===================================================== BUG: KMSAN: use-after-free in __fput+0x42b/0xf20 fs/file_table.c:262 CPU: 1 PID: 26 Comm: kworker/1:1 Not tainted 5.9.0-rc4-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events delayed_fput Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x21c/0x280 lib/dump_stack.c:118 kmsan_report+0xf7/0x1e0 mm/kmsan/kmsan_report.c:122 __msan_warning+0x58/0xa0 mm/kmsan/kmsan_instr.c:201 __fput+0x42b/0xf20 fs/file_table.c:262 delayed_fput+0x7a/0xe0 fs/file_table.c:309 process_one_work+0x1688/0x2140 kernel/workqueue.c:2269 worker_thread+0x10bc/0x2730 kernel/workqueue.c:2415 kthread+0x551/0x590 kernel/kthread.c:293 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 Uninit was created at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:143 [inline] kmsan_internal_poison_shadow+0x66/0xd0 mm/kmsan/kmsan.c:126 kmsan_slab_free+0x6e/0xb0 mm/kmsan/kmsan_hooks.c:105 slab_free_freelist_hook mm/slub.c:1581 [inline] slab_free mm/slub.c:3158 [inline] kmem_cache_free+0x2f7/0xd50 mm/slub.c:3174 file_free_rcu+0x15d/0x190 fs/file_table.c:50 rcu_do_batch kernel/rcu/tree.c:2428 [inline] rcu_core+0xf35/0x1e90 kernel/rcu/tree.c:2656 rcu_core_si+0xe/0x10 kernel/rcu/tree.c:2665 __do_softirq+0x2ea/0x7f5 kernel/softirq.c:299 =====================================================