------------[ cut here ]------------ WARNING: CPU: 1 PID: 3399 at lib/percpu-refcount.c:112 percpu_ref_exit+0xa3/0xd0 lib/percpu-refcount.c:112 Kernel panic - not syncing: panic_on_warn set ... CPU: 1 PID: 3399 Comm: kworker/1:11 Not tainted 5.7.0-rc7-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events io_ring_exit_work Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x188/0x20d lib/dump_stack.c:118 panic+0x2e3/0x75c kernel/panic.c:221 __warn.cold+0x2f/0x35 kernel/panic.c:582 report_bug+0x27b/0x2f0 lib/bug.c:195 fixup_bug arch/x86/kernel/traps.c:175 [inline] fixup_bug arch/x86/kernel/traps.c:170 [inline] do_error_trap+0x12b/0x220 arch/x86/kernel/traps.c:267 do_invalid_op+0x32/0x40 arch/x86/kernel/traps.c:286 invalid_op+0x23/0x30 arch/x86/entry/entry_64.S:1027 RIP: 0010:percpu_ref_exit+0xa3/0xd0 lib/percpu-refcount.c:112 Code: 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 75 1a 48 c7 43 08 03 00 00 00 5b 5d 41 5c e9 a2 77 dd fd e8 9d 77 dd fd <0f> 0b eb c2 4c 89 e7 e8 c1 58 1b fe eb dc e8 3a 58 1b fe eb aa 4c RSP: 0018:ffffc9000202fcc8 EFLAGS: 00010293 RAX: ffff88809d63e000 RBX: ffff8880a8b96000 RCX: ffffffff8395c69d RDX: 0000000000000000 RSI: ffffffff8395c703 RDI: ffff8880a8b96018 RBP: 0000607f516ad3c8 R08: ffff88809d63e000 R09: fffffbfff185df59 R10: ffffffff8c2efac7 R11: fffffbfff185df58 R12: ffff8880a8b96008 R13: ffff8880a8b961a8 R14: ffff8880a8b96100 R15: 0000000000000000 io_ring_ctx_free fs/io_uring.c:7247 [inline] io_ring_exit_work+0x315/0x6a0 fs/io_uring.c:7306 process_one_work+0x965/0x16a0 kernel/workqueue.c:2268 worker_thread+0x96/0xe20 kernel/workqueue.c:2414 kthread+0x388/0x470 kernel/kthread.c:268 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:351 Kernel Offset: disabled Rebooting in 86400 seconds..