================================================================== BUG: KASAN: use-after-free in io_wq_worker_running+0xfe/0x130 io_uring/io-wq.c:674 Read of size 4 at addr ffff8880820f8c04 by task iou-wrk-14727/14762 CPU: 1 PID: 14762 Comm: iou-wrk-14727 Not tainted 6.2.0-rc3-syzkaller-00030-ge8f60cd7db24 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2d0 lib/dump_stack.c:106 print_address_description+0x74/0x340 mm/kasan/report.c:306 print_report+0x107/0x220 mm/kasan/report.c:417 kasan_report+0x139/0x170 mm/kasan/report.c:517 io_wq_worker_running+0xfe/0x130 io_uring/io-wq.c:674 schedule_timeout+0xac/0x300 kernel/time/timer.c:2143 unix_wait_for_peer+0x242/0x330 net/unix/af_unix.c:1449 unix_dgram_sendmsg+0x1413/0x2170 net/unix/af_unix.c:2047 sock_sendmsg_nosec net/socket.c:714 [inline] sock_sendmsg net/socket.c:734 [inline] ____sys_sendmsg+0x597/0x8e0 net/socket.c:2476 __sys_sendmsg_sock+0x25/0x30 net/socket.c:2542 io_sendmsg+0x33b/0xa20 io_uring/net.c:315 io_issue_sqe+0x494/0xcd0 io_uring/io_uring.c:1856 io_wq_submit_work+0x44a/0x9c0 io_uring/io_uring.c:1932 io_worker_handle_work+0x8e1/0xee0 io_uring/io-wq.c:587 io_wqe_worker+0x36c/0xde0 io_uring/io-wq.c:632 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 Allocated by task 14727: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4c/0x70 mm/kasan/common.c:52 ____kasan_kmalloc mm/kasan/common.c:371 [inline] __kasan_kmalloc+0x97/0xb0 mm/kasan/common.c:380 kmalloc_node include/linux/slab.h:606 [inline] kzalloc_node include/linux/slab.h:731 [inline] create_io_worker+0xef/0x630 io_uring/io-wq.c:801 create_worker_cb+0x16b/0x330 io_uring/io-wq.c:339 task_work_run+0x243/0x300 kernel/task_work.c:179 get_signal+0x1654/0x1820 kernel/signal.c:2635 arch_do_signal_or_restart+0x8d/0x5f0 arch/x86/kernel/signal.c:306 exit_to_user_mode_loop+0x74/0x160 kernel/entry/common.c:168 exit_to_user_mode_prepare+0xad/0x110 kernel/entry/common.c:203 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline] syscall_exit_to_user_mode+0x2e/0x60 kernel/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x63/0xcd Freed by task 14762: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4c/0x70 mm/kasan/common.c:52 kasan_save_free_info+0x27/0x40 mm/kasan/generic.c:518 ____kasan_slab_free+0xd6/0x120 mm/kasan/common.c:236 kasan_slab_free include/linux/kasan.h:177 [inline] slab_free_hook mm/slub.c:1781 [inline] slab_free_freelist_hook+0x12e/0x1a0 mm/slub.c:1807 slab_free mm/slub.c:3787 [inline] __kmem_cache_free+0x71/0x110 mm/slub.c:3800 io_wq_cancel_tw_create+0x77/0xd0 io_uring/io-wq.c:1233 io_queue_worker_create+0x384/0x430 io_uring/io-wq.c:381 sched_submit_work kernel/sched/core.c:6597 [inline] schedule+0x63/0x190 kernel/sched/core.c:6628 schedule_timeout+0xac/0x300 kernel/time/timer.c:2143 unix_wait_for_peer+0x242/0x330 net/unix/af_unix.c:1449 unix_dgram_sendmsg+0x1413/0x2170 net/unix/af_unix.c:2047 sock_sendmsg_nosec net/socket.c:714 [inline] sock_sendmsg net/socket.c:734 [inline] ____sys_sendmsg+0x597/0x8e0 net/socket.c:2476 __sys_sendmsg_sock+0x25/0x30 net/socket.c:2542 io_sendmsg+0x33b/0xa20 io_uring/net.c:315 io_issue_sqe+0x494/0xcd0 io_uring/io_uring.c:1856 io_wq_submit_work+0x44a/0x9c0 io_uring/io_uring.c:1932 io_worker_handle_work+0x8e1/0xee0 io_uring/io-wq.c:587 io_wqe_worker+0x36c/0xde0 io_uring/io-wq.c:632 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 Last potentially related work creation: kasan_save_stack+0x3b/0x60 mm/kasan/common.c:45 __kasan_record_aux_stack+0xb0/0xc0 mm/kasan/generic.c:488 task_work_add+0x87/0x340 kernel/task_work.c:48 io_queue_worker_create+0x1e2/0x430 io_uring/io-wq.c:373 sched_submit_work kernel/sched/core.c:6597 [inline] schedule+0x63/0x190 kernel/sched/core.c:6628 schedule_timeout+0xac/0x300 kernel/time/timer.c:2143 unix_wait_for_peer+0x242/0x330 net/unix/af_unix.c:1449 unix_dgram_sendmsg+0x1413/0x2170 net/unix/af_unix.c:2047 sock_sendmsg_nosec net/socket.c:714 [inline] sock_sendmsg net/socket.c:734 [inline] ____sys_sendmsg+0x597/0x8e0 net/socket.c:2476 __sys_sendmsg_sock+0x25/0x30 net/socket.c:2542 io_sendmsg+0x33b/0xa20 io_uring/net.c:315 io_issue_sqe+0x494/0xcd0 io_uring/io_uring.c:1856 io_wq_submit_work+0x44a/0x9c0 io_uring/io_uring.c:1932 io_worker_handle_work+0x8e1/0xee0 io_uring/io-wq.c:587 