================================================================== BUG: KASAN: use-after-free in __lock_acquire+0x3c2f/0x5470 kernel/locking/lockdep.c:4897 Read of size 8 at addr ffff888054244540 by task syz-executor.1/18197 CPU: 1 PID: 18197 Comm: syz-executor.1 Not tainted 5.16.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 print_address_description.constprop.0.cold+0x8d/0x320 mm/kasan/report.c:255 __kasan_report mm/kasan/report.c:442 [inline] kasan_report.cold+0x83/0xdf mm/kasan/report.c:459 __lock_acquire+0x3c2f/0x5470 kernel/locking/lockdep.c:4897 lock_acquire kernel/locking/lockdep.c:5637 [inline] lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5602 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x39/0x50 kernel/locking/spinlock.c:162 remove_wait_queue+0x1d/0x180 kernel/sched/wait.c:55 ep_remove_wait_queue+0x88/0x1a0 fs/eventpoll.c:545 ep_unregister_pollwait fs/eventpoll.c:561 [inline] ep_remove+0x106/0x9c0 fs/eventpoll.c:690 eventpoll_release_file+0xe1/0x130 fs/eventpoll.c:923 eventpoll_release include/linux/eventpoll.h:53 [inline] __fput+0x87b/0x9f0 fs/file_table.c:271 task_work_run+0xdd/0x1a0 kernel/task_work.c:164 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop kernel/entry/common.c:175 [inline] exit_to_user_mode_prepare+0x27e/0x290 kernel/entry/common.c:207 __syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline] syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:300 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f045c857afb Code: 0f 05 48 3d 00 f0 ff ff 77 45 c3 0f 1f 40 00 48 83 ec 18 89 7c 24 0c e8 63 fc ff ff 8b 7c 24 0c 41 89 c0 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 35 44 89 c7 89 44 24 0c e8 a1 fc ff ff 8b 44 RSP: 002b:00007ffc5d25e150 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000005 RCX: 00007f045c857afb RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000004 RBP: 00007f045c9b9960 R08: 0000000000000000 R09: 00007f045c9bc358 R10: 0000000000000000 R11: 0000000000000293 R12: 000000000009439b R13: 00007ffc5d25e250 R14: 00007f045c9b8030 R15: 0000000000000032 Allocated by task 18199: kasan_save_stack+0x1e/0x50 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:437 [inline] ____kasan_kmalloc mm/kasan/common.c:516 [inline] ____kasan_kmalloc mm/kasan/common.c:475 [inline] __kasan_kmalloc+0xa9/0xd0 mm/kasan/common.c:525 kmalloc include/linux/slab.h:582 [inline] psi_trigger_create.part.0+0x15e/0x7f0 kernel/sched/psi.c:1141 cgroup_pressure_write+0x17e/0x6e0 kernel/cgroup/cgroup.c:3647 cgroup_file_write+0x1de/0x760 kernel/cgroup/cgroup.c:3877 kernfs_fop_write_iter+0x342/0x500 fs/kernfs/file.c:296 call_write_iter include/linux/fs.h:2162 [inline] new_sync_write+0x429/0x660 fs/read_write.c:503 vfs_write+0x7cd/0xae0 fs/read_write.c:590 ksys_write+0x12d/0x250 fs/read_write.c:643 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae Freed by task 18199: kasan_save_stack+0x1e/0x50 mm/kasan/common.c:38 kasan_set_track+0x21/0x30 mm/kasan/common.c:46 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:370 ____kasan_slab_free mm/kasan/common.c:367 [inline] ____kasan_slab_free+0x130/0x160 mm/kasan/common.c:329 kasan_slab_free include/linux/kasan.h:236 [inline] slab_free_hook mm/slub.c:1728 [inline] slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1754 slab_free mm/slub.c:3509 [inline] kfree+0xcb/0x280 mm/slub.c:4562 cgroup_pressure_write+0x1b3/0x6e0 kernel/cgroup/cgroup.c:3653 cgroup_file_write+0x1de/0x760 kernel/cgroup/cgroup.c:3877 kernfs_fop_write_iter+0x342/0x500 fs/kernfs/file.c:296 call_write_iter include/linux/fs.h:2162 [inline] new_sync_write+0x429/0x660 fs/read_write.c:503 vfs_write+0x7cd/0xae0 fs/read_write.c:590 ksys_write+0x12d/0x250 fs/read_write.c:643 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae Last potentially related work creation: kasan_save_stack+0x1e/0x50 mm/kasan/common.c:38 __kasan_record_aux_stack+0xbe/0xd0 mm/kasan/generic.c:348 __call_rcu kernel/rcu/tree.c:2985 [inline] call_rcu+0xb1/0x740 kernel/rcu/tree.c:3065 neigh_parms_release net/core/neighbour.c:1706 [inline] neigh_parms_release+0x205/0x290 net/core/neighbour.c:1697 inetdev_destroy net/ipv4/devinet.c:327 [inline] inetdev_event+0xd30/0x15d0 net/ipv4/devinet.c:1600 notifier_call_chain+0xb5/0x200 kernel/notifier.c:84 call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:1919 call_netdevice_notifiers_extack net/core/dev.c:1931 [inline] call_netdevice_notifiers net/core/dev.c:1945 [inline] unregister_netdevice_many+0x964/0x1850 net/core/dev.c:10409 ip_tunnel_delete_nets+0x39f/0x5b0 net/ipv4/ip_tunnel.c:1123 ops_exit_list+0x10d/0x160 net/core/net_namespace.c:171 cleanup_net+0x4ea/0xb00 net/core/net_namespace.c:595 process_one_work+0x9b2/0x1660 kernel/workqueue.c:2298 