================================================================== 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 ffff88802de74808 by task iou-sqp-10587/10596 CPU: 1 PID: 10596 Comm: iou-sqp-10587 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 10587: 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 10587: 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 The buggy address belongs to the object at ffff88802de74800 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 8 bytes inside of 1024-byte region [ffff88802de74800, ffff88802de74c00) The buggy address belongs to the page: page:000000005d265e28 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2de70 head:000000005d265e28 order:3 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head) raw: 00fff00000010200 0000000000000000 0000000100000001 ffff888010841dc0 raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88802de74700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88802de74780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88802de74800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88802de74880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88802de74900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================