================================================================== BUG: KASAN: use-after-free in __wake_up_common+0x637/0x650 kernel/sched/wait.c:100 Read of size 8 at addr ffff88807f4722b0 by task syz-executor.3/2127 CPU: 0 PID: 2127 Comm: syz-executor.3 Tainted: G W 5.17.0-syzkaller-09727-g34af78c4e616 #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+0xa5/0x3e0 mm/kasan/report.c:247 __kasan_report mm/kasan/report.c:434 [inline] kasan_report.cold+0x83/0xdf mm/kasan/report.c:451 __wake_up_common+0x637/0x650 kernel/sched/wait.c:100 __wake_up_common_lock+0xd0/0x130 kernel/sched/wait.c:137 tty_release+0x657/0x1200 drivers/tty/tty_io.c:1781 __fput+0x286/0x9f0 fs/file_table.c:317 task_work_run+0xdd/0x1a0 kernel/task_work.c:164 exit_task_work include/linux/task_work.h:32 [inline] do_exit+0xaff/0x2a30 kernel/exit.c:794 do_group_exit+0xd2/0x2f0 kernel/exit.c:924 get_signal+0x4b0/0x28c0 kernel/signal.c:2903 arch_do_signal_or_restart+0x2a9/0x1c40 arch/x86/kernel/signal.c:868 handle_signal_work kernel/entry/common.c:149 [inline] exit_to_user_mode_loop kernel/entry/common.c:187 [inline] exit_to_user_mode_prepare+0x17d/0x290 kernel/entry/common.c:222 __syscall_exit_to_user_mode_work kernel/entry/common.c:304 [inline] syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:315 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f4292c89049 Code: Unable to access opcode bytes at RIP 0x7f4292c8901f. RSP: 002b:00007f4293e2c218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: 0000000000000001 RBX: 00007f4292d9bf68 RCX: 00007f4292c89049 RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007f4292d9bf6c RBP: 00007f4292d9bf60 R08: 00007ffc13e6f080 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000246 R12: 00007f4292d9bf6c R13: 00007f42932cfb1f R14: 00007f4293e2c300 R15: 0000000000022000 Allocated by task 2127: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:436 [inline] ____kasan_kmalloc mm/kasan/common.c:515 [inline] ____kasan_kmalloc mm/kasan/common.c:474 [inline] __kasan_kmalloc+0xa9/0xd0 mm/kasan/common.c:524 kmalloc include/linux/slab.h:581 [inline] io_arm_poll_handler+0x39d/0x940 fs/io_uring.c:6248 io_queue_sqe_arm_apoll+0x6d/0x430 fs/io_uring.c:7499 __io_queue_sqe fs/io_uring.c:7541 [inline] io_queue_sqe fs/io_uring.c:7568 [inline] io_submit_sqe fs/io_uring.c:7776 [inline] io_submit_sqes+0x7ddd/0x9310 fs/io_uring.c:7882 __do_sys_io_uring_enter+0x9f1/0x1520 fs/io_uring.c:10924 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 2127: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38 kasan_set_track+0x21/0x30 mm/kasan/common.c:45 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:370 ____kasan_slab_free mm/kasan/common.c:366 [inline] ____kasan_slab_free+0x166/0x1a0 mm/kasan/common.c:328 kasan_slab_free include/linux/kasan.h:215 [inline] slab_free_hook mm/slub.c:1728 [inline] slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1754 slab_free mm/slub.c:3510 [inline] kfree+0xd6/0x4d0 mm/slub.c:4552 io_clean_op+0x20a/0xd90 fs/io_uring.c:7137 io_dismantle_req fs/io_uring.c:2270 [inline] __io_req_complete_post+0x88c/0xc90 fs/io_uring.c:2108 io_req_complete_post+0x56/0x1d0 fs/io_uring.c:2121 io_apoll_task_func+0x1df/0x230 fs/io_uring.c:6003 handle_tw_list fs/io_uring.c:2480 [inline] tctx_task_work+0x1a2/0x1380 fs/io_uring.c:2514 task_work_run+0xdd/0x1a0 kernel/task_work.c:164 exit_task_work include/linux/task_work.h:32 [inline] do_exit+0xaff/0x2a30 kernel/exit.c:794 do_group_exit+0xd2/0x2f0 kernel/exit.c:924 get_signal+0x4b0/0x28c0 kernel/signal.c:2903 arch_do_signal_or_restart+0x2a9/0x1c40 arch/x86/kernel/signal.c:868 handle_signal_work kernel/entry/common.c:149 [inline] exit_to_user_mode_loop kernel/entry/common.c:187 [inline] exit_to_user_mode_prepare+0x17d/0x290 kernel/entry/common.c:222 __syscall_exit_to_user_mode_work kernel/entry/common.c:304 [inline] syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:315 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x44/0xae Last potentially related work creation: kasan_save_stack+0x1e/0x40 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:3595 drop_sysctl_table+0x3c0/0x4e0 fs/proc/proc_sysctl.c:1705 unregister_sysctl_table fs/proc/proc_sysctl.c:1743 [inline] unregister_sysctl_table+0xc0/0x190 fs/proc/proc_sysctl.c:1718 __ip_vs_lblc_exit+0x59/0xb0 net/netfilter/ipvs/ip_vs_lblc.c:588 ops_exit_list+0xb0/0x170 net/core/net_namespace.c:162 cleanup_net+0x4ea/0xb00 net/core/net_namespace.c:594 process_one_work+0x996/0x1610 kernel/workqueue.c:2289 worker_thread+0x665/0x1080 kernel/workqueue.c:2436 kthread+0x2e9/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Second