syzkaller syzkaller login: [ 7.976869][ T103] udevd (103) used greatest stack depth: 22888 bytes left [ 15.124590][ T30] audit: type=1400 audit(1783579921.510:59): 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 [ 15.132507][ T30] audit: type=1400 audit(1783579921.510:60): 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 [ 15.139683][ T30] audit: type=1400 audit(1783579921.520:61): avc: denied { write } for pid=223 comm="sh" path="pipe:[14680]" dev="pipefs" ino=14680 scontext=root:sysadm_r:sysadm_t tcontext=system_u:system_r:sshd_t tclass=fifo_file permissive=1 [ 15.151729][ T30] audit: type=1400 audit(1783579921.520:62): 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 [ 15.156397][ T220] sshd-session (220) used greatest stack depth: 22184 bytes left [ 15.177341][ T30] audit: type=1400 audit(1783579921.520:63): 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 [ 16.877589][ T230] sshd-session (230) used greatest stack depth: 21312 bytes left Warning: Permanently added '10.128.0.141' (ED25519) to the list of known hosts. 2026/07/09 06:52:11 parsed 1 programs 2026/07/09 06:52:11 serving rpc on tcp://35599 [ 24.815594][ T30] audit: type=1400 audit(1783579931.200:64): 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 [ 24.836482][ T30] audit: type=1400 audit(1783579931.210:65): 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 [ 25.553802][ T30] audit: type=1400 audit(1783579931.940:66): 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 [ 25.555173][ T299] cgroup: Unknown subsys name 'net' [ 25.576594][ T30] audit: type=1400 audit(1783579931.940:67): 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 [ 25.603870][ T30] audit: type=1400 audit(1783579931.970:68): 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 [ 25.604007][ T299] cgroup: Unknown subsys name 'devices' [ 25.688191][ T299] cgroup: Unknown subsys name 'hugetlb' [ 25.693792][ T299] cgroup: Unknown subsys name 'rlimit' [ 25.804883][ T30] audit: type=1400 audit(1783579932.190:69): 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 [ 25.828065][ T30] audit: type=1400 audit(1783579932.190:70): 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 [ 25.848484][ T30] audit: type=1400 audit(1783579932.190:71): 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 [ 25.854640][ T303] SELinux: Context root:object_r:swapfile_t is not valid (left unmapped). [ 25.868763][ T30] audit: type=1400 audit(1783579932.190:72): 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 Setting up swapspace version 1, size = 127995904 bytes [ 25.897535][ T30] audit: type=1400 audit(1783579932.200:73): 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 [ 25.935271][ T299] Adding 124996k swap on ./swap-file. Priority:0 extents:1 across:124996k [ 26.438739][ T305] request_module fs-gadgetfs succeeded, but still no fs? [ 26.800921][ T333] bridge0: port 1(bridge_slave_0) entered blocking state [ 26.808031][ T333] bridge0: port 1(bridge_slave_0) entered disabled state [ 26.815349][ T333] device bridge_slave_0 entered promiscuous mode [ 26.822182][ T333] bridge0: port 2(bridge_slave_1) entered blocking state [ 26.829227][ T333] bridge0: port 2(bridge_slave_1) entered disabled state [ 26.836650][ T333] device bridge_slave_1 entered promiscuous mode [ 26.873352][ T333] bridge0: port 2(bridge_slave_1) entered blocking state [ 26.880411][ T333] bridge0: port 2(bridge_slave_1) entered forwarding state [ 26.887724][ T333] bridge0: port 1(bridge_slave_0) entered blocking state [ 26.894785][ T333] bridge0: port 1(bridge_slave_0) entered forwarding state [ 26.911815][ T10] bridge0: port 1(bridge_slave_0) entered disabled state [ 26.919217][ T10] bridge0: port 2(bridge_slave_1) entered disabled state [ 26.926660][ T10] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready [ 26.934059][ T10] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 26.943586][ T10] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 