================================================================== BUG: KASAN: slab-use-after-free in __lock_acquire+0x42e4/0x5e20 kernel/locking/lockdep.c:5012 Read of size 8 at addr ffff8880101df418 by task syz-fuzzer/5384 CPU: 0 PID: 5384 Comm: syz-fuzzer Not tainted 6.4.0-syzkaller-09904-ga507db1d8fdc #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014 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:364 print_report mm/kasan/report.c:475 [inline] kasan_report+0x11d/0x130 mm/kasan/report.c:588 __lock_acquire+0x42e4/0x5e20 kernel/locking/lockdep.c:5012 lock_acquire kernel/locking/lockdep.c:5761 [inline] lock_acquire+0x1b1/0x520 kernel/locking/lockdep.c:5726 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x3d/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+0x1e2/0x2e0 net/9p/trans_virtio.c:147 vring_interrupt drivers/virtio/virtio_ring.c:2501 [inline] vring_interrupt+0x2a1/0x3d0 drivers/virtio/virtio_ring.c:2476 __handle_irq_event_percpu+0x22b/0x730 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+0x263/0xd00 kernel/irq/chip.c:834 generic_handle_irq_desc include/linux/irqdesc.h:161 [inline] handle_irq arch/x86/kernel/irq.c:238 [inline] __common_interrupt+0xa1/0x220 arch/x86/kernel/irq.c:257 common_interrupt+0x51/0xd0 arch/x86/kernel/irq.c:247 asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:636 RIP: 0033:0x414314 Code: 29 48 8b 50 08 48 85 d2 74 20 48 89 d8 48 89 cb 48 89 d1 0f 1f 00 e8 7b 09 00 00 48 8b 44 24 38 48 8b 4c 24 48 48 8b 5c 24 40 <48> 8b 10 48 89 d8 48 89 cb 48 89 d1 e8 fb 61 05 00 80 3d 49 16 af RSP: 002b:000000c0005dcf18 EFLAGS: 00000246 RAX: 0000000000956ce0 RBX: 000000c0048e95b8 RCX: 000000c0046eb538 RDX: 0000000000956ce0 RSI: 000000c0046eb4b0 RDI: 0000000000000000 RBP: 000000c0005dcf40 R08: 0000000000000018 R09: 000000c0046eb538 R10: 0000000000000000 R11: 000000c0046eb4b8 R12: 00000000000000e6 R13: 000000c0046eb4b8 R14: 000000c0000061a0 R15: 000000c0048e9530 Allocated by task 7255: 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 kmalloc include/linux/slab.h:579 [inline] p9_client_create+0xb3/0x1140 net/9p/client.c:979 v9fs_session_init+0x1e4/0x1980 fs/9p/v9fs.c:410 v9fs_mount+0xbe/0xc90 fs/9p/vfs_super.c:123 legacy_get_tree+0x109/0x220 fs/fs_context.c:611 vfs_get_tree+0x8d/0x350 fs/super.c:1519 do_new_mount fs/namespace.c:3335 [inline] path_mount+0x136e/0x1e70 fs/namespace.c:3662 do_mount fs/namespace.c:3675 [inline] __do_sys_mount fs/namespace.c:3884 [inline] __se_sys_mount fs/namespace.c:3861 [inline] __ia32_sys_mount+0x282/0x300 fs/namespace.c:3861 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline] __do_fast_syscall_32+0x65/0xf0 arch/x86/entry/common.c:178 do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:203 entry_SYSENTER_compat_after_hwframe+0x70/0x82 Freed by task 7255: kasan_save_stack+0x22/0x40 mm/kasan/common.c:45 kasan_set_track+0x25/0x30 mm/kasan/common.c:52 kasan_save_free_info+0x2b/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:1792 [inline] slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1818 slab_free mm/slub.c:3801 [inline] __kmem_cache_free+0xb8/0x2d0 mm/slub.c:3814 p9_client_create+0x7cc/0x1140 net/9p/client.c:1050 v9fs_session_init+0x1e4/0x1980 fs/9p/v9fs.c:410 v9fs_mount+0xbe/0xc90 fs/9p/vfs_super.c:123 legacy_get_tree+0x109/0x220 fs/fs_context.c:611 vfs_get_tree+0x8d/0x350 fs/super.c:1519 do_new_mount fs/namespace.c:3335 [inline] path_mount+0x136e/0x1e70 fs/namespace.c:3662 do_mount fs/namespace.c:3675 [inline] __do_sys_mount fs/namespace.c:3884 [inline] __se_sys_mount fs/namespace.c:3861 [inline] __ia32_sys_mount+0x282/0x300 fs/namespace.c:3861 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline] __do_fast_syscall_32+0x65/0xf0 arch/x86/entry/common.c:178 do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:203 entry_SYSENTER_compat_after_hwframe+0x70/0x82 Last potentially related work creation: kasan_save_stack+0x22/0x40 mm/kasan/common.c:45 __kasan_record_aux_stack+0xb9/0xd0 mm/kasan/generic.c:491 insert_work+0x48/0x360 kernel/workqueue.c:1553 __queue_work+0x625/0x1120 kernel/workqueue.c:1714 call_timer_fn+0x1a0/0x580 kernel/time/timer.c:1700 expire_timers+0xbc/0x4b0 kernel/time/timer.c:1746 __run_timers