================================================================== BUG: KASAN: use-after-free in instrument_atomic_read include/linux/instrumented.h:72 [inline] BUG: KASAN: use-after-free in atomic_read include/linux/atomic/atomic-instrumented.h:27 [inline] BUG: KASAN: use-after-free in refcount_read include/linux/refcount.h:147 [inline] BUG: KASAN: use-after-free in __refcount_add_not_zero include/linux/refcount.h:152 [inline] BUG: KASAN: use-after-free in __refcount_inc_not_zero include/linux/refcount.h:227 [inline] BUG: KASAN: use-after-free in refcount_inc_not_zero include/linux/refcount.h:245 [inline] BUG: KASAN: use-after-free in io_worker_get+0x77/0x2a0 io_uring/io-wq.c:153 Read of size 4 at addr ffff88807dd8f000 by task syz-executor.2/10417 CPU: 1 PID: 10417 Comm: syz-executor.2 Not tainted 6.2.0-rc3-syzkaller-00165-gd9fc1511728c #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2d0 lib/dump_stack.c:106 print_address_description+0x74/0x340 mm/kasan/report.c:306 print_report+0x107/0x220 mm/kasan/report.c:417 kasan_report+0x139/0x170 mm/kasan/report.c:517 kasan_check_range+0x2a7/0x2e0 mm/kasan/generic.c:189 instrument_atomic_read include/linux/instrumented.h:72 [inline] atomic_read include/linux/atomic/atomic-instrumented.h:27 [inline] refcount_read include/linux/refcount.h:147 [inline] __refcount_add_not_zero include/linux/refcount.h:152 [inline] __refcount_inc_not_zero include/linux/refcount.h:227 [inline] refcount_inc_not_zero include/linux/refcount.h:245 [inline] io_worker_get+0x77/0x2a0 io_uring/io-wq.c:153 io_wq_for_each_worker io_uring/io-wq.c:846 [inline] io_wq_exit_workers io_uring/io-wq.c:1250 [inline] io_wq_put_and_exit+0x2f8/0xcb0 io_uring/io-wq.c:1289 io_uring_clean_tctx+0x164/0x1d0 io_uring/tctx.c:193 io_uring_cancel_generic+0x60e/0x670 io_uring/io_uring.c:3145 io_uring_files_cancel include/linux/io_uring.h:55 [inline] do_exit+0x2ad/0x2150 kernel/exit.c:822 do_group_exit+0x1fd/0x2b0 kernel/exit.c:1012 get_signal+0x1755/0x1820 kernel/signal.c:2859 arch_do_signal_or_restart+0x8d/0x5f0 arch/x86/kernel/signal.c:306 exit_to_user_mode_loop+0x74/0x160 kernel/entry/common.c:168 exit_to_user_mode_prepare+0xad/0x110 kernel/entry/common.c:203 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline] syscall_exit_to_user_mode+0x2e/0x60 kernel/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f2c2328c0c9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f2c24076168 EFLAGS: 00000246 ORIG_RAX: 00000000000001aa RAX: 00000000000002ff RBX: 00007f2c233abf80 RCX: 00007f2c2328c0c9 RDX: 0000000000000000 RSI: 00000000000002ff RDI: 0000000000000003 RBP: 00007f2c232e7ae9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffff530fbef R14: 00007f2c24076300 R15: 0000000000022000 Allocated by task 10417: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4c/0x70 mm/kasan/common.c:52 ____kasan_kmalloc mm/kasan/common.c:371 [inline] __kasan_kmalloc+0x97/0xb0 mm/kasan/common.c:380 kmalloc_node include/linux/slab.h:606 [inline] kzalloc_node include/linux/slab.h:731 [inline] create_io_worker+0xef/0x630 io_uring/io-wq.c:801 io_wqe_create_worker io_uring/io-wq.c:310 [inline] io_wqe_enqueue+0x9f3/0xd10 io_uring/io-wq.c:936 io_queue_iowq+0x2ac/0x3a0 io_uring/io_uring.c:475 io_submit_sqe