================================================================== BUG: KASAN: use-after-free in instrument_atomic_read_write include/linux/instrumented.h:101 [inline] BUG: KASAN: use-after-free in atomic_long_try_cmpxchg_acquire include/linux/atomic/atomic-instrumented.h:1667 [inline] BUG: KASAN: use-after-free in __down_read_trylock kernel/locking/rwsem.c:1275 [inline] BUG: KASAN: use-after-free in down_read_trylock+0xba/0x1d0 kernel/locking/rwsem.c:1531 Write of size 8 at addr ffff88813d804070 by task kworker/u4:8/1798 CPU: 0 PID: 1798 Comm: kworker/u4:8 Not tainted 5.15.78-syzkaller-00911-gc73b4619ad86 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 Workqueue: writeback wb_workfn (flush-7:5) Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x151/0x1b7 lib/dump_stack.c:106 print_address_description+0x87/0x3d0 mm/kasan/report.c:256 __kasan_report mm/kasan/report.c:435 [inline] kasan_report+0x1a6/0x1f0 mm/kasan/report.c:452 kasan_check_range+0x2aa/0x2e0 mm/kasan/generic.c:189 __kasan_check_write+0x14/0x20 mm/kasan/shadow.c:37 instrument_atomic_read_write include/linux/instrumented.h:101 [inline] atomic_long_try_cmpxchg_acquire include/linux/atomic/atomic-instrumented.h:1667 [inline] __down_read_trylock kernel/locking/rwsem.c:1275 [inline] down_read_trylock+0xba/0x1d0 kernel/locking/rwsem.c:1531 trylock_super+0x1f/0xf0 fs/super.c:418 __writeback_inodes_wb+0x121/0x410 fs/fs-writeback.c:1959 wb_writeback+0x420/0x9e0 fs/fs-writeback.c:2073 wb_check_old_data_flush fs/fs-writeback.c:2173 [inline] wb_do_writeback+0x995/0xbd0 fs/fs-writeback.c:2226 wb_workfn+0xf8/0x3e0 fs/fs-writeback.c:2255 process_one_work+0x6db/0xc00 kernel/workqueue.c:2313 worker_thread+0xb3e/0x1340 kernel/workqueue.c:2460 kthread+0x41c/0x500 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298 Allocated by task 8: 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+0xdc/0x110 mm/kasan/common.c:512 __kasan_kmalloc+0x9/0x10 mm/kasan/common.c:521 kasan_kmalloc include/linux/kasan.h:254 [inline] __kmalloc_track_caller+0x202/0x350 mm/slub.c:4946 kmalloc_reserve net/core/skbuff.c:357 [inline] __alloc_skb+0x10e/0x550 net/core/skbuff.c:428 alloc_skb include/linux/skbuff.h:1182 [inline] nlmsg_new include/net/netlink.h:953 [inline] rtmsg_ifinfo_build_skb+0x7f/0x180 net/core/rtnetlink.c:3824 unregister_netdevice_many+0xf99/0x1920 net/core/dev.c:11082 vti6_exit_batch_net+0x29b/0x2e0 net/ipv6/ip6_vti.c:1190 ops_exit_list net/core/net_namespace.c:174 [inline] cleanup_net+0x76d/0xce0 net/core/net_namespace.c:596 process_one_work+0x6db/0xc00 kernel/workqueue.c:2313 worker_thread+0xb3e/0x1340 kernel/workqueue.c:2460 kthread+0x41c/0x500 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298 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+0x56/0x340 kernel/workqueue.c:1369 __queue_work+0x934/0xcf0 kernel/workqueue.c:1535 queue_work_on+0xf2/0x170 kernel/workqueue.c:1562 queue_work include/linux/workqueue.h:507 [inline] schedule_work include/linux/workqueue.h:568 [inline] destroy_super_rcu+0xea/0x100 fs/super.c:172 rcu_do_batch+0x55b/0xbe0 kernel/rcu/tree.c:2509 rcu_core+0x506/0x1000 kernel/rcu/tree.c:2749 rcu_core_si+0x9/0x10 kernel/rcu/tree.c:2762 __do_softirq+0x27e/0x5dc kernel/softirq.c:565 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 __call_rcu kernel/rcu/tree.c:2993 [inline] call_rcu+0x140/0x1400 kernel/rcu/tree.c:3073 __put_super+0x277/0x2e0 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:1143 __cleanup_mnt+0x19/0x20 fs/namespace.c:1150 task_work_run+0x147/0x1b0 kernel/task_work.c:164 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop+0xfd/0x110 