26.951921][ T10] bridge0: port 1(bridge_slave_0) entered blocking state [ 26.959002][ T10] bridge0: port 1(bridge_slave_0) entered forwarding state [ 26.967711][ T10] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 26.976087][ T10] bridge0: port 2(bridge_slave_1) entered blocking state [ 26.983126][ T10] bridge0: port 2(bridge_slave_1) entered forwarding state [ 26.995015][ T10] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 27.004089][ T10] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 27.023549][ T10] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready [ 27.033971][ T333] device veth0_vlan entered promiscuous mode [ 27.040585][ T10] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready [ 27.048733][ T10] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready [ 27.056715][ T10] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready [ 27.067685][ T10] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready [ 27.076671][ T333] device veth1_macvtap entered promiscuous mode [ 27.085166][ T10] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready [ 27.094948][ T10] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready 2026/07/09 06:52:13 executed programs: 0 [ 27.544641][ T369] bridge0: port 1(bridge_slave_0) entered blocking state [ 27.551747][ T369] bridge0: port 1(bridge_slave_0) entered disabled state [ 27.560664][ T369] device bridge_slave_0 entered promiscuous mode [ 27.567934][ T369] bridge0: port 2(bridge_slave_1) entered blocking state [ 27.574971][ T369] bridge0: port 2(bridge_slave_1) entered disabled state [ 27.582481][ T369] device bridge_slave_1 entered promiscuous mode [ 27.621876][ T369] bridge0: port 2(bridge_slave_1) entered blocking state [ 27.628946][ T369] bridge0: port 2(bridge_slave_1) entered forwarding state [ 27.636259][ T369] bridge0: port 1(bridge_slave_0) entered blocking state [ 27.643285][ T369] bridge0: port 1(bridge_slave_0) entered forwarding state [ 27.664734][ T10] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 27.672546][ T10] bridge0: port 1(bridge_slave_0) entered disabled state [ 27.680013][ T10] bridge0: port 2(bridge_slave_1) entered disabled state [ 27.688997][ T10] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 27.697247][ T10] bridge0: port 1(bridge_slave_0) entered blocking state [ 27.704341][ T10] bridge0: port 1(bridge_slave_0) entered forwarding state [ 27.715702][ T10] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 27.724037][ T10] bridge0: port 2(bridge_slave_1) entered blocking state [ 27.731103][ T10] bridge0: port 2(bridge_slave_1) entered forwarding state [ 27.742732][ T10] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 27.752097][ T10] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 27.769239][ T10] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready [ 27.781385][ T369] device veth0_vlan entered promiscuous mode [ 27.788738][ T10] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready [ 27.797335][ T10] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready [ 27.804750][ T10] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready [ 27.815338][ T10] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_macvtap: link becomes ready [ 27.823560][ T10] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready [ 27.833404][ T369] device veth1_macvtap entered promiscuous mode [ 27.842999][ T10] IPv6: ADDRCONF(NETDEV_CHANGE): macsec0: link becomes ready [ 27.851113][ T10] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_0: link becomes ready [ 27.859789][ T10] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready [ 27.870950][ T10] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready [ 27.879268][ T10] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready [ 27.902993][ T374] ================================================================== [ 27.911095][ T374] BUG: KASAN: use-after-free in mutex_lock+0x8e/0x1c0 [ 27.917880][ T374] Write of size 8 at addr ffff88812b448d50 by task syz.2.17/374 [ 27.925516][ T374] [ 27.927827][ T374] CPU: 0 PID: 374 Comm: syz.2.17 Not tainted syzkaller #0 [ 27.934929][ T374] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 [ 27.944975][ T374] Call Trace: [ 27.948243][ T374] [ 27.951161][ T374] __dump_stack+0x21/0x30 [ 27.955477][ T374] dump_stack_lvl+0x110/0x170 [ 27.960151][ T374] ? show_regs_print_info+0x20/0x20 [ 27.965335][ T374] ? load_image+0x3f0/0x3f0 [ 27.969836][ T374] print_address_description+0x7f/0x2c0 [ 27.975390][ T374] ? mutex_lock+0x8e/0x1c0 [ 27.979989][ T374] kasan_report+0x10f/0x150 [ 27.984504][ T374] ? mutex_lock+0x8e/0x1c0 [ 27.988924][ T374] kasan_check_range+0x249/0x2a0 [ 27.993846][ T374] __kasan_check_write+0x14/0x20 [ 27.998785][ T374] mutex_lock+0x8e/0x1c0 [ 28.003017][ T374] ? wait_for_completion_killable_timeout+0x10/0x10 [ 28.009589][ T374] ? l2tp_session_put+0xaf/0x1a0 [ 28.014525][ T374] ? l2tp_session_delete+0x3a9/0x4a0 [ 28.019812][ T374] pppol2tp_release+0x178/0x2b0 [ 28.024660][ T374] sock_close+0xb8/0x200 [ 28.028887][ T374] ? sock_mmap+0xa0/0xa0 [ 28.033113][ T374] __fput+0x22b/0x900 [ 28.037086][ T374] ____fput+0x15/0x20 [ 28.041055][ T374] task_work_run+0x127/0x190 [ 28.045640][ T374] exit_to_user_mode_loop+0xd0/0xe0 [ 28.050831][ T374] exit_to_user_mode_prepare+0x87/0xd0 [ 28.056284][ T374] syscall_exit_to_user_mode+0x1a/0x30 [ 28.061744][ T374] do_syscall_64+0x58/0xa0 [ 28.066148][ T374] ? clear_bhb_loop+0x50/0xa0 [ 28.070811][ T374] ? clear_bhb_loop+0x50/0xa0 [ 28.075482][ T374] entry_SYSCALL_64_after_hwframe+0x66/0xd0 [ 28.081359][ T374] RIP: 0033:0x7f3c5fd52e59 [ 28.085761][ 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 [ 28.105381][ T374] RSP: 002b:00007fff6b6fe1f8 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4 [ 28.113811][ T374] RAX: 0000000000000000 RBX: 00007fff6b6fe2e0 RCX: 00007f3c5fd52e59 [ 28.121788][ T374] RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003 [ 28.129757][ T374] RBP: 0000000000006ce3 R08: 0000000000000001 R09: 0000000000000000 [ 28.137729][ T374] R10: 0000001b33020000 R11: 0000000000000246 R12: 0000000000000000 [ 28.145705][ T374] R13: 00007f3c5ffdafac R14: 00007f3c5ffdafa8 R15: 00007f3c5ffdafa0 [ 28.153675][ T374] [ 28.156703][ T374] [ 28.159043][ T374] Allocated by task 374: [ 28.163278][ T374] __kasan_kmalloc+0xd4/0x100 [ 28.167954][ T374] __kmalloc+0x13d/0x2c0 [ 28.172192][ T374] l2tp_session_create+0x39/0xb60 [ 28.177214][ T374] pppol2tp_connect+0xbf5/0x1640 [ 28.182151][ T374] __sys_connect+0x3cb/0x450 [ 28.186755][ T374] __x64_sys_connect+0x7a/0x90 [ 28.191517][ T374] x64_sys_call+0x7c/0x9a0 [ 28.195937][ T374] do_syscall_64+0x4c/0xa0 [ 28.200442][ T374] entry_SYSCALL_64_after_hwframe+0x66/0xd0 [ 28.206352][ T374] [ 28.208672][ T374] Freed by task 374: [ 28.212600][ T374] kasan_set_track+0x4a/0x70 [ 28.217191][ T374] kasan_set_free_info+0x23/0x40 [ 28.222123][ T374] ____kasan_slab_free+0x125/0x160 [ 28.227232][ T374] __kasan_slab_free+0x11/0x20 [ 28.231991][ T374] slab_free_freelist_hook+0xc2/0x190 [ 28.237358][ T374] kfree+0xc4/0x270 [ 28.241248][ T374] l2tp_session_put+0xaf/0x1a0 [ 28.246012][ T374] l2tp_session_delete+0x3a9/0x4a0 [ 28.251116][ T374] pppol2tp_release+0x169/0x2b0 [ 28.255965][ T374] sock_close+0xb8/0x200 [ 28.260220][ T374] __fput+0x22b/0x900 [ 28.264210][ T374] ____fput+0x15/0x20 [ 28.268203][ T374] task_work_run+0x127/0x190 [ 28.272790][ T374] exit_to_user_mode_loop+0xd0/0xe0 [ 28.277984][ T374] exit_to_user_mode_prepare+0x87/0xd0 [ 28.283434][ T374] syscall_exit_to_user_mode+0x1a/0x30 [ 28.288885][ T374] do_syscall_64+0x58/0xa0 [ 28.293297][ T374] entry_SYSCALL_64_after_hwframe+0x66/0xd0 [ 28.299202][ T374] [ 28.301518][ T374] The buggy address belongs to the object at ffff88812b448c00 [ 28.301518][ T374] which belongs to the cache kmalloc-512 of size 512 [ 28.315671][ T374] The buggy address is located 336 bytes inside of [ 28.315671][ T374] 512-byte region [ffff88812b448c00, ffff88812b448e00) [ 28.328942][ T374] The buggy address belongs to the page: [ 28.334565][ T374] page:ffffea0004ad1200 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x12b448 [ 28.344795][ T374] head:ffffea0004ad1200 order:2 compound_mapcount:0 compound_pincount:0 [ 28.353113][ T374] flags: 0x4000000000010200(slab|head|zone=1) [ 28.359182][ T374] raw: 4000000000010200 0000000000000000 dead000000000122 ffff888100042f00 [ 28.367763][ T374] raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000 [ 28.376340][ T374] page dumped because: kasan: bad access detected [ 28.382748][ T374] page_owner tracks the page as allocated [ 28.388475][ T374] page last allocated via order 2, migratetype Unmovable, gfp_mask 0x152a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_HARDWALL), pid 20, ts 27896104930, free_ts 26649402063 [ 28.406876][ T374] post_alloc_hook+0x192/0x1b0 [ 28.411642][ T374] prep_new_page+0x1c/0x110 [ 28.416147][ T374] get_page_from_freelist+0x2c3a/0x2cd0 [ 28.421691][ T374] __alloc_pages+0x1a2/0x460 [ 28.426283][ T374] new_slab+0xa0/0x4d0 [ 28.430365][ T374] ___slab_alloc+0x3ac/0x840 [ 28.434971][ T374] __slab_alloc+0x49/0x90 [ 28.439307][ T374] __kmalloc+0x16a/0x2c0 [ 28.443550][ T374] ___neigh_create+0x6fb/0x1c50 [ 28.448419][ T374] __neigh_create+0x31/0x40 [ 28.452916][ T374] ip6_finish_output2+0xae3/0x1790 [ 28.458031][ T374] __ip6_finish_output+0x621/0x7e0 [ 28.463141][ T374] ip6_finish_output+0x31/0x220 [ 28.467987][ T374] ip6_output+0x1fa/0x410 [ 28.472314][ T374] mld_sendpack+0x68d/0xba0 [ 28.476810][ T374] mld_ifc_work+0x83b/0xc20 [ 28.481308][ T374] page last free stack trace: [ 28.485977][ T374] free_unref_page_prepare+0x5fa/0x600 [ 28.491451][ T374] free_unref_page+0xae/0x540 [ 28.496166][ T374] __free_pages+0x6c/0x100 [ 28.500590][ T374] free_pages+0x82/0x90 [ 28.504743][ T374] kasan_depopulate_vmalloc_pte+0x6b/0x90 [ 28.510551][ T374] __apply_to_page_range+0x8ca/0xc70 [ 28.515846][ T374] apply_to_existing_page_range+0x38/0x50 [ 28.521560][ T374] kasan_release_vmalloc+0x97/0xb0 [ 28.526675][ T374] __purge_vmap_area_lazy+0xa8d/0x1890 [ 28.532126][ T374] try_purge_vmap_area_lazy+0x38/0x50 [ 28.537494][ T374] free_vmap_area_noflush+0xa59/0xaa0 [ 28.542862][ T374] remove_vm_area+0x1c1/0x1e0 [ 28.547535][ T374] __vunmap+0x259/0x980 [ 28.551699][ T374] vfree+0x8b/0xc0 [ 28.555436][ T374] kcov_close+0x2b/0x50 [ 28.559590][ T374] __fput+0x22b/0x900 [ 28.563575][ T374] [ 28.565893][ T374] Memory state around the buggy address: [ 28.571515][ T374] ffff88812b448c00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 28.579574][ T374] ffff88812b448c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 28.587654][ T374] >ffff88812b448d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 28.595706][ T374] ^ [ 28.602382][ T374] ffff88812b448d80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 28.610441][ T374] ffff88812b448e00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 28.618498][ T374] ================================================================== [ 28.626573][ T374] Disabling lock debugging due to kernel taint [ 29.298352][ T338] device bridge_slave_1 left promiscuous mode [ 29.304653][ T338] bridge0: port 2(bridge_slave_1) entered disabled state [ 29.315693][ T338] device bridge_slave_0 left promiscuous mode [ 29.321990][ T338] bridge0: port 1(bridge_slave_0) entered disabled state [ 29.330309][ T338] device veth1_macvtap left promiscuous mode [ 29.336352][ T338] device veth0_vlan left promiscuous mode 2026/07/09 06:52:18 executed programs: 234 [ 32.547985][ T30] kauditd_printk_skb: 40 callbacks suppressed [ 32.548000][ T30] audit: type=1400 audit(1783579938.940:114): avc: denied { write } for pid=293 comm="syz-execprog" path="pipe:[13987]" dev="pipefs" ino=13987 scontext=root:sysadm_r:sysadm_t tcontext=system_u:system_r:sshd_t tclass=fifo_file permissive=1 2026/07/09 06:52:23 executed programs: 537