================================================================== 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 kernel/locking/rwsem.c:1393 [inline] BUG: KASAN: use-after-free in down_read_trylock+0xba/0x1d0 kernel/locking/rwsem.c:1553 Write of size 8 at addr ffff88810ce68070 by task kworker/u4:2/109 CPU: 1 PID: 109 Comm: kworker/u4:2 Not tainted 5.10.181-syzkaller-00917-gba68ef2e2dd1 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023 Workqueue: writeback wb_workfn (flush-7:0) Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack_lvl+0x1e2/0x24b lib/dump_stack.c:118 print_address_description+0x81/0x3b0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:435 [inline] kasan_report+0x179/0x1c0 mm/kasan/report.c:452 kasan_check_range+0x293/0x2a0 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] 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 kernel/locking/rwsem.c:1393 [inline] down_read_trylock+0xba/0x1d0 kernel/locking/rwsem.c:1553 trylock_super+0x1f/0xf0 fs/super.c:418 __writeback_inodes_wb fs/fs-writeback.c:1795 [inline] wb_writeback+0x49d/0xc60 fs/fs-writeback.c:1910 wb_check_background_flush fs/fs-writeback.c:1978 [inline] wb_do_writeback fs/fs-writeback.c:2066 [inline] wb_workfn+0xc12/0x1110 fs/fs-writeback.c:2094 process_one_work+0x6dc/0xbd0 kernel/workqueue.c:2298 worker_thread+0xaea/0x1510 kernel/workqueue.c:2444 kthread+0x34b/0x3d0 kernel/kthread.c:313 ret_from_fork+0x1f/0x30 :299 Allocated by task 12119: 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:430 [inline] ____kasan_kmalloc+0xdb/0x110 mm/kasan/common.c:509 __kasan_kmalloc+0x9/0x10 mm/kasan/common.c:518 kasan_kmalloc include/linux/kasan.h:254 [inline] __kmalloc+0x1aa/0x330 mm/slub.c:4033 kmalloc include/linux/slab.h:557 [inline] sk_prot_alloc+0xbe/0x370 net/core/sock.c:1700 sk_alloc+0x38/0x4d0 net/core/sock.c:1758 __netlink_create net/netlink/af_netlink.c:639 [inline] netlink_create+0x3e9/0x640 net/netlink/af_netlink.c:702 __sock_create+0x3a6/0x760 net/socket.c:1417 sock_create net/socket.c:1468 [inline] __sys_socket+0x132/0x370 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 entry_SYSCALL_64_after_hwframe+0x61/0xc6 Last potentially related work creation: kasan_save_stack+0x3b/0x60 mm/kasan/common.c:38 __kasan_record_aux_stack+0xd3/0x100 mm/kasan/generic.c:348 kasan_record_aux_stack_noalloc+0xb/0x10 mm/kasan/generic.c:358 __call_rcu kernel/rcu/tree.c:2975 [inline] call_rcu+0x135/0x11f0 kernel/rcu/tree.c:3049 netlink_release+0x12df/0x16f0 net/netlink/af_netlink.c:811 __sock_release net/socket.c:597 [inline] sock_close+0xdf/0x270 net/socket.c:1267 __fput+0x309/0x760 fs/file_table.c:281 ____fput+0x15/0x20 fs/file_table.c:314 task_work_run+0x129/0x190 kernel/task_work.c:164 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_user_mode_loop+0xbf/0xd0 kernel/entry/common.c:172 exit_to_user_mode_prepare kernel/entry/common.c:199 [inline] syscall_exit_to_user_mode+0xbc/0x1d0 kernel/entry/common.c:274 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+0x3b/0x60 mm/kasan/common.c:38 __kasan_record_aux_stack+0xd3/0x100 mm/kasan/generic.c:348 kasan_record_aux_stack_noalloc+0xb/0x10 mm/kasan/generic.c:358 insert_work+0x56/0x310 kernel/workqueue.c:1349 __queue_work+0x96c/0xd20 kernel/workqueue.c:1515 queue_work_on+0x105/0x160 kernel/workqueue.c:1542 queue_work include/linux/workqueue.h:513 [inline] schedule_work include/linux/workqueue.h:574 [inline] destroy_super_rcu+0xd1/0xe0 fs/super.c:172 rcu_do_batch+0x597/0xc40 kernel/rcu/tree.c:2493 rcu_core+0x5ad/0xe40 kernel/rcu/tree.c:2734 rcu_core_si+0x9/0x10 kernel/rcu/tree.c:2747 __do_softirq+0x268/0x5bb kernel/softirq.c:309 The buggy address belongs to the object at ffff88810ce68000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 112 bytes inside of 2048-byte region [ffff88810ce68000, ffff88810ce68800) The buggy address belongs to the page: page:ffffea0004339a00 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88810ce6b000 pfn:0x10ce68 head:ffffea0004339a00 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x4000000000010200(slab|head) raw: 4000000000010200 ffffea00057a6008 ffffea0004457208 ffff888100042d80 raw: ffff88810ce6b000 0000000000080004 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 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 81, ts 3567111173, free_ts 0 set_page_owner include/linux/page_owner.h:35 [inline] post_alloc_hook mm/page_alloc.c:2455 [inline] prep_new_page+0x166/0x180 mm/page_alloc.c:2461 get_page_from_freelist+0x2d8c/0x2f30 mm/page_alloc.c:4253 __alloc_pages_nodemask+0x435/0xaf0 mm/page_alloc.c:5345 allocate_slab mm/slub.c:1808 [inline] new_slab+0x80/0x400 mm/slub.c:1869 new_slab_objects mm/slub.c:2627 [inline] ___slab_alloc+0x302/0x4b0 mm/slub.c:2791 __slab_alloc+0x63/0xa0 mm/slub.c:2831 slab_alloc_node mm/slub.c:2913 [inline] slab_alloc mm/slub.c:2955 [inline] __kmalloc_track_caller+0x1f8/0x320 mm/slub.c:4536 __kmalloc_reserve net/core/skbuff.c:143 [inline] __alloc_skb+0xbc/0x510 net/core/skbuff.c:211 alloc_skb include/linux/skbuff.h:1126 [inline] alloc_skb_with_frags+0xa1/0x570 net/core/skbuff.c:5927 sock_alloc_send_pskb+0x915/0xa50 net/core/sock.c:2361 unix_dgram_sendmsg+0x700/0x1f90 net/unix/af_unix.c:1740 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg net/socket.c:672 [inline] __sys_sendto+0x545/0x700 net/socket.c:1987 __do_sys_sendto net/socket.c:1999 [inline] __se_sys_sendto net/socket.c:1995 [inline] __x64_sys_sendto+0xe5/0x100 net/socket.c:1995 do_syscall_64+0x34/0x70 entry_SYSCALL_64_after_hwframe+0x61/0xc6 page_owner free stack trace missing Memory state around the buggy address: ffff88810ce67f00: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc ffff88810ce67f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88810ce68000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88810ce68080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88810ce68100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================