BUG: sleeping function called from invalid context at ./include/linux/sched/mm.h:321
in_atomic(): 0, irqs_disabled(): 0, non_block: 0, pid: 7103, name: syz.7.138
preempt_count: 0, expected: 0
RCU nest depth: 1, expected: 0
4 locks held by syz.7.138/7103:
#0: ffff88807ce13438 (&f->f_pos_lock){+.+.}-{4:4}, at: fdget_pos+0x247/0x310 fs/file.c:1213
#1: ffff88807f758148 (&type->i_mutex_dir_key#19){.+.+}-{4:4}, at: iterate_dir+0x4a6/0x760 fs/readdir.c:101
#2: ffffffff8ed3dfe0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#2: ffffffff8ed3dfe0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#2: ffffffff8ed3dfe0 (rcu_read_lock){....}-{1:3}, at: afs_dynroot_readdir+0x466/0xbe0 fs/afs/dynroot.c:351
#3: ffff888035ea81e0 (&mm->mmap_lock){++++}-{4:4}, at: mmap_read_trylock include/linux/mmap_lock.h:203 [inline]
#3: ffff888035ea81e0 (&mm->mmap_lock){++++}-{4:4}, at: get_mmap_lock_carefully mm/memory.c:6346 [inline]
#3: ffff888035ea81e0 (&mm->mmap_lock){++++}-{4:4}, at: lock_mm_and_find_vma+0x32/0x2f0 mm/memory.c:6406
CPU: 1 UID: 0 PID: 7103 Comm: syz.7.138 Not tainted 6.14.0-syzkaller-13189-ge48e99b6edf4 #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]
prepare_alloc_pages+0x1eb/0x610 mm/page_alloc.c:4702
__alloc_frozen_pages_noprof+0x162/0x5b0 mm/page_alloc.c:4923
alloc_pages_mpol+0x339/0x690 mm/mempolicy.c:2301
folio_alloc_mpol_noprof mm/mempolicy.c:2320 [inline]
vma_alloc_folio_noprof+0x12d/0x260 mm/mempolicy.c:2355
folio_prealloc+0x2e/0x170 mm/memory.c:-1
alloc_anon_folio mm/memory.c:4943 [inline]
do_anonymous_page mm/memory.c:5000 [inline]
do_pte_missing mm/memory.c:4158 [inline]
handle_pte_fault+0x2e45/0x61c0 mm/memory.c:5997
__handle_mm_fault mm/memory.c:6140 [inline]
handle_mm_fault+0x1030/0x1aa0 mm/memory.c:6309
do_user_addr_fault arch/x86/mm/fault.c:1388 [inline]
handle_page_fault arch/x86/mm/fault.c:1480 [inline]
exc_page_fault+0x2bb/0x920 arch/x86/mm/fault.c:1538
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0010:filldir+0x2c4/0x6a0 fs/readdir.c:292
Code: 87 55 02 00 00 0f 01 cb 0f ae e8 48 8b 44 24 30 49 89 46 08 48 8b 4c 24 10 48 8b 44 24 60 48 89 01 48 8b 44 24 18 8b 6c 24 3c <66> 89 41 10 48 98 40 88 6c 01 ff 48 89 44 24 30 4d 63 f5 42 c6 44
RSP: 0018:ffffc90003327be0 EFLAGS: 00050287
RAX: 0000000000000028 RBX: 0000200000002018 RCX: 0000200000001ff0
RDX: ffffc90011471000 RSI: 0000200000001fd8 RDI: 0000200000002018
RBP: 0000000000000004 R08: ffffffff8242905d R09: 1ffff110057c1b40
R10: dffffc0000000000 R11: ffffed10057c1b41 R12: ffff8880615a7761
R13: 000000000000000d R14: 0000200000001fd8 R15: 00007ffffffff000
dir_emit include/linux/fs.h:3861 [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
__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: 0033:0x7fd4e3b8d169
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:00007fd4e4ab3038 EFLAGS: 00000246 ORIG_RAX: 000000000000004e
