kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 25259 Comm: syz-executor.2 Not tainted 5.3.0-rc1-next-20190724 #50
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:map_id_range_down+0x87/0x370 kernel/user_namespace.c:293
Code: 6f 81 c7 00 f1 f1 f1 f1 c7 40 04 00 04 f3 f3 65 48 8b 04 25 28 00 00 00 48 89 45 d0 31 c0 e8 e0 a5 03 00 4c 89 f8 48 c1 e8 03 <42> 0f b6 04 28 84 c0 74 08 3c 03 0f 8e 9f 02 00 00 4c 8b ad 68 ff
RSP: 0018:ffff88809714fa30 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff88809714faa8 RCX: ffffc9000a377000
RDX: 000000000000a5dc RSI: ffffffff816f0a40 RDI: 0000000000000000
RBP: ffff88809714fad0 R08: ffff88808eb9a700 R09: ffffed1014f526fb
R10: ffffed1014f526fa R11: 0000000000000003 R12: 0000000000000001
R13: dffffc0000000000 R14: 0000000000000000 R15: 0000000000000000
FS:  00007f4f84d3c700(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fcc9ff7e000 CR3: 0000000058dc3000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 map_id_down kernel/user_namespace.c:312 [inline]
 make_kuid+0x23/0x30 kernel/user_namespace.c:389
 fuse_parse_param+0x2cb/0x750 fs/fuse/inode.c:523
 vfs_parse_fs_param+0x2ca/0x540 fs/fs_context.c:145
 vfs_parse_fs_string+0x105/0x170 fs/fs_context.c:188
 generic_parse_monolithic+0x181/0x200 fs/fs_context.c:228
 parse_monolithic_mount_data+0x69/0x90 fs/fs_context.c:708
 do_remount fs/namespace.c:2520 [inline]
 do_mount+0x924/0x1c30 fs/namespace.c:3102
 ksys_mount+0xdb/0x150 fs/namespace.c:3320
 __do_sys_mount fs/namespace.c:3334 [inline]
 __se_sys_mount fs/namespace.c:3331 [inline]
 __x64_sys_mount+0xbe/0x150 fs/namespace.c:3331
 do_syscall_64+0xfa/0x760 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x459829
Code: fd b7 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 cb b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f4f84d3bc78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000000459829
RDX: 0000000020000440 RSI: 0000000020000400 RDI: 0000000020000180
RBP: 000000000075bf20 R08: 00000000200005c0 R09: 0000000000000000
R10: 0000000000000020 R11: 0000000000000246 R12: 00007f4f84d3c6d4
R13: 00000000004c5cd4 R14: 00000000004da588 R15: 00000000ffffffff
Modules linked in:
---[ end trace d1bbf7d29c3531c7 ]---
RIP: 0010:map_id_range_down+0x87/0x370 kernel/user_namespace.c:293
Code: 6f 81 c7 00 f1 f1 f1 f1 c7 40 04 00 04 f3 f3 65 48 8b 04 25 28 00 00 00 48 89 45 d0 31 c0 e8 e0 a5 03 00 4c 89 f8 48 c1 e8 03 <42> 0f b6 04 28 84 c0 74 08 3c 03 0f 8e 9f 02 00 00 4c 8b ad 68 ff
RSP: 0018:ffff88809714fa30 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff88809714faa8 RCX: ffffc9000a377000
RDX: 000000000000a5dc RSI: ffffffff816f0a40 RDI: 0000000000000000
RBP: ffff88809714fad0 R08: ffff88808eb9a700 R09: ffffed1014f526fb
R10: ffffed1014f526fa R11: 0000000000000003 R12: 0000000000000001
R13: dffffc0000000000 R14: 0000000000000000 R15: 0000000000000000
FS:  00007f4f84d3c700(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffff600400 CR3: 0000000058dc3000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400