================================================================== BUG: KASAN: use-after-free in __lock_acquire+0x3ee7/0x56d0 kernel/locking/lockdep.c:4925 Read of size 8 at addr ffff88802ae47418 by task syz-executor.0/6347 CPU: 1 PID: 6347 Comm: syz-executor.0 Not tainted 6.1.0-syzkaller-09689-g54c3f1a81421 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd1/0x138 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:284 [inline] print_report+0x15e/0x45d mm/kasan/report.c:395 kasan_report+0xbf/0x1f0 mm/kasan/report.c:495 __lock_acquire+0x3ee7/0x56d0 kernel/locking/lockdep.c:4925 lock_acquire kernel/locking/lockdep.c:5668 [inline] lock_acquire+0x1e3/0x630 kernel/locking/lockdep.c:5633 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x3d/0x60 kernel/locking/spinlock.c:162 put_pmu_ctx kernel/events/core.c:4913 [inline] put_pmu_ctx+0xad/0x390 kernel/events/core.c:4893 _free_event+0x3c5/0x13d0 kernel/events/core.c:5196 free_event+0x58/0xc0 kernel/events/core.c:5224 __do_sys_perf_event_open+0x66d/0x2980 kernel/events/core.c:12701 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7fa61268c0d9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fa61341c168 EFLAGS: 00000246 ORIG_RAX: 000000000000012a RAX: ffffffffffffffda RBX: 00007fa6127abf80 RCX: 00007fa61268c0d9 RDX: 0000000000000000 RSI: 00000000000000a2 RDI: 0000000020000040 RBP: 00007fa6126e7ae9 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffcdb4a98ef R14: 00007fa61341c300 R15: 0000000000022000 Allocated by task 6347: kasan_save_stack+0x22/0x40 mm/kasan/common.c:45 kasan_set_track+0x25/0x30 mm/kasan/common.c:52 ____kasan_kmalloc mm/kasan/common.c:371 [inline] ____kasan_kmalloc mm/kasan/common.c:330 [inline] __kasan_kmalloc+0xa5/0xb0 mm/kasan/common.c:380 kmalloc include/linux/slab.h:580 [inline] kzalloc include/linux/slab.h:720 [inline] alloc_perf_context kernel/events/core.c:4693 [inline] find_get_context+0xcc/0x810 kernel/events/core.c:4763 __do_sys_perf_event_open+0x963/0x2980 kernel/events/core.c:12476 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Freed by task 21: kasan_save_stack+0x22/0x40 mm/kasan/common.c:45 kasan_set_track+0x25/0x30 mm/kasan/common.c:52 kasan_save_free_info+0x2e/0x40 mm/kasan/generic.c:518 ____kasan_slab_free mm/kasan/common.c:236 [inline] ____kasan_slab_free+0x160/0x1c0 mm/kasan/common.c:200 kasan_slab_free include/linux/kasan.h:177 [inline] slab_free_hook mm/slub.c:1781 [inline] slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1807 slab_free mm/slub.c:3787 [inline] __kmem_cache_free+0xaf/0x3b0 mm/slub.c:3800 rcu_do_batch kernel/rcu/tree.c:2244 [inline] rcu_core+0x81f/0x1980 kernel/rcu/tree.c:2504 __do_softirq+0x1fb/0xadc kernel/softirq.c:571 Last potentially related work creation: kasan_save_stack+0x22/0x40 mm/kasan/common.c:45 __kasan_record_aux_stack+0xbc/0xd0 mm/kasan/generic.c:488 __call_rcu_common.constprop.0+0x99/0x820 kernel/rcu/tree.c:2753 put_ctx kernel/events/core.c:1180 [inline] put_ctx+0x116/0x1e0 kernel/events/core.c:1173 __do_sys_perf_event_open+0xa87/0x2980 kernel/events/core.c:12696 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Second to last potentially related work creation: kasan_save_stack+0x22/0x40 mm/kasan/common.c:45 __kasan_record_aux_stack+0xbc/0xd0 mm/kasan/generic.c:488 __call_rcu_common.constprop.0+0x99/0x820 kernel/rcu/tree.c:2753 fib6_info_release include/net/ip6_fib.h:340 [inline] fib6_info_release include/net/ip6_fib.h:337 [inline] ip6_route_add+0x131/0x150 net/ipv6/route.c:3848 addrconf_prefix_route+0x30a/0x4e0 net/ipv6/addrconf.c:2425 add_v4_addrs+0x64a/0x880 net/ipv6/addrconf.c:3169 addrconf_gre_config net/ipv6/addrconf.c:3443 [inline] addrconf_notify+0xaca/0x1c80 net/ipv6/addrconf.c:3627 notifier_call_chain+0xb5/0x200 kernel/notifier.c:87 call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:1944 call_netdevice_notifiers_extack net/core/dev.c:1982 [inline] call_netdevice_notifiers net/core/dev.c:1996 [inline] __dev_notify_flags+0x120/0x2d0 net/core/dev.c:8569 dev_change_flags+0x11b/0x170 net/core/dev.c:8607 do_setlink+0x9f1/0x3bb0 net/core/rtnetlink.c:2827 __rtnl_newlink+0xd69/0x1840 net/core/rtnetlink.c:3590 rtnl_newlink+0x68/0xa0 