================================================================== BUG: KASAN: double-free in tcp_disconnect+0x980/0x1e20 net/ipv4/tcp.c:3145 CPU: 1 PID: 11538 Comm: kworker/1:17 Not tainted 6.0.0-syzkaller-09039-ga6afa4199d3d #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022 Workqueue: events mptcp_worker Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:317 [inline] print_report.cold+0x2ba/0x6e9 mm/kasan/report.c:433 kasan_report_invalid_free+0x81/0x190 mm/kasan/report.c:462 ____kasan_slab_free+0x162/0x1a0 mm/kasan/common.c:356 kasan_slab_free include/linux/kasan.h:200 [inline] __cache_free mm/slab.c:3418 [inline] kfree+0x173/0x390 mm/slab.c:3786 tcp_disconnect+0x980/0x1e20 net/ipv4/tcp.c:3145 __mptcp_close_ssk+0x5ca/0x7e0 net/mptcp/protocol.c:2327 mptcp_do_fastclose net/mptcp/protocol.c:2592 [inline] mptcp_worker+0x78c/0xff0 net/mptcp/protocol.c:2627 process_one_work+0x991/0x1610 kernel/workqueue.c:2289 worker_thread+0x665/0x1080 kernel/workqueue.c:2436 kthread+0x2e4/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 Allocated by task 27718: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:437 [inline] ____kasan_kmalloc mm/kasan/common.c:516 [inline] ____kasan_kmalloc mm/kasan/common.c:475 [inline] __kasan_kmalloc+0xa6/0xd0 mm/kasan/common.c:525 kasan_kmalloc include/linux/kasan.h:234 [inline] __do_kmalloc mm/slab.c:3686 [inline] __kmalloc+0x1f9/0x4a0 mm/slab.c:3695 kmalloc include/linux/slab.h:605 [inline] kzalloc include/linux/slab.h:733 [inline] apply_wqattrs_prepare+0xb1/0xa80 kernel/workqueue.c:3963 apply_workqueue_attrs_locked+0xc1/0x140 kernel/workqueue.c:4075 apply_workqueue_attrs kernel/workqueue.c:4112 [inline] alloc_and_link_pwqs kernel/workqueue.c:4236 [inline] alloc_workqueue+0x944/0x1100 kernel/workqueue.c:4344 kvm_mmu_init_tdp_mmu+0x8e/0x230 arch/x86/kvm/mmu/tdp_mmu.c:24 kvm_mmu_init_vm+0x128/0x350 arch/x86/kvm/mmu/mmu.c:5965 kvm_arch_init_vm+0x64/0x720 arch/x86/kvm/x86.c:12079 kvm_create_vm arch/x86/kvm/../../../virt/kvm/kvm_main.c:1203 [inline] kvm_dev_ioctl_create_vm arch/x86/kvm/../../../virt/kvm/kvm_main.c:4912 [inline] kvm_dev_ioctl+0xb15/0x1cf0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:4954 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+0x193/0x200 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd The buggy address belongs to the object at ffff888055293d00 which belongs to the cache kmalloc-64 of size 64 The buggy address is located 0 bytes inside of 64-byte region [ffff888055293d00, ffff888055293d40) The buggy address belongs to the physical page: page:ffffea000154a4c0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x55293 flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000200 ffffea0000afc288 ffffea000073c148 ffff888011840200 raw: 0000000000000000 ffff888055293000 0000000100000020 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x342040(__GFP_IO|__GFP_NOWARN|__GFP_COMP|__GFP_HARDWALL|__GFP_THISNODE), pid 13916, tgid 13916 (udevd), ts 794963358077, free_ts 794959804468 prep_new_page mm/page_alloc.c:2532 [inline] get_page_from_freelist+0x109b/0x2ce0 mm/page_alloc.c:4283 __alloc_pages+0x1c7/0x510 mm/page_alloc.c:5549 __alloc_pages_node