syzkaller syzkaller login: [ 14.295957][ T28] kauditd_printk_skb: 31 callbacks suppressed [ 14.295972][ T28] audit: type=1400 audit(1782560229.779:59): avc: denied { transition } for pid=224 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 [ 14.300608][ T28] audit: type=1400 audit(1782560229.779:60): avc: denied { noatsecure } for pid=224 comm="sshd-session" scontext=system_u:system_r:sshd_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1 [ 14.304844][ T28] audit: type=1400 audit(1782560229.789:61): avc: denied { write } for pid=224 comm="sh" path="pipe:[12060]" dev="pipefs" ino=12060 scontext=root:sysadm_r:sysadm_t tcontext=system_u:system_r:sshd_t tclass=fifo_file permissive=1 [ 14.308421][ T28] audit: type=1400 audit(1782560229.789:62): avc: denied { rlimitinh } for pid=224 comm="sh" scontext=system_u:system_r:sshd_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1 [ 14.311450][ T28] audit: type=1400 audit(1782560229.789:63): avc: denied { siginh } for pid=224 comm="sh" scontext=system_u:system_r:sshd_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1 Warning: Permanently added '10.128.1.80' (ED25519) to the list of known hosts. 2026/06/27 11:37:20 parsed 1 programs 2026/06/27 11:37:20 serving rpc on tcp://33459 [ 24.791588][ T28] audit: type=1400 audit(1782560240.269:64): avc: denied { node_bind } for pid=294 comm="syz-execprog" saddr=::1 scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:node_t tclass=tcp_socket permissive=1 [ 24.812358][ T28] audit: type=1400 audit(1782560240.269:65): avc: denied { module_request } for pid=294 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 [ 25.920121][ T28] audit: type=1400 audit(1782560241.399:66): avc: denied { mounton } for pid=300 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 [ 25.923473][ T300] cgroup: Unknown subsys name 'net' [ 25.942803][ T28] audit: type=1400 audit(1782560241.399:67): avc: denied { mount } for pid=300 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 [ 25.970159][ T28] audit: type=1400 audit(1782560241.429:68): avc: denied { unmount } for pid=300 comm="syz-executor" scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:cgroup_t tclass=filesystem permissive=1 [ 25.970633][ T300] cgroup: Unknown subsys name 'devices' [ 26.116409][ T300] cgroup: Unknown subsys name 'hugetlb' [ 26.122046][ T300] cgroup: Unknown subsys name 'rlimit' [ 26.235878][ T28] audit: type=1400 audit(1782560241.719:69): avc: denied { setattr } for pid=300 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 [ 26.259191][ T28] audit: type=1400 audit(1782560241.719:70): avc: denied { create } for pid=300 comm="syz-executor" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=netlink_generic_socket permissive=1 [ 26.279623][ T28] audit: type=1400 audit(1782560241.719:71): avc: denied { write } for pid=300 comm="syz-executor" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=netlink_generic_socket permissive=1 [ 26.299898][ T28] audit: type=1400 audit(1782560241.719:72): avc: denied { read } for pid=300 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 [ 26.320146][ T28] audit: type=1400 audit(1782560241.719:73): avc: denied { mounton } for pid=300 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 [ 26.345512][ T304] SELinux: Context root:object_r:swapfile_t is not valid (left unmapped). [ 26.390184][ T300] Adding 124996k swap on ./swap-file. Priority:0 extents:1 across:124996k [ 27.056503][ T306] request_module fs-gadgetfs succeeded, but still no fs? [ 27.685248][ T346] bridge0: port 1(bridge_slave_0) entered blocking state [ 27.692318][ T346] bridge0: port 1(bridge_slave_0) entered disabled state [ 27.699919][ T346] device bridge_slave_0 entered promiscuous mode [ 27.707004][ T346] bridge0: port 2(bridge_slave_1) entered blocking state [ 27.714110][ T346] bridge0: port 2(bridge_slave_1) entered disabled state [ 27.721527][ T346] device bridge_slave_1 entered promiscuous mode [ 27.767903][ T346] bridge0: port 2(bridge_slave_1) entered blocking state [ 27.774986][ T346] bridge0: port 2(bridge_slave_1) entered forwarding state [ 27.782435][ T346] bridge0: port 1(bridge_slave_0) entered blocking state [ 27.789500][ T346] bridge0: port 1(bridge_slave_0) entered forwarding state [ 27.811058][ T8] bridge0: port 1(bridge_slave_0) entered disabled state [ 27.818423][ T8] bridge0: port 2(bridge_slave_1) entered disabled state [ 27.826169][ T8] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready [ 27.833611][ T8] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 27.842787][ T8] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 27.851344][ T8] bridge0: port 1(bridge_slave_0) entered blocking state [ 27.858444][ T8] bridge0: port 1(bridge_slave_0) entered forwarding state [ 27.867784][ T8] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 27.876146][ T8] bridge0: port 2(bridge_slave_1) entered blocking state [ 27.883176][ T8] bridge0: port 2(bridge_slave_1) entered forwarding state [ 27.896716][ T8] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 27.906293][ T8] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 27.921278][ T8] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready [ 27.939031][ T8] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready [ 27.947271][ T8] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready [ 27.955107][ T8] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready [ 27.963655][ T346] device veth0_vlan entered promiscuous mode [ 27.979491][ T8] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready [ 27.988602][ T346] device veth1_macvtap entered promiscuous mode [ 27.998457][ T8] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready [ 28.008899][ T8] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready [ 28.050724][ T346] syz-executor (346) used greatest stack depth: 21920 bytes left 2026/06/27 11:37:23 executed programs: 0 [ 28.509678][ T370] bridge0: port 1(bridge_slave_0) entered blocking state [ 28.517410][ T370] bridge0: port 1(bridge_slave_0) entered disabled state [ 28.525150][ T370] device bridge_slave_0 entered promiscuous mode [ 28.532218][ T370] bridge0: port 2(bridge_slave_1) entered blocking state [ 28.539363][ T370] bridge0: port 2(bridge_slave_1) entered disabled state [ 28.546800][ T370] device bridge_slave_1 entered promiscuous mode [ 28.592603][ T370] bridge0: port 2(bridge_slave_1) entered blocking state [ 28.599698][ T370] bridge0: port 2(bridge_slave_1) entered forwarding state [ 28.607026][ T370] bridge0: port 1(bridge_slave_0) entered blocking state [ 28.614078][ T370] bridge0: port 1(bridge_slave_0) entered forwarding state [ 28.634371][ T8] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 28.642063][ T8] bridge0: port 1(bridge_slave_0) entered disabled state [ 28.649848][ T8] bridge0: port 2(bridge_slave_1) entered disabled state [ 28.659345][ T8] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 28.668300][ T8] bridge0: port 1(bridge_slave_0) entered blocking state [ 28.675368][ T8] bridge0: port 1(bridge_slave_0) entered forwarding state [ 28.684753][ T8] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 28.693171][ T8] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 28.701395][ T8] bridge0: port 2(bridge_slave_1) entered blocking state [ 28.708451][ T8] bridge0: port 2(bridge_slave_1) entered forwarding state [ 28.725922][ T8] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_hsr: link becomes ready [ 28.734241][ T8] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 28.743586][ T8] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_hsr: link becomes ready [ 28.751774][ T8] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 28.770169][ T8] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_virt_wifi: link becomes ready [ 28.778852][ T8] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready [ 28.790326][ T8] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_vlan: link becomes ready [ 28.798541][ T8] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready [ 28.806777][ T8] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready [ 28.814562][ T8] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready [ 28.822862][ T370] device veth0_vlan entered promiscuous mode [ 28.837275][ T8] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_macvtap: link becomes ready [ 28.845608][ T8] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready [ 28.855081][ T370] device veth1_macvtap entered promiscuous mode [ 28.869018][ T8] IPv6: ADDRCONF(NETDEV_CHANGE): macsec0: link becomes ready [ 28.876822][ T8] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_0: link becomes ready [ 28.885305][ T8] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready [ 28.895403][ T8] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready [ 28.903693][ T8] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready [ 28.930152][ T374] ================================================================== [ 28.938274][ T374] BUG: KASAN: use-after-free in mutex_lock+0x86/0x1b0 [ 28.945082][ T374] Write of size 8 at addr ffff88812c6fc950 by task syz.2.17/374 [ 28.952708][ T374] [ 28.955035][ T374] CPU: 0 PID: 374 Comm: syz.2.17 Not tainted syzkaller #0 [ 28.962140][ T374] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 [ 28.972208][ T374] Call Trace: [ 28.975494][ T374] [ 28.978443][ T374] __dump_stack+0x21/0x24 [ 28.982783][ T374] dump_stack_lvl+0x110/0x170 [ 28.987473][ T374] ? __cfi_dump_stack_lvl+0x8/0x8 [ 28.992500][ T374] ? mutex_lock+0x86/0x1b0 [ 28.996920][ T374] print_address_description+0x71/0x200 [ 29.002468][ T374] print_report+0x4a/0x60 [ 29.006809][ T374] kasan_report+0x122/0x150 [ 29.011323][ T374] ? mutex_lock+0x86/0x1b0 [ 29.015744][ T374] kasan_check_range+0x249/0x2a0 [ 29.020685][ T374] __kasan_check_write+0x14/0x20 [ 29.025620][ T374] mutex_lock+0x86/0x1b0 [ 29.029879][ T374] ? __cfi_mutex_lock+0x10/0x10 [ 29.034742][ T374] ? kfree+0x6f/0xf0 [ 29.038633][ T374] ? l2tp_session_put+0xaf/0x1a0 [ 29.043564][ T374] ? l2tp_session_delete+0x3df/0x4d0 [ 29.048843][ T374] pppol2tp_release+0x178/0x2b0 [ 29.053702][ T374] sock_close+0xc9/0x220 [ 29.057946][ T374] ? __cfi_sock_close+0x10/0x10 [ 29.062802][ T374] __fput+0x1fd/0x8f0 [ 29.066790][ T374] ____fput+0x15/0x20 [ 29.070773][ T374] task_work_run+0x1e1/0x250 [ 29.075370][ T374] ? __cfi_task_work_run+0x10/0x10 [ 29.080503][ T374] ? __cfi___close_range+0x10/0x10 [ 29.085615][ T374] exit_to_user_mode_loop+0x9b/0xb0 [ 29.090812][ T374] exit_to_user_mode_prepare+0x87/0xd0 [ 29.096264][ T374] syscall_exit_to_user_mode+0x1a/0x30 [ 29.101737][ T374] do_syscall_64+0x58/0xa0 [ 29.106165][ T374] ? clear_bhb_loop+0x30/0x80 [ 29.110844][ T374] ? clear_bhb_loop+0x30/0x80 [ 29.115514][ T374] entry_SYSCALL_64_after_hwframe+0x68/0xd2 [ 29.121418][ T374] RIP: 0033:0x7fb74479ce59 [ 29.125848][ T374] 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 [ 29.145474][ T374] RSP: 002b:00007ffcf9fe77f8 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4 [ 29.153905][ T374] RAX: 0000000000000000 RBX: 00007ffcf9fe78e0 RCX: 00007fb74479ce59 [ 29.161889][ T374] RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003 [ 29.169853][ T374] RBP: 00000000000070de R08: 0000000000000001 R09: 0000000000000000 [ 29.177822][ T374] R10: 0000001b33120000 R11: 0000000000000246 R12: 0000000000000000 [ 29.185793][ T374] R13: 00007fb744a15fac R14: 00007fb744a15fa8 R15: 00007fb744a15fa0 [ 29.193764][ T374] [ 29.196792][ T374] [ 29.199106][ T374] Allocated by task 374: [ 29.203344][ T374] kasan_set_track+0x4b/0x70 [ 29.207942][ T374] kasan_save_alloc_info+0x1f/0x30 [ 29.213053][ T374] __kasan_kmalloc+0x95/0xb0 [ 29.217646][ T374] __kmalloc+0xb4/0x1e0 [ 29.221799][ T374] l2tp_session_create+0x38/0xbd0 [ 29.226822][ T374] pppol2tp_connect+0xbf5/0x1640 [ 29.231760][ T374] __sys_connect+0x3da/0x460 [ 29.236346][ T374] __x64_sys_connect+0x7a/0x90 [ 29.241107][ T374] x64_sys_call+0x88d/0x9a0 [ 29.245610][ T374] do_syscall_64+0x4c/0xa0 [ 29.250035][ T374] entry_SYSCALL_64_after_hwframe+0x68/0xd2 [ 29.255930][ T374] [ 29.258252][ T374] Freed by task 374: [ 29.262138][ T374] kasan_set_track+0x4b/0x70 [ 29.266725][ T374] kasan_save_free_info+0x2b/0x40 [ 29.271745][ T374] ____kasan_slab_free+0x132/0x180 [ 29.276862][ T374] __kasan_slab_free+0x11/0x20 [ 29.281627][ T374] slab_free_freelist_hook+0xc2/0x190 [ 29.286991][ T374] __kmem_cache_free+0xb7/0x1b0 [ 29.291843][ T374] kfree+0x6f/0xf0 [ 29.295556][ T374] l2tp_session_put+0xaf/0x1a0 [ 29.300312][ T374] l2tp_session_delete+0x3df/0x4d0 [ 29.305415][ T374] pppol2tp_release+0x169/0x2b0 [ 29.310263][ T374] sock_close+0xc9/0x220 [ 29.314517][ T374] __fput+0x1fd/0x8f0 [ 29.318502][ T374] ____fput+0x15/0x20 [ 29.322483][ T374] task_work_run+0x1e1/0x250 [ 29.327073][ T374] exit_to_user_mode_loop+0x9b/0xb0 [ 29.332270][ T374] exit_to_user_mode_prepare+0x87/0xd0 [ 29.337723][ T374] syscall_exit_to_user_mode+0x1a/0x30 [ 29.343180][ T374] do_syscall_64+0x58/0xa0 [ 29.347610][ T374] entry_SYSCALL_64_after_hwframe+0x68/0xd2 [ 29.353523][ T374] [ 29.355843][ T374] The buggy address belongs to the object at ffff88812c6fc800 [ 29.355843][ T374] which belongs to the cache kmalloc-512 of size 512 [ 29.369887][ T374] The buggy address is located 336 bytes inside of [ 29.369887][ T374] 512-byte region [ffff88812c6fc800, ffff88812c6fca00) [ 29.383181][ T374] [ 29.385503][ T374] The buggy address belongs to the physical page: [ 29.391914][ T374] page:ffffea0004b1bf00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x12c6fc [ 29.402167][ T374] head:ffffea0004b1bf00 order:2 compound_mapcount:0 compound_pincount:0 [ 29.410485][ T374] flags: 0x4000000000010200(slab|head|zone=1) [ 29.416564][ T374] raw: 4000000000010200 0000000000000000 dead000000000122 ffff888100042f00 [ 29.425144][ T374] raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000 [ 29.433725][ T374] page dumped because: kasan: bad access detected [ 29.440125][ T374] page_owner tracks the page as allocated [ 29.445829][ T374] 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 28923025077, free_ts 28257837867 [ 29.468395][ T374] post_alloc_hook+0x1f5/0x210 [ 29.473163][ T374] prep_new_page+0x1c/0x110 [ 29.477685][ T374] get_page_from_freelist+0x2ca9/0x2d20 [ 29.483244][ T374] __alloc_pages+0x1fa/0x610 [ 29.487844][ T374] alloc_slab_page+0x6e/0xf0 [ 29.492441][ T374] new_slab+0x98/0x3e0 [ 29.496524][ T374] ___slab_alloc+0x70f/0xb70 [ 29.501119][ T374] __slab_alloc+0x5e/0xa0 [ 29.505453][ T374] __kmem_cache_alloc_node+0x204/0x2d0 [ 29.510912][ T374] kmalloc_trace+0x29/0xb0 [ 29.515337][ T374] find_css_set+0x937/0x15c0 [ 29.519920][ T374] cgroup_migrate_prepare_dst+0xc4/0xa00 [ 29.525553][ T374] cgroup_attach_task+0x298/0x520 [ 29.530666][ T374] __cgroup1_procs_write+0x314/0x520 [ 29.535950][ T374] cgroup1_procs_write+0x2a/0x40 [ 29.540901][ T374] cgroup_file_write+0x2a2/0x590 [ 29.545838][ T374] page last free stack trace: [ 29.550505][ T374] free_unref_page_prepare+0x80c/0x820 [ 29.555986][ T374] free_unref_page+0x93/0x530 [ 29.560662][ T374] __free_pages+0x67/0x100 [ 29.565082][ T374] __vunmap+0xa3c/0xc00 [ 29.569232][ T374] vfree+0x61/0x90 [ 29.572947][ T374] kcov_close+0x2b/0x50 [ 29.577113][ T374] __fput+0x1fd/0x8f0 [ 29.581096][ T374] ____fput+0x15/0x20 [ 29.585074][ T374] task_work_run+0x1e1/0x250 [ 29.589666][ T374] do_exit+0xaf2/0x2850 [ 29.593835][ T374] do_group_exit+0x21b/0x2e0 [ 29.598459][ T374] get_signal+0x1382/0x14f0 [ 29.602970][ T374] arch_do_signal_or_restart+0xd1/0x11c0 [ 29.608608][ T374] exit_to_user_mode_loop+0x7a/0xb0 [ 29.613800][ T374] exit_to_user_mode_prepare+0x87/0xd0 [ 29.619258][ T374] syscall_exit_to_user_mode+0x1a/0x30 [ 29.624734][ T374] [ 29.627069][ T374] Memory state around the buggy address: [ 29.632695][ T374] ffff88812c6fc800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 29.640764][ T374] ffff88812c6fc880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 29.648825][ T374] >ffff88812c6fc900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 29.656891][ T374] ^ [ 29.663556][ T374] ffff88812c6fc980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 29.671610][ T374] ffff88812c6fca00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 29.679666][ T374] ================================================================== [ 29.693850][ T374] Disabling lock debugging due to kernel taint