Unknown ioctl 1086083857
Unknown ioctl 1086083857
BUG: unable to handle kernel NULL pointer dereference at 00000000000000f0
PGD 80000001005dc067 P4D 80000001005dc067 PUD 10c3dd067 PMD 0 
Oops: 0000 [#1] SMP PTI
CPU: 1 PID: 18665 Comm: syz-executor4 Not tainted 4.18.0-rc4+ #27
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:is_loop_device drivers/block/loop.c:653 [inline]
RIP: 0010:loop_validate_file drivers/block/loop.c:664 [inline]
RIP: 0010:loop_change_fd drivers/block/loop.c:710 [inline]
RIP: 0010:lo_ioctl+0x24c8/0x4e00 drivers/block/loop.c:1414
Code: 85 18 01 00 00 49 8b 1c 24 b8 f0 00 00 00 48 01 c3 4c 89 e7 e8 c9 f3 89 fb 48 83 38 00 4c 8b ad 10 fe ff ff 0f 85 00 01 00 00 <4c> 8b 33 48 89 df e8 ad f3 89 fb 48 83 38 00 0f 85 f7 00 00 00 4d 
RSP: 0018:ffff88010473f858 EFLAGS: 00010246
RAX: ffff88019619f2f0 RBX: 00000000000000f0 RCX: ffff8801b611f2f0
RDX: ffff8801b611f2f0 RSI: aaaaaaaaaaaab000 RDI: ffffea000a4ecda0
RBP: ffff88010473faf0 R08: 0000000000480020 R09: 0000000000000002
R10: 0000000000000000 R11: ffffffff8639b750 R12: ffff8801b7ccf2f0
R13: ffff8801cbfede00 R14: 0000000000000000 R15: 0000000000000000
print_req_error: I/O error, dev loop0, sector 0
FS:  00007f21e0edc700(0000) GS:ffff88021fd00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000000000f0 CR3: 0000000102744000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
print_req_error: I/O error, dev loop0, sector 5504
buffer_io_error: 136 callbacks suppressed
Buffer I/O error on dev loop0, logical block 688, lost async page write
 __blkdev_driver_ioctl block/ioctl.c:303 [inline]
 blkdev_ioctl+0x22b1/0x4fb0 block/ioctl.c:601
print_req_error: I/O error, dev loop0, sector 0
 block_ioctl+0x16f/0x1d0 fs/block_dev.c:1880
 vfs_ioctl fs/ioctl.c:46 [inline]
 do_vfs_ioctl+0xdef/0x2740 fs/ioctl.c:686
 ksys_ioctl fs/ioctl.c:701 [inline]
 __do_sys_ioctl fs/ioctl.c:708 [inline]
 __se_sys_ioctl fs/ioctl.c:706 [inline]
 __x64_sys_ioctl+0x280/0x320 fs/ioctl.c:706
 do_syscall_64+0x15b/0x230 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x63/0xe7
RIP: 0033:0x455ab9
Code: 1d ba fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 eb b9 fb ff c3 66 2e 0f 1f 84 00 00 00 00 
RSP: 002b:00007f21e0edbc68 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f21e0edc6d4 RCX: 0000000000455ab9
RDX: 0000000000000014 RSI: 0000000000004c06 RDI: 0000000000000013
RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000004bdfca R14: 00000000004ccac0 R15: 0000000000000000
Modules linked in:
Dumping ftrace buffer:
   (ftrace buffer empty)
CR2: 00000000000000f0
---[ end trace 8b9a0235e82d8927 ]---
RIP: 0010:is_loop_device drivers/block/loop.c:653 [inline]
RIP: 0010:loop_validate_file drivers/block/loop.c:664 [inline]
RIP: 0010:loop_change_fd drivers/block/loop.c:710 [inline]
RIP: 0010:lo_ioctl+0x24c8/0x4e00 drivers/block/loop.c:1414
Code: 85 18 01 00 00 49 8b 1c 24 b8 f0 00 00 00 48 01 c3 4c 89 e7 e8 c9 f3 89 fb 48 83 38 00 4c 8b ad 10 fe ff ff 0f 85 00 01 00 00 <4c> 8b 33 48 89 df e8 ad f3 89 fb 48 83 38 00 0f 85 f7 00 00 00 4d 
RSP: 0018:ffff88010473f858 EFLAGS: 00010246
RAX: ffff88019619f2f0 RBX: 00000000000000f0 RCX: ffff8801b611f2f0
RDX: ffff8801b611f2f0 RSI: aaaaaaaaaaaab000 RDI: ffffea000a4ecda0
RBP: ffff88010473faf0 R08: 0000000000480020 R09: 0000000000000002
R10: 0000000000000000 R11: ffffffff8639b750 R12: ffff8801b7ccf2f0
R13: ffff8801cbfede00 R14: 0000000000000000 R15: 0000000000000000
FS:  00007f21e0edc700(0000) GS:ffff88021fd00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000000000f0 CR3: 0000000102744000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400