================================================================== 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 ffff888113121070 by task kworker/u4:5/542 CPU: 0 PID: 542 Comm: kworker/u4:5 Tainted: G W 5.15.131-syzkaller-00653-gea586874d2f9 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/06/2023 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_background_flush fs/fs-writeback.c:2150 [inline] wb_do_writeback fs/fs-writeback.c:2238 [inline] wb_workfn+0xc12/0x1110 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 20082: 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:1846 sk_alloc+0x38/0x430 net/core/sock.c:1903 __netlink_create net/netlink/af_netlink.c:647 [inline] __netlink_kernel_create+0x1c4/0x910 net/netlink/af_netlink.c:2049 netlink_kernel_create include/linux/netlink.h:62 [inline] genl_pernet_init+0xa1/0x150 net/netlink/genetlink.c:1399 ops_init+0x1cf/0x4a0 net/core/net_namespace.c:135 setup_net+0x34b/0xb50 net/core/net_namespace.c:329 copy_net_ns+0x35c/0x5b0 net/core/net_namespace.c:473 create_new_namespaces+0x416/0x670 kernel/nsproxy.c:110 unshare_nsproxy_namespaces+0x126/0x180 kernel/nsproxy.c:226 ksys_unshare+0x542/0xa00 kernel/fork.c:3160 __do_sys_unshare kernel/fork.c:3234 [inline] __se_sys_unshare kernel/fork.c:3232 [inline] __x64_sys_unshare+0x38/0x40 kernel/fork.c:3232 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 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_release+0x7e/0x140 net/socket.c:677 netlink_kernel_release+0x4d/0x60 net/netlink/af_netlink.c:2111 genl_pernet_exit+0x40/0x60 net/netlink/genetlink.c:1412 ops_exit_list net/core/net_namespace.c:169 [inline] cleanup_net+0x64b/0xc00 net/core/net_namespace.c:596 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 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 kvfree_call_rcu+0xb2/0x7d0 kernel/rcu/tree.c:3583 drop_sysctl_table+0x311/0x450 fs/proc/proc_sysctl.c:1682 unregister_sysctl_table+0x7b/0x120 fs/proc/proc_sysctl.c:1720 unregister_net_sysctl_table+0x15/0x20 net/sysctl_net.c:175 __addrconf_sysctl_unregister net/ipv6/addrconf.c:7121 [inline] addrconf_sysctl_unregister net/ipv6/addrconf.c:7149 [inline] addrconf_ifdown+0x178f/0x1ae0 net/ipv6/addrconf.c:3931 addrconf_notify+0x37d/0xdd0 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 net/core/dev.c:2031 [inline] unregister_netdevice_many+0xe0a/0x17c0 net/core/dev.c:11082 vti6_exit_batch_net+0x260/0x2a0 net/ipv6/ip6_vti.c:1190 ops_exit_list net/core/net_namespace.c:174 [inline] cleanup_net+0x6ce/0xc00 net/core/net_namespace.c:596 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 The buggy address belongs to the object at ffff888113121000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 112 bytes inside of 2048-byte region [ffff888113121000, ffff888113121800) The buggy address belongs to the page: page:ffffea00044c4800 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888113121000 pfn:0x113120 head:ffffea00044c4800 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x4000000000010200(slab|head|zone=1) raw: 4000000000010200 ffffea0005214a08 ffffea000562cc08 ffff888100043200 raw: ffff888113121000 0000000000080003 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 3461, ts 288572396605, free_ts 288571969753 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x1a3/0x1b0 mm/page_alloc.c:2602 prep_new_page+0x1b/0x110 mm/page_alloc.c:2608 get_page_from_freelist+0x3550/0x35d0 mm/page_alloc.c:4482 __alloc_pages+0x206/0x5e0 mm/page_alloc.c:5773 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 kmalloc_reserve net/core/skbuff.c:357 [inline] __alloc_skb+0x10c/0x550 net/core/skbuff.c:428 alloc_skb include/linux/skbuff.h:1183 [inline] nlmsg_new include/net/netlink.h:953 [inline] audit_buffer_alloc kernel/audit.c:1782 [inline] audit_log_start+0x456/0xa80 kernel/audit.c:1900 audit_seccomp+0x61/0x1e0 kernel/auditsc.c:2724 seccomp_log kernel/seccomp.c:988 [inline] __seccomp_filter+0xc08/0x1c60 kernel/seccomp.c:1254 __secure_computing+0xf0/0x300 kernel/seccomp.c:1316 syscall_trace_enter kernel/entry/common.c:68 [inline] __syscall_enter_from_user_work kernel/entry/common.c:90 [inline] syscall_enter_from_user_mode+0xd5/0x1b0 kernel/entry/common.c:108 do_syscall_64+0x1e/0xb0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x61/0xcb page last free stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] free_pages_prepare mm/page_alloc.c:1469 [inline] free_pcp_prepare mm/page_alloc.c:1541 [inline] free_unref_page_prepare+0x7c8/0x7d0 mm/page_alloc.c:3531 free_unref_page+0xe6/0x730 mm/page_alloc.c:3613 free_the_page mm/page_alloc.c:802 [inline] __free_pages+0x61/0xf0 mm/page_alloc.c:5849 __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 audit_buffer_alloc kernel/audit.c:1778 [inline] audit_log_start+0x42f/0xa80 kernel/audit.c:1900 audit_seccomp+0x61/0x1e0 kernel/auditsc.c:2724 Memory state around the buggy address: ffff888113120f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888113120f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff888113121000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888113121080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888113121100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================