------------[ cut here ]------------
WARNING: CPU: 1 PID: 18900 at lib/radix-tree.c:581 delete_node+0x1fb/0x960 lib/radix-tree.c:581
Kernel panic - not syncing: panic_on_warn set ...
CPU: 1 PID: 18900 Comm: syz-executor.0 Not tainted 5.5.0-rc7-syzkaller #0
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+0x197/0x210 lib/dump_stack.c:118
 panic+0x2e3/0x75c kernel/panic.c:221
 __warn.cold+0x2f/0x3e kernel/panic.c:582
 report_bug+0x289/0x300 lib/bug.c:195
 fixup_bug arch/x86/kernel/traps.c:174 [inline]
 fixup_bug arch/x86/kernel/traps.c:169 [inline]
 do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:267
 do_invalid_op+0x37/0x50 arch/x86/kernel/traps.c:286
 invalid_op+0x23/0x30 arch/x86/entry/entry_64.S:1027
RIP: 0010:delete_node+0x1fb/0x960 lib/radix-tree.c:581
Code: ea 48 c1 ea 03 48 c7 40 40 00 00 00 00 42 80 3c 22 00 0f 85 3f 06 00 00 48 8b 53 18 49 39 d5 0f 84 00 04 00 00 e8 15 55 a7 f9 <0f> 0b 48 c7 c6 30 77 cd 87 4c 89 ef e8 c4 dd 94 f9 4d 85 f6 0f 85
RSP: 0018:ffffc90001d7f940 EFLAGS: 00010093
RAX: ffff88805e1dc5c0 RBX: ffff888000c53c40 RCX: 0000000000000002
RDX: 0000000000000000 RSI: ffffffff87cda24b RDI: ffff888092e6db82
RBP: ffffc90001d7f9a8 R08: ffff88805e1dc5c0 R09: ffffed10125cdbb6
R10: ffffed10125cdbb5 R11: ffff888092e6ddaf R12: dffffc0000000000
R13: ffff888000c53c58 R14: ffff888092e6db80 R15: 0000000000000032
 __radix_tree_delete+0x19d/0x390 lib/radix-tree.c:1388
 radix_tree_delete_item+0xfe/0x270 lib/radix-tree.c:1439
 idr_remove+0x49/0x60 lib/idr.c:154
 free_pid+0xc9/0x2c0 kernel/pid.c:153
 copy_process+0x53a8/0x7230 kernel/fork.c:2304
 _do_fork+0x146/0x1090 kernel/fork.c:2421
 __do_sys_clone kernel/fork.c:2576 [inline]
 __se_sys_clone kernel/fork.c:2557 [inline]
 __x64_sys_clone+0x19a/0x260 kernel/fork.c:2557
 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45dd19
Code: ff 48 85 f6 0f 84 d7 8c fb ff 48 83 ee 10 48 89 4e 08 48 89 3e 48 89 d7 4c 89 c2 4d 89 c8 4c 8b 54 24 08 b8 38 00 00 00 0f 05 <48> 85 c0 0f 8c ae 8c fb ff 74 01 c3 31 ed 48 f7 c7 00 00 01 00 75
RSP: 002b:0000000000a6fac8 EFLAGS: 00000202 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007fc17113f700 RCX: 000000000045dd19
RDX: 00007fc17113f9d0 RSI: 00007fc17113edb0 RDI: 00000000003d0f00
RBP: 0000000000a6fce0 R08: 00007fc17113f700 R09: 00007fc17113f700
R10: 00007fc17113f9d0 R11: 0000000000000202 R12: 0000000000000000
R13: 0000000000a6fb7f R14: 0000000000020000 R15: 00000000017c5b70
Kernel Offset: disabled
Rebooting in 86400 seconds..