net/core/rtnetlink.c:3637 rtnetlink_rcv_msg+0x43e/0xca0 net/core/rtnetlink.c:6141 netlink_rcv_skb+0x165/0x440 net/netlink/af_netlink.c:2564 netlink_unicast_kernel net/netlink/af_netlink.c:1330 [inline] netlink_unicast+0x547/0x7f0 net/netlink/af_netlink.c:1356 netlink_sendmsg+0x91b/0xe10 net/netlink/af_netlink.c:1932 sock_sendmsg_nosec net/socket.c:714 [inline] sock_sendmsg+0xd3/0x120 net/socket.c:734 __sys_sendto+0x23a/0x340 net/socket.c:2117 __do_sys_sendto net/socket.c:2129 [inline] __se_sys_sendto net/socket.c:2125 [inline] __x64_sys_sendto+0xe1/0x1b0 net/socket.c:2125 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd The buggy address belongs to the object at ffff88802ae47400 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 24 bytes inside of 512-byte region [ffff88802ae47400, ffff88802ae47600) The buggy address belongs to the physical page: page:ffffea0000ab9100 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2ae44 head:ffffea0000ab9100 order:2 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffff888012441c80 ffffea0000a33300 dead000000000002 raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd2a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5330, tgid 5330 (syz-executor.3), ts 90319919204, free_ts 90291049108 prep_new_page mm/page_alloc.c:2539 [inline] get_page_from_freelist+0x10b5/0x2d50 mm/page_alloc.c:4291 __alloc_pages+0x1cb/0x5b0 mm/page_alloc.c:5558 alloc_pages+0x1aa/0x270 mm/mempolicy.c:2285 alloc_slab_page mm/slub.c:1851 [inline] allocate_slab+0x25f/0x350 mm/slub.c:1998 new_slab mm/slub.c:2051 [inline] ___slab_alloc+0xa91/0x1400 mm/slub.c:3193 __slab_alloc.constprop.0+0x56/0xa0 mm/slub.c:3292 __slab_alloc_node mm/slub.c:3345 [inline] slab_alloc_node mm/slub.c:3442 [inline] __kmem_cache_alloc_node+0x1a4/0x430 mm/slub.c:3491 __do_kmalloc_node mm/slab_common.c:967 [inline] __kmalloc_node_track_caller+0x4b/0xc0 mm/slab_common.c:988 kmalloc_reserve net/core/skbuff.c:492 [inline] __alloc_skb+0xe9/0x310 net/core/skbuff.c:565 alloc_skb include/linux/skbuff.h:1270 [inline] nlmsg_new include/net/netlink.h:1002 [inline] inet6_ifa_notify+0x118/0x230 net/ipv6/addrconf.c:5496 __ipv6_ifa_notify+0x177/0xb60 net/ipv6/addrconf.c:6144 ipv6_ifa_notify net/ipv6/addrconf.c:6196 [inline] add_addr+0x237/0x350 net/ipv6/addrconf.c:3108 add_v4_addrs+0x61e/0x880 net/ipv6/addrconf.c:3167 addrconf_gre_config net/ipv6/addrconf.c:3443 [inline] addrconf_notify+0xaca/0x1c80 net/ipv6/addrconf.c:3627 notifier_call_chain+0xb5/0x200 kernel/notifier.c:87 call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:1944 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1459 [inline] free_pcp_prepare+0x65c/0xd90 mm/page_alloc.c:1509 free_unref_page_prepare mm/page_alloc.c:3387 [inline] free_unref_page+0x1d/0x4d0 mm/page_alloc.c:3483 __unfreeze_partials+0x17c/0x1a0 mm/slub.c:2637 qlink_free mm/kasan/quarantine.c:168 [inline] qlist_free_all+0x6a/0x170 mm/kasan/quarantine.c:187 kasan_quarantine_reduce+0x192/0x220 mm/kasan/quarantine.c:294 __kasan_slab_alloc+0x66/0x90 mm/kasan/common.c:302 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook mm/slab.h:761 [inline] slab_alloc_node mm/slub.c:3452 [inline] __kmem_cache_alloc_node+0x1ea/0x430 mm/slub.c:3491 kmalloc_trace+0x26/0x60 mm/slab_common.c:1062 kmalloc include/linux/slab.h:580 [inline] kzalloc include/linux/slab.h:720 [inline] fib6_info_alloc+0xc9/0x220 net/ipv6/ip6_fib.c:155 ip6_route_info_create+0x341/0x18f0 net/ipv6/route.c:3749 ip6_route_add+0x28/0x150 net/ipv6/route.c:3843 addrconf_add_mroute+0x1e1/0x310 net/ipv6/addrconf.c:2489 addrconf_add_dev+0x156/0x1c0 net/ipv6/addrconf.c:2507 addrconf_dev_config+0x1ec/0x410 net/ipv6/addrconf.c:3382 addrconf_notify+0xfb6/0x1c80 net/ipv6/addrconf.c:3635 notifier_call_chain+0xb5/0x200 kernel/notifier.c:87 Memory state around the buggy address: ffff88802ae47300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88802ae47380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88802ae47400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88802ae47480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88802ae47500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================