================================================================== 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 ffff88802eefd93f by task syz.4.573/6699 CPU: 1 PID: 6699 Comm: syz.4.573 Not tainted 6.1.141-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Call Trace: 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 e6 5d 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:ffffc90004c5e920 EFLAGS: 00000286 RAX: 0000000000400040 RBX: 0000000000000000 RCX: 1ffff9200098bcfc RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffff888071a5ce38 RBP: ffffc90004c5ec30 R08: dffffc0000000000 R09: ffffed100e34b9d3 R10: ffffed100e34b9d3 R11: 1ffff1100e34b9d2 R12: dffffc0000000000 R13: 0000000000000000 R14: ffff888071a5ce38 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: 0033:0x7f89f2b8e929 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:00007f89f3977038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007f89f2db6160 RCX: 00007f89f2b8e929 RDX: 0000000000143042 RSI: 00002000000000c0 RDI: ffffffffffffff9c RBP: 00007f89f2c10b39 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f89f2db6160 R15: 00007ffd1ae1c3d8 Allocated by task 6406: 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 __do_sys_clone3 kernel/fork.c:3056 [inline] __se_sys_clone3+0x2dc/0x360 kernel/fork.c:3040 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 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 context_switch kernel/sched/core.c:5247 [inline] __schedule+0x10f1/0x40d0 kernel/sched/core.c:6561 schedule+0xb9/0x180 kernel/sched/core.c:6637 futex_wait_queue+0x134/0x1b0 kernel/futex/waitwake.c:355 futex_wait+0x19b/0x530 kernel/futex/waitwake.c:656 do_futex+0x310/0x320 kernel/futex/syscalls.c:106 __do_sys_futex kernel/futex/syscalls.c:183 [inline] __se_sys_futex+0x14a/0x440 kernel/futex/syscalls.c:164 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 context_switch kernel/sched/core.c:5247 [inline] __schedule+0x10f1/0x40d0 kernel/sched/core.c:6561 preempt_schedule_common+0x82/0xd0 kernel/sched/core.c:6730 preempt_schedule+0xa7/0xb0 kernel/sched/core.c:6754 preempt_schedule_thunk+0x16/0x18 arch/x86/entry/thunk_64.S:34 __raw_spin_unlock include/linux/spinlock_api_smp.h:143 [inline] _raw_spin_unlock+0x36/0x40 kernel/locking/spinlock.c:186 spin_unlock include/linux/spinlock.h:391 [inline] filemap_remove_folio+0x1aa/0x2c0 mm/filemap.c:259 truncate_inode_folio+0x59/0x70 mm/truncate.c:195 shmem_undo_range+0x4d2/0x2050 mm/shmem.c:942 shmem_truncate_range mm/shmem.c:1062 [inline] shmem_evict_inode+0x248/0xa40 mm/shmem.c:1171 evict+0x485/0x870 fs/inode.c:705 __dentry_kill+0x431/0x650 fs/dcache.c:611 dentry_kill+0xb8/0x290 fs/dcache.c:-1 dput+0xfa/0x1d0 fs/dcache.c:918 __fput+0x5e0/0x920 fs/file_table.c:328 task_work_run+0x1ca/0x250 kernel/task_work.c:203 exit_task_work include/linux/task_work.h:39 [inline] do_exit+0x936/0x2400 kernel/exit.c:871 do_group_exit+0x217/0x2d0 kernel/exit.c:1021 get_signal+0x1272/0x1350 kernel/signal.c:2871 arch_do_signal_or_restart+0xb0/0x1230 arch/x86/kernel/signal.c:871 exit_to_user_mode_loop+0x70/0x110 kernel/entry/common.c:174 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:210 __syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline] syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:303 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:87 entry_SYSCALL_64_after_hwframe+0x68/0xd2 The buggy address belongs to the object at ffff88802eefbb80 which belongs to the cache task_struct of size 7360 The buggy address is located 255 bytes to the right of 7360-byte region [ffff88802eefbb80, ffff88802eefd840) The buggy address belongs to the physical page: page:ffffea0000bbbe00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2eef8 head:ffffea0000bbbe00 order:3 compound_mapcount:0 compound_pincount:0 memcg:ffff888058fa0c41 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffffea0000b8d600 dead000000000002 ffff888140008500 raw: 0000000000000000 0000000080040004 00000001ffffffff ffff888058fa0c41 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 2, tgid 2 (kthreadd), ts 20087214904, free_ts 0 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_pages_node include/linux/gfp.h:237 [inline] alloc_slab_page+0x4f/0x160 mm/slub.c:1796 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 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 page_owner free stack trace missing Memory state around the buggy address: ffff88802eefd800: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff88802eefd880: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88802eefd900: fc fc fc fc fc fc fc fc 00 00 00 00 00 00 00 00 ^ ffff88802eefd980: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88802eefda00: 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: e6 5d out %al,$0x5d 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