syzkaller syzkaller login: [ 8.904405][ T103] udevd (103) used greatest stack depth: 22888 bytes left [ 14.433202][ T30] kauditd_printk_skb: 24 callbacks suppressed [ 14.433220][ T30] audit: type=1400 audit(1785685436.535:59): avc: denied { transition } for pid=223 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 [ 14.445686][ T30] audit: type=1400 audit(1785685436.535:60): avc: denied { noatsecure } for pid=223 comm="sshd-session" scontext=system_u:system_r:sshd_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1 [ 14.459137][ T30] audit: type=1400 audit(1785685436.535:61): avc: denied { write } for pid=223 comm="sh" path="pipe:[14550]" dev="pipefs" ino=14550 scontext=root:sysadm_r:sysadm_t tcontext=system_u:system_r:sshd_t tclass=fifo_file permissive=1 [ 14.482072][ T30] audit: type=1400 audit(1785685436.535:62): avc: denied { rlimitinh } for pid=223 comm="sh" scontext=system_u:system_r:sshd_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1 [ 14.501110][ T30] audit: type=1400 audit(1785685436.535:63): avc: denied { siginh } for pid=223 comm="sh" scontext=system_u:system_r:sshd_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1 [ 16.185597][ T230] sshd-session (230) used greatest stack depth: 22816 bytes left Warning: Permanently added '10.128.1.10' (ED25519) to the list of known hosts. 2026/08/02 15:44:05 parsed 1 programs 2026/08/02 15:44:05 serving rpc on tcp://33353 [ 23.861170][ T30] audit: type=1400 audit(1785685445.965:64): avc: denied { node_bind } for pid=293 comm="syz-execprog" saddr=::1 scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:node_t tclass=tcp_socket permissive=1 [ 23.884309][ T30] audit: type=1400 audit(1785685445.965:65): avc: denied { module_request } for pid=293 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 [ 24.600702][ T30] audit: type=1400 audit(1785685446.695:66): avc: denied { mounton } for pid=299 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 [ 24.601774][ T299] cgroup: Unknown subsys name 'net' [ 24.625726][ T30] audit: type=1400 audit(1785685446.705:67): avc: denied { mount } for pid=299 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 [ 24.653574][ T30] audit: type=1400 audit(1785685446.735:68): avc: denied { unmount } for pid=299 comm="syz-executor" scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:cgroup_t tclass=filesystem permissive=1 [ 24.653767][ T299] cgroup: Unknown subsys name 'devices' [ 24.792691][ T299] cgroup: Unknown subsys name 'hugetlb' [ 24.798702][ T299] cgroup: Unknown subsys name 'rlimit' [ 24.911038][ T30] audit: type=1400 audit(1785685447.015:69): avc: denied { setattr } for pid=299 comm="syz-executor" name="raw-gadget" dev="devtmpfs" ino=254 scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:device_t tclass=chr_file permissive=1 [ 24.935027][ T30] audit: type=1400 audit(1785685447.015:70): avc: denied { create } for pid=299 comm="syz-executor" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=netlink_generic_socket permissive=1 [ 24.956680][ T30] audit: type=1400 audit(1785685447.015:71): avc: denied { write } for pid=299 comm="syz-executor" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=netlink_generic_socket permissive=1 [ 24.977557][ T30] audit: type=1400 audit(1785685447.015:72): avc: denied { read } for pid=299 comm="syz-executor" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=netlink_generic_socket permissive=1 [ 24.983557][ T304] SELinux: Context root:object_r:swapfile_t is not valid (left unmapped). Setting up swapspace version 1, size = 127995904 bytes [ 24.998179][ T30] audit: type=1400 audit(1785685447.015:73): avc: denied { mounton } for pid=299 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 [ 25.045436][ T299] Adding 124996k swap on ./swap-file. Priority:0 extents:1 across:124996k [ 25.498860][ T306] request_module fs-gadgetfs succeeded, but still no fs? [ 