================================================================== BUG: KASAN: use-after-free in instrument_atomic_read include/linux/instrumented.h:71 [inline] BUG: KASAN: use-after-free in atomic_long_read include/linux/atomic/atomic-instrumented.h:1183 [inline] BUG: KASAN: use-after-free in __down_read_trylock kernel/locking/rwsem.c:1319 [inline] BUG: KASAN: use-after-free in down_read_trylock+0x7c/0x300 kernel/locking/rwsem.c:1586 Read of size 8 at addr ffff88810f0d0070 by task kworker/u4:4/643 CPU: 0 PID: 643 Comm: kworker/u4:4 Not tainted 5.15.122-syzkaller-00676-g1463976ddc64 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2023 Workqueue: writeback wb_workfn (flush-7:1) Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x151/0x1b7 lib/dump_stack.c:106 print_address_description+0x87/0x3b0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:427 [inline] kasan_report+0x179/0x1c0 mm/kasan/report.c:444 kasan_check_range+0x293/0x2a0 mm/kasan/generic.c:189 __kasan_check_read+0x11/0x20 mm/kasan/shadow.c:31 instrument_atomic_read include/linux/instrumented.h:71 [inline] atomic_long_read include/linux/atomic/atomic-instrumented.h:1183 [inline] __down_read_trylock kernel/locking/rwsem.c:1319 [inline] down_read_trylock+0x7c/0x300 kernel/locking/rwsem.c:1586 trylock_super+0x1f/0xf0 fs/super.c:418 __writeback_inodes_wb+0x101/0x3f0 fs/fs-writeback.c:1970 wb_writeback+0x3cd/0x9e0 fs/fs-writeback.c:2084 wb_check_old_data_flush fs/fs-writeback.c:2184 [inline] wb_do_writeback fs/fs-writeback.c:2237 [inline] wb_workfn+0xb3d/0x1110 fs/fs-writeback.c:2266 process_one_work+0x6bb/0xc10 kernel/workqueue.c:2317 worker_thread+0xad5/0x12a0 kernel/workqueue.c:2464 kthread+0x421/0x510 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298 Allocated by task 19826: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:433 [inline] ____kasan_kmalloc+0xdb/0x110 mm/kasan/common.c:512 __kasan_kmalloc+0x9/0x10 mm/kasan/common.c:521 kasan_kmalloc include/linux/kasan.h:227 [inline] __kmalloc+0x13a/0x270 mm/slub.c:4427 kmalloc include/linux/slab.h:608 [inline] sk_prot_alloc+0xf9/0x330 net/core/sock.c:1843 sk_alloc+0x38/0x430 net/core/sock.c:1900 packet_create+0xf5/0x7c0 net/packet/af_packet.c:3312 __sock_create+0x3a6/0x760 net/socket.c:1467 sock_create net/socket.c:1518 [inline] __sys_socket+0x132/0x370 net/socket.c:1560 __do_sys_socket net/socket.c:1569 [inline] __se_sys_socket net/socket.c:1567 [inline] __x64_sys_socket+0x7a/0x90 net/socket.c:1567 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x61/0xcb Freed by task 19826: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:45 kasan_set_free_info+0x23/0x40 mm/kasan/generic.c:370 ____kasan_slab_free+0x126/0x160 mm/kasan/common.c:365 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:373 kasan_slab_free include/linux/kasan.h:193 [inline] slab_free_hook mm/slub.c:1723 [inline] slab_free_freelist_hook+0xbd/0x190 mm/slub.c:1749 slab_free mm/slub.c:3519 [inline] kfree+0xc8/0x220 mm/slub.c:4579 sk_prot_free net/core/sock.c:1883 [inline] __sk_destruct+0x496/0x5b0 net/core/sock.c:1969 sk_destruct net/core/sock.c:1984 [inline] __sk_free+0x36c/0x470 net/core/sock.c:1995 sk_free+0x51/0x80 net/core/sock.c:2006 sock_put include/net/sock.h:1907 [inline] packet_release+0xb72/0xcb0 net/packet/af_packet.c:3141 __sock_release net/socket.c:649 [inline] sock_close+0xdf/0x270 net/socket.c:1317 __fput+0x3fe/0x910 fs/file_table.c:280 ____fput+0x15/0x20 fs/file_table.c:308 task_work_run+0x129/0x190 kernel/task_work.c:164 exit_task_work include/linux/task_work.h:32 [inline] do_exit+0xc60/0x2b60 kernel/exit.c:875 do_group_exit+0x141/0x310 kernel/exit.c:997 get_signal+0x7a3/0x1630 kernel/signal.c:2891 arch_do_signal_or_restart+0xbd/0x1680 arch/x86/kernel/signal.c:865 handle_signal_work kernel/entry/common.c:148 [inline] exit_to_user_mode_loop+0xa0/0xe0 kernel/entry/common.c:172 exit_to_user_mode_prepare+0x5a/0xa0 kernel/entry/common.c:208 __syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline] syscall_exit_to_user_mode+0x26/0x160 kernel/entry/common.c:301 do_syscall_64+0x49/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x61/0xcb Last potentially related work creation: kasan_save_stack+0x3b/0x60 mm/kasan/common.c:38 __kasan_record_aux_stack+0xd3/0xf0 mm/kasan/generic.c:348 kasan_record_aux_stack_noalloc+0xb/0x10 mm/kasan/generic.c:358 __call_rcu kernel/rcu/tree.c:2994 [inline] call_rcu+0x133/0x12a0 kernel/rcu/tree.c:3074 netlink_release+0x12df/0x16f0 net/netlink/af_netlink.c:819 __sock_release net/socket.c:649 [inline] sock_close+0xdf/0x270 net/socket.c:1317 __fput+0x3fe/0x910 fs/file_table.c:280 ____fput+0x15/0x20 fs/file_table.c:308 