general protection fault in prepare_to_wait

[syzbot]

Hello,

syzbot found the following crash on:

HEAD commit: e888402789b9 net: hns3: call hns3_nic_net_open() while doi..
git tree: net
console output: https://syzkaller.appspot.com/x/log.txt?x=11876fb3400000
kernel config: https://syzkaller.appspot.com/x/.config?x=b6c41ffa3d657353
dashboard link: https://syzkaller.appspot.com/bug?extid=55f9d3e51d49e20b2ce5
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+55f9d3...@syzkaller.appspotmail.com

kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 22808 Comm: syz-executor4 Not tainted 4.20.0+ #4
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
RIP: 0010:__lock_acquire+0x904/0x4a30 kernel/locking/lockdep.c:3215
Code: 28 00 00 00 0f 85 32 29 00 00 48 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f
5d c3 48 b8 00 00 00 00 00 fc ff df 4c 89 da 48 c1 ea 03 <80> 3c 02 00 0f
85 2d 2c 00 00 49 81 3b e0 a3 9a 8a 0f 84 09 f8 ff
RSP: 0018:ffff8880903ff6a0 EFLAGS: 00010006
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000003 RSI: 0000000000000000 RDI: 0000000000000018
RBP: ffff8880903ff928 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000001 R11: 0000000000000018 R12: ffff8880a0410200
R13: 0000000000000001 R14: 0000000000000001 R15: 0000000000000000
FS: 00007f56c8420700(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f7c92bf84a0 CR3: 00000000931da000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
kobject: 'loop1' (00000000563158a3): kobject_uevent_env
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
kobject: 'loop1' (00000000563158a3): fill_kobj_path: path
= '/devices/virtual/block/loop1'
Call Trace:
kobject: 'loop2' (000000007e06da14): kobject_uevent_env
kobject: 'loop2' (000000007e06da14): fill_kobj_path: path
= '/devices/virtual/block/loop2'
lock_acquire+0x1db/0x570 kernel/locking/lockdep.c:3841
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x95/0xcd kernel/locking/spinlock.c:152
prepare_to_wait+0xa7/0x420 kernel/sched/wait.c:230
nr_accept+0x31f/0xa20 net/netrom/af_netrom.c:796
kobject: 'loop1' (00000000563158a3): kobject_uevent_env
__sys_accept4+0x3a9/0x840 net/socket.c:1590
kobject: 'loop1' (00000000563158a3): fill_kobj_path: path
= '/devices/virtual/block/loop1'
__do_sys_accept net/socket.c:1631 [inline]
__se_sys_accept net/socket.c:1628 [inline]
__x64_sys_accept+0x75/0xb0 net/socket.c:1628
do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x457ec9
Code: 6d b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7
48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff
ff 0f 83 3b b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f56c841fc78 EFLAGS: 00000246 ORIG_RAX: 000000000000002b
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457ec9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005
RBP: 000000000073c0e0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f56c84206d4
R13: 00000000004bdcb6 R14: 00000000004cdac0 R15: 00000000ffffffff
Modules linked in:
---[ end trace 950cf3f0884cbe4a ]---
RIP: 0010:__lock_acquire+0x904/0x4a30 kernel/locking/lockdep.c:3215
Code: 28 00 00 00 0f 85 32 29 00 00 48 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f
5d c3 48 b8 00 00 00 00 00 fc ff df 4c 89 da 48 c1 ea 03 <80> 3c 02 00 0f
85 2d 2c 00 00 49 81 3b e0 a3 9a 8a 0f 84 09 f8 ff
RSP: 0018:ffff8880903ff6a0 EFLAGS: 00010006
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000003 RSI: 0000000000000000 RDI: 0000000000000018
RBP: ffff8880903ff928 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000001 R11: 0000000000000018 R12: ffff8880a0410200
R13: 0000000000000001 R14: 0000000000000001 R15: 0000000000000000
FS: 00007f56c8420700(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f7c92bf84a0 CR3: 00000000931da000 CR4: 00000000001406f0
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 syzk...@googlegroups.com.

