================================================================== BUG: KASAN: use-after-free in instrument_atomic_read_write include/linux/instrumented.h:101 [inline] BUG: KASAN: use-after-free in atomic64_try_cmpxchg_acquire include/asm-generic/atomic-instrumented.h:1515 [inline] BUG: KASAN: use-after-free in atomic_long_try_cmpxchg_acquire include/asm-generic/atomic-long.h:443 [inline] BUG: KASAN: use-after-free in __down_read_trylock+0xb6/0x260 kernel/locking/rwsem.c:1404 Write of size 8 at addr ffff88815e7af070 by task kworker/u4:0/7 CPU: 0 PID: 7 Comm: kworker/u4:0 Not tainted 5.10.161-syzkaller-00019-g416c4356f372 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023 Workqueue: writeback wb_workfn (flush-7:5) Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack_lvl+0x1e2/0x24b lib/dump_stack.c:118 print_address_description+0x81/0x3c0 mm/kasan/report.c:233 __kasan_report mm/kasan/report.c:419 [inline] kasan_report+0x1a4/0x1f0 mm/kasan/report.c:436 check_region_inline mm/kasan/generic.c:135 [inline] kasan_check_range+0x2aa/0x2e0 mm/kasan/generic.c:186 __kasan_check_write+0x14/0x20 mm/kasan/shadow.c:37 instrument_atomic_read_write include/linux/instrumented.h:101 [inline] atomic64_try_cmpxchg_acquire include/asm-generic/atomic-instrumented.h:1515 [inline] atomic_long_try_cmpxchg_acquire include/asm-generic/atomic-long.h:443 [inline] __down_read_trylock+0xb6/0x260 kernel/locking/rwsem.c:1404 down_read_trylock+0x9/0x10 kernel/locking/rwsem.c:1573 trylock_super+0x1f/0xf0 fs/super.c:418 __writeback_inodes_wb fs/fs-writeback.c:1792 [inline] wb_writeback+0x4da/0xc20 fs/fs-writeback.c:1907 wb_check_old_data_flush fs/fs-writeback.c:2009 [inline] wb_do_writeback+0x995/0xbd0 fs/fs-writeback.c:2062 wb_workfn+0xf8/0x3f0 fs/fs-writeback.c:2091 process_one_work+0x726/0xc10 kernel/workqueue.c:2296 worker_thread+0xb27/0x1550 kernel/workqueue.c:2442 kthread+0x349/0x3d0 kernel/kthread.c:313 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:299 Allocated by task 9169: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:428 [inline] ____kasan_kmalloc+0xdc/0x110 mm/kasan/common.c:507 __kasan_kmalloc+0x9/0x10 mm/kasan/common.c:516 kasan_kmalloc include/linux/kasan.h:269 [inline] __kmalloc+0x1f7/0x360 mm/slub.c:4042 kmalloc include/linux/slab.h:557 [inline] sk_prot_alloc+0xbc/0x250 net/core/sock.c:1692 sk_alloc+0x38/0x4c0 net/core/sock.c:1746 __netlink_create net/netlink/af_netlink.c:637 [inline] netlink_create+0x3d8/0x630 net/netlink/af_netlink.c:700 __sock_create+0x399/0x770 net/socket.c:1417 sock_create net/socket.c:1468 [inline] __sys_socket+0x133/0x370 net/socket.c:1510 __do_sys_socket net/socket.c:1519 [inline] __se_sys_socket net/socket.c:1517 [inline] __x64_sys_socket+0x7a/0x90 net/socket.c:1517 do_syscall_64+0x34/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xc6 Freed by task 160: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x4c/0x80 mm/kasan/common.c:46 kasan_set_free_info+0x23/0x40 mm/kasan/generic.c:357 ____kasan_slab_free+0x121/0x160 mm/kasan/common.c:360 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:368 kasan_slab_free include/linux/kasan.h:235 [inline] slab_free_hook mm/slub.c:1604 [inline] slab_free_freelist_hook+0xcc/0x1a0 mm/slub.c:1630 slab_free mm/slub.c:3212 [inline] kfree+0xc3/0x290 mm/slub.c:4200 sk_prot_free net/core/sock.c:1729 [inline] __sk_destruct+0x48d/0x540 net/core/sock.c:1815 sk_destruct net/core/sock.c:1830 [inline] __sk_free+0x364/0x470 net/core/sock.c:1841 sk_free+0x51/0x90 net/core/sock.c:1852 deferred_put_nlk_sk+0x201/0x240 net/netlink/af_netlink.c:737 rcu_do_batch+0x59e/0xc40 kernel/rcu/tree.c:2485 rcu_core+0x59b/0xe30 kernel/rcu/tree.c:2726 rcu_core_si+0x9/0x10 kernel/rcu/tree.c:2739 __do_softirq+0x27e/0x596 kernel/softirq.c:305 Last potentially related work creation: kasan_save_stack+0x36/0x60 mm/kasan/common.c:38 kasan_record_aux_stack+0xca/0xf0 