io_uring/io_uring.c:2281 [inline] io_submit_sqes+0x10b9/0x1ba0 io_uring/io_uring.c:2397 __do_sys_io_uring_enter io_uring/io_uring.c:3345 [inline] __se_sys_io_uring_enter+0x335/0x2540 io_uring/io_uring.c:3277 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Freed by task 10417: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4c/0x70 mm/kasan/common.c:52 kasan_save_free_info+0x27/0x40 mm/kasan/generic.c:518 ____kasan_slab_free+0xd6/0x120 mm/kasan/common.c:236 kasan_slab_free include/linux/kasan.h:177 [inline] slab_free_hook mm/slub.c:1781 [inline] slab_free_freelist_hook+0x12e/0x1a0 mm/slub.c:1807 slab_free mm/slub.c:3787 [inline] __kmem_cache_free+0x71/0x110 mm/slub.c:3800 io_wq_cancel_tw_create io_uring/io-wq.c:1233 [inline] io_wq_exit_workers io_uring/io-wq.c:1244 [inline] io_wq_put_and_exit+0x137/0xcb0 io_uring/io-wq.c:1289 io_uring_clean_tctx+0x164/0x1d0 io_uring/tctx.c:193 io_uring_cancel_generic+0x60e/0x670 io_uring/io_uring.c:3145 io_uring_files_cancel include/linux/io_uring.h:55 [inline] do_exit+0x2ad/0x2150 kernel/exit.c:822 do_group_exit+0x1fd/0x2b0 kernel/exit.c:1012 get_signal+0x1755/0x1820 kernel/signal.c:2859 arch_do_signal_or_restart+0x8d/0x5f0 arch/x86/kernel/signal.c:306 exit_to_user_mode_loop+0x74/0x160 kernel/entry/common.c:168 exit_to_user_mode_prepare+0xad/0x110 kernel/entry/common.c:203 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline] syscall_exit_to_user_mode+0x2e/0x60 kernel/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x63/0xcd Last potentially related work creation: kasan_save_stack+0x3b/0x60 mm/kasan/common.c:45 __kasan_record_aux_stack+0xb0/0xc0 mm/kasan/generic.c:488 task_work_add+0x87/0x340 kernel/task_work.c:48 io_queue_worker_create+0x1e2/0x430 io_uring/io-wq.c:373 sched_submit_work kernel/sched/core.c:6648 [inline] schedule+0x63/0x190 kernel/sched/core.c:6679 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6741 __mutex_lock_common+0xecf/0x26c0 kernel/locking/mutex.c:679 __mutex_lock kernel/locking/mutex.c:747 [inline] mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:799 io_ring_submit_lock io_uring/io_uring.h:215 [inline] io_file_get_fixed+0x6a/0x3f0 io_uring/io_uring.c:1966 io_assign_file io_uring/io_uring.c:1834 [inline] io_wq_submit_work+0x334/0x9c0 io_uring/io_uring.c:1916 io_worker_handle_work+0x8e1/0xee0 io_uring/io-wq.c:587 io_wqe_worker+0x36c/0xde0 io_uring/io-wq.c:632 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 Second to last potentially related work creation: kasan_save_stack+0x3b/0x60 mm/kasan/common.c:45 __kasan_record_aux_stack+0xb0/0xc0 mm/kasan/generic.c:488 insert_work+0x54/0x3e0 kernel/workqueue.c:1358 __queue_work+0xaaa/0xd60 kernel/workqueue.c:1517 call_timer_fn+0xf5/0x210 kernel/time/timer.c:1700 expire_timers kernel/time/timer.c:1746 [inline] __run_timers+0x7a2/0x990 kernel/time/timer.c:2022 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:2035 __do_softirq+0x277/0x75b kernel/softirq.c:571 The buggy address belongs to the object at ffff88807dd8f000 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 0 bytes inside of 512-byte region [ffff88807dd8f000, ffff88807dd8f200) The buggy address belongs to the physical page: page:ffffea0001f76300 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7dd8c