================================================================== BUG: KASAN: stack-out-of-bounds in native_save_fl arch/x86/include/asm/irqflags.h:19 [inline] BUG: KASAN: stack-out-of-bounds in arch_local_save_flags arch/x86/include/asm/irqflags.h:109 [inline] BUG: KASAN: stack-out-of-bounds in arch_irqs_disabled arch/x86/include/asm/irqflags.h:151 [inline] BUG: KASAN: stack-out-of-bounds in preempt_schedule_irq+0x10d/0x1c0 kernel/sched/core.c:7091 Write of size 8 at addr ffffc90004db6380 by task syz.3.172/6997 CPU: 1 UID: 0 PID: 6997 Comm: syz.3.172 Not tainted 6.14.0-next-20250404-syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:408 [inline] print_report+0x16e/0x5b0 mm/kasan/report.c:521 kasan_report+0x143/0x180 mm/kasan/report.c:634 native_save_fl arch/x86/include/asm/irqflags.h:19 [inline] arch_local_save_flags arch/x86/include/asm/irqflags.h:109 [inline] arch_irqs_disabled arch/x86/include/asm/irqflags.h:151 [inline] preempt_schedule_irq+0x10d/0x1c0 kernel/sched/core.c:7091 irqentry_exit+0x5e/0x90 kernel/entry/common.c:354 asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:707 RIP: 0010:xas_load+0xd/0x5c0 lib/xarray.c:238 Code: 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 55 41 57 41 56 41 55 41 54 <53> 48 83 ec 48 49 89 fc 48 bd 00 00 00 00 00 fc ff df e8 cc a1 94 RSP: 0018:ffffc90004db64d0 EFLAGS: 00000287 RAX: ffffffff81fedbf2 RBX: ffffc90004db6580 RCX: 0000000000080000 RDX: ffffc9000d5ae000 RSI: 0000000000001020 RDI: ffffc90004db6580 RBP: ffffc90004db6630 R08: ffffffff81fedbd6 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: dffffc0000000000 R13: ffffc90004db6580 R14: 1ffff920009b6cac R15: ffffffff81fedba5 filemap_get_read_batch+0x242/0x960 mm/filemap.c:2361 filemap_get_pages+0x60c/0x1fc0 mm/filemap.c:2593 filemap_read+0x466/0x1260 mm/filemap.c:2701 __kernel_read+0x532/0xa10 fs/read_write.c:528 integrity_kernel_read+0xb2/0x100 security/integrity/iint.c:28 ima_calc_file_hash_tfm security/integrity/ima/ima_crypto.c:480 [inline] ima_calc_file_shash security/integrity/ima/ima_crypto.c:511 [inline] ima_calc_file_hash+0xb22/0x1c10 security/integrity/ima/ima_crypto.c:568 ima_collect_measurement+0x52b/0xb20 security/integrity/ima/ima_api.c:293 process_measurement+0x13a3/0x1fe0 security/integrity/ima/ima_main.c:383 ima_file_check+0xdb/0x130 security/integrity/ima/ima_main.c:611 security_file_post_open+0xb9/0x280 security/security.c:3130 do_open fs/namei.c:3847 [inline] path_openat+0x2cf7/0x35d0 fs/namei.c:4004 do_filp_open+0x284/0x4e0 fs/namei.c:4031 do_sys_openat2+0x12b/0x1d0 fs/open.c:1429 do_sys_open fs/open.c:1444 [inline] __do_sys_openat fs/open.c:1460 [inline] __se_sys_openat fs/open.c:1455 [inline] __x64_sys_openat+0x249/0x2a0 fs/open.c:1455 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fbf8ad8d169 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:00007fbf88bd5038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007fbf8afa6080 RCX: 00007fbf8ad8d169 RDX: 0000000000000042 RSI: 0000200000000040 RDI: ffffffffffffff9c RBP: 00007fbf8ae0e2a0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fbf8afa6080 R15: 00007ffe61db2558 The buggy address belongs to stack of task syz.3.172/6997 and is located at offset 32 in frame: preempt_schedule_irq+0x0/0x1c0 arch/x86/include/asm/bitops.h:-1 This frame has 2 objects: [32, 40) 'flags.i.i.i' [64, 72) 'flags.i.i' The buggy address belongs to the virtual mapping at [ffffc90004db0000, ffffc90004db9000) created by: copy_process+0x5dc/0x3d10 