================================================================== BUG: KASAN: slab-use-after-free in __lock_acquire+0x2de0/0x3cb0 kernel/locking/lockdep.c:5007 Read of size 8 at addr ffff88801f745818 by task kswapd0/111 CPU: 0 UID: 0 PID: 111 Comm: kswapd0 Not tainted 6.11.0-rc6-syzkaller-00026-g88fac17500f4 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:93 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:119 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+0x2de0/0x3cb0 kernel/locking/lockdep.c:5007 lock_acquire kernel/locking/lockdep.c:5759 [inline] lock_acquire+0x1b1/0x560 kernel/locking/lockdep.c:5724 __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:397 [inline] p9_req_put net/9p/client.c:405 [inline] p9_req_put+0xaf/0x250 net/9p/client.c:402 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:173 [inline] handle_irq arch/x86/kernel/irq.c:247 [inline] call_irq_handler arch/x86/kernel/irq.c:259 [inline] __common_interrupt+0xdf/0x250 arch/x86/kernel/irq.c:285 common_interrupt+0xab/0xd0 arch/x86/kernel/irq.c:278 asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:693 RIP: 0010:list_lru_count_one+0x155/0x320 mm/list_lru.c:196 Code: e8 d0 04 bc ff 85 db 0f 85 29 01 00 00 e8 83 02 bc ff 48 c7 c7 a0 94 db 8d 48 8d 35 00 00 00 00 e8 30 2b 9a ff e8 0b 23 a3 ff <48> 89 e8 5b 5d 41 5c 41 5d c3 cc cc cc cc e8 58 02 bc ff 49 8d bd RSP: 0018:ffffc90000e1f6b8 EFLAGS: 00000293 RAX: 0000000000000000 RBX: 0000000000000001 RCX: ffffc90000e1f640 RDX: 0000000000000000 RSI: ffffffff8b4cd360 RDI: ffff88801f894cc4 RBP: 0000000000000000 R08: 0000000000000000 R09: fffffbfff2023bc3 R10: ffffffff9011de1f R11: 0000000000000000 R12: 00000000ffffffff R13: ffff88801cece000 R14: 0000000000000000 R15: ffffc90000e1f888 list_lru_shrink_count include/linux/list_lru.h:156 [inline] super_cache_count+0x175/0x300 fs/super.c:263 do_shrink_slab+0x82/0x11c0 mm/shrinker.c:382 shrink_slab+0x330/0x12c0 mm/shrinker.c:662 shrink_one+0x47e/0x7b0 mm/vmscan.c:4815 shrink_many mm/vmscan.c:4876 [inline] lru_gen_shrink_node mm/vmscan.c:4954 [inline] shrink_node+0x2452/0x39d0 mm/vmscan.c:5934 kswapd_shrink_node mm/vmscan.c:6762 [inline] balance_pgdat+0xc19/0x18f0 mm/vmscan.c:6954 kswapd+0x5ea/0xbf0 mm/vmscan.c:7223 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Allocated by task 6118: 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_noprof include/linux/slab.h:681 [inline] p9_client_create+0xcf/0x11b0 net/9p/client.c:983 v9fs_session_init+0x1f8/0x1a80 fs/9p/v9fs.c:410 v9fs_mount+0xc6/0xa50 fs/9p/vfs_super.c:122 legacy_get_tree+0x109/0x220 fs/fs_context.c:662 vfs_get_tree+0x8f/0x380 fs/super.c:1800 do_new_mount fs/namespace.c:3472 [inline] path_mount+0x6e1/0x1f10 fs/namespace.c:3799 do_mount fs/namespace.c:3812 [inline] __do_sys_mount fs/namespace.c:4020 [inline] __se_sys_mount fs/namespace.c:3997 [inline] __ia32_sys_mount+0x292/0x310 fs/namespace.c:3997 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline] __do_fast_syscall_32+0x73/0x120 arch/x86/entry/common.c:386 do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411 entry_SYSENTER_compat_after_hwframe+0x84/0x8e Freed by task 6118: 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+0xf7/0x160 mm/kasan/common.c:240 __kasan_slab_free+0x32/0x50 mm/kasan/common.c:256 kasan_slab_free include/linux/kasan.h:184 [inline] slab_free_hook mm/slub.c:2252 [inline] slab_free mm/slub.c:4473 [inline] kfree+0x12a/0x3b0 mm/slub.c:4594 p9_client_create+0x9ca/0x11b0 net/9p/client.c:1054 v9fs_session_init+0x1f8/0x1a80 fs/9p/v9fs.c:410 v9fs_mount+0xc6/0xa50 fs/9p/vfs_super.c:122 legacy_get_tree+0x109/0x220 fs/fs_context.c:662 vfs_get_tree+0x8f/0x380 fs/super.c:1800 do_new_mount fs/namespace.c:3472 [inline] path_mount+0x6e1/0x1f10 fs/namespace.c:3799 do_mount fs/namespace.c:3812 [inline] __do_sys_mount fs/namespace.c:4020 [inline] __se_sys_mount fs/namespace.c:3997 [inline] __ia32_sys_mount+0x292/0x310 fs/namespace.c:3997 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline] __do_fast_syscall_32+0x73/0x120 arch/x86/entry/common.c:386 do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411 