---[ end trace 4be1a6fa65dcc313 ]---
==================================================================
BUG: KASAN: null-ptr-deref in atomic_add_return include/asm-generic/atomic-instrumented.h:71 [inline]
BUG: KASAN: null-ptr-deref in atomic_inc_return include/linux/atomic-fallback.h:284 [inline]
BUG: KASAN: null-ptr-deref in ihold+0x1b/0x50 fs/inode.c:421
Write of size 4 at addr 0000000000000160 by task syz.0.1020/4039

CPU: 0 PID: 4039 Comm: syz.0.1020 Tainted: G        W         5.4.276-syzkaller-00020-g4275fce9fe94 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1d8/0x241 lib/dump_stack.c:118
 __kasan_report+0xe9/0x120 mm/kasan/report.c:520
 kasan_report+0x30/0x60 mm/kasan/common.c:653
 check_memory_region_inline mm/kasan/generic.c:141 [inline]
 check_memory_region+0x272/0x280 mm/kasan/generic.c:191
 atomic_add_return include/asm-generic/atomic-instrumented.h:71 [inline]
 atomic_inc_return include/linux/atomic-fallback.h:284 [inline]
 ihold+0x1b/0x50 fs/inode.c:421
 d_delete_notify include/linux/fsnotify.h:221 [inline]
 vfs_rmdir+0x1e0/0x3c0 fs/namei.c:4040
 incfs_kill_sb+0x105/0x200 fs/incfs/vfs.c:1944
 deactivate_locked_super+0xa8/0x110 fs/super.c:335
 deactivate_super+0x1e2/0x2a0 fs/super.c:366
 cleanup_mnt+0x44e/0x500 fs/namespace.c:1102
 task_work_run+0x140/0x170 kernel/task_work.c:113
 exit_task_work include/linux/task_work.h:22 [inline]
 do_exit+0xcaf/0x2bc0 kernel/exit.c:859
 do_group_exit+0x138/0x300 kernel/exit.c:982
 get_signal+0xdb1/0x1440 kernel/signal.c:2735
 do_signal+0xb0/0x11f0 arch/x86/kernel/signal.c:809
 exit_to_usermode_loop+0xc0/0x1a0 arch/x86/entry/common.c:159
 prepare_exit_to_usermode+0x199/0x200 arch/x86/entry/common.c:194
 ret_from_fork+0x15/0x30 arch/x86/entry/entry_64.S:346
RIP: 0033:0x7eff466ffb99
Code: Bad RIP value.
RSP: 002b:00007eff45980ff8 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: 0000000000000000 RBX: 00007eff4688dfa0 RCX: 00007eff466ffb99
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007eff4678077e R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007eff4688dfa0 R15: 00007ffc67705c08
===========================