syzkaller syzkaller login: [ 13.482222][ T28] kauditd_printk_skb: 48 callbacks suppressed [ 13.482236][ T28] audit: type=1400 audit(1781937446.925:59): avc: denied { transition } for pid=225 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 [ 13.486661][ T28] audit: type=1400 audit(1781937446.925:60): avc: denied { noatsecure } for pid=225 comm="sshd-session" scontext=system_u:system_r:sshd_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1 [ 13.489880][ T28] audit: type=1400 audit(1781937446.925:61): avc: denied { write } for pid=225 comm="sh" path="pipe:[14464]" dev="pipefs" ino=14464 scontext=root:sysadm_r:sysadm_t tcontext=system_u:system_r:sshd_t tclass=fifo_file permissive=1 [ 13.493278][ T28] audit: type=1400 audit(1781937446.925:62): avc: denied { rlimitinh } for pid=225 comm="sh" scontext=system_u:system_r:sshd_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1 [ 13.496002][ T28] audit: type=1400 audit(1781937446.925:63): avc: denied { siginh } for pid=225 comm="sh" scontext=system_u:system_r:sshd_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1 Warning: Permanently added '10.128.1.15' (ED25519) to the list of known hosts. 2026/06/20 06:37:36 parsed 1 programs 2026/06/20 06:37:36 serving rpc on tcp://37295 [ 23.076603][ T28] audit: type=1400 audit(1781937456.515:64): avc: denied { node_bind } for pid=295 comm="syz-execprog" saddr=::1 scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:node_t tclass=tcp_socket permissive=1 [ 23.097943][ T28] audit: type=1400 audit(1781937456.515:65): avc: denied { module_request } for pid=295 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 [ 23.850921][ T28] audit: type=1400 audit(1781937457.295:66): avc: denied { mounton } for pid=302 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 [ 23.851938][ T302] cgroup: Unknown subsys name 'net' [ 23.873589][ T28] audit: type=1400 audit(1781937457.295:67): avc: denied { mount } for pid=302 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 [ 23.901366][ T28] audit: type=1400 audit(1781937457.325:68): avc: denied { unmount } for pid=302 comm="syz-executor" scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:cgroup_t tclass=filesystem permissive=1 [ 23.902112][ T302] cgroup: Unknown subsys name 'devices' [ 24.041207][ T302] cgroup: Unknown subsys name 'hugetlb' [ 24.046825][ T302] cgroup: Unknown subsys name 'rlimit' [ 24.154695][ T28] audit: type=1400 audit(1781937457.595:69): avc: denied { setattr } for pid=302 comm="syz-executor" name="raw-gadget" dev="devtmpfs" ino=258 scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:device_t tclass=chr_file permissive=1 [ 24.178075][ T28] audit: type=1400 audit(1781937457.595:70): avc: denied { create } for pid=302 comm="syz-executor" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=netlink_generic_socket permissive=1 [ 24.198574][ T28] audit: type=1400 audit(1781937457.595:71): avc: denied { write } for pid=302 comm="syz-executor" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=netlink_generic_socket permissive=1 [ 24.207076][ T305] SELinux: Context root:object_r:swapfile_t is not valid (left unmapped). [ 24.219042][ T28] audit: type=1400 audit(1781937457.595:72): avc: denied { read } for pid=302 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 [ 24.247765][ T28] audit: type=1400 audit(1781937457.595:73): avc: denied { mounton } for pid=302 comm="syz-executor" path="/proc/sys/fs/binfmt_misc" dev="binfmt_misc" ino=1 scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:binfmt_misc_fs_t tclass=dir permissive=1 [ 24.286402][ T302] Adding 124996k swap on ./swap-file. Priority:0 extents:1 across:124996k [ 24.915822][ T308] request_module fs-gadgetfs succeeded, but still no fs? [ 25.473178][ T347] bridge0: port 1(bridge_slave_0) entered blocking state [ 25.480251][ T347] bridge0: port 1(bridge_slave_0) entered disabled state [ 25.487578][ T347] device bridge_slave_0 entered promiscuous mode [ 25.494675][ T347] bridge0: port 2(bridge_slave_1) entered blocking state [ 25.501733][ T347] bridge0: port 2(bridge_slave_1) entered disabled