========================= WARNING: held lock freed! 5.2.0+ #35 Not tainted ------------------------- syz-executor619/8354 is freeing memory ffff88809309a140-ffff88809309a93f, with a lock still held there! 00000000bd3d25ac (sk_lock-AF_NETROM){+.+.}, at: lock_sock /./include/net/sock.h:1522 [inline] 00000000bd3d25ac (sk_lock-AF_NETROM){+.+.}, at: nr_release+0xfe/0x390 /net/netrom/af_netrom.c:522 2 locks held by syz-executor619/8354: #0: 0000000044454227 (&sb->s_type->i_mutex_key#11){+.+.}, at: inode_lock /./include/linux/fs.h:778 [inline] #0: 0000000044454227 (&sb->s_type->i_mutex_key#11){+.+.}, at: __sock_release /net/socket.c:585 [inline] #0: 0000000044454227 (&sb->s_type->i_mutex_key#11){+.+.}, at: sock_close+0x9e/0x260 /net/socket.c:1264 #1: 00000000bd3d25ac (sk_lock-AF_NETROM){+.+.}, at: lock_sock /./include/net/sock.h:1522 [inline] #1: 00000000bd3d25ac (sk_lock-AF_NETROM){+.+.}, at: nr_release+0xfe/0x390 /net/netrom/af_netrom.c:522 stack backtrace: CPU: 0 PID: 8354 Comm: syz-executor619 Not tainted 5.2.0+ #35 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+0x1d8/0x2f8 /lib/dump_stack.c:113 print_freed_lock_bug /kernel/locking/lockdep.c:5185 [inline] debug_check_no_locks_freed+0x813/0x990 /kernel/locking/lockdep.c:5218 kfree+0xfb/0x200 /mm/slab.c:3753 sk_prot_free /net/core/sock.c:1640 [inline] __sk_destruct+0x567/0x660 /net/core/sock.c:1726 sk_destruct /net/core/sock.c:1734 [inline] __sk_free+0x317/0x3e0 /net/core/sock.c:1745 sk_free+0x2a/0x40 /net/core/sock.c:1756 sock_put /./include/net/sock.h:1725 [inline] nr_destroy_socket+0x3e3/0x460 /net/netrom/af_netrom.c:288 nr_release+0x191/0x390 /net/netrom/af_netrom.c:530 __sock_release /net/socket.c:586 [inline] sock_close+0xe1/0x260 /net/socket.c:1264 __fput+0x2e4/0x740 /fs/file_table.c:280 ____fput+0x15/0x20 /fs/file_table.c:313 task_work_run+0x17e/0x1b0 /kernel/task_work.c:113 exit_task_work /./include/linux/task_work.h:22 [inline] do_exit+0x64c/0x2310 /kernel/exit.c:877 do_group_exit+0x15c/0x2b0 /kernel/exit.c:981 get_signal+0x51c/0x1dd0 /kernel/signal.c:2728 do_signal+0x7b/0x720 /arch/x86/kernel/signal.c:815 exit_to_usermode_loop /arch/x86/entry/common.c:159 [inline] prepare_exit_to_usermode+0x303/0x580 /arch/x86/entry/common.c:194 syscall_return_slowpath+0x113/0x4a0 /arch/x86/entry/common.c:274 do_syscall_64+0x126/0x140 /arch/x86/entry/common.c:299 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x444839 Code: Bad RIP value. RSP: 002b:00007ffdd7374068 EFLAGS: 00000246 ORIG_RAX: 000000000000002b RAX: 0000000000000003 RBX: 0000000000000004 RCX: 0000000000444839 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004 RBP: 0000000000000003 R08: 0000000000000004 R09: 0000000000000004 R10: 0000000000000004 R11: 0000000000000246 R12: 0000555556c17914 R13: 0000000000000013 R14: 0000000000000000 R15: 0000000000000000 ================================================================== 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+0x295/0x3a0 /kernel/locking/spinlock_debug.c:112 Read of size 4 at addr ffff88809309a1cc by task syz-executor619/8354 CPU: 0 PID: 8354 Comm: syz-executor619 Not tainted 5.2.0+ #35 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+0x1d8/0x2f8 /lib/dump_stack.c:113 print_address_description+0x75/0x5b0 /mm/kasan/report.c:351 __kasan_report+0x14b/0x1c0 /mm/kasan/report.c:482 kasan_report+0x26/0x50 /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+0x295/0x3a0 /kernel/locking/spinlock_debug.c:112 __raw_spin_lock_bh /./include/linux/spinlock_api_smp.h:136 [inline] _raw_spin_lock_bh+0x40/0x50 /kernel/locking/spinlock.c:175 spin_lock_bh /./include/linux/spinlock.h:343 [inline] release_sock+0x30/0x1d0 /net/core/sock.c:2932 nr_release+0x1b9/0x390 /net/netrom/af_netrom.c:553 __sock_release /net/socket.c:586 [inline] sock_close+0xe1/0x260 /net/socket.c:1264 __fput+0x2e4/0x740 /fs/file_table.c:280 ____fput+0x15/0x20 /fs/file_table.c:313 task_work_run+0x17e/0x1b0 /kernel/task_work.c:113 exit_task_work /./include/linux/task_work.h:22 [inline] do_exit+0x64c/0x2310 /kernel/exit.c:877 do_group_exit+0x15c/0x2b0 /kernel/exit.c:981 get_signal+0x51c/0x1dd0 /kernel/signal.c:2728 do_signal+0x7b/0x720 /arch/x86/kernel/signal.c:815 exit_to_usermode_loop /arch/x86/entry/common.c:159 [inline] prepare_exit_to_usermode+0x303/0x580 /arch/x86/entry/common.c:194 syscall_return_slowpath+0x113/0x4a0 /arch/x86/entry/common.c:274 do_syscall_64+0x126/0x140 /arch/x86/entry/common.c:299 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x444839 Code: Bad RIP value. RSP: 002b:00007ffdd7374068 EFLAGS: 00000246 ORIG_RAX: 000000000000002b RAX: 0000000000000003 RBX: 0000000000000004 RCX: 0000000000444839 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004 RBP: 0000000000000003 R08: 0000000000000004 R09: 0000000000000004 R10: 0000000000000004 R11: 0000000000000246 R12: 0000555556c17914 R13: 0000000000000013 R14: 0000000000000000 R15: 0000000000000000 Allocated by task 8363: save_stack /mm/kasan/common.c:69 [inline] set_track /mm/kasan/common.c:77 [inline] __kasan_kmalloc+0x11c/0x1b0 /mm/kasan/common.c:487 kasan_kmalloc+0x9/0x10 /mm/kasan/common.c:501 __do_kmalloc /mm/slab.c:3655 [inline] __kmalloc+0x254/0x340 /mm/slab.c:3664 kmalloc /./include/linux/slab.h:557 [inline] sk_prot_alloc+0xb0/0x290 /net/core/sock.c:1603 sk_alloc+0x38/0x950 /net/core/sock.c:1657 nr_make_new /net/netrom/af_netrom.c:476 [inline] nr_rx_frame+0xabc/0x1e40 /net/netrom/af_netrom.c:959 nr_loopback_timer+0x6a/0x140 /net/netrom/nr_loopback.c:59 call_timer_fn+0xec/0x200 /kernel/time/timer.c:1322 expire_timers /kernel/time/timer.c:1366 [inline] __run_timers+0x7cd/0x9c0 /kernel/time/timer.c:1685 run_timer_softirq+0x4a/0x90 /kernel/time/timer.c:1698 __do_softirq+0x333/0x7c4 /./arch/x86/include/asm/paravirt.h:777 Freed by task 8354: save_stack /mm/kasan/common.c:69 [inline] set_track /mm/kasan/common.c:77 [inline] __kasan_slab_free+0x12a/0x1e0 /mm/kasan/common.c:449 kasan_slab_free+0xe/0x10 /mm/kasan/common.c:457 __cache_free /mm/slab.c:3425 [inline] kfree+0x115/0x200 /mm/slab.c:3756 sk_prot_free /net/core/sock.c:1640 [inline] __sk_destruct+0x567/0x660 /net/core/sock.c:1726 sk_destruct /net/core/sock.c:1734 [inline] __sk_free+0x317/0x3e0 /net/core/sock.c:1745 sk_free+0x2a/0x40 /net/core/sock.c:1756 sock_put /./include/net/sock.h:1725 [inline] nr_destroy_socket+0x3e3/0x460 /net/netrom/af_netrom.c:288 nr_release+0x191/0x390 /net/netrom/af_netrom.c:530 __sock_release /net/socket.c:586 [inline] sock_close+0xe1/0x260 /net/socket.c:1264 __fput+0x2e4/0x740 /fs/file_table.c:280 ____fput+0x15/0x20 /fs/file_table.c:313 task_work_run+0x17e/0x1b0 /kernel/task_work.c:113 exit_task_work /./include/linux/task_work.h:22 [inline] do_exit+0x64c/0x2310 /kernel/exit.c:877 do_group_exit+0x15c/0x2b0 /kernel/exit.c:981 get_signal+0x51c/0x1dd0 /kernel/signal.c:2728 do_signal+0x7b/0x720 /arch/x86/kernel/signal.c:815 exit_to_usermode_loop /arch/x86/entry/common.c:159 [inline] prepare_exit_to_usermode+0x303/0x580 /arch/x86/entry/common.c:194 syscall_return_slowpath+0x113/0x4a0 /arch/x86/entry/common.c:274 do_syscall_64+0x126/0x140 /arch/x86/entry/common.c:299 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff88809309a140 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 140 bytes inside of 2048-byte region [ffff88809309a140, ffff88809309a940) The buggy address belongs to the page: page:ffffea00024c2680 refcount:1 mapcount:0 mapping:ffff8880aa400e00 index:0x0 compound_mapcount: 0 flags: 0x1fffc0000010200(slab|head) raw: 01fffc0000010200 ffffea000262ce08 ffffea000229e408 ffff8880aa400e00 raw: 0000000000000000 ffff88809309a140 0000000100000003 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88809309a080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88809309a100: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb >ffff88809309a180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88809309a200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88809309a280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================