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Date:   Wed, 21 Feb 2018 12:26:51 +0200
From:   Denys Fedoryshchenko <nuclearcat@...learcat.com>
To:     Guillaume Nault <g.nault@...halink.fr>
Cc:     Linux Kernel Network Developers <netdev@...r.kernel.org>
Subject: Re: ppp/pppoe, still panic 4.15.3 in ppp_push

It seems even rebuilding seemingly stable version triggering crashes too 
(but different ones)
Maybe it is coincidence, and bug reproducer appeared in network same 
time i decided to upgrade kernel,
as it happened with xt_MSS(and that bug existed for years).

Deleted quoting, i added more debug options (as much as performance 
degradation allows me).
This is vanilla again:

[14834.090421] 
==================================================================
[14834.091157] BUG: KASAN: use-after-free in __list_add_valid+0x69/0xad
[14834.091521] Read of size 8 at addr ffff8803dbeb8660 by task 
accel-pppd/12636
[14834.091905]
[14834.092282] CPU: 0 PID: 12636 Comm: accel-pppd Not tainted 
4.15.4-build-0134 #1
[14834.092930] Hardware name: HP ProLiant DL320e Gen8 v2, BIOS P80 
04/02/2015
[14834.093320] Call Trace:
[14834.093680]  dump_stack+0xb3/0x13e
[14834.094050]  ? _atomic_dec_and_lock+0x10f/0x10f
[14834.094434]  print_address_description+0x69/0x236
[14834.094814]  ? __list_add_valid+0x69/0xad
[14834.095197]  kasan_report+0x219/0x23f
[14834.095570]  __list_add_valid+0x69/0xad
[14834.095957]  ppp_ioctl+0x1216/0x2201 [ppp_generic]
[14834.096348]  ? ppp_write+0x1cc/0x1cc [ppp_generic]
[14834.096723]  ? get_usage_char.isra.2+0x36/0x36
[14834.097094]  ? packet_poll+0x362/0x362
[14834.097455]  ? lock_downgrade+0x4d0/0x4d0
[14834.097811]  ? rcu_irq_enter_disabled+0x8/0x8
[14834.098187]  ? get_usage_char.isra.2+0x36/0x36
[14834.098561]  ? __fget+0x3b8/0x3eb
[14834.098936]  ? get_usage_char.isra.2+0x36/0x36
[14834.099309]  ? __fget+0x3a0/0x3eb
[14834.099682]  ? get_usage_char.isra.2+0x36/0x36
[14834.100069]  ? __fget+0x3a0/0x3eb
[14834.100443]  ? lock_downgrade+0x4d0/0x4d0
[14834.100814]  ? rcu_irq_enter_disabled+0x8/0x8
[14834.101203]  ? __fget+0x3b8/0x3eb
[14834.101581]  ? expand_files+0x62f/0x62f
[14834.101945]  ? kernel_read+0xed/0xed
[14834.102322]  ? SyS_getpeername+0x28b/0x28b
[14834.102690]  vfs_ioctl+0x6e/0x81
[14834.103049]  do_vfs_ioctl+0xe2f/0xe62
[14834.103413]  ? ioctl_preallocate+0x211/0x211
[14834.103778]  ? __fget_light+0x28c/0x2ca
[14834.104150]  ? iterate_fd+0x2a8/0x2a8
[14834.104526]  ? SyS_rt_sigprocmask+0x12e/0x181
[14834.104876]  ? sigprocmask+0x23f/0x23f
[14834.105231]  ? SyS_write+0x148/0x173
[14834.105580]  ? SyS_read+0x173/0x173
[14834.105943]  SyS_ioctl+0x39/0x55
[14834.106316]  ? do_vfs_ioctl+0xe62/0xe62
[14834.106694]  do_syscall_64+0x262/0x594
[14834.107076]  ? syscall_return_slowpath+0x351/0x351
