IPVS: Creating netns size=2552 id=7
IPVS: Creating netns size=2552 id=8
==================================================================
BUG: KASAN: use-after-free in __lock_acquire+0x387e/0x4b50 kernel/locking/lockdep.c:3092
Read of size 8 at addr ffff8801cc0ac4a0 by task syz-executor5/4342

CPU: 1 PID: 4342 Comm: syz-executor5 Not tainted 4.4.112-g3fc4284 #32
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 0000000000000000 dfa31f88588ee932 ffff8801cf2175a0 ffffffff81d054ed
 ffffea0007302a00 ffff8801cc0ac4a0 0000000000000000 ffff8801cc0ac4a0
 0000000000000000 ffff8801cf2175d8 ffffffff814fd953 ffff8801cc0ac4a0
Call Trace:
 [<ffffffff81d054ed>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81d054ed>] dump_stack+0xc1/0x124 lib/dump_stack.c:51
 [<ffffffff814fd953>] print_address_description+0x73/0x260 mm/kasan/report.c:252
 [<ffffffff814fde65>] kasan_report_error mm/kasan/report.c:351 [inline]
 [<ffffffff814fde65>] kasan_report+0x285/0x370 mm/kasan/report.c:408
 [<ffffffff814fdfc4>] __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:429
 [<ffffffff81239c7e>] __lock_acquire+0x387e/0x4b50 kernel/locking/lockdep.c:3092
 [<ffffffff8123c7be>] lock_acquire+0x15e/0x460 kernel/locking/lockdep.c:3592
 [<ffffffff837754aa>] __raw_spin_lock_bh include/linux/spinlock_api_smp.h:137 [inline]
 [<ffffffff837754aa>] _raw_spin_lock_bh+0x3a/0x50 kernel/locking/spinlock.c:175
 [<ffffffff82df6aa3>] spin_lock_bh include/linux/spinlock.h:307 [inline]
 [<ffffffff82df6aa3>] lock_sock_nested+0x43/0x120 net/core/sock.c:2451
 [<ffffffff834674a0>] lock_sock include/net/sock.h:1493 [inline]
 [<ffffffff834674a0>] pppol2tp_release+0x50/0x310 net/l2tp/l2tp_ppp.c:493
 [<ffffffff82dea37d>] sock_release+0x8d/0x1e0 net/socket.c:586
 [<ffffffff82dea4e6>] sock_close+0x16/0x20 net/socket.c:1037
 [<ffffffff81522f93>] __fput+0x233/0x6d0 fs/file_table.c:208
 [<ffffffff815234b5>] ____fput+0x15/0x20 fs/file_table.c:244
 [<ffffffff8118bb54>] task_work_run+0x104/0x180 kernel/task_work.c:115
 [<ffffffff81132f21>] exit_task_work include/linux/task_work.h:21 [inline]
 [<ffffffff81132f21>] do_exit+0x871/0x2a20 kernel/exit.c:755
 [<ffffffff81139398>] do_group_exit+0x108/0x320 kernel/exit.c:885
 [<ffffffff8115c895>] get_signal+0x565/0x1660 kernel/signal.c:2317
 [<ffffffff8100e7fb>] do_signal+0x8b/0x1d40 arch/x86/kernel/signal.c:712
 [<ffffffff81003602>] exit_to_usermode_loop+0x122/0x170 arch/x86/entry/common.c:247
 [<ffffffff81006545>] prepare_exit_to_usermode arch/x86/entry/common.c:282 [inline]
 [<ffffffff81006545>] syscall_return_slowpath+0x1b5/0x1f0 arch/x86/entry/common.c:347
 [<ffffffff8377635d>] int_ret_from_sys_call+0x25/0xa3

Allocated by task 4349:
 [<ffffffff81035df6>] save_stack_trace+0x26/0x50 arch/x86/kernel/stacktrace.c:63
 [<ffffffff814fc9c3>] save_stack+0x43/0xd0 mm/kasan/kasan.c:512
 [<ffffffff814fcc8d>] set_track mm/kasan/kasan.c:524 [inline]
 [<ffffffff814fcc8d>] kasan_kmalloc+0xad/0xe0 mm/kasan/kasan.c:616
 [<ffffffff814f8f64>] __kmalloc+0x124/0x320 mm/slub.c:3613
 [<ffffffff82df58bc>] kmalloc include/linux/slab.h:481 [inline]
 [<ffffffff82df58bc>] sk_prot_alloc+0x18c/0x310 net/core/sock.c:1354