task_work_run+0x129/0x190 kernel/task_work.c:164 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop+0xc4/0xe0 kernel/entry/common.c:175 exit_to_user_mode_prepare+0x5a/0xa0 kernel/entry/common.c:208 __syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline] syscall_exit_to_user_mode+0x26/0x160 kernel/entry/common.c:301 do_syscall_64+0x49/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x61/0xcb Second to last potentially related work creation: kasan_save_stack+0x3b/0x60 mm/kasan/common.c:38 __kasan_record_aux_stack+0xd3/0xf0 mm/kasan/generic.c:348 kasan_record_aux_stack_noalloc+0xb/0x10 mm/kasan/generic.c:358 insert_work+0x56/0x320 kernel/workqueue.c:1373 __queue_work+0x92a/0xcd0 kernel/workqueue.c:1539 queue_work_on+0x105/0x170 kernel/workqueue.c:1566 queue_work include/linux/workqueue.h:509 [inline] schedule_work include/linux/workqueue.h:570 [inline] destroy_super_rcu+0xd1/0xe0 fs/super.c:172 rcu_do_batch+0x57a/0xc10 kernel/rcu/tree.c:2510 rcu_core+0x517/0x1020 kernel/rcu/tree.c:2750 rcu_core_si+0x9/0x10 kernel/rcu/tree.c:2763 __do_softirq+0x26d/0x5bf kernel/softirq.c:565 The buggy address belongs to the object at ffff88810f0d0000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 112 bytes inside of 2048-byte region [ffff88810f0d0000, ffff88810f0d0800) The buggy address belongs to the page: page:ffffea00043c3400 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10f0d0 head:ffffea00043c3400 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x4000000000010200(slab|head|zone=1) raw: 4000000000010200 0000000000000000 0000000400000001 ffff888100043200 raw: 0000000000000000 0000000000080008 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 575, ts 288032393736, free_ts 288030993125 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x1a3/0x1b0 mm/page_alloc.c:2600 prep_new_page mm/page_alloc.c:2606 [inline] get_page_from_freelist+0x2ed2/0x2f90 mm/page_alloc.c:4474 __alloc_pages+0x206/0x5e0 mm/page_alloc.c:5765 allocate_slab mm/slub.c:1932 [inline] new_slab+0x9a/0x4e0 mm/slub.c:1995 ___slab_alloc+0x39e/0x830 mm/slub.c:3028 __slab_alloc+0x4a/0x90 mm/slub.c:3115 slab_alloc_node mm/slub.c:3206 [inline] slab_alloc mm/slub.c:3248 [inline] __kmalloc_track_caller+0x16c/0x260 mm/slub.c:4945 kmemdup+0x24/0x50 mm/util.c:132 neigh_sysctl_register+0xb0/0x530 net/core/neighbour.c:3635 addrconf_sysctl_register+0xae/0x1a0 net/ipv6/addrconf.c:7129 ipv6_add_dev+0xc84/0x1140 net/ipv6/addrconf.c:454 addrconf_notify+0x593/0xdd0 net/ipv6/addrconf.c:3573 notifier_call_chain kernel/notifier.c:83 [inline] raw_notifier_call_chain+0x8c/0xf0 kernel/notifier.c:391 call_netdevice_notifiers_info net/core/dev.c:2005 [inline] call_netdevice_notifiers_extack net/core/dev.c:2017 [inline] call_netdevice_notifiers+0x145/0x1b0 net/core/dev.c:2031 register_netdevice+0xff1/0x1350 net/core/dev.c:10369 veth_newlink+0x948/0xe30 drivers/net/veth.c:1733 page last free stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] free_pages_prepare mm/page_alloc.c:1467 [inline] free_pcp_prepare mm/page_alloc.c:1539 [inline] free_unref_page_prepare+0x7c8/0x7d0 mm/page_alloc.c:3523 free_unref_page+0xe6/0x730 mm/page_alloc.c:3605 free_the_page mm/page_alloc.c:800 [inline] __free_pages+0x61/0xf0 mm/page_alloc.c:5841 __free_slab+0xec/0x1d0 mm/slub.c:2020 free_slab mm/slub.c:2035 [inline] discard_slab mm/slub.c:2041 [inline] __unfreeze_partials+0x165/0x1a0 mm/slub.c:2527 put_cpu_partial+0xc4/0x120 mm/slub.c:2607 __slab_free+0x1c8/0x290 mm/slub.c:3388 do_slab_free mm/slub.c:3507 [inline] ___cache_free+0x109/0x120 mm/slub.c:3526 qlink_free+0x4d/0x90 mm/kasan/quarantine.c:157 qlist_free_all+0x44/0xb0 mm/kasan/quarantine.c:176 kasan_quarantine_reduce+0x15a/0x180 mm/kasan/quarantine.c:283 __kasan_slab_alloc+0x2f/0xe0 mm/kasan/common.c:443 kasan_slab_alloc include/linux/kasan.h:217 [inline] slab_post_alloc_hook+0x53/0x2c0 mm/slab.h:550 slab_alloc_node mm/slub.c:3240 [inline] slab_alloc mm/slub.c:3248 [inline] kmem_cache_alloc+0xf5/0x200 mm/slub.c:3253 kmem_cache_alloc_node include/linux/slab.h:474 [inline] __alloc_skb+0xbe/0x550 net/core/skbuff.c:416 alloc_skb include/linux/skbuff.h:1183 [inline] nlmsg_new include/net/netlink.h:953 [inline] netlink_ack+0x33c/0xb10 net/netlink/af_netlink.c:2440 Memory state around the buggy address: ffff88810f0cff00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88810f0cff80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88810f0d0000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88810f0d0080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88810f0d0100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb 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