================================================================== 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:1265 [inline] BUG: KASAN: use-after-free in down_read_trylock+0x7b/0x230 kernel/locking/rwsem.c:1527 Read of size 8 at addr ffff888115aa2070 by task kworker/u4:4/511 CPU: 1 PID: 511 Comm: kworker/u4:4 Not tainted 5.15.137-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/09/2023 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+0x87/0x3a0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:434 [inline] kasan_report+0x177/0x1c0 mm/kasan/report.c:451 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:1265 [inline] down_read_trylock+0x7b/0x230 kernel/locking/rwsem.c:1527 trylock_super+0x1f/0xf0 fs/super.c:418 __writeback_inodes_wb+0x101/0x3f0 fs/fs-writeback.c:1975 wb_writeback+0x3cd/0x9e0 fs/fs-writeback.c:2089 wb_check_background_flush fs/fs-writeback.c:2155 [inline] wb_do_writeback fs/fs-writeback.c:2243 [inline] wb_workfn+0xc12/0x1110 fs/fs-writeback.c:2271 process_one_work+0x6bb/0xc10 kernel/workqueue.c:2310 worker_thread+0xad2/0x12a0 kernel/workqueue.c:2457 kthread+0x421/0x510 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298 Allocated by task 5503: 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:434 [inline] ____kasan_kmalloc+0xdb/0x110 mm/kasan/common.c:513 __kasan_kmalloc+0x9/0x10 mm/kasan/common.c:522 kasan_kmalloc include/linux/kasan.h:264 [inline] kmem_cache_alloc_trace+0x115/0x210 mm/slub.c:3247 kmalloc include/linux/slab.h:591 [inline] kzalloc include/linux/slab.h:721 [inline] alloc_super+0x5d/0x7d0 fs/super.c:203 sget+0x1e5/0x4c0 fs/super.c:624 mount_bdev+0xea/0x3b0 fs/super.c:1360 f2fs_mount+0x34/0x40 fs/f2fs/super.c:4469 legacy_get_tree+0xee/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 __x64_sys_mount+0xbf/0xd0 fs/namespace.c:3522 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 478: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x4b/0x80 mm/kasan/common.c:46 kasan_set_free_info+0x23/0x40 mm/kasan/generic.c:360 ____kasan_slab_free+0x126/0x160 mm/kasan/common.c:366 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:374 kasan_slab_free include/linux/kasan.h:230 [inline] slab_free_hook mm/slub.c:1705 [inline] slab_free_freelist_hook+0xbd/0x190 mm/slub.c:1731 slab_free mm/slub.c:3499 [inline] kfree+0xc8/0x220 mm/slub.c:4559 destroy_super_work+0x40/0x50 fs/super.c:165 process_one_work+0x6bb/0xc10 kernel/workqueue.c:2310 worker_thread+0xad2/0x12a0 kernel/workqueue.c:2457 kthread+0x421/0x510 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298 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:348 insert_work+0x56/0x320 kernel/workqueue.c:1366 __queue_work+0x92a/0xcd0 kernel/workqueue.c:1532 queue_work_on+0x105/0x170 kernel/workqueue.c:1559 queue_work include/linux/workqueue.h:503 [inline] schedule_work include/linux/workqueue.h:564 [inline] destroy_super_rcu+0xd1/0xe0 fs/super.c:172 rcu_do_batch+0x577/0xc10 kernel/rcu/tree.c:2510 rcu_core+0x514/0x1020 kernel/rcu/tree.c:2750 rcu_core_si+0x9/0x10 kernel/rcu/tree.c:2763 __do_softirq+0x243/0x595 kernel/softirq.c:558 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:348 __call_rcu kernel/rcu/tree.c:2994 [inline] call_rcu+0x133/0x12a0 kernel/rcu/tree.c:3074 __put_super+0x26d/0x2e0 fs/super.c:299 put_super fs/super.c:313 [inline] deactivate_locked_super+0xe1/0x110 fs/super.c:346 deactivate_super+0xbe/0xf0 fs/super.c:366 cleanup_mnt+0x45c/0x510 fs/namespace.c:1143 __cleanup_mnt+0x19/0x20 fs/namespace.c:1150 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 ffff888115aa2000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 112 bytes inside of 2048-byte region [ffff888115aa2000, ffff888115aa2800) The buggy address belongs to the page: page:ffffea000456a800 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x115aa0 head:ffffea000456a800 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x4000000000010200(slab|head|zone=1) raw: 4000000000010200 ffffea000432e600 0000000200000002 ffff888100042000 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 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 218, ts 4768918089, free_ts 0 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x15d/0x170 mm/page_alloc.c:2420 prep_new_page mm/page_alloc.c:2426 [inline] get_page_from_freelist+0x33e6/0x34c0 mm/page_alloc.c:4159 __alloc_pages+0x38a/0x7b0 mm/page_alloc.c:5421 allocate_slab mm/slub.c:1912 [inline] new_slab+0x92/0x490 mm/slub.c:1975 ___slab_alloc+0x39e/0x830 mm/slub.c:3008 __slab_alloc+0x4a/0x90 mm/slub.c:3095 slab_alloc_node mm/slub.c:3186 [inline] slab_alloc mm/slub.c:3228 [inline] __kmalloc+0x16d/0x270 mm/slub.c:4403 kmalloc include/linux/slab.h:596 [inline] sk_prot_alloc+0xf8/0x220 net/core/sock.c:1845 sk_alloc+0x38/0x430 net/core/sock.c:1898 __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:1484 sock_create net/socket.c:1535 [inline] __sys_socket+0x132/0x370 net/socket.c:1577 __do_sys_socket net/socket.c:1586 [inline] __se_sys_socket net/socket.c:1584 [inline] __x64_sys_socket+0x7a/0x90 net/socket.c:1584 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 page_owner free stack trace missing Memory state around the buggy address: ffff888115aa1f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888115aa1f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff888115aa2000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888115aa2080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888115aa2100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================