================================================================== BUG: KASAN: use-after-free in __lock_acquire+0x74/0x1ff0 kernel/locking/lockdep.c:4882 Read of size 8 at addr ffff88805eb7c5a8 by task kworker/1:13/8495 CPU: 1 PID: 8495 Comm: kworker/1:13 Not tainted 5.15.153-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 Workqueue: events pwq_unbound_release_workfn Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106 print_address_description+0x63/0x3b0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:434 [inline] kasan_report+0x16b/0x1c0 mm/kasan/report.c:451 __lock_acquire+0x74/0x1ff0 kernel/locking/lockdep.c:4882 lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0xd1/0x120 kernel/locking/spinlock.c:162 try_to_wake_up+0xae/0x1300 kernel/sched/core.c:4030 call_timer_fn+0x16d/0x560 kernel/time/timer.c:1421 expire_timers kernel/time/timer.c:1466 [inline] __run_timers+0x67c/0x890 kernel/time/timer.c:1737 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1750 __do_softirq+0x3b3/0x93a kernel/softirq.c:558 invoke_softirq kernel/softirq.c:432 [inline] __irq_exit_rcu+0x155/0x240 kernel/softirq.c:637 irq_exit_rcu+0x5/0x20 kernel/softirq.c:649 sysvec_apic_timer_interrupt+0x91/0xb0 arch/x86/kernel/apic/apic.c:1096 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:638 RIP: 0010:synchronize_rcu+0x0/0x1a0 kernel/rcu/tree.c:3790 Code: e8 95 d5 5e 00 e9 68 fd ff ff 48 c7 c7 e0 43 92 8c 48 89 de e8 01 0e be 02 e9 b5 fa ff ff e8 d7 d5 b0 08 0f 1f 80 00 00 00 00 <55> 48 89 e5 41 57 41 56 41 54 53 48 83 e4 e0 48 81 ec 00 01 00 00 RSP: 0018:ffffc90003797b38 EFLAGS: 00000206 RAX: dffffc0000000000 RBX: 1ffff920006f2f70 RCX: ffffffff913c7f03 RDX: 0000000000000000 RSI: ffffffff8a8b2300 RDI: ffffffff8ad88fc0 RBP: ffffc90003797c08 R08: dffffc0000000000 R09: fffffbfff2277a96 R10: 0000000000000000 R11: dffffc0000000001 R12: ffffffff913bb788 R13: 1ffff920006f2f6c R14: 0000000000000a03 R15: ffffc90003797b80 lockdep_unregister_key+0x4e6/0x5b0 kernel/locking/lockdep.c:6319 wq_unregister_lockdep kernel/workqueue.c:3518 [inline] pwq_unbound_release_workfn+0x23d/0x290 kernel/workqueue.c:3756 process_one_work+0x8a1/0x10c0 kernel/workqueue.c:2310 worker_thread+0xaca/0x1280 kernel/workqueue.c:2457 kthread+0x3f6/0x4f0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298 Allocated by task 2: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:434 [inline] __kasan_slab_alloc+0x8e/0xc0 mm/kasan/common.c:467 kasan_slab_alloc include/linux/kasan.h:254 [inline] slab_post_alloc_hook+0x53/0x380 mm/slab.h:519 slab_alloc_node mm/slub.c:3220 [inline] kmem_cache_alloc_node+0x121/0x2c0 mm/slub.c:3256 alloc_task_struct_node kernel/fork.c:171 [inline] dup_task_struct+0x57/0xb60 kernel/fork.c:894 copy_process+0x5eb/0x3ef0 kernel/fork.c:2038 kernel_clone+0x210/0x960 kernel/fork.c:2604 kernel_thread+0x168/0x1e0 kernel/fork.c:2656 create_kthread kernel/kthread.c:342 [inline] kthreadd+0x57a/0x740 kernel/kthread.c:686 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298 Freed by task 8637: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x4b/0x80 