syzbot has found a reproducer for the following issue on: HEAD commit: babf0bb978e3 Merge tag 'xfs-5.19-for-linus' of git://git.k.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1256f1d3f00000 kernel config: https://syzkaller.appspot.com/x/.config?x=fb7a468cb4ea251 dashboard link: https://syzkaller.appspot.com/bug?extid=bac6723617710898abd3 compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 userspace arch: i386 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1107de15f00000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1104a36df00000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+bac6723617710898abd3@xxxxxxxxxxxxxxxxxxxxxxxxx ------------[ cut here ]------------ WARNING: CPU: 1 PID: 3673 at drivers/block/floppy.c:999 schedule_bh drivers/block/floppy.c:999 [inline] WARNING: CPU: 1 PID: 3673 at drivers/block/floppy.c:999 process_fd_request drivers/block/floppy.c:2847 [inline] WARNING: CPU: 1 PID: 3673 at drivers/block/floppy.c:999 __floppy_read_block_0.isra.0+0x292/0x330 drivers/block/floppy.c:4160 Modules linked in: CPU: 1 PID: 3673 Comm: syz-executor234 Not tainted 5.18.0-syzkaller-07857-gbabf0bb978e3 #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:999 [inline] RIP: 0010:process_fd_request drivers/block/floppy.c:2847 [inline] RIP: 0010:__floppy_read_block_0.isra.0+0x292/0x330 drivers/block/floppy.c:4160 Code: 84 24 b8 01 00 00 65 48 2b 04 25 28 00 00 00 0f 85 a0 00 00 00 48 81 c4 c0 01 00 00 5b 5d 41 5c 41 5d 41 5e c3 e8 9e 76 e1 fc <0f> 0b e9 5a ff ff ff e8 62 bc 2d fd e9 7c fe ff ff e8 88 76 e1 fc RSP: 0018:ffffc90002b3f6a0 EFLAGS: 00010293 RAX: 0000000000000000 RBX: 1ffff92000567ed4 RCX: 0000000000000000 RDX: ffff888015c3bb00 RSI: ffffffff849851d2 RDI: 0000000000000003 RBP: ffffea000068d3c0 R08: 0000000000000000 R09: ffffffff8c8e8b47 R10: ffffffff8498512a R11: 0000000000000000 R12: 0000000000000001 R13: 0000000000000001 R14: dffffc0000000000 R15: 0000000000000001 FS: 0000000000000000(0000) GS:ffff88802cb00000(0063) knlGS:00000000570f32c0 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 00000000f7f88ca8 CR3: 0000000018139000 CR4: 0000000000150ee0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> floppy_revalidate.isra.0+0x801/0xae0 drivers/block/floppy.c:4206 floppy_open+0xac5/0xd70 drivers/block/floppy.c:4058 blkdev_get_whole+0x99/0x2d0 block/bdev.c:673 blkdev_get_by_dev.part.0+0x5ec/0xb90 block/bdev.c:823 blkdev_get_by_dev+0x6b/0x80 block/bdev.c:857 blkdev_open+0x13c/0x2c0 block/fops.c:481 do_dentry_open+0x4a1/0x11e0 fs/open.c:824 do_open fs/namei.c:3477 [inline] path_openat+0x1c71/0x2910 fs/namei.c:3610 do_filp_open+0x1aa/0x400 fs/namei.c:3637 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+0x53/0x62 RIP: 0023:0xf7f15549 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:00000000ffb136c0 EFLAGS: 00000246 ORIG_RAX: 0000000000000127 RAX: ffffffffffffffda RBX: 00000000ffffff9c RCX: 00000000ffb13710 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000f7fbe000 RBP: 0000000066666667 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 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
