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: 23995 Comm: syz-executor5 Not tainted 4.4.141-g1b37d68 #7 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8800ba7bb000 task.stack: ffff8801c8620000 RIP: 0010:[] [] loop_validate_file+0x20d/0x400 drivers/block/loop.c:667 RSP: 0018:ffff8801c8627ad0 EFLAGS: 00010206 RAX: 0000000000000036 RBX: dffffc0000000000 RCX: ffffc90005af3000 RDX: 000000000000008b RSI: ffffffff8251542d RDI: 00000000000001b0 RBP: ffff8801c8627ae8 R08: ffff8800ba7bb928 R09: 0000000000000001 R10: 0000000000000000 R11: ffff8800ba7bb000 R12: 0000000000000000 R13: ffff8800b9ca0b80 R14: ffff8800b9ca0b80 R15: ffff8801d6a0a558 FS: 0000000000000000(0000) GS:ffff8801db300000(0063) knlGS:00000000f57deb40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 00007f795eba9e18 CR3: 00000000baaec000 CR4: 00000000001606f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Stack: ffff8801d6a0a400 ffff8800ba974e00 0000000000000015 ffff8801c8627b78 ffffffff8251b9bd ffff8801d9a86860 0000000000000001 0000000000000082 ffff8800ba7bb8f8 ffff8801d6a0a418 ffff8800ba7bb8d0 8b050428ba56b609 Call Trace: [] loop_change_fd drivers/block/loop.c:713 [inline] [] lo_ioctl+0x3ed/0x16c0 drivers/block/loop.c:1370 [] lo_compat_ioctl+0xb2/0x140 drivers/block/loop.c:1560 [] compat_blkdev_ioctl+0x395/0x3a10 block/compat_ioctl.c:751 [] C_SYSC_ioctl fs/compat_ioctl.c:1592 [inline] [] compat_SyS_ioctl+0x484/0x2270 fs/compat_ioctl.c:1544 [] do_syscall_32_irqs_on arch/x86/entry/common.c:393 [inline] [] do_fast_syscall_32+0x326/0x8b0 arch/x86/entry/common.c:460 [] sysenter_flags_fixed+0xd/0x17 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 [ 362.355575] IPVS: sync thread started: state = MASTER, mcast_ifn = lo, syncid = 0, id = 0 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 083710e0d5a79991 ]--- device lo entered promiscuous mode