BTRFS: device fsid a6a605fc-d5f1-4e66-8595-3726e2b761d6 devid 1 transid 8 /dev/loop0 scanned by syz-executor.0 (12471) BTRFS info (device loop0): using blake2b (blake2b-256-generic) checksum algorithm BTRFS info (device loop0): turning on sync discard BTRFS info (device loop0): using free space tree ================================================================== BUG: KASAN: slab-use-after-free in lockdep_register_key+0x396/0x410 kernel/locking/lockdep.c:1231 Read of size 8 at addr ffff88804f348360 by task syz-executor.0/12471 CPU: 1 PID: 12471 Comm: syz-executor.0 Not tainted 6.3.0-rc4-next-20230329-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/17/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd9/0x150 lib/dump_stack.c:106 print_address_description.constprop.0+0x2c/0x3c0 mm/kasan/report.c:351 print_report mm/kasan/report.c:462 [inline] kasan_report+0x11c/0x130 mm/kasan/report.c:572 lockdep_register_key+0x396/0x410 kernel/locking/lockdep.c:1231 wq_init_lockdep kernel/workqueue.c:3604 [inline] alloc_workqueue+0x3f8/0x1110 kernel/workqueue.c:4476 btrfs_alloc_workqueue+0x19d/0x540 fs/btrfs/async-thread.c:102 btrfs_init_workqueues fs/btrfs/disk-io.c:2183 [inline] open_ctree+0x1493/0x5320 fs/btrfs/disk-io.c:3498 btrfs_fill_super fs/btrfs/super.c:1152 [inline] btrfs_mount_root+0xa49/0xdb0 fs/btrfs/super.c:1521 legacy_get_tree+0x109/0x220 fs/fs_context.c:610 vfs_get_tree+0x8d/0x350 fs/super.c:1510 fc_mount fs/namespace.c:1035 [inline] vfs_kern_mount.part.0+0xd3/0x170 fs/namespace.c:1065 vfs_kern_mount+0x40/0x60 fs/namespace.c:1052 btrfs_mount+0x23f/0xb20 fs/btrfs/super.c:1581 legacy_get_tree+0x109/0x220 fs/fs_context.c:610 vfs_get_tree+0x8d/0x350 fs/super.c:1510 do_new_mount fs/namespace.c:3039 [inline] path_mount+0x134b/0x1e40 fs/namespace.c:3369 do_mount fs/namespace.c:3382 [inline] __do_sys_mount fs/namespace.c:3591 [inline] __se_sys_mount fs/namespace.c:3568 [inline] __x64_sys_mount+0x283/0x300 fs/namespace.c:3568 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: 0033:0x7fc56928d62a Code: 48 c7 c2 b8 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff eb d2 e8 b8 04 00 00 0f 1f 84 00 00 00 00 00 49 89 ca b8 a5 00 00 00 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:00007fc569f4cf88 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 000000000000559d RCX: 00007fc56928d62a RDX: 00000000200055c0 RSI: 0000000020005600 RDI: 00007fc569f4cfe0 RBP: 00007fc569f4d020 R08: 00007fc569f4d020 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000202 R12: 00000000200055c0 R13: 0000000020005600 R14: 00007fc569f4cfe0 R15: 0000000020000440 Allocated by task 9412: 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:374 [inline] ____kasan_kmalloc mm/kasan/common.c:333 [inline] __kasan_kmalloc+0xa2/0xb0 mm/kasan/common.c:383 kasan_kmalloc include/linux/kasan.h:196 [inline] __do_kmalloc_node mm/slab_common.c:966 [inline] __kmalloc_node_track_caller+0x5f/0x1a0 mm/slab_common.c:986 kmalloc_reserve+0xf0/0x270 net/core/skbuff.c:535 pskb_expand_head+0x237/0x1160 net/core/skbuff.c:1991 __skb_cow include/linux/skbuff.h:3554 [inline] skb_cow_head include/linux/skbuff.h:3588 [inline] batadv_skb_head_push+0xeb/0x280 net/batman-adv/soft-interface.c:72 batadv_send_skb_packet+0x114/0x6a0 net/batman-adv/send.c:86 batadv_iv_ogm_send_to_if net/batman-adv/bat_iv_ogm.c:392 [inline] batadv_iv_ogm_emit net/batman-adv/bat_iv_ogm.c:420 [inline] batadv_iv_send_outstanding_bat_ogm_packet+0x608/0x960 net/batman-adv/bat_iv_ogm.c:1700 process_one_work+0x99a/0x15e0 kernel/workqueue.c:2405 worker_thread+0x67d/0x10c0 kernel/workqueue.c:2552 kthread+0x33e/0x440 kernel/kthread.c:379 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 Freed by task 9412: 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:521 ____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:162 [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/0x2d0 mm/slub.c:3800 skb_kfree_head net/core/skbuff.c:856 [inline] skb_free_head+0x108/0x1a0 net/core/skbuff.c:868 skb_release_data+0x57a/0x820 net/core/skbuff.c:897 skb_release_all net/core/skbuff.c:962 [inline] __kfree_skb net/core/skbuff.c:976 [inline] consume_skb net/core/skbuff.c:1189 [inline] consume_skb+0xd0/0x170 net/core/skbuff.c:1183 packet_rcv+0xee/0x15c0 net/packet/af_packet.c:2229 __netif_receive_skb_one_core+0x114/0x180 net/core/dev.c:5479 __netif_receive_skb+0x1f/0x1c0 net/core/dev.c:5593 process_backlog+0x13e/0x6d0 net/core/dev.c:5921 __napi_poll+0xb3/0x520 net/core/dev.c:6482 napi_poll net/core/dev.c:6549 [inline] net_rx_action+0x8d7/0xc50 net/core/dev.c:6659 __do_softirq+0x1d4/0x905 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:491 insert_work+0x48/0x360 kernel/workqueue.c:1365 __queue_work+0x5c6/0xfb0 kernel/workqueue.c:1526 queue_work_on+0xf2/0x110 kernel/workqueue.c:1554 ops_exit_list+0xb0/0x170 net/core/net_namespace.c:170 setup_net+0x7fb/0xc50 net/core/net_namespace.c:362 copy_net_ns+0x4ee/0x8e0 net/core/net_namespace.c:491 create_new_namespaces+0x3f6/0xb20 kernel/nsproxy.c:110 copy_namespaces+0x410/0x500 kernel/nsproxy.c:179 copy_process+0x31ae/0x76b0 kernel/fork.c:2415 kernel_clone+0xeb/0x890 kernel/fork.c:2831 __do_sys_clone+0xba/0x100 kernel/fork.c:2974 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:491 kvfree_call_rcu+0x70/0xad0 kernel/rcu/tree.c:3331 neigh_destroy+0x433/0x660 net/core/neighbour.c:910 neigh_release include/net/neighbour.h:447 [inline] neigh_cleanup_and_release net/core/neighbour.c:103 [inline] neigh_periodic_work+0x726/0xb80 net/core/neighbour.c:994 process_one_work+0x99a/0x15e0 kernel/workqueue.c:2405 worker_thread+0x67d/0x10c0 kernel/workqueue.c:2552 kthread+0x33e/0x440 kernel/kthread.c:379 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 The buggy address belongs to the object at ffff88804f348000 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 864 bytes inside of freed 1024-byte region [ffff88804f348000, ffff88804f348400) The buggy address belongs to the physical page: page:ffffea00013cd200 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x4f348 head:ffffea00013cd200 order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000010200 ffff888012441dc0 dead000000000100 dead000000000122 raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd2820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5102, tgid 5102 (syz-executor.1), ts 117072290280, free_ts 25997791764 prep_new_page mm/page_alloc.c:1729 [inline] get_page_from_freelist+0xf75/0x2aa0 mm/page_alloc.c:3493 __alloc_pages+0x1cb/0x4a0 mm/page_alloc.c:4759 alloc_pages+0x1aa/0x270 mm/mempolicy.c:2283 alloc_slab_page mm/slub.c:1851 [inline] allocate_slab+0x28e/0x380 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+0x136/0x320 mm/slub.c:3491 __do_kmalloc_node mm/slab_common.c:965 [inline] __kmalloc_node_track_caller+0x4f/0x1a0 mm/slab_common.c:986 kmalloc_reserve+0xf0/0x270 net/core/skbuff.c:535 __alloc_skb+0x129/0x330 net/core/skbuff.c:604 alloc_skb include/linux/skbuff.h:1269 [inline] nlmsg_new include/net/netlink.h:1003 [inline] inet6_rt_notify+0xf0/0x2b0 net/ipv6/route.c:6166 fib6_add_rt2node net/ipv6/ip6_fib.c:1251 [inline] fib6_add+0x200d/0x4080 net/ipv6/ip6_fib.c:1477 __ip6_ins_rt net/ipv6/route.c:1302 [inline] ip6_route_add+0x8f/0x150 net/ipv6/route.c:3840 addrconf_prefix_route+0x309/0x520 net/ipv6/addrconf.c:2425 fixup_permanent_addr net/ipv6/addrconf.c:3500 [inline] addrconf_permanent_addr net/ipv6/addrconf.c:3524 [inline] addrconf_notify+0x1157/0x19f0 net/ipv6/addrconf.c:3596 notifier_call_chain+0xb6/0x3c0 kernel/notifier.c:93 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1302 [inline] free_unref_page_prepare+0x4d8/0xb80 mm/page_alloc.c:2555 free_unref_page+0x33/0x370 mm/page_alloc.c:2650 free_contig_range+0xb5/0x180 mm/page_alloc.c:6963 destroy_args+0x6c4/0x920 mm/debug_vm_pgtable.c:1023 debug_vm_pgtable+0x257b/0x4650 mm/debug_vm_pgtable.c:1403 do_one_initcall+0x102/0x540 init/main.c:1246 do_initcall_level init/main.c:1319 [inline] do_initcalls init/main.c:1335 [inline] do_basic_setup init/main.c:1354 [inline] kernel_init_freeable+0x5a4/0x890 init/main.c:1571 kernel_init+0x1e/0x2c0 init/main.c:1462 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 Memory state around the buggy address: ffff88804f348200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88804f348280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88804f348300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88804f348380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88804f348400: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================