==================================================================
BUG: KASAN: stack-out-of-bounds in profile_pc+0xa4/0xe0 arch/x86/kernel/time.c:42
Read of size 8 at addr ffffc90000ae6b40 by task kworker/u4:2/37
CPU: 0 PID: 37 Comm: kworker/u4:2 Not tainted 6.1.87-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
Workqueue: writeback wb_workfn (flush-7:3)
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
print_address_description mm/kasan/report.c:284 [inline]
print_report+0x15f/0x4f0 mm/kasan/report.c:395
kasan_report+0x136/0x160 mm/kasan/report.c:495
profile_pc+0xa4/0xe0 arch/x86/kernel/time.c:42
profile_tick+0xee/0x170 kernel/profile.c:339
tick_sched_handle kernel/time/tick-sched.c:255 [inline]
tick_sched_timer+0x390/0x550 kernel/time/tick-sched.c:1501
__run_hrtimer kernel/time/hrtimer.c:1686 [inline]
__hrtimer_run_queues+0x5a7/0xe50 kernel/time/hrtimer.c:1750
hrtimer_interrupt+0x392/0x980 kernel/time/hrtimer.c:1812
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1095 [inline]
__sysvec_apic_timer_interrupt+0x156/0x580 arch/x86/kernel/apic/apic.c:1112
sysvec_apic_timer_interrupt+0x8c/0xb0 arch/x86/kernel/apic/apic.c:1106
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:653
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0xd4/0x130 kernel/locking/spinlock.c:194
Code: 9c 8f 44 24 20 42 80 3c 23 00 74 08 4c 89 f7 e8 f2 3b 4d f7 f6 44 24 21 02 75 4e 41 f7 c7 00 02 00 00 74 01 fb bf 01 00 00 00 d7 88 c9 f6 65 8b 05 78 a4 6d 75 85 c0 74 3f 48 c7 04 24 0e 36
RSP: 0018:ffffc90000ae6b40 EFLAGS: 00000206
RAX: 6a93b2ee35c21c00 RBX: 1ffff9200015cd6c RCX: ffffffff816ad11a
RDX: dffffc0000000000 RSI: ffffffff8aec01c0 RDI: 0000000000000001
RBP: ffffc90000ae6bd0 R08: dffffc0000000000 R09: fffffbfff209345b
R10: 0000000000000000 R11: dffffc0000000001 R12: dffffc0000000000
R13: 1ffff9200015cd68 R14: ffffc90000ae6b60 R15: 0000000000000246
spin_unlock_irqrestore include/linux/spinlock.h:406 [inline]
__folio_start_writeback+0x57f/0x10c0 mm/page-writeback.c:3000
__mpage_writepage+0x12da/0x1930 fs/mpage.c:609
write_cache_pages+0x92e/0x15c0 mm/page-writeback.c:2360
mpage_writepages+0x103/0x1d0 fs/mpage.c:664
do_writepages+0x3a2/0x670 mm/page-writeback.c:2469
__writeback_single_inode+0x15d/0x11e0 fs/fs-writeback.c:1612
writeback_sb_inodes+0xc2b/0x1b20 fs/fs-writeback.c:1903
wb_writeback+0x49d/0xe10 fs/fs-writeback.c:2077
wb_do_writeback fs/fs-writeback.c:2220 [inline]
wb_workfn+0x427/0x1020 fs/fs-writeback.c:2260
process_one_work+0x8a9/0x11d0 kernel/workqueue.c:2292
worker_thread+0xa47/0x1200 kernel/workqueue.c:2439
kthread+0x28d/0x320 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
The buggy address belongs to stack of task kworker/u4:2/37
and is located at offset 0 in frame:
_raw_spin_unlock_irqrestore+0x0/0x130 kernel/locking/spinlock.c:187
This frame has 1 object:
[32, 40) 'flags.i.i.i.i'
The buggy address belongs to the virtual mapping at
[ffffc90000ae0000, ffffc90000ae9000) created by:
copy_process+0x637/0x4060 kernel/fork.c:2098
The buggy address belongs to the physical page:
page:ffffea00005bb680 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x16eda
flags: 0xfff80000000000(node=0|zone=1|lastcpupid=0xfff)
raw: 00fff80000000000 0000000000000000 dead000000000122 0000000000000000
raw: 0000000000000000 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 0x2dc2(GFP_KERNEL|__GFP_HIGHMEM|__GFP_NOWARN|__GFP_ZERO), pid 2, tgid 2 (kthreadd), ts 2485247094, free_ts 0
set_page_owner include/linux/page_owner.h:31 [inline]
post_alloc_hook+0x18d/0x1b0 mm/page_alloc.c:2513
prep_new_page mm/page_alloc.c:2520 [inline]
get_page_from_freelist+0x31a1/0x3320 mm/page_alloc.c:4279
__alloc_pages+0x28d/0x770 mm/page_alloc.c:5547
vm_area_alloc_pages mm/vmalloc.c:2983 [inline]
__vmalloc_area_node mm/vmalloc.c:3051 [inline]
__vmalloc_node_range+0x96c/0x1460 mm/vmalloc.c:3223
alloc_thread_stack_node kernel/fork.c:311 [inline]
dup_task_struct+0x3e5/0x6d0 kernel/fork.c:988
copy_process+0x637/0x4060 kernel/fork.c:2098
kernel_clone+0x222/0x920 kernel/fork.c:2682
kernel_thread+0x152/0x1d0 kernel/fork.c:2742
create_kthread kernel/kthread.c:399 [inline]
kthreadd+0x596/0x760 kernel/kthread.c:746
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
page_owner free stack trace missing
Memory state around the buggy address:
ffffc90000ae6a00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffffc90000ae6a80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffffc90000ae6b00: 00 00 00 00 00 00 00 00 f1 f1 f1 f1 00 f3 f3 f3
^
ffffc90000ae6b80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffffc90000ae6c00: 00 00 00 00 00 00 00 00 f1 f1 f1 f1 00 f2 f2 f2
==================================================================
----------------
Code disassembly (best guess):
0: 9c pushf
1: 8f 44 24 20 pop 0x20(%rsp)
5: 42 80 3c 23 00 cmpb $0x0,(%rbx,%r12,1)
a: 74 08 je 0x14
c: 4c 89 f7 mov %r14,%rdi
f: e8 f2 3b 4d f7 call 0xf74d3c06
14: f6 44 24 21 02 testb $0x2,0x21(%rsp)
19: 75 4e jne 0x69
1b: 41 f7 c7 00 02 00 00 test $0x200,%r15d
22: 74 01 je 0x25
24: fb sti
25: bf 01 00 00 00 mov $0x1,%edi
* 2a: e8 d7 88 c9 f6 call 0xf6c98906 <-- trapping instruction
2f: 65 8b 05 78 a4 6d 75 mov %gs:0x756da478(%rip),%eax # 0x756da4ae
36: 85 c0 test %eax,%eax
38: 74 3f je 0x79
3a: 48 rex.W
3b: c7 .byte 0xc7
3c: 04 24 add $0x24,%al
3e: 0e (bad)
3f: 36 ss