==================================================================
BUG: KASAN: slab-out-of-bounds in instrument_atomic_write include/linux/instrumented.h:87 [inline]
BUG: KASAN: slab-out-of-bounds in clear_bit include/asm-generic/bitops/instrumented-atomic.h:41 [inline]
BUG: KASAN: slab-out-of-bounds in clear_ti_thread_flag include/linux/thread_info.h:94 [inline]
BUG: KASAN: slab-out-of-bounds in clear_tsk_thread_flag include/linux/sched.h:2024 [inline]
BUG: KASAN: slab-out-of-bounds in clear_tsk_need_resched include/linux/sched.h:2055 [inline]
BUG: KASAN: slab-out-of-bounds in __schedule+0x72f/0x40d0 kernel/sched/core.c:6525
Write of size 8 at addr ffff888044c11dbf by task syz.2.1500/11494
CPU: 1 PID: 11494 Comm: syz.2.1500 Not tainted 6.1.142-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call Trace:
<TASK>
dump_stack_lvl+0x168/0x22e lib/dump_stack.c:106
print_address_description mm/kasan/report.c:316 [inline]
print_report+0xa8/0x220 mm/kasan/report.c:427
kasan_report+0x10b/0x140 mm/kasan/report.c:531
check_region_inline mm/kasan/generic.c:-1 [inline]
kasan_check_range+0x27b/0x290 mm/kasan/generic.c:189
instrument_atomic_write include/linux/instrumented.h:87 [inline]
clear_bit include/asm-generic/bitops/instrumented-atomic.h:41 [inline]
clear_ti_thread_flag include/linux/thread_info.h:94 [inline]
clear_tsk_thread_flag include/linux/sched.h:2024 [inline]
clear_tsk_need_resched include/linux/sched.h:2055 [inline]
__schedule+0x72f/0x40d0 kernel/sched/core.c:6525
preempt_schedule_irq+0xb1/0x150 kernel/sched/core.c:6873
irqentry_exit+0x63/0x70 kernel/entry/common.c:439
asm_sysvec_reschedule_ipi+0x16/0x20 arch/x86/include/asm/idtentry.h:696
RIP: 0010:filemap_get_pages mm/filemap.c:2667 [inline]
RIP: 0010:filemap_read+0x602/0x2f80 mm/filemap.c:2759
Code: 00 00 00 48 8b bc 24 10 01 00 00 31 f6 e8 a6 5e 26 00 48 8d bc 24 c0 01 00 00 48 8b b4 24 30 01 00 00 e8 a1 f9 02 00 4c 89 f7 <4c> 89 ee 48 8b 94 24 90 00 00 00 48 8d 8c 24 20 02 00 00 e8 46 b4
RSP: 0018:ffffc900033e6920 EFLAGS: 00000286
RAX: 0000000000400040 RBX: 0000000000000000 RCX: 1ffff9200067ccfc
RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffff88807837d598
RBP: ffffc900033e6c30 R08: dffffc0000000000 R09: ffffed100f06fabf
R10: ffffed100f06fabf R11: 1ffff1100f06fabe R12: dffffc0000000000
R13: 0000000000000000 R14: ffff88807837d598 R15: 0000000000000000
generic_file_read_iter+0x115/0x670 mm/filemap.c:2914
__kernel_read+0x2dc/0x6b0 fs/read_write.c:428
integrity_kernel_read+0x86/0xd0 security/integrity/iint.c:228
ima_calc_file_hash_tfm security/integrity/ima/ima_crypto.c:485 [inline]
ima_calc_file_shash security/integrity/ima/ima_crypto.c:516 [inline]
ima_calc_file_hash+0x96b/0x17c0 security/integrity/ima/ima_crypto.c:573
ima_collect_measurement+0x4b3/0xac0 security/integrity/ima/ima_api.c:293
process_measurement+0xfae/0x1a10 security/integrity/ima/ima_main.c:351
ima_file_check+0xc2/0x100 security/integrity/ima/ima_main.c:534
do_open fs/namei.c:3628 [inline]
path_openat+0x2679/0x2e70 fs/namei.c:3783