RAX: ffffffffffffffda RBX: 00007fd4e3da5fa0 RCX: 00007fd4e3b8d169
RDX: 00000000000000b8 RSI: 0000200000001fc0 RDI: 0000000000000006
RBP: 00007fd4e3c0e2a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fd4e3da5fa0 R15: 00007ffdaf0925d8
</TASK>
BUG: sleeping function called from invalid context at ./include/linux/sched/mm.h:321
in_atomic(): 0, irqs_disabled(): 0, non_block: 0, pid: 7103, name: syz.7.138
preempt_count: 0, expected: 0
RCU nest depth: 1, expected: 0
4 locks held by syz.7.138/7103:
#0: ffff88807ce13eb8 (&f->f_pos_lock){+.+.}-{4:4}, at: fdget_pos+0x247/0x310 fs/file.c:1213
#1: ffff88805abadde8 (&ovl_i_mutex_dir_key[depth]#2){++++}-{4:4}, at: wrap_directory_iterator+0x5a/0xd0 fs/readdir.c:54
#2: ffff88807f758148 (&type->i_mutex_dir_key#19){++++}-{4:4}, at: iterate_dir+0x4a6/0x760 fs/readdir.c:101
#3: ffffffff8ed3dfe0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#3: ffffffff8ed3dfe0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#3: ffffffff8ed3dfe0 (rcu_read_lock){....}-{1:3}, at: afs_dynroot_readdir+0x466/0xbe0 fs/afs/dynroot.c:351
CPU: 1 UID: 0 PID: 7103 Comm: syz.7.138 Tainted: G W 6.14.0-syzkaller-13189-ge48e99b6edf4 #0 PREEMPT(full)
Tainted: [W]=WARN
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_cache_entry_add_rb fs/overlayfs/readdir.c:188 [inline]
ovl_fill_merge+0x416/0x830 fs/overlayfs/readdir.c:266
dir_emit include/linux/fs.h:3861 [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+0xfe/0x570 fs/overlayfs/readdir.c:313
ovl_dir_read_merged+0x315/0x5e0 fs/overlayfs/readdir.c:369
ovl_cache_get fs/overlayfs/readdir.c:422 [inline]
ovl_iterate+0x1196/0x21c0 fs/overlayfs/readdir.c:783
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: 0033:0x7fd4e3b8d169
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:00007fd4e4ab3038 EFLAGS: 00000246 ORIG_RAX: 000000000000004e
RAX: ffffffffffffffda RBX: 00007fd4e3da5fa0 RCX: 00007fd4e3b8d169
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000008
RBP: 00007fd4e3c0e2a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fd4e3da5fa0 R15: 00007ffdaf0925d8
</TASK>
----------------
Code disassembly (best guess):
0: 87 55 02 xchg %edx,0x2(%rbp)
3: 00 00 add %al,(%rax)
5: 0f 01 cb stac
8: 0f ae e8 lfence
b: 48 8b 44 24 30 mov 0x30(%rsp),%rax
10: 49 89 46 08 mov %rax,0x8(%r14)
14: 48 8b 4c 24 10 mov 0x10(%rsp),%rcx
19: 48 8b 44 24 60 mov 0x60(%rsp),%rax
1e: 48 89 01 mov %rax,(%rcx)
21: 48 8b 44 24 18 mov 0x18(%rsp),%rax
26: 8b 6c 24 3c mov 0x3c(%rsp),%ebp
* 2a: 66 89 41 10 mov %ax,0x10(%rcx) <-- trapping instruction
2e: 48 98 cltq
30: 40 88 6c 01 ff mov %bpl,-0x1(%rcx,%rax,1)
35: 48 89 44 24 30 mov %rax,0x30(%rsp)
3a: 4d 63 f5 movslq %r13d,%r14
3d: 42 rex.X
3e: c6 .byte 0xc6
3f: 44 rex.R