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* [syzbot] WARNING in wait_til_done
@ 2022-04-25 19:52 syzbot
  2022-05-28 20:46 ` syzbot
  0 siblings, 1 reply; 2+ messages in thread
From: syzbot @ 2022-04-25 19:52 UTC (permalink / raw)
  To: axboe, efremov, linux-block, linux-kernel, syzkaller-bugs

Hello,

syzbot found the following issue on:

HEAD commit:    22da5264abf4 Merge tag '5.18-rc3-ksmbd-fixes' of git://git..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=123287c0f00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=71bf5c8488a4e33a
dashboard link: https://syzkaller.appspot.com/bug?extid=3562be49b8e09d424a6f
compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
userspace arch: i386

Unfortunately, I don't have any reproducer for this issue yet.

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+3562be49b8e09d424a6f@syzkaller.appspotmail.com

------------[ cut here ]------------
WARNING: CPU: 2 PID: 379 at drivers/block/floppy.c:1000 schedule_bh drivers/block/floppy.c:1000 [inline]
WARNING: CPU: 2 PID: 379 at drivers/block/floppy.c:1000 wait_til_done+0x350/0x3c0 drivers/block/floppy.c:2019
Modules linked in:
CPU: 2 PID: 379 Comm: syz-executor.0 Not tainted 5.18.0-rc3-syzkaller-00235-g22da5264abf4 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014
RIP: 0010:schedule_bh drivers/block/floppy.c:1000 [inline]
RIP: 0010:wait_til_done+0x350/0x3c0 drivers/block/floppy.c:2019
Code: fc 41 83 fd 01 7e ac e8 0e 56 e7 fc 4c 89 e6 48 c7 c7 20 c0 8c 8c e8 5f 9b c8 fc e8 fa 55 e7 fc e9 c3 fd ff ff e8 f0 55 e7 fc <0f> 0b e9 4b fd ff ff e8 b4 e6 32 fd e9 0f fe ff ff e8 da 55 e7 fc
RSP: 0018:ffffc900282676f8 EFLAGS: 00010212
RAX: 0000000000000987 RBX: 1ffff9200504cedf RCX: ffffc90003771000
RDX: 0000000000040000 RSI: ffffffff8491daa0 RDI: 0000000000000003
RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff8c8cbd87
R10: ffffffff8491d7e9 R11: 0000000000000000 R12: 0000000000000001
R13: ffffffff8491aab0 R14: 0000000000000000 R15: 0000000000000003
FS:  0000000000000000(0000) GS:ffff88802cc00000(0063) knlGS:00000000f7f92b40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 0000000030e22000 CR3: 0000000019451000 CR4: 0000000000150ee0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 floppy_check_events+0x3d0/0x560 drivers/block/floppy.c:4079
 disk_check_events+0xc2/0x420 block/disk-events.c:193
 disk_clear_events block/disk-events.c:248 [inline]
 bdev_check_media_change+0x12c/0x310 block/disk-events.c:279
 floppy_open+0x75d/0xd70 drivers/block/floppy.c:4038
 blkdev_get_whole+0x99/0x2d0 block/bdev.c:666
 blkdev_get_by_dev.part.0+0x5d2/0xc80 block/bdev.c:816
 blkdev_get_by_dev+0x6b/0x80 block/bdev.c:850
 blkdev_open+0x13c/0x2c0 block/fops.c:498
 do_dentry_open+0x4a1/0x11e0 fs/open.c:824
 do_open fs/namei.c:3476 [inline]
 path_openat+0x1c71/0x2910 fs/namei.c:3609
 do_filp_open+0x1aa/0x400 fs/namei.c:3636
 do_sys_openat2+0x16d/0x4c0 fs/open.c:1213
 do_sys_open fs/open.c:1229 [inline]
 __do_compat_sys_openat fs/open.c:1289 [inline]
 __se_compat_sys_openat fs/open.c:1287 [inline]
 __ia32_compat_sys_openat+0x13f/0x1f0 fs/open.c:1287
 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline]
 __do_fast_syscall_32+0x65/0xf0 arch/x86/entry/common.c:178
 do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:203
 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c
RIP: 0023:0xf7f97549
Code: 03 74 c0 01 10 05 03 74 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 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:00000000f7f92170 EFLAGS: 00000286 ORIG_RAX: 0000000000000127
RAX: ffffffffffffffda RBX: 00000000ffffff9c RCX: 00000000f7f921c0
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000f6f36000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
----------------
Code disassembly (best guess):
   0:	03 74 c0 01          	add    0x1(%rax,%rax,8),%esi
   4:	10 05 03 74 b8 01    	adc    %al,0x1b87403(%rip)        # 0x1b8740d
   a:	10 06                	adc    %al,(%rsi)
   c:	03 74 b4 01          	add    0x1(%rsp,%rsi,4),%esi
  10:	10 07                	adc    %al,(%rdi)
  12:	03 74 b0 01          	add    0x1(%rax,%rsi,4),%esi
  16:	10 08                	adc    %cl,(%rax)
  18:	03 74 d8 01          	add    0x1(%rax,%rbx,8),%esi
  1c:	00 00                	add    %al,(%rax)
  1e:	00 00                	add    %al,(%rax)
  20:	00 51 52             	add    %dl,0x52(%rcx)
  23:	55                   	push   %rbp
  24:	89 e5                	mov    %esp,%ebp
  26:	0f 34                	sysenter
  28:	cd 80                	int    $0x80
* 2a:	5d                   	pop    %rbp <-- trapping instruction
  2b:	5a                   	pop    %rdx
  2c:	59                   	pop    %rcx
  2d:	c3                   	retq
  2e:	90                   	nop
  2f:	90                   	nop
  30:	90                   	nop
  31:	90                   	nop
  32:	8d b4 26 00 00 00 00 	lea    0x0(%rsi,%riz,1),%esi
  39:	8d b4 26 00 00 00 00 	lea    0x0(%rsi,%riz,1),%esi


---
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