================================================================== 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 ffff88801625d0d8 by task kworker/1:5/11828 CPU: 1 PID: 11828 Comm: kworker/1:5 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 18304: 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 18304: 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 ffff88801625d000 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 216 bytes inside of 512-byte region [ffff88801625d000, ffff88801625d200) The buggy address belongs to the page: page:ffffea0000589700 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1625c head:ffffea0000589700 order:2 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffffea00008be600 dead000000000002 ffff888011441c80 raw: 0000000000000000 0000000080100010 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 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 59, ts 3731827811, free_ts 0 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] slab_alloc mm/slub.c:3242 [inline] kmem_cache_alloc_trace+0x28c/0x330 mm/slub.c:3259 kmalloc include/linux/slab.h:590 [inline] kzalloc include/linux/slab.h:724 [inline] alloc_bprm+0x56/0x3b0 fs/exec.c:1503 kernel_execve+0x49/0x9a0 fs/exec.c:1943 call_usermodehelper_exec_async+0x262/0x3b0 kernel/umh.c:112 ret_from_fork+0x1f/0x30 page_owner free stack trace missing Memory state around the buggy address: ffff88801625cf80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88801625d000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88801625d080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88801625d100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88801625d180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================