kernel/time/timer.c:2022 [inline] __run_timers kernel/time/timer.c:1995 [inline] run_timer_softirq+0x326/0x910 kernel/time/timer.c:2035 __do_softirq+0x1d4/0x905 kernel/softirq.c:553 Second to last potentially related work creation: kasan_save_stack+0x22/0x40 mm/kasan/common.c:45 __kasan_record_aux_stack+0xb9/0xd0 mm/kasan/generic.c:491 insert_work+0x48/0x360 kernel/workqueue.c:1553 __queue_work+0x625/0x1120 kernel/workqueue.c:1714 call_timer_fn+0x1a0/0x580 kernel/time/timer.c:1700 expire_timers+0xbc/0x4b0 kernel/time/timer.c:1746 __run_timers kernel/time/timer.c:2022 [inline] __run_timers kernel/time/timer.c:1995 [inline] run_timer_softirq+0x326/0x910 kernel/time/timer.c:2035 __do_softirq+0x1d4/0x905 kernel/softirq.c:553 The buggy address belongs to the object at ffff8880101df400 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 24 bytes inside of freed 512-byte region [ffff8880101df400, ffff8880101df600) The buggy address belongs to the physical page: page:ffffea0000407700 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x101dc head:ffffea0000407700 order:2 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000010200 ffff888012842c80 ffffea00009c4300 dead000000000002 raw: 0000000000000000 0000000080100010 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 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5166, tgid 5166 (syz-executor.2), ts 66558508613, free_ts 66543551803 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x2db/0x350 mm/page_alloc.c:1570 prep_new_page mm/page_alloc.c:1577 [inline] get_page_from_freelist+0xfed/0x2d30 mm/page_alloc.c:3221 __alloc_pages+0x1cb/0x4a0 mm/page_alloc.c:4477 alloc_pages+0x1aa/0x270 mm/mempolicy.c:2279 alloc_slab_page mm/slub.c:1862 [inline] allocate_slab+0x25f/0x390 mm/slub.c:2009 new_slab mm/slub.c:2062 [inline] ___slab_alloc+0xbc3/0x15d0 mm/slub.c:3215 __slab_alloc.constprop.0+0x56/0xa0 mm/slub.c:3314 __slab_alloc_node mm/slub.c:3367 [inline] slab_alloc_node mm/slub.c:3460 [inline] __kmem_cache_alloc_node+0x143/0x350 mm/slub.c:3509 kmalloc_trace+0x26/0xe0 mm/slab_common.c:1076 kmalloc include/linux/slab.h:579 [inline] kzalloc include/linux/slab.h:700 [inline] fib6_info_alloc+0xc9/0x220 net/ipv6/ip6_fib.c:155 ip6_route_info_create+0x341/0x1980 net/ipv6/route.c:3746 ip6_route_add+0x28/0x150 net/ipv6/route.c:3840 addrconf_add_mroute+0x1e0/0x350 net/ipv6/addrconf.c:2489 addrconf_add_dev+0x156/0x1c0 net/ipv6/addrconf.c:2507 inet6_addr_add+0x19f/0xae0 net/ipv6/addrconf.c:2937 inet6_rtm_newaddr+0xfa8/0x1a60 net/ipv6/addrconf.c:4933 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1161 [inline] free_unref_page_prepare+0x62e/0xcb0 mm/page_alloc.c:2348 free_unref_page+0x33/0x370 mm/page_alloc.c:2443 __unfreeze_partials+0x1fe/0x220 mm/slub.c:2647 qlink_free mm/kasan/quarantine.c:166 [inline] qlist_free_all+0x6a/0x170 mm/kasan/quarantine.c:185 kasan_quarantine_reduce+0x195/0x220 mm/kasan/quarantine.c:292 __kasan_slab_alloc+0x63/0x90 mm/kasan/common.c:305 kasan_slab_alloc include/linux/kasan.h:186 [inline] slab_post_alloc_hook mm/slab.h:750 [inline] slab_alloc_node mm/slub.c:3470 [inline] slab_alloc mm/slub.c:3478 [inline] __kmem_cache_alloc_lru mm/slub.c:3485 [inline] kmem_cache_alloc+0x16c/0x380 mm/slub.c:3494 zswap_entry_cache_alloc mm/zswap.c:294 [inline] zswap_frontswap_store+0x56b/0x22e0 mm/zswap.c:1262 __frontswap_store+0x206/0x680 mm/frontswap.c:186 frontswap_store include/linux/frontswap.h:66 [inline] swap_writepage+0xb2/0x1e0 mm/page_io.c:201 pageout+0x38a/0x970 mm/vmscan.c:1355 shrink_folio_list+0x2e41/0x3dc0 mm/vmscan.c:2015 evict_folios+0x794/0x1940 mm/vmscan.c:5181 try_to_shrink_lruvec+0x82c/0xb90 mm/vmscan.c:5357 shrink_one+0x462/0x710 mm/vmscan.c:5401 shrink_many mm/vmscan.c:5453 [inline] lru_gen_shrink_node mm/vmscan.c:5570 [inline] shrink_node+0x20ed/0x3690 mm/vmscan.c:6510 Memory state around the buggy address: ffff8880101df300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880101df380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff8880101df400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880101df480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880101df500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================