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* BUG: stack guard page was hit in arch_stack_walk
@ 2020-08-01 18:09 syzbot
  2020-08-03 21:48 ` Josh Poimboeuf
  0 siblings, 1 reply; 3+ messages in thread
From: syzbot @ 2020-08-01 18:09 UTC (permalink / raw)
  To: bp, hpa, jpoimboe, linux-kernel, mingo, syzkaller-bugs, tglx, viro, x86

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@syzkaller.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@googlegroups.com.

syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.

^ permalink raw reply	[flat|nested] 3+ messages in thread

* Re: BUG: stack guard page was hit in arch_stack_walk
  2020-08-01 18:09 BUG: stack guard page was hit in arch_stack_walk syzbot
@ 2020-08-03 21:48 ` Josh Poimboeuf
  2020-08-03 21:51   ` Josh Poimboeuf
  0 siblings, 1 reply; 3+ messages in thread
From: Josh Poimboeuf @ 2020-08-03 21:48 UTC (permalink / raw)
  To: syzbot, Cong Wang
  Cc: bp, hpa, linux-kernel, mingo, syzkaller-bugs, tglx, viro, x86

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@syzkaller.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@googlegroups.com.
> 
> syzbot will keep track of this issue. See:
> https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
> 

-- 
Josh


^ permalink raw reply	[flat|nested] 3+ messages in thread

* Re: BUG: stack guard page was hit in arch_stack_walk
  2020-08-03 21:48 ` Josh Poimboeuf
@ 2020-08-03 21:51   ` Josh Poimboeuf
  0 siblings, 0 replies; 3+ messages in thread
From: Josh Poimboeuf @ 2020-08-03 21:51 UTC (permalink / raw)
  To: syzbot, Cong Wang
  Cc: bp, hpa, linux-kernel, mingo, syzkaller-bugs, tglx, viro, x86

On Mon, Aug 03, 2020 at 04:48:46PM -0500, Josh Poimboeuf wrote:
> 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

And another:

https://lkml.kernel.org/r/0000000000000897ba05abd4ce25@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@syzkaller.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@googlegroups.com.
> > 
> > syzbot will keep track of this issue. See:
> > https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
> > 
> 
> -- 
> Josh

-- 
Josh


^ permalink raw reply	[flat|nested] 3+ messages in thread

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-- links below jump to the message on this page --
2020-08-01 18:09 BUG: stack guard page was hit in arch_stack_walk syzbot
2020-08-03 21:48 ` Josh Poimboeuf
2020-08-03 21:51   ` Josh Poimboeuf

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