26.021487][ T341] syz-executor (341) used greatest stack depth: 21784 bytes left [ 26.143078][ T354] bridge0: port 1(bridge_slave_0) entered blocking state [ 26.150222][ T354] bridge0: port 1(bridge_slave_0) entered disabled state [ 26.158284][ T354] device bridge_slave_0 entered promiscuous mode [ 26.169795][ T354] bridge0: port 2(bridge_slave_1) entered blocking state [ 26.177241][ T354] bridge0: port 2(bridge_slave_1) entered disabled state [ 26.185339][ T354] device bridge_slave_1 entered promiscuous mode [ 26.223996][ T354] bridge0: port 2(bridge_slave_1) entered blocking state [ 26.231199][ T354] bridge0: port 2(bridge_slave_1) entered forwarding state [ 26.238456][ T354] bridge0: port 1(bridge_slave_0) entered blocking state [ 26.245586][ T354] bridge0: port 1(bridge_slave_0) entered forwarding state [ 26.269724][ T334] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 26.277563][ T334] bridge0: port 1(bridge_slave_0) entered disabled state [ 26.285306][ T334] bridge0: port 2(bridge_slave_1) entered disabled state [ 26.294368][ T334] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 26.302818][ T334] bridge0: port 1(bridge_slave_0) entered blocking state [ 26.310087][ T334] bridge0: port 1(bridge_slave_0) entered forwarding state [ 26.323238][ T334] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 26.331476][ T334] bridge0: port 2(bridge_slave_1) entered blocking state [ 26.338614][ T334] bridge0: port 2(bridge_slave_1) entered forwarding state [ 26.350554][ T334] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 26.362730][ T334] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 26.376719][ T334] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready [ 26.392710][ T334] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready [ 26.401627][ T334] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready [ 26.409288][ T334] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready [ 26.418069][ T354] device veth0_vlan entered promiscuous mode [ 26.432715][ T334] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready [ 26.443074][ T354] device veth1_macvtap entered promiscuous mode [ 26.452769][ T334] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready [ 26.468641][ T334] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready [ 26.502407][ T354] syz-executor (354) used greatest stack depth: 20928 bytes left 2026/08/02 15:44:08 executed programs: 0 [ 26.754180][ T368] bridge0: port 1(bridge_slave_0) entered blocking state [ 26.761867][ T368] bridge0: port 1(bridge_slave_0) entered disabled state [ 26.769456][ T368] device bridge_slave_0 entered promiscuous mode [ 26.776826][ T368] bridge0: port 2(bridge_slave_1) entered blocking state [ 26.784324][ T368] bridge0: port 2(bridge_slave_1) entered disabled state [ 26.792305][ T368] device bridge_slave_1 entered promiscuous mode [ 26.827348][ T368] bridge0: port 2(bridge_slave_1) entered blocking state [ 26.835127][ T368] bridge0: port 2(bridge_slave_1) entered forwarding state [ 26.843405][ T368] bridge0: port 1(bridge_slave_0) entered blocking state [ 26.850728][ T368] bridge0: port 1(bridge_slave_0) entered forwarding state [ 26.868084][ T334] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 26.876877][ T334] bridge0: port 1(bridge_slave_0) entered disabled state [ 26.884415][ T334] bridge0: port 2(bridge_slave_1) entered disabled state [ 26.897676][ T334] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 26.906171][ T334] bridge0: port 1(bridge_slave_0) entered blocking state [ 26.913485][ T334] bridge0: port 1(bridge_slave_0) entered forwarding state [ 26.922995][ T334] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 26.932356][ T334] bridge0: port 2(bridge_slave_1) entered blocking state [ 26.939586][ T334] bridge0: port 2(bridge_slave_1) entered forwarding state [ 26.956200][ T334] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 