==================================================================
BUG: KASAN: stack-out-of-bounds in profile_pc+0x186/0x1a0 arch/x86/kernel/time.c:44
Read of size 8 at addr ffffc900034ffba0 by task syz-executor/24653
CPU: 3 PID: 24653 Comm: syz-executor Not tainted 6.10.0-rc5-syzkaller-00155-g66e55ff12e73 #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:
<IRQ>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:114
print_address_description mm/kasan/report.c:377 [inline]
print_report+0xc3/0x620 mm/kasan/report.c:488
kasan_report+0xd9/0x110 mm/kasan/report.c:601
profile_pc+0x186/0x1a0 arch/x86/kernel/time.c:44
profile_tick+0xd3/0x140 kernel/profile.c:339
tick_sched_handle kernel/time/tick-sched.c:277 [inline]
tick_nohz_handler+0x380/0x530 kernel/time/tick-sched.c:297
__run_hrtimer kernel/time/hrtimer.c:1687 [inline]
__hrtimer_run_queues+0x657/0xcc0 kernel/time/hrtimer.c:1751
hrtimer_interrupt+0x31b/0x800 kernel/time/hrtimer.c:1813
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1032 [inline]
__sysvec_apic_timer_interrupt+0x10f/0x450 arch/x86/kernel/apic/apic.c:1049
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline]
sysvec_apic_timer_interrupt+0x90/0xb0 arch/x86/kernel/apic/apic.c:1043
</IRQ>
<TASK>
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:queued_read_lock_slowpath+0x131/0x2b1 kernel/locking/qrwlock.c:51
Code: 85 45 01 00 00 8b 03 84 c0 74 36 48 b8 00 00 00 00 00 fc ff df 49 89 de 48 89 dd 49 c1 ee 03 83 e5 07 49 01 c6 83 c5 03 f3 90 <41> 0f b6 06 40 38 c5 7c 08 84 c0 0f 85 1f 01 00 00 8b 03 84 c0 75
RSP: 0018:ffffc900034ffb98 EFLAGS: 00000286
RAX: 00000000000002ff RBX: ffffffff8d80a080 RCX: ffffffff8aeb316b
RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffffffff8d80a080
RBP: 0000000000000003 R08: 0000000000000001 R09: fffffbfff1b01410
R10: ffffffff8d80a083 R11: 0000000000000000 R12: 1ffff9200069ff74
R13: ffffffff8d80a084 R14: fffffbfff1b01410 R15: ffffffff81519b09
__do_wait+0x105/0x890 kernel/exit.c:1583
do_wait+0x219/0x570 kernel/exit.c:1627
kernel_wait4+0x16c/0x280 kernel/exit.c:1786
__do_sys_wait4+0x15f/0x170 kernel/exit.c:1814
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: 0033:0x7fb2fed6be57
Code: 89 7c 24 10 48 89 4c 24 18 e8 85 14 03 00 4c 8b 54 24 18 8b 54 24 14 41 89 c0 48 8b 74 24 08 8b 7c 24 10 b8 3d 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 31 44 89 c7 89 44 24 10 e8 d5 14 03 00 8b 44
RSP: 002b:00007ffc70dcf980 EFLAGS: 00000293 ORIG_RAX: 000000000000003d
RAX: ffffffffffffffda RBX: 0000000000000185 RCX: 00007fb2fed6be57
RDX: 0000000040000001 RSI: 00007ffc70dcf9fc RDI: 00000000ffffffff
RBP: 00007ffc70dcf9fc R08: 0000000000000000 R09: 00007fb2ffa60080
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000032
R13: 000000000010085a R14: 0000000000100827 R15: 00007ffc70dcfa60
</TASK>
The buggy address belongs to stack of task syz-executor/24653
and is located at offset 0 in frame:
queued_read_lock_slowpath+0x0/0x2b1
This frame has 1 object:
[32, 36) 'val'
The buggy address belongs to the virtual mapping at
[ffffc900034f8000, ffffc90003501000) created by:
kernel_clone+0xfd/0x980 kernel/fork.c:2797
The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x18 pfn:0x20b1d
