general protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f] CPU: 0 PID: 22416 Comm: kworker/u16:2 Not tainted 6.5.0-rc2-syzkaller-00046-gccff6d117d8d #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 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 75 7d 50 fc 48 8b 1d fe 07 0c 0d 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 43 7d 50 fc RSP: 0018:ffffc90028937ce0 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000001 RSI: ffffffff8535f33b RDI: 0000000000000008 RBP: ffffc90028937d80 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff888065184178 R13: ffff888065184100 R14: ffff88801dbb0000 R15: ffffffff8d6e8000 FS: 0000000000000000(0000) GS:ffff88802c600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000f7f5eda4 CR3: 00000000269c8000 CR4: 0000000000350ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: process_one_work+0xaa2/0x16f0 kernel/workqueue.c:2597 worker_thread+0x687/0x1110 kernel/workqueue.c:2748 kthread+0x33a/0x430 kernel/kthread.c:389 ret_from_fork+0x2c/0x70 arch/x86/kernel/process.c:145 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:296 RIP: 0000:0x0 Code: Unable to access opcode bytes at 0xffffffffffffffd6. RSP: 0000:0000000000000000 EFLAGS: 00000000 ORIG_RAX: 0000000000000000 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 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 75 7d 50 fc 48 8b 1d fe 07 0c 0d 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 43 7d 50 fc RSP: 0018:ffffc90028937ce0 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000001 RSI: ffffffff8535f33b RDI: 0000000000000008 RBP: ffffc90028937d80 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff888065184178 R13: ffff888065184100 R14: ffff88801dbb0000 R15: ffffffff8d6e8000 FS: 0000000000000000(0000) GS:ffff88802c800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f7684a92440 CR3: 000000000c776000 CR4: 0000000000350ee0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: fc cld 1: 84 db test %bl,%bl 3: 0f 85 83 00 00 00 jne 0x8c 9: e8 75 7d 50 fc call 0xfc507d83 e: 48 8b 1d fe 07 0c 0d mov 0xd0c07fe(%rip),%rbx # 0xd0c0813 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 43 7d 50 fc call 0xfc507d83