================================================================== 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 ffff888160c95070 by task kworker/u4:9/593 CPU: 1 PID: 593 Comm: kworker/u4:9 Not tainted 5.15.77-syzkaller-00764-g7048384c9872 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 Workqueue: writeback wb_workfn (flush-7:2) 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 618: 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+0x203/0x350 mm/slub.c:4423 __kmalloc_node include/linux/slab.h:457 [inline] kmalloc_node include/linux/slab.h:614 [inline] kvmalloc_node+0x82/0x130 mm/util.c:623 kvmalloc include/linux/mm.h:844 [inline] kvmalloc_array include/linux/mm.h:862 [inline] alloc_fdtable+0xea/0x2b0 fs/file.c:136 dup_fd+0x781/0xa40 fs/file.c:354 copy_files+0xe6/0x200 kernel/fork.c:1601 copy_process+0x11e9/0x3250 kernel/fork.c:2233 kernel_clone+0x22d/0x990 kernel/fork.c:2646 __do_sys_clone kernel/fork.c:2772 [inline] __se_sys_clone kernel/fork.c:2756 [inline] __x64_sys_clone+0x289/0x310 kernel/fork.c:2756 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x61/0xcb Freed by task 6046: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x4c/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:220 [inline] slab_free_hook mm/slub.c:1721 [inline] slab_free_freelist_hook+0xc9/0x1a0 mm/slub.c:1747 slab_free mm/slub.c:3515 [inline] kfree+0xc8/0x210 mm/slub.c:4575 kvfree+0x35/0x40 mm/util.c:658 __free_fdtable fs/file.c:36 [inline] put_files_struct+0x297/0x330 fs/file.c:451 exit_files+0x80/0xa0 fs/file.c:464 do_exit+0x649/0x24d0 kernel/exit.c:823 do_group_exit+0x13a/0x300 kernel/exit.c:925 get_signal+0x77e/0x1600 kernel/signal.c:2890 arch_do_signal_or_restart+0x9f/0x670 arch/x86/kernel/signal.c:865 handle_signal_work kernel/entry/common.c:148 [inline] exit_to_user_mode_loop+0xd4/0x110 kernel/entry/common.c:172 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 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 exit_task_work include/linux/task_work.h:32 [inline] do_exit+0x67e/0x24d0 kernel/exit.c:828 do_group_exit+0x13a/0x300 kernel/exit.c:925 get_signal+0x77e/0x1600 kernel/signal.c:2890 arch_do_signal_or_restart+0x9f/0x670 arch/x86/kernel/signal.c:865 handle_signal_work kernel/entry/common.c:148 [inline] exit_to_user_mode_loop+0xd4/0x110 kernel/entry/common.c:172 exit_to_user_mode_prepare+0x3b/0x40 kernel/entry/common.c:207 irqentry_exit_to_user_mode+0x9/0x20 kernel/entry/common.c:313 irqentry_exit+0x12/0x40 kernel/entry/common.c:404 exc_page_fault+0x75/0x1a0 arch/x86/mm/fault.c:1620 asm_exc_page_fault+0x27/0x30 arch/x86/include/asm/idtentry.h:568 The buggy address belongs to the object at ffff888160c95000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 112 bytes inside of 2048-byte region [ffff888160c95000, ffff888160c95800) The buggy address belongs to the page: page:ffffea0005832400 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x160c90 head:ffffea0005832400 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x4000000000010200(slab|head|zone=1) raw: 4000000000010200 0000000000000000 0000000100000001 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 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 617, ts 220891566341, free_ts 0 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_array include/linux/slab.h:631 [inline] kcalloc include/linux/slab.h:660 [inline] veth_alloc_queues drivers/net/veth.c:1320 [inline] veth_dev_init+0x1b6/0x350 drivers/net/veth.c:1347 register_netdevice+0x650/0x1720 net/core/dev.c:10262 veth_newlink+0x90b/0xe60 drivers/net/veth.c:1732 __rtnl_newlink net/core/rtnetlink.c:3462 [inline] rtnl_newlink+0x1484/0x2060 net/core/rtnetlink.c:3510 rtnetlink_rcv_msg+0x951/0xc50 net/core/rtnetlink.c:5587 netlink_rcv_skb+0x1f0/0x460 net/netlink/af_netlink.c:2523 rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:5605 netlink_unicast_kernel net/netlink/af_netlink.c:1321 [inline] netlink_unicast+0x91a/0xb10 net/netlink/af_netlink.c:1347 netlink_sendmsg+0x946/0xd00 net/netlink/af_netlink.c:1942 page_owner free stack trace missing Memory state around the buggy address: ffff888160c94f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888160c94f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff888160c95000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888160c95080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888160c95100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================