==================================================================
BUG: KASAN: stack-out-of-bounds in profile_pc+0xa4/0xe0 arch/x86/kernel/time.c:42
Read of size 8 at addr ffffc900044df380 by task syz.0.7240/29570
CPU: 1 PID: 29570 Comm: syz.0.7240 Not tainted 6.1.96-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
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 c2 b8 4c f7 f6 44 24 21 02 75 4e 41 f7 c7 00 02 00 00 74 01 fb bf 01 00 00 00 67 06 c9 f6 65 8b 05 08 13 6d 75 85 c0 74 3f 48 c7 04 24 0e 36
RSP: 0018:ffffc900044df380 EFLAGS: 00000206
RAX: 3c024187012d0e00 RBX: 1ffff9200089be74 RCX: ffffffff816ad45a
RDX: dffffc0000000000 RSI: ffffffff8aec0240 RDI: 0000000000000001
RBP: ffffc900044df410 R08: dffffc0000000000 R09: fffffbfff209384d
R10: 0000000000000000 R11: dffffc0000000001 R12: dffffc0000000000
R13: 1ffff9200089be70 R14: ffffc900044df3a0 R15: 0000000000000246
spin_unlock_irqrestore include/linux/spinlock.h:406 [inline]
unlock_page_lruvec_irqrestore include/linux/memcontrol.h:1611 [inline]
folio_batch_move_lru+0x5b3/0x720 mm/swap.c:252
folio_add_lru+0x46a/0xd70 mm/swap.c:534
shmem_get_folio_gfp+0x1713/0x3470 mm/shmem.c:1976
shmem_fault+0x235/0x9c0 mm/shmem.c:2156
__do_fault+0x136/0x4f0 mm/memory.c:4261
do_read_fault mm/memory.c:4612 [inline]
do_fault mm/memory.c:4741 [inline]
handle_pte_fault mm/memory.c:5013 [inline]
__handle_mm_fault mm/memory.c:5155 [inline]
handle_mm_fault+0x3412/0x5340 mm/memory.c:5276
faultin_page mm/gup.c:1009 [inline]
__get_user_pages+0x4f3/0x1190 mm/gup.c:1233
populate_vma_page_range+0x217/0x2b0 mm/gup.c:1590
__mm_populate+0x275/0x440 mm/gup.c:1704
mm_populate include/linux/mm.h:2797 [inline]
vm_mmap_pgoff+0x22b/0x2d0 mm/util.c:525
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f8312975b99
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:00007f8313798048 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007f8312b03fa0 RCX: 00007f8312975b99
RDX: b635773f06ebbeee RSI: 0000000000b36000 RDI: 0000000020000000
RBP: 00007f83129f677e R08: ffffffffffffffff R09: 0000000000000000
R10: 0000000000008031 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f8312b03fa0 R15: 00007fffaa368ec8
The buggy address belongs to stack of task syz.0.7240/29570
and is located at offset 0 in frame:
_raw_spin_unlock_irqrestore+0x0/0x130
This frame has 1 object:
[32, 40) 'flags.i.i.i.i'
The buggy address belongs to the virtual mapping at
[ffffc900044d8000, ffffc900044e1000) created by:
copy_process+0x637/0x4060 kernel/fork.c:2098
The buggy address belongs to the physical page:
page:ffffea0001d0af40 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x742bd
memcg:ffff888020486882
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000000 0000000000000000 dead000000000122 0000000000000000
raw: 0000000000000000 0000000000000000 00000001ffffffff ffff888020486882
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 1505581155935, free_ts 1505363650142
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:2992 [inline]
__vmalloc_area_node mm/vmalloc.c:3068 [inline]
__vmalloc_node_range+0x92b/0x1490 mm/vmalloc.c:3240
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 last free stack trace:
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1440 [inline]
free_pcp_prepare mm/page_alloc.c:1490 [inline]
free_unref_page_prepare+0xf63/0x1120 mm/page_alloc.c:3358
free_unref_page_list+0x663/0x900 mm/page_alloc.c:3499
release_pages+0x2836/0x2b40 mm/swap.c:1055
__pagevec_release+0x80/0xf0 mm/swap.c:1075
pagevec_release include/linux/pagevec.h:71 [inline]
folio_batch_release include/linux/pagevec.h:135 [inline]
invalidate_mapping_pagevec+0x621/0x730 mm/truncate.c:542
btrfs_get_bdev_and_sb+0x109/0x190 fs/btrfs/volumes.c:518
btrfs_open_one_device fs/btrfs/volumes.c:611 [inline]
open_fs_devices+0x28c/0x1180 fs/btrfs/volumes.c:1244
btrfs_mount_root+0x531/0x930 fs/btrfs/super.c:1807
legacy_get_tree+0xeb/0x180 fs/fs_context.c:632
vfs_get_tree+0x88/0x270 fs/super.c:1562
fc_mount fs/namespace.c:1043 [inline]
vfs_kern_mount+0xb8/0x150 fs/namespace.c:1073
btrfs_mount+0x39b/0xb40 fs/btrfs/super.c:1895
legacy_get_tree+0xeb/0x180 fs/fs_context.c:632
vfs_get_tree+0x88/0x270 fs/super.c:1562
do_new_mount+0x2ba/0xb40 fs/namespace.c:3051
do_mount fs/namespace.c:3394 [inline]
__do_sys_mount fs/namespace.c:3602 [inline]
__se_sys_mount+0x2d5/0x3c0 fs/namespace.c:3579
Memory state around the buggy address:
ffffc900044df280: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffffc900044df300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffffc900044df380: f1 f1 f1 f1 00 f3 f3 f3 00 00 00 00 00 00 00 00
^
ffffc900044df400: 00 00 00 00 00 00 00 00 00 00 00 00 f1 f1 f1 f1
ffffc900044df480: 00 f3 f3 f3 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================
----------------
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 c2 b8 4c f7 call 0xf74cb8d6
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 67 06 c9 f6 call 0xf6c90696 <-- trapping instruction
2f: 65 8b 05 08 13 6d 75 mov %gs:0x756d1308(%rip),%eax # 0x756d133e
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