26.965830][ T334] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 26.979261][ T334] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_virt_wifi: link becomes ready [ 26.987672][ T334] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready [ 26.998893][ T334] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_vlan: link becomes ready [ 27.007546][ T334] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready [ 27.015966][ T334] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready [ 27.023476][ T334] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready [ 27.032501][ T368] device veth0_vlan entered promiscuous mode [ 27.045165][ T334] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_macvtap: link becomes ready [ 27.053744][ T334] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready [ 27.063301][ T368] device veth1_macvtap entered promiscuous mode [ 27.071951][ T334] IPv6: ADDRCONF(NETDEV_CHANGE): macsec0: link becomes ready [ 27.079725][ T334] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_0: link becomes ready [ 27.088337][ T334] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready [ 27.098792][ T334] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready [ 27.107374][ T334] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready [ 27.134376][ T372] ================================================================== [ 27.142751][ T372] BUG: KASAN: use-after-free in mutex_lock+0x8e/0x1c0 [ 27.149605][ T372] Write of size 8 at addr ffff88810fb86550 by task syz.2.17/372 [ 27.157311][ T372] [ 27.159757][ T372] CPU: 0 PID: 372 Comm: syz.2.17 Not tainted syzkaller #0 [ 27.166977][ T372] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 [ 27.177026][ T372] Call Trace: [ 27.180308][ T372] [ 27.183399][ T372] __dump_stack+0x21/0x30 [ 27.187751][ T372] dump_stack_lvl+0x110/0x170 [ 27.192453][ T372] ? show_regs_print_info+0x20/0x20 [ 27.198333][ T372] ? load_image+0x3f0/0x3f0 [ 27.202973][ T372] print_address_description+0x7f/0x2c0 [ 27.208556][ T372] ? mutex_lock+0x8e/0x1c0 [ 27.212987][ T372] kasan_report+0x10f/0x150 [ 27.217490][ T372] ? mutex_lock+0x8e/0x1c0 [ 27.221989][ T372] kasan_check_range+0x249/0x2a0 [ 27.227493][ T372] __kasan_check_write+0x14/0x20 [ 27.232441][ T372] mutex_lock+0x8e/0x1c0 [ 27.236704][ T372] ? wait_for_completion_killable_timeout+0x10/0x10 [ 27.243303][ T372] ? l2tp_session_put+0xaf/0x1a0 [ 27.248236][ T372] ? l2tp_session_delete+0x3a9/0x4a0 [ 27.253972][ T372] pppol2tp_release+0x178/0x2b0 [ 27.258832][ T372] sock_close+0xb8/0x200 [ 27.263966][ T372] ? sock_mmap+0xa0/0xa0 [ 27.268852][ T372] __fput+0x22b/0x900 [ 27.272845][ T372] ____fput+0x15/0x20 [ 27.277071][ T372] task_work_run+0x127/0x190 [ 27.282846][ T372] exit_to_user_mode_loop+0xd0/0xe0 [ 27.288223][ T372] exit_to_user_mode_prepare+0x87/0xd0 [ 27.294971][ T372] syscall_exit_to_user_mode+0x1a/0x30 [ 27.300470][ T372] do_syscall_64+0x58/0xa0 [ 27.304990][ T372] ? clear_bhb_loop+0x50/0xa0 [ 27.309700][ T372] ? clear_bhb_loop+0x50/0xa0 [ 27.314366][ T372] entry_SYSCALL_64_after_hwframe+0x66/0xd0 [ 27.320338][ T372] RIP: 0033:0x7fa7fbe9e019 [ 27.324742][ T372] 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 [ 27.345369][ T372] RSP: 002b:00007ffc603e7168 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4 [ 27.354308][ T372] RAX: 0000000000000000 RBX: 00007ffc603e7250 RCX: 00007fa7fbe9e019 [ 27.362283][ T372] RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003 [ 27.370282][ T372] RBP: 00000000000069de R08: 0000000000000001 R09: 0000000000000000 [ 27.379209][ T372] R10: 0000001b32f20000 R11: 0000000000000246 R12: 0000000000000000 [ 27.387181][ T372] R13: 00007fa7fc125fac R14: 00007fa7fc125fa8 R15: 00007fa7fc125fa0 [ 27.395154][ T372] [ 27.398179][ T372] [ 27.400598][ T372] Allocated by task 372: [ 27.405523][ T372] __kasan_kmalloc+0xd4/0x100 [ 