overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off.
BUG: sleeping function called from invalid context at ./include/linux/sched/mm.h:321
in_atomic(): 0, irqs_disabled(): 0, non_block: 0, pid: 7691, name: syz.4.603
preempt_count: 0, expected: 0
RCU nest depth: 1, expected: 0
4 locks held by syz.4.603/7691:
 #0: ffff88802fe687f8 (&f->f_pos_lock){+.+.}-{4:4}, at: fdget_pos+0x247/0x310 fs/file.c:1213
 #1: ffff88807a33cc90 (&ovl_i_mutex_dir_key[depth]){++++}-{4:4}, at: wrap_directory_iterator+0x5a/0xd0 fs/readdir.c:54
 #2: ffff88807a9f8148 (&type->i_mutex_dir_key#11){.+.+}-{4:4}, at: iterate_dir+0x4a6/0x760 fs/readdir.c:101
 #3: ffffffff8ed3d200 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
 #3: ffffffff8ed3d200 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
 #3: ffffffff8ed3d200 (rcu_read_lock){....}-{1:3}, at: afs_dynroot_readdir+0x466/0xbe0 fs/afs/dynroot.c:351
CPU: 1 UID: 0 PID: 7691 Comm: syz.4.603 Not tainted 6.15.0-rc1-next-20250408-syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
 __might_resched+0x558/0x6c0 kernel/sched/core.c:8818
 might_alloc include/linux/sched/mm.h:321 [inline]
 slab_pre_alloc_hook mm/slub.c:4102 [inline]
 slab_alloc_node mm/slub.c:4180 [inline]
 __do_kmalloc_node mm/slub.c:4330 [inline]
 __kmalloc_noprof+0xd0/0x4d0 mm/slub.c:4343
 kmalloc_noprof include/linux/slab.h:909 [inline]
 ovl_cache_entry_new+0x39/0x7b0 fs/overlayfs/readdir.c:152
 ovl_fill_lowest fs/overlayfs/readdir.c:211 [inline]
 ovl_fill_merge+0x2b8/0x830 fs/overlayfs/readdir.c:268
 dir_emit include/linux/fs.h:3867 [inline]
 afs_dynroot_readdir_cells fs/afs/dynroot.c:310 [inline]
 afs_dynroot_readdir+0x814/0xbe0 fs/afs/dynroot.c:352
 iterate_dir+0x5a9/0x760 fs/readdir.c:108
 ovl_dir_read+0x15d/0x6f0 fs/overlayfs/readdir.c:314
 ovl_dir_read_merged+0x4ae/0x5e0 fs/overlayfs/readdir.c:380
 ovl_cache_get fs/overlayfs/readdir.c:423 [inline]
 ovl_iterate+0x10ea/0x2050 fs/overlayfs/readdir.c:784
 wrap_directory_iterator+0x91/0xd0 fs/readdir.c:65
 iterate_dir+0x5a9/0x760 fs/readdir.c:108
 __do_sys_getdents fs/readdir.c:322 [inline]
 __se_sys_getdents+0x1ff/0x4e0 fs/readdir.c:308
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f8f0058d169
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f8f0146e038 EFLAGS: 00000246 ORIG_RAX: 000000000000004e
RAX: ffffffffffffffda RBX: 00007f8f007a5fa0 RCX: 00007f8f0058d169
RDX: 0000000000000058 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 00007f8f0060e2a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f8f007a5fa0 R15: 00007ffc135f0038
 </TASK>