kasan: CONFIG_KASAN_INLINE enabled kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN Dumping ftrace buffer: (ftrace buffer empty) Modules linked in: CPU: 1 PID: 28201 Comm: syz-executor7 Not tainted 4.4.145-g2241aa9 #78 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8801cecbb000 task.stack: ffff8801c7cc0000 RIP: 0010:[] [] loop_validate_file+0x20d/0x400 drivers/block/loop.c:667 RSP: 0018:ffff8801c7cc7b70 EFLAGS: 00010206 RAX: 0000000000000036 RBX: dffffc0000000000 RCX: ffffc90004bf6000 RDX: 0000000000000087 RSI: ffffffff8251965d RDI: 00000000000001b0 RBP: ffff8801c7cc7b88 R08: ffff8801cecbb928 R09: 0000000000000001 R10: 0000000000000000 R11: ffff8801cecbb000 R12: 0000000000000000 R13: ffff8801d9c13980 R14: ffff8801d9c13980 R15: ffff8801d6b4c158 FS: 00007f38241e1700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020000080 CR3: 00000001d8956000 CR4: 00000000001606f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Stack: ffff8801d6b4c000 ffff8801d98e0000 0000000000000014 ffff8801c7cc7c18 ffffffff8251fbed 0000000b0000004c 0000000100000006 0000000000000000 0000000300000001 ffff8801d6b4c018 0000000041b58ab3 ffffffff84208310 Call Trace: [] loop_change_fd drivers/block/loop.c:713 [inline] [] lo_ioctl+0x3ed/0x16c0 drivers/block/loop.c:1370 [] __blkdev_driver_ioctl block/ioctl.c:288 [inline] [] blkdev_ioctl+0x7b8/0x19c0 block/ioctl.c:584 [] block_ioctl+0xde/0x120 fs/block_dev.c:1625 [] vfs_ioctl fs/ioctl.c:43 [inline] [] file_ioctl fs/ioctl.c:470 [inline] [] do_vfs_ioctl+0x63f/0xf40 fs/ioctl.c:605 [] SYSC_ioctl fs/ioctl.c:622 [inline] [] SyS_ioctl+0x8f/0xc0 fs/ioctl.c:613 [] entry_SYSCALL_64_fastpath+0x22/0x9e Code: 00 00 00 48 89 f8 48 c1 e8 03 80 3c 18 00 0f 85 f7 01 00 00 4d 8b a4 24 f0 00 00 00 49 8d bc 24 b0 01 00 00 48 89 f8 48 c1 e8 03 <80> 3c 18 00 0f 85 cc 01 00 00 4d 8b a4 24 b0 01 00 00 4c 89 e0 RIP [] loop_validate_file+0x20d/0x400 drivers/block/loop.c:667 RSP ---[ end trace f1837f330233e85c ]---