Hello, syzbot found the following issue on: HEAD commit: 3e7bb4f24617 Merge tag '6.3-rc6-smb311-client-negcontext-f.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1304980bc80000 kernel config: https://syzkaller.appspot.com/x/.config?x=c21559e740385326 dashboard link: https://syzkaller.appspot.com/bug?extid=aa45f3927a085bc1b242 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+aa45f3927a085bc1b242@xxxxxxxxxxxxxxxxxxxxxxxxx ------------[ cut here ]------------ WARNING: CPU: 3 PID: 21618 at drivers/block/floppy.c:999 schedule_bh drivers/block/floppy.c:999 [inline] WARNING: CPU: 3 PID: 21618 at drivers/block/floppy.c:999 floppy_interrupt+0x3cc/0x440 drivers/block/floppy.c:1765 Modules linked in: CPU: 3 PID: 21618 Comm: kworker/u16:7 Not tainted 6.3.0-rc6-syzkaller-00188-g3e7bb4f24617 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014 Workqueue: floppy floppy_work_workfn RIP: 0010:schedule_bh drivers/block/floppy.c:999 [inline] RIP: 0010:floppy_interrupt+0x3cc/0x440 drivers/block/floppy.c:1765 Code: 03 cf 8a 89 c6 89 05 63 fa eb 0c e8 7e 27 ff ff 8b 1d 58 fa eb 0c e9 9c fd ff ff e8 8e 5f b7 fc e9 66 fd ff ff e8 24 4d 66 fc <0f> 0b e9 c9 fe ff ff 48 c7 c7 00 f2 40 8c e8 31 5f b7 fc e9 5a fc RSP: 0018:ffffc900005d8e58 EFLAGS: 00010046 RAX: 0000000080010000 RBX: 0000000000000001 RCX: 0000000000000000 RDX: ffff88801d1b1d40 RSI: ffffffff851c9e3c RDI: 0000000000000001 RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: ffffffff851c17e0 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000006 FS: 0000000000000000(0000) GS:ffff88802c900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fc8f5102dd0 CR3: 000000002655a000 CR4: 0000000000150ee0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <IRQ> floppy_hardint+0x1b1/0x200 arch/x86/include/asm/floppy.h:66 __handle_irq_event_percpu+0x22b/0x730 kernel/irq/handle.c:158 handle_irq_event_percpu kernel/irq/handle.c:193 [inline] handle_irq_event+0xab/0x1e0 kernel/irq/handle.c:210 handle_edge_irq+0x263/0xd00 kernel/irq/chip.c:819 generic_handle_irq_desc include/linux/irqdesc.h:158 [inline] handle_irq arch/x86/kernel/irq.c:231 [inline] __common_interrupt+0xa1/0x220 arch/x86/kernel/irq.c:250 common_interrupt+0xa8/0xd0 arch/x86/kernel/irq.c:240 </IRQ> <TASK> asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:636 RIP: 0010:outb_p arch/x86/include/asm/io.h:296 [inline] RIP: 0010:fdc_outb drivers/block/floppy.c:602 [inline] RIP: 0010:reset_fdc+0x185/0x400 drivers/block/floppy.c:1817 Code: ba 00 00 00 00 00 fc ff df 48 89 f9 48 c1 e9 03 80 3c 11 00 0f 85 8a 01 00 00 48 8d 14 9b 48 8b 14 d5 70 6f 08 92 83 c2 04 ee <e8> 56 ec ff ff 48 83 c4 08 5b 5d e9 ab 05 67 fc e8 a6 05 67 fc 48 RSP: 0018:ffffc9000f2c7c20 EFLAGS: 00000202 RAX: 00000000ffffff83 RBX: 0000000000000000 RCX: 1ffffffff2410dee RDX: 00000000000003f4 RSI: ffffffff851be51c RDI: ffffffff92086f70 RBP: 0000000000000062 R08: 0000000000000001 R09: 0000000000000044 R10: 0000000000000062 R11: 0000000000000000 R12: ffffffff851ca2e0 R13: 0000000000000001 R14: ffff888049043c00 R15: ffff888012489000 fd_wait_for_completion+0xd2/0x170 drivers/block/floppy.c:1051 redo_fd_request+0x1f0/0x3010 drivers/block/floppy.c:2799 process_one_work+0x991/0x15c0 kernel/workqueue.c:2390 worker_thread+0x669/0x1090 kernel/workqueue.c:2537 kthread+0x2e8/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 </TASK> ---------------- Code disassembly (best guess): 0: ba 00 00 00 00 mov $0x0,%edx 5: 00 fc add %bh,%ah 7: ff (bad) 8: df 48 89 fisttps -0x77(%rax) b: f9 stc c: 48 c1 e9 03 shr $0x3,%rcx 10: 80 3c 11 00 cmpb $0x0,(%rcx,%rdx,1) 14: 0f 85 8a 01 00 00 jne 0x1a4 1a: 48 8d 14 9b lea (%rbx,%rbx,4),%rdx 1e: 48 8b 14 d5 70 6f 08 mov -0x6df79090(,%rdx,8),%rdx 25: 92 26: 83 c2 04 add $0x4,%edx 29: ee out %al,(%dx) * 2a: e8 56 ec ff ff callq 0xffffec85 <-- trapping instruction 2f: 48 83 c4 08 add $0x8,%rsp 33: 5b pop %rbx 34: 5d pop %rbp 35: e9 ab 05 67 fc jmpq 0xfc6705e5 3a: e8 a6 05 67 fc callq 0xfc6705e5 3f: 48 rex.W --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
