================================================================== BUG: KASAN: slab-use-after-free in instrument_atomic_read include/linux/instrumented.h:68 [inline] BUG: KASAN: slab-use-after-free in atomic_long_read include/linux/atomic/atomic-instrumented.h:3188 [inline] BUG: KASAN: slab-use-after-free in __mutex_unlock_slowpath+0xef/0x5c0 kernel/locking/mutex.c:921 Read of size 8 at addr ffff888116331880 by task vhost-3430/3431 CPU: 1 PID: 3431 Comm: vhost-3430 Not tainted 6.9.0-rc4-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x108/0x280 lib/dump_stack.c:114 print_address_description mm/kasan/report.c:377 [inline] print_report+0x169/0x550 mm/kasan/report.c:488 kasan_report+0x143/0x180 mm/kasan/report.c:601 kasan_check_range+0x282/0x290 mm/kasan/generic.c:189 instrument_atomic_read include/linux/instrumented.h:68 [inline] atomic_long_read include/linux/atomic/atomic-instrumented.h:3188 [inline] __mutex_unlock_slowpath+0xef/0x5c0 kernel/locking/mutex.c:921 vhost_task_fn+0x2b1/0x2e0 kernel/vhost_task.c:65 ret_from_fork+0x32/0x60 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Allocated by task 3430: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:370 [inline] __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:387 kasan_kmalloc include/linux/kasan.h:211 [inline] kmalloc_trace+0x1c9/0x3a0 mm/slub.c:3997 kmalloc include/linux/slab.h:628 [inline] kzalloc include/linux/slab.h:749 [inline] vhost_task_create+0x142/0x2e0 kernel/vhost_task.c:134 vhost_worker_create+0x172/0x360 drivers/vhost/vhost.c:667 vhost_dev_set_owner+0x3b3/0x8a0 drivers/vhost/vhost.c:945 vhost_dev_ioctl+0xbd/0xba0 drivers/vhost/vhost.c:2108 vhost_vsock_dev_ioctl+0x6af/0xd10 drivers/vhost/vsock.c:875 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:904 [inline] __se_sys_ioctl+0xab/0xf0 fs/ioctl.c:890 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x8f/0x1a0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 3429: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:579 poison_slab_object+0xee/0x1a0 mm/kasan/common.c:240 __kasan_slab_free+0x37/0x60 mm/kasan/common.c:256 kasan_slab_free include/linux/kasan.h:184 [inline] slab_free_hook mm/slub.c:2106 [inline] slab_free mm/slub.c:4280 [inline] kfree+0x139/0x350 mm/slub.c:4390 vhost_worker_destroy drivers/vhost/vhost.c:629 [inline] vhost_workers_free drivers/vhost/vhost.c:648 [inline] vhost_dev_cleanup+0x83d/0xa30 drivers/vhost/vhost.c:1051 vhost_vsock_dev_release+0x33b/0x3a0 drivers/vhost/vsock.c:751 __fput+0x301/0x670 fs/file_table.c:422 __do_sys_close fs/open.c:1556 [inline] __se_sys_close+0x11d/0x170 fs/open.c:1541 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x8f/0x1a0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff888116331800 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 128 bytes inside of freed 512-byte region [ffff888116331800, ffff888116331a00) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x116330 head: order:2 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0x200000000000840(slab|head|node=0|zone=2) page_type: 0xffffffff() raw: 0200000000000840 ffff888100041c80 dead000000000100 dead000000000122 raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000 head: 0200000000000840 ffff888100041c80 dead000000000100 dead000000000122 head: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000 head: 0200000000000002 ffffea000458cc01 dead000000000122 00000000ffffffff head: 0000000400000000 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1958, tgid 1958 (udevd), ts 7849636983, free_ts 5697807279 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x10f/0x130 mm/page_alloc.c:1534 prep_new_page mm/page_alloc.c:1541 [inline] get_page_from_freelist+0x33de/0x3580 mm/page_alloc.c:3317 __alloc_pages+0x256/0x670 mm/page_alloc.c:4575 __alloc_pages_node include/linux/gfp.h:238 [inline] alloc_pages_node include/linux/gfp.h:261 [inline] alloc_slab_page+0x5f/0x160 mm/slub.c:2175 allocate_slab mm/slub.c:2338 [inline] new_slab+0x70/0x270 mm/slub.c:2391 ___slab_alloc+0xb0d/0x1040 mm/slub.c:3525 __slab_alloc mm/slub.c:3610 [inline] __slab_alloc_node mm/slub.c:3663 [inline] slab_alloc_node mm/slub.c:3835 [inline] kmalloc_trace+0x254/0x3a0 mm/slub.c:3992 kmalloc include/linux/slab.h:628 [inline] kzalloc include/linux/slab.h:749 [inline] kernfs_fop_open+0x309/0xaf0 fs/kernfs/file.c:623 do_dentry_open+0x74c/0x11c0 fs/open.c:955 do_open fs/namei.c:3642 [inline] path_openat+0x225a/0x27f0 fs/namei.c:3799 do_filp_open+0x22b/0x440 fs/namei.c:3826 do_sys_openat2+0xf6/0x180 fs/open.c:1406 do_sys_open fs/open.c:1421 [inline] __do_sys_openat fs/open.c:1437 [inline] __se_sys_openat fs/open.c:1432 [inline] __x64_sys_openat+0x20d/0x260 fs/open.c:1432 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x8f/0x1a0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f page last free pid 9 tgid 9 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1141 [inline] free_unref_page_prepare+0x87f/0x9a0 mm/page_alloc.c:2347 free_unref_page+0x37/0x3a0 mm/page_alloc.c:2487 vfree+0x10e/0x210 mm/vmalloc.c:3340 delayed_vfree_work+0x3c/0x70 mm/vmalloc.c:3261 process_one_work kernel/workqueue.c:3254 [inline] process_scheduled_works+0x8b6/0x12f0 kernel/workqueue.c:3335 worker_thread+0x869/0xca0 kernel/workqueue.c:3416 kthread+0x268/0x2c0 kernel/kthread.c:388 ret_from_fork+0x32/0x60 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Memory state around the buggy address: ffff888116331780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888116331800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888116331880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888116331900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888116331980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================