================================================================== BUG: KASAN: use-after-free in __mutex_lock_common kernel/locking/mutex.c:938 [inline] BUG: KASAN: use-after-free in __mutex_lock+0x102f/0x1110 kernel/locking/mutex.c:1103 Read of size 8 at addr ffff88802b8bf3e0 by task syz-executor.2/12430 CPU: 0 PID: 12430 Comm: syz-executor.2 Not tainted 5.10.0-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+0x107/0x163 lib/dump_stack.c:120 print_address_description.constprop.0.cold+0xae/0x4c8 mm/kasan/report.c:385 __kasan_report mm/kasan/report.c:545 [inline] kasan_report.cold+0x1f/0x37 mm/kasan/report.c:562 __mutex_lock_common kernel/locking/mutex.c:938 [inline] __mutex_lock+0x102f/0x1110 kernel/locking/mutex.c:1103 io_ring_ctx_wait_and_kill+0x21/0x450 fs/io_uring.c:8648 io_uring_release+0x3e/0x50 fs/io_uring.c:8687 __fput+0x283/0x920 fs/file_table.c:280 task_work_run+0xdd/0x190 kernel/task_work.c:140 exit_task_work include/linux/task_work.h:30 [inline] do_exit+0xb89/0x2a00 kernel/exit.c:823 do_group_exit+0x125/0x310 kernel/exit.c:920 get_signal+0x3e9/0x2160 kernel/signal.c:2770 arch_do_signal_or_restart+0x2a8/0x1eb0 arch/x86/kernel/signal.c:811 handle_signal_work kernel/entry/common.c:147 [inline] exit_to_user_mode_loop kernel/entry/common.c:171 [inline] exit_to_user_mode_prepare+0x124/0x200 kernel/entry/common.c:201 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline] syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:302 __do_fast_syscall_32+0x62/0x80 arch/x86/entry/common.c:138 do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:160 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c RIP: 0023:0xf7f7d549 Code: Unable to access opcode bytes at RIP 0xf7f7d51f. RSP: 002b:00000000f555607c EFLAGS: 00000286 ORIG_RAX: 00000000000001a9 RAX: fffffffffffffff4 RBX: 0000000000000087 RCX: 0000000020000080 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000020000040 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Allocated by task 12430: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:48 kasan_set_track mm/kasan/common.c:56 [inline] __kasan_kmalloc.constprop.0+0xc2/0xd0 mm/kasan/common.c:461 kmalloc include/linux/slab.h:552 [inline] kzalloc include/linux/slab.h:682 [inline] io_ring_ctx_alloc fs/io_uring.c:1268 [inline] io_uring_create fs/io_uring.c:9480 [inline] io_uring_setup+0x1d5b/0x38b0 fs/io_uring.c:9613 do_syscall_32_irqs_on arch/x86/entry/common.c:78 [inline] __do_fast_syscall_32+0x56/0x80 arch/x86/entry/common.c:137 do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:160 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c Freed by task 22: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:48 kasan_set_track+0x1c/0x30 mm/kasan/common.c:56 kasan_set_free_info+0x1b/0x30 mm/kasan/generic.c:352 __kasan_slab_free+0x102/0x140 mm/kasan/common.c:422 slab_free_hook mm/slub.c:1544 [inline] slab_free_freelist_hook+0x5d/0x150 mm/slub.c:1577 slab_free mm/slub.c:3140 [inline] kfree+0xdb/0x3c0 mm/slub.c:4122 process_one_work+0x98d/0x1630 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:296 Last potentially related work creation: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:48 kasan_record_aux_stack+0xc0/0xf0 mm/kasan/generic.c:343 insert_work+0x48/0x370 kernel/workqueue.c:1331 __queue_work+0x5c1/0xfb0 kernel/workqueue.c:1497 queue_work_on+0xc7/0xd0 kernel/workqueue.c:1524 io_uring_create fs/io_uring.c:9586 [inline] io_uring_setup+0x1358/0x38b0 fs/io_uring.c:9613 do_syscall_32_irqs_on arch/x86/entry/common.c:78 [inline] __do_fast_syscall_32+0x56/0x80 arch/x86/entry/common.c:137 do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:160 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c Second to last potentially related work creation: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:48 kasan_record_aux_stack+0xc0/0xf0 mm/kasan/generic.c:343 __call_rcu kernel/rcu/tree.c:2965 [inline] call_rcu+0xbb/0x710 kernel/rcu/tree.c:3038 put_event kernel/events/core.c:4935 [inline] perf_event_release_kernel+0xa5e/0xe40 kernel/events/core.c:5050 perf_release+0x33/0x40 kernel/events/core.c:5060 __fput+0x283/0x920 fs/file_table.c:280 task_work_run+0xdd/0x190 kernel/task_work.c:140 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop kernel/entry/common.c:174 [inline] exit_to_user_mode_prepare+0x1f0/0x200 kernel/entry/common.c:201 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline] syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:302 __do_fast_syscall_32+0x62/0x80 arch/x86/entry/common.c:138 do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:160 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c The buggy address belongs to the object at ffff88802b8bf000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 992 bytes inside of 2048-byte region [ffff88802b8bf000, ffff88802b8bf800) The buggy address belongs to the page: page:00000000f63c61a9 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2b8b8 head:00000000f63c61a9 order:3 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head) raw: 00fff00000010200 dead000000000100 dead000000000122 ffff888010842000 raw: 0000000000000000 0000000000080008 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88802b8bf280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88802b8bf300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88802b8bf380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88802b8bf400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88802b8bf480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================