================================================================== BUG: KASAN: use-after-free in instrument_atomic_write include/linux/instrumented.h:86 [inline] BUG: KASAN: use-after-free in clear_bit_unlock include/asm-generic/bitops/instrumented-lock.h:26 [inline] BUG: KASAN: use-after-free in io_queue_worker_create+0x453/0x4e0 fs/io-wq.c:366 Write of size 8 at addr ffff888070224cd8 by task kworker/1:14/12217 CPU: 1 PID: 12217 Comm: kworker/1:14 Not tainted 5.16.0-rc4-next-20211210-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events io_workqueue_create Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 print_address_description.constprop.0.cold+0xa5/0x3ed mm/kasan/report.c:255 __kasan_report mm/kasan/report.c:442 [inline] kasan_report.cold+0x83/0xdf mm/kasan/report.c:459 check_region_inline mm/kasan/generic.c:183 [inline] kasan_check_range+0x13d/0x180 mm/kasan/generic.c:189 instrument_atomic_write include/linux/instrumented.h:86 [inline] clear_bit_unlock include/asm-generic/bitops/instrumented-lock.h:26 [inline] io_queue_worker_create+0x453/0x4e0 fs/io-wq.c:366 io_workqueue_create+0x9e/0xe0 fs/io-wq.c:780 process_one_work+0x9ac/0x1680 kernel/workqueue.c:2307 worker_thread+0x652/0x11c0 kernel/workqueue.c:2454 kthread+0x405/0x4f0 kernel/kthread.c:345 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Allocated by task 3644: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:436 [inline] ____kasan_kmalloc mm/kasan/common.c:515 [inline] ____kasan_kmalloc mm/kasan/common.c:474 [inline] __kasan_kmalloc+0xa9/0xd0 mm/kasan/common.c:524 kmalloc_node include/linux/slab.h:599 [inline] kzalloc_node include/linux/slab.h:726 [inline] create_io_worker+0x108/0x640 fs/io-wq.c:792 io_wqe_create_worker fs/io-wq.c:303 [inline] io_wqe_enqueue+0x692/0xbc0 fs/io-wq.c:925 io_queue_async_work+0x28b/0x5d0 fs/io_uring.c:1614 io_queue_sqe_arm_apoll+0xd1/0x1a0 fs/io_uring.c:7090 __io_queue_sqe fs/io_uring.c:7119 [inline] io_queue_sqe fs/io_uring.c:7146 [inline] io_submit_sqe fs/io_uring.c:7354 [inline] io_submit_sqes+0x7c50/0x8fa0 fs/io_uring.c:7460 __do_sys_io_uring_enter+0xf6e/0x1f50 fs/io_uring.c:10160 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae Freed by task 3644: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38 kasan_set_track+0x21/0x30 mm/kasan/common.c:45 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:370 ____kasan_slab_free mm/kasan/common.c:366 [inline] ____kasan_slab_free+0x166/0x1a0 mm/kasan/common.c:328 kasan_slab_free include/linux/kasan.h:236 [inline] slab_free_hook mm/slub.c:1728 [inline] slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1754 slab_free mm/slub.c:3510 [inline] kfree+0xd0/0x4b0 mm/slub.c:4561 create_worker_cont+0x406/0x560 fs/io-wq.c:766 task_work_run+0xdd/0x1a0 kernel/task_work.c:164 tracehook_notify_signal include/linux/tracehook.h:214 [inline] handle_signal_work kernel/entry/common.c:146 [inline] exit_to_user_mode_loop kernel/entry/common.c:172 [inline] exit_to_user_mode_prepare+0x256/0x290 kernel/entry/common.c:207 __syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline] syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:300 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x44/0xae Last potentially related work creation: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38 __kasan_record_aux_stack+0xbe/0xd0 mm/kasan/generic.c:348 task_work_add+0x3a/0x190 kernel/task_work.c:38 io_queue_worker_create+0x3ee/0x4e0 fs/io-wq.c:365 io_workqueue_create+0x9e/0xe0 fs/io-wq.c:780 process_one_work+0x9ac/0x1680 kernel/workqueue.c:2307 worker_thread+0x652/0x11c0 kernel/workqueue.c:2454 kthread+0x405/0x4f0 kernel/kthread.c:345 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Second to last potentially related work creation: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38 __kasan_record_aux_stack+0xbe/0xd0 mm/kasan/generic.c:348 insert_work+0x48/0x370 kernel/workqueue.c:1368 __queue_work+0x5ca/0xf30 kernel/workqueue.c:1534 queue_work_on+0xee/0x110 kernel/workqueue.c:1562 queue_work