================================================================== 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 ffff88814726b008 by task iou-sqp-20084/20085 CPU: 1 PID: 20085 Comm: iou-sqp-20084 Not tainted 5.12.0-rc2-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+0x141/0x1d7 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+0x11f9/0x1a00 fs/io_uring.c:6773 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 Allocated by task 20084: 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:554 [inline] kzalloc include/linux/slab.h:684 [inline] io_get_sq_data fs/io_uring.c:7177 [inline] io_sq_offload_create fs/io_uring.c:7873 [inline] io_uring_create fs/io_uring.c:9401 [inline] io_uring_setup+0x161f/0x2930 fs/io_uring.c:9484 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae Freed by task 294: 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+0x92/0x210 mm/slub.c:1600 slab_free mm/slub.c:3161 [inline] kfree+0xe5/0x7f0 mm/slub.c:4213 io_put_sq_data fs/io_uring.c:7116 [inline] io_sq_thread_finish+0x50b/0x650 fs/io_uring.c:7139 io_ring_ctx_free fs/io_uring.c:8408 [inline] io_ring_exit_work+0x82/0x9a0 fs/io_uring.c:8539 process_one_work+0x98d/0x1600 kernel/workqueue.c:2275 worker_thread+0x64c/0x1120 kernel/workqueue.c:2421 kthread+0x3b1/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 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+0x10e/0x7d0 kernel/rcu/tree.c:3577 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 geneve_init_module+0x13/0x95 drivers/net/geneve.c:1928 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+0x63e/0x6c2 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 ffff88814726b000 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 8 bytes inside of 1024-byte region [ffff88814726b000, ffff88814726b400) The buggy address belongs to the page: page:00000000a4f37303 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x147268 head:00000000a4f37303 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x57ff00000010200(slab|head) raw: 057ff00000010200 ffffea0000a3b800 0000000600000006 ffff888010441dc0 raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88814726af00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88814726af80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88814726b000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88814726b080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88814726b100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================