[14834.107447]  ? up_read+0x17/0x2c
[14834.107806]  ? __do_page_fault+0x68a/0x763
[14834.108171]  ? entry_SYSCALL_64_after_hwframe+0x36/0x9b
[14834.108550]  ? trace_hardirqs_off_thunk+0x1a/0x1c
[14834.108937]  entry_SYSCALL_64_after_hwframe+0x26/0x9b
[14834.109293] RIP: 0033:0x7fc9be3758a7
[14834.109652] RSP: 002b:00007fc9bf92aaf8 EFLAGS: 00000206 ORIG_RAX: 
0000000000000010
[14834.110313] RAX: ffffffffffffffda RBX: 00007fc9bdc5e1e3 RCX: 
00007fc9be3758a7
[14834.110707] RDX: 00007fc9b7ad13e8 RSI: 000000004004743a RDI: 
0000000000004b9f
[14834.111082] RBP: 00007fc9bf92ab20 R08: 0000000000000000 R09: 
000055f07a27fe40
[14834.111471] R10: 0000000000000008 R11: 0000000000000206 R12: 
00007fc9b7ad12d8
[14834.111845] R13: 00007ffd06346a6f R14: 0000000000000000 R15: 
00007fc9bf92b700
[14834.112231]
[14834.112589] Allocated by task 12636:
[14834.112962]  ppp_register_net_channel+0xc4/0x610 [ppp_generic]
[14834.113331]  pppoe_connect+0xe6d/0x1097 [pppoe]
[14834.113691]  SyS_connect+0x19c/0x274
[14834.114054]  do_syscall_64+0x262/0x594
[14834.114421]  entry_SYSCALL_64_after_hwframe+0x26/0x9b
[14834.114792]
[14834.115139] Freed by task 12636:
[14834.115504]  kfree+0xe2/0x154
[14834.115866]  ppp_release+0x11b/0x12a [ppp_generic]
[14834.116240]  __fput+0x342/0x5ba
[14834.116611]  task_work_run+0x15d/0x198
[14834.116973]  exit_to_usermode_loop+0xc7/0x153
[14834.117320]  do_syscall_64+0x53d/0x594
[14834.117694]  entry_SYSCALL_64_after_hwframe+0x26/0x9b
[14834.118067]
[14834.118426] The buggy address belongs to the object at 
ffff8803dbeb8480
[14834.119087] The buggy address is located 480 bytes inside of
[14834.119755] The buggy address belongs to the page:
[14834.120138] page:ffffea000f6fae00 count:1 mapcount:0 mapping:         
  (null) index:0xffff8803dbebd580 compound_mapcount: 0
[14834.120817] flags: 0x17ffe00000008100(slab|head)
[14834.121171] raw: 17ffe00000008100 0000000000000000 ffff8803dbebd580 
00000001001c001b
[14834.121800] raw: ffffea000d718020 ffffea000d32d620 ffff8803f080ee80 
0000000000000000
[14834.122415] page dumped because: kasan: bad access detected
[14834.122787]
[14834.123140] Memory state around the buggy address:
[14834.123503]  ffff8803dbeb8500: fb fb fb fb fb fb fb fb fb fb fb fb fb 
fb fb fb
[14834.124150]  ffff8803dbeb8580: fb fb fb fb fb fb fb fb fb fb fb fb fb 
fb fb fb
[14834.124806] >ffff8803dbeb8600: fb fb fb fb fb fb fb fb fb fb fb fb fb 
fb fb fb
[14834.125467]                                                        ^
[14834.125848]  ffff8803dbeb8680: fb fb fb fb fb fb fb fb fb fb fb fb fb 
fb fb fb
[14834.126493]  ffff8803dbeb8700: fb fb fb fb fb fb fb fb fb fb fb fb fb 
fb fb fb
[14834.127143] 
==================================================================
[14834.127768] Disabling lock debugging due to kernel taint

