================================================================== BUG: KASAN: slab-use-after-free in __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:155 [inline] BUG: KASAN: slab-use-after-free in _raw_spin_lock_irqsave+0x40/0x60 kernel/locking/spinlock.c:181 Read of size 1 at addr ffff888025411418 by task syz.1.653/9122 CPU: 0 UID: 0 PID: 9122 Comm: syz.1.653 Not tainted syzkaller #0 PREEMPT_{RT,(full)} Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 print_address_description+0x55/0x1e0 mm/kasan/report.c:378 print_report+0x58/0x70 mm/kasan/report.c:482 kasan_report+0x117/0x150 mm/kasan/report.c:595 __kasan_check_byte+0x2a/0x40 mm/kasan/common.c:585 kasan_check_byte include/linux/kasan.h:402 [inline] lock_acquire+0x7d/0x350 kernel/locking/lockdep.c:5916 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:155 [inline] _raw_spin_lock_irqsave+0x40/0x60 kernel/locking/spinlock.c:181 rt_mutex_slowunlock+0xbf/0xa30 kernel/locking/rtmutex.c:1430 rt_spin_unlock+0x10f/0x200 kernel/locking/spinlock_rt.c:84 kbd_keycode drivers/tty/vt/keyboard.c:1574 [inline] kbd_event+0x2e8d/0x41f0 drivers/tty/vt/keyboard.c:1592 input_handle_events_default+0xd4/0x1a0 drivers/input/input.c:2614 input_pass_values+0x288/0x890 drivers/input/input.c:128 input_event_dispose+0x35f/0x700 drivers/input/input.c:342 input_inject_event+0x1fa/0x310 drivers/input/input.c:424 evdev_write+0x328/0x4c0 drivers/input/evdev.c:533 vfs_write+0x29f/0xbb0 fs/read_write.c:685 ksys_write+0x156/0x270 fs/read_write.c:739 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fd68965e159 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fd687895028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007fd6898e6090 RCX: 00007fd68965e159 RDX: 0000000000002250 RSI: 0000200000000040 RDI: 0000000000000003 RBP: 00007fd6896f506b R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fd6898e6128 R14: 00007fd6898e6090 R15: 00007ffcb437fc08 Allocated by task 9122: kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 poison_kmalloc_redzone mm/kasan/common.c:409 [inline] __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:426 kasan_kmalloc include/linux/kasan.h:263 [inline] __kmalloc_cache_noprof+0x3d5/0x680 mm/slub.c:5563 _kmalloc_noprof include/linux/slab.h:991 [inline] _kzalloc_noprof include/linux/slab.h:1312 [inline] alloc_tty_struct+0xa6/0x7a0 drivers/tty/tty_io.c:3075 tty_init_dev+0x59/0x4d0 drivers/tty/tty_io.c:1373 tty_open_by_driver drivers/tty/tty_io.c:2046 [inline] tty_open+0x7e5/0xcd0 drivers/tty/tty_io.c:2093 chrdev_open+0x4dc/0x600 fs/char_dev.c:411 do_dentry_open+0x849/0x1420 fs/open.c:996 vfs_open+0x3b/0x350 fs/open.c:1101 do_open fs/namei.c:4837 [inline] path_openat+0x1448/0x1d60 fs/namei.c:5000 do_file_open+0x23e/0x4a0 fs/namei.c:5029 do_sys_openat2+0x115/0x200 fs/open.c:1417 do_sys_open fs/open.c:1423 [inline] __do_sys_openat fs/open.c:1439 [inline] __se_sys_openat fs/open.c:1434 [inline] __x64_sys_openat+0x138/0x170 fs/open.c:1434 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 5598: kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:584 poison_slab_object mm/kasan/common.c:264 [inline] __kasan_slab_free+0x5c/0x80 mm/kasan/common.c:296 kasan_slab_free include/linux/kasan.h:235 [inline] slab_free_hook mm/slub.c:2748 [inline] slab_free mm/slub.c:6508 [inline] kfree+0x1c5/0x6d0 mm/slub.c:6801 process_one_work kernel/workqueue.c:3396 [inline] process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3479 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3560 kthread+0x38b/0x470 kernel/kthread.c:436 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Last potentially related work creation: kasan_save_stack+0x3e/0x60 mm/kasan/common.c:57 kasan_record_aux_stack+0xbd/0xd0 mm/kasan/generic.c:556 insert_work+0x3d/0x330 kernel/workqueue.c:2272 __queue_work+0xd4b/0x1120 kernel/workqueue.c:2448 queue_work_on+0x106/0x1d0 kernel/workqueue.c:2501 tty_release_struct+0xb8/0xd0 drivers/tty/tty_io.c:1665 tty_release+0xc6b/0x1680 drivers/tty/tty_io.c:1825 __fput+0x42a/0xa80 fs/file_table.c:512 task_work_run+0x1d9/0x270 kernel/task_work.c:233 exit_task_work include/linux/task_work.h:40 [inline] do_exit+0x73a/0x2360 kernel/exit.c:986 do_group_exit+0x22d/0x2f0 kernel/exit.c:1129 get_signal+0x121b/0x12c0 kernel/signal.c:3112 arch_do_signal_or_restart+0xbb/0x860 arch/x86/kernel/signal.c:337 __exit_to_user_mode_loop kernel/entry/common.c:66 [inline] exit_to_user_mode_loop+0x10e/0x770 kernel/entry/common.c:101 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline] syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:343 [inline] do_syscall_64+0x328/0x520 arch/x86/entry/syscall_64.