R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000020 R13: 00007ffd346438af R14: 00007f86a7e109c0 R15: 000000000119bf8c kobject_add_internal failed for 9p-fcall-cache (error: -12 parent: slab) ================================================================== BUG: KASAN: double-free or invalid-free in slab_free mm/slub.c:3142 [inline] BUG: KASAN: double-free or invalid-free in kmem_cache_free+0x82/0x350 mm/slub.c:3158 CPU: 1 PID: 19684 Comm: syz-executor.0 Not tainted 5.11.0-rc4-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x107/0x163 lib/dump_stack.c:120 print_address_description.constprop.0.cold+0x5b/0x2f8 mm/kasan/report.c:230 kasan_report_invalid_free+0x51/0x80 mm/kasan/report.c:355 ____kasan_slab_free+0xfd/0x110 mm/kasan/common.c:341 kasan_slab_free include/linux/kasan.h:192 [inline] slab_free_hook mm/slub.c:1547 [inline] slab_free_freelist_hook+0x5d/0x150 mm/slub.c:1580 slab_free mm/slub.c:3142 [inline] kmem_cache_free+0x82/0x350 mm/slub.c:3158 create_cache mm/slab_common.c:269 [inline] kmem_cache_create_usercopy+0x2ab/0x300 mm/slab_common.c:352 p9_client_create+0xc9f/0x1110 net/9p/client.c:1063 v9fs_session_init+0x1dd/0x1770 fs/9p/v9fs.c:406 v9fs_mount+0x79/0x9c0 fs/9p/vfs_super.c:126 legacy_get_tree+0x105/0x220 fs/fs_context.c:592 vfs_get_tree+0x89/0x2f0 fs/super.c:1496 do_new_mount fs/namespace.c:2881 [inline] path_mount+0x13ad/0x20c0 fs/namespace.c:3211 do_mount fs/namespace.c:3224 [inline] __do_sys_mount fs/namespace.c:3432 [inline] __se_sys_mount fs/namespace.c:3409 [inline] __x64_sys_mount+0x27f/0x300 fs/namespace.c:3409 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45e219 Code: 0d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 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 0f 83 db b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f86a7e0fc68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0000000000000007 RCX: 000000000045e219 RDX: 0000000020000280 RSI: 00000000200002c0 RDI: 0000000000000000 RBP: 00007f86a7e0fca0 R08: 0000000020000480 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000020 R13: 00007ffd346438af R14: 00007f86a7e109c0 R15: 000000000119bf8c Allocated by task 19684: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:401 [inline] ____kasan_kmalloc.constprop.0+0x82/0xa0 mm/kasan/common.c:429 kasan_slab_alloc include/linux/kasan.h:209 [inline] slab_post_alloc_hook mm/slab.h:512 [inline] slab_alloc_node mm/slub.c:2891 [inline] slab_alloc mm/slub.c:2899 [inline] kmem_cache_alloc+0x1c6/0x440 mm/slub.c:2904 kmem_cache_zalloc include/linux/slab.h:672 [inline] create_cache mm/slab_common.c:246 [inline] kmem_cache_create_usercopy+0x1a6/0x300 mm/slab_common.c:352 p9_client_create+0xc9f/0x1110 net/9p/client.c:1063 v9fs_session_init+0x1dd/0x1770 fs/9p/v9fs.c:406 v9fs_mount+0x79/0x9c0 fs/9p/vfs_super.c:126 legacy_get_tree+0x105/0x220 fs/fs_context.c:592 vfs_get_tree+0x89/0x2f0 fs/super.c:1496 do_new_mount fs/namespace.c:2881 [inline] path_mount+0x13ad/0x20c0 fs/namespace.c:3211 do_mount fs/namespace.c:3224 [inline] __do_sys_mount fs/namespace.c:3432 [inline] __se_sys_mount fs/namespace.c:3409 [inline] __x64_sys_mount+0x27f/0x300 fs/namespace.c:3409 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Freed by task 19684: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_set_track+0x1c/0x30 mm/kasan/common.c:46 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:356 ____kasan_slab_free+0xe1/0x110 mm/kasan/common.c:362 kasan_slab_free include/linux/kasan.h:192 [inline] slab_free_hook mm/slub.c:1547 [inline] slab_free_freelist_hook+0x5d/0x150 mm/slub.c:1580 slab_free mm/slub.c:3142 [inline] kmem_cache_free+0x82/0x350 mm/slub.c:3158 kobject_cleanup lib/kobject.c:705 [inline] kobject_release lib/kobject.c:736 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x1c8/0x540 lib/kobject.c:753 sysfs_slab_add+0x164/0x1d0 mm/slub.c:5628 __kmem_cache_create+0x471/0x5a0 mm/slub.c:4444 create_cache mm/slab_common.c:257 [inline] kmem_cache_create_usercopy+0x1ed/0x300 mm/slab_common.c:352 p9_client_create+0xc9f/0x1110 net/9p/client.c:1063 v9fs_session_init+0x1dd/0x1770 fs/9p/v9fs.c:406 v9fs_mount+0x79/0x9c0 fs/9p/vfs_super.c:126 legacy_get_tree+0x105/0x220 fs/fs_context.c:592 vfs_get_tree+0x89/0x2f0 fs/super.c:1496 do_new_mount fs/namespace.c:2881 [inline] path_mount+0x13ad/0x20c0 fs/namespace.c:3211 do_mount fs/namespace.c:3224 [inline] __do_sys_mount fs/namespace.c:3432 [inline] __se_sys_mount fs/namespace.c:3409 [inline] __x64_sys_mount+0x27f/0x300 fs/namespace.c:3409 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 The buggy address belongs to the object at ffff8880168a5dc0 which belongs to the cache kmem_cache of size 224 The buggy address is located 0 bytes inside of 224-byte region [ffff8880168a5dc0, ffff8880168a5ea0) The buggy address belongs to the page: page:00000000defabc87 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff8880168a5a00 pfn:0x168a5 flags: 0xfff00000000200(slab) raw: 00fff00000000200 dead000000000100 dead000000000122 ffff888010041000 raw: ffff8880168a5a00 00000000800c0004 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880168a5c80: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880168a5d00: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc >ffff8880168a5d80: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb ^ ffff8880168a5e00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880168a5e80: fb fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc 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