floppy1: disk change line=0
floppy1: flags=20
setup_rw_floppy:rw_command dtime=17
general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 1 PID: 9 Comm: kworker/u16:0 Not tainted 5.17.0-rc7-syzkaller-00235-gaad611a868d1 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014
Workqueue: floppy floppy_work_workfn
RIP: 0010:start_motor+0x3a/0x3f0 drivers/block/floppy.c:1906
Code: 08 e8 2a fc fb fc 48 8b 1d d3 43 04 0c 48 b8 00 00 00 00 00 fc ff df 0f b6 2d e2 2d 04 0c 48 89 da 48 c1 ea 03 89 e9 41 89 ed <0f> b6 04 02 83 e1 03 41 83 e5 03 84 c0 74 08 3c 03 0f 8e be 02 00
RSP: 0018:ffffc900005cfca8 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000001
RDX: 0000000000000000 RSI: ffffffff847bf966 RDI: ffffffff847c0d60
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffff847c0dca R11: 0000000000000000 R12: ffffffff847c0d60
R13: 0000000000000001 R14: ffff888011850700 R15: ffff888010c75800
FS: 0000000000000000(0000) GS:ffff88802cb00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c00027d0a0 CR3: 000000004f98c000 CR4: 0000000000150ee0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
floppy_ready+0x83/0x1850 drivers/block/floppy.c:1933
process_one_work+0x9ac/0x1650 kernel/workqueue.c:2307
worker_thread+0x657/0x1110 kernel/workqueue.c:2454
kthread+0x2e9/0x3a0 kernel/kthread.c:377
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:start_motor+0x3a/0x3f0 drivers/block/floppy.c:1906
Code: 08 e8 2a fc fb fc 48 8b 1d d3 43 04 0c 48 b8 00 00 00 00 00 fc ff df 0f b6 2d e2 2d 04 0c 48 89 da 48 c1 ea 03 89 e9 41 89 ed <0f> b6 04 02 83 e1 03 41 83 e5 03 84 c0 74 08 3c 03 0f 8e be 02 00
RSP: 0018:ffffc900005cfca8 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000001
RDX: 0000000000000000 RSI: ffffffff847bf966 RDI: ffffffff847c0d60
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffff847c0dca R11: 0000000000000000 R12: ffffffff847c0d60
R13: 0000000000000001 R14: ffff888011850700 R15: ffff888010c75800
FS: 0000000000000000(0000) GS:ffff88802ca00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8f6e145300 CR3: 000000000b88e000 CR4: 0000000000150ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: 08 e8 or %ch,%al
2: 2a fc sub %ah,%bh
4: fb sti
5: fc cld
6: 48 8b 1d d3 43 04 0c mov 0xc0443d3(%rip),%rbx # 0xc0443e0
d: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
14: fc ff df
17: 0f b6 2d e2 2d 04 0c movzbl 0xc042de2(%rip),%ebp # 0xc042e00
1e: 48 89 da mov %rbx,%rdx
21: 48 c1 ea 03 shr $0x3,%rdx
25: 89 e9 mov %ebp,%ecx
27: 41 89 ed mov %ebp,%r13d
* 2a: 0f b6 04 02 movzbl (%rdx,%rax,1),%eax <-- trapping instruction
2e: 83 e1 03 and $0x3,%ecx
31: 41 83 e5 03 and $0x3,%r13d
35: 84 c0 test %al,%al
37: 74 08 je 0x41
39: 3c 03 cmp $0x3,%al
3b: 0f .byte 0xf
3c: 8e .byte 0x8e
3d: be .byte 0xbe
3e: 02 00 add (%rax),%al