* general protection fault in nfsd_reply_cache_free_locked
@ 2020-05-12 6:55 syzbot
2020-06-03 1:14 ` J. Bruce Fields
0 siblings, 1 reply; 2+ messages in thread
From: syzbot @ 2020-05-12 6:55 UTC (permalink / raw)
To: bfields, chuck.lever, linux-kernel, linux-nfs, syzkaller-bugs
Hello,
syzbot found the following crash on:
HEAD commit: 6e7f2eac Merge tag 'arm64-fixes' of git://git.kernel.org/p..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=14567034100000
kernel config: https://syzkaller.appspot.com/x/.config?x=b0212dbee046bc1f
dashboard link: https://syzkaller.appspot.com/bug?extid=a29df412692980277f9d
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
Unfortunately, I don't have any reproducer for this crash yet.
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+a29df412692980277f9d@syzkaller.appspotmail.com
general protection fault, probably for non-canonical address 0xdffffc0000000002: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017]
CPU: 0 PID: 27932 Comm: kworker/u4:4 Not tainted 5.7.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: netns cleanup_net
RIP: 0010:nfsd_reply_cache_free_locked+0x2d/0x380 fs/nfsd/nfscache.c:122
Code: 56 41 55 41 54 49 89 fc 55 48 89 f5 53 48 89 d3 e8 08 c0 2f ff 48 8d 7d 61 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 04 02 48 89 fa 83 e2 07 38 d0 7f 08 84 c0 0f 85 a7 02 00 00
RSP: 0018:ffffc90008bb7b70 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: ffff888000026000 RCX: dffffc0000000000
RDX: 0000000000000002 RSI: ffffffff82436ea8 RDI: 0000000000000011
RBP: ffffffffffffffb0 R08: ffff888093792400 R09: fffffbfff185cf3e
R10: ffffffff8c2e79ef R11: fffffbfff185cf3d R12: ffff888000100000
R13: ffff888000100008 R14: 0000000000000000 R15: ffff888000100000
FS: 0000000000000000(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2c531000 CR3: 00000000685a2000 CR4: 00000000001426f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
nfsd_reply_cache_shutdown+0x150/0x350 fs/nfsd/nfscache.c:203
nfsd_exit_net+0x189/0x4c0 fs/nfsd/nfsctl.c:1504
ops_exit_list.isra.0+0xa8/0x150 net/core/net_namespace.c:186
cleanup_net+0x511/0xa50 net/core/net_namespace.c:603
process_one_work+0x965/0x16a0 kernel/workqueue.c:2268
worker_thread+0x96/0xe20 kernel/workqueue.c:2414
kthread+0x388/0x470 kernel/kthread.c:268
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
Modules linked in:
---[ end trace 54f06072fc6a1afa ]---
RIP: 0010:nfsd_reply_cache_free_locked+0x2d/0x380 fs/nfsd/nfscache.c:122
Code: 56 41 55 41 54 49 89 fc 55 48 89 f5 53 48 89 d3 e8 08 c0 2f ff 48 8d 7d 61 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 04 02 48 89 fa 83 e2 07 38 d0 7f 08 84 c0 0f 85 a7 02 00 00
RSP: 0018:ffffc90008bb7b70 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: ffff888000026000 RCX: dffffc0000000000
RDX: 0000000000000002 RSI: ffffffff82436ea8 RDI: 0000000000000011
RBP: ffffffffffffffb0 R08: ffff888093792400 R09: fffffbfff185cf3e
R10: ffffffff8c2e79ef R11: fffffbfff185cf3d R12: ffff888000100000
R13: ffff888000100008 R14: 0000000000000000 R15: ffff888000100000
FS: 0000000000000000(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2c531000 CR3: 0000000094cfb000 CR4: 00000000001426f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
---
This bug 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 bug report. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: general protection fault in nfsd_reply_cache_free_locked
2020-05-12 6:55 general protection fault in nfsd_reply_cache_free_locked syzbot
@ 2020-06-03 1:14 ` J. Bruce Fields
0 siblings, 0 replies; 2+ messages in thread
From: J. Bruce Fields @ 2020-06-03 1:14 UTC (permalink / raw)
To: syzbot; +Cc: chuck.lever, linux-kernel, linux-nfs, syzkaller-bugs
On Mon, May 11, 2020 at 11:55:16PM -0700, syzbot wrote:
> Hello,
>
> syzbot found the following crash on:
This is like
https://lore.kernel.org/linux-nfs/0000000000005016dd05a5e6b308@google.com/
in that we're discovering the drc is corrupt while destroying it.
