syzkaller syzkaller login: [ 12.782998][ T24] kauditd_printk_skb: 48 callbacks suppressed [ 12.783010][ T24] audit: type=1400 audit(1782165515.930:59): 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 [ 12.794031][ T24] audit: type=1400 audit(1782165515.930:60): 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 [ 12.801643][ T24] audit: type=1400 audit(1782165515.940:61): avc: denied { write } for pid=217 comm="sh" path="pipe:[14009]" dev="pipefs" ino=14009 scontext=root:sysadm_r:sysadm_t tcontext=system_u:system_r:sshd_t tclass=fifo_file permissive=1 [ 12.810360][ T24] audit: type=1400 audit(1782165515.940:62): 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 [ 12.817537][ T24] audit: type=1400 audit(1782165515.940:63): 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 '10.128.0.204' (ED25519) to the list of known hosts. 2026/06/22 21:58:45 parsed 1 programs 2026/06/22 21:58:45 serving rpc on tcp://34077 [ 22.501570][ T24] audit: type=1400 audit(1782165525.650:64): 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 [ 22.522674][ T24] audit: type=1400 audit(1782165525.650:65): 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 [ 22.542504][ T24] audit: type=1400 audit(1782165525.650:66): 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 [ 23.435361][ T24] audit: type=1400 audit(1782165526.580:67): 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 [ 23.438715][ T293] cgroup: Unknown subsys name 'net' [ 23.458157][ T24] audit: type=1400 audit(1782165526.590:68): 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 [ 23.485326][ T24] audit: type=1400 audit(1782165526.610:69): 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 [ 23.485907][ T293] cgroup: Unknown subsys name 'devices' [ 23.627449][ T293] cgroup: Unknown subsys name 'hugetlb' [ 23.633052][ T293] cgroup: Unknown subsys name 'rlimit' [ 23.752454][ T24] audit: type=1400 audit(1782165526.900:70): 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 [ 23.775662][ T24] audit: type=1400 audit(1782165526.900:71): 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 [ 23.796104][ T24] audit: type=1400 audit(1782165526.900:72): 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 [ 23.816424][ T24] audit: type=1400 audit(1782165526.900:73): 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 [ 23.841323][ T297] SELinux: Context root:object_r:swapfile_t is not valid (left unmapped). [ 23.881997][ T293] Adding 124996k swap on ./swap-file. Priority:0 extents:1 across:124996k [ 24.294638][ T300] request_module fs-gadgetfs succeeded, but still no fs? [ 24.305665][ T300] cgroup: cgroup: disabling cgroup2 socket matching due to net_prio or net_cls activation [ 25.010817][ T355] bridge0: port 1(bridge_slave_0) entered blocking state [ 25.017993][ T355] bridge0: port 1(bridge_slave_0) entered disabled state [ 25.025339][ T355] device bridge_slave_0 entered promiscuous mode [ 25.032296][ T355] bridge0: port 2(bridge_slave_1) entered blocking state [ 25.039338][ T355] bridge0: port 2(bridge_slave_1) entered disabled state [ 25.046990][ T355] device bridge_slave_1 entered promiscuous mode [ 25.087439][ T355] bridge0: port 2(bridge_slave_1) entered blocking state [ 25.094496][ T355] bridge0: port 2(bridge_slave_1) entered forwarding state [ 25.101815][ T355] bridge0: port 1(bridge_slave_0) entered blocking state [ 25.108901][ T355] bridge0: port 1(bridge_slave_0) entered forwarding state [ 25.126717][ T7] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 25.134338][ T7] bridge0: port 1(bridge_slave_0) entered disabled state [ 25.142099][ T7] bridge0: port 2(bridge_slave_1) entered disabled state [ 25.155872][ T7] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 25.164022][ T7] bridge0: port 1(bridge_slave_0) entered