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/1bzxncErwj8l-KA-R-jLCUajYQMReiAWX/view?usp=sharing kernel config: https://drive.google.com/file/d/12PUnxIM1EPBgW4ZJmI7WJBRaY1lA83an/view?usp=sharing Syzlang reproducer: https://drive.google.com/file/d/1IOQR_MqiSkN8y0m3UjFZcP9l5QcBnCIv/view?usp=sharing Sorry, I don't have a C reproducer for this crash, hope the Syzlang reproducer and symbolized report can help. If you fix this issue, please add the following tag to the commit: Reported-by: Hao Sun <sunhao.th@xxxxxxxxx> floppy0: Unable to send byte 6f to FDC. Fdc=0 Status=d0 floppy driver state ------------------- now=4295008404 last interrupt=4295008403 diff=1 last called handler=reset_interrupt timeout_message=floppy start last output bytes: 10 90 4294978780 7 80 4294978780 0 90 4294978780 8 80 4294978780 f 80 4294978780 0 90 4294978780 1 90 4294978780 8 80 4294978780 4 80 4294978785 0 90 4294978785 f 80 4294978785 0 90 4294978785 8 80 4294978785 0 90 4294978785 d8 80 4295008402 8 80 4295008403 8 80 4295008403 8 80 4295008403 8 80 4295008403 d8 80 4295008404 last result at 4295008403 last redo_fd_request at 4295008403 status=d0 fdc_busy=1 floppy_work.func=floppy_work_workfn timer_function=ffffffff8476f5f0 expires=298 cont=ffffffff89fe0d80 current_req=0000000000000000 command_status=-1 general protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f] CPU: 1 PID: 10 Comm: kworker/u8:1 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: floppy floppy_work_workfn RIP: 0010:reset_interrupt+0xef/0x140 drivers/block/floppy.c:1792 Code: fc 84 db 0f 85 71 58 8e 04 e8 4d 4d ff fc 48 8b 1d 86 47 db 0b 48 b8 00 00 00 00 00 fc ff df 48 8d 7b 08 48 89 fa 48 c1 ea 03 <80> 3c 02 00 75 40 48 8b 43 08 5b ff e0 e8 0f dd 46 fd eb a8 e8 08 RSP: 0018:ffffc900006d7d28 EFLAGS: 00010212 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffff8880118d9c80 RDX: 0000000000000001 RSI: ffff8880118d9c80 RDI: 0000000000000008 RBP: ffffffff8c482f00 R08: ffffffff84771173 R09: 0000000000000000 R10: 0000000000000001 R11: fffffbfff1adb1ba R12: ffffc900006d7dc8 R13: ffffffff8c482f10 R14: ffff888011968000 R15: ffff888010c71800 FS: 0000000000000000(0000) GS:ffff888135c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f3397e36db8 CR3: 0000000020a83000 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 Modules linked in: Dumping ftrace buffer: (ftrace buffer empty) ---[ end trace 24ebcf9665bb7032 ]--- RIP: 0010:reset_interrupt+0xef/0x140 drivers/block/floppy.c:1792 Code: fc 84 db 0f 85 71 58 8e 04 e8 4d 4d ff fc 48 8b 1d 86 47 db 0b 48 b8 00 00 00 00 00 fc ff df 48 8d 7b 08 48 89 fa 48 c1 ea 03 <80> 3c 02 00 75 40 48 8b 43 08 5b ff e0 e8 0f dd 46 fd eb a8 e8 08 RSP: 0018:ffffc900006d7d28 EFLAGS: 00010212 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffff8880118d9c80 RDX: 0000000000000001 RSI: ffff8880118d9c80 RDI: 0000000000000008 RBP: ffffffff8c482f00 R08: ffffffff84771173 R09: 0000000000000000 R10: 0000000000000001 R11: fffffbfff1adb1ba R12: ffffc900006d7dc8 R13: ffffffff8c482f10 R14: ffff888011968000 R15: ffff888010c71800 FS: 0000000000000000(0000) GS:ffff888063f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000100000000 CR3: 00000000277d1000 CR4: 0000000000350ee0 ---------------- Code disassembly (best guess): 0: fc cld 1: 84 db test %bl,%bl 3: 0f 85 71 58 8e 04 jne 0x48e587a 9: e8 4d 4d ff fc callq 0xfcff4d5b e: 48 8b 1d 86 47 db 0b mov 0xbdb4786(%rip),%rbx # 0xbdb479b 15: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 1c: fc ff df 1f: 48 8d 7b 08 lea 0x8(%rbx),%rdi 23: 48 89 fa mov %rdi,%rdx 26: 48 c1 ea 03 shr $0x3,%rdx * 2a: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) <-- trapping instruction 2e: 75 40 jne 0x70 30: 48 8b 43 08 mov 0x8(%rbx),%rax 34: 5b pop %rbx 35: ff e0 jmpq *%rax 37: e8 0f dd 46 fd callq 0xfd46dd4b 3c: eb a8 jmp 0xffffffe6 3e: e8 .byte 0xe8 3f: 08 .byte 0x8
