================================================================== BUG: KASAN: use-after-free in instrument_atomic_read include/linux/instrumented.h:71 [inline] BUG: KASAN: use-after-free in atomic64_read include/asm-generic/atomic-instrumented.h:837 [inline] BUG: KASAN: use-after-free in atomic_long_read include/asm-generic/atomic-long.h:29 [inline] BUG: KASAN: use-after-free in __mutex_unlock_slowpath+0x8e/0x610 kernel/locking/mutex.c:1227 Read of size 8 at addr ffff88814765a808 by task iou-sqp-10198/10205 CPU: 1 PID: 10205 Comm: iou-sqp-10198 Not tainted 5.12.0-rc1-next-20210304-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0xfa/0x151 lib/dump_stack.c:120 print_address_description.constprop.0.cold+0x5b/0x2f8 mm/kasan/report.c:232 __kasan_report mm/kasan/report.c:399 [inline] kasan_report.cold+0x7c/0xd8 mm/kasan/report.c:416 check_region_inline mm/kasan/generic.c:180 [inline] kasan_check_range+0x13d/0x180 mm/kasan/generic.c:186 instrument_atomic_read include/linux/instrumented.h:71 [inline] atomic64_read include/asm-generic/atomic-instrumented.h:837 [inline] atomic_long_read include/asm-generic/atomic-long.h:29 [inline] __mutex_unlock_slowpath+0x8e/0x610 kernel/locking/mutex.c:1227 io_sq_thread+0x1292/0x1a50 fs/io_uring.c:6766 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 Allocated by task 10198: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:427 [inline] ____kasan_kmalloc mm/kasan/common.c:506 [inline] ____kasan_kmalloc mm/kasan/common.c:465 [inline] __kasan_kmalloc+0x99/0xc0 mm/kasan/common.c:515 kmalloc include/linux/slab.h:556 [inline] kzalloc include/linux/slab.h:686 [inline] io_get_sq_data fs/io_uring.c:7169 [inline] io_sq_offload_create fs/io_uring.c:7863 [inline] io_uring_create fs/io_uring.c:9417 [inline] io_uring_setup+0x1621/0x2950 fs/io_uring.c:9500 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae Freed by task 10198: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_set_track+0x1c/0x30 mm/kasan/common.c:46 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:357 ____kasan_slab_free mm/kasan/common.c:360 [inline] ____kasan_slab_free mm/kasan/common.c:325 [inline] __kasan_slab_free+0xf5/0x130 mm/kasan/common.c:367 kasan_slab_free include/linux/kasan.h:199 [inline] slab_free_hook mm/slub.c:1562 [inline] slab_free_freelist_hook+0x72/0x1b0 mm/slub.c:1600 slab_free mm/slub.c:3161 [inline] kfree+0xe5/0x7b0 mm/slub.c:4215 io_put_sq_data fs/io_uring.c:7108 [inline] io_sq_thread_finish+0x3af/0x480 fs/io_uring.c:7131 io_sq_offload_create fs/io_uring.c:7917 [inline] io_uring_create fs/io_uring.c:9417 [inline] io_uring_setup+0x228f/0x2950 fs/io_uring.c:9500 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae Last potentially related work creation: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_record_aux_stack+0xe5/0x110 mm/kasan/generic.c:345 kvfree_call_rcu+0x74/0x8c0 kernel/rcu/tree.c:3597 net_assign_generic net/core/net_namespace.c:120 [inline] ops_init+0x39e/0x470 net/core/net_namespace.c:134 __register_pernet_operations net/core/net_namespace.c:1131 [inline] register_pernet_operations+0x35a/0x850 net/core/net_namespace.c:1208 register_pernet_subsys+0x25/0x40 net/core/net_namespace.c:1249 bareudp_init_module+0x13/0x62 drivers/net/bareudp.c:795 do_one_initcall+0x103/0x650 init/main.c:1226 do_initcall_level init/main.c:1299 [inline] do_initcalls init/main.c:1315 [inline] do_basic_setup init/main.c:1335 [inline] kernel_init_freeable+0x5ff/0x683 init/main.c:1537 kernel_init+0xd/0x1b8 init/main.c:1424 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 The buggy address belongs to the object at ffff88814765a800 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 8 bytes inside of 1024-byte region [ffff88814765a800, ffff88814765ac00) The buggy address belongs to the page: page:00000000a3f82259 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88814765e800 pfn:0x147658 head:00000000a3f82259 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x57ff00000010200(slab|head) raw: 057ff00000010200 ffffea00051cec08 ffff888140000888 ffff888010841dc0 raw: ffff88814765e800 000000000010000a 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88814765a700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88814765a780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88814765a800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88814765a880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88814765a900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================