worker_thread+0x65d/0x1130 kernel/workqueue.c:2445 kthread+0x405/0x4f0 kernel/kthread.c:327 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Second to last potentially related work creation: kasan_save_stack+0x1e/0x50 mm/kasan/common.c:38 __kasan_record_aux_stack+0xbe/0xd0 mm/kasan/generic.c:348 __call_rcu kernel/rcu/tree.c:2985 [inline] call_rcu+0xb1/0x740 kernel/rcu/tree.c:3065 neigh_parms_release net/core/neighbour.c:1706 [inline] neigh_parms_release+0x205/0x290 net/core/neighbour.c:1697 addrconf_ifdown.isra.0+0x1003/0x1630 net/ipv6/addrconf.c:3871 addrconf_notify+0xeb/0x1ba0 net/ipv6/addrconf.c:3651 notifier_call_chain+0xb5/0x200 kernel/notifier.c:84 call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:1919 call_netdevice_notifiers_extack net/core/dev.c:1931 [inline] call_netdevice_notifiers net/core/dev.c:1945 [inline] unregister_netdevice_many+0x964/0x1850 net/core/dev.c:10409 vti6_exit_batch_net+0x3a0/0x670 net/ipv6/ip6_vti.c:1190 ops_exit_list+0x10d/0x160 net/core/net_namespace.c:171 cleanup_net+0x4ea/0xb00 net/core/net_namespace.c:595 process_one_work+0x9b2/0x1660 kernel/workqueue.c:2298 worker_thread+0x65d/0x1130 kernel/workqueue.c:2445 kthread+0x405/0x4f0 kernel/kthread.c:327 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 The buggy address belongs to the object at ffff888054244500 which belongs to the cache kmalloc-192 of size 192 The buggy address is located 64 bytes inside of 192-byte region [ffff888054244500, ffff8880542445c0) The buggy address belongs to the page: page:ffffea0001509100 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888054244e00 pfn:0x54244 flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000200 ffffea0000646f48 ffffea0001c7b8c8 ffff888010c41a00 raw: ffff888054244e00 000000000010000e 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x112800(GFP_NOWAIT|__GFP_NOWARN|__GFP_NORETRY|__GFP_HARDWALL), pid 12691, ts 454704641035, free_ts 454701046557 prep_new_page mm/page_alloc.c:2418 [inline] get_page_from_freelist+0xa72/0x2f50 mm/page_alloc.c:4149 __alloc_pages+0x1b2/0x500 mm/page_alloc.c:5369 __alloc_pages_node include/linux/gfp.h:570 [inline] alloc_slab_page mm/slub.c:1801 [inline] allocate_slab mm/slub.c:1944 [inline] new_slab+0xab/0x3b0 mm/slub.c:2004 ___slab_alloc+0x87c/0xe90 mm/slub.c:3018 __slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3105 slab_alloc_node mm/slub.c:3196 [inline] __kmalloc_node+0x2cb/0x390 mm/slub.c:4468 kmalloc_array_node include/linux/slab.h:678 [inline] kcalloc_node include/linux/slab.h:683 [inline] memcg_alloc_slab_cgroups+0x8b/0x140 mm/memcontrol.c:2827 memcg_slab_post_alloc_hook+0xa7/0x450 mm/slab.h:522 slab_post_alloc_hook mm/slab.h:745 [inline] slab_alloc_node mm/slub.c:3230 [inline] slab_alloc mm/slub.c:3238 [inline] kmem_cache_alloc+0x15c/0x3a0 mm/slub.c:3243 xas_alloc+0x330/0x440 lib/xarray.c:374 xas_create+0x2d0/0x1070 lib/xarray.c:676 xas_create_range+0x246/0x6e0 lib/xarray.c:716 shmem_add_to_page_cache+0xbf2/0x15d0 mm/shmem.c:729 shmem_getpage_gfp+0x838/0x22d0 mm/shmem.c:1936 shmem_fault+0x1b4/0x750 mm/shmem.c:2114 __do_fault+0x10d/0x4d0 mm/memory.c:3849 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1338 [inline] free_pcp_prepare+0x374/0x870 mm/page_alloc.c:1389 free_unref_page_prepare mm/page_alloc.c:3309 [inline] free_unref_page+0x19/0x690 mm/page_alloc.c:3388 __vunmap+0x781/0xb70 mm/vmalloc.c:2632 __vfree+0x3c/0xd0 mm/vmalloc.c:2680 vfree+0x5a/0x90 mm/vmalloc.c:2711 netlink_skb_destructor+0xc2/0x210 net/netlink/af_netlink.c:377 skb_release_head_state+0x9f/0x2a0 net/core/skbuff.c:729 skb_release_all net/core/skbuff.c:740 [inline] __kfree_skb net/core/skbuff.c:756 [inline] consume_skb net/core/skbuff.c:914 [inline] consume_skb+0x89/0x160 net/core/skbuff.c:908 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x541/0x7e0 net/netlink/af_netlink.c:1343 netlink_sendmsg+0x904/0xe00 net/netlink/af_netlink.c:1919 sock_sendmsg_nosec net/socket.c:705 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:725 sock_no_sendpage+0xf6/0x140 net/core/sock.c:3086 kernel_sendpage.part.0+0x1a0/0x340 net/socket.c:3492 kernel_sendpage net/socket.c:3489 [inline] sock_sendpage+0xe5/0x140 net/socket.c:1007 pipe_to_sendpage+0x2ad/0x380 fs/splice.c:364 splice_from_pipe_feed fs/splice.c:418 [inline] __splice_from_pipe+0x43e/0x8a0 fs/splice.c:562 Memory state around the buggy address: ffff888054244400: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888054244480: 04 fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff888054244500: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888054244580: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff888054244600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================