kasan: CONFIG_KASAN_INLINE enabled kasan: GPF could be caused by NULL-ptr deref or user memory access general protection fault: 0000 [#1] SMP KASAN Dumping ftrace buffer: (ftrace buffer empty) Modules linked in: CPU: 0 PID: 5279 Comm: syz-executor7 Not tainted 4.14.0-rc5+ #44 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8801cfdca2c0 task.stack: ffff8801d2290000 RIP: 0010:loop_set_fd drivers/block/loop.c:885 [inline] RIP: 0010:lo_ioctl+0x672/0x1b70 drivers/block/loop.c:1353 RSP: 0018:ffff8801d2297b70 EFLAGS: 00010202 RAX: 0000000000010000 RBX: dffffc0000000000 RCX: ffffc90001f54000 RDX: 0000000000000037 RSI: ffffffff8353a8e2 RDI: 00000000000001b8 RBP: ffff8801d2297be8 R08: 0000000000000001 R09: 1ffff1003a452f1f R10: ffff8801d22978c0 R11: 0000000000000001 R12: 0000000000000000 R13: ffff8801d5c73b40 R14: ffff8801d715e100 R15: ffff8801d5c73c90 FS: 0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:00000000f77c4b40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 0000000020e65f5c CR3: 00000001d4ee7000 CR4: 00000000001406f0 DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: lo_compat_ioctl+0xab/0x140 drivers/block/loop.c:1551 compat_blkdev_ioctl+0x3ae/0x1840 block/compat_ioctl.c:405 C_SYSC_ioctl fs/compat_ioctl.c:1593 [inline] compat_SyS_ioctl+0x1d7/0x3290 fs/compat_ioctl.c:1540 do_syscall_32_irqs_on arch/x86/entry/common.c:329 [inline] do_fast_syscall_32+0x3f2/0xf05 arch/x86/entry/common.c:391 entry_SYSENTER_compat+0x51/0x60 arch/x86/entry/entry_64_compat.S:124 RIP: 0023:0xf7fc8c79 RSP: 002b:00000000f77c405c EFLAGS: 00000296 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 0000000000000016 RCX: 0000000000004c00 RDX: 0000000000000005 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Code: 00 00 00 48 89 fa 48 c1 ea 03 80 3c 1a 00 0f 85 6f 14 00 00 4d 8b a4 24 f0 00 00 00 49 8d bc 24 b8 01 00 00 48 89 fa 48 c1 ea 03 <80> 3c 1a 00 0f 85 44 14 00 00 4d 8b a4 24 b8 01 00 00 4c 89 e2 RIP: loop_set_fd drivers/block/loop.c:885 [inline] RSP: ffff8801d2297b70 RIP: lo_ioctl+0x672/0x1b70 drivers/block/loop.c:1353 RSP: ffff8801d2297b70 ---[ end trace 88e271de8cf2f57b ]--- Kernel panic - not syncing: Fatal exception Dumping ftrace buffer: (ftrace buffer empty) Kernel Offset: disabled Rebooting in 86400 seconds..