==================================================================
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 ffff8880903977c0 by task swapper/0/0
CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.3.0-rc2+ #83
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
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+0x1605/0x1e73 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:native_safe_halt+0xe/0x10 arch/x86/include/asm/irqflags.h:61
Code: 98 1c 6f fa eb 8a 90 90 90 90 90 90 e9 07 00 00 00 0f 00 2d a4 8d 4a 00 f4 c3 66 90 e9 07 00 00 00 0f 00 2d 94 8d 4a 00 fb f4 90 55 48 89 e5 41 57 41 56 41 55 41 54 53 e8 6e d4 22 fa e8 49
RSP: 0018:ffffffff88c07ce8 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13
RAX: 1ffffffff11a5e45 RBX: ffffffff88c7a1c0 RCX: 1ffffffff134b3e6
RDX: dffffc0000000000 RSI: ffffffff81781bae RDI: ffffffff873d8f2c
RBP: ffffffff88c07d18 R08: ffffffff88c7a1c0 R09: fffffbfff118f439
R10: fffffbfff118f438 R11: ffffffff88c7a1c7 R12: dffffc0000000000
R13: ffffffff89a56d38 R14: 0000000000000000 R15: 0000000000000000
arch_cpu_idle+0xa/0x10 arch/x86/kernel/process.c:571
default_idle_call+0x84/0xb0 kernel/sched/idle.c:94
cpuidle_idle_call kernel/sched/idle.c:154 [inline]
do_idle+0x413/0x760 kernel/sched/idle.c:263
cpu_startup_entry+0x1b/0x20 kernel/sched/idle.c:354
rest_init+0x245/0x37b init/main.c:451
arch_call_rest_init+0xe/0x1b
start_kernel+0x912/0x951 init/main.c:785
x86_64_start_reservations+0x29/0x2b arch/x86/kernel/head64.c:472
x86_64_start_kernel+0x77/0x7b arch/x86/kernel/head64.c:453
secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:241
Allocated by task 0:
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 12201:
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/0x250 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+0x56e/0x700 net/netrom/af_netrom.c:819
__sys_accept4+0x34e/0x6a0 net/socket.c:1754
__do_sys_accept net/socket.c:1795 [inline]
__se_sys_accept net/socket.c:1792 [inline]
__x64_sys_accept+0x75/0xb0 net/socket.c:1792
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 ffff888090397740
which belongs to the cache kmalloc-2k of size 2048
The buggy address is located 128 bytes inside of
2048-byte region [ffff888090397740, ffff888090397f40)
The buggy address belongs to the page:
page:ffffea000240e580 refcount:1 mapcount:0 mapping:ffff8880aa400e00 index:0x0 compound_mapcount: 0
flags: 0x1fffc0000010200(slab|head)
raw: 01fffc0000010200 ffffea00021f8588 ffff8880aa401948 ffff8880aa400e00
raw: 0000000000000000 ffff888090396640 0000000100000003 0000000000000000
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff888090397680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff888090397700: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb
>ffff888090397780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff888090397800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888090397880: 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: 0 at lib/debugobjects.c:481 debug_print_object+0x168/0x250 lib/debugobjects.c:481
Modules linked in:
CPU: 0 PID: 0 Comm: swapper/0 Tainted: G B 5.3.0-rc2+ #83
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:debug_print_object+0x168/0x250 lib/debugobjects.c:481
Code: dd a0 31 c6 87 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 b5 00 00 00 48 8b 14 dd a0 31 c6 87 48 c7 c7 a0 26 c6 87 e8 40 c2 05 fe <0f> 0b 83 05 53 55 67 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: ffffffff815c5216 RDI: ffffed1015d0132c
RBP: ffff8880ae809a10 R08: ffffffff88c7a1c0 R09: fffffbfff134ada8
R10: fffffbfff134ada7 R11: ffffffff89a56d3f R12: 0000000000000001
R13: ffffffff88db6560 R14: ffffffff8161f080 R15: 1ffff11015d01348
FS: 0000000000000000(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000002 CR3: 000000008a54e000 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/0x1e73 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:native_safe_halt+0xe/0x10 arch/x86/include/asm/irqflags.h:61
Code: 98 1c 6f fa eb 8a 90 90 90 90 90 90 e9 07 00 00 00 0f 00 2d a4 8d 4a 00 f4 c3 66 90 e9 07 00 00 00 0f 00 2d 94 8d 4a 00 fb f4 90 55 48 89 e5 41 57 41 56 41 55 41 54 53 e8 6e d4 22 fa e8 49
RSP: 0018:ffffffff88c07ce8 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13
RAX: 1ffffffff11a5e45 RBX: ffffffff88c7a1c0 RCX: 1ffffffff134b3e6
RDX: dffffc0000000000 RSI: ffffffff81781bae RDI: ffffffff873d8f2c
RBP: ffffffff88c07d18 R08: ffffffff88c7a1c0 R09: fffffbfff118f439
R10: fffffbfff118f438 R11: ffffffff88c7a1c7 R12: dffffc0000000000
R13: ffffffff89a56d38 R14: 0000000000000000 R15: 0000000000000000
arch_cpu_idle+0xa/0x10 arch/x86/kernel/process.c:571
default_idle_call+0x84/0xb0 kernel/sched/idle.c:94
cpuidle_idle_call kernel/sched/idle.c:154 [inline]
do_idle+0x413/0x760 kernel/sched/idle.c:263
cpu_startup_entry+0x1b/0x20 kernel/sched/idle.c:354
rest_init+0x245/0x37b init/main.c:451
arch_call_rest_init+0xe/0x1b
start_kernel+0x912/0x951 init/main.c:785
x86_64_start_reservations+0x29/0x2b arch/x86/kernel/head64.c:472
x86_64_start_kernel+0x77/0x7b arch/x86/kernel/head64.c:453
secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:241
irq event stamp: 94930
hardirqs last enabled at (94929): [] tick_nohz_idle_exit+0x181/0x2e0 kernel/time/tick-sched.c:1180
hardirqs last disabled at (94930): [] __schedule+0x1dd/0x1580 kernel/sched/core.c:3821
softirqs last enabled at (93544): [] __do_softirq+0x6cd/0x98c kernel/softirq.c:319
softirqs last disabled at (93365): [] invoke_softirq kernel/softirq.c:373 [inline]
softirqs last disabled at (93365): [] irq_exit+0x19b/0x1e0 kernel/softirq.c:413
---[ end trace 8a169c3594237260 ]---