mm/kasan/generic.c:345 __call_rcu kernel/rcu/tree.c:2967 [inline] call_rcu+0x140/0x1300 kernel/rcu/tree.c:3041 netlink_release+0x1334/0x1780 net/netlink/af_netlink.c:809 __sock_release net/socket.c:597 [inline] sock_close+0xdb/0x250 net/socket.c:1267 __fput+0x348/0x7c0 fs/file_table.c:281 ____fput+0x15/0x20 fs/file_table.c:314 task_work_run+0x147/0x1b0 kernel/task_work.c:154 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_user_mode_loop+0xc8/0xe0 kernel/entry/common.c:164 exit_to_user_mode_prepare kernel/entry/common.c:191 [inline] syscall_exit_to_user_mode+0x77/0xa0 kernel/entry/common.c:266 do_syscall_64+0x40/0x70 arch/x86/entry/common.c:56 entry_SYSCALL_64_after_hwframe+0x61/0xc6 Second to last potentially related work creation: kasan_save_stack+0x36/0x60 mm/kasan/common.c:38 kasan_record_aux_stack+0xca/0xf0 mm/kasan/generic.c:345 insert_work+0x56/0x330 kernel/workqueue.c:1348 __queue_work+0x971/0xd30 kernel/workqueue.c:1514 queue_work_on+0xf2/0x150 kernel/workqueue.c:1541 queue_work include/linux/workqueue.h:513 [inline] schedule_work include/linux/workqueue.h:574 [inline] destroy_super_rcu+0xea/0x100 fs/super.c:172 rcu_do_batch+0x59e/0xc40 kernel/rcu/tree.c:2485 rcu_core+0x59b/0xe30 kernel/rcu/tree.c:2726 rcu_core_si+0x9/0x10 kernel/rcu/tree.c:2739 __do_softirq+0x27e/0x596 kernel/softirq.c:305 The buggy address belongs to the object at ffff88815e7af000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 112 bytes inside of 2048-byte region [ffff88815e7af000, ffff88815e7af800) The buggy address belongs to the page: page:ffffea000579ea00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x15e7a8 head:ffffea000579ea00 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x8000000000010200(slab|head) raw: 8000000000010200 dead000000000100 dead000000000122 ffff888100042d80 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 0xd28c0(GFP_NOWAIT|__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 387, ts 277253412354, free_ts 0 set_page_owner include/linux/page_owner.h:35 [inline] post_alloc_hook mm/page_alloc.c:2386 [inline] prep_new_page mm/page_alloc.c:2392 [inline] get_page_from_freelist+0x755/0x810 mm/page_alloc.c:4073 __alloc_pages_nodemask+0x3b6/0x890 mm/page_alloc.c:5160 alloc_slab_page mm/slub.c:1815 [inline] allocate_slab+0x78/0x540 mm/slub.c:1817 new_slab mm/slub.c:1878 [inline] new_slab_objects mm/slub.c:2636 [inline] ___slab_alloc+0x131/0x2e0 mm/slub.c:2800 __slab_alloc+0x63/0xa0 mm/slub.c:2840 slab_alloc_node mm/slub.c:2922 [inline] slab_alloc mm/slub.c:2964 [inline] __kmalloc_track_caller+0x23e/0x350 mm/slub.c:4545 __kmalloc_reserve net/core/skbuff.c:143 [inline] pskb_expand_head+0x127/0x1140 net/core/skbuff.c:1639 netlink_trim+0x197/0x230 net/netlink/af_netlink.c:1295 netlink_broadcast_filtered+0x76/0x1200 net/netlink/af_netlink.c:1500 netlink_broadcast net/netlink/af_netlink.c:1545 [inline] nlmsg_multicast include/net/netlink.h:1033 [inline] nlmsg_notify+0x100/0x1d0 net/netlink/af_netlink.c:2558 rtnl_notify net/core/rtnetlink.c:737 [inline] rtmsg_ifinfo_send net/core/rtnetlink.c:3832 [inline] rtmsg_ifinfo_event net/core/rtnetlink.c:3847 [inline] rtmsg_ifinfo+0xe6/0x120 net/core/rtnetlink.c:3853 register_netdevice+0x151d/0x1790 net/core/dev.c:10064 __ip_tunnel_create+0x2af/0x370 net/ipv4/ip_tunnel.c:267 ip_tunnel_init_net+0x29b/0x750 net/ipv4/ip_tunnel.c:1069 ipgre_tap_init_net+0x29/0x30 net/ipv4/ip_gre.c:1693 ops_init+0x1bf/0x4a0 net/core/net_namespace.c:153 page_owner free stack trace missing Memory state around the buggy address: ffff88815e7aef00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88815e7aef80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88815e7af000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88815e7af080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88815e7af100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================