==================================================================
BUG: KASAN: use-after-free in atomic_read /./include/asm-generic/atomic-instrumented.h:26 [inline]
BUG: KASAN: use-after-free in refcount_inc_not_zero_checked+0x81/0x200 /lib/refcount.c:123
Read of size 4 at addr ffff88806697a6c0 by task kworker/u4:4/2555
CPU: 0 PID: 2555 Comm: kworker/u4:4 Not tainted 5.2.0+ #66
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: netns cleanup_net
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+0x12/0x20 /mm/kasan/common.c:612
check_memory_region_inline /mm/kasan/generic.c:185 [inline]
check_memory_region+0x134/0x1a0 /mm/kasan/generic.c:192
__kasan_check_read+0x11/0x20 /mm/kasan/common.c:92
atomic_read /./include/asm-generic/atomic-instrumented.h:26 [inline]
refcount_inc_not_zero_checked+0x81/0x200 /lib/refcount.c:123
refcount_inc_checked+0x17/0x70 /lib/refcount.c:156
sock_hold /./include/net/sock.h:649 [inline]
sk_add_node /./include/net/sock.h:701 [inline]
nr_insert_socket+0x2d/0xe0 /net/netrom/af_netrom.c:137
nr_rx_frame+0x1605/0x1e80 /net/netrom/af_netrom.c:1023
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
invoke_softirq /kernel/softirq.c:373 [inline]
irq_exit+0x19b/0x1e0 /kernel/softirq.c:413
exiting_irq /./arch/x86/include/asm/apic.h:537 [inline]
smp_apic_timer_interrupt+0x1a3/0x610 /arch/x86/kernel/apic/apic.c:1095
apic_timer_interrupt+0xf/0x20 /arch/x86/entry/entry_64.S:828
RIP: 0010:arch_local_irq_restore /./arch/x86/include/asm/paravirt.h:767 [inline]
RIP: 0010:lock_acquire+0x20b/0x410 /kernel/locking/lockdep.c:4416
Code: 8c 08 00 00 00 00 00 00 48 c1 e8 03 80 3c 10 00 0f 85 d3 01 00 00 48 83 3d e1 2c 7a 07 00 0f 84 53 01 00 00 48 8b 7d c8 57 9d <0f> 1f 44 00 00 48 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f 5d c3 65 8b
RSP: 0018:ffff8880a209fb28 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13
RAX: 1ffffffff11a5ca2 RBX: ffff8880a2090100 RCX: ffffffff815860b0
RDX: dffffc0000000000 RSI: 0000000000000008 RDI: 0000000000000286
RBP: ffff8880a209fb70 R08: 1ffffffff14a2758 R09: fffffbfff14a2759
R10: ffff8880a2090a08 R11: ffff8880a2090100 R12: ffffffff88daaac0
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000002
rcu_lock_acquire /./include/linux/rcupdate.h:208 [inline]
rcu_read_lock /./include/linux/rcupdate.h:592 [inline]
inet_twsk_purge+0xc0/0x5f0 /net/ipv4/inet_timewait_sock.c:268
dccp_v6_exit_batch+0x1a/0x20 /net/dccp/ipv6.c:1113
ops_exit_list.isra.0+0xfc/0x150 /net/core/net_namespace.c:175
cleanup_net+0x4e2/0xa70 /net/core/net_namespace.c:594
process_one_work+0x9af/0x1740 /kernel/workqueue.c:2269
worker_thread+0x98/0xe40 /kernel/workqueue.c:2415
kthread+0x361/0x430 /kernel/kthread.c:255
ret_from_fork+0x24/0x30 /arch/x86/entry/entry_64.S:352
Allocated by task 2555:
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+0x163/0x780 /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+0x733/0x1e80 /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 9548:
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]
sock_efree+0x61/0x80 /net/core/sock.c:2042
skb_release_head_state+0xeb/0x260 /net/core/skbuff.c:652
skb_release_all+0x16/0x60 /net/core/skbuff.c:663
__kfree_skb /net/core/skbuff.c:679 [inline]
kfree_skb /net/core/skbuff.c:697 [inline]
kfree_skb+0x101/0x3c0 /net/core/skbuff.c:691
nr_accept+0x570/0x720 /net/netrom/af_netrom.c:819
__sys_accept4+0x34e/0x6a0 /net/socket.c:1750
__do_sys_accept4 /net/socket.c:1785 [inline]
__se_sys_accept4 /net/socket.c:1782 [inline]
__x64_sys_accept4+0x97/0xf0 /net/socket.c:1782
do_syscall_64+0xfd/0x6a0 /arch/x86/entry/common.c:296
entry_SYSCALL_64_after_hwframe+0x49/0xbe
The buggy address belongs to the object at ffff88806697a640
which belongs to the cache kmalloc-2k of size 2048
The buggy address is located 128 bytes inside of
2048-byte region [ffff88806697a640, ffff88806697ae40)
The buggy address belongs to the page:
page:ffffea00019a5e80 refcount:1 mapcount:0 mapping:ffff8880aa400e00 index:0x0 compound_mapcount: 0
flags: 0x1fffc0000010200(slab|head)
raw: 01fffc0000010200 ffffea00019a5d88 ffffea0002311c88 ffff8880aa400e00
raw: 0000000000000000 ffff88806697a640 0000000100000003 0000000000000000
