syzbot


WARNING in user_reset_fdc

Status: auto-obsoleted due to no activity on 2023/11/26 02:44
Subsystems: block
[Documentation on labels]
Reported-by: syzbot+233dd451466273c18ef0@syzkaller.appspotmail.com
First crash: 574d, last: 574d
Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [block?] WARNING in user_reset_fdc 0 (1) 2023/08/18 16:15

Sample crash report:
------------[ cut here ]------------
WARNING: CPU: 2 PID: 26006 at drivers/block/floppy.c:999 schedule_bh drivers/block/floppy.c:999 [inline]
WARNING: CPU: 2 PID: 26006 at drivers/block/floppy.c:999 process_fd_request drivers/block/floppy.c:2847 [inline]
WARNING: CPU: 2 PID: 26006 at drivers/block/floppy.c:999 user_reset_fdc+0x1a1/0x1e0 drivers/block/floppy.c:2945
Modules linked in:
CPU: 2 PID: 26006 Comm: syz-executor.3 Not tainted 6.5.0-rc6-syzkaller-00038-g16931859a650 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:schedule_bh drivers/block/floppy.c:999 [inline]
RIP: 0010:process_fd_request drivers/block/floppy.c:2847 [inline]
RIP: 0010:user_reset_fdc+0x1a1/0x1e0 drivers/block/floppy.c:2945
Code: fc ff df 48 89 fa 48 c1 ea 03 0f b6 04 02 84 c0 74 02 7e 27 48 8d 04 9b 80 0c c5 38 37 42 92 04 e9 b4 fe ff ff e8 bf e8 4f fc <0f> 0b e9 3d ff ff ff e8 93 f5 a3 fc e9 d8 fe ff ff e8 29 f6 a3 fc
RSP: 0018:ffffc900283af978 EFLAGS: 00010293
RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000000000000000
RDX: ffff88801ccec800 RSI: ffffffff85361fe1 RDI: 0000000000000001
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000002
R13: 0000000000000001 R14: 0000000000000012 R15: 0000000000000012
FS:  0000000000000000(0000) GS:ffff88802c800000(0063) knlGS:00000000f7fb4b40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 00000000f731c268 CR3: 0000000069b30000 CR4: 0000000000350ee0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 fd_locked_ioctl+0xa78/0x1a10 drivers/block/floppy.c:3542
 fd_ioctl drivers/block/floppy.c:3576 [inline]
 fd_compat_ioctl+0x90b/0x1d00 drivers/block/floppy.c:3890
 compat_blkdev_ioctl+0x2fe/0x7c0 block/ioctl.c:677
 __do_compat_sys_ioctl+0x2bf/0x330 fs/ioctl.c:968
 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline]
 __do_fast_syscall_32+0x61/0xe0 arch/x86/entry/common.c:178
 do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:203
 entry_SYSENTER_compat_after_hwframe+0x70/0x82
RIP: 0023:0xf7fb9579
Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00
RSP: 002b:00000000f7fb45ac EFLAGS: 00000292 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000000254
RDX: 0000000000000002 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000292 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
----------------
Code disassembly (best guess), 2 bytes skipped:
   0:	10 06                	adc    %al,(%rsi)
   2:	03 74 b4 01          	add    0x1(%rsp,%rsi,4),%esi
   6:	10 07                	adc    %al,(%rdi)
   8:	03 74 b0 01          	add    0x1(%rax,%rsi,4),%esi
   c:	10 08                	adc    %cl,(%rax)
   e:	03 74 d8 01          	add    0x1(%rax,%rbx,8),%esi
  1e:	00 51 52             	add    %dl,0x52(%rcx)
  21:	55                   	push   %rbp
  22:	89 e5                	mov    %esp,%ebp
  24:	0f 34                	sysenter
  26:	cd 80                	int    $0x80
* 28:	5d                   	pop    %rbp <-- trapping instruction
  29:	5a                   	pop    %rdx
  2a:	59                   	pop    %rcx
  2b:	c3                   	ret
  2c:	90                   	nop
  2d:	90                   	nop
  2e:	90                   	nop
  2f:	90                   	nop
  30:	8d b4 26 00 00 00 00 	lea    0x0(%rsi,%riz,1),%esi
  37:	8d b4 26 00 00 00 00 	lea    0x0(%rsi,%riz,1),%esi

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/08/18 02:44 upstream 16931859a650 74b106b6 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in user_reset_fdc
* Struck through repros no longer work on HEAD.