========================= WARNING: held lock freed! 5.2.0-rc6+ #75 Not tainted ------------------------- syz-executor315/8559 is freeing memory ffff88809faed2c0-ffff88809faedabf, with a lock still held there! 00000000cf45dbdb (sk_lock-AF_NETROM){+.+.}, at: lock_sock include/net/sock.h:1522 [inline] 00000000cf45dbdb (sk_lock-AF_NETROM){+.+.}, at: nr_release+0x11a/0x3b0 net/netrom/af_netrom.c:522 2 locks held by syz-executor315/8559: #0: 00000000c0a19dcd (&sb->s_type->i_mutex_key#11){+.+.}, at: inode_lock include/linux/fs.h:778 [inline] #0: 00000000c0a19dcd (&sb->s_type->i_mutex_key#11){+.+.}, at: __sock_release+0x89/0x2a0 net/socket.c:600 #1: 00000000cf45dbdb (sk_lock-AF_NETROM){+.+.}, at: lock_sock include/net/sock.h:1522 [inline] #1: 00000000cf45dbdb (sk_lock-AF_NETROM){+.+.}, at: nr_release+0x11a/0x3b0 net/netrom/af_netrom.c:522 stack backtrace: CPU: 0 PID: 8559 Comm: syz-executor315 Not tainted 5.2.0-rc6+ #75 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:5077 [inline] debug_check_no_locks_freed.cold+0x9d/0xa9 kernel/locking/lockdep.c:5110 kfree+0xb1/0x220 mm/slab.c:3752 sk_prot_free net/core/sock.c:1636 [inline] __sk_destruct+0x4f7/0x6e0 net/core/sock.c:1722 sk_destruct+0x7b/0x90 net/core/sock.c:1730 __sk_free+0xce/0x300 net/core/sock.c:1741 sk_free+0x42/0x50 net/core/sock.c:1752 sock_put include/net/sock.h:1725 [inline] nr_destroy_socket+0x3df/0x4a0 net/netrom/af_netrom.c:288 nr_release+0x323/0x3b0 net/netrom/af_netrom.c:530 __sock_release+0xce/0x2a0 net/socket.c:601 sock_close+0x1b/0x30 net/socket.c:1273 __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 tracehook_notify_resume include/linux/tracehook.h:185 [inline] exit_to_usermode_loop+0x273/0x2c0 arch/x86/entry/common.c:168 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline] syscall_return_slowpath arch/x86/entry/common.c:279 [inline] do_syscall_64+0x58e/0x680 arch/x86/entry/common.c:304 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x447269 Code: e8 7c 14 03 00 48 83 c4 18 c3 0f 1f 80 00 00 00 00 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 0e fc ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f653a7bed88 EFLAGS: 00000246 ORIG_RAX: 000000000000002d RAX: ffffffffffffff95 RBX: 00000000006dcc48 RCX: 0000000000447269 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003 RBP: 00000000006dcc40 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dcc4c R13: 0000003066736362 R14: 002cc7eb47000000 R15: 0000003066736362 ================================================================== 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 ffff88809faed34c by task syz-executor315/8559 CPU: 1 PID: 8559 Comm: syz-executor315 Not tainted 5.2.0-rc6+ #75 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+0x7c/0x20d mm/kasan/report.c:188 __kasan_report.cold+0x1b/0x40 mm/kasan/report.c:317 kasan_report+0x12/0x20 mm/kasan/common.c:614 __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:2928 nr_release+0x2df/0x3b0 net/netrom/af_netrom.c:553 __sock_release+0xce/0x2a0 net/socket.c:601 sock_close+0x1b/0x30 net/socket.c:1273 __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 tracehook_notify_resume include/linux/tracehook.h:185 [inline] exit_to_usermode_loop+0x273/0x2c0 arch/x86/entry/common.c:168 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline] syscall_return_slowpath arch/x86/entry/common.c:279 [inline] do_syscall_64+0x58e/0x680 arch/x86/entry/common.c:304 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x447269 Code: e8 7c 14 03 00 48 83 c4 18 c3 0f 1f 80 00 00 00 00 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 0e fc ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f653a7bed88 EFLAGS: 00000246 ORIG_RAX: 000000000000002d RAX: ffffffffffffff95 RBX: 00000000006dcc48 RCX: 0000000000447269 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003 RBP: 00000000006dcc40 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dcc4c R13: 0000003066736362 R14: 002cc7eb47000000 R15: 0000003066736362 Allocated by task 8562: save_stack+0x23/0x90 mm/kasan/common.c:71 set_track mm/kasan/common.c:79 [inline] __kasan_kmalloc mm/kasan/common.c:489 [inline] __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:462 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:503 __do_kmalloc mm/slab.c:3660 [inline] __kmalloc+0x15c/0x740 mm/slab.c:3669 kmalloc include/linux/slab.h:552 [inline] sk_prot_alloc+0x19c/0x2e0 net/core/sock.c:1599 sk_alloc+0x39/0xf70 net/core/sock.c:1653 nr_make_new net/netrom/af_netrom.c:476 [inline] nr_rx_frame+0x733/0x1e70 net/netrom/af_netrom.c:959 nr_loopback_timer+0x7b/0x170 net/netrom/nr_loopback.c:59 call_timer_fn+0x193/0x720 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+0x66f/0x1740 kernel/time/timer.c:1698 __do_softirq+0x25c/0x94c kernel/softirq.c:292 Freed by task 8559: save_stack+0x23/0x90 mm/kasan/common.c:71 set_track mm/kasan/common.c:79 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/common.c:451 kasan_slab_free+0xe/0x10 mm/kasan/common.c:459 __cache_free mm/slab.c:3432 [inline] kfree+0xcf/0x220 mm/slab.c:3755 sk_prot_free net/core/sock.c:1636 [inline] __sk_destruct+0x4f7/0x6e0 net/core/sock.c:1722 sk_destruct+0x7b/0x90 net/core/sock.c:1730 __sk_free+0xce/0x300 net/core/sock.c:1741 sk_free+0x42/0x50 net/core/sock.c:1752 sock_put include/net/sock.h:1725 [inline] nr_destroy_socket+0x3df/0x4a0 net/netrom/af_netrom.c:288 nr_release+0x323/0x3b0 net/netrom/af_netrom.c:530 __sock_release+0xce/0x2a0 net/socket.c:601 sock_close+0x1b/0x30 net/socket.c:1273 __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 tracehook_notify_resume include/linux/tracehook.h:185 [inline] exit_to_usermode_loop+0x273/0x2c0 arch/x86/entry/common.c:168 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline] syscall_return_slowpath arch/x86/entry/common.c:279 [inline] do_syscall_64+0x58e/0x680 arch/x86/entry/common.c:304 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff88809faed2c0 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 140 bytes inside of 2048-byte region [ffff88809faed2c0, ffff88809faedac0) The buggy address belongs to the page: page:ffffea00027ebb00 refcount:1 mapcount:0 mapping:ffff8880aa400c40 index:0x0 compound_mapcount: 0 flags: 0x1fffc0000010200(slab|head) raw: 01fffc0000010200 ffffea000242cd08 ffffea00023df908 ffff8880aa400c40 raw: 0000000000000000 ffff88809faec1c0 0000000100000003 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88809faed200: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff88809faed280: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb >ffff88809faed300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88809faed380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88809faed400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================