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WARNING: CPU: 1 PID: 52 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: 52 Comm: kworker/1:1 Not tainted 5.7.0-rc6-syzkaller #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014
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 82 79 dd fd e8 7d 79 dd fd <0f> 0b eb c2 4c 89 e7 e8 51 5a 1b fe eb dc e8 ca 59 1b fe eb aa 4c
RSP: 0018:ffffc90000697cc8 EFLAGS: 00010293
RAX: ffff88802bf74e80 RBX: ffff88801e057000 RCX: ffffffff8395bb3d
RDX: 0000000000000000 RSI: ffffffff8395bba3 RDI: ffff88801e057018
RBP: 0000607f810655f8 R08: ffff88802bf74e80 R09: fffffbfff185dd51
R10: ffffffff8c2eea87 R11: fffffbfff185dd50 R12: ffff88801e057008
R13: ffff88801e0571a8 R14: ffff88801e057100 R15: 0000000000000000
 io_ring_ctx_free fs/io_uring.c:7239 [inline]
 io_ring_exit_work+0x315/0x6a0 fs/io_uring.c:7298
 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..