include/linux/gfp.h:243 [inline] kmem_getpages mm/slab.c:1363 [inline] cache_grow_begin+0x75/0x360 mm/slab.c:2569 cache_alloc_refill+0x27f/0x380 mm/slab.c:2942 ____cache_alloc mm/slab.c:3018 [inline] ____cache_alloc mm/slab.c:3001 [inline] __do_cache_alloc mm/slab.c:3246 [inline] slab_alloc mm/slab.c:3287 [inline] __do_kmalloc mm/slab.c:3684 [inline] __kmalloc+0x3a1/0x4a0 mm/slab.c:3695 kmalloc include/linux/slab.h:605 [inline] kzalloc include/linux/slab.h:733 [inline] tomoyo_encode2.part.0+0xe9/0x3a0 security/tomoyo/realpath.c:45 tomoyo_encode2 security/tomoyo/realpath.c:31 [inline] tomoyo_encode+0x28/0x50 security/tomoyo/realpath.c:80 tomoyo_realpath_from_path+0x181/0x600 security/tomoyo/realpath.c:283 tomoyo_get_realpath security/tomoyo/file.c:151 [inline] tomoyo_path_number_perm+0x205/0x550 security/tomoyo/file.c:723 tomoyo_path_mknod+0x10d/0x190 security/tomoyo/tomoyo.c:239 security_path_mknod+0xf9/0x170 security/security.c:1150 may_o_create fs/namei.c:3235 [inline] lookup_open.isra.0+0x49f/0x12a0 fs/namei.c:3376 open_last_lookups fs/namei.c:3481 [inline] path_openat+0x996/0x28f0 fs/namei.c:3688 do_filp_open+0x1b6/0x400 fs/namei.c:3718 do_sys_openat2+0x16d/0x4c0 fs/open.c:1310 do_sys_open fs/open.c:1326 [inline] __do_sys_openat fs/open.c:1342 [inline] __se_sys_openat fs/open.c:1337 [inline] __x64_sys_openat+0x13f/0x1f0 fs/open.c:1337 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1449 [inline] free_pcp_prepare+0x5e4/0xd20 mm/page_alloc.c:1499 free_unref_page_prepare mm/page_alloc.c:3380 [inline] free_unref_page+0x19/0x4d0 mm/page_alloc.c:3476 slab_destroy mm/slab.c:1615 [inline] slabs_destroy+0x89/0xc0 mm/slab.c:1635 cache_flusharray mm/slab.c:3389 [inline] ___cache_free+0x2a8/0x3d0 mm/slab.c:3452 qlink_free mm/kasan/quarantine.c:168 [inline] qlist_free_all+0x4f/0x1b0 mm/kasan/quarantine.c:187 kasan_quarantine_reduce+0x180/0x200 mm/kasan/quarantine.c:294 __kasan_slab_alloc+0x97/0xb0 mm/kasan/common.c:447 kasan_slab_alloc include/linux/kasan.h:224 [inline] slab_post_alloc_hook mm/slab.h:727 [inline] slab_alloc mm/slab.c:3294 [inline] __kmem_cache_alloc_lru mm/slab.c:3471 [inline] kmem_cache_alloc_lru+0x23d/0x860 mm/slab.c:3498 alloc_inode_sb include/linux/fs.h:3107 [inline] shmem_alloc_inode+0x23/0x50 mm/shmem.c:3819 alloc_inode+0x61/0x230 fs/inode.c:259 new_inode_pseudo fs/inode.c:1018 [inline] new_inode+0x27/0x270 fs/inode.c:1046 shmem_get_inode+0x19b/0xe40 mm/shmem.c:2327 shmem_symlink+0xe2/0x560 mm/shmem.c:3100 vfs_symlink fs/namei.c:4378 [inline] vfs_symlink+0x365/0x5b0 fs/namei.c:4363 do_symlinkat+0x261/0x2e0 fs/namei.c:4407 __do_sys_symlink fs/namei.c:4429 [inline] __se_sys_symlink fs/namei.c:4427 [inline] __x64_sys_symlink+0x75/0x90 fs/namei.c:4427 Memory state around the buggy address: ffff888055293c00: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff888055293c80: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc >ffff888055293d00: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ^ ffff888055293d80: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff888055293e00: 00 00 00 00 00 00 00 07 fc fc fc fc fc fc fc fc ==================================================================