syzkaller syzkaller login: [ 13.810932][ T24] kauditd_printk_skb: 25 callbacks suppressed [ 13.810942][ T24] audit: type=1400 audit(1783485743.970:59): 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 [ 13.821679][ T24] audit: type=1400 audit(1783485743.970:60): 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 [ 13.829192][ T24] audit: type=1400 audit(1783485743.970:61): avc: denied { write } for pid=217 comm="sh" path="pipe:[14000]" dev="pipefs" ino=14000 scontext=root:sysadm_r:sysadm_t tcontext=system_u:system_r:sshd_t tclass=fifo_file permissive=1 [ 13.849835][ T24] audit: type=1400 audit(1783485743.970:62): 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 [ 13.869005][ T24] audit: type=1400 audit(1783485743.970:63): 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 '10.128.0.84' (ED25519) to the list of known hosts. 2026/07/08 04:42:33 parsed 1 programs 2026/07/08 04:42:33 serving rpc on tcp://45021 [ 23.144890][ T24] audit: type=1400 audit(1783485753.300:64): 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 [ 23.166462][ T24] audit: type=1400 audit(1783485753.300:65): 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 [ 23.186516][ T24] audit: type=1400 audit(1783485753.300:66): 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 [ 23.809392][ T24] audit: type=1400 audit(1783485753.960:67): 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 [ 23.810369][ T293] cgroup: Unknown subsys name 'net' [ 23.832058][ T24] audit: type=1400 audit(1783485753.960:68): 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 [ 23.859507][ T24] audit: type=1400 audit(1783485753.990:69): 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 [ 23.859651][ T293] cgroup: Unknown subsys name 'devices' [ 23.972067][ T293] cgroup: Unknown subsys name 'hugetlb' [ 23.977939][ T293] cgroup: Unknown subsys name 'rlimit' [ 24.149459][ T24] audit: type=1400 audit(1783485754.300:70): 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 [ 24.173166][ T24] audit: type=1400 audit(1783485754.300:71): 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 [ 24.179041][ T298] SELinux: Context root:object_r:swapfile_t is not valid (left unmapped). [ 24.193784][ T24] audit: type=1400 audit(1783485754.300:72): 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 [ 24.222732][ T24] audit: type=1400 audit(1783485754.300:73): 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 [ 24.252053][ T293] Adding 124996k swap on ./swap-file. Priority:0 extents:1 across:124996k [ 24.680960][ T300] request_module fs-gadgetfs succeeded, but still no fs? [ 24.691686][ T300] cgroup: cgroup: disabling cgroup2 socket matching due to net_prio or net_cls activation [ 25.259661][ T350] bridge0: port 1(bridge_slave_0) entered blocking state [ 25.266942][ T350] bridge0: port 1(bridge_slave_0) entered disabled state [ 25.274383][ T350] device bridge_slave_0 entered promiscuous mode [ 25.281266][ T350] bridge0: port 2(bridge_slave_1) entered blocking state [ 25.288277][ T350] bridge0: port 2(bridge_slave_1) entered disabled state [ 25.295645][ T350] device bridge_slave_1 entered promiscuous mode [ 25.328466][ T350] bridge0: port 2(bridge_slave_1) entered blocking state [ 25.335528][ T350] bridge0: port 2(bridge_slave_1) entered forwarding state [ 25.342934][ T350] bridge0: port 1(bridge_slave_0) entered blocking state [ 25.350063][ T350] bridge0: port 1(bridge_slave_0) entered forwarding state [ 25.366178][ T49] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 25.373959][ T49] bridge0: port 