================================================================== BUG: KASAN: slab-use-after-free in __lock_acquire+0x3ffd/0x5df0 kernel/locking/lockdep.c:4942 Read of size 8 at addr ffff888049eda818 by task kworker/0:2/1262 CPU: 0 PID: 1262 Comm: kworker/0:2 Not tainted 6.3.0-syzkaller-13027-g1a5304fecee5 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014 Workqueue: rcu_gp srcu_invoke_callbacks 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 __lock_acquire+0x3ffd/0x5df0 kernel/locking/lockdep.c:4942 lock_acquire kernel/locking/lockdep.c:5691 [inline] lock_acquire+0x1b1/0x520 kernel/locking/lockdep.c:5656 __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:819 generic_handle_irq_desc include/linux/irqdesc.h:158 [inline] handle_irq arch/x86/kernel/irq.c:231 [inline] __common_interrupt+0xa1/0x220 arch/x86/kernel/irq.c:250 common_interrupt+0xa8/0xd0 arch/x86/kernel/irq.c:240 asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:636 RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline] RIP: 0010:_raw_spin_unlock_irqrestore+0x3c/0x70 kernel/locking/spinlock.c:194 Code: 74 24 10 e8 b6 29 53 f7 48 89 ef e8 de 97 53 f7 81 e3 00 02 00 00 75 25 9c 58 f6 c4 02 75 2d 48 85 db 74 01 fb bf 01 00 00 00 9f 6b 45 f7 65 8b 05 00 eb f0 75 85 c0 74 0a 5b 5d c3 e8 cc 29 RSP: 0018:ffffc90007c4fc30 EFLAGS: 00000206 RAX: 0000000000000016 RBX: 0000000000000200 RCX: 1ffffffff22a6626 RDX: 0000000000000000 RSI: 0000000000000201 RDI: 0000000000000001 RBP: ffffc900003c7c38 R08: 0000000000000001 R09: ffffffff91528d1f R10: 0000000000000001 R11: 0000000000000000 R12: ffff88802c645d60 R13: ffff88802c645c40 R14: ffffffff91e70be0 R15: ffffc900003c7c20 srcu_invoke_callbacks+0x238/0x420 kernel/rcu/srcutree.c:1712 process_one_work+0x99a/0x15e0 kernel/workqueue.c:2405 worker_thread+0x67d/0x10c0 kernel/workqueue.c:2552 kthread+0x344/0x440 kernel/kthread.c:379 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 Allocated by task 8114: 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:559 [inline] p9_client_create+0xb3/0x1140 net/9p/client.c:979 v9fs_session_init+0x1e6/0x1900 fs/9p/v9fs.c:407 v9fs_mount+0xbe/0xca0 fs/9p/vfs_super.c:125 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] __ia32_sys_mount+0x282/0x300 fs/namespace.c:3568 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 8114: 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:3786 [inline] __kmem_cache_free+0xaf/0x2d0 mm/slub.c:3799 p9_client_create+0x7cc/0x1140 net/9p/client.c:1050 v9fs_session_init+0x1e6/0x1900 fs/9p/v9fs.c:407 v9fs_mount+0xbe/0xca0 fs/9p/vfs_super.c:125 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] __ia32_sys_mount+0x282/0x300 fs/namespace.c:3568 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 The buggy address belongs to the object at ffff888049eda800 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 24 bytes inside of freed 512-byte region [ffff888049eda800, ffff888049edaa00) The buggy address belongs to the physical page: page:ffffea000127b600 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888049ed8400 pfn:0x49ed8 head:ffffea000127b600 order:2 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0x4fff00000010200(slab|head|node=1|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 04fff00000010200 ffff888012442c80 dead000000000122 0000000000000000 raw: ffff888049ed8400 000000008010000e 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 