state [ 25.509181][ T347] device bridge_slave_1 entered promiscuous mode [ 25.544074][ T347] bridge0: port 2(bridge_slave_1) entered blocking state [ 25.551743][ T347] bridge0: port 2(bridge_slave_1) entered forwarding state [ 25.558988][ T347] bridge0: port 1(bridge_slave_0) entered blocking state [ 25.566028][ T347] bridge0: port 1(bridge_slave_0) entered forwarding state [ 25.582655][ T10] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 25.590261][ T10] bridge0: port 1(bridge_slave_0) entered disabled state [ 25.597407][ T10] bridge0: port 2(bridge_slave_1) entered disabled state [ 25.606122][ T10] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 25.614369][ T10] bridge0: port 1(bridge_slave_0) entered blocking state [ 25.621420][ T10] bridge0: port 1(bridge_slave_0) entered forwarding state [ 25.630131][ T10] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 25.638827][ T10] bridge0: port 2(bridge_slave_1) entered blocking state [ 25.645880][ T10] bridge0: port 2(bridge_slave_1) entered forwarding state [ 25.659339][ T10] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 25.667546][ T10] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 25.680373][ T10] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready [ 25.692816][ T10] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready [ 25.700846][ T10] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready [ 25.708235][ T10] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready [ 25.716642][ T347] device veth0_vlan entered promiscuous mode [ 25.726115][ T10] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready [ 25.735067][ T347] device veth1_macvtap entered promiscuous mode [ 25.744691][ T10] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready [ 25.754556][ T10] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready 2026/06/20 06:37:39 executed programs: 0 [ 26.083764][ T370] bridge0: port 1(bridge_slave_0) entered blocking state [ 26.090860][ T370] bridge0: port 1(bridge_slave_0) entered disabled state [ 26.098163][ T370] device bridge_slave_0 entered promiscuous mode [ 26.110413][ T370] bridge0: port 2(bridge_slave_1) entered blocking state [ 26.117496][ T370] bridge0: port 2(bridge_slave_1) entered disabled state [ 26.124946][ T370] device bridge_slave_1 entered promiscuous mode [ 26.164964][ T370] bridge0: port 2(bridge_slave_1) entered blocking state [ 26.172022][ T370] bridge0: port 2(bridge_slave_1) entered forwarding state [ 26.179306][ T370] bridge0: port 1(bridge_slave_0) entered blocking state [ 26.186332][ T370] bridge0: port 1(bridge_slave_0) entered forwarding state [ 26.208911][ T316] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 26.216589][ T316] bridge0: port 1(bridge_slave_0) entered disabled state [ 26.224171][ T316] bridge0: port 2(bridge_slave_1) entered disabled state [ 26.233211][ T316] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 26.241502][ T316] bridge0: port 1(bridge_slave_0) entered blocking state [ 26.248535][ T316] bridge0: port 1(bridge_slave_0) entered forwarding state [ 26.264125][ T316] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 26.272283][ T316] bridge0: port 2(bridge_slave_1) entered blocking state [ 26.279325][ T316] bridge0: port 2(bridge_slave_1) entered forwarding state [ 26.286918][ T316] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 26.303139][ T316] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_hsr: link becomes ready [ 26.311308][ T316] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 26.322086][ T316] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_virt_wifi: link becomes ready [ 26.331246][ T316] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready [ 26.341691][ T316] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_vlan: link becomes ready [ 26.349896][ T316] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready [ 26.357858][ T316] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready [ 26.365501][ T316] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready [ 26.373773][ T370] device veth0_vlan