include/linux/workqueue.h:502 [inline] schedule_work include/linux/workqueue.h:563 [inline] create_worker_cont+0x456/0x560 fs/io-wq.c:772 task_work_run+0xdd/0x1a0 kernel/task_work.c:164 tracehook_notify_signal include/linux/tracehook.h:214 [inline] handle_signal_work kernel/entry/common.c:146 [inline] exit_to_user_mode_loop kernel/entry/common.c:172 [inline] exit_to_user_mode_prepare+0x256/0x290 kernel/entry/common.c:207 __syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline] syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:300 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x44/0xae The buggy address belongs to the object at ffff888070224c00 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 216 bytes inside of 512-byte region [ffff888070224c00, ffff888070224e00) The buggy address belongs to the page: page:ffffea0001c08900 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x70224 head:ffffea0001c08900 order:2 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffffea0001f7c500 dead000000000002 ffff888010c41c80 raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd2820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 13, ts 134935003641, free_ts 134866419581 prep_new_page mm/page_alloc.c:2433 [inline] get_page_from_freelist+0xa72/0x2f40 mm/page_alloc.c:4164 __alloc_pages+0x1b2/0x500 mm/page_alloc.c:5376 alloc_pages+0x1aa/0x310 mm/mempolicy.c:2271 alloc_slab_page mm/slub.c:1799 [inline] allocate_slab mm/slub.c:1944 [inline] new_slab+0x28d/0x3a0 mm/slub.c:2004 ___slab_alloc+0x6be/0xd60 mm/slub.c:3019 __slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3106 slab_alloc_node mm/slub.c:3197 [inline] __kmalloc_node_track_caller+0x2cb/0x360 mm/slub.c:4956 kmalloc_reserve net/core/skbuff.c:354 [inline] __alloc_skb+0xde/0x340 net/core/skbuff.c:426 __napi_alloc_skb+0x70/0x310 net/core/skbuff.c:568 napi_alloc_skb include/linux/skbuff.h:2976 [inline] page_to_skb+0x188/0xba0 drivers/net/virtio_net.c:437 receive_mergeable drivers/net/virtio_net.c:1042 [inline] receive_buf+0xd24/0x50d0 drivers/net/virtio_net.c:1152 virtnet_receive drivers/net/virtio_net.c:1444 [inline] virtnet_poll+0x5d0/0x11b0 drivers/net/virtio_net.c:1553 __napi_poll+0xaf/0x440 net/core/dev.c:6360 napi_poll net/core/dev.c:6427 [inline] net_rx_action+0x801/0xb40 net/core/dev.c:6514 __do_softirq+0x29b/0x9c2 kernel/softirq.c:558 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1351 [inline] free_pcp_prepare+0x414/0xb60 mm/page_alloc.c:1403 free_unref_page_prepare mm/page_alloc.c:3324 [inline] free_unref_page+0x19/0x690 mm/page_alloc.c:3403 __unfreeze_partials+0x17c/0x1a0 mm/slub.c:2537 qlink_free mm/kasan/quarantine.c:146 [inline] qlist_free_all+0x5a/0x100 mm/kasan/quarantine.c:165 kasan_quarantine_reduce+0x180/0x200 mm/kasan/quarantine.c:272 __kasan_slab_alloc+0xa2/0xc0 mm/kasan/common.c:446 kasan_slab_alloc include/linux/kasan.h:260 [inline] slab_post_alloc_hook mm/slab.h:766 [inline] slab_alloc_node mm/slub.c:3231 [inline] __kmalloc_node_track_caller+0x238/0x360 mm/slub.c:4956 kmalloc_reserve net/core/skbuff.c:354 [inline] __alloc_skb+0xde/0x340 net/core/skbuff.c:426 alloc_skb_fclone include/linux/skbuff.h:1179 [inline] tcp_stream_alloc_skb+0x66/0x910 net/ipv4/tcp.c:861 tcp_sendmsg_locked+0xacd/0x3190 net/ipv4/tcp.c:1281 tcp_sendmsg+0x2b/0x40 net/ipv4/tcp.c:1440 inet_sendmsg+0x99/0xe0 net/ipv4/af_inet.c:817 sock_sendmsg_nosec net/socket.c:704 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:724 sock_write_iter+0x289/0x3c0 net/socket.c:1057 call_write_iter include/linux/fs.h:2079 [inline] new_sync_write+0x429/0x660 fs/read_write.c:503 vfs_write+0x7cd/0xae0 fs/read_write.c:590 Memory state around the buggy address: ffff888070224b80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888070224c00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888070224c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888070224d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888070224d80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================