BUG: KASAN: slab-use-after-free in __lock_acquire+0x2dd6/0x3b30 kernel/locking/lockdep.c:5005 Read of size 8 at addr ffff88801c6f7018 by task kworker/0:0/7 CPU: 0 PID: 7 Comm: kworker/0:0 Not tainted 6.9.0-rc1-syzkaller-00178-g317c7bc0ef03 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 Workqueue: events_power_efficient wg_ratelimiter_gc_entries Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:114 print_address_description mm/kasan/report.c:377 [inline] print_report+0xc3/0x620 mm/kasan/report.c:488 kasan_report+0xd9/0x110 mm/kasan/report.c:601 __lock_acquire+0x2dd6/0x3b30 kernel/locking/lockdep.c:5005 lock_acquire kernel/locking/lockdep.c:5754 [inline] lock_acquire+0x1b1/0x560 kernel/locking/lockdep.c:5719 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:162 p9_tag_remove net/9p/client.c:394 [inline] p9_req_put net/9p/client.c:402 [inline] p9_req_put+0xca/0x250 net/9p/client.c:399 req_done+0x1e7/0x2f0 net/9p/trans_virtio.c:147 vring_interrupt drivers/virtio/virtio_ring.c:2595 [inline] vring_interrupt+0x31b/0x400 drivers/virtio/virtio_ring.c:2570 __handle_irq_event_percpu+0x229/0x7c0 kernel/irq/handle.c:158 handle_irq_event_percpu kernel/irq/handle.c:193 [inline] handle_irq_event+0xab/0x1e0 kernel/irq/handle.c:210 handle_edge_irq+0x263/0xd10 kernel/irq/chip.c:831 generic_handle_irq_desc include/linux/irqdesc.h:161 [inline] handle_irq arch/x86/kernel/irq.c:238 [inline] __common_interrupt+0xde/0x250 arch/x86/kernel/irq.c:257 common_interrupt+0xab/0xd0 arch/x86/kernel/irq.c:247 asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:693 RIP: 0010:lock_acquire+0x1f2/0x560 kernel/locking/lockdep.c:5722 Code: c1 05 4a 11 96 7e 83 f8 01 0f 85 ea 02 00 00 9c 58 f6 c4 02 0f 85 d5 02 00 00 48 85 ed 74 01 fb 48 b8 00 00 00 00 00 fc ff df <48> 01 c3 48 c7 03 00 00 00 00 48 c7 43 08 00 00 00 00 48 8b 84 24 RSP: 0018:ffffc90000397b80 EFLAGS: 00000206 RAX: dffffc0000000000 RBX: 1ffff92000072f72 RCX: ffffffff816b852e RDX: 0000000000000001 RSI: ffffffff8b0cd520 RDI: ffffffff8b6f0520 RBP: 0000000000000200 R08: 0000000000000000 R09: fffffbfff27b1c4d R10: ffffffff93d8e26f R11: 0000000000000002 R12: 0000000000000001 R13: 0000000000000000 R14: ffffffff8e781498 R15: 0000000000000000 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154 spin_lock include/linux/spinlock.h:351 [inline] wg_ratelimiter_gc_entries+0xc6/0x520 drivers/net/wireguard/ratelimiter.c:63 process_one_work+0x902/0x1a30 kernel/workqueue.c:3254 process_scheduled_works kernel/workqueue.c:3335 [inline] worker_thread+0x6c8/0xf70 kernel/workqueue.c:3416 kthread+0x2c1/0x3a0 kernel/kthread.c:388 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:243 Allocated by task 6178: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:370 [inline] __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:387 kmalloc include/linux/slab.h:628 [inline] p9_client_create+0xcf/0x11b0 net/9p/client.c:980 v9fs_session_init+0x1f8/0x1a80 fs/9p/v9fs.c:410 v9fs_mount+0xc6/0xa90 fs/9p/vfs_super.c:122 legacy_get_tree+0x109/0x220 fs/fs_context.c:662 vfs_get_tree+0x8f/0x380 fs/super.c:1797 do_new_mount fs/namespace.c:3352 [inline] path_mount+0x6e1/0x1f10 fs/namespace.c:3679 do_mount fs/namespace.c:3692 [inline] __do_sys_mount fs/namespace.c:3898 [inline] __se_sys_mount fs/namespace.c:3875 [inline] __ia32_sys_mount+0x295/0x320 fs/namespace.c:3875 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline] __do_fast_syscall_32+0x7a/0x120 arch/x86/entry/common.c:321 do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:346 entry_SYSENTER_compat_after_hwframe+0x7a/0x84 Freed by task 6178: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:579 poison_slab_object mm/kasan/common.c:240 [inline] __kasan_slab_free+0x11d/0x1a0 mm/kasan/common.c:256 kasan_slab_free include/linux/kasan.h:184 [inline] slab_free_hook mm/slub.c:2106 [inline] slab_free mm/slub.c:4280 [inline] kfree+0x129/0x390 mm/slub.c:4390 p9_client_create+0x9ca/0x11b0 net/9p/client.c:1051 v9fs_session_init+0x1f8/0x1a80 fs/9p/v9fs.c:410 v9fs_mount+0xc6/0xa90 fs/9p/vfs_super.c:122 legacy_get_tree+0x109/0x220 fs/fs_context.c:662 vfs_get_tree+0x8f/0x380 fs/super.c:1797 do_new_mount fs/namespace.c:3352 [inline] path_mount+0x6e1/0x1f10 fs/namespace.c:3679 do_mount fs/namespace.c:3692 [inline] __do_sys_mount fs/namespace.c:3898 [inline] __se_sys_mount fs/namespace.c:3875 [inline] __ia32_sys_mount+0x295/0x320 fs/namespace.c:3875 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline] __do_fast_syscall_32+0x7a/0x120 arch/x86/entry/common.c:321 do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:346 entry_SYSENTER_compat_after_hwframe+0x7a/0x84 The buggy address belongs to the object at ffff88801c6f7000 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 24 bytes inside of freed 512-byte region [ffff88801c6f7000, ffff88801c6f7200) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1c6f4 head: order:2 entire_mapcount:0 nr_pages_mapped:0 pincount:0 ksm flags: 0xfff80000000840(slab|head|node=0|zone=1|lastcpupid=0xfff) page_type: 0xffffffff() raw: 00fff80000000840 ffff888014c42c80 ffffea0000703400 dead000000000003 raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000 head: 00fff80000000840 ffff888014c42c80 ffffea0000703400 dead000000000003 head: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000 head: 00fff80000000002 ffffea000071bd01 ffffea000071bd48 00000000ffffffff head: 0000000400000000 0000000000000000 00000000ffffffff 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 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5215, tgid 5215 (syz-executor.3), ts 47210896627, free_ts 46865430111 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x2d4/0x350 mm/page_alloc.c:1534 prep_new_page mm/page_alloc.c:1541 [inline] get_page_from_freelist+0xa28/0x3780 mm/page_alloc.c:3317 __alloc_pages+0x22b/0x2460 mm/page_alloc.c:4575 __alloc_pages_node include/linux/gfp.h:238 [inline] alloc_pages_node include/linux/gfp.h:261 [inline] alloc_slab_page mm/slub.c:2175 [inline] allocate_slab mm/slub.c:2338 [inline] new_slab+0xcc/0x3a0 mm/slub.c:2391 ___slab_alloc+0x670/0x16d0 mm/slub.c:3525 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3610 __slab_alloc_node mm/slub.c:3663 [inline] slab_alloc_node mm/slub.c:3835 [inline] __do_kmalloc_node