linux-kernel - Re: BUG: stack guard page was hit in arch_stack

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Date:   Mon, 3 Aug 2020 16:48:40 -0500
From:   Josh Poimboeuf <jpoimboe@...hat.com>
To:     syzbot <syzbot+c05e6eff86f7a430fa73@...kaller.appspotmail.com>,
        Cong Wang <xiyou.wangcong@...il.com>
Cc:     bp@...en8.de, hpa@...or.com, linux-kernel@...r.kernel.org,
        mingo@...hat.com, syzkaller-bugs@...glegroups.com,
        tglx@...utronix.de, viro@...iv.linux.org.uk, x86@...nel.org
Subject: Re: BUG: stack guard page was hit in arch_stack_walk

Hi Cong,

This looks similar to the stack overflow which was attempted to be fixed
by dd912306ff00 ("net: fix a potential recursive NETDEV_FEAT_CHANGE").

And another syzbot report here:

https://lkml.kernel.org/r/000000000000cb6afe05ab34e77e@google.com

On Sat, Aug 01, 2020 at 11:09:21AM -0700, syzbot wrote:
> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    92ed3019 Linux 5.8-rc7
> git tree:       upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=12c98f28900000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=84f076779e989e69
> dashboard link: https://syzkaller.appspot.com/bug?extid=c05e6eff86f7a430fa73
> compiler:       gcc (GCC) 10.1.0-syz 20200507
> 
> Unfortunately, I don't have any reproducer for this issue yet.
> 
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+c05e6eff86f7a430fa73@...kaller.appspotmail.com
> 
> BUG: stack guard page was hit at 000000009157a0b1 (stack is 000000007cb00dab..0000000055f9d23d)
> kernel stack overflow (double-fault): 0000 [#1] PREEMPT SMP KASAN
> CPU: 0 PID: 13871 Comm: syz-executor.4 Not tainted 5.8.0-rc7-syzkaller #0
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
> RIP: 0010:arch_stack_walk+0x0/0xf0 arch/x86/kernel/stacktrace.c:17
> Code: 8b eb c0 e6 82 89 fa ee ee 8d 57 01 ee ee eb cd e6 81 eb f1 e6 87 eb ed e6 83 eb e9 cc cc cc cc cc cc cc cc cc cc cc cc cc cc <55> 48 89 e5 41 56 49 89 d6 41 55 49 89 cd 41 54 49 89 f4 53 48 89
> RSP: 0018:ffffc90008b18000 EFLAGS: 00010246
> RAX: 0000000000000000 RBX: fffff52001163001 RCX: 0000000000000000
> RDX: ffff88802b30e480 RSI: ffffc90008b18028 RDI: ffffffff8162c090
> RBP: 0000000000000cc0 R08: ffffed1006f83078 R09: ffffed1006f83094
> R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000cc0
> R13: 0000000000000000 R14: ffff88821b77f8c0 R15: 00000000000000e0
> FS:  00007f7369ba8700(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: ffffc90008b17ff8 CR3: 00000000a21ec000 CR4: 00000000001426f0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> Call Trace:
>  stack_trace_save+0x8c/0xc0 kernel/stacktrace.c:123
>  save_stack+0x1b/0x40 mm/kasan/common.c:48
>  set_track mm/kasan/common.c:56 [inline]
>  __kasan_kmalloc.constprop.0+0xc2/0xd0 mm/kasan/common.c:494
>  slab_post_alloc_hook mm/slab.h:586 [inline]
>  slab_alloc_node mm/slab.c:3263 [inline]
>  kmem_cache_alloc_node+0x130/0x3c0 mm/slab.c:3575
>  __alloc_skb+0x71/0x550 net/core/skbuff.c:198
>  alloc_skb include/linux/skbuff.h:1083 [inline]
>  nlmsg_new include/net/netlink.h:940 [inline]
>  rtmsg_ifinfo_build_skb+0x72/0x1a0 net/core/rtnetlink.c:3702
>  rtmsg_ifinfo_event net/core/rtnetlink.c:3738 [inline]
>  rtmsg_ifinfo_event net/core/rtnetlink.c:3729 [inline]
>  rtnetlink_event+0x123/0x1d0 net/core/rtnetlink.c:5512
