=============================
[ BUG: Invalid wait context ]
6.12.0-syzkaller-10553-gb86545e02e8c #0 Not tainted
-----------------------------
sshd/5874 is trying to lock:
ffff88802b53af60 (batched_entropy_u8.lock){..-.}-{3:3}, at: local_lock_acquire include/linux/local_lock_internal.h:29 [inline]
ffff88802b53af60 (batched_entropy_u8.lock){..-.}-{3:3}, at: get_random_u8+0xef/0x7f0 drivers/char/random.c:551
other info that might help us debug this:
context-{2:2}
2 locks held by sshd/5874:
#0: ffff88804aa5bc60 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_downgrade include/linux/mmap_lock.h:138 [inline]
#0: ffff88804aa5bc60 (&mm->mmap_lock){++++}-{4:4}, at: vms_complete_munmap_vmas+0x70c/0x980 mm/vma.c:1180
#1: ffff88802b53ebd8 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x29/0x130 kernel/sched/core.c:598
stack backtrace:
CPU: 1 UID: 0 PID: 5874 Comm: sshd Not tainted 6.12.0-syzkaller-10553-gb86545e02e8c #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
print_lock_invalid_wait_context kernel/locking/lockdep.c:4826 [inline]
check_wait_context kernel/locking/lockdep.c:4898 [inline]
__lock_acquire+0x878/0x3c40 kernel/locking/lockdep.c:5176
lock_acquire.part.0+0x11b/0x380 kernel/locking/lockdep.c:5849
local_lock_acquire include/linux/local_lock_internal.h:29 [inline]
get_random_u8+0x107/0x7f0 drivers/char/random.c:551
get_random_u32_below include/linux/random.h:78 [inline]
kfence_guarded_alloc mm/kfence/core.c:421 [inline]
__kfence_alloc+0x4e8/0x15f0 mm/kfence/core.c:1136
kfence_alloc include/linux/kfence.h:129 [inline]
slab_alloc_node mm/slub.c:4137 [inline]
__kmalloc_cache_noprof+0x125/0x420 mm/slub.c:4309
kmalloc_noprof include/linux/slab.h:901 [inline]
add_stack_record_to_list mm/page_owner.c:172 [inline]
inc_stack_record_count mm/page_owner.c:214 [inline]
__set_page_owner+0x50f/0x790 mm/page_owner.c:329
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x2d1/0x350 mm/page_alloc.c:1556
prep_new_page mm/page_alloc.c:1564 [inline]
get_page_from_freelist+0xfce/0x2f80 mm/page_alloc.c:3474
__alloc_pages_noprof+0x223/0x25a0 mm/page_alloc.c:4751
alloc_pages_mpol_noprof+0x2c9/0x610 mm/mempolicy.c:2265
stack_depot_save_flags+0x566/0x900 lib/stackdepot.c:627
kasan_save_stack+0x42/0x60 mm/kasan/common.c:48
__kasan_record_aux_stack+0xba/0xd0 mm/kasan/generic.c:544
task_work_add+0xc0/0x3b0 kernel/task_work.c:77
task_tick_numa kernel/sched/fair.c:3607 [inline]
task_tick_fair+0x524/0x8e0 kernel/sched/fair.c:13054
sched_tick+0x1dd/0x4f0 kernel/sched/core.c:5652
update_process_times+0x19c/0x2d0 kernel/time/timer.c:2524
tick_sched_handle kernel/time/tick-sched.c:276 [inline]
tick_nohz_handler+0x376/0x530 kernel/time/tick-sched.c:297
__run_hrtimer kernel/time/hrtimer.c:1739 [inline]
__hrtimer_run_queues+0x5fb/0xae0 kernel/time/hrtimer.c:1803
hrtimer_interrupt+0x392/0x8e0 kernel/time/hrtimer.c:1865
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1038 [inline]
__sysvec_apic_timer_interrupt+0x10f/0x400 arch/x86/kernel/apic/apic.c:1055
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
