================================================================== 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 ffff888161906070 by task kworker/u4:22/26106 CPU: 0 PID: 26106 Comm: kworker/u4:22 Not tainted 5.15.132-syzkaller-01173-g754f8cc9b7de #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/06/2023 Workqueue: writeback wb_workfn (flush-7:3) 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 31051: 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:1847 sk_alloc+0x38/0x430 net/core/sock.c:1904 __netlink_create net/netlink/af_netlink.c:647 [inline] netlink_create+0x3e9/0x640 net/netlink/af_netlink.c:710 __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 0: 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:1887 [inline] __sk_destruct+0x496/0x5b0 net/core/sock.c:1973 sk_destruct net/core/sock.c:1988 [inline] __sk_free+0x36c/0x470 net/core/sock.c:1999 sk_free+0x51/0x80 net/core/sock.c:2010 deferred_put_nlk_sk+0x1e2/0x220 net/netlink/af_netlink.c:747 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 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 __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 The buggy address belongs to the object at ffff888161906000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 112 bytes inside of 2048-byte region [ffff888161906000, ffff888161906800) The buggy address belongs to the page: page:ffffea0005864000 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x161900 head:ffffea0005864000 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x4000000000010200(slab|head|zone=1) raw: 4000000000010200 0000000000000000 0000000200000001 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 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 20153, ts 2364312304011, free_ts 2364280769895 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+0x16d/0x270 mm/slub.c:4423 kmalloc include/linux/slab.h:608 [inline] f2fs_kmalloc fs/f2fs/f2fs.h:3348 [inline] f2fs_fill_super+0x38de/0x81a0 fs/f2fs/super.c:4145 mount_bdev+0x282/0x3b0 fs/super.c:1387 f2fs_mount+0x34/0x40 fs/f2fs/super.c:4551 legacy_get_tree+0xf1/0x190 fs/fs_context.c:611 vfs_get_tree+0x88/0x290 fs/super.c:1517 do_new_mount+0x28b/0xad0 fs/namespace.c:2994 path_mount+0x671/0x1070 fs/namespace.c:3324 do_mount fs/namespace.c:3337 [inline] __do_sys_mount fs/namespace.c:3545 [inline] __se_sys_mount+0x2c4/0x3b0 fs/namespace.c:3522 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_compound_page+0x78/0xa0 mm/page_alloc.c:825 destroy_compound_page include/linux/mm.h:989 [inline] __put_compound_page+0x73/0xb0 mm/swap.c:111 __put_page+0xbf/0xe0 mm/swap.c:127 put_page include/linux/mm.h:1295 [inline] __skb_frag_unref include/linux/skbuff.h:3235 [inline] skb_release_data+0x405/0xa80 net/core/skbuff.c:673 skb_release_all net/core/skbuff.c:743 [inline] __kfree_skb+0x50/0x70 net/core/skbuff.c:757 sk_wmem_free_skb include/net/sock.h:1634 [inline] tcp_rtx_queue_unlink_and_free+0x203/0x720 include/net/tcp.h:1902 tcp_clean_rtx_queue net/ipv4/tcp_input.c:3329 [inline] tcp_ack+0x2351/0x6770 net/ipv4/tcp_input.c:3882 tcp_rcv_established+0x709/0x1ac0 net/ipv4/tcp_input.c:5962 tcp_v4_do_rcv+0x3d7/0xa00 net/ipv4/tcp_ipv4.c:1722 tcp_v4_rcv+0x23dd/0x2a70 net/ipv4/tcp_ipv4.c:2124 ip_protocol_deliver_rcu+0x32f/0x710 net/ipv4/ip_input.c:204 ip_local_deliver_finish net/ipv4/ip_input.c:231 [inline] NF_HOOK include/linux/netfilter.h:305 [inline] ip_local_deliver+0x2c6/0x590 net/ipv4/ip_input.c:252 dst_input include/net/dst.h:454 [inline] ip_sublist_rcv_finish net/ipv4/ip_input.c:577 [inline] ip_list_rcv_finish net/ipv4/ip_input.c:628 [inline] ip_sublist_rcv+0x7e2/0x980 net/ipv4/ip_input.c:636 ip_list_rcv+0x422/0x470 net/ipv4/ip_input.c:671 Memory state around the buggy address: ffff888161905f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888161905f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff888161906000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888161906080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888161906100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================