================================================================== BUG: KASAN: use-after-free in __lock_acquire+0x3c2f/0x5470 kernel/locking/lockdep.c:4897 Read of size 8 at addr ffff8880240a9040 by task syz-executor.1/20119 CPU: 1 PID: 20119 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_free+0x18a/0x390 fs/eventpoll.c:756 ep_eventpoll_release+0x41/0x60 fs/eventpoll.c:788 __fput+0x286/0x9f0 fs/file_table.c:280 task_work_run+0xdd/0x1a0 kernel/task_work.c:164 exit_task_work include/linux/task_work.h:32 [inline] do_exit+0xc14/0x2b40 kernel/exit.c:832 do_group_exit+0x125/0x310 kernel/exit.c:929 get_signal+0x47d/0x2220 kernel/signal.c:2852 arch_do_signal_or_restart+0x2a9/0x1c40 arch/x86/kernel/signal.c:868 handle_signal_work kernel/entry/common.c:148 [inline] exit_to_user_mode_loop kernel/entry/common.c:172 [inline] exit_to_user_mode_prepare+0x17d/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: 0033:0x7f861c621fe9 Code: Unable to access opcode bytes at RIP 0x7f861c621fbf. RSP: 002b:00007f861af55168 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: 000000000000002f RBX: 00007f861c735100 RCX: 00007f861c621fe9 RDX: 000000000000002f RSI: 0000000020001340 RDI: 0000000000000004 RBP: 00007f861c67c08d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffeeb4a09df R14: 00007f861af55300 R15: 0000000000022000 Allocated by task 20116: 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 20119: 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 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 ip6_tnl_exit_batch_net+0x5f5/0x890 net/ipv6/ip6_tunnel.c:2311 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 kvfree_call_rcu+0x74/0x990 kernel/rcu/tree.c:3550 drop_sysctl_table+0x3c0/0x4e0 fs/proc/proc_sysctl.c:1647 unregister_sysctl_table fs/proc/proc_sysctl.c:1685 [inline] unregister_sysctl_table+0xc0/0x190 fs/proc/proc_sysctl.c:1660 nf_ct_frags6_sysctl_unregister net/ipv6/netfilter/nf_conntrack_reasm.c:111 [inline] nf_ct_net_exit+0x241/0x550 net/ipv6/netfilter/nf_conntrack_reasm.c:523 ops_exit_list+0xb0/0x160 net/core/net_namespace.c:168 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 ffff8880240a9000 which belongs to the cache kmalloc-192 of size 192 The buggy address is located 64 bytes inside of 192-byte region [ffff8880240a9000, ffff8880240a90c0) The buggy address belongs to the page: page:ffffea0000902a40 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x240a9 flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000200 0000000000000000 dead000000000001 ffff888010c41a00 raw: 0000000000000000 0000000080100010 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 0x112cc0(GFP_USER|__GFP_NOWARN|__GFP_NORETRY), pid 14446, ts 423918521359, free_ts 397615231882 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+0x1a7/0x300 mm/mempolicy.c:2190 alloc_slab_page mm/slub.c:1799 [inline] allocate_slab mm/slub.c:1944 [inline] new_slab+0x28a/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] slab_alloc mm/slub.c:3238 [inline] __kmalloc+0x2fb/0x340 mm/slub.c:4420 kmalloc include/linux/slab.h:587 [inline] kzalloc include/linux/slab.h:716 [inline] __register_sysctl_table+0x112/0x1090 fs/proc/proc_sysctl.c:1318 rds_tcp_init_net+0x1db/0x4f0 net/rds/tcp.c:551 ops_init+0xaf/0x470 net/core/net_namespace.c:140 setup_net+0x54f/0xbb0 net/core/net_namespace.c:328 copy_net_ns+0x318/0x760 net/core/net_namespace.c:472 create_new_namespaces+0x3f6/0xb20 kernel/nsproxy.c:110 unshare_nsproxy_namespaces+0xc1/0x1f0 kernel/nsproxy.c:226 ksys_unshare+0x445/0x920 kernel/fork.c:3075 __do_sys_unshare kernel/fork.c:3146 [inline] __se_sys_unshare kernel/fork.c:3144 [inline] __x64_sys_unshare+0x2d/0x40 kernel/fork.c:3144 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 kasan_depopulate_vmalloc_pte+0x5c/0x70 mm/kasan/shadow.c:380 apply_to_pte_range mm/memory.c:2518 [inline] apply_to_pmd_range mm/memory.c:2562 [inline] apply_to_pud_range mm/memory.c:2598 [inline] apply_to_p4d_range mm/memory.c:2634 [inline] __apply_to_page_range+0x686/0x1030 mm/memory.c:2668 kasan_release_vmalloc+0xa7/0xc0 mm/kasan/shadow.c:490 __purge_vmap_area_lazy+0x8f9/0x1c50 mm/vmalloc.c:1708 try_purge_vmap_area_lazy mm/vmalloc.c:1727 [inline] free_vmap_area_noflush+0xa57/0xd00 mm/vmalloc.c:1769 free_unmap_vmap_area mm/vmalloc.c:1782 [inline] remove_vm_area+0x1ca/0x230 mm/vmalloc.c:2528 vm_remove_mappings mm/vmalloc.c:2557 [inline] __vunmap+0x392/0xb70 mm/vmalloc.c:2622 free_work+0x58/0x70 mm/vmalloc.c:95 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 Memory state around the buggy address: ffff8880240a8f00: fb fb fb fb fb fc fc fc fc fc fc fc fc fc fc fc ffff8880240a8f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff8880240a9000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880240a9080: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff8880240a9100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================