mm/slub.c:3965 [inline] __kmalloc+0x3b4/0x440 mm/slub.c:3979 kmalloc include/linux/slab.h:632 [inline] kzalloc include/linux/slab.h:749 [inline] fib6_info_alloc+0x40/0x160 net/ipv6/ip6_fib.c:155 ip6_route_info_create+0x337/0x1ae0 net/ipv6/route.c:3759 addrconf_f6i_alloc+0x393/0x670 net/ipv6/route.c:4583 ipv6_add_addr+0x538/0x2090 net/ipv6/addrconf.c:1119 inet6_addr_add+0x3bb/0xbe0 net/ipv6/addrconf.c:3057 inet6_rtm_newaddr+0x11ea/0x1ac0 net/ipv6/addrconf.c:5045 rtnetlink_rcv_msg+0x3c7/0xe60 net/core/rtnetlink.c:6595 netlink_rcv_skb+0x165/0x410 net/netlink/af_netlink.c:2559 netlink_unicast_kernel net/netlink/af_netlink.c:1335 [inline] netlink_unicast+0x542/0x820 net/netlink/af_netlink.c:1361 page last free pid 5219 tgid 5219 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1141 [inline] free_unref_page_prepare+0x527/0xb10 mm/page_alloc.c:2347 free_unref_page+0x33/0x3c0 mm/page_alloc.c:2487 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x4e/0x140 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x192/0x1e0 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x69/0x90 mm/kasan/common.c:322 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook mm/slub.c:3798 [inline] slab_alloc_node mm/slub.c:3845 [inline] kmalloc_trace+0x147/0x330 mm/slub.c:3992 kmalloc include/linux/slab.h:628 [inline] kzalloc include/linux/slab.h:749 [inline] kobject_uevent_env+0x265/0x15f0 lib/kobject_uevent.c:525 __kobject_del+0x168/0x1f0 lib/kobject.c:601 kobject_cleanup lib/kobject.c:680 [inline] kobject_release lib/kobject.c:720 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x31c/0x5b0 lib/kobject.c:737 netdev_queue_update_kobjects+0x4a2/0x640 net/core/net-sysfs.c:1854 netif_set_real_num_tx_queues+0x168/0x880 net/core/dev.c:2893 veth_init_queues+0xe1/0x190 drivers/net/veth.c:1754 veth_newlink+0x627/0xa10 drivers/net/veth.c:1877 rtnl_newlink_create net/core/rtnetlink.c:3494 [inline] __rtnl_newlink+0x119c/0x1960 net/core/rtnetlink.c:3714 rtnl_newlink+0x67/0xa0 net/core/rtnetlink.c:3727 rtnetlink_rcv_msg+0x3c7/0xe60 net/core/rtnetlink.c:6595 Memory state around the buggy address: ffff88801c6f6f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88801c6f6f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88801c6f7000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88801c6f7080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88801c6f7100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== ---------------- Code disassembly (best guess): 0: c1 05 4a 11 96 7e 83 roll $0x83,0x7e96114a(%rip) # 0x7e961151 7: f8 clc 8: 01 0f add %ecx,(%rdi) a: 85 ea test %ebp,%edx c: 02 00 add (%rax),%al e: 00 9c 58 f6 c4 02 0f add %bl,0xf02c4f6(%rax,%rbx,2) 15: 85 d5 test %edx,%ebp 17: 02 00 add (%rax),%al 19: 00 48 85 add %cl,-0x7b(%rax) 1c: ed in (%dx),%eax 1d: 74 01 je 0x20 1f: fb sti 20: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 27: fc ff df * 2a: 48 01 c3 add %rax,%rbx <-- trapping instruction 2d: 48 c7 03 00 00 00 00 movq $0x0,(%rbx) 34: 48 c7 43 08 00 00 00 movq $0x0,0x8(%rbx) 3b: 00 3c: 48 rex.W 3d: 8b .byte 0x8b 3e: 84 .byte 0x84 3f: 24 .byte 0x24