>  notifier_call_chain+0xb5/0x200 kernel/notifier.c:83
>  call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:2027
>  call_netdevice_notifiers_extack net/core/dev.c:2039 [inline]
>  call_netdevice_notifiers net/core/dev.c:2053 [inline]
>  netdev_features_change net/core/dev.c:1443 [inline]
>  netdev_sync_lower_features net/core/dev.c:9056 [inline]
>  __netdev_update_features+0x88d/0x1360 net/core/dev.c:9187
>  netdev_change_features+0x61/0xb0 net/core/dev.c:9259
>  bond_compute_features+0x502/0xa00 drivers/net/bonding/bond_main.c:1188
>  bond_slave_netdev_event drivers/net/bonding/bond_main.c:3237 [inline]
>  bond_netdev_event+0x81f/0xb30 drivers/net/bonding/bond_main.c:3277
>  notifier_call_chain+0xb5/0x200 kernel/notifier.c:83
>  call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:2027
>  call_netdevice_notifiers_extack net/core/dev.c:2039 [inline]
>  call_netdevice_notifiers net/core/dev.c:2053 [inline]
>  netdev_features_change net/core/dev.c:1443 [inline]
>  netdev_sync_lower_features net/core/dev.c:9056 [inline]
>  __netdev_update_features+0x88d/0x1360 net/core/dev.c:9187
>  netdev_change_features+0x61/0xb0 net/core/dev.c:9259
>  bond_compute_features+0x502/0xa00 drivers/net/bonding/bond_main.c:1188
>  bond_slave_netdev_event drivers/net/bonding/bond_main.c:3237 [inline]
>  bond_netdev_event+0x81f/0xb30 drivers/net/bonding/bond_main.c:3277
>  notifier_call_chain+0xb5/0x200 kernel/notifier.c:83
>  call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:2027
>  call_netdevice_notifiers_extack net/core/dev.c:2039 [inline]
>  call_netdevice_notifiers net/core/dev.c:2053 [inline]
>  netdev_features_change net/core/dev.c:1443 [inline]
>  netdev_sync_lower_features net/core/dev.c:9056 [inline]
>  __netdev_update_features+0x88d/0x1360 net/core/dev.c:9187
>  netdev_change_features+0x61/0xb0 net/core/dev.c:9259
>  bond_compute_features+0x502/0xa00 drivers/net/bonding/bond_main.c:1188
>  bond_slave_netdev_event drivers/net/bonding/bond_main.c:3237 [inline]
>  bond_netdev_event+0x81f/0xb30 drivers/net/bonding/bond_main.c:3277
>  notifier_call_chain+0xb5/0x200 kernel/notifier.c:83
>  call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:2027
>  call_netdevice_notifiers_extack net/core/dev.c:2039 [inline]
>  call_netdevice_notifiers net/core/dev.c:2053 [inline]
>  netdev_features_change net/core/dev.c:1443 [inline]
>  netdev_sync_lower_features net/core/dev.c:9056 [inline]
>  __netdev_update_features+0x88d/0x1360 net/core/dev.c:9187
>  netdev_change_features+0x61/0xb0 net/core/dev.c:9259
>  bond_compute_features+0x502/0xa00 drivers/net/bonding/bond_main.c:1188
>  bond_slave_netdev_event drivers/net/bonding/bond_main.c:3237 [inline]
>  bond_netdev_event+0x81f/0xb30 drivers/net/bonding/bond_main.c:3277
>  notifier_call_chain+0xb5/0x200 kernel/notifier.c:83
>  call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:2027
>  call_netdevice_notifiers_extack net/core/dev.c:2039 [inline]
>  call_netdevice_notifiers net/core/dev.c:2053 [inline]
>  netdev_features_change net/core/dev.c:1443 [inline]
>  netdev_sync_lower_features net/core/dev.c:9056 [inline]
>  __netdev_update_features+0x88d/0x1360 net/core/dev.c:9187
>  netdev_change_features+0x61/0xb0 net/core/dev.c:9259
>  bond_compute_features+0x502/0xa00 drivers/net/bonding/bond_main.c:1188