27.410682][ T372] __kmalloc+0x13d/0x2c0 [ 27.414930][ T372] l2tp_session_create+0x39/0xb60 [ 27.419942][ T372] pppol2tp_connect+0xbf5/0x1640 [ 27.425108][ T372] __sys_connect+0x3cb/0x450 [ 27.429859][ T372] __x64_sys_connect+0x7a/0x90 [ 27.434712][ T372] x64_sys_call+0x7c/0x9a0 [ 27.439185][ T372] do_syscall_64+0x4c/0xa0 [ 27.443620][ T372] entry_SYSCALL_64_after_hwframe+0x66/0xd0 [ 27.450144][ T372] [ 27.452497][ T372] Freed by task 372: [ 27.456574][ T372] kasan_set_track+0x4a/0x70 [ 27.461438][ T372] kasan_set_free_info+0x23/0x40 [ 27.466937][ T372] ____kasan_slab_free+0x125/0x160 [ 27.472058][ T372] __kasan_slab_free+0x11/0x20 [ 27.476818][ T372] slab_free_freelist_hook+0xc2/0x190 [ 27.482182][ T372] kfree+0xc4/0x270 [ 27.485996][ T372] l2tp_session_put+0xaf/0x1a0 [ 27.490931][ T372] l2tp_session_delete+0x3a9/0x4a0 [ 27.496126][ T372] pppol2tp_release+0x169/0x2b0 [ 27.500978][ T372] sock_close+0xb8/0x200 [ 27.505214][ T372] __fput+0x22b/0x900 [ 27.509191][ T372] ____fput+0x15/0x20 [ 27.513263][ T372] task_work_run+0x127/0x190 [ 27.517848][ T372] exit_to_user_mode_loop+0xd0/0xe0 [ 27.523152][ T372] exit_to_user_mode_prepare+0x87/0xd0 [ 27.528630][ T372] syscall_exit_to_user_mode+0x1a/0x30 [ 27.534199][ T372] do_syscall_64+0x58/0xa0 [ 27.538640][ T372] entry_SYSCALL_64_after_hwframe+0x66/0xd0 [ 27.544565][ T372] [ 27.547334][ T372] The buggy address belongs to the object at ffff88810fb86400 [ 27.547334][ T372] which belongs to the cache kmalloc-512 of size 512 [ 27.564017][ T372] The buggy address is located 336 bytes inside of [ 27.564017][ T372] 512-byte region [ffff88810fb86400, ffff88810fb86600) [ 27.577424][ T372] The buggy address belongs to the page: [ 27.583412][ T372] page:ffffea00043ee100 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10fb84 [ 27.594353][ T372] head:ffffea00043ee100 order:2 compound_mapcount:0 compound_pincount:0 [ 27.602677][ T372] flags: 0x4000000000010200(slab|head|zone=1) [ 27.608749][ T372] raw: 4000000000010200 ffffea000441f000 0000000200000002 ffff888100042f00 [ 27.617332][ T372] raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000 [ 27.626002][ T372] page dumped because: kasan: bad access detected [ 27.632429][ T372] page_owner tracks the page as allocated [ 27.638135][ T372] page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 102, ts 5065149238, free_ts 0 [ 27.656295][ T372] post_alloc_hook+0x192/0x1b0 [ 27.661089][ T372] prep_new_page+0x1c/0x110 [ 27.665604][ T372] get_page_from_freelist+0x2c3a/0x2cd0 [ 27.671168][ T372] __alloc_pages+0x1a2/0x460 [ 27.675860][ T372] new_slab+0xa0/0x4d0 [ 27.680032][ T372] ___slab_alloc+0x3ac/0x840 [ 27.685168][ T372] __slab_alloc+0x49/0x90 [ 27.689503][ T372] __kmalloc_track_caller+0x169/0x2c0 [ 27.694894][ T372] __alloc_skb+0x210/0x730 [ 27.699329][ T372] alloc_uevent_skb+0x85/0x240 [ 27.704180][ T372] kobject_uevent_net_broadcast+0x335/0x5a0 [ 27.710075][ T372] kobject_uevent_env+0x52b/0x700 [ 27.715671][ T372] kobject_synth_uevent+0x457/0x940 [ 27.721227][ T372] store_uevent+0x16/0x30 [ 27.725568][ T372] module_attr_store+0x5f/0x80 [ 27.730436][ T372] sysfs_kf_write+0x129/0x150 [ 27.735138][ T372] page_owner free stack trace missing [ 27.740889][ T372] [ 27.743314][ T372] Memory state around the buggy address: [ 27.748945][ T372] ffff88810fb86400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 27.757937][ T372] ffff88810fb86480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 27.766008][ T372] >ffff88810fb86500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 27.774075][ T372] ^ [ 27.780900][ T372] ffff88810fb86580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 27.789513][ T372] ffff88810fb86600: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 27.798023][ T372] ================================================================== [ 27.806215][ T372] Disabling lock debugging due to kernel taint