do_filp_open+0x1c1/0x3c0 fs/namei.c:3810
do_sys_openat2+0x142/0x490 fs/open.c:1318
do_sys_open fs/open.c:1334 [inline]
__do_sys_openat fs/open.c:1350 [inline]
__se_sys_openat fs/open.c:1345 [inline]
__x64_sys_openat+0x135/0x160 fs/open.c:1345
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fe4ec98e929
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:00007fe4ec7ff038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007fe4ecbb6080 RCX: 00007fe4ec98e929
RDX: 0000000000143042 RSI: 00002000000000c0 RDI: ffffffffffffff9c
RBP: 00007fe4eca10b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fe4ecbb6080 R15: 00007ffc71b05948
</TASK>
Allocated by task 2:
kasan_save_stack mm/kasan/common.c:45 [inline]
kasan_set_track+0x4b/0x70 mm/kasan/common.c:52
__kasan_slab_alloc+0x6b/0x80 mm/kasan/common.c:328
kasan_slab_alloc include/linux/kasan.h:201 [inline]
slab_post_alloc_hook+0x4b/0x480 mm/slab.h:737
slab_alloc_node mm/slub.c:3398 [inline]
kmem_cache_alloc_node+0x14d/0x320 mm/slub.c:3443
alloc_task_struct_node kernel/fork.c:172 [inline]
dup_task_struct+0x57/0x6b0 kernel/fork.c:981
copy_process+0x5bd/0x4020 kernel/fork.c:2181
kernel_clone+0x225/0x8b0 kernel/fork.c:2757
kernel_thread+0xe5/0x140 kernel/fork.c:2817
create_kthread kernel/kthread.c:399 [inline]
kthreadd+0x536/0x6e0 kernel/kthread.c:748
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
Last potentially related work creation:
kasan_save_stack+0x3a/0x60 mm/kasan/common.c:45
__kasan_record_aux_stack+0xb2/0xc0 mm/kasan/generic.c:486
call_rcu+0x14b/0x970 kernel/rcu/tree.c:2845
put_task_struct_rcu_user kernel/exit.c:231 [inline]
release_task+0x14ad/0x1600 kernel/exit.c:281
wait_task_zombie kernel/exit.c:1208 [inline]
wait_consider_task+0x1978/0x2e40 kernel/exit.c:1435
do_wait_thread kernel/exit.c:1498 [inline]
do_wait+0x31c/0xb60 kernel/exit.c:1615
kernel_wait4+0x1ab/0x270 kernel/exit.c:1778
__do_sys_wait4 kernel/exit.c:1806 [inline]
__se_sys_wait4 kernel/exit.c:1802 [inline]
__x64_sys_wait4+0x130/0x1e0 kernel/exit.c:1802
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
Second to last potentially related work creation:
kasan_save_stack+0x3a/0x60 mm/kasan/common.c:45
__kasan_record_aux_stack+0xb2/0xc0 mm/kasan/generic.c:486
call_rcu+0x14b/0x970 kernel/rcu/tree.c:2845
put_task_struct_rcu_user kernel/exit.c:231 [inline]
release_task+0x14ad/0x1600 kernel/exit.c:281
wait_task_zombie kernel/exit.c:1208 [inline]
wait_consider_task+0x1978/0x2e40 kernel/exit.c:1435
do_wait_thread kernel/exit.c:1498 [inline]
do_wait+0x31c/0xb60 kernel/exit.c:1615
kernel_wait4+0x1ab/0x270 kernel/exit.c:1778
__do_sys_wait4 kernel/exit.c:1806 [inline]
__se_sys_wait4 kernel/exit.c:1802 [inline]
__x64_sys_wait4+0x130/0x1e0 kernel/exit.c:1802
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
The buggy address belongs to the object at ffff888044c10000
which belongs to the cache task_struct of size 7360
The buggy address is located 255 bytes to the right of
7360-byte region [ffff888044c10000, ffff888044c11cc0)
The buggy address belongs to the physical page:
page:ffffea0001130400 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x44c10
head:ffffea0001130400 order:3 compound_mapcount:0 compound_pincount:0
memcg:ffff8880297b1f41
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 dead000000000100 dead000000000122 ffff888140008500
raw: 0000000000000000 0000000080040004 00000001ffffffff ffff8880297b1f41
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1, tgid 1 (init), ts 14388108998, free_ts 11242467742
set_page_owner include/linux/page_owner.h:31 [inline]
post_alloc_hook+0x173/0x1a0 mm/page_alloc.c:2532
prep_new_page mm/page_alloc.c:2539 [inline]
get_page_from_freelist+0x1a26/0x1ac0 mm/page_alloc.c:4328
__alloc_pages+0x1df/0x4e0 mm/page_alloc.c:5614
alloc_slab_page+0x5d/0x160 mm/slub.c:1794
allocate_slab mm/slub.c:1939 [inline]
new_slab+0x87/0x2c0 mm/slub.c:1992
___slab_alloc+0xbc6/0x1220 mm/slub.c:3180
__slab_alloc mm/slub.c:3279 [inline]
slab_alloc_node mm/slub.c:3364 [inline]
kmem_cache_alloc_node+0x1e5/0x320 mm/slub.c:3443
alloc_task_struct_node kernel/fork.c:172 [inline]
dup_task_struct+0x57/0x6b0 kernel/fork.c:981
copy_process+0x5bd/0x4020 kernel/fork.c:2181
kernel_clone+0x225/0x8b0 kernel/fork.c:2757
__ia32_sys_vfork+0xa9/0x100 kernel/fork.c:2860
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
page last free stack trace:
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1459 [inline]
free_pcp_prepare mm/page_alloc.c:1509 [inline]
free_unref_page_prepare+0x8b4/0x9a0 mm/page_alloc.c:3384
free_unref_page+0x2e/0x3f0 mm/page_alloc.c:3479
free_contig_range+0x9d/0x150 mm/page_alloc.c:9574
destroy_args+0xef/0x8bf mm/debug_vm_pgtable.c:1031
debug_vm_pgtable+0x32a/0x37e mm/debug_vm_pgtable.c:1354
do_one_initcall+0x214/0x7a0 init/main.c:1298
do_initcall_level+0x137/0x1e4 init/main.c:1371
do_initcalls+0x4b/0x8a init/main.c:1387
kernel_init_freeable+0x3fa/0x5ac init/main.c:1626
kernel_init+0x19/0x1b0 init/main.c:1514
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
Memory state around the buggy address:
ffff888044c11c80: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc
ffff888044c11d00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888044c11d80: fc fc fc fc fc fc fc fc 00 00 00 00 00 00 00 00
^
ffff888044c11e00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff888044c11e80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================
----------------
Code disassembly (best guess):
0: 00 00 add %al,(%rax)
2: 00 48 8b add %cl,-0x75(%rax)
5: bc 24 10 01 00 mov $0x11024,%esp
a: 00 31 add %dh,(%rcx)
c: f6 e8 imul %al
e: a6 cmpsb %es:(%rdi),%ds:(%rsi)
f: 5e pop %rsi
10: 26 00 48 8d es add %cl,-0x73(%rax)
14: bc 24 c0 01 00 mov $0x1c024,%esp
19: 00 48 8b add %cl,-0x75(%rax)
1c: b4 24 mov $0x24,%ah
1e: 30 01 xor %al,(%rcx)
20: 00 00 add %al,(%rax)
22: e8 a1 f9 02 00 call 0x2f9c8
27: 4c 89 f7 mov %r14,%rdi
* 2a: 4c 89 ee mov %r13,%rsi <-- trapping instruction
2d: 48 8b 94 24 90 00 00 mov 0x90(%rsp),%rdx
34: 00
35: 48 8d 8c 24 20 02 00 lea 0x220(%rsp),%rcx
3c: 00
3d: e8 .byte 0xe8
3e: 46 rex.RX
3f: b4 .byte 0xb4