 [<ffffffff82dfbc0a>] sk_alloc+0x3a/0x3a0 net/core/sock.c:1419
 [<ffffffff83463283>] pppol2tp_create+0x33/0x1f0 net/l2tp/l2tp_ppp.c:551
 [<ffffffff827ffe61>] pppox_create+0xf1/0x200 drivers/net/ppp/pppox.c:121
 [<ffffffff82df07ec>] __sock_create+0x3ac/0x640 net/socket.c:1177
 [<ffffffff82df0cb0>] sock_create net/socket.c:1217 [inline]
 [<ffffffff82df0cb0>] SYSC_socket net/socket.c:1247 [inline]
 [<ffffffff82df0cb0>] SyS_socket+0xf0/0x1b0 net/socket.c:1227
 [<ffffffff837761d9>] entry_SYSCALL_64_fastpath+0x16/0x92

Freed by task 4342:
 [<ffffffff81035df6>] save_stack_trace+0x26/0x50 arch/x86/kernel/stacktrace.c:63
 [<ffffffff814fc9c3>] save_stack+0x43/0xd0 mm/kasan/kasan.c:512
 [<ffffffff814fd2e2>] set_track mm/kasan/kasan.c:524 [inline]
 [<ffffffff814fd2e2>] kasan_slab_free+0x72/0xc0 mm/kasan/kasan.c:589
 [<ffffffff814f9d6c>] slab_free_hook mm/slub.c:1383 [inline]
 [<ffffffff814f9d6c>] slab_free_freelist_hook mm/slub.c:1405 [inline]
 [<ffffffff814f9d6c>] slab_free mm/slub.c:2859 [inline]
 [<ffffffff814f9d6c>] kfree+0xfc/0x300 mm/slub.c:3749
 [<ffffffff82dff7d7>] sk_prot_free net/core/sock.c:1391 [inline]
 [<ffffffff82dff7d7>] sk_destruct+0x3f7/0x4c0 net/core/sock.c:1472
 [<ffffffff82dff8f7>] __sk_free+0x57/0x230 net/core/sock.c:1480
 [<ffffffff82dffb00>] sk_free+0x30/0x40 net/core/sock.c:1491
 [<ffffffff8346688f>] sock_put include/net/sock.h:1639 [inline]
 [<ffffffff8346688f>] pppol2tp_session_sock_put+0x5f/0x70 net/l2tp/l2tp_ppp.c:286
 [<ffffffff8345f284>] l2tp_tunnel_closeall+0x254/0x3b0 net/l2tp/l2tp_core.c:1277
 [<ffffffff8345fe6b>] l2tp_udp_encap_destroy+0x8b/0xf0 net/l2tp/l2tp_core.c:1300
 [<ffffffff8336e6b1>] udpv6_destroy_sock+0xb1/0xd0 net/ipv6/udp.c:1421
 [<ffffffff82e014cb>] sk_common_release+0x6b/0x300 net/core/sock.c:2680
 [<ffffffff8336d665>] udp_lib_close+0x15/0x20 include/net/udp.h:190
 [<ffffffff831d16da>] inet_release+0xfa/0x1d0 net/ipv4/af_inet.c:435
 [<ffffffff832f6f90>] inet6_release+0x50/0x70 net/ipv6/af_inet6.c:424
 [<ffffffff82dea37d>] sock_release+0x8d/0x1e0 net/socket.c:586
 [<ffffffff82dea4e6>] sock_close+0x16/0x20 net/socket.c:1037
 [<ffffffff81522f93>] __fput+0x233/0x6d0 fs/file_table.c:208
 [<ffffffff815234b5>] ____fput+0x15/0x20 fs/file_table.c:244
 [<ffffffff8118bb54>] task_work_run+0x104/0x180 kernel/task_work.c:115
 [<ffffffff81003625>] tracehook_notify_resume include/linux/tracehook.h:191 [inline]
 [<ffffffff81003625>] exit_to_usermode_loop+0x145/0x170 arch/x86/entry/common.c:251
 [<ffffffff81006545>] prepare_exit_to_usermode arch/x86/entry/common.c:282 [inline]
 [<ffffffff81006545>] syscall_return_slowpath+0x1b5/0x1f0 arch/x86/entry/common.c:347
 [<ffffffff8377635d>] int_ret_from_sys_call+0x25/0xa3

The buggy address belongs to the object at ffff8801cc0ac400
 which belongs to the cache kmalloc-2048 of size 2048
The buggy address is located 160 bytes inside of
 2048-byte region [ffff8801cc0ac400, ffff8801cc0acc00)
The buggy address belongs to the page:
------------[ cut here ]------------
WARNING: CPU: 0 PID: 3377 at fs/proc/generic.c:565 remove_proc_entry+0x20e/0x310 fs/proc/generic.c:565()
------------[ cut here ]------------