kernel/entry/common.c:175 exit_to_user_mode_prepare kernel/entry/common.c:207 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline] syscall_exit_to_user_mode+0x79/0xc0 kernel/entry/common.c:300 do_syscall_64+0x50/0xd0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x61/0xcb The buggy address belongs to the object at ffff88813d804000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 112 bytes inside of 2048-byte region [ffff88813d804000, ffff88813d804800) The buggy address belongs to the page: page:ffffea0004f60000 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88813d807000 pfn:0x13d800 head:ffffea0004f60000 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x4000000000010200(slab|head|zone=1) raw: 4000000000010200 ffffea0004501408 ffffea000415ee08 ffff888100043200 raw: ffff88813d807000 0000000000080002 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 21980, ts 978529003089, free_ts 974217476317 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x1ab/0x1b0 mm/page_alloc.c:2495 prep_new_page mm/page_alloc.c:2501 [inline] get_page_from_freelist+0x38b/0x400 mm/page_alloc.c:4281 __alloc_pages+0x3a8/0x7c0 mm/page_alloc.c:5548 allocate_slab+0x62/0x580 mm/slub.c:1928 new_slab mm/slub.c:1991 [inline] ___slab_alloc+0x2e2/0x6f0 mm/slub.c:3024 __slab_alloc+0x4a/0x90 mm/slub.c:3111 slab_alloc_node mm/slub.c:3202 [inline] slab_alloc mm/slub.c:3244 [inline] __kmalloc+0x25b/0x350 mm/slub.c:4419 kmalloc include/linux/slab.h:596 [inline] kzalloc include/linux/slab.h:721 [inline] __register_sysctl_table+0xee/0x1330 fs/proc/proc_sysctl.c:1320 register_net_sysctl+0x239/0x250 net/sysctl_net.c:169 __devinet_sysctl_register+0x1e7/0x2b0 net/ipv4/devinet.c:2577 devinet_sysctl_register+0x169/0x1e0 net/ipv4/devinet.c:2617 inetdev_init+0x27a/0x4b0 net/ipv4/devinet.c:276 inetdev_event+0x202/0x1090 net/ipv4/devinet.c:1530 notifier_call_chain kernel/notifier.c:83 [inline] raw_notifier_call_chain+0x9e/0x110 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+0x14e/0x1d0 net/core/dev.c:2031 register_netdevice+0x13bb/0x1720 net/core/dev.c:10363 page last free stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] free_pages_prepare mm/page_alloc.c:1364 [inline] free_pcp_prepare+0x448/0x450 mm/page_alloc.c:1435 free_unref_page_prepare mm/page_alloc.c:3433 [inline] free_unref_page+0x9c/0x370 mm/page_alloc.c:3513 free_the_page mm/page_alloc.c:706 [inline] __free_pages+0xd8/0x100 mm/page_alloc.c:5621 __free_slab+0xf0/0x1d0 mm/slub.c:2016 free_slab mm/slub.c:2031 [inline] discard_slab mm/slub.c:2037 [inline] __unfreeze_partials+0x17d/0x1b0 mm/slub.c:2523 put_cpu_partial+0xc4/0x120 mm/slub.c:2603 __slab_free+0x1c0/0x2f0 mm/slub.c:3384 do_slab_free mm/slub.c:3503 [inline] ___cache_free+0x112/0x130 mm/slub.c:3522 qlink_free+0x4d/0x90 mm/kasan/quarantine.c:157 qlist_free_all+0x4c/0xc0 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:244 [inline] slab_post_alloc_hook mm/slab.h:550 [inline] slab_alloc_node mm/slub.c:3236 [inline] slab_alloc mm/slub.c:3244 [inline] kmem_cache_alloc+0x189/0x2f0 mm/slub.c:3249 getname_flags+0xba/0x510 fs/namei.c:138 user_path_at_empty+0x2e/0x1b0 fs/namei.c:2852 user_path_at include/linux/namei.h:57 [inline] vfs_statx+0x104/0x6a0 fs/stat.c:221 Memory state around the buggy address: ffff88813d803f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88813d803f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88813d804000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88813d804080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88813d804100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================