R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 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:3143 [inline] BUG: KASAN: double-free or invalid-free in kmem_cache_free+0x82/0x350 mm/slub.c:3159 CPU: 0 PID: 16171 Comm: syz-executor.2 Not tainted 5.11.0-rc5-syzkaller #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014 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:3143 [inline] kmem_cache_free+0x82/0x350 mm/slub.c:3159 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] __ia32_sys_mount+0x27e/0x300 fs/namespace.c:3409 do_syscall_32_irqs_on arch/x86/entry/common.c:77 [inline] __do_fast_syscall_32+0x56/0x80 arch/x86/entry/common.c:139 do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:164 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c RIP: 0023:0xf7f22549 Code: 03 74 c0 01 10 05 03 74 b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90 RSP: 002b:00000000f551c0bc EFLAGS: 00000296 ORIG_RAX: 0000000000000015 RAX: ffffffffffffffda RBX: 0000000020000140 RCX: 0000000020000180 RDX: 00000000200001c0 RSI: 0000000000000000 RDI: 0000000020000080 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Allocated by task 16171: 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:2892 [inline] slab_alloc mm/slub.c:2900 [inline] kmem_cache_alloc+0x1c6/0x440 mm/slub.c:2905 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] __ia32_sys_mount+0x27e/0x300 fs/namespace.c:3409 do_syscall_32_irqs_on arch/x86/entry/common.c:77 [inline] __do_fast_syscall_32+0x56/0x80 arch/x86/entry/common.c:139 do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:164 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c Freed by task 16171: 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:3143 [inline] kmem_cache_free+0x82/0x350 mm/slub.c:3159 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:5629 __kmem_cache_create+0x471/0x5a0 mm/slub.c:4445 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] __ia32_sys_mount+0x27e/0x300 fs/namespace.c:3409 do_syscall_32_irqs_on arch/x86/entry/common.c:77 [inline] __do_fast_syscall_32+0x56/0x80 arch/x86/entry/common.c:139 do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:164 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c The buggy address belongs to the object at ffff888041a92500 which belongs to the cache kmem_cache of size 224 The buggy address is located 0 bytes inside of 224-byte region [ffff888041a92500, ffff888041a925e0) The buggy address belongs to the page: page:00000000bbe9a3e8 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888041a923c0 pfn:0x41a92 flags: 0x4fff00000000200(slab) raw: 04fff00000000200 dead000000000100 dead000000000122 ffff888010041000 raw: ffff888041a923c0 00000000800c000a 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888041a92400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888041a92480: fb fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc >ffff888041a92500: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888041a92580: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ffff888041a92600: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================