I don't see the problem yet.
--b.
>
> HEAD commit: 6e7f2eac Merge tag 'arm64-fixes' of git://git.kernel.org/p..
> git tree: upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=14567034100000
> kernel config: https://syzkaller.appspot.com/x/.config?x=b0212dbee046bc1f
> dashboard link: https://syzkaller.appspot.com/bug?extid=a29df412692980277f9d
> compiler: gcc (GCC) 9.0.0 20181231 (experimental)
>
> Unfortunately, I don't have any reproducer for this crash yet.
>
> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> Reported-by: syzbot+a29df412692980277f9d@syzkaller.appspotmail.com
>
> general protection fault, probably for non-canonical address 0xdffffc0000000002: 0000 [#1] PREEMPT SMP KASAN
> KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017]
> CPU: 0 PID: 27932 Comm: kworker/u4:4 Not tainted 5.7.0-rc4-syzkaller #0
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
> Workqueue: netns cleanup_net
> RIP: 0010:nfsd_reply_cache_free_locked+0x2d/0x380 fs/nfsd/nfscache.c:122
> Code: 56 41 55 41 54 49 89 fc 55 48 89 f5 53 48 89 d3 e8 08 c0 2f ff 48 8d 7d 61 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 04 02 48 89 fa 83 e2 07 38 d0 7f 08 84 c0 0f 85 a7 02 00 00
> RSP: 0018:ffffc90008bb7b70 EFLAGS: 00010202
> RAX: dffffc0000000000 RBX: ffff888000026000 RCX: dffffc0000000000
> RDX: 0000000000000002 RSI: ffffffff82436ea8 RDI: 0000000000000011
> RBP: ffffffffffffffb0 R08: ffff888093792400 R09: fffffbfff185cf3e
> R10: ffffffff8c2e79ef R11: fffffbfff185cf3d R12: ffff888000100000
> R13: ffff888000100008 R14: 0000000000000000 R15: ffff888000100000
> FS: 0000000000000000(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 0000001b2c531000 CR3: 00000000685a2000 CR4: 00000000001426f0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> Call Trace:
> nfsd_reply_cache_shutdown+0x150/0x350 fs/nfsd/nfscache.c:203
> nfsd_exit_net+0x189/0x4c0 fs/nfsd/nfsctl.c:1504
> ops_exit_list.isra.0+0xa8/0x150 net/core/net_namespace.c:186
> cleanup_net+0x511/0xa50 net/core/net_namespace.c:603
> process_one_work+0x965/0x16a0 kernel/workqueue.c:2268
> worker_thread+0x96/0xe20 kernel/workqueue.c:2414
> kthread+0x388/0x470 kernel/kthread.c:268
> ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
> Modules linked in:
> ---[ end trace 54f06072fc6a1afa ]---
> RIP: 0010:nfsd_reply_cache_free_locked+0x2d/0x380 fs/nfsd/nfscache.c:122
> Code: 56 41 55 41 54 49 89 fc 55 48 89 f5 53 48 89 d3 e8 08 c0 2f ff 48 8d 7d 61 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 04 02 48 89 fa 83 e2 07 38 d0 7f 08 84 c0 0f 85 a7 02 00 00
> RSP: 0018:ffffc90008bb7b70 EFLAGS: 00010202
> RAX: dffffc0000000000 RBX: ffff888000026000 RCX: dffffc0000000000
> RDX: 0000000000000002 RSI: ffffffff82436ea8 RDI: 0000000000000011
> RBP: ffffffffffffffb0 R08: ffff888093792400 R09: fffffbfff185cf3e
> R10: ffffffff8c2e79ef R11: fffffbfff185cf3d R12: ffff888000100000
> R13: ffff888000100008 R14: 0000000000000000 R15: ffff888000100000
> FS: 0000000000000000(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 0000001b2c531000 CR3: 0000000094cfb000 CR4: 00000000001426f0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
>
>
> ---
> This bug 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 bug report. See:
> https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
^ permalink raw reply [flat|nested] 2+ messages in thread
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2020-06-03 1:14 ` J. Bruce Fields
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