================================================================== BUG: KASAN: use-after-free in instrument_atomic_write include/linux/instrumented.h:86 [inline] BUG: KASAN: use-after-free in io_queue_worker_create+0x1cc/0x320 include/asm-generic/bitops/instrumented-lock.h:25 Write of size 8 at addr ffff88805a4c00d8 by task kworker/1:11/4214 CPU: 1 PID: 4214 Comm: kworker/1:11 Not tainted 5.16.0-rc4-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+0x1dc/0x2d8 lib/dump_stack.c:106 print_address_description+0x65/0x380 mm/kasan/report.c:247 __kasan_report mm/kasan/report.c:433 [inline] kasan_report+0x19a/0x1f0 mm/kasan/report.c:450 kasan_check_range+0x2b5/0x2f0 mm/kasan/generic.c:189 instrument_atomic_write include/linux/instrumented.h:86 [inline] io_queue_worker_create+0x1cc/0x320 include/asm-generic/bitops/instrumented-lock.h:25 io_workqueue_create+0x75/0xb0 fs/io-wq.c:780 process_one_work+0x853/0x1140 kernel/workqueue.c:2298 worker_thread+0xac1/0x1320 kernel/workqueue.c:2445 kthread+0x468/0x490 kernel/kthread.c:327 ret_from_fork+0x1f/0x30 Allocated by task 26823: 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+0xdc/0x110 mm/kasan/common.c:513 kasan_kmalloc include/linux/kasan.h:269 [inline] kmem_cache_alloc_node_trace+0x26f/0x370 mm/slub.c:3289 kmalloc_node include/linux/slab.h:608 [inline] kzalloc_node include/linux/slab.h:735 [inline] create_io_worker+0xef/0x630 fs/io-wq.c:792 io_wqe_create_worker fs/io-wq.c:300 [inline] io_wqe_enqueue+0xa7d/0xd80 fs/io-wq.c:924 io_queue_async_work+0x2f5/0x660 fs/io_uring.c:1585 io_queue_sqe_arm_apoll fs/io_uring.c:7004 [inline] __io_queue_sqe+0x40c/0x780 fs/io_uring.c:7033 tctx_task_work+0x355/0x560 fs/io_uring.c:2245 task_work_run+0x146/0x1c0 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+0x180/0x220 kernel/entry/common.c:207 __syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline] syscall_exit_to_user_mode+0x2e/0x70 kernel/entry/common.c:300 do_syscall_64+0x53/0xd0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x44/0xae Freed by task 26823: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x4c/0x80 mm/kasan/common.c:46 kasan_set_free_info+0x1f/0x40 mm/kasan/generic.c:370 ____kasan_slab_free+0x10d/0x150 mm/kasan/common.c:366 kasan_slab_free include/linux/kasan.h:235 [inline] slab_free_hook mm/slub.c:1723 [inline] slab_free_freelist_hook+0x12e/0x1a0 mm/slub.c:1749 slab_free mm/slub.c:3513 [inline] kfree+0xe1/0x330 mm/slub.c:4561 create_worker_cont+0x4ca/0x5a0 fs/io-wq.c:766 task_work_run+0x146/0x1c0 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+0x180/0x220 kernel/entry/common.c:207 __syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline] syscall_exit_to_user_mode+0x2e/0x70 kernel/entry/common.c:300 do_syscall_64+0x53/0xd0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x44/0xae Last potentially related work creation: kasan_save_stack+0x3b/0x60 mm/kasan/common.c:38 __kasan_record_aux_stack+0xfa/0x130 mm/kasan/generic.c:348 task_work_add+0x2f/0x1b0 kernel/task_work.c:38 io_queue_worker_create+0x1b4/0x320 fs/io-wq.c:362 io_workqueue_create+0x75/0xb0 fs/io-wq.c:780 process_one_work+0x853/0x1140 kernel/workqueue.c:2298 worker_thread+0xac1/0x1320 kernel/workqueue.c:2445 kthread+0x468/0x490 kernel/kthread.c:327 ret_from_fork+0x1f/0x30 Second to last potentially related work creation: kasan_save_stack+0x3b/0x60 mm/kasan/common.c:38 __kasan_record_aux_stack+0xfa/0x130 mm/kasan/generic.c:348 insert_work+0x54/0x400 kernel/workqueue.c:1354 __queue_work+0x928/0xc60 kernel/workqueue.c:1520 queue_work_on+0x12b/0x220 kernel/workqueue.c:1547 queue_work include/linux/workqueue.h:502 [inline] schedule_work include/linux/workqueue.h:563 [inline] create_worker_cont+0x442/0x5a0 fs/io-wq.c:772 task_work_run+0x146/0x1c0 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+0x180/0x220 