Good day, dear maintainers, We found a bug using a modified kernel configuration file used by syzbot. We enhanced the coverage of the configuration file using our tool, klocalizer. Kernel Branch: 6.3.0-next-20230426 Kernel Config: https://drive.google.com/file/d/1KvqI7fZne2h3Kd3DpmOLyPGpSEdUBc2E/view?usp=sharing Reproducer: https://drive.google.com/file/d/1jzcFNmZ3cprWLTyPYdUhI6rXHT4DuP-3/view?usp=sharing Thank you! Best regards, Sanan Hasanov cont=00000000cd5131b6 current_req=0000000000000000 command_status=-1 floppy0: floppy timeout called floppy0: floppy_shutdown: timeout handler died. 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: 24572 Comm: kworker/u16:64 Not tainted 6.3.0-next-20230426 #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014 Workqueue: floppy floppy_work_workfn RIP: 0010:reset_interrupt+0xf7/0x230 drivers/block/floppy.c:1792 Code: fc 84 db 0f 85 83 00 00 00 e8 45 9a cc fc 48 8b 1d ae 3c fa 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 0f 85 f9 00 00 00 48 8b 43 08 5b ff e0 e8 13 9a cc fc RSP: 0018:ffffc9000883fd10 EFLAGS: 00010212 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000001 RSI: ffffffff84b4edeb RDI: 0000000000000008 RBP: ffffffff8c927000 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000400 R13: ffffc9000883fdb0 R14: ffff88810ef3f800 R15: ffff888100089000 FS: 0000000000000000(0000) GS:ffff888119c80000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fb088bbc000 CR3: 000000010d7fe000 CR4: 0000000000350ee0 Call Trace: <TASK> process_one_work+0x993/0x15e0 kernel/workqueue.c:2405 worker_thread+0x67d/0x10c0 kernel/workqueue.c:2552 kthread+0x33e/0x440 kernel/kthread.c:379 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:reset_interrupt+0xf7/0x230 drivers/block/floppy.c:1792 Code: fc 84 db 0f 85 83 00 00 00 e8 45 9a cc fc 48 8b 1d ae 3c fa 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 0f 85 f9 00 00 00 48 8b 43 08 5b ff e0 e8 13 9a cc fc RSP: 0018:ffffc9000883fd10 EFLAGS: 00010212 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000001 RSI: ffffffff84b4edeb RDI: 0000000000000008 RBP: ffffffff8c927000 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000400 R13: ffffc9000883fdb0 R14: ffff88810ef3f800 R15: ffff888100089000 FS: 0000000000000000(0000) GS:ffff888119c80000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fb088bbc000 CR3: 000000010d7fe000 CR4: 0000000000350ee0 ---------------- Code disassembly (best guess): 0: fc cld 1: 84 db test %bl,%bl 3: 0f 85 83 00 00 00 jne 0x8c 9: e8 45 9a cc fc call 0xfccc9a53 e: 48 8b 1d ae 3c fa 0b mov 0xbfa3cae(%rip),%rbx # 0xbfa3cc3 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: 0f 85 f9 00 00 00 jne 0x12d 34: 48 8b 43 08 mov 0x8(%rbx),%rax 38: 5b pop %rbx 39: ff e0 jmp *%rax 3b: e8 13 9a cc fc call 0xfccc9a53