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff88806697a580: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff88806697a600: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb
>ffff88806697a680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88806697a700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88806697a780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
------------[ cut here ]------------
ODEBUG: activate not available (active state 0) object type: timer_list hint: nr_heartbeat_expiry+0x0/0x410 /net/netrom/nr_timer.c:52
WARNING: CPU: 0 PID: 2555 at lib/debugobjects.c:481 debug_print_object+0x168/0x250 /lib/debugobjects.c:481
Modules linked in:
CPU: 0 PID: 2555 Comm: kworker/u4:4 Tainted: G B 5.2.0+ #66
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: netns cleanup_net
RIP: 0010:debug_print_object+0x168/0x250 /lib/debugobjects.c:481
Code: dd a0 48 c5 87 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 b5 00 00 00 48 8b 14 dd a0 48 c5 87 48 c7 c7 00 3e c5 87 e8 f0 b1 07 fe <0f> 0b 83 05 13 86 66 06 01 48 83 c4 20 5b 41 5c 41 5d 41 5e 5d c3
RSP: 0018:ffff8880ae8099d0 EFLAGS: 00010082
RAX: 0000000000000000 RBX: 0000000000000005 RCX: 0000000000000000
RDX: 0000000000000100 RSI: ffffffff815c1016 RDI: ffffed1015d0132c
RBP: ffff8880ae809a10 R08: ffff8880a2090100 R09: fffffbfff11b3fc9
R10: fffffbfff11b3fc8 R11: ffffffff88d9fe43 R12: 0000000000000001
R13: ffffffff88db4ca0 R14: ffffffff8161a860 R15: 1ffff11015d01348
FS: 0000000000000000(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000075c000 CR3: 00000000a0305000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
debug_object_activate+0x2e5/0x470 /lib/debugobjects.c:680
debug_timer_activate /kernel/time/timer.c:710 [inline]
__mod_timer /kernel/time/timer.c:1035 [inline]
mod_timer+0x452/0xc10 /kernel/time/timer.c:1096
sk_reset_timer+0x24/0x60 /net/core/sock.c:2821
nr_start_heartbeat+0x47/0x60 /net/netrom/nr_timer.c:79
nr_rx_frame+0x160d/0x1e80 /net/netrom/af_netrom.c:1025
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
invoke_softirq /kernel/softirq.c:373 [inline]
irq_exit+0x19b/0x1e0 /kernel/softirq.c:413
exiting_irq /./arch/x86/include/asm/apic.h:537 [inline]
smp_apic_timer_interrupt+0x1a3/0x610 /arch/x86/kernel/apic/apic.c:1095
apic_timer_interrupt+0xf/0x20 /arch/x86/entry/entry_64.S:828
RIP: 0010:arch_local_irq_restore /./arch/x86/include/asm/paravirt.h:767 [inline]
RIP: 0010:lock_acquire+0x20b/0x410 /kernel/locking/lockdep.c:4416
Code: 8c 08 00 00 00 00 00 00 48 c1 e8 03 80 3c 10 00 0f 85 d3 01 00 00 48 83 3d e1 2c 7a 07 00 0f 84 53 01 00 00 48 8b 7d c8 57 9d <0f> 1f 44 00 00 48 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f 5d c3 65 8b
RSP: 0018:ffff8880a209fb28 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13
RAX: 1ffffffff11a5ca2 RBX: ffff8880a2090100 RCX: ffffffff815860b0
RDX: dffffc0000000000 RSI: 0000000000000008 RDI: 0000000000000286
RBP: ffff8880a209fb70 R08: 1ffffffff14a2758 R09: fffffbfff14a2759
R10: ffff8880a2090a08 R11: ffff8880a2090100 R12: ffffffff88daaac0
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000002
rcu_lock_acquire /./include/linux/rcupdate.h:208 [inline]
rcu_read_lock /./include/linux/rcupdate.h:592 [inline]
inet_twsk_purge+0xc0/0x5f0 /net/ipv4/inet_timewait_sock.c:268
dccp_v6_exit_batch+0x1a/0x20 /net/dccp/ipv6.c:1113
ops_exit_list.isra.0+0xfc/0x150 /net/core/net_namespace.c:175
cleanup_net+0x4e2/0xa70 /net/core/net_namespace.c:594
process_one_work+0x9af/0x1740 /kernel/workqueue.c:2269
worker_thread+0x98/0xe40 /kernel/workqueue.c:2415
kthread+0x361/0x430 /kernel/kthread.c:255
ret_from_fork+0x24/0x30 /arch/x86/entry/entry_64.S:352
irq event stamp: 738295
hardirqs last enabled at (738294): [] trace_hardirqs_on_thunk+0x1a/0x1c
hardirqs last disabled at (738295): [] __raw_spin_lock_irqsave /./include/linux/spinlock_api_smp.h:108 [inline]
hardirqs last disabled at (738295): [] _raw_spin_lock_irqsave+0x6f/0xcd /kernel/locking/spinlock.c:159
softirqs last enabled at (738136): [] __do_softirq+0x6cd/0x98c /kernel/softirq.c:319
softirqs last disabled at (738243): [] invoke_softirq /kernel/softirq.c:373 [inline]
softirqs last disabled at (738243): [] irq_exit+0x19b/0x1e0 /kernel/softirq.c:413
---[ end trace aa41c2df35f03a6f ]---