sysvec_apic_timer_interrupt+0x9f/0xc0 arch/x86/kernel/apic/apic.c:1049
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x31/0x80 kernel/locking/spinlock.c:194
Code: f5 53 48 8b 74 24 10 48 89 fb 48 83 c7 18 e8 06 bd 47 f6 48 89 df e8 5e 3c 48 f6 f7 c5 00 02 00 00 75 23 9c 58 f6 c4 02 75 37 01 00 00 00 e8 a5 3e 39 f6 65 8b 05 b6 9d e0 74 85 c0 74 16 5b
RSP: 0018:ffffc90003577368 EFLAGS: 00000246
RAX: 0000000000000006 RBX: ffffffff9a81bd30 RCX: 1ffffffff2d81433
RDX: 0000000000000000 RSI: ffffffff8b6cd8a0 RDI: ffffffff8bd167e0
RBP: 0000000000000286 R08: 0000000000000001 R09: fffffbfff2d7e79f
R10: ffffffff96bf3cff R11: 0000000000000001 R12: ffff88804f18b000
R13: 0000000000000002 R14: 0000000000000002 R15: ffff88804f18b000
__debug_check_no_obj_freed lib/debugobjects.c:1108 [inline]
debug_check_no_obj_freed+0x327/0x600 lib/debugobjects.c:1129
free_pages_prepare mm/page_alloc.c:1134 [inline]
free_unref_folios+0x2f2/0x14f0 mm/page_alloc.c:2704
folios_put_refs+0x587/0x7b0 mm/swap.c:962
free_pages_and_swap_cache+0x36d/0x510 mm/swap_state.c:332
__tlb_batch_free_encoded_pages+0xf9/0x290 mm/mmu_gather.c:136
tlb_batch_pages_flush mm/mmu_gather.c:149 [inline]
tlb_flush_mmu_free mm/mmu_gather.c:366 [inline]
tlb_flush_mmu mm/mmu_gather.c:373 [inline]
tlb_finish_mmu+0x168/0x7b0 mm/mmu_gather.c:465
vms_clear_ptes+0x565/0x780 mm/vma.c:1143
vms_complete_munmap_vmas+0x1ca/0x980 mm/vma.c:1185
do_vmi_align_munmap+0x619/0x890 mm/vma.c:1444
do_vmi_munmap+0x20b/0x3e0 mm/vma.c:1492
__vm_munmap+0x14f/0x340 mm/mmap.c:1367
__do_sys_munmap mm/mmap.c:1384 [inline]
__se_sys_munmap mm/mmap.c:1381 [inline]
__x64_sys_munmap+0x59/0x80 mm/mmap.c:1381
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fddae51d817
Code: ff ff 76 10 48 8b 15 10 36 0d 00 f7 d8 64 89 02 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 b8 0b 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d e1 35 0d 00 f7 d8 64 89 01 48
RSP: 002b:00007ffc9be4f308 EFLAGS: 00000207 ORIG_RAX: 000000000000000b
RAX: ffffffffffffffda RBX: fffffffffffffe98 RCX: 00007fddae51d817
RDX: 0000000000000000 RSI: 00000000002f1000 RDI: 00007fddadb94000
RBP: 0000000000000020 R08: 00007fddadb94000 R09: 0000000000000000
R10: 0000000000000022 R11: 0000000000000207 R12: 00007fddadb94000
R13: 00007fddadb94010 R14: 00000000002f0000 R15: 00007ffc9be4f4e8
----------------
Code disassembly (best guess):
0: f5 cmc
1: 53 push %rbx
2: 48 8b 74 24 10 mov 0x10(%rsp),%rsi
7: 48 89 fb mov %rdi,%rbx
a: 48 83 c7 18 add $0x18,%rdi
e: e8 06 bd 47 f6 call 0xf647bd19
13: 48 89 df mov %rbx,%rdi
16: e8 5e 3c 48 f6 call 0xf6483c79
1b: f7 c5 00 02 00 00 test $0x200,%ebp
21: 75 23 jne 0x46
23: 9c pushf
24: 58 pop %rax
25: f6 c4 02 test $0x2,%ah
28: 75 37 jne 0x61
* 2a: bf 01 00 00 00 mov $0x1,%edi <-- trapping instruction
2f: e8 a5 3e 39 f6 call 0xf6393ed9
34: 65 8b 05 b6 9d e0 74 mov %gs:0x74e09db6(%rip),%eax # 0x74e09df1
3b: 85 c0 test %eax,%eax
3d: 74 16 je 0x55
3f: 5b pop %rbx