================================================================== BUG: KASAN: slab-use-after-free in __mutex_lock_common kernel/locking/mutex.c:582 [inline] BUG: KASAN: slab-use-after-free in __mutex_lock+0x1029/0x1350 kernel/locking/mutex.c:747 Read of size 8 at addr ffff88802260ea68 by task syz-executor.5/12421 CPU: 1 PID: 12421 Comm: syz-executor.5 Not tainted 6.4.0-rc7-next-20230623-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023 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:364 print_report mm/kasan/report.c:475 [inline] kasan_report+0x11d/0x130 mm/kasan/report.c:588 __mutex_lock_common kernel/locking/mutex.c:582 [inline] __mutex_lock+0x1029/0x1350 kernel/locking/mutex.c:747 __vhost_vq_attach_worker+0xe7/0x390 drivers/vhost/vhost.c:678 vhost_dev_set_owner+0x670/0xa60 drivers/vhost/vhost.c:892 vhost_net_set_owner drivers/vhost/net.c:1687 [inline] vhost_net_ioctl+0x668/0x16a0 drivers/vhost/net.c:1737 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl fs/ioctl.c:856 [inline] __x64_sys_ioctl+0x19d/0x210 fs/ioctl.c:856 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: 0033:0x7fcaa2a8c389 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 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:00007fcaa37fc168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fcaa2babf80 RCX: 00007fcaa2a8c389 RDX: 0000000000000000 RSI: 000040000000af01 RDI: 0000000000000003 RBP: 00007fcaa2ad7493 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffceb57ccbf R14: 00007fcaa37fc300 R15: 0000000000022000 Allocated by task 12421: 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] kzalloc include/linux/slab.h:700 [inline] vhost_worker_create+0x9c/0x320 drivers/vhost/vhost.c:627 vhost_dev_set_owner+0x5b9/0xa60 drivers/vhost/vhost.c:885 vhost_net_set_owner drivers/vhost/net.c:1687 [inline] vhost_net_ioctl+0x668/0x16a0 drivers/vhost/net.c:1737 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl fs/ioctl.c:856 [inline] __x64_sys_ioctl+0x19d/0x210 fs/ioctl.c:856 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 Freed by task 12423: 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:164 [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 vhost_worker_destroy drivers/vhost/vhost.c:600 [inline] vhost_workers_free drivers/vhost/vhost.c:615 [inline] vhost_dev_cleanup+0x66b/0x850 drivers/vhost/vhost.c:991 vhost_dev_reset_owner+0x25/0x160 drivers/vhost/vhost.c:923 vhost_net_reset_owner drivers/vhost/net.c:1621 [inline] vhost_net_ioctl+0x807/0x16a0 drivers/vhost/net.c:1735 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl fs/ioctl.c:856 [inline] __x64_sys_ioctl+0x19d/0x210 fs/ioctl.c:856 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 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 kvfree_call_rcu+0x70/0xbc0 kernel/rcu/tree.c:3368 drop_sysctl_table+0x3c2/0x4e0 fs/proc/proc_sysctl.c:1506 unregister_sysctl_table fs/proc/proc_sysctl.c:1527 [inline] unregister_sysctl_table+0x41/0x60 fs/proc/proc_sysctl.c:1519 ip6_frags_ns_sysctl_unregister net/ipv6/reassembly.c:492 [inline] ipv6_frags_exit_net+0x5c/0xc0 net/ipv6/reassembly.c:555 ops_exit_list+0xb0/0x170 net/core/net_namespace.c:170 setup_net+0x64c/0xa40 net/core/net_namespace.c:362 copy_net_ns+0x334/0x6c0 net/core/net_namespace.c:491 create_new_namespaces+0x3f6/0xb20 kernel/nsproxy.c:110 unshare_nsproxy_namespaces+0xc1/0x1f0 kernel/nsproxy.c:228 ksys_unshare+0x449/0x920 kernel/fork.c:3437 __do_sys_unshare kernel/fork.c:3508 [inline] __se_sys_unshare kernel/fork.c:3506 [inline] __x64_sys_unshare+0x31/0x40 kernel/fork.c:3506 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+0xb9/0xd0 