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 8073, tgid 8065 (syz-executor.0), ts 236917011331, free_ts 236771356290 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x2db/0x350 mm/page_alloc.c:1722 prep_new_page mm/page_alloc.c:1729 [inline] get_page_from_freelist+0xf41/0x2c00 mm/page_alloc.c:3493 __alloc_pages+0x1cb/0x4a0 mm/page_alloc.c:4759 __alloc_pages_node include/linux/gfp.h:237 [inline] alloc_slab_page mm/slub.c:1853 [inline] allocate_slab+0xa7/0x390 mm/slub.c:1998 new_slab mm/slub.c:2051 [inline] ___slab_alloc+0xa91/0x1400 mm/slub.c:3192 __slab_alloc.constprop.0+0x56/0xa0 mm/slub.c:3291 __slab_alloc_node mm/slub.c:3344 [inline] slab_alloc_node mm/slub.c:3441 [inline] __kmem_cache_alloc_node+0x136/0x320 mm/slub.c:3490 __do_kmalloc_node mm/slab_common.c:965 [inline] __kmalloc_node+0x51/0x1a0 mm/slab_common.c:973 kmalloc_array_node include/linux/slab.h:657 [inline] kcalloc_node include/linux/slab.h:662 [inline] memcg_alloc_slab_cgroups+0x8f/0x150 mm/memcontrol.c:2928 memcg_slab_post_alloc_hook+0xa9/0x390 mm/slab.h:491 slab_post_alloc_hook mm/slab.h:719 [inline] slab_alloc_node mm/slub.c:3451 [inline] slab_alloc mm/slub.c:3459 [inline] __kmem_cache_alloc_lru mm/slub.c:3466 [inline] kmem_cache_alloc+0x1af/0x3b0 mm/slub.c:3475 leaf_new net/ipv4/fib_trie.c:358 [inline] fib_insert_node net/ipv4/fib_trie.c:1114 [inline] fib_insert_alias+0x4fe/0xde0 net/ipv4/fib_trie.c:1164 fib_table_insert+0x9d1/0x1be0 net/ipv4/fib_trie.c:1378 fib_magic+0x493/0x580 net/ipv4/fib_frontend.c:1104 fib_add_ifaddr+0x16f/0x560 net/ipv4/fib_frontend.c:1126 fib_inetaddr_event+0x166/0x2a0 net/ipv4/fib_frontend.c:1440 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+0x62e/0xcb0 mm/page_alloc.c:2555 free_unref_page+0x33/0x370 mm/page_alloc.c:2650 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:711 [inline] slab_alloc_node mm/slub.c:3451 [inline] slab_alloc mm/slub.c:3459 [inline] __kmem_cache_alloc_lru mm/slub.c:3466 [inline] kmem_cache_alloc+0x17c/0x3b0 mm/slub.c:3475 vm_area_dup+0x23/0x300 kernel/fork.c:504 dup_mmap+0x713/0x19d0 kernel/fork.c:712 dup_mm kernel/fork.c:1692 [inline] copy_mm kernel/fork.c:1741 [inline] copy_process+0x65ae/0x7600 kernel/fork.c:2507 kernel_clone+0xeb/0x890 kernel/fork.c:2918 __do_compat_sys_ia32_clone+0x9e/0xd0 arch/x86/kernel/sys_ia32.c:254 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 Memory state around the buggy address: ffff888049eda700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888049eda780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff888049eda800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888049eda880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888049eda900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== ---------------- Code disassembly (best guess): 0: 74 24 je 0x26 2: 10 e8 adc %ch,%al 4: b6 29 mov $0x29,%dh 6: 53 push %rbx 7: f7 48 89 ef e8 de 97 testl $0x97dee8ef,-0x77(%rax) e: 53 push %rbx f: f7 81 e3 00 02 00 00 testl $0x9c257500,0x200e3(%rcx) 16: 75 25 9c 19: 58 pop %rax 1a: f6 c4 02 test $0x2,%ah 1d: 75 2d jne 0x4c 1f: 48 85 db test %rbx,%rbx 22: 74 01 je 0x25 24: fb sti 25: bf 01 00 00 00 mov $0x1,%edi * 2a: e8 9f 6b 45 f7 callq 0xf7456bce <-- trapping instruction 2f: 65 8b 05 00 eb f0 75 mov %gs:0x75f0eb00(%rip),%eax # 0x75f0eb36 36: 85 c0 test %eax,%eax 38: 74 0a je 0x44 3a: 5b pop %rbx 3b: 5d pop %rbp 3c: c3 retq 3d: e8 .byte 0xe8 3e: cc int3 3f: 29 .byte 0x29