ferrari-dns 10.0.252.9 # cat udp-2018_02_21.log |grep "Feb 21 06:02:14 
10.0.252.9"
[14834.090421] 
==================================================================
[14834.091157] BUG: KASAN: use-after-free in __list_add_valid+0x69/0xad
[14834.091521] Read of size 8 at addr ffff8803dbeb8660 by task 
accel-pppd/12636
[14834.091905]
[14834.092282] CPU: 0 PID: 12636 Comm: accel-pppd Not tainted 
4.15.4-build-0134 #1
[14834.092930] Hardware name: HP ProLiant DL320e Gen8 v2, BIOS P80 
04/02/2015
[14834.093320] Call Trace:
[14834.093680]  dump_stack+0xb3/0x13e
[14834.094050]  ? _atomic_dec_and_lock+0x10f/0x10f
[14834.094434]  print_address_description+0x69/0x236
[14834.094814]  ? __list_add_valid+0x69/0xad
[14834.095197]  kasan_report+0x219/0x23f
[14834.095570]  __list_add_valid+0x69/0xad
[14834.095957]  ppp_ioctl+0x1216/0x2201 [ppp_generic]
[14834.096348]  ? ppp_write+0x1cc/0x1cc [ppp_generic]
[14834.096723]  ? get_usage_char.isra.2+0x36/0x36
[14834.097094]  ? packet_poll+0x362/0x362
[14834.097455]  ? lock_downgrade+0x4d0/0x4d0
[14834.097811]  ? rcu_irq_enter_disabled+0x8/0x8
[14834.098187]  ? get_usage_char.isra.2+0x36/0x36
[14834.098561]  ? __fget+0x3b8/0x3eb
[14834.098936]  ? get_usage_char.isra.2+0x36/0x36
[14834.099309]  ? __fget+0x3a0/0x3eb
[14834.099682]  ? get_usage_char.isra.2+0x36/0x36
[14834.100069]  ? __fget+0x3a0/0x3eb
[14834.100443]  ? lock_downgrade+0x4d0/0x4d0
[14834.100814]  ? rcu_irq_enter_disabled+0x8/0x8
[14834.101203]  ? __fget+0x3b8/0x3eb
[14834.101581]  ? expand_files+0x62f/0x62f
[14834.101945]  ? kernel_read+0xed/0xed
[14834.102322]  ? SyS_getpeername+0x28b/0x28b
[14834.102690]  vfs_ioctl+0x6e/0x81
[14834.103049]  do_vfs_ioctl+0xe2f/0xe62
[14834.103413]  ? ioctl_preallocate+0x211/0x211
[14834.103778]  ? __fget_light+0x28c/0x2ca
[14834.104150]  ? iterate_fd+0x2a8/0x2a8
[14834.104526]  ? SyS_rt_sigprocmask+0x12e/0x181
[14834.104876]  ? sigprocmask+0x23f/0x23f
[14834.105231]  ? SyS_write+0x148/0x173
[14834.105580]  ? SyS_read+0x173/0x173
[14834.105943]  SyS_ioctl+0x39/0x55
[14834.106316]  ? do_vfs_ioctl+0xe62/0xe62
[14834.106694]  do_syscall_64+0x262/0x594
[14834.107076]  ? syscall_return_slowpath+0x351/0x351
[14834.107447]  ? up_read+0x17/0x2c
[14834.107806]  ? __do_page_fault+0x68a/0x763
[14834.108171]  ? entry_SYSCALL_64_after_hwframe+0x36/0x9b
[14834.108550]  ? trace_hardirqs_off_thunk+0x1a/0x1c
[14834.108937]  entry_SYSCALL_64_after_hwframe+0x26/0x9b
[14834.109293] RIP: 0033:0x7fc9be3758a7
[14834.109652] RSP: 002b:00007fc9bf92aaf8 EFLAGS: 00000206 ORIG_RAX: 
0000000000000010
[14834.110313] RAX: ffffffffffffffda RBX: 00007fc9bdc5e1e3 RCX: 
00007fc9be3758a7
[14834.110707] RDX: 00007fc9b7ad13e8 RSI: 000000004004743a RDI: 
0000000000004b9f
[14834.111082] RBP: 00007fc9bf92ab20 R08: 0000000000000000 R09: 
000055f07a27fe40
[14834.111471] R10: 0000000000000008 R11: 0000000000000206 R12: 
00007fc9b7ad12d8
[14834.111845] R13: 00007ffd06346a6f R14: 0000000000000000 R15: 
00007fc9bf92b700
[14834.112231]
[14834.112589] Allocated by task 12636:
[14834.112962]  ppp_register_net_channel+0xc4/0x610 [ppp_generic]
[14834.113331]  pppoe_connect+0xe6d/0x1097 [pppoe]
[14834.113691]  SyS_connect+0x19c/0x274
[14834.114054]  do_syscall_64+0x262/0x594
[14834.114421]  entry_SYSCALL_64_after_hwframe+0x26/0x9b
[14834.114792]
[14834.115139] Freed by task 12636:
[14834.115504]  kfree+0xe2/0x154
[14834.115866]  ppp_release+0x11b/0x12a [ppp_generic]
[14834.116240]  __fput+0x342/0x5ba
[14834.116611]  task_work_run+0x15d/0x198
[14834.116973]  exit_to_usermode_loop+0xc7/0x153
[14834.117320]  do_syscall_64+0x53d/0x594
[14834.117694]  entry_SYSCALL_64_after_hwframe+0x26/0x9b
[14834.118067]
[14834.118426] The buggy address belongs to the object at 
ffff8803dbeb8480
[14834.119087] The buggy address is located 480 bytes inside of
[14834.119755] The buggy address belongs to the page:
[14834.120138] page:ffffea000f6fae00 count:1 mapcount:0 mapping:         
  (null) index:0xffff8803dbebd580 compound_mapcount: 0
[14834.120817] flags: 0x17ffe00000008100(slab|head)
[14834.121171] raw: 17ffe00000008100 0000000000000000 ffff8803dbebd580 
00000001001c001b
[14834.121800] raw: ffffea000d718020 ffffea000d32d620 ffff8803f080ee80 
0000000000000000
[14834.122415] page dumped because: kasan: bad access detected
[14834.122787]
[14834.123140] Memory state around the buggy address:
[14834.123503]  ffff8803dbeb8500: fb fb fb fb fb fb fb fb fb fb fb fb fb 
fb fb fb
[14834.124150]  ffff8803dbeb8580: fb fb fb fb fb fb fb fb fb fb fb fb fb 
fb fb fb
[14834.124806] >ffff8803dbeb8600: fb fb fb fb fb fb fb fb fb fb fb fb fb 
fb fb fb
[14834.125467]                                                        ^
[14834.125848]  ffff8803dbeb8680: fb fb fb fb fb fb fb fb fb fb fb fb fb 
fb fb fb
[14834.126493]  ffff8803dbeb8700: fb fb fb fb fb fb fb fb fb fb fb fb fb 
fb fb fb
[14834.127143] 
==================================================================
[14834.127768] Disabling lock debugging due to kernel taint

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