entry_SYSENTER_compat_after_hwframe+0x84/0x8e The buggy address belongs to the object at ffff88801f745800 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 24 bytes inside of freed 512-byte region [ffff88801f745800, ffff88801f745a00) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1f744 head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xfdffffff(slab) raw: 00fff00000000040 ffff88801ac42c80 ffffea0000ac4e00 dead000000000002 raw: 0000000000000000 0000000080100010 00000001fdffffff 0000000000000000 head: 00fff00000000040 ffff88801ac42c80 ffffea0000ac4e00 dead000000000002 head: 0000000000000000 0000000080100010 00000001fdffffff 0000000000000000 head: 00fff00000000002 ffffea00007dd101 ffffffffffffffff 0000000000000000 head: 0000000000000004 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 5531, tgid 5531 (syz-executor), ts 63883553663, free_ts 63575069796 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x2d1/0x350 mm/page_alloc.c:1493 prep_new_page mm/page_alloc.c:1501 [inline] get_page_from_freelist+0x1351/0x2e50 mm/page_alloc.c:3439 __alloc_pages_noprof+0x22b/0x2460 mm/page_alloc.c:4695 __alloc_pages_node_noprof include/linux/gfp.h:269 [inline] alloc_pages_node_noprof include/linux/gfp.h:296 [inline] alloc_slab_page+0x4e/0xf0 mm/slub.c:2321 allocate_slab mm/slub.c:2484 [inline] new_slab+0x84/0x260 mm/slub.c:2537 ___slab_alloc+0xdac/0x1870 mm/slub.c:3723 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3813 __slab_alloc_node mm/slub.c:3866 [inline] slab_alloc_node mm/slub.c:4025 [inline] __do_kmalloc_node mm/slub.c:4157 [inline] __kmalloc_noprof+0x379/0x410 mm/slub.c:4170 kmalloc_noprof include/linux/slab.h:685 [inline] kzalloc_noprof include/linux/slab.h:807 [inline] fib6_info_alloc+0x40/0x160 net/ipv6/ip6_fib.c:155 ip6_route_info_create+0x337/0x1aa0 net/ipv6/route.c:3761 ip6_route_add+0x26/0x1c0 net/ipv6/route.c:3853 addrconf_prefix_route+0x2fe/0x510 net/ipv6/addrconf.c:2486 add_v4_addrs+0x74b/0xa00 net/ipv6/addrconf.c:3269 addrconf_gre_config net/ipv6/addrconf.c:3544 [inline] addrconf_init_auto_addrs+0x18a/0x820 net/ipv6/addrconf.c:3562 addrconf_notify+0xe9e/0x19d0 net/ipv6/addrconf.c:3743 notifier_call_chain+0xb9/0x410 kernel/notifier.c:93 page last free pid 5532 tgid 5532 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1094 [inline] free_unref_page+0x64a/0xe40 mm/page_alloc.c:2612 __put_partials+0x14c/0x170 mm/slub.c:3051 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:3988 [inline] slab_alloc_node mm/slub.c:4037 [inline] __do_kmalloc_node mm/slub.c:4157 [inline] __kmalloc_node_track_caller_noprof+0x1c1/0x440 mm/slub.c:4177 kstrdup+0x3c/0x80 mm/util.c:64 kstrdup_const+0x63/0x80 mm/util.c:87 kvasprintf_const+0x10f/0x1a0 lib/kasprintf.c:48 kobject_set_name_vargs+0x5a/0x140 lib/kobject.c:274 dev_set_name+0xc8/0x100 drivers/base/core.c:3485 netdev_register_kobject+0xc5/0x3f0 net/core/net-sysfs.c:2123 register_netdevice+0x1473/0x1e20 net/core/dev.c:10444 macvlan_common_newlink+0x10d5/0x1a10 drivers/net/macvlan.c:1534 rtnl_newlink_create net/core/rtnetlink.c:3510 [inline] __rtnl_newlink+0x119c/0x1920 net/core/rtnetlink.c:3730 rtnl_newlink+0x67/0xa0 net/core/rtnetlink.c:3743 Memory state around the buggy address: ffff88801f745700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88801f745780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88801f745800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88801f745880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88801f745900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== ---------------- Code disassembly (best guess): 0: e8 d0 04 bc ff call 0xffbc04d5 5: 85 db test %ebx,%ebx 7: 0f 85 29 01 00 00 jne 0x136 d: e8 83 02 bc ff call 0xffbc0295 12: 48 c7 c7 a0 94 db 8d mov $0xffffffff8ddb94a0,%rdi 19: 48 8d 35 00 00 00 00 lea 0x0(%rip),%rsi # 0x20 20: e8 30 2b 9a ff call 0xff9a2b55 25: e8 0b 23 a3 ff call 0xffa32335 * 2a: 48 89 e8 mov %rbp,%rax <-- trapping instruction 2d: 5b pop %rbx 2e: 5d pop %rbp 2f: 41 5c pop %r12 31: 41 5d pop %r13 33: c3 ret 34: cc int3 35: cc int3 36: cc int3 37: cc int3 38: e8 58 02 bc ff call 0xffbc0295 3d: 49 rex.WB 3e: 8d .byte 0x8d 3f: bd .byte 0xbd