io_wqe_worker+0x36c/0xde0 io_uring/io-wq.c:632 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 Second to last potentially related work creation: kasan_save_stack+0x3b/0x60 mm/kasan/common.c:45 __kasan_record_aux_stack+0xb0/0xc0 mm/kasan/generic.c:488 kvfree_call_rcu+0x118/0x8c0 kernel/rcu/tree.c:3376 io_worker_exit io_uring/io-wq.c:237 [inline] io_wqe_worker+0xc77/0xde0 io_uring/io-wq.c:661 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 The buggy address belongs to the object at ffff8880820f8c00 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 4 bytes inside of 512-byte region [ffff8880820f8c00, ffff8880820f8e00) The buggy address belongs to the physical page: page:ffffea0002083e00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x820f8 head:ffffea0002083e00 order:2 compound_mapcount:0 subpages_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffff888012841c80 dead000000000100 dead000000000122 raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5091, tgid 5091 (syz-executor.5), ts 247007806387, free_ts 247006709794 prep_new_page mm/page_alloc.c:2531 [inline] get_page_from_freelist+0x72b/0x7a0 mm/page_alloc.c:4283 __alloc_pages+0x259/0x560 mm/page_alloc.c:5549 alloc_slab_page+0xbd/0x190 mm/slub.c:1851 allocate_slab+0x5e/0x3c0 mm/slub.c:1998 new_slab mm/slub.c:2051 [inline] ___slab_alloc+0x7f4/0xeb0 mm/slub.c:3193 __slab_alloc mm/slub.c:3292 [inline] __slab_alloc_node mm/slub.c:3345 [inline] slab_alloc_node mm/slub.c:3442 [inline] __kmem_cache_alloc_node+0x25b/0x340 mm/slub.c:3491 __do_kmalloc_node mm/slab_common.c:967 [inline] __kmalloc_node_track_caller+0x9c/0x190 mm/slab_common.c:988 kmalloc_reserve net/core/skbuff.c:492 [inline] __alloc_skb+0x12c/0x2c0 net/core/skbuff.c:565 alloc_skb include/linux/skbuff.h:1270 [inline] nlmsg_new include/net/netlink.h:1002 [inline] netlink_ack+0x36e/0x1290 net/netlink/af_netlink.c:2501 netlink_rcv_skb+0x289/0x470 net/netlink/af_netlink.c:2570 netlink_unicast_kernel net/netlink/af_netlink.c:1330 [inline] netlink_unicast+0x7e7/0x9c0 net/netlink/af_netlink.c:1356 netlink_sendmsg+0x9b3/0xcd0 net/netlink/af_netlink.c:1932 sock_sendmsg_nosec net/socket.c:714 [inline] sock_sendmsg net/socket.c:734 [inline] __sys_sendto+0x46d/0x5f0 net/socket.c:2117 __do_sys_sendto net/socket.c:2129 [inline] __se_sys_sendto net/socket.c:2125 [inline] __x64_sys_sendto+0xda/0xf0 net/socket.c:2125 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1446 [inline] free_pcp_prepare+0x751/0x780 mm/page_alloc.c:1496 free_unref_page_prepare mm/page_alloc.c:3369 [inline] free_unref_page+0x19/0x4c0 mm/page_alloc.c:3464 __stack_depot_save+0x430/0x4a0 lib/stackdepot.c:506 kasan_save_stack mm/kasan/common.c:46 [inline] kasan_set_track+0x61/0x70 mm/kasan/common.c:52 ____kasan_kmalloc mm/kasan/common.c:371 [inline] __kasan_kmalloc+0x97/0xb0 mm/kasan/common.c:380 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slab_common.c:968 [inline] __kmalloc+0xaf/0x190 mm/slab_common.c:981 kmalloc include/linux/slab.h:584 [inline] kzalloc include/linux/slab.h:720 [inline] new_dir fs/proc/proc_sysctl.c:971 [inline] get_subdir fs/proc/proc_sysctl.c:1015 [inline] __register_sysctl_table+0xaf7/0x1340 fs/proc/proc_sysctl.c:1366 neigh_sysctl_register+0x410/0x4f0 net/core/neighbour.c:3854 addrconf_sysctl_register+0xac/0x180 net/ipv6/addrconf.c:7126 ipv6_add_dev+0xb9d/0x1150 net/ipv6/addrconf.c:450 addrconf_notify+0x782/0x1010 net/ipv6/addrconf.c:3528 notifier_call_chain kernel/notifier.c:87 [inline] raw_notifier_call_chain+0xe7/0x170 kernel/notifier.c:455 call_netdevice_notifiers_info net/core/dev.c:1944 [inline] call_netdevice_notifiers_extack net/core/dev.c:1982 [inline] call_netdevice_notifiers+0x14e/0x1d0 net/core/dev.c:1996 register_netdevice+0x15e4/0x1a30 net/core/dev.c:10078 register_vlan_dev+0x361/0x7c0 net/8021q/vlan.c:179 vlan_newlink+0x450/0x5a0 net/8021q/vlan_netlink.c:191 Memory state around the buggy address: ffff8880820f8b00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880820f8b80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff8880820f8c00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880820f8c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880820f8d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================