R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000018 R13: 00007fff83b838af R14: 00007fa26601e9c0 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:3051 [inline] BUG: KASAN: double-free or invalid-free in kmem_cache_free+0xac/0x610 mm/slub.c:3067 CPU: 1 PID: 3532 Comm: syz-executor.5 Not tainted 5.4.89-syzkaller-00226-ge5e14bf558c4 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1dd/0x24e lib/dump_stack.c:118 print_address_description+0x96/0x640 mm/kasan/report.c:374 kasan_report_invalid_free+0x54/0xc0 mm/kasan/report.c:468 __kasan_slab_free+0x102/0x230 mm/kasan/common.c:459 slab_free_hook mm/slub.c:1453 [inline] slab_free_freelist_hook+0xd0/0x150 mm/slub.c:1486 slab_free mm/slub.c:3051 [inline] kmem_cache_free+0xac/0x610 mm/slub.c:3067 create_cache+0x1cc/0x1f0 mm/slab_common.c:429 kmem_cache_create_usercopy+0x145/0x1d0 mm/slab_common.c:513 p9_client_create+0x9ff/0xb90 net/9p/client.c:1061 v9fs_session_init+0x208/0x1a00 fs/9p/v9fs.c:406 v9fs_mount+0x7f/0x790 fs/9p/vfs_super.c:124 legacy_get_tree+0xde/0x170 fs/fs_context.c:647 vfs_get_tree+0x85/0x260 fs/super.c:1547 do_new_mount fs/namespace.c:2825 [inline] do_mount+0x18ab/0x2660 fs/namespace.c:3145 ksys_mount+0xc2/0xf0 fs/namespace.c:3354 __do_sys_mount fs/namespace.c:3368 [inline] __se_sys_mount fs/namespace.c:3365 [inline] __x64_sys_mount+0xb1/0xc0 fs/namespace.c:3365 do_syscall_64+0xcb/0x150 arch/x86/entry/common.c:290 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:00007fa26601dc68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 000000000045e219 RDX: 0000000020000040 RSI: 0000000020000000 RDI: 0000000000000000 RBP: 00007fa26601dca0 R08: 0000000020000280 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000018 R13: 00007fff83b838af R14: 00007fa26601e9c0 R15: 000000000119bf8c Allocated by task 3532: save_stack mm/kasan/common.c:69 [inline] set_track mm/kasan/common.c:77 [inline] __kasan_kmalloc+0x129/0x1c0 mm/kasan/common.c:510 slab_post_alloc_hook mm/slab.h:584 [inline] slab_alloc_node mm/slub.c:2803 [inline] slab_alloc mm/slub.c:2811 [inline] kmem_cache_alloc+0x1e0/0x270 mm/slub.c:2816 kmem_cache_zalloc include/linux/slab.h:680 [inline] create_cache+0x3b/0x1f0 mm/slab_common.c:400 kmem_cache_create_usercopy+0x145/0x1d0 mm/slab_common.c:513 p9_client_create+0x9ff/0xb90 net/9p/client.c:1061 v9fs_session_init+0x208/0x1a00 fs/9p/v9fs.c:406 v9fs_mount+0x7f/0x790 fs/9p/vfs_super.c:124 legacy_get_tree+0xde/0x170 fs/fs_context.c:647 vfs_get_tree+0x85/0x260 fs/super.c:1547 do_new_mount fs/namespace.c:2825 [inline] do_mount+0x18ab/0x2660 fs/namespace.c:3145 ksys_mount+0xc2/0xf0 fs/namespace.c:3354 __do_sys_mount fs/namespace.c:3368 [inline] __se_sys_mount fs/namespace.c:3365 [inline] __x64_sys_mount+0xb1/0xc0 fs/namespace.c:3365 do_syscall_64+0xcb/0x150 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Freed by task 3532: save_stack mm/kasan/common.c:69 [inline] set_track mm/kasan/common.c:77 [inline] kasan_set_free_info mm/kasan/common.c:332 [inline] __kasan_slab_free+0x17e/0x230 mm/kasan/common.c:471 slab_free_hook mm/slub.c:1453 [inline] slab_free_freelist_hook+0xd0/0x150 mm/slub.c:1486 slab_free mm/slub.c:3051 [inline] kmem_cache_free+0xac/0x610 mm/slub.c:3067 kobject_cleanup+0x1e1/0x3c0 lib/kobject.c:708 sysfs_slab_add+0x1a1/0x310 mm/slub.c:5825 __kmem_cache_create+0x67c/0x6f0 mm/slub.c:4375 create_cache+0x156/0x1f0 mm/slab_common.c:415 kmem_cache_create_usercopy+0x145/0x1d0 mm/slab_common.c:513 p9_client_create+0x9ff/0xb90 net/9p/client.c:1061 v9fs_session_init+0x208/0x1a00 fs/9p/v9fs.c:406 v9fs_mount+0x7f/0x790 fs/9p/vfs_super.c:124 legacy_get_tree+0xde/0x170 fs/fs_context.c:647 vfs_get_tree+0x85/0x260 fs/super.c:1547 do_new_mount fs/namespace.c:2825 [inline] do_mount+0x18ab/0x2660 fs/namespace.c:3145 ksys_mount+0xc2/0xf0 fs/namespace.c:3354 __do_sys_mount fs/namespace.c:3368 [inline] __se_sys_mount fs/namespace.c:3365 [inline] __x64_sys_mount+0xb1/0xc0 fs/namespace.c:3365 do_syscall_64+0xcb/0x150 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x44/0xa9 The buggy address belongs to the object at ffff8881ef6ddb80 which belongs to the cache kmem_cache of size 472 The buggy address is located 0 bytes inside of 472-byte region [ffff8881ef6ddb80, ffff8881ef6ddd58) The buggy address belongs to the page: page:ffffea0007bdb700 refcount:1 mapcount:0 mapping:ffff8881f6002000 index:0xffff8881ef6dcc80 compound_mapcount: 0 flags: 0x8000000000010200(slab|head) raw: 8000000000010200 dead000000000100 dead000000000122 ffff8881f6002000 raw: ffff8881ef6dcc80 00000000800c0008 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8881ef6dda80: fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc fc ffff8881ef6ddb00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff8881ef6ddb80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8881ef6ddc00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881ef6ddc80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================