================================================================== 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 ffff8881172fc070 by task kworker/u4:6/15352 CPU: 0 PID: 15352 Comm: kworker/u4:6 Tainted: G W 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-7:2) 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 22467: 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_node include/linux/slab.h:418 [inline] kmalloc_node include/linux/slab.h:575 [inline] kvmalloc_node+0x82/0x130 mm/util.c:612 kvmalloc include/linux/mm.h:822 [inline] xt_alloc_table_info+0x42/0xa0 net/netfilter/x_tables.c:1172 do_replace net/ipv6/netfilter/ip6_tables.c:1142 [inline] do_ip6t_set_ctl+0xa95/0x3ed0 net/ipv6/netfilter/ip6_tables.c:1639 nf_setsockopt+0x27e/0x2a0 net/netfilter/nf_sockopt.c:101 ipv6_setsockopt+0x2cce/0x4570 net/ipv6/ipv6_sockglue.c:1015 tcp_setsockopt+0x238/0x3590 net/ipv4/tcp.c:3431 sock_common_setsockopt+0xa2/0xc0 net/core/sock.c:3267 __sys_setsockopt+0x585/0x870 net/socket.c:2122 __do_sys_setsockopt net/socket.c:2133 [inline] __se_sys_setsockopt net/socket.c:2130 [inline] __x64_sys_setsockopt+0xbf/0xd0 net/socket.c:2130 do_syscall_64+0x34/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xc6 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 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 __call_rcu kernel/rcu/tree.c:2967 [inline] call_rcu+0x140/0x1300 kernel/rcu/tree.c:3041 __put_super+0x24c/0x2a0 fs/super.c:299 put_super fs/super.c:313 [inline] deactivate_locked_super+0xe4/0x100 fs/super.c:346 deactivate_super+0xa5/0xd0 fs/super.c:366 cleanup_mnt+0x45f/0x510 fs/namespace.c:1118 __cleanup_mnt+0x19/0x20 fs/namespace.c:1125 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 The buggy address belongs to the object at ffff8881172fc000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 112 bytes inside of 2048-byte region [ffff8881172fc000, ffff8881172fc800) The buggy address belongs to the page: page:ffffea00045cbe00 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff8881172f8000 pfn:0x1172f8 head:ffffea00045cbe00 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x8000000000010200(slab|head) raw: 8000000000010200 ffff888100040a90 ffffea000454ec08 ffff888100042d80 raw: ffff8881172f8000 0000000000080006 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 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 4050, ts 293301026541, free_ts 293298889587 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 kmemdup+0x24/0x50 mm/util.c:131 neigh_sysctl_register+0xb0/0x550 net/core/neighbour.c:3657 devinet_sysctl_register+0xaa/0x1e0 net/ipv4/devinet.c:2609 inetdev_init+0x254/0x460 net/ipv4/devinet.c:276 inetdev_event+0x202/0x1090 net/ipv4/devinet.c:1531 notifier_call_chain kernel/notifier.c:83 [inline] raw_notifier_call_chain+0x9e/0x110 kernel/notifier.c:410 call_netdevice_notifiers_info net/core/dev.c:2054 [inline] call_netdevice_notifiers_extack net/core/dev.c:2066 [inline] call_netdevice_notifiers+0x14e/0x1d0 net/core/dev.c:2080 register_netdevice+0x1404/0x1790 net/core/dev.c:10050 register_netdev+0x3c/0x50 net/core/dev.c:10143 ip6_tnl_init_net+0x2d8/0x390 net/ipv6/ip6_tunnel.c:2318 page last free stack trace: reset_page_owner include/linux/page_owner.h:28 [inline] free_pages_prepare mm/page_alloc.c:1332 [inline] __free_pages_ok+0x7f8/0x830 mm/page_alloc.c:1612 free_the_page mm/page_alloc.c:5221 [inline] __free_pages+0x383/0x570 mm/page_alloc.c:5228 __free_slab+0xd3/0x190 mm/slub.c:1903 free_slab mm/slub.c:1918 [inline] discard_slab mm/slub.c:1924 [inline] unfreeze_partials+0x17d/0x1b0 mm/slub.c:2419 put_cpu_partial+0xc8/0x190 mm/slub.c:2455 __slab_free+0x2d8/0x3a0 mm/slub.c:3104 do_slab_free mm/slub.c:3200 [inline] ___cache_free+0x11f/0x140 mm/slub.c:3219 qlink_free+0x38/0x40 mm/kasan/quarantine.c:146 qlist_free_all+0x4c/0xc0 mm/kasan/quarantine.c:165 kasan_quarantine_reduce+0x15a/0x170 mm/kasan/quarantine.c:272 __kasan_slab_alloc+0x2f/0xe0 mm/kasan/common.c:438 kasan_slab_alloc include/linux/kasan.h:259 [inline] slab_post_alloc_hook include/../mm/slab.h:583 [inline] slab_alloc_node mm/slub.c:2956 [inline] slab_alloc mm/slub.c:2964 [inline] kmem_cache_alloc+0x16c/0x300 mm/slub.c:2969 kmem_cache_zalloc include/linux/slab.h:654 [inline] __kernfs_new_node+0xdb/0x6e0 fs/kernfs/dir.c:635 kernfs_new_node+0x97/0x170 fs/kernfs/dir.c:697 __kernfs_create_file+0x4a/0x270 fs/kernfs/file.c:985 sysfs_add_file_mode_ns+0x273/0x320 fs/sysfs/file.c:306 Memory state around the buggy address: ffff8881172fbf00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8881172fbf80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff8881172fc000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8881172fc080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881172fc100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== attempt to access beyond end of device loop5: rw=2049, want=40992, limit=40427 attempt to access beyond end of device loop5: rw=2049, want=40992, limit=40427