overlayfs: filesystem on './file0' not supported as upperdir
Node 0 DMA free:15908kB min:164kB low:204kB high:244kB active_anon:0kB inactive_anon:0kB active_file:0kB inactive_file:0kB unevictable:0kB writepending:0kB present:15992kB managed:15908kB mlocked:0kB kernel_stack:0kB pagetables:0kB bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:0kB
9pnet: Insufficient options for proto=fd
WARNING: CPU: 0 PID: 19290 at fs/overlayfs/dir.c:263 ovl_instantiate+0x369/0x400 fs/overlayfs/dir.c:263
Kernel panic - not syncing: panic_on_warn set ...
CPU: 0 PID: 19290 Comm: syz-executor1 Not tainted 4.20.0-rc7+ #161
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1d3/0x2c6 lib/dump_stack.c:113
 panic+0x2ad/0x55c kernel/panic.c:188
lowmem_reserve[]: 0 2818 6321 6321
 __warn.cold.8+0x20/0x45 kernel/panic.c:540
Node 0 DMA32 free:2887356kB min:30052kB low:37564kB high:45076kB active_anon:0kB inactive_anon:0kB active_file:0kB inactive_file:0kB unevictable:0kB writepending:0kB present:3129332kB managed:2888756kB mlocked:0kB kernel_stack:0kB pagetables:0kB bounce:0kB free_pcp:1400kB local_pcp:1332kB free_cma:0kB
 report_bug+0x254/0x2d0 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:178 [inline]
 do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:271
 do_invalid_op+0x36/0x40 arch/x86/kernel/traps.c:290
 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:973
RIP: 0010:ovl_instantiate+0x369/0x400 fs/overlayfs/dir.c:263
kobject: 'loop0' (0000000022c22345): kobject_uevent_env
Code: c3 89 c6 e8 59 44 f1 fe 85 db 0f 85 9e 00 00 00 e8 3c 43 f1 fe 4c 89 e7 45 31 f6 e8 e1 f6 46 ff e9 ec fe ff ff e8 27 43 f1 fe <0f> 0b e9 e0 fe ff ff e8 1b 43 f1 fe 0f 0b e9 63 ff ff ff e8 6f 4b
kobject: 'loop0' (0000000022c22345): fill_kobj_path: path = '/devices/virtual/block/loop0'
RSP: 0018:ffff88817cf279a8 EFLAGS: 00010212
RAX: 0000000000040000 RBX: ffff88817cf27a40 RCX: ffffc90007de6000
RDX: 00000000000229c2 RSI: ffffffff828d74b9 RDI: 0000000000000007
RBP: ffff88817cf27a68 R08: ffff88817d0b0180 R09: ffffed102f9e4ee8
R10: ffffed102f9e4ee8 R11: 0000000000000003 R12: ffff888173c4a580
R13: ffff88817cf279e0 R14: ffffffffffffff8c R15: 0000000000000000
 ovl_create_over_whiteout fs/overlayfs/dir.c:518 [inline]
 ovl_create_or_link+0xad6/0x1560 fs/overlayfs/dir.c:582
lowmem_reserve[]: 0 0 3503 3503
9pnet: Insufficient options for proto=fd
 ovl_create_object+0x2e9/0x3a0 fs/overlayfs/dir.c:616
Node 0 Normal free:1930160kB min:37364kB low:46704kB high:56044kB active_anon:619312kB inactive_anon:764kB active_file:31320kB inactive_file:154156kB unevictable:0kB writepending:580kB present:4718592kB managed:3587816kB mlocked:0kB kernel_stack:8480kB pagetables:6940kB bounce:0kB free_pcp:1576kB local_pcp:532kB free_cma:0kB
 ovl_symlink+0x24/0x30 fs/overlayfs/dir.c:651
 vfs_symlink+0x37a/0x5d0 fs/namei.c:4127
 do_symlinkat+0x242/0x2d0 fs/namei.c:4154
lowmem_reserve[]: 0 0 0 0
 __do_sys_symlink fs/namei.c:4173 [inline]
 __se_sys_symlink fs/namei.c:4171 [inline]
 __x64_sys_symlink+0x59/0x80 fs/namei.c:4171
Node 0 DMA: 1*4kB (U) 0*8kB 0*16kB 1*32kB (U) 2*64kB (U) 1*128kB (U) 1*256kB (U) 0*512kB 1*1024kB (U) 1*2048kB (M) 3*4096kB (M) = 15908kB
 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
kobject: 'loop0' (0000000022c22345): kobject_uevent_env
RIP: 0033:0x457669
kobject: 'loop0' (0000000022c22345): fill_kobj_path: path = '/devices/virtual/block/loop0'
Code: fd b3 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 b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fd581f9ac78 EFLAGS: 00000246 ORIG_RAX: 0000000000000058
RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 0000000000457669
RDX: 0000000000000000 RSI: 0000000020000140 RDI: 0000000020000040
RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fd581f9b6d4
R13: 00000000004c5364 R14: 00000000004d9810 R15: 00000000ffffffff
Kernel Offset: disabled
Rebooting in 86400 seconds..