mm/kasan/common.c:46 kasan_set_free_info+0x1f/0x40 mm/kasan/generic.c:360 ____kasan_slab_free+0xd8/0x120 mm/kasan/common.c:366 kasan_slab_free include/linux/kasan.h:230 [inline] slab_free_hook mm/slub.c:1705 [inline] slab_free_freelist_hook+0xdd/0x160 mm/slub.c:1731 slab_free mm/slub.c:3499 [inline] kmem_cache_free+0x91/0x1f0 mm/slub.c:3515 rcu_do_batch kernel/rcu/tree.c:2523 [inline] rcu_core+0xa15/0x1650 kernel/rcu/tree.c:2763 __do_softirq+0x3b3/0x93a kernel/softirq.c:558 Last potentially related work creation: kasan_save_stack+0x36/0x60 mm/kasan/common.c:38 kasan_record_aux_stack+0xba/0x100 mm/kasan/generic.c:348 __call_rcu kernel/rcu/tree.c:3007 [inline] call_rcu+0x1c4/0xa70 kernel/rcu/tree.c:3087 context_switch kernel/sched/core.c:5033 [inline] __schedule+0x12cc/0x45b0 kernel/sched/core.c:6376 schedule+0x11b/0x1f0 kernel/sched/core.c:6459 nilfs_segctor_kill_thread fs/nilfs2/segment.c:2681 [inline] nilfs_segctor_destroy fs/nilfs2/segment.c:2763 [inline] nilfs_detach_log_writer+0x2e6/0xbd0 fs/nilfs2/segment.c:2852 nilfs_put_super+0x49/0x150 fs/nilfs2/super.c:498 generic_shutdown_super+0x136/0x2c0 fs/super.c:475 kill_block_super+0x7a/0xe0 fs/super.c:1414 deactivate_locked_super+0xa0/0x110 fs/super.c:335 cleanup_mnt+0x44e/0x500 fs/namespace.c:1143 task_work_run+0x129/0x1a0 kernel/task_work.c:164 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop+0x106/0x130 kernel/entry/common.c:175 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:208 __syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline] syscall_exit_to_user_mode+0x5d/0x250 kernel/entry/common.c:301 do_syscall_64+0x49/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x61/0xcb Second to last potentially related work creation: kasan_save_stack+0x36/0x60 mm/kasan/common.c:38 kasan_record_aux_stack+0xba/0x100 mm/kasan/generic.c:348 __call_rcu kernel/rcu/tree.c:3007 [inline] call_rcu+0x1c4/0xa70 kernel/rcu/tree.c:3087 context_switch kernel/sched/core.c:5033 [inline] __schedule+0x12cc/0x45b0 kernel/sched/core.c:6376 preempt_schedule_notrace+0xf8/0x140 kernel/sched/core.c:6631 preempt_schedule_notrace_thunk+0x16/0x18 arch/x86/entry/thunk_64.S:35 rcu_is_watching+0x72/0xa0 kernel/rcu/tree.c:1124 rcu_read_unlock include/linux/rcupdate.h:768 [inline] batadv_iv_ogm_slide_own_bcast_window net/batman-adv/bat_iv_ogm.c:772 [inline] batadv_iv_ogm_schedule_buff net/batman-adv/bat_iv_ogm.c:826 [inline] batadv_iv_ogm_schedule+0x652/0x1000 net/batman-adv/bat_iv_ogm.c:869 batadv_iv_send_outstanding_bat_ogm_packet+0x6fa/0x800 net/batman-adv/bat_iv_ogm.c:1713 process_one_work+0x8a1/0x10c0 kernel/workqueue.c:2310 worker_thread+0xaca/0x1280 kernel/workqueue.c:2457 kthread+0x3f6/0x4f0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298 The buggy address belongs to the object at ffff88805eb7bb80 which belongs to the cache task_struct of size 7360 The buggy address is located 2600 bytes inside of 7360-byte region [ffff88805eb7bb80, ffff88805eb7d840) The buggy address belongs to the page: page:ffffea00017ade00 