syzkaller syzkaller login: [ 14.522518][ T28] kauditd_printk_skb: 48 callbacks suppressed [ 14.522530][ T28] audit: type=1400 audit(1781163152.807:59): 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 [ 14.526473][ T28] audit: type=1400 audit(1781163152.807:60): 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 [ 14.529332][ T28] audit: type=1400 audit(1781163152.807:61): avc: denied { write } for pid=225 comm="sh" path="pipe:[12738]" dev="pipefs" ino=12738 scontext=root:sysadm_r:sysadm_t tcontext=system_u:system_r:sshd_t tclass=fifo_file permissive=1 [ 14.532319][ T28] audit: type=1400 audit(1781163152.807:62): 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 [ 14.534915][ T28] audit: type=1400 audit(1781163152.807:63): 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 '10.128.1.83' (ED25519) to the list of known hosts. 2026/06/11 07:32:41 parsed 1 programs [ 23.391752][ T28] audit: type=1400 audit(1781163161.677:64): 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 [ 23.412488][ T28] audit: type=1400 audit(1781163161.677:65): 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 [ 24.108845][ T28] audit: type=1400 audit(1781163162.387:66): avc: denied { mounton } for pid=301 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 [ 24.109868][ T301] cgroup: Unknown subsys name 'net' [ 24.131510][ T28] audit: type=1400 audit(1781163162.397:67): avc: denied { mount } for pid=301 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 [ 24.158712][ T28] audit: type=1400 audit(1781163162.417:68): avc: denied { unmount } for pid=301 comm="syz-executor" scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:cgroup_t tclass=filesystem permissive=1 [ 24.158992][ T301] cgroup: Unknown subsys name 'devices' [ 24.300757][ T301] cgroup: Unknown subsys name 'hugetlb' [ 24.306339][ T301] cgroup: Unknown subsys name 'rlimit' [ 24.413328][ T28] audit: type=1400 audit(1781163162.697:69): avc: denied { setattr } for pid=301 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 [ 24.436477][ T28] audit: type=1400 audit(1781163162.697:70): avc: denied { create } for pid=301 comm="syz-executor" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=netlink_generic_socket permissive=1 [ 24.456946][ T28] audit: type=1400 audit(1781163162.697:71): avc: denied { write } for pid=301 comm="syz-executor" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=netlink_generic_socket permissive=1 [ 24.457097][ T305] SELinux: Context root:object_r:swapfile_t is not valid (left unmapped). [ 24.477310][ T28] audit: type=1400 audit(1781163162.697:72): avc: denied { read } for pid=301 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 [ 24.505867][ T28] audit: type=1400 audit(1781163162.697:73): avc: denied { mounton } for pid=301 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 [ 24.535472][ T301] Adding 124996k swap on ./swap-file. Priority:0 extents:1 across:124996k [ 25.186397][ T311] request_module fs-gadgetfs succeeded, but still no fs? [ 25.456439][ T336] bridge0: port 1(bridge_slave_0) entered blocking state [ 25.463509][ T336] bridge0: port 1(bridge_slave_0) entered disabled state [ 25.471132][ T336] device bridge_slave_0 entered promiscuous mode [ 25.478151][ T336] bridge0: port 2(bridge_slave_1) entered blocking state [ 25.485243][ T336] bridge0: port 2(bridge_slave_1) entered disabled state [ 25.492520][ T336] device bridge_slave_1 entered promiscuous mode [ 25.528713][ T336] bridge0: port 2(bridge_slave_1) entered blocking state [ 25.535752][ T336] bridge0: port 2(bridge_slave_1) entered forwarding state [ 25.543015][ T336] bridge0: port 1(bridge_slave_0) entered blocking state [ 25.550035][ T336] bridge0: port 1(bridge_slave_0) entered forwarding state [ 25.559699][ T332] syz-executor (332) used greatest stack depth: 22400 bytes left [ 25.571597][ T43] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 25.579457][ T43] bridge0: port 1(bridge_slave_0) entered disabled state [ 25.586597][ T43] bridge0: port 2(bridge_slave_1) entered disabled state [ 25.595330][ T43] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 25.603959][ T43] bridge0: port 1(bridge_slave_0) entered blocking state [ 25.610981][ T43] bridge0: port 1(bridge_slave_0) entered forwarding state [ 25.620215][ T43] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 25.628278][ T43] bridge0: port 2(bridge_slave_1) entered blocking state [ 25.635298][ T43] bridge0: port 2(bridge_slave_1) entered forwarding state [ 25.645982][ T43] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 25.655008][ T43] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 25.667340][ T43] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready [ 25.678724][ T43] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready [ 25.686765][ T43] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready [ 25.694356][ T43] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready [ 25.702580][ T336] device veth0_vlan entered promiscuous mode [ 25.713910][ T43] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready [ 25.723024][ T336] device veth1_macvtap entered promiscuous mode [ 25.731688][ T43] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready [ 25.741428][ T43] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready [ 25.776561][ T336] syz-executor (336) used greatest stack depth: 22016 bytes left 2026/06/11 07:32:44 executed programs: 0 [ 26.221695][ T370] bridge0: port 1(bridge_slave_0) entered blocking state [ 26.228741][ T370] bridge0: port 1(bridge_slave_0) entered disabled state [ 26.236136][ T370] device bridge_slave_0 entered promiscuous mode [ 26.242846][ T370] bridge0: port 2(bridge_slave_1) entered blocking state [ 26.249981][ T370] bridge0: port 2(bridge_slave_1) entered disabled state [ 26.257362][ T370] device bridge_slave_1 entered promiscuous mode [ 26.295867][ T370] bridge0: port 2(bridge_slave_1) entered blocking state [ 26.302908][ T370] bridge0: port 2(bridge_slave_1) entered forwarding state [ 26.310153][ T370] bridge0: port 1(bridge_slave_0) entered blocking state [ 26.317159][ T370] bridge0: port 1(bridge_slave_0) entered forwarding state [ 26.333818][ T341] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 26.341282][ T341] bridge0: port 1(bridge_slave_0) entered disabled state [ 26.348369][ T341] bridge0: port 2(bridge_slave_1) entered disabled state [ 26.361692][ T341] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 26.369830][ T341] bridge0: port 1(bridge_slave_0) entered blocking state [ 26.376828][ T341] bridge0: port 1(bridge_slave_0) entered forwarding state [ 26.385253][ T341] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 26.393467][ T341] bridge0: port 2(bridge_slave_1) entered blocking state [ 26.400485][ T341] bridge0: port 2(bridge_slave_1) entered forwarding state [ 26.415829][ T341] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 26.424684][ T341] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_hsr: link becomes ready [ 26.432784][ T341] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 26.444813][ T341] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_virt_wifi: link becomes ready [ 26.453123][ T341] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready [ 26.463470][ T341] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_vlan: link becomes ready [ 26.471412][ T341] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready [ 26.480021][ T341] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready [ 26.487452][ T341] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready [ 26.497142][ T370] device veth0_vlan entered promiscuous mode [ 26.506262][ T341] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_macvtap: link becomes ready [ 26.514442][ T341] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready [ 26.523300][ T370] device veth1_macvtap entered promiscuous mode [ 26.532125][ T341] IPv6: ADDRCONF(NETDEV_CHANGE): macsec0: link becomes ready [ 26.540068][ T341] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_0: link becomes ready [ 26.548174][ T341] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready [ 26.560829][ T341] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready [ 26.569179][ T341] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready [ 26.589873][ T374] ================================================================== [ 26.597949][ T374] BUG: KASAN: use-after-free in mutex_lock+0x86/0x1b0 [ 26.604693][ T374] Write of size 8 at addr ffff88812d82d550 by task syz.2.17/374 [ 26.612292][ T374] [ 26.614596][ T374] CPU: 1 PID: 374 Comm: syz.2.17 Not tainted syzkaller #0 [ 26.621674][ T374] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026 [ 26.631710][ T374] Call Trace: [ 26.634965][ T374] [ 26.637870][ T374] __dump_stack+0x21/0x24 [ 26.642183][ T374] dump_stack_lvl+0x110/0x170 [ 26.646832][ T374] ? __cfi_dump_stack_lvl+0x8/0x8 [ 26.651835][ T374] ? mutex_lock+0x86/0x1b0 [ 26.656340][ T374] print_address_description+0x71/0x200 [ 26.661861][ T374] print_report+0x4a/0x60 [ 26.666168][ T374] kasan_report+0x122/0x150 [ 26.670646][ T374] ? mutex_lock+0x86/0x1b0 [ 26.675041][ T374] kasan_check_range+0x249/0x2a0 [ 26.679953][ T374] __kasan_check_write+0x14/0x20 [ 26.684863][ T374] mutex_lock+0x86/0x1b0 [ 26.689085][ T374] ? __cfi_mutex_lock+0x10/0x10 [ 26.693911][ T374] ? l2tp_session_put+0xaf/0x1a0 [ 26.698830][ T374] ? l2tp_session_delete+0x3f0/0x4e0 [ 26.704089][ T374] pppol2tp_release+0x194/0x2d0 [ 26.708921][ T374] sock_close+0xf1/0x290 [ 26.713149][ T374] ? __cfi_sock_close+0x10/0x10 [ 26.717972][ T374] __fput+0x1fc/0x8f0 [ 26.721927][ T374] ____fput+0x15/0x20 [ 26.725884][ T374] task_work_run+0x1e1/0x250 [ 26.730445][ T374] ? __cfi_task_work_run+0x10/0x10 [ 26.735529][ T374] ? __cfi___close_range+0x10/0x10 [ 26.740613][ T374] exit_to_user_mode_loop+0x9b/0xb0 [ 26.745785][ T374] exit_to_user_mode_prepare+0x87/0xd0 [ 26.751215][ T374] syscall_exit_to_user_mode+0x1a/0x30 [ 26.756650][ T374] do_syscall_64+0x58/0xa0 [ 26.761040][ T374] ? clear_bhb_loop+0x30/0x80 [ 26.765695][ T374] ? clear_bhb_loop+0x30/0x80 [ 26.770340][ T374] entry_SYSCALL_64_after_hwframe+0x68/0xd2 [ 26.776208][ T374] RIP: 0033:0x7fc48af9ce59 [ 26.780596][ 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 [ 26.800175][ T374] RSP: 002b:00007fffdc160b68 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4 [ 26.808572][ T374] RAX: 0000000000000000 RBX: 00007fffdc160c50 RCX: 00007fc48af9ce59 [ 26.816517][ T374] RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003 [ 26.824464][ T374] RBP: 00000000000067d3 R08: 0000000000000001 R09: 0000000000000000 [ 26.832408][ T374] R10: 0000001b33120000 R11: 0000000000000246 R12: 0000000000000000 [ 26.840353][ T374] R13: 00007fc48b215fac R14: 00007fc48b215fa8 R15: 00007fc48b215fa0 [ 26.848395][ T374] [ 26.851390][ T374] [ 26.853694][ T374] Allocated by task 374: [ 26.857914][ T374] kasan_set_track+0x4b/0x70 [ 26.862480][ T374] kasan_save_alloc_info+0x25/0x30 [ 26.867567][ T374] __kasan_kmalloc+0x95/0xb0 [ 26.872131][ T374] __kmalloc+0xb1/0x1e0 [ 26.876258][ T374] l2tp_session_create+0x38/0xbe0 [ 26.881254][ T374] pppol2tp_connect+0xbef/0x1620 [ 26.886164][ T374] __sys_connect+0x3da/0x460 [ 26.890723][ T374] __x64_sys_connect+0x7a/0x90 [ 26.895457][ T374] x64_sys_call+0x88d/0x9a0 [ 26.899933][ T374] do_syscall_64+0x4c/0xa0 [ 26.904331][ T374] entry_SYSCALL_64_after_hwframe+0x68/0xd2 [ 26.910208][ T374] [ 26.912508][ T374] Freed by task 374: [ 26.916373][ T374] kasan_set_track+0x4b/0x70 [ 26.920941][ T374] kasan_save_free_info+0x31/0x50 [ 26.925949][ T374] ____kasan_slab_free+0x132/0x180 [ 26.931041][ T374] __kasan_slab_free+0x11/0x20 [ 26.935783][ T374] slab_free_freelist_hook+0xc2/0x190 [ 26.941133][ T374] __kmem_cache_free+0xb7/0x1b0 [ 26.945964][ T374] kfree+0x6f/0xf0 [ 26.949663][ T374] l2tp_session_put+0xaf/0x1a0 [ 26.954403][ T374] l2tp_session_delete+0x3f0/0x4e0 [ 26.959490][ T374] pppol2tp_release+0x185/0x2d0 [ 26.964323][ T374] sock_close+0xf1/0x290 [ 26.968548][ T374] __fput+0x1fc/0x8f0 [ 26.972508][ T374] ____fput+0x15/0x20 [ 26.976477][ T374] task_work_run+0x1e1/0x250 [ 26.981049][ T374] exit_to_user_mode_loop+0x9b/0xb0 [ 26.986226][ T374] exit_to_user_mode_prepare+0x87/0xd0 [ 26.991659][ T374] syscall_exit_to_user_mode+0x1a/0x30 [ 26.997093][ T374] do_syscall_64+0x58/0xa0 [ 27.001490][ T374] entry_SYSCALL_64_after_hwframe+0x68/0xd2 [ 27.007367][ T374] [ 27.009669][ T374] The buggy address belongs to the object at ffff88812d82d400 [ 27.009669][ T374] which belongs to the cache kmalloc-512 of size 512 [ 27.023695][ T374] The buggy address is located 336 bytes inside of [ 27.023695][ T374] 512-byte region [ffff88812d82d400, ffff88812d82d600) [ 27.036945][ T374] [ 27.039254][ T374] The buggy address belongs to the physical page: [ 27.045645][ T374] page:ffffea0004b60b00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x12d82c [ 27.055861][ T374] head:ffffea0004b60b00 order:2 compound_mapcount:0 compound_pincount:0 [ 27.064161][ T374] flags: 0x4000000000010200(slab|head|zone=1) [ 27.070211][ T374] raw: 4000000000010200 0000000000000000 dead000000000122 ffff888100042f00 [ 27.078768][ T374] raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000 [ 27.087322][ T374] page dumped because: kasan: bad access detected [ 27.093712][ T374] page_owner tracks the page as allocated [ 27.099397][ T374] page last allocated via order 2, migratetype Unmovable, gfp_mask 0x1d2a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 60, tgid 60 (kworker/1:2), ts 26581019118, free_ts 25883776141 [ 27.121083][ T374] post_alloc_hook+0x1f5/0x210 [ 27.125838][ T374] prep_new_page+0x1c/0x110 [ 27.130325][ T374] get_page_from_freelist+0x2d12/0x2d80 [ 27.135855][ T374] __alloc_pages+0x1fa/0x610 [ 27.140429][ T374] alloc_slab_page+0x6e/0xf0 [ 27.144995][ T374] new_slab+0x98/0x3d0 [ 27.149040][ T374] ___slab_alloc+0x6bd/0xb20 [ 27.153610][ T374] __slab_alloc+0x5e/0xa0 [ 27.157922][ T374] __kmem_cache_alloc_node+0x203/0x2c0 [ 27.163359][ T374] __kmalloc_node_track_caller+0xa0/0x1e0 [ 27.169056][ T374] __alloc_skb+0x236/0x4b0 [ 27.173447][ T374] __ipv6_ifa_notify+0x200/0xe80 [ 27.178362][ T374] addrconf_dad_completed+0x190/0xe80 [ 27.183710][ T374] addrconf_dad_work+0xc41/0x14d0 [ 27.188711][ T374] process_one_work+0x71f/0xc40 [ 27.193536][ T374] worker_thread+0xa29/0x11e0 [ 27.198190][ T374] page last free stack trace: [ 27.202843][ T374] free_unref_page_prepare+0x7f8/0x800 [ 27.208282][ T374] free_unref_page+0x95/0x540 [ 27.212938][ T374] __free_pages+0x67/0x100 [ 27.217332][ T374] __vunmap+0x9c0/0xb80 [ 27.221464][ T374] vfree+0x61/0x90 [ 27.225168][ T374] kcov_close+0x2b/0x50 [ 27.229319][ T374] __fput+0x1fc/0x8f0 [ 27.233285][ T374] ____fput+0x15/0x20 [ 27.237250][ T374] task_work_run+0x1e1/0x250 [ 27.241823][ T374] do_exit+0xa35/0x2660 [ 27.245977][ T374] do_group_exit+0x225/0x2e0 [ 27.250553][ T374] get_signal+0x13b5/0x1520 [ 27.255053][ T374] arch_do_signal_or_restart+0xd1/0x1140 [ 27.260674][ T374] exit_to_user_mode_loop+0x7a/0xb0 [ 27.265852][ T374] exit_to_user_mode_prepare+0x87/0xd0 [ 27.271297][ T374] syscall_exit_to_user_mode+0x1a/0x30 [ 27.276742][ T374] [ 27.279046][ T374] Memory state around the buggy address: [ 27.284654][ T374] ffff88812d82d400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 27.292695][ T374] ffff88812d82d480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 27.300732][ T374] >ffff88812d82d500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 27.308765][ T374] ^ [ 27.315412][ T374] ffff88812d82d580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 27.323450][ T374] ffff88812d82d600: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 27.331488][ T374] ================================================================== [ 27.344368][ T374] Disabling lock debugging due to kernel taint