1(bridge_slave_0) entered disabled state [ 25.381484][ T49] bridge0: port 2(bridge_slave_1) entered disabled state [ 25.390110][ T49] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 25.398307][ T49] bridge0: port 1(bridge_slave_0) entered blocking state [ 25.405980][ T49] bridge0: port 1(bridge_slave_0) entered forwarding state [ 25.414911][ T49] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 25.423084][ T49] bridge0: port 2(bridge_slave_1) entered blocking state [ 25.430112][ T49] bridge0: port 2(bridge_slave_1) entered forwarding state [ 25.441992][ T49] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 25.450979][ T49] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 25.463899][ T49] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready [ 25.474555][ T49] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready [ 25.482683][ T49] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready [ 25.490155][ T49] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready [ 25.505100][ T350] device veth0_vlan entered promiscuous mode [ 25.515256][ T49] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready [ 25.528638][ T350] device veth1_macvtap entered promiscuous mode [ 25.537249][ T49] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready [ 25.547180][ T49] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready 2026/07/08 04:42:35 executed programs: 0 [ 25.825840][ T365] bridge0: port 1(bridge_slave_0) entered blocking state [ 25.833140][ T365] bridge0: port 1(bridge_slave_0) entered disabled state [ 25.840764][ T365] device bridge_slave_0 entered promiscuous mode [ 25.852537][ T365] bridge0: port 2(bridge_slave_1) entered blocking state [ 25.859564][ T365] bridge0: port 2(bridge_slave_1) entered disabled state [ 25.867021][ T365] device bridge_slave_1 entered promiscuous mode [ 25.908843][ T365] bridge0: port 2(bridge_slave_1) entered blocking state [ 25.916013][ T365] bridge0: port 2(bridge_slave_1) entered forwarding state [ 25.924323][ T365] bridge0: port 1(bridge_slave_0) entered blocking state [ 25.931928][ T365] bridge0: port 1(bridge_slave_0) entered forwarding state [ 25.949157][ T49] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 25.956810][ T49] bridge0: port 1(bridge_slave_0) entered disabled state [ 25.964288][ T49] bridge0: port 2(bridge_slave_1) entered disabled state [ 25.973128][ T49] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 25.981553][ T49] bridge0: port 1(bridge_slave_0) entered blocking state [ 25.988672][ T49] bridge0: port 1(bridge_slave_0) entered forwarding state [ 26.006148][ T49] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 26.014517][ T49] bridge0: port 2(bridge_slave_1) entered blocking state [ 26.021571][ T49] bridge0: port 2(bridge_slave_1) entered forwarding state [ 26.029088][ T49] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 26.037696][ T49] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 26.051268][ T49] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready [ 26.062115][ T49] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready [ 26.070038][ T49] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready [ 26.077668][ T49] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready [ 26.085798][ T365] device veth0_vlan entered promiscuous mode [ 26.097101][ T49] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready [ 26.106367][ T365] device veth1_macvtap entered promiscuous mode [ 26.115286][ T49] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready [ 26.125202][ T49] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready [ 26.147275][ T393] ================================================================== [ 26.155375][ T393] BUG: KASAN: use-after-free in mutex_lock+0x85/0xf0 [ 26.162139][ T393] Write of size 8 at addr ffff8881110e2d50 by task syz.2.17/393 [ 26.169928][ T393] [ 26.172469][ T393] CPU: 1 PID: 393 Comm: syz.2.17 Not tainted syzkaller #0 [ 26.179568][ T393] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 [ 26.189617][ T393] Call Trace: [ 26.192988][ T393] __dump_stack+0x21/0x24 [ 26.197375][ T393] dump_stack_lvl+0x1a7/0x208 [ 26.202372][ T393] ? show_regs_print_info+0x18/0x18 [ 26.207576][ T393] ? thaw_kernel_threads+0x220/0x220 [ 26.212866][ T393] ? debug_smp_processor_id+0x17/0x20 [ 26.218238][ T393] print_address_description+0x7f/0x2c0 [ 26.223972][ T393] ? mutex_lock+0x85/0xf0 [ 26.228389][ T393] kasan_report+0x100/0x140 [ 26.233236][ T393] ? mutex_lock+0x85/0xf0 [ 26.237594][ T393] kasan_check_range+0x249/0x2a0 [ 26.242540][ T393] __kasan_check_write+0x14/0x20 [ 26.247482][ T393] mutex_lock+0x85/0xf0 [ 26.251639][ T393] ? mutex_trylock+0xb0/0xb0 [ 26.256238][ T393] ? l2tp_session_put+0xb2/0x1a0 [ 26.261271][ T393] ? l2tp_session_delete+0x3a9/0x4a0 [ 26.266598][ T393] pppol2tp_release+0x178/0x2b0 [ 26.271651][ T393] sock_close+0xb8/0x200 [ 26.275899][ T393] ? sock_mmap+0xa0/0xa0 [ 26.280156][ T393] __fput+0x2dc/0x730 [ 26.284124][ T393] ____fput+0x15/0x20 [ 26.288096][ T393] task_work_run+0x127/0x190 [ 26.292705][ T393] exit_to_user_mode_loop+0xcb/0xe0 [ 26.297918][ T393] exit_to_user_mode_prepare+0x76/0xa0 [ 26.303378][ T393] syscall_exit_to_user_mode+0x1d/0x40 [ 26.308822][ T393] do_syscall_64+0x3d/0x40 [ 26.313226][ T393] entry_SYSCALL_64_after_hwframe+0x61/0xcb [ 26.319461][ T393] RIP: 0033:0x7fb758202e59 [ 26.324376][ T393] 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 [ 26.344071][ T393] RSP: 002b:00007ffcc8a3d808 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4 [ 26.352578][ T393] RAX: 0000000000000000 RBX: 00007ffcc8a3d8f0 RCX: 00007fb758202e59 [ 26.360543][ T393] RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003 [ 26.368502][ T393] RBP: 00000000000065f9 R08: 0000000000000001 R09: 0000000000000000 [ 26.376495][ T393] R10: 0000001b32c20000 R11: 0000000000000246 R12: 0000000000000000 [ 26.384588][ T393] R13: 00007fb75848afac R14: 00007fb75848afa8 R15: 00007fb75848afa0 [ 26.392557][ T393] [ 26.394971][ T393] Allocated by task 393: [ 26.399572][ T393] __kasan_kmalloc+0xd4/0x100 [ 26.404258][ T393] __kmalloc+0x19f/0x330 [ 26.408512][ T393] l2tp_session_create+0x39/0xb60 [ 26.413526][ T393] pppol2tp_connect+0xbf5/0x1640 [ 26.418463][ T393] __sys_connect+0x3ce/0x450 [ 26.423047][ T393] __x64_sys_connect+0x7a/0x90 [ 26.427805][ T393] do_syscall_64+0x31/0x40 [ 26.432225][ T393] entry_SYSCALL_64_after_hwframe+0x61/0xcb [ 26.438103][ T393] [ 26.440430][ T393] Freed by task 393: [ 26.444317][ T393] kasan_set_track+0x4a/0x70 [ 26.448900][ T393] kasan_set_free_info+0x23/0x40 [ 26.453829][ T393] ____kasan_slab_free+0x125/0x160 [ 26.459107][ T393] __kasan_slab_free+0x11/0x20 [ 26.463863][ T393] slab_free_freelist_hook+0xc5/0x190 [ 26.469226][ T393] kfree+0xc0/0x270 [ 26.473220][ T393] l2tp_session_put+0xb2/0x1a0 [ 26.478081][ T393] l2tp_session_delete+0x3a9/0x4a0 [ 26.483219][ T393] pppol2tp_release+0x169/0x2b0 [ 26.488895][ T393] sock_close+0xb8/0x200 [ 26.493547][ T393] __fput+0x2dc/0x730 [ 26.497976][ T393] ____fput+0x15/0x20 [ 26.502598][ T393] task_work_run+0x127/0x190 [ 26.507309][ T393] exit_to_user_mode_loop+0xcb/0xe0 [ 26.512511][ T393] exit_to_user_mode_prepare+0x76/0xa0 [ 26.517999][ T393] syscall_exit_to_user_mode+0x1d/0x40 [ 26.523556][ T393] do_syscall_64+0x3d/0x40 [ 26.528058][ T393] entry_SYSCALL_64_after_hwframe+0x61/0xcb [ 26.533936][ T393] [ 26.536263][ T393] The buggy address belongs to the object at ffff8881110e2c00 [ 26.536263][ T393] which belongs to the cache kmalloc-512 of size 512 [ 26.550314][ T393] The buggy address is located 336 bytes inside of [ 26.550314][ T393] 512-byte region [ffff8881110e2c00, ffff8881110e2e00) [ 26.563880][ T393] The buggy address belongs to the page: [ 26.569533][ T393] page:ffffea0004443800 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1110e0 [ 26.579885][ T393] head:ffffea0004443800 order:2 compound_mapcount:0 compound_pincount:0 [ 26.588291][ T393] flags: 0x4000000000010200(slab|head) [ 26.593748][ T393] raw: 4000000000010200 dead000000000100 dead000000000122 ffff888100043080 [ 26.602325][ T393] raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000 [ 26.611539][ T393] page dumped because: kasan: bad access detected [ 26.617943][ T393] page_owner tracks the page as allocated [ 26.624344][ T393] 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 26137355512, free_ts 26094177951 [ 26.645107][ T393] prep_new_page+0x176/0x190 [ 26.649902][ T393] get_page_from_freelist+0x225f/0x23f0 [ 26.656539][ T393] __alloc_pages_nodemask+0x29a/0x640 [ 26.662001][ T393] new_slab+0x84/0x3f0 [ 26.666069][ T393] ___slab_alloc+0x2f8/0x4c0 [ 26.670657][ T393] __slab_alloc+0x63/0xa0 [ 26.675197][ T393] __kmalloc+0x1f9/0x330 [ 26.679456][ T393] qdisc_alloc+0x79/0x720 [ 26.683779][ T393] qdisc_create_dflt+0x6b/0x390 [ 26.688623][ T393] dev_activate+0x292/0x11c0 [ 26.693219][ T393] __dev_open+0x3e9/0x500 [ 26.697539][ T393] __dev_change_flags+0x1e4/0x6a0 [ 26.702551][ T393] dev_change_flags+0x80/0x1a0 [ 26.707305][ T393] do_setlink+0xb19/0x29a0 [ 26.712198][ T393] rtnl_newlink+0x13e6/0x1830 [ 26.716870][ T393] rtnetlink_rcv_msg+0x9e9/0xca0 [ 26.721794][ T393] page last free stack trace: [ 26.726467][ T393] __free_pages_ok+0x80b/0x830 [ 26.731231][ T393] __free_pages+0xd8/0x390 [ 26.735725][ T393] __free_slab+0xcf/0x190 [ 26.740143][ T393] unfreeze_partials+0x150/0x180 [ 26.745075][ T393] put_cpu_partial+0xc1/0x180 [ 26.749938][ T393] __slab_free+0x2c9/0x3a0 [ 26.754346][ T393] ___cache_free+0x10e/0x130 [ 26.758927][ T393] qlink_free+0x50/0x90 [ 26.763075][ T393] qlist_free_all+0x5f/0xb0 [ 26.767668][ T393] kasan_quarantine_reduce+0x14a/0x160 [ 26.773122][ T393] __kasan_slab_alloc+0x2f/0xe0 [ 26.778057][ T393] slab_post_alloc_hook+0x5d/0x2f0 [ 26.783264][ T393] __kmalloc+0x17b/0x330 [ 26.787502][ T393] kvmalloc_node+0x88/0x130 [ 26.792042][ T393] __nf_hook_entries_try_shrink+0x345/0x740 [ 26.797926][ T393] __nf_unregister_net_hook+0x3ae/0x560 [ 26.803565][ T393] [ 26.805886][ T393] Memory state around the buggy address: [ 26.813583][ T393] ffff8881110e2c00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 26.821854][ T393] ffff8881110e2c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 26.829913][ T393] >ffff8881110e2d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 26.838055][ T393] ^ [ 26.844730][ T393] ffff8881110e2d80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 26.852871][ T393] ffff8881110e2e00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 26.860944][ T393] ================================================================== [ 26.868999][ T393] Disabling lock debugging due to kernel taint