------------[ cut here ]------------ WARNING: CPU: 2 PID: 24421 at drivers/block/floppy.c:1000 schedule_bh+0x5f/0x70 drivers/block/floppy.c:1000 Modules linked in: CPU: 2 PID: 24421 Comm: syz-executor.0 Not tainted 5.16.0-rc1-syzkaller #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014 RIP: 0010:schedule_bh+0x5f/0x70 drivers/block/floppy.c:1000 Code: 77 08 ef fc 48 89 2d f0 ef f2 0b 5b 48 c7 c2 c0 94 6a 8c 48 8b 35 c1 f4 f2 0b bf 08 00 00 00 5d e9 56 8b c3 fc e8 51 08 ef fc <0f> 0b eb d1 66 66 2e 0f 1f 84 00 00 00 00 00 66 90 e8 3b 08 ef fc RSP: 0018:ffffc90000780dd0 EFLAGS: 00010046 RAX: 0000000080010001 RBX: 0000000000000001 RCX: 0000000000000000 RDX: ffff8880226a8080 RSI: ffffffff8488190f RDI: 0000000000000003 RBP: ffffffff84880dd0 R08: 0000000000000000 R09: ffffffff8c6a94c7 R10: ffffffff848818df R11: 0000000000000000 R12: 0000000000000001 R13: ffffffff84880dd0 R14: 0000000000000000 R15: ffff888010de5000 FS: 00007f712ca7b700(0000) GS:ffff88802cc00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2d146000 CR3: 0000000057d45000 CR4: 0000000000150ee0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: floppy_interrupt+0x228/0x340 drivers/block/floppy.c:1766 floppy_hardint+0x1a7/0x200 arch/x86/include/asm/floppy.h:66 __handle_irq_event_percpu+0x303/0x8f0 kernel/irq/handle.c:158 handle_irq_event_percpu kernel/irq/handle.c:198 [inline] handle_irq_event+0x102/0x280 kernel/irq/handle.c:215 handle_edge_irq+0x25f/0xd00 kernel/irq/chip.c:822 generic_handle_irq_desc include/linux/irqdesc.h:158 [inline] handle_irq arch/x86/kernel/irq.c:231 [inline] __common_interrupt+0x9d/0x210 arch/x86/kernel/irq.c:250 common_interrupt+0xa4/0xc0 arch/x86/kernel/irq.c:240 asm_common_interrupt+0x1e/0x40 arch/x86/include/asm/idtentry.h:629 RIP: 0010:start_this_handle+0xe58/0x1380 fs/jbd2/transaction.c:456 Code: 24 48 8d 78 30 4c 89 20 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 0f b6 04 02 84 c0 74 09 3c 03 7f 05 e8 78 8e 99 ff <48> 8b 04 24 8b 4c 24 40 48 8d 78 14 48 89 fa 89 48 30 48 b8 00 00 RSP: 0018:ffffc90002fbef48 EFLAGS: 00000246 RAX: 0000000000000000 RBX: ffff888042b08000 RCX: ffffc9000cde1000 RDX: 1ffff11004a7c495 RSI: ffffffff8223c19f RDI: ffff8880253e24a8 RBP: ffff888042b080c0 R08: 0000000000000000 R09: ffff888042b08767 R10: ffffffff8223b73a R11: 0000000000000000 R12: ffff8880253cab40 R13: 0000000000000000 R14: ffff888042b080c0 R15: dffffc0000000000 jbd2__journal_start+0x399/0x930 fs/jbd2/transaction.c:525 __ext4_journal_start_sb+0x227/0x4a0 fs/ext4/ext4_jbd2.c:105 __ext4_journal_start fs/ext4/ext4_jbd2.h:326 [inline] ext4_writepages+0x120d/0x3b90 fs/ext4/inode.c:2778 do_writepages+0x1ab/0x690 mm/page-writeback.c:2364 filemap_fdatawrite_wbc mm/filemap.c:407 [inline] filemap_fdatawrite_wbc+0x143/0x1b0 mm/filemap.c:397 __filemap_fdatawrite_range mm/filemap.c:440 [inline] filemap_write_and_wait_range mm/filemap.c:718 [inline] filemap_write_and_wait_range+0xe1/0x1a0 mm/filemap.c:712 __iomap_dio_rw+0x5d4/0x1a10 fs/iomap/direct-io.c:560 iomap_dio_rw+0x38/0x90 fs/iomap/direct-io.c:679 ext4_dio_read_iter fs/ext4/file.c:77 [inline] ext4_file_read_iter+0x41c/0x5d0 fs/ext4/file.c:128 call_read_iter include/linux/fs.h:2156 [inline] generic_file_splice_read+0x453/0x6d0 fs/splice.c:311 do_splice_to+0x1bf/0x250 fs/splice.c:796 splice_direct_to_actor+0x2c2/0x8c0 fs/splice.c:870 do_splice_direct+0x1b3/0x280 fs/splice.c:979 do_sendfile+0xaf2/0x1250 fs/read_write.c:1245 __do_sys_sendfile64 fs/read_write.c:1310 [inline] __se_sys_sendfile64 fs/read_write.c:1296 [inline] __x64_sys_sendfile64+0x1cc/0x210 fs/read_write.c:1296 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f712f526ae9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f712ca7b188 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 00007f712f63a020 RCX: 00007f712f526ae9 RDX: 0000000000000000 RSI: 0000000000000006 RDI: 0000000000000007 RBP: 00007f712f580f6d R08: 0000000000000000 R09: 0000000000000000 R10: 000000010000a006 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffdc22886cf R14: 00007f712ca7b300 R15: 0000000000022000 ---------------- Code disassembly (best guess): 0: 24 48 and $0x48,%al 2: 8d 78 30 lea 0x30(%rax),%edi 5: 4c 89 20 mov %r12,(%rax) 8: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax f: fc ff df 12: 48 89 fa mov %rdi,%rdx 15: 48 c1 ea 03 shr $0x3,%rdx 19: 0f b6 04 02 movzbl (%rdx,%rax,1),%eax 1d: 84 c0 test %al,%al 1f: 74 09 je 0x2a 21: 3c 03 cmp $0x3,%al 23: 7f 05 jg 0x2a 25: e8 78 8e 99 ff callq 0xff998ea2 * 2a: 48 8b 04 24 mov (%rsp),%rax <-- trapping instruction 2e: 8b 4c 24 40 mov 0x40(%rsp),%ecx 32: 48 8d 78 14 lea 0x14(%rax),%rdi 36: 48 89 fa mov %rdi,%rdx 39: 89 48 30 mov %ecx,0x30(%rax) 3c: 48 rex.W 3d: b8 .byte 0xb8