 [ 26.608731][ T385] ip6_route_add+0x27/0x130 [ 26.613242][ T385] addrconf_add_dev+0x385/0x4c0 [ 26.618072][ T385] addrconf_dev_config+0x1c3/0x510 [ 26.623253][ T385] addrconf_notify+0x9d8/0xea0 [ 26.627996][ T385] raw_notifier_call_chain+0x90/0x100 [ 26.633354][ T385] __dev_notify_flags+0x2f4/0x5b0 [ 26.638356][ T385] dev_change_flags+0xe3/0x1a0 [ 26.643116][ T385] page last free stack trace: [ 26.647780][ T385] __free_pages_ok+0x80b/0x830 [ 26.652526][ T385] __free_pages+0xd8/0x390 [ 26.656922][ T385] kfree+0x1e4/0x270 [ 26.660807][ T385] tipc_nametbl_stop+0x120b/0x1270 [ 26.665914][ T385] tipc_exit_net+0x99/0x150 [ 26.670407][ T385] cleanup_net+0x589/0xb80 [ 26.674811][ T385] process_one_work+0x6fd/0xbc0 [ 26.679647][ T385] worker_thread+0xa8e/0x13c0 [ 26.684305][ T385] kthread+0x324/0x3b0 [ 26.688369][ T385] ret_from_fork+0x1f/0x30 [ 26.692760][ T385] [ 26.695065][ T385] Memory state around the buggy address: [ 26.700675][ T385] ffff888121341800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 26.708721][ T385] ffff888121341880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 26.716820][ T385] >ffff888121341900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 26.724862][ T385] ^ [ 26.731604][ T385] ffff888121341980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 26.739648][ T385] ffff888121341a00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 26.747774][ T385] ================================================================== [ 26.755937][ T385] Disabling lock debugging due to kernel taint