kernel/entry/common.c:207 __syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline] syscall_exit_to_user_mode+0x2e/0x70 kernel/entry/common.c:300 do_syscall_64+0x53/0xd0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x44/0xae The buggy address belongs to the object at ffff88805a4c0000 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 216 bytes inside of 512-byte region [ffff88805a4c0000, ffff88805a4c0200) The buggy address belongs to the page: page:ffffea0001693000 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x5a4c0 head:ffffea0001693000 order:2 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffffea00016e6900 dead000000000002 ffff888011441c80 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 0x1d2a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 2933, ts 65765194886, free_ts 58517533373 prep_new_page mm/page_alloc.c:2418 [inline] get_page_from_freelist+0x729/0x9e0 mm/page_alloc.c:4149 __alloc_pages+0x255/0x580 mm/page_alloc.c:5369 alloc_slab_page mm/slub.c:1793 [inline] allocate_slab+0xcc/0x4d0 mm/slub.c:1930 new_slab mm/slub.c:1993 [inline] ___slab_alloc+0x41e/0xc40 mm/slub.c:3022 __slab_alloc mm/slub.c:3109 [inline] slab_alloc_node mm/slub.c:3200 [inline] __kmalloc_node_track_caller+0x2df/0x400 mm/slub.c:4956 kmalloc_reserve net/core/skbuff.c:354 [inline] __alloc_skb+0x127/0x5a0 net/core/skbuff.c:426 skb_copy+0xe8/0x750 net/core/skbuff.c:1586 mac80211_hwsim_tx_frame_no_nl+0xd8b/0x1770 drivers/net/wireless/mac80211_hwsim.c:1565 mac80211_hwsim_tx_frame+0x1cb/0x220 drivers/net/wireless/mac80211_hwsim.c:1784 mac80211_hwsim_beacon_tx+0x46c/0x890 drivers/net/wireless/mac80211_hwsim.c:1838 __iterate_interfaces+0x23e/0x4b0 net/mac80211/util.c:793 ieee80211_iterate_active_interfaces_atomic+0x9b/0x120 net/mac80211/util.c:829 mac80211_hwsim_beacon+0x9f/0x180 drivers/net/wireless/mac80211_hwsim.c:1861 __run_hrtimer kernel/time/hrtimer.c:1685 [inline] __hrtimer_run_queues+0x50b/0xa60 kernel/time/hrtimer.c:1749 hrtimer_run_softirq+0x1b7/0x5d0 kernel/time/hrtimer.c:1766 __do_softirq+0x392/0x7a3 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:1338 [inline] free_pcp_prepare+0xd1c/0xe00 mm/page_alloc.c:1389 free_unref_page_prepare mm/page_alloc.c:3309 [inline] free_unref_page+0x7d/0x580 mm/page_alloc.c:3388 destroy_compound_page include/linux/mm.h:906 [inline] __put_compound_page mm/swap.c:112 [inline] release_pages+0x6e5/0x17d0 mm/swap.c:956 tlb_batch_pages_flush mm/mmu_gather.c:49 [inline] tlb_flush_mmu_free mm/mmu_gather.c:242 [inline] tlb_flush_mmu+0x780/0x910 mm/mmu_gather.c:249 zap_pte_range+0x1a21/0x1ba0 mm/memory.c:1418 zap_pmd_range mm/memory.c:1467 [inline] zap_pud_range mm/memory.c:1496 [inline] zap_p4d_range mm/memory.c:1517 [inline] unmap_page_range+0x745/0xa20 mm/memory.c:1538 unmap_vmas+0x202/0x390 mm/memory.c:1615 exit_mmap+0x3c6/0x6f0 mm/mmap.c:3170 __mmput+0x111/0x3a0 kernel/fork.c:1113 exit_mm+0x211/0x2f0 kernel/exit.c:507 do_exit+0x688/0x24f0 kernel/exit.c:819 do_group_exit+0x168/0x2d0 kernel/exit.c:929 get_signal+0x1740/0x2120 kernel/signal.c:2852 arch_do_signal_or_restart+0x9c/0x730 arch/x86/kernel/signal.c:868 handle_signal_work kernel/entry/common.c:148 [inline] exit_to_user_mode_loop kernel/entry/common.c:172 [inline] exit_to_user_mode_prepare+0x191/0x220 kernel/entry/common.c:207 __syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline] syscall_exit_to_user_mode+0x2e/0x70 kernel/entry/common.c:300 Memory state around the buggy address: ffff88805a4bff80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88805a4c0000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88805a4c0080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88805a4c0100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88805a4c0180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================