blocking state [ 25.171101][ T7] bridge0: port 1(bridge_slave_0) entered forwarding state [ 25.180311][ T7] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 25.188706][ T7] bridge0: port 2(bridge_slave_1) entered blocking state [ 25.195774][ T7] bridge0: port 2(bridge_slave_1) entered forwarding state [ 25.212409][ T7] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 25.221452][ T7] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 25.234484][ T7] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready [ 25.250431][ T7] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready [ 25.258587][ T7] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready [ 25.266266][ T7] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready [ 25.274323][ T355] device veth0_vlan entered promiscuous mode [ 25.290639][ T7] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready [ 25.299659][ T355] device veth1_macvtap entered promiscuous mode [ 25.309220][ T7] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready [ 25.319138][ T7] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready 2026/06/22 21:58:48 executed programs: 0 [ 25.598248][ T365] bridge0: port 1(bridge_slave_0) entered blocking state [ 25.605313][ T365] bridge0: port 1(bridge_slave_0) entered disabled state [ 25.612822][ T365] device bridge_slave_0 entered promiscuous mode [ 25.619885][ T365] bridge0: port 2(bridge_slave_1) entered blocking state [ 25.627855][ T365] bridge0: port 2(bridge_slave_1) entered disabled state [ 25.635314][ T365] device bridge_slave_1 entered promiscuous mode [ 25.678820][ T365] bridge0: port 2(bridge_slave_1) entered blocking state [ 25.685882][ T365] bridge0: port 2(bridge_slave_1) entered forwarding state [ 25.693132][ T365] bridge0: port 1(bridge_slave_0) entered blocking state [ 25.700341][ T365] bridge0: port 1(bridge_slave_0) entered forwarding state [ 25.719144][ T7] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 25.727137][ T7] bridge0: port 1(bridge_slave_0) entered disabled state [ 25.734474][ T7] bridge0: port 2(bridge_slave_1) entered disabled state [ 25.743525][ T7] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 25.752211][ T7] bridge0: port 1(bridge_slave_0) entered blocking state [ 25.759287][ T7] bridge0: port 1(bridge_slave_0) entered forwarding state [ 25.767730][ T7] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 25.775941][ T7] bridge0: port 2(bridge_slave_1) entered blocking state [ 25.782988][ T7] bridge0: port 2(bridge_slave_1) entered forwarding state [ 25.794678][ T7] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 25.803728][ T7] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 25.817362][ T7] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready [ 25.828974][ T7] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready [ 25.837147][ T7] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready [ 25.844564][ T7] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready [ 25.858068][ T365] device veth0_vlan entered promiscuous mode [ 25.867855][ T7] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready [ 25.876797][ T365] device veth1_macvtap entered promiscuous mode [ 25.885653][ T7] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready [ 25.900250][ T7] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready [ 25.922353][ T399] ================================================================== [ 25.930458][ T399] BUG: KASAN: use-after-free in rcu_segcblist_enqueue+0x85/0xa0 [ 25.938082][ T399] Write of size 8 at addr ffff8881112b5d90 by task syz.2.17/399 [ 25.945709][ T399] [ 25.948056][ T399] CPU: 1 PID: 399 Comm: syz.2.17 Not tainted syzkaller #0 [ 25.955153][ T399] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 [ 25.965200][ T399] Call Trace: [ 25.968488][ T399] __dump_stack+0x21/0x24 [ 25.972817][ T399] dump_stack_lvl+0x1a7/0x208 [ 25.977490][ T399] ? show_regs_print_info+0x18/0x18 [ 25.982698][ T399] ? thaw_kernel_threads+0x220/0x220 [ 25.987977][ T399] print_address_description+0x7f/0x2c0 [ 25.993516][ T399] ? rcu_segcblist_enqueue+0x85/0xa0 [ 25.998792][ T399] kasan_report+0x100/0x140 [ 26.003291][ T399] ? rcu_segcblist_enqueue+0x85/0xa0 [ 26.008575][ T399] __asan_report_store8_noabort+0x17/0x20 [ 26.014288][ T399] rcu_segcblist_enqueue+0x85/0xa0 [ 26.019402][ T399] call_rcu+0x4df/0x1090 [ 26.023646][ T399] ? rcu_gp_kthread_wake+0x90/0x90 [ 26.028752][ T399] ? __kasan_check_write+0x14/0x20 [ 26.033859][ T399] ? __wake_up_bit+0x120/0x120 [ 26.038621][ T399] security_inode_free+0xb4/0xd0 [ 26.043554][ T399] __destroy_inode+0x175/0x4f0 [ 26.048312][ T399] evict+0x7e8/0x940 [ 26.052201][ T399] ? mode_strip_sgid+0x150/0x150 [ 26.057138][ T399] ? _raw_spin_lock+0x94/0xf0 [ 26.061805][ T399] ? _raw_spin_trylock_bh+0x150/0x150 [ 26.067170][ T399] ? __kasan_check_read+0x11/0x20 [ 26.072189][ T399] ? __kasan_check_write+0x14/0x20 [ 26.077293][ T399] iput+0x654/0x7e0 [ 26.081098][ T399] dentry_unlink_inode+0x2d5/0x390 [ 26.086309][ T399] __dentry_kill+0x45b/0x660 [ 26.090936][ T399] dentry_kill+0xc0/0x2a0 [ 26.095259][ T399] dput+0x42/0x80 [ 26.098890][ T399] __fput+0x4bd/0x730 [ 26.102878][ T399] ____fput+0x15/0x20 [ 26.106854][ T399] task_work_run+0x127/0x190 [ 26.111440][ T399] exit_to_user_mode_loop+0xcb/0xe0 [ 26.116631][ T399] exit_to_user_mode_prepare+0x76/0xa0 [ 26.122086][ T399] syscall_exit_to_user_mode+0x1d/0x40 [ 26.127538][ T399] do_syscall_64+0x3d/0x40 [ 26.131968][ T399] entry_SYSCALL_64_after_hwframe+0x61/0xcb [ 26.137854][ T399] RIP: 0033:0x7fed5471ce59 [ 26.142267][ T399] 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 [ 26.161885][ T399] RSP: 002b:00007ffd914e00f8 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4 [ 26.170305][ T399] RAX: 0000000000000000 RBX: 00007ffd914e01e0 RCX: 00007fed5471ce59 [ 26.178277][ T399] RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003 [ 26.186259][ T399] RBP: 0000000000006526 R08: 0000000000000001 R09: 0000000000000000 [ 26.194223][ T399] R10: 0000001b32c20000 R11: 0000000000000246 R12: 0000000000000000 [ 26.202192][ T399] R13: 00007fed54995fac R14: 00007fed54995fa8 R15: 00007fed54995fa0 [ 26.210178][ T399] [ 26.212502][ T399] Allocated by task 399: [ 26.216785][ T399] __kasan_kmalloc+0xd4/0x100 [ 26.221456][ T399] __kmalloc+0x19f/0x330 [ 26.225733][ T399] l2tp_session_create+0x39/0xb60 [ 26.230763][ T399] pppol2tp_connect+0xbf5/0x1640 [ 26.235714][ T399] __sys_connect+0x3ce/0x450 [ 26.240302][ T399] __x64_sys_connect+0x7a/0x90 [ 26.245053][ T399] do_syscall_64+0x31/0x40 [ 26.249473][ T399] entry_SYSCALL_64_after_hwframe+0x61/0xcb [ 26.255350][ T399] [ 26.257679][ T399] Freed by task 7: [ 26.261409][ T399] kasan_set_track+0x4a/0x70 [ 26.265994][ T399] kasan_set_free_info+0x23/0x40 [ 26.270926][ T399] ____kasan_slab_free+0x125/0x160 [ 26.276031][ T399] __kasan_slab_free+0x11/0x20 [ 26.280790][ T399] slab_free_freelist_hook+0xc5/0x190 [ 26.286170][ T399] kfree+0xc0/0x270 [ 26.289986][ T399] l2tp_session_put+0xb2/0x1a0 [ 26.294744][ T399] l2tp_session_delete+0x3a9/0x4a0 [ 26.299850][ T399] l2tp_tunnel_del_work+0x180/0x3d0 [ 26.305039][ T399] process_one_work+0x6fd/0xbc0 [ 26.309881][ T399] worker_thread+0xa8e/0x13c0 [ 26.314551][ T399] kthread+0x324/0x3b0 [ 26.318610][ T399] ret_from_fork+0x1f/0x30 [ 26.323012][ T399] [ 26.325334][ T399] Last potentially related work creation: [ 26.331047][ T399] kasan_save_stack+0x3a/0x60 [ 26.335739][ T399] __kasan_record_aux_stack+0xd2/0x100 [ 26.341209][ T399] kasan_record_aux_stack_noalloc+0xb/0x10 [ 26.347014][ T399] call_rcu+0x11a/0x1090 [ 26.351252][ T399] pppol2tp_release+0x1e3/0x2b0 [ 26.356097][ T399] sock_close+0xb8/0x200 [ 26.360332][ T399] __fput+0x2dc/0x730 [ 26.364313][ T399] ____fput+0x15/0x20 [ 26.368286][ T399] task_work_run+0x127/0x190 [ 26.372869][ T399] exit_to_user_mode_loop+0xcb/0xe0 [ 26.378057][ T399] exit_to_user_mode_prepare+0x76/0xa0 [ 26.383526][ T399] syscall_exit_to_user_mode+0x1d/0x40 [ 26.388973][ T399] do_syscall_64+0x3d/0x40 [ 26.393376][ T399] entry_SYSCALL_64_after_hwframe+0x61/0xcb [ 26.399255][ T399] [ 26.401578][ T399] The buggy address belongs to the object at ffff8881112b5c00 [ 26.401578][ T399] which belongs to the cache kmalloc-512 of size 512 [ 26.415631][ T399] The buggy address is located 400 bytes inside of [ 26.415631][ T399] 512-byte region [ffff8881112b5c00, ffff8881112b5e00) [ 26.428894][ T399] The buggy address belongs to the page: [ 26.434536][ T399] page:ffffea000444ad00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1112b4 [ 26.444767][ T399] head:ffffea000444ad00 order:2 compound_mapcount:0 compound_pincount:0 [ 26.453088][ T399] flags: 0x4000000000010200(slab|head) [ 26.458547][ T399] raw: 4000000000010200 dead000000000100 dead000000000122 ffff888100043080 [ 26.467216][ T399] raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000 [ 26.475797][ T399] page dumped because: kasan: bad access detected [ 26.482210][ T399] page_owner tracks the page as allocated [ 26.487925][ T399] 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 25913548901, free_ts 25896318851 [ 26.508318][ T399] prep_new_page+0x176/0x190 [ 26.512902][ T399] get_page_from_freelist+0x225f/0x23f0 [ 26.518441][ T399] __alloc_pages_nodemask+0x29a/0x640 [ 26.523802][ T399] new_slab+0x84/0x3f0 [ 26.527865][ T399] ___slab_alloc+0x2f8/0x4c0 [ 26.532445][ T399] __slab_alloc+0x63/0xa0 [ 26.536771][ T399] __kmalloc+0x1f9/0x330 [ 26.541003][ T399] qdisc_alloc+0x79/0x720 [ 26.545328][ T399] qdisc_create_dflt+0x6b/0x390 [ 26.550172][ T399] dev_activate+0x292/0x11c0 [ 26.554755][ T399] __dev_open+0x3e9/0x500 [ 26.559083][ T399] __dev_change_flags+0x1e4/0x6a0 [ 26.564096][ T399] dev_change_flags+0x80/0x1a0 [ 26.568856][ T399] do_setlink+0xb19/0x29a0 [ 26.573289][ T399] rtnl_newlink+0x13e6/0x1830 [ 26.577962][ T399] rtnetlink_rcv_msg+0x9e9/0xca0 [ 26.582894][ T399] page last free stack trace: [ 26.587598][ T399] __free_pages_ok+0x80b/0x830 [ 26.592358][ T399] __free_pages+0xd8/0x390 [ 26.596771][ T399] __free_slab+0xcf/0x190 [ 26.601090][ T399] unfreeze_partials+0x150/0x180 [ 26.606030][ T399] put_cpu_partial+0xc1/0x180 [ 26.610718][ T399] __slab_free+0x2c9/0x3a0 [ 26.615131][ T399] ___cache_free+0x10e/0x130 [ 26.619710][ T399] qlink_free+0x50/0x90 [ 26.623857][ T399] qlist_free_all+0x5f/0xb0 [ 26.628384][ T399] kasan_quarantine_reduce+0x14a/0x160 [ 26.633835][ T399] __kasan_slab_alloc+0x2f/0xe0 [ 26.638843][ T399] slab_post_alloc_hook+0x5d/0x2f0 [ 26.643956][ T399] kmem_cache_alloc+0x15a/0x2d0 [ 26.648807][ T399] __alloc_skb+0x9e/0x520 [ 26.653135][ T399] netlink_sendmsg+0x693/0xb70 [ 26.657887][ T399] __sys_sendto+0x467/0x620 [ 26.662378][ T399] [ 26.664705][ T399] Memory state around the buggy address: [ 26.670363][ T399] ffff8881112b5c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 26.678434][ T399] ffff8881112b5d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 26.686490][ T399] >ffff8881112b5d80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 26.694542][ T399] ^ [ 26.699125][ T399] ffff8881112b5e00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 26.707177][ T399] ffff8881112b5e80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 26.715228][ T399] ================================================================== [ 26.723279][ T399] Disabling lock debugging due to kernel taint