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000000 0000000000000000 dead000000000122 0000000000000000
raw: 0000000000000018 0000000000000000 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x102dc2(GFP_HIGHUSER|__GFP_NOWARN|__GFP_ZERO), pid 2, tgid 2 (kthreadd), ts 950965962667, free_ts 950893896377
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x2d1/0x350 mm/page_alloc.c:1473
prep_new_page mm/page_alloc.c:1481 [inline]
get_page_from_freelist+0x1353/0x2e50 mm/page_alloc.c:3425
__alloc_pages_noprof+0x22b/0x2460 mm/page_alloc.c:4683
alloc_pages_mpol_noprof+0x275/0x610 mm/mempolicy.c:2265
vm_area_alloc_pages mm/vmalloc.c:3575 [inline]
__vmalloc_area_node mm/vmalloc.c:3651 [inline]
__vmalloc_node_range_noprof+0xa6a/0x1520 mm/vmalloc.c:3832
alloc_thread_stack_node kernel/fork.c:309 [inline]
dup_task_struct kernel/fork.c:1115 [inline]
copy_process+0x2f38/0x8f10 kernel/fork.c:2220
kernel_clone+0xfd/0x980 kernel/fork.c:2797
kernel_thread+0xc0/0x100 kernel/fork.c:2859
create_kthread kernel/kthread.c:412 [inline]
kthreadd+0x4ef/0x7d0 kernel/kthread.c:765
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
page last free pid 24599 tgid 24599 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1093 [inline]
free_unref_page+0x64a/0xe40 mm/page_alloc.c:2588
__folio_put+0x239/0x360 mm/swap.c:129
folio_put include/linux/mm.h:1513 [inline]
free_page_and_swap_cache+0x249/0x2c0 mm/swap_state.c:305
__tlb_remove_table arch/x86/include/asm/tlb.h:34 [inline]
__tlb_remove_table_free mm/mmu_gather.c:227 [inline]
tlb_remove_table_rcu+0x89/0xe0 mm/mmu_gather.c:282
rcu_do_batch kernel/rcu/tree.c:2535 [inline]
rcu_core+0x828/0x16b0 kernel/rcu/tree.c:2809
handle_softirqs+0x216/0x8f0 kernel/softirq.c:554
__do_softirq kernel/softirq.c:588 [inline]
invoke_softirq kernel/softirq.c:428 [inline]
__irq_exit_rcu kernel/softirq.c:637 [inline]
irq_exit_rcu+0xbb/0x120 kernel/softirq.c:649
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline]
sysvec_apic_timer_interrupt+0x95/0xb0 arch/x86/kernel/apic/apic.c:1043
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
Memory state around the buggy address:
ffffc900034ffa80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffffc900034ffb00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffffc900034ffb80: 00 00 00 00 f1 f1 f1 f1 04 f3 f3 f3 00 00 00 00
^
ffffc900034ffc00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffffc900034ffc80: 00 00 00 00 00 00 00 00 00 f1 f1 f1 f1 00 00 00
==================================================================
----------------
Code disassembly (best guess):
0: 85 45 01 test %eax,0x1(%rbp)
3: 00 00 add %al,(%rax)
5: 8b 03 mov (%rbx),%eax
7: 84 c0 test %al,%al
9: 74 36 je 0x41
b: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
12: fc ff df
15: 49 89 de mov %rbx,%r14
18: 48 89 dd mov %rbx,%rbp
1b: 49 c1 ee 03 shr $0x3,%r14
1f: 83 e5 07 and $0x7,%ebp
22: 49 01 c6 add %rax,%r14
25: 83 c5 03 add $0x3,%ebp
28: f3 90 pause
* 2a: 41 0f b6 06 movzbl (%r14),%eax <-- trapping instruction
2e: 40 38 c5 cmp %al,%bpl
31: 7c 08 jl 0x3b
33: 84 c0 test %al,%al
35: 0f 85 1f 01 00 00 jne 0x15a
3b: 8b 03 mov (%rbx),%eax
3d: 84 c0 test %al,%al
3f: 75 .byte 0x75