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88805eb79dc0 pfn:0x5eb78 head:ffffea00017ade00 order:3 compound_mapcount:0 compound_pincount:0 memcg:ffff88801a199081 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffffea000091a608 ffffea00008c0808 ffff888011de93c0 raw: ffff88805eb79dc0 0000000000040002 00000001ffffffff ffff88801a199081 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 2, ts 369547206391, free_ts 366891675336 prep_new_page mm/page_alloc.c:2426 [inline] get_page_from_freelist+0x322a/0x33c0 mm/page_alloc.c:4159 __alloc_pages+0x272/0x700 mm/page_alloc.c:5421 alloc_slab_page mm/slub.c:1775 [inline] allocate_slab mm/slub.c:1912 [inline] new_slab+0xbb/0x4b0 mm/slub.c:1975 ___slab_alloc+0x6f6/0xe10 mm/slub.c:3008 __slab_alloc mm/slub.c:3095 [inline] slab_alloc_node mm/slub.c:3186 [inline] kmem_cache_alloc_node+0x1ba/0x2c0 mm/slub.c:3256 alloc_task_struct_node kernel/fork.c:171 [inline] dup_task_struct+0x57/0xb60 kernel/fork.c:894 copy_process+0x5eb/0x3ef0 kernel/fork.c:2038 kernel_clone+0x210/0x960 kernel/fork.c:2604 kernel_thread+0x168/0x1e0 kernel/fork.c:2656 create_kthread kernel/kthread.c:342 [inline] kthreadd+0x57a/0x740 kernel/kthread.c:686 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1340 [inline] free_pcp_prepare mm/page_alloc.c:1391 [inline] free_unref_page_prepare+0xc34/0xcf0 mm/page_alloc.c:3317 free_unref_page+0x95/0x2d0 mm/page_alloc.c:3396 do_slab_free mm/slub.c:3487 [inline] ___cache_free+0xe3/0x100 mm/slub.c:3506 qlist_free_all+0x36/0x90 mm/kasan/quarantine.c:176 kasan_quarantine_reduce+0x162/0x180 mm/kasan/quarantine.c:283 __kasan_slab_alloc+0x2f/0xc0 mm/kasan/common.c:444 kasan_slab_alloc include/linux/kasan.h:254 [inline] slab_post_alloc_hook+0x53/0x380 mm/slab.h:519 slab_alloc_node mm/slub.c:3220 [inline] slab_alloc mm/slub.c:3228 [inline] kmem_cache_alloc+0xf3/0x280 mm/slub.c:3233 getname_flags+0xb8/0x4e0 fs/namei.c:138 getname fs/namei.c:217 [inline] __do_sys_rmdir fs/namei.c:4229 [inline] __se_sys_rmdir fs/namei.c:4227 [inline] __x64_sys_rmdir+0x38/0x50 fs/namei.c:4227 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x61/0xcb Memory state around the buggy address: ffff88805eb7c480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88805eb7c500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88805eb7c580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88805eb7c600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88805eb7c680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== ---------------- Code disassembly (best guess): 0: e8 95 d5 5e 00 call 0x5ed59a 5: e9 68 fd ff ff jmp 0xfffffd72 a: 48 c7 c7 e0 43 92 8c mov $0xffffffff8c9243e0,%rdi 11: 48 89 de mov %rbx,%rsi 14: e8 01 0e be 02 call 0x2be0e1a 19: e9 b5 fa ff ff jmp 0xfffffad3 1e: e8 d7 d5 b0 08 call 0x8b0d5fa 23: 0f 1f 80 00 00 00 00 nopl 0x0(%rax) * 2a: 55 push %rbp <-- trapping instruction 2b: 48 89 e5 mov %rsp,%rbp 2e: 41 57 push %r15 30: 41 56 push %r14 32: 41 54 push %r12 34: 53 push %rbx 35: 48 83 e4 e0 and $0xffffffffffffffe0,%rsp 39: 48 81 ec 00 01 00 00 sub $0x100,%rsp