Hello, When using Healer to fuzz the latest Linux kernel, the following crash was triggered. HEAD commit: 519d81956ee2 Linux 5.15-rc6 git tree: upstream console output: https://drive.google.com/file/d/1d_-yYvTUew4bWhNCFt9Fs2zdpijQwnwd/view?usp=sharing kernel config: https://drive.google.com/file/d/12PUnxIM1EPBgW4ZJmI7WJBRaY1lA83an/view?usp=sharing Sorry, I don't have a reproducer for this crash, hope the symbolized report can help. If you fix this issue, please add the following tag to the commit: Reported-by: Hao Sun <sunhao.th@xxxxxxxxx> ------------[ cut here ]------------ WARNING: CPU: 2 PID: 16505 at fs/io_uring.c:9413 io_ring_exit_work+0x23e/0x1550 fs/io_uring.c:9413 Modules linked in: CPU: 2 PID: 16505 Comm: kworker/u9:6 Not tainted 5.15.0-rc6 #4 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1.1 04/01/2014 Workqueue: events_unbound io_ring_exit_work RIP: 0010:io_ring_exit_work+0x23e/0x1550 fs/io_uring.c:9413 Code: 00 0f 85 67 0f 00 00 48 8b 05 ce b4 7c 09 31 ff 4c 8b 64 24 40 49 29 c4 4c 89 e6 e8 7c 23 92 ff 4d 85 e4 79 0d e8 f2 21 92 ff <0f> 0b 41 bd 70 17 00 00 e8 e5 21 92 ff 4c 89 ee 4c 89 ff e8 6a 42 RSP: 0018:ffffc90001fafbb0 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffff88802fd22000 RCX: ffff8880144ab900 RDX: 0000000000000000 RSI: ffff8880144ab900 RDI: 0000000000000002 RBP: ffffc90001fafd28 R08: ffffffff81e43cce R09: 0000000000000000 R10: 0000000000000007 R11: ffffed1005fa44c0 R12: fffffffffffffffc R13: 0000000000000005 R14: dffffc0000000000 R15: ffff88802fd22920 FS: 0000000000000000(0000) GS:ffff888063f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f3bcc12b000 CR3: 000000000b68e000 CR4: 0000000000350ee0 Call Trace: process_one_work+0x9df/0x16d0 kernel/workqueue.c:2297 worker_thread+0x90/0xed0 kernel/workqueue.c:2444 kthread+0x3e5/0x4d0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Kernel panic - not syncing: panic_on_warn set ... CPU: 2 PID: 16505 Comm: kworker/u9:6 Not tainted 5.15.0-rc6 #4 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1.1 04/01/2014 Workqueue: events_unbound io_ring_exit_work Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 panic+0x2b0/0x6dd kernel/panic.c:232 __warn.cold+0x20/0x2f kernel/panic.c:603 report_bug+0x273/0x300 lib/bug.c:199 handle_bug+0x3c/0x60 arch/x86/kernel/traps.c:239 exc_invalid_op+0x14/0x40 arch/x86/kernel/traps.c:259 asm_exc_invalid_op+0x12/0x20 arch/x86/include/asm/idtentry.h:566 RIP: 0010:io_ring_exit_work+0x23e/0x1550 fs/io_uring.c:9413 Code: 00 0f 85 67 0f 00 00 48 8b 05 ce b4 7c 09 31 ff 4c 8b 64 24 40 49 29 c4 4c 89 e6 e8 7c 23 92 ff 4d 85 e4 79 0d e8 f2 21 92 ff <0f> 0b 41 bd 70 17 00 00 e8 e5 21 92 ff 4c 89 ee 4c 89 ff e8 6a 42 RSP: 0018:ffffc90001fafbb0 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffff88802fd22000 RCX: ffff8880144ab900 RDX: 0000000000000000 RSI: ffff8880144ab900 RDI: 0000000000000002 RBP: ffffc90001fafd28 R08: ffffffff81e43cce R09: 0000000000000000 R10: 0000000000000007 R11: ffffed1005fa44c0 R12: fffffffffffffffc R13: 0000000000000005 R14: dffffc0000000000 R15: ffff88802fd22920 process_one_work+0x9df/0x16d0 kernel/workqueue.c:2297 worker_thread+0x90/0xed0 kernel/workqueue.c:2444 kthread+0x3e5/0x4d0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Dumping ftrace buffer: (ftrace buffer empty) Kernel Offset: disabled Rebooting in 1 seconds..