>  bond_slave_netdev_event drivers/net/bonding/bond_main.c:3237 [inline]
>  bond_netdev_event+0x81f/0xb30 drivers/net/bonding/bond_main.c:3277
>  notifier_call_chain+0xb5/0x200 kernel/notifier.c:83
>  call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:2027
>  call_netdevice_notifiers_extack net/core/dev.c:2039 [inline]
>  call_netdevice_notifiers net/core/dev.c:2053 [inline]
>  netdev_features_change net/core/dev.c:1443 [inline]
>  netdev_sync_lower_features net/core/dev.c:9056 [inline]
>  __netdev_update_features+0x88d/0x1360 net/core/dev.c:9187
>  netdev_change_features+0x61/0xb0 net/core/dev.c:9259
>  bond_compute_features+0x502/0xa00 drivers/net/bonding/bond_main.c:1188
>  bond_slave_netdev_event drivers/net/bonding/bond_main.c:3237 [inline]
>  bond_netdev_event+0x81f/0xb30 drivers/net/bonding/bond_main.c:3277
>  notifier_call_chain+0xb5/0x200 kernel/notifier.c:83
>  call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:2027
>  call_netdevice_notifiers_extack net/core/dev.c:2039 [inline]
>  call_netdevice_notifiers net/core/dev.c:2053 [inline]
>  netdev_features_change net/core/dev.c:1443 [inline]
>  netdev_sync_lower_features net/core/dev.c:9056 [inline]
>  __netdev_update_features+0x88d/0x1360 net/core/dev.c:9187
>  netdev_change_features+0x61/0xb0 net/core/dev.c:9259
>  bond_compute_features+0x502/0xa00 drivers/net/bonding/bond_main.c:1188
>  bond_slave_netdev_event drivers/net/bonding/bond_main.c:3237 [inline]
>  bond_netdev_event+0x81f/0xb30 drivers/net/bonding/bond_main.c:3277
>  notifier_call_chain+0xb5/0x200 kernel/notifier.c:83
>  call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:2027
>  call_netdevice_notifiers_extack net/core/dev.c:2039 [inline]
>  call_netdevice_notifiers net/core/dev.c:2053 [inline]
>  netdev_features_change net/core/dev.c:1443 [inline]
>  netdev_sync_lower_features net/core/dev.c:9056 [inline]
>  __netdev_update_features+0x88d/0x1360 net/core/dev.c:9187
>  netdev_change_features+0x61/0xb0 net/core/dev.c:9259
>  bond_compute_features+0x502/0xa00 drivers/net/bonding/bond_main.c:1188
> Lost 536 message(s)!
> ---[ end trace 00f7ed0d29de9cad ]---
> RIP: 0010:arch_stack_walk+0x0/0xf0 arch/x86/kernel/stacktrace.c:17
> Code: 8b eb c0 e6 82 89 fa ee ee 8d 57 01 ee ee eb cd e6 81 eb f1 e6 87 eb ed e6 83 eb e9 cc cc cc cc cc cc cc cc cc cc cc cc cc cc <55> 48 89 e5 41 56 49 89 d6 41 55 49 89 cd 41 54 49 89 f4 53 48 89
> RSP: 0018:ffffc90008b18000 EFLAGS: 00010246
> RAX: 0000000000000000 RBX: fffff52001163001 RCX: 0000000000000000
> RDX: ffff88802b30e480 RSI: ffffc90008b18028 RDI: ffffffff8162c090
> RBP: 0000000000000cc0 R08: ffffed1006f83078 R09: ffffed1006f83094
> R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000cc0
> R13: 0000000000000000 R14: ffff88821b77f8c0 R15: 00000000000000e0
> FS:  00007f7369ba8700(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: ffffc90008b17ff8 CR3: 00000000a21ec000 CR4: 00000000001426f0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> 
> 
> ---
> This report is generated by a bot. It may contain errors.
> See https://goo.gl/tpsmEJ for more information about syzbot.
> syzbot engineers can be reached at syzkaller@...glegroups.com.
> 
> syzbot will keep track of this issue. See:
> https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
> 

-- 
Josh