mm/kasan/generic.c:491 kvfree_call_rcu+0x70/0xbc0 kernel/rcu/tree.c:3368 drop_sysctl_table+0x3c2/0x4e0 fs/proc/proc_sysctl.c:1506 unregister_sysctl_table fs/proc/proc_sysctl.c:1527 [inline] unregister_sysctl_table+0x41/0x60 fs/proc/proc_sysctl.c:1519 mpls_net_exit+0x6a/0x320 net/mpls/af_mpls.c:2709 ops_exit_list+0xb0/0x170 net/core/net_namespace.c:170 setup_net+0x64c/0xa40 net/core/net_namespace.c:362 copy_net_ns+0x334/0x6c0 net/core/net_namespace.c:491 create_new_namespaces+0x3f6/0xb20 kernel/nsproxy.c:110 unshare_nsproxy_namespaces+0xc1/0x1f0 kernel/nsproxy.c:228 ksys_unshare+0x449/0x920 kernel/fork.c:3437 __do_sys_unshare kernel/fork.c:3508 [inline] __se_sys_unshare kernel/fork.c:3506 [inline] __x64_sys_unshare+0x31/0x40 kernel/fork.c:3506 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 The buggy address belongs to the object at ffff88802260ea00 which belongs to the cache kmalloc-cg-192 of size 192 The buggy address is located 104 bytes inside of freed 192-byte region [ffff88802260ea00, ffff88802260eac0) The buggy address belongs to the physical page: page:ffffea0000898380 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88802260e300 pfn:0x2260e memcg:ffff88807bd3ac01 anon flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000000200 ffff88801284ddc0 0000000000000000 0000000000000001 raw: ffff88802260e300 000000008010000e 00000001ffffffff ffff88807bd3ac01 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x116cc0(GFP_USER|__GFP_NOWARN|__GFP_RETRY_MAYFAIL|__GFP_NORETRY), pid 10424, tgid 10400 (syz-executor.1), ts 582100258228, free_ts 582041661121 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+0xfd9/0x2c40 mm/page_alloc.c:3257 __alloc_pages+0x1cb/0x4a0 mm/page_alloc.c:4513 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 __do_kmalloc_node mm/slab_common.c:984 [inline] __kmalloc_node+0x51/0x1a0 mm/slab_common.c:992 kmalloc_node include/linux/slab.h:599 [inline] kvmalloc_node+0xa2/0x1a0 mm/util.c:604 kvmalloc include/linux/slab.h:717 [inline] kvzalloc include/linux/slab.h:725 [inline] netif_alloc_rx_queues net/core/dev.c:9847 [inline] alloc_netdev_mqs+0xbde/0x1270 net/core/dev.c:10660 __ip_tunnel_create+0x2ec/0x670 net/ipv4/ip_tunnel.c:254 ip_tunnel_init_net+0x1f9/0x5d0 net/ipv4/ip_tunnel.c:1091 vti_init_net+0x2f/0x140 net/ipv4/ip_vti.c:504 ops_init+0xb9/0x6b0 net/core/net_namespace.c:136 setup_net+0x422/0xa40 net/core/net_namespace.c:339 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:2384 free_unref_page+0x33/0x370 mm/page_alloc.c:2479 __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:188 [inline] slab_post_alloc_hook mm/slab.h:750 [inline] kmem_cache_alloc_bulk+0x424/0x860 mm/slub.c:4048 mt_alloc_bulk lib/maple_tree.c:164 [inline] mas_alloc_nodes+0x341/0x8b0 lib/maple_tree.c:1304 mas_node_count_gfp lib/maple_tree.c:1362 [inline] mas_preallocate+0x1bb/0x360 lib/maple_tree.c:5546 vma_iter_prealloc mm/internal.h:1032 [inline] __split_vma+0x1b7/0x830 mm/mmap.c:2266 do_vmi_align_munmap+0x2c6/0x16c0 mm/mmap.c:2379 do_vmi_munmap+0x26e/0x2c0 mm/mmap.c:2544 mmap_region+0x1f3/0x2570 mm/mmap.c:2592 do_mmap+0x837/0xea0 mm/mmap.c:1373 vm_mmap_pgoff+0x1a4/0x3b0 mm/util.c:543 ksys_mmap_pgoff+0x42b/0x5b0 mm/mmap.c:1419 Memory state around the buggy address: ffff88802260e900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88802260e980: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc >ffff88802260ea00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88802260ea80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff88802260eb00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 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