========================= WARNING: held lock freed! 5.2.0+ #70 Not tainted ------------------------- syz-executor.3/28408 is freeing memory ffff8880a53acb80-ffff8880a53ad37f, with a lock still held there! 000000000d8b82e5 (sk_lock-AF_NETROM){+.+.}, at: lock_sock /./include/net/sock.h:1522 [inline] 000000000d8b82e5 (sk_lock-AF_NETROM){+.+.}, at: nr_release+0x130/0x3e0 /net/netrom/af_netrom.c:522 2 locks held by syz-executor.3/28408: #0: 000000005274d567 (&sb->s_type->i_mutex_key#12){+.+.}, at: inode_lock /./include/linux/fs.h:778 [inline] #0: 000000005274d567 (&sb->s_type->i_mutex_key#12){+.+.}, at: __sock_release+0x89/0x280 /net/socket.c:589 #1: 000000000d8b82e5 (sk_lock-AF_NETROM){+.+.}, at: lock_sock /./include/net/sock.h:1522 [inline] #1: 000000000d8b82e5 (sk_lock-AF_NETROM){+.+.}, at: nr_release+0x130/0x3e0 /net/netrom/af_netrom.c:522 stack backtrace: CPU: 1 PID: 28408 Comm: syz-executor.3 Not tainted 5.2.0+ #70 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack /lib/dump_stack.c:77 [inline] dump_stack+0x172/0x1f0 /lib/dump_stack.c:113 print_freed_lock_bug /kernel/locking/lockdep.c:5185 [inline] debug_check_no_locks_freed.cold+0x9d/0xa9 /kernel/locking/lockdep.c:5218 kfree+0xec/0x2c0 /mm/slab.c:3753 sk_prot_free /net/core/sock.c:1640 [inline] __sk_destruct+0x4f7/0x6e0 /net/core/sock.c:1726 sk_destruct+0x86/0xa0 /net/core/sock.c:1734 __sk_free+0xfb/0x360 /net/core/sock.c:1745 sk_free+0x42/0x50 /net/core/sock.c:1756 sock_put /./include/net/sock.h:1725 [inline] nr_destroy_socket+0x3ea/0x4a0 /net/netrom/af_netrom.c:288 nr_release+0x347/0x3e0 /net/netrom/af_netrom.c:530 __sock_release+0xce/0x280 /net/socket.c:590 sock_close+0x1e/0x30 /net/socket.c:1268 __fput+0x2ff/0x890 /fs/file_table.c:280 ____fput+0x16/0x20 /fs/file_table.c:313 task_work_run+0x145/0x1c0 /kernel/task_work.c:113 exit_task_work /./include/linux/task_work.h:22 [inline] do_exit+0x92f/0x2ea0 /kernel/exit.c:877 do_group_exit+0x135/0x360 /kernel/exit.c:981 get_signal+0x47c/0x2500 /kernel/signal.c:2728 do_signal+0x87/0x1700 /arch/x86/kernel/signal.c:815 exit_to_usermode_loop+0x286/0x380 /arch/x86/entry/common.c:159 prepare_exit_to_usermode /arch/x86/entry/common.c:194 [inline] syscall_return_slowpath /arch/x86/entry/common.c:274 [inline] do_syscall_64+0x5a9/0x6a0 /arch/x86/entry/common.c:299 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x459819 Code: fd b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 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 0f 83 cb b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f8710e57cf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 000000000075bfd0 RCX: 0000000000459819 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000075bfd0 RBP: 000000000075bfc8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000075bfd4 R13: 00007ffced8749df R14: 00007f8710e589c0 R15: 000000000075bfd4 ================================================================== BUG: KASAN: use-after-free in debug_spin_lock_before /kernel/locking/spinlock_debug.c:83 [inline] BUG: KASAN: use-after-free in do_raw_spin_lock+0x28a/0x2e0 /kernel/locking/spinlock_debug.c:112 Read of size 4 at addr ffff8880a53acc0c by task syz-executor.3/28408 CPU: 0 PID: 28408 Comm: syz-executor.3 Not tainted 5.2.0+ #70 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack /lib/dump_stack.c:77 [inline] dump_stack+0x172/0x1f0 /lib/dump_stack.c:113 print_address_description.cold+0xd4/0x306 /mm/kasan/report.c:351 __kasan_report.cold+0x1b/0x36 /mm/kasan/report.c:482 kasan_report+0x12/0x17 /mm/kasan/common.c:612 __asan_report_load4_noabort+0x14/0x20 /mm/kasan/generic_report.c:131 debug_spin_lock_before /kernel/locking/spinlock_debug.c:83 [inline] do_raw_spin_lock+0x28a/0x2e0 /kernel/locking/spinlock_debug.c:112 __raw_spin_lock_bh /./include/linux/spinlock_api_smp.h:136 [inline] _raw_spin_lock_bh+0x3b/0x50 /kernel/locking/spinlock.c:175 spin_lock_bh /./include/linux/spinlock.h:343 [inline] release_sock+0x20/0x1c0 /net/core/sock.c:2932 nr_release+0x303/0x3e0 /net/netrom/af_netrom.c:553 __sock_release+0xce/0x280 /net/socket.c:590 sock_close+0x1e/0x30 /net/socket.c:1268 __fput+0x2ff/0x890 /fs/file_table.c:280 ____fput+0x16/0x20 /fs/file_table.c:313 task_work_run+0x145/0x1c0 /kernel/task_work.c:113 exit_task_work /./include/linux/task_work.h:22 [inline] do_exit+0x92f/0x2ea0 /kernel/exit.c:877 do_group_exit+0x135/0x360 /kernel/exit.c:981 get_signal+0x47c/0x2500 /kernel/signal.c:2728 do_signal+0x87/0x1700 /arch/x86/kernel/signal.c:815 exit_to_usermode_loop+0x286/0x380 /arch/x86/entry/common.c:159 prepare_exit_to_usermode /arch/x86/entry/common.c:194 [inline] syscall_return_slowpath /arch/x86/entry/common.c:274 [inline] do_syscall_64+0x5a9/0x6a0 /arch/x86/entry/common.c:299 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x459819 Code: fd b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 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 0f 83 cb b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f8710e57cf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 000000000075bfd0 RCX: 0000000000459819 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000075bfd0 RBP: 000000000075bfc8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000075bfd4 R13: 00007ffced8749df R14: 00007f8710e589c0 R15: 000000000075bfd4 Allocated by task 28404: save_stack+0x23/0x90 /mm/kasan/common.c:69 set_track /mm/kasan/common.c:77 [inline] __kasan_kmalloc /mm/kasan/common.c:487 [inline] __kasan_kmalloc.constprop.0+0xcf/0xe0 /mm/kasan/common.c:460 kasan_kmalloc+0x9/0x10 /mm/kasan/common.c:501 __do_kmalloc /mm/slab.c:3655 [inline] __kmalloc+0x163/0x770 /mm/slab.c:3664 kmalloc /./include/linux/slab.h:557 [inline] sk_prot_alloc+0x23a/0x310 /net/core/sock.c:1603 sk_alloc+0x39/0xf70 /net/core/sock.c:1657 nr_make_new /net/netrom/af_netrom.c:476 [inline] nr_rx_frame+0x733/0x1e73 /net/netrom/af_netrom.c:959 nr_loopback_timer+0x7b/0x170 /net/netrom/nr_loopback.c:59 call_timer_fn+0x1ac/0x780 /kernel/time/timer.c:1322 expire_timers /kernel/time/timer.c:1366 [inline] __run_timers /kernel/time/timer.c:1685 [inline] __run_timers /kernel/time/timer.c:1653 [inline] run_timer_softirq+0x697/0x17a0 /kernel/time/timer.c:1698 __do_softirq+0x262/0x98c /kernel/softirq.c:292 Freed by task 28408: save_stack+0x23/0x90 /mm/kasan/common.c:69 set_track /mm/kasan/common.c:77 [inline] __kasan_slab_free+0x102/0x150 /mm/kasan/common.c:449 kasan_slab_free+0xe/0x10 /mm/kasan/common.c:457 __cache_free /mm/slab.c:3425 [inline] kfree+0x10a/0x2c0 /mm/slab.c:3756 sk_prot_free /net/core/sock.c:1640 [inline] __sk_destruct+0x4f7/0x6e0 /net/core/sock.c:1726 sk_destruct+0x86/0xa0 /net/core/sock.c:1734 __sk_free+0xfb/0x360 /net/core/sock.c:1745 sk_free+0x42/0x50 /net/core/sock.c:1756 sock_put /./include/net/sock.h:1725 [inline] nr_destroy_socket+0x3ea/0x4a0 /net/netrom/af_netrom.c:288 nr_release+0x347/0x3e0 /net/netrom/af_netrom.c:530 __sock_release+0xce/0x280 /net/socket.c:590 sock_close+0x1e/0x30 /net/socket.c:1268 __fput+0x2ff/0x890 /fs/file_table.c:280 ____fput+0x16/0x20 /fs/file_table.c:313 task_work_run+0x145/0x1c0 /kernel/task_work.c:113 exit_task_work /./include/linux/task_work.h:22 [inline] do_exit+0x92f/0x2ea0 /kernel/exit.c:877 do_group_exit+0x135/0x360 /kernel/exit.c:981 get_signal+0x47c/0x2500 /kernel/signal.c:2728 do_signal+0x87/0x1700 /arch/x86/kernel/signal.c:815 exit_to_usermode_loop+0x286/0x380 /arch/x86/entry/common.c:159 prepare_exit_to_usermode /arch/x86/entry/common.c:194 [inline] syscall_return_slowpath /arch/x86/entry/common.c:274 [inline] do_syscall_64+0x5a9/0x6a0 /arch/x86/entry/common.c:299 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff8880a53acb80 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 140 bytes inside of 2048-byte region [ffff8880a53acb80, ffff8880a53ad380) The buggy address belongs to the page: page:ffffea000294eb00 refcount:1 mapcount:0 mapping:ffff8880aa400e00 index:0x0 compound_mapcount: 0 flags: 0x1fffc0000010200(slab|head) raw: 01fffc0000010200 ffffea0002611a88 ffffea00018e5988 ffff8880aa400e00 raw: 0000000000000000 ffff8880a53ac300 0000000100000003 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880a53acb00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880a53acb80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8880a53acc00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880a53acc80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880a53acd00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================