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff888025411000 which belongs to the cache kmalloc-cg-2k of size 2048 The buggy address is located 1048 bytes inside of freed 2048-byte region [ffff888025411000, ffff888025411800) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff888025412000 pfn:0x25410 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 memcg:ffff888025410811 flags: 0x80000000000240(workingset|head|node=0|zone=1) page_type: f5(slab) raw: 0080000000000240 ffff88813ff073c0 ffffea0000f72810 ffffea0000e6a610 raw: ffff888025412000 0000000300080007 00000000f5000000 ffff888025410811 head: 0080000000000240 ffff88813ff073c0 ffffea0000f72810 ffffea0000e6a610 head: ffff888025412000 0000000300080007 00000000f5000000 ffff888025410811 head: 0080000000000003 fffffffffffffe01 00000000ffffffff 00000000ffffffff head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000008 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 6772, tgid 6771 (syz.1.203), ts 277452728686 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x1f9/0x250 mm/page_alloc.c:1871 prep_new_page mm/page_alloc.c:1879 [inline] get_page_from_freelist+0x2591/0x2600 mm/page_alloc.c:3943 __alloc_frozen_pages_noprof+0x230/0x5c0 mm/page_alloc.c:5436 alloc_slab_page mm/slub.c:3347 [inline] allocate_slab+0x7d/0x620 mm/slub.c:3462 new_slab mm/slub.c:3513 [inline] refill_objects+0x2d8/0x350 mm/slub.c:7417 refill_sheaf mm/slub.c:2885 [inline] __pcs_replace_empty_main+0x339/0x690 mm/slub.c:4774 alloc_from_pcs mm/slub.c:4850 [inline] slab_alloc_node mm/slub.c:4984 [inline] __kmalloc_cache_noprof+0x46f/0x680 mm/slub.c:5559 _kmalloc_noprof include/linux/slab.h:991 [inline] _kzalloc_noprof include/linux/slab.h:1312 [inline] bpf_prog_alloc_no_stats+0xd8/0x560 kernel/bpf/core.c:112 bpf_prog_alloc+0x3c/0x1a0 kernel/bpf/core.c:158 bpf_prog_load+0x7f8/0x1c20 kernel/bpf/syscall.c:3042 __sys_bpf+0xd0d/0xd90 kernel/bpf/syscall.c:6370 __do_sys_bpf kernel/bpf/syscall.c:6489 [inline] __se_sys_bpf kernel/bpf/syscall.c:6486 [inline] __x64_sys_bpf+0xba/0xd0 kernel/bpf/syscall.c:6486 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f page last free pid 6772 tgid 6771 ts 277452452119 stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] __free_pages_prepare mm/page_alloc.c:1418 [inline] __free_frozen_pages+0xf8e/0x1070 mm/page_alloc.c:2962 __slab_free+0x250/0x2a0 mm/slub.c:5823 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x99/0x100 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:361 kasan_slab_alloc include/linux/kasan.h:253 [inline] slab_post_alloc_hook mm/slub.c:4683 [inline] slab_alloc_node mm/slub.c:4996 [inline] __kmalloc_cache_node_noprof+0x3df/0x670 mm/slub.c:5578 _kmalloc_node_noprof include/linux/slab.h:1196 [inline] __get_vm_area_node+0x155/0x2f0 mm/vmalloc.c:3237 __vmalloc_node_range_noprof+0x343/0x1540 mm/vmalloc.c:4064 __vmalloc_node_noprof mm/vmalloc.c:4165 [inline] __vmalloc_noprof+0xd2/0x120 mm/vmalloc.c:4181 bpf_prog_alloc_no_stats+0x47/0x560 kernel/bpf/core.c:108 bpf_prog_alloc+0x3c/0x1a0 kernel/bpf/core.c:158 bpf_prog_load+0x7f8/0x1c20 kernel/bpf/syscall.c:3042 __sys_bpf+0xd0d/0xd90 kernel/bpf/syscall.c:6370 __do_sys_bpf kernel/bpf/syscall.c:6489 [inline] __se_sys_bpf kernel/bpf/syscall.c:6486 [inline] __x64_sys_bpf+0xba/0xd0 kernel/bpf/syscall.c:6486 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f Memory state around the buggy address: ffff888025411300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888025411380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888025411400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888025411480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888025411500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================