to last potentially related work creation: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38 __kasan_record_aux_stack+0xbe/0xd0 mm/kasan/generic.c:348 call_rcu+0x99/0x790 kernel/rcu/tree.c:3074 nf_hook_entries_free net/netfilter/core.c:88 [inline] nf_hook_entries_free net/netfilter/core.c:75 [inline] __nf_unregister_net_hook+0x243/0x6d0 net/netfilter/core.c:520 nf_unregister_net_hook net/netfilter/core.c:533 [inline] nf_unregister_net_hooks+0x117/0x160 net/netfilter/core.c:607 nf_ct_netns_do_put+0x3c5/0x540 net/netfilter/nf_conntrack_proto.c:564 nf_ct_netns_put net/netfilter/nf_conntrack_proto.c:638 [inline] nf_ct_netns_put+0x56/0x80 net/netfilter/nf_conntrack_proto.c:630 nf_conncount_destroy+0x45/0x190 net/netfilter/nf_conncount.c:581 ovs_ct_limit_exit net/openvswitch/conntrack.c:1915 [inline] ovs_ct_exit+0x1a9/0x4a0 net/openvswitch/conntrack.c:2314 ovs_exit_net+0x19c/0xbc0 net/openvswitch/datapath.c:2612 ops_exit_list+0xb0/0x170 net/core/net_namespace.c:162 cleanup_net+0x4ea/0xb00 net/core/net_namespace.c:594 process_one_work+0x996/0x1610 kernel/workqueue.c:2289 worker_thread+0x665/0x1080 kernel/workqueue.c:2436 kthread+0x2e9/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 The buggy address belongs to the object at ffff88807f472280 which belongs to the cache kmalloc-96 of size 96 The buggy address is located 48 bytes inside of 96-byte region [ffff88807f472280, ffff88807f4722e0) The buggy address belongs to the page: page:ffffea0001fd1c80 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7f472 flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000200 ffffea0001637d00 dead000000000005 ffff888010c41780 raw: 0000000000000000 0000000080200020 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 0x12a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY), pid 3659, ts 45657823887, free_ts 45656420181 prep_new_page mm/page_alloc.c:2382 [inline] get_page_from_freelist+0xba2/0x3df0 mm/page_alloc.c:4123 __alloc_pages+0x1b2/0x500 mm/page_alloc.c:5349 alloc_pages+0x1aa/0x310 mm/mempolicy.c:2262 alloc_slab_page mm/slub.c:1799 [inline] allocate_slab+0x26c/0x3c0 mm/slub.c:1944 new_slab mm/slub.c:2004 [inline] ___slab_alloc+0x8df/0xf20 mm/slub.c:3005 __slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3092 slab_alloc_node mm/slub.c:3183 [inline] slab_alloc mm/slub.c:3225 [inline] kmem_cache_alloc_trace+0x310/0x3f0 mm/slub.c:3256 kmalloc include/linux/slab.h:581 [inline] dst_cow_metrics_generic+0x48/0x1e0 net/core/dst.c:199 dst_metrics_write_ptr include/net/dst.h:119 [inline] dst_metric_set include/net/dst.h:180 [inline] icmp6_dst_alloc+0x4c0/0x680 net/ipv6/route.c:3274 mld_sendpack+0x568/0xe40 net/ipv6/mcast.c:1807 mld_send_cr net/ipv6/mcast.c:2119 [inline] mld_ifc_work+0x71c/0xdc0 net/ipv6/mcast.c:2651 process_one_work+0x996/0x1610 kernel/workqueue.c:2289 worker_thread+0x665/0x1080 kernel/workqueue.c:2436 kthread+0x2e9/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1348 [inline] free_pcp_prepare+0x548/0xd10 mm/page_alloc.c:1400 free_unref_page_prepare mm/page_alloc.c:3269 [inline] free_unref_page+0x19/0x690 mm/page_alloc.c:3364 qlink_free mm/kasan/quarantine.c:157 [inline] qlist_free_all+0x6a/0x170 mm/kasan/quarantine.c:176 kasan_quarantine_reduce+0x180/0x200 mm/kasan/quarantine.c:283 __kasan_slab_alloc+0xa2/0xc0 mm/kasan/common.c:446 kasan_slab_alloc include/linux/kasan.h:239 [inline] slab_post_alloc_hook mm/slab.h:749 [inline] slab_alloc_node mm/slub.c:3217 [inline] kmem_cache_alloc_node+0x255/0x3f0 mm/slub.c:3267 __alloc_skb+0x215/0x340 net/core/skbuff.c:414 alloc_skb include/linux/skbuff.h:1300 [inline] alloc_skb_with_frags+0x93/0x730 net/core/skbuff.c:5988 sock_alloc_send_pskb+0x793/0x920 net/core/sock.c:2600 mld_newpack.isra.0+0x1be/0x750 net/ipv6/mcast.c:1746 add_grhead+0x283/0x360 net/ipv6/mcast.c:1849 add_grec+0x106a/0x1530 net/ipv6/mcast.c:1987 mld_send_cr net/ipv6/mcast.c:2113 [inline] mld_ifc_work+0x452/0xdc0 net/ipv6/mcast.c:2651 process_one_work+0x996/0x1610 kernel/workqueue.c:2289 worker_thread+0x665/0x1080 kernel/workqueue.c:2436 kthread+0x2e9/0x3a0 kernel/kthread.c:376 Memory state around the buggy address: ffff88807f472180: 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc ffff88807f472200: 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc >ffff88807f472280: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ^ ffff88807f472300: 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc ffff88807f472380: 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc ==================================================================