------------[ cut here ]------------ proc_dir_entry 'afs/^]$[+%]0${' already registered WARNING: CPU: 0 PID: 8309 at fs/proc/generic.c:371 proc_register+0x34c/0x700 fs/proc/generic.c:371 Kernel panic - not syncing: panic_on_warn set ... CPU: 0 PID: 8309 Comm: kworker/0:4 Not tainted 5.9.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: afs afs_manage_cell_work Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x198/0x1fd lib/dump_stack.c:118 panic+0x382/0x7fb kernel/panic.c:231 __warn.cold+0x20/0x4b kernel/panic.c:600 report_bug+0x1bd/0x210 lib/bug.c:198 handle_bug+0x38/0x90 arch/x86/kernel/traps.c:234 exc_invalid_op+0x14/0x40 arch/x86/kernel/traps.c:254 asm_exc_invalid_op+0x12/0x20 arch/x86/include/asm/idtentry.h:536 RIP: 0010:proc_register+0x34c/0x700 fs/proc/generic.c:371 Code: df 48 89 f9 48 c1 e9 03 80 3c 01 00 0f 85 5d 03 00 00 48 8b 44 24 28 48 c7 c7 a0 62 9a 88 48 8b b0 d8 00 00 00 e8 46 03 5d ff <0f> 0b 48 c7 c7 e0 f6 1e 8a e8 36 df 3d 06 48 8b 4c 24 38 48 b8 00 RSP: 0018:ffffc90009dffac8 EFLAGS: 00010282 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: ffff8880923a4480 RSI: ffffffff815f5a55 RDI: fffff520013bff4b RBP: ffff888088829b88 R08: 0000000000000001 R09: ffff8880ae4318e7 R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880904699d8 R13: ffff8880931d3340 R14: dffffc0000000000 R15: 000000000000000a proc_mkdir_data+0x140/0x1a0 fs/proc/generic.c:487 proc_net_mkdir include/linux/proc_fs.h:201 [inline] afs_proc_cell_setup+0xb2/0x1f0 fs/afs/proc.c:619 afs_activate_cell fs/afs/cell.c:684 [inline] afs_manage_cell fs/afs/cell.c:768 [inline] afs_manage_cell_work+0x5b7/0x11c0 fs/afs/cell.c:832 process_one_work+0x94c/0x1670 kernel/workqueue.c:2269 worker_thread+0x64c/0x1120 kernel/workqueue.c:2415 kthread+0x3b5/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 Kernel Offset: disabled Rebooting in 86400 seconds..