kernel/fork.c:2259 The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x36 pfn:0x51784 memcg:ffff88802f1c8e02 flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000000 0000000000000000 dead000000000122 0000000000000000 raw: 0000000000000036 0000000000000000 00000001ffffffff ffff88802f1c8e02 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_ZERO|__GFP_NOWARN), pid 6870, tgid 6870 (dhcpcd-run-hook), ts 184650699844, free_ts 184571613308 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f4/0x240 mm/page_alloc.c:1718 prep_new_page mm/page_alloc.c:1726 [inline] get_page_from_freelist+0x356d/0x3700 mm/page_alloc.c:3655 __alloc_frozen_pages_noprof+0x211/0x5b0 mm/page_alloc.c:4937 alloc_pages_mpol+0x339/0x690 mm/mempolicy.c:2302 alloc_frozen_pages_noprof mm/mempolicy.c:2373 [inline] alloc_pages_noprof+0x121/0x190 mm/mempolicy.c:2393 vm_area_alloc_pages mm/vmalloc.c:3591 [inline] __vmalloc_area_node mm/vmalloc.c:3669 [inline] __vmalloc_node_range_noprof+0x9cb/0x1390 mm/vmalloc.c:3844 __vmalloc_node_noprof+0x80/0xa0 mm/vmalloc.c:3907 alloc_thread_stack_node kernel/fork.c:314 [inline] dup_task_struct+0x3f7/0x870 kernel/fork.c:1136 copy_process+0x5dc/0x3d10 kernel/fork.c:2259 kernel_clone+0x242/0x930 kernel/fork.c:2844 __do_sys_clone kernel/fork.c:2987 [inline] __se_sys_clone kernel/fork.c:2971 [inline] __x64_sys_clone+0x268/0x2e0 kernel/fork.c:2971 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f page last free pid 6790 tgid 6789 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1262 [inline] free_unref_folios+0xe0e/0x17f0 mm/page_alloc.c:2739 folios_put_refs+0x70a/0x800 mm/swap.c:992 folio_batch_release include/linux/pagevec.h:101 [inline] truncate_inode_pages_range+0x462/0x10e0 mm/truncate.c:379 kill_bdev block/bdev.c:91 [inline] blkdev_flush_mapping+0x108/0x270 block/bdev.c:674 blkdev_put_whole block/bdev.c:681 [inline] bdev_release+0x460/0x700 block/bdev.c:1106 blkdev_release+0x15/0x20 block/fops.c:660 __fput+0x3e9/0x9f0 fs/file_table.c:465 task_work_run+0x251/0x310 kernel/task_work.c:227 get_signal+0x15db/0x1730 kernel/signal.c:2807 arch_do_signal_or_restart+0x98/0x840 arch/x86/kernel/signal.c:337 exit_to_user_mode_loop kernel/entry/common.c:111 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0xce/0x340 kernel/entry/common.c:218 do_syscall_64+0x100/0x230 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f Memory state around the buggy address: ffffc90004db6280: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffffc90004db6300: 00 00 00 00 00 00 00 00 00 00 00 00 f1 f1 f1 f1 >ffffc90004db6380: 00 f2 f2 f2 00 f3 f3 f3 00 00 00 00 00 00 00 00 ^ ffffc90004db6400: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffffc90004db6480: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ================================================================== ---------------- Code disassembly (best guess): 0: 2e 0f 1f 84 00 00 00 cs nopl 0x0(%rax,%rax,1) 7: 00 00 9: 0f 1f 40 00 nopl 0x0(%rax) d: 90 nop e: 90 nop f: 90 nop 10: 90 nop 11: 90 nop 12: 90 nop 13: 90 nop 14: 90 nop 15: 90 nop 16: 90 nop 17: 90 nop 18: 90 nop 19: 90 nop 1a: 90 nop 1b: 90 nop 1c: 90 nop 1d: f3 0f 1e fa endbr64 21: 55 push %rbp 22: 41 57 push %r15 24: 41 56 push %r14 26: 41 55 push %r13 28: 41 54 push %r12 * 2a: 53 push %rbx <-- trapping instruction 2b: 48 83 ec 48 sub $0x48,%rsp 2f: 49 89 fc mov %rdi,%r12 32: 48 bd 00 00 00 00 00 movabs $0xdffffc0000000000,%rbp 39: fc ff df 3c: e8 .byte 0xe8 3d: cc int3 3e: a1 .byte 0xa1 3f: 94 xchg %eax,%esp