kernel BUG at include/linux/mm.h:460!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 0 PID: 3377 Comm: kpktgend_0 Not tainted 4.4.112-g3fc4284 #32
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801d082af80 task.stack: ffff8800b3958000
RIP: 0010:[<ffffffff8148feb1>]  [<ffffffff8148feb1>] dump_page mm/debug.c:105 [inline]
RIP: 0010:[<ffffffff8148feb1>]  [<ffffffff8148feb1>] page_mapcount include/linux/mm.h:460 [inline]
RIP: 0010:[<ffffffff8148feb1>]  [<ffffffff8148feb1>] dump_page_badflags+0x191/0x250 mm/debug.c:85
RSP: 0018:ffff8801db207d00  EFLAGS: 00010006
RAX: ffffffff8148feb1 RBX: ffff8801db207d50 RCX: ffffffff8129fe2b
RDX: 0000000000000100 RSI: ffffffff847eaab8 RDI: ffff8801cd2c2f80
RBP: ffff8801db207dd8 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000001 R12: 1ffff1003b640fa6
R13: ffff8801cce57af0 R14: 0000000000000101 R15: ffffffff83843ba0
FS:  0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000041b630 CR3: 00000001d0502000 CR4: 0000000000160670
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffffffff8129fe3b ffffffff8129fd8c ffffffff81d66e00 ffff8801db207d58
 ffff8801cd2c2f80 ffffffff8148feb1 0000000041b58ab3 ffffffff83fa9171
 ffffffff8129fcb0 0000000000000000 ffff8801cce57b80 0000000000000000
Call Trace:
 <IRQ> 
 [<ffffffff812a1de5>] __run_timers kernel/time/timer.c:1250 [inline]
 [<ffffffff812a1de5>] run_timer_softirq+0x4a5/0xbb0 kernel/time/timer.c:1437
 [<ffffffff837796fd>] __do_softirq+0x24d/0xa59 kernel/softirq.c:273
 [<ffffffff8113da79>] invoke_softirq kernel/softirq.c:350 [inline]
 [<ffffffff8113da79>] irq_exit+0x119/0x140 kernel/softirq.c:391
 [<ffffffff83778e3b>] exiting_irq arch/x86/include/asm/apic.h:653 [inline]
 [<ffffffff83778e3b>] smp_apic_timer_interrupt+0x7b/0xa0 arch/x86/kernel/apic/apic.c:926
 [<ffffffff83777d90>] apic_timer_interrupt+0xa0/0xb0 arch/x86/entry/entry_64.S:725
 <EOI> 
 [<ffffffff812695ae>] vprintk_emit+0x55e/0x850 kernel/printk/printk.c:1832
 [<ffffffff812698c8>] vprintk+0x28/0x30 kernel/printk/printk.c:1843
 [<ffffffff812698ed>] vprintk_default+0x1d/0x30 kernel/printk/printk.c:1844
 [<ffffffff8141aa1d>] printk+0xb7/0xe2 kernel/printk/printk.c:1922
 [<ffffffff8112d79e>] warn_slowpath_common+0x8e/0x140 kernel/panic.c:441
 [<ffffffff8112d911>] warn_slowpath_fmt+0xc1/0x110 kernel/panic.c:471
 [<ffffffff8167855e>] remove_proc_entry+0x20e/0x310 fs/proc/generic.c:565
 [<ffffffff82eb8e59>] pktgen_rem_thread net/core/pktgen.c:3342 [inline]
 [<ffffffff82eb8e59>] pktgen_thread_worker+0xbe9/0x6d00 net/core/pktgen.c:3572
 [<ffffffff81190958>] kthread+0x268/0x300 kernel/kthread.c:211
 [<ffffffff837765df>] ret_from_fork+0x3f/0x70 arch/x86/entry/entry_64.S:494
Code: 46 e8 c4 ff ec ff 48 83 c4 08 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 b0 ff ec ff 31 d2 48 c7 c6 20 86 8a 83 48 89 df e8 6f fe ff ff <0f> 0b e8 d8 e0 06 00 e9 21 ff ff ff 89 4d d4 e8 cb e0 06 00 8b 
RIP  [<ffffffff8148feb1>] dump_page mm/debug.c:105 [inline]
RIP  [<ffffffff8148feb1>] page_mapcount include/linux/mm.h:460 [inline]
RIP  [<ffffffff8148feb1>] dump_page_badflags+0x191/0x250 mm/debug.c:85
 RSP <ffff8801db207d00>
---[ end trace 0bdd4771ab9b7163 ]---