================================================================== BUG: KASAN: use-after-free in __lock_acquire+0x74/0x1ff0 kernel/locking/lockdep.c:4882 Read of size 8 at addr ffff88801f02a7e8 by task syz-executor.0/24462 CPU: 0 PID: 24462 Comm: syz-executor.0 Not tainted 5.15.156-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2d0 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:1451 expire_timers kernel/time/timer.c:1496 [inline] __run_timers+0x67c/0x890 kernel/time/timer.c:1767 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1780 __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+0x43/0xb0 arch/x86/kernel/apic/apic.c:1096 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:638 RIP: 0033:0x7f740afe03e1 Code: 78 08 00 00 48 8b 80 70 08 00 00 48 39 f0 75 c9 c7 05 2b 04 c8 00 00 00 00 00 c3 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 55 <48> 89 fd 53 48 83 ec 18 80 3d 08 04 c8 00 00 0f 84 f2 01 00 00 48 RSP: 002b:00007ffefc0ddc80 EFLAGS: 00000287 RAX: 0000000000100000 RBX: 0000000000008000 RCX: 00007ffefc0ddcb0 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000008030 RBP: 0000000000000003 R08: 0000000000000000 R09: 0000000000000010 R10: 0000000000001000 R11: 0000000000000206 R12: 00007ffefc0deee0 R13: 00007f740b04f3b9 R14: 00000000000e2c9f R15: 0000000000000004 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:357 [inline] kthreadd+0x57a/0x740 kernel/kthread.c:701 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:300 Freed by task 20: 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:181 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:214 __syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline] syscall_exit_to_user_mode+0x5d/0x240 kernel/entry/common.c:307 do_syscall_64+0x47/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x66/0xd0 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 release_task+0x16b6/0x1750 wait_task_zombie kernel/exit.c:1179 [inline] wait_consider_task+0x1994/0x2e50 kernel/exit.c:1406 do_wait_thread kernel/exit.c:1469 [inline] do_wait+0x30c/0xaf0 kernel/exit.c:1586 kernel_wait4+0x29e/0x3e0 kernel/exit.c:1749 __do_sys_wait4 kernel/exit.c:1777 [inline] __se_sys_wait4 kernel/exit.c:1773 [inline] __x64_sys_wait4+0x130/0x1e0 kernel/exit.c:1773 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 The buggy address belongs to the object at ffff88801f029dc0 which belongs to the cache task_struct of size 7360 The buggy address is located 2600 bytes inside of 7360-byte region [ffff88801f029dc0, ffff88801f02ba80) The buggy address belongs to the page: page:ffffea00007c0a00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1f028 head:ffffea00007c0a00 order:3 compound_mapcount:0 compound_pincount:0 memcg:ffff88805e6ec381 flags: 0xfff80000010200(slab|head|node=0|zone=1|lastcpupid=0xfff) raw: 00fff80000010200 dead000000000100 dead000000000122 ffff888011deb3c0 raw: 0000000000000000 0000000000040004 00000001ffffffff ffff88805e6ec381 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 11489, ts 261217827602, free_ts 261206780223 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:5423 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 __do_sys_clone3 kernel/fork.c:2879 [inline] __se_sys_clone3+0x3e1/0x430 kernel/fork.c:2863 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 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 put_page include/linux/mm.h:1247 [inline] page_to_skb+0x84d/0xd20 drivers/net/virtio_net.c:509 receive_mergeable drivers/net/virtio_net.c:1070 [inline] receive_buf+0x1218/0x64c0 drivers/net/virtio_net.c:1180 virtnet_receive drivers/net/virtio_net.c:1472 [inline] virtnet_poll+0x629/0x1270 drivers/net/virtio_net.c:1585 __napi_poll+0xc7/0x440 net/core/dev.c:7035 napi_poll net/core/dev.c:7102 [inline] net_rx_action+0x617/0xda0 net/core/dev.c:7192 __do_softirq+0x3b3/0x93a kernel/softirq.c:558 run_ksoftirqd+0xc1/0x120 kernel/softirq.c:921 smpboot_thread_fn+0x51b/0x9d0 kernel/smpboot.c:164 kthread+0x3f6/0x4f0 kernel/kthread.c:334 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:300 Memory state around the buggy address: ffff88801f02a680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88801f02a700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88801f02a780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88801f02a800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88801f02a880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================