entered promiscuous mode [ 26.384603][ T316] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_macvtap: link becomes ready [ 26.393097][ T316] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready [ 26.402582][ T370] device veth1_macvtap entered promiscuous mode [ 26.411627][ T316] IPv6: ADDRCONF(NETDEV_CHANGE): macsec0: link becomes ready [ 26.419449][ T316] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_0: link becomes ready [ 26.427718][ T316] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready [ 26.437359][ T316] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready [ 26.445831][ T316] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready [ 26.468303][ T375] ================================================================== [ 26.476383][ T375] BUG: KASAN: use-after-free in mutex_lock+0x86/0x1b0 [ 26.484389][ T375] Write of size 8 at addr ffff888110d6ed50 by task syz.2.17/375 [ 26.492244][ T375] [ 26.494559][ T375] CPU: 1 PID: 375 Comm: syz.2.17 Not tainted syzkaller #0 [ 26.501996][ T375] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 [ 26.512043][ T375] Call Trace: [ 26.515307][ T375] [ 26.518219][ T375] __dump_stack+0x21/0x24 [ 26.522529][ T375] dump_stack_lvl+0x110/0x170 [ 26.527186][ T375] ? __cfi_dump_stack_lvl+0x8/0x8 [ 26.532193][ T375] ? mutex_lock+0x86/0x1b0 [ 26.536596][ T375] print_address_description+0x71/0x200 [ 26.542146][ T375] print_report+0x4a/0x60 [ 26.546460][ T375] kasan_report+0x122/0x150 [ 26.550943][ T375] ? mutex_lock+0x86/0x1b0 [ 26.555340][ T375] kasan_check_range+0x249/0x2a0 [ 26.560257][ T375] __kasan_check_write+0x14/0x20 [ 26.565176][ T375] mutex_lock+0x86/0x1b0 [ 26.569411][ T375] ? __cfi_mutex_lock+0x10/0x10 [ 26.574264][ T375] ? kfree+0x6f/0xf0 [ 26.578141][ T375] ? l2tp_session_put+0xaf/0x1a0 [ 26.583125][ T375] ? l2tp_session_delete+0x3df/0x4d0 [ 26.588407][ T375] pppol2tp_release+0x178/0x2b0 [ 26.593260][ T375] sock_close+0xc9/0x220 [ 26.597502][ T375] ? __cfi_sock_close+0x10/0x10 [ 26.602336][ T375] __fput+0x1fd/0x8f0 [ 26.606345][ T375] ____fput+0x15/0x20 [ 26.610341][ T375] task_work_run+0x1e1/0x250 [ 26.614915][ T375] ? __cfi_task_work_run+0x10/0x10 [ 26.620033][ T375] ? __cfi___close_range+0x10/0x10 [ 26.625131][ T375] exit_to_user_mode_loop+0x9b/0xb0 [ 26.630320][ T375] exit_to_user_mode_prepare+0x87/0xd0 [ 26.635764][ T375] syscall_exit_to_user_mode+0x1a/0x30 [ 26.641204][ T375] do_syscall_64+0x58/0xa0 [ 26.645613][ T375] ? clear_bhb_loop+0x30/0x80 [ 26.650278][ T375] ? clear_bhb_loop+0x30/0x80 [ 26.654941][ T375] entry_SYSCALL_64_after_hwframe+0x68/0xd2 [ 26.660844][ T375] RIP: 0033:0x7fbf78d9ce59 [ 26.665281][ T375] 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 [ 26.684972][ T375] RSP: 002b:00007fffc0bf8728 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4 [ 26.693464][ T375] RAX: 0000000000000000 RBX: 00007fffc0bf8810 RCX: 00007fbf78d9ce59 [ 26.701432][ T375] RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003 [ 26.709391][ T375] RBP: 000000000000674f R08: 0000000000000001 R09: 0000000000000000 [ 26.717447][ T375] R10: 0000001b33120000 R11: 0000000000000246 R12: 0000000000000000 [ 26.725436][ T375] R13: 00007fbf79015fac R14: 00007fbf79015fa8 R15: 00007fbf79015fa0 [ 26.733910][ T375] [ 26.736946][ T375] [ 26.739251][ T375] Allocated by task 375: [ 26.744011][ T375] kasan_set_track+0x4b/0x70 [ 26.748675][ T375] kasan_save_alloc_info+0x1f/0x30 [ 26.753778][ T375] __kasan_kmalloc+0x95/0xb0 [ 26.758360][ T375] __kmalloc+0xb4/0x1e0 [ 26.762583][ T375] l2tp_session_create+0x38/0xbd0 [ 26.767659][ T375] pppol2tp_connect+0xbf5/0x1640 [ 26.772682][ T375] __sys_connect+0x3da/0x460 [ 26.777697][ T375] __x64_sys_connect+0x7a/0x90 [ 26.782440][ T375] x64_sys_call+0x88d/0x9a0 [ 26.787134][ T375] do_syscall_64+0x4c/0xa0 [ 26.791541][ T375] entry_SYSCALL_64_after_hwframe+0x68/0xd2 [ 26.797494][ T375] [ 26.799986][ T375] Freed by task 375: [ 26.803864][ T375] kasan_set_track+0x4b/0x70 [ 26.808627][ T375] kasan_save_free_info+0x2b/0x40 [ 26.813814][ T375] ____kasan_slab_free+0x132/0x180 [ 26.818904][ T375] __kasan_slab_free+0x11/0x20 [ 26.823647][ T375] slab_free_freelist_hook+0xc2/0x190 [ 26.829004][ T375] __kmem_cache_free+0xb7/0x1b0 [ 26.833921][ T375] kfree+0x6f/0xf0 [ 26.837620][ T375] l2tp_session_put+0xaf/0x1a0 [ 26.842362][ T375] l2tp_session_delete+0x3df/0x4d0 [ 26.847464][ T375] pppol2tp_release+0x169/0x2b0 [ 26.852649][ T375] sock_close+0xc9/0x220 [ 26.856892][ T375] __fput+0x1fd/0x8f0 [ 26.860861][ T375] ____fput+0x15/0x20 [ 26.864831][ T375] task_work_run+0x1e1/0x250 [ 26.869403][ T375] exit_to_user_mode_loop+0x9b/0xb0 [ 26.874638][ T375] exit_to_user_mode_prepare+0x87/0xd0 [ 26.880479][ T375] syscall_exit_to_user_mode+0x1a/0x30 [ 26.886014][ T375] do_syscall_64+0x58/0xa0 [ 26.890515][ T375] entry_SYSCALL_64_after_hwframe+0x68/0xd2 [ 26.896545][ T375] [ 26.898864][ T375] The buggy address belongs to the object at ffff888110d6ec00 [ 26.898864][ T375] which belongs to the cache kmalloc-512 of size 512 [ 26.913336][ T375] The buggy address is located 336 bytes inside of [ 26.913336][ T375] 512-byte region [ffff888110d6ec00, ffff888110d6ee00) [ 26.926601][ T375] [ 26.928931][ T375] The buggy address belongs to the physical page: [ 26.935348][ T375] page:ffffea0004435b00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x110d6c [ 26.945579][ T375] head:ffffea0004435b00 order:2 compound_mapcount:0 compound_pincount:0 [ 26.954071][ T375] flags: 0x4000000000010200(slab|head|zone=1) [ 26.960148][ T375] raw: 4000000000010200 0000000000000000 dead000000000122 ffff888100042f00 [ 26.968726][ T375] raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000 [ 26.977291][ T375] page dumped because: kasan: bad access detected [ 26.983687][ T375] page_owner tracks the page as allocated [ 26.989381][ T375] 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 370, tgid 370 (syz-executor), ts 26457888508, free_ts 25431630195 [ 27.011996][ T375] post_alloc_hook+0x1f5/0x210 [ 27.016761][ T375] prep_new_page+0x1c/0x110 [ 27.021240][ T375] get_page_from_freelist+0x2ca9/0x2d20 [ 27.026766][ T375] __alloc_pages+0x1fa/0x610 [ 27.031413][ T375] alloc_slab_page+0x6e/0xf0 [ 27.036124][ T375] new_slab+0x98/0x3e0 [ 27.040461][ T375] ___slab_alloc+0x70f/0xb70 [ 27.045050][ T375] __slab_alloc+0x5e/0xa0 [ 27.049385][ T375] __kmem_cache_alloc_node+0x204/0x2d0 [ 27.054846][ T375] __kmalloc+0xa4/0x1e0 [ 27.059071][ T375] fib6_info_alloc+0x34/0xe0 [ 27.063737][ T375] ip6_route_info_create+0x51b/0x14d0 [ 27.069122][ T375] ip6_route_add+0x27/0x130 [ 27.073618][ T375] addrconf_prefix_route+0x233/0x310 [ 27.078910][ T375] inet6_addr_add+0x527/0x9c0 [ 27.084013][ T375] inet6_rtm_newaddr+0x74a/0xa10 [ 27.088945][ T375] page last free stack trace: [ 27.093624][ T375] free_unref_page_prepare+0x80c/0x820 [ 27.099089][ T375] free_unref_page+0x93/0x530 [ 27.103751][ T375] __free_pages+0x67/0x100 [ 27.108150][ T375] __vunmap+0xa3c/0xc00 [ 27.112289][ T375] vfree+0x61/0x90 [ 27.115992][ T375] kcov_close+0x2b/0x50 [ 27.120490][ T375] __fput+0x1fd/0x8f0 [ 27.124495][ T375] ____fput+0x15/0x20 [ 27.128481][ T375] task_work_run+0x1e1/0x250 [ 27.133147][ T375] do_exit+0xa7c/0x27c0 [ 27.137770][ T375] do_group_exit+0x21b/0x2e0 [ 27.142342][ T375] get_signal+0x1382/0x14f0 [ 27.146856][ T375] arch_do_signal_or_restart+0xd1/0x11c0 [ 27.152656][ T375] exit_to_user_mode_loop+0x7a/0xb0 [ 27.158219][ T375] exit_to_user_mode_prepare+0x87/0xd0 [ 27.163767][ T375] syscall_exit_to_user_mode+0x1a/0x30 [ 27.169298][ T375] [ 27.171663][ T375] Memory state around the buggy address: [ 27.177411][ T375] ffff888110d6ec00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 27.185635][ T375] ffff888110d6ec80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 27.193766][ T375] >ffff888110d6ed00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 27.201805][ T375] ^ [ 27.208471][ T375] ffff888110d6ed80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 27.216535][ T375] ffff888110d6ee00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 27.224575][ T375] ================================================================== [ 27.233290][ T375] Disabling lock debugging due to kernel taint