head:ffffea0001f76300 order:2 compound_mapcount:0 subpages_mapcount:0 compound_pincount:0 anon flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffff888012841c80 0000000000000000 dead000000000001 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 15, tgid 15 (ksoftirqd/0), ts 184819280147, free_ts 184750821984 prep_new_page mm/page_alloc.c:2531 [inline] get_page_from_freelist+0x72b/0x7a0 mm/page_alloc.c:4283 __alloc_pages+0x259/0x560 mm/page_alloc.c:5549 alloc_slab_page+0xbd/0x190 mm/slub.c:1851 allocate_slab+0x5e/0x3c0 mm/slub.c:1998 new_slab mm/slub.c:2051 [inline] ___slab_alloc+0x7f4/0xeb0 mm/slub.c:3193 __slab_alloc mm/slub.c:3292 [inline] __slab_alloc_node mm/slub.c:3345 [inline] slab_alloc_node mm/slub.c:3442 [inline] __kmem_cache_alloc_node+0x25b/0x340 mm/slub.c:3491 __do_kmalloc_node mm/slab_common.c:967 [inline] __kmalloc_node_track_caller+0x9c/0x190 mm/slab_common.c:988 kmalloc_reserve net/core/skbuff.c:492 [inline] __alloc_skb+0x12c/0x2c0 net/core/skbuff.c:565 skb_copy+0xe8/0x750 net/core/skbuff.c:1779 mac80211_hwsim_tx_frame_no_nl+0x11b1/0x1b00 drivers/net/wireless/mac80211_hwsim.c:1724 mac80211_hwsim_tx_frame+0x1cb/0x220 drivers/net/wireless/mac80211_hwsim.c:2053 mac80211_hwsim_beacon_tx+0x5e1/0xa60 drivers/net/wireless/mac80211_hwsim.c:2116 __iterate_interfaces+0x231/0x4a0 net/mac80211/util.c:799 ieee80211_iterate_active_interfaces_atomic+0x9b/0x120 net/mac80211/util.c:835 mac80211_hwsim_beacon+0xc8/0x1d0 drivers/net/wireless/mac80211_hwsim.c:2142 __run_hrtimer kernel/time/hrtimer.c:1685 [inline] __hrtimer_run_queues+0x50b/0xa60 kernel/time/hrtimer.c:1749 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1446 [inline] free_pcp_prepare+0x751/0x780 mm/page_alloc.c:1496 free_unref_page_prepare mm/page_alloc.c:3369 [inline] free_unref_page+0x19/0x4c0 mm/page_alloc.c:3464 __stack_depot_save+0x430/0x4a0 lib/stackdepot.c:506 kasan_save_stack mm/kasan/common.c:46 [inline] kasan_set_track+0x61/0x70 mm/kasan/common.c:52 kasan_save_free_info+0x27/0x40 mm/kasan/generic.c:518 ____kasan_slab_free+0xd6/0x120 mm/kasan/common.c:236 kasan_slab_free include/linux/kasan.h:177 [inline] slab_free_hook mm/slub.c:1781 [inline] slab_free_freelist_hook+0x12e/0x1a0 mm/slub.c:1807 slab_free mm/slub.c:3787 [inline] kmem_cache_free+0x94/0x1d0 mm/slub.c:3809 mb_cache_entry_create+0x4ea/0x7e0 fs/mbcache.c:111 ext4_xattr_block_cache_insert fs/ext4/xattr.c:2976 [inline] ext4_xattr_block_get fs/ext4/xattr.c:554 [inline] ext4_xattr_get+0x325/0x7f0 fs/ext4/xattr.c:669 __vfs_getxattr+0x476/0x4b0 fs/xattr.c:425 cap_inode_need_killpriv+0x41/0x60 security/commoncap.c:301 security_inode_need_killpriv+0x50/0xb0 security/security.c:1492 dentry_needs_remove_privs fs/inode.c:1967 [inline] __file_remove_privs+0x237/0x620 fs/inode.c:1998 file_modified_flags+0x119/0x700 fs/inode.c:2117 ext4_write_checks+0x249/0x2c0 fs/ext4/file.c:264 Memory state around the buggy address: ffff88807dd8ef00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88807dd8ef80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88807dd8f000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88807dd8f080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88807dd8f100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================