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

[syzbot]

syzbot has found a reproducer for the following crash on:

HEAD commit: ec7fd009e87c Merge branch 'ipv6-fixes'
git tree: net
console output: https://syzkaller.appspot.com/x/log.txt?x=17fc3d97400000
kernel config: https://syzkaller.appspot.com/x/.config?x=2e0064f906afee10

dashboard link: https://syzkaller.appspot.com/bug?extid=55f9d3e51d49e20b2ce5
compiler: gcc (GCC) 9.0.0 20181231 (experimental)

syz repro: https://syzkaller.appspot.com/x/repro.syz?x=16970150c00000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+55f9d3...@syzkaller.appspotmail.com

8021q: adding VLAN 0 to HW filter on device batadv0
8021q: adding VLAN 0 to HW filter on device batadv0
8021q: adding VLAN 0 to HW filter on device batadv0

kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN

CPU: 0 PID: 7733 Comm: syz-executor3 Not tainted 5.0.0-rc4+ #67

Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011

RIP: 0010:__lock_acquire+0x8df/0x4700 kernel/locking/lockdep.c:3215
Code: 28 00 00 00 0f 85 35 27 00 00 48 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f
5d c3 48 b8 00 00 00 00 00 fc ff df 4c 89 e2 48 c1 ea 03 <80> 3c 02 00 0f
85 dc 27 00 00 49 81 3c 24 20 25 9a 89 0f 84 03 f8
RSP: 0018:ffff888088fa7970 EFLAGS: 00010006

RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000003 RSI: 0000000000000000 RDI: 0000000000000018

RBP: ffff888088fa7b40 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000018
R13: 0000000000000001 R14: 0000000000000000 R15: ffff888098fc60c0
FS: 00007f2176cc4700(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000

CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033

CR2: 00007f763933ddb8 CR3: 0000000088560000 CR4: 00000000001406f0
Call Trace:
lock_acquire+0x16f/0x3f0 kernel/locking/lockdep.c:3841

__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x95/0xcd kernel/locking/spinlock.c:152

prepare_to_wait+0x7c/0x300 kernel/sched/wait.c:230
nr_accept+0x239/0x790 net/netrom/af_netrom.c:796
__sys_accept4+0x350/0x6a0 net/socket.c:1588
__do_sys_accept net/socket.c:1629 [inline]
__se_sys_accept net/socket.c:1626 [inline]
__x64_sys_accept+0x75/0xb0 net/socket.c:1626
do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x457e39
Code: ad b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7

48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff

ff 0f 83 7b b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f2176cc3c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002b
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457e39
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004

RBP: 000000000073c0e0 R08: 0000000000000000 R09: 0000000000000000

R10: 0000000000000000 R11: 0000000000000246 R12: 00007f2176cc46d4
R13: 00000000004bdc10 R14: 00000000004cdea0 R15: 00000000ffffffff
Modules linked in:
---[ end trace 82c8ff081ad12861 ]---
RIP: 0010:__lock_acquire+0x8df/0x4700 kernel/locking/lockdep.c:3215
Code: 28 00 00 00 0f 85 35 27 00 00 48 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f
5d c3 48 b8 00 00 00 00 00 fc ff df 4c 89 e2 48 c1 ea 03 <80> 3c 02 00 0f
85 dc 27 00 00 49 81 3c 24 20 25 9a 89 0f 84 03 f8
RSP: 0018:ffff888088fa7970 EFLAGS: 00010006

RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000003 RSI: 0000000000000000 RDI: 0000000000000018

RBP: ffff888088fa7b40 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000018
R13: 0000000000000001 R14: 0000000000000000 R15: ffff888098fc60c0
FS: 00007f2176cc4700(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000

CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033

CR2: 00007f763933ddb8 CR3: 0000000088560000 CR4: 00000000001406f0

[syzbot]

Hello,

syzbot has tested the proposed patch but the reproducer still triggered
crash:
general protection fault in prepare_to_wait

8021q: adding VLAN 0 to HW filter on device batadv0

IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready

8021q: adding VLAN 0 to HW filter on device batadv0
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN

CPU: 1 PID: 7732 Comm: syz-executor2 Not tainted 5.0.0-rc5+ #1

Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
RIP: 0010:__lock_acquire+0x8df/0x4700 kernel/locking/lockdep.c:3215
Code: 28 00 00 00 0f 85 35 27 00 00 48 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f
5d c3 48 b8 00 00 00 00 00 fc ff df 4c 89 e2 48 c1 ea 03 <80> 3c 02 00 0f
85 dc 27 00 00 49 81 3c 24 20 25 9a 89 0f 84 03 f8

RSP: 0018:ffff888093897970 EFLAGS: 00010006

RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000003 RSI: 0000000000000000 RDI: 0000000000000018

RBP: ffff888093897b40 R08: 0000000000000001 R09: 0000000000000001

R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000018

R13: 0000000000000001 R14: 0000000000000000 R15: ffff8880a7c7a080
FS: 00007f753f694700(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000

CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033

CR2: 00007f753f60fdb8 CR3: 000000008b867000 CR4: 00000000001406e0

Call Trace:
lock_acquire+0x16f/0x3f0 kernel/locking/lockdep.c:3841
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x95/0xcd kernel/locking/spinlock.c:152
prepare_to_wait+0x7c/0x300 kernel/sched/wait.c:230
nr_accept+0x239/0x790 net/netrom/af_netrom.c:796
__sys_accept4+0x350/0x6a0 net/socket.c:1588
__do_sys_accept net/socket.c:1629 [inline]
__se_sys_accept net/socket.c:1626 [inline]
__x64_sys_accept+0x75/0xb0 net/socket.c:1626
do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x457e39
Code: ad b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7
48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff
ff 0f 83 7b b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00

RSP: 002b:00007f753f693c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002b

RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457e39
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004

RBP: 000000000073bfa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f753f6946d4

R13: 00000000004bdc10 R14: 00000000004cdea0 R15: 00000000ffffffff
Modules linked in:

---[ end trace 2d5dfdb5ebb16d6b ]---

RIP: 0010:__lock_acquire+0x8df/0x4700 kernel/locking/lockdep.c:3215
Code: 28 00 00 00 0f 85 35 27 00 00 48 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f
5d c3 48 b8 00 00 00 00 00 fc ff df 4c 89 e2 48 c1 ea 03 <80> 3c 02 00 0f
85 dc 27 00 00 49 81 3c 24 20 25 9a 89 0f 84 03 f8

RSP: 0018:ffff888093897970 EFLAGS: 00010006

RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000003 RSI: 0000000000000000 RDI: 0000000000000018

RBP: ffff888093897b40 R08: 0000000000000001 R09: 0000000000000001

R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000018

R13: 0000000000000001 R14: 0000000000000000 R15: ffff8880a7c7a080
FS: 00007f753f694700(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000

CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033

CR2: 00007f753f60fdb8 CR3: 000000008b867000 CR4: 00000000001406e0


Tested on:

commit: 1b03d6ee0967 nr: move sock_orphan() inside lock sock prote..
git tree: https://github.com/congwang/linux.git netrom
console output: https://syzkaller.appspot.com/x/log.txt?x=12662988c00000
kernel config: https://syzkaller.appspot.com/x/.config?x=8f00801d7b7c4fe6

[syzbot]

Hello,

syzbot has tested the proposed patch and the reproducer did not trigger
crash:

Reported-and-tested-by:
syzbot+55f9d3...@syzkaller.appspotmail.com

Tested on:

commit: 330e611b4575 nr: move sock_orphan() inside lock sock prote..

git tree: https://github.com/congwang/linux.git netrom

kernel config: https://syzkaller.appspot.com/x/.config?x=8f00801d7b7c4fe6
compiler: gcc (GCC) 9.0.0 20181231 (experimental)

Note: testing is done by a robot and is best-effort only.

[syzbot]

Hello,

syzbot has tested the proposed patch but the reproducer still triggered
crash:

general protection fault in nr_accept

IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready

8021q: adding VLAN 0 to HW filter on device batadv0
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access

sk = ffff8880941236c0 flags = 0, newsk = ffff8880a86244c0 flags = 0

general protection fault: 0000 [#1] PREEMPT SMP KASAN

CPU: 0 PID: 7842 Comm: syz-executor4 Not tainted 5.0.0-rc5+ #1

Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011

RIP: 0010:nr_accept+0x372/0x7c0 net/netrom/af_netrom.c:815
Code: ea 03 80 3c 02 00 0f 85 21 04 00 00 49 8b bc 24 08 02 00 00 48 8b b5
18 ff ff ff e8 48 0d 21 fb 48 b8 03 00 00 00 00 fc ff df <80> 38 00 0f 85
eb 03 00 00 4c 8b 2c 25 18 00 00 00 b8 ff ff 37 00
RSP: 0018:ffff88808cd2fc88 EFLAGS: 00010286
RAX: dffffc0000000003 RBX: 1ffff110119a5f97 RCX: 0000000000000000
RDX: 0000000000000004 RSI: ffff88808e7128c0 RDI: 0000000000000001
sk = ffff888093fe1200 flags = 0, newsk = ffff8880904e61c0 flags = 0
RBP: ffff88808cd2fd80 R08: ffff88808e712040 R09: ffff88808e7128e0
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880916fe380
R13: ffff888097222580 R14: 0000000000000004 R15: 00000000fffffe00
FS: 00007f45c6af8700(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000

CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033

CR2: 00007f18b86c82b8 CR3: 00000000a8c86000 CR4: 00000000001406f0

DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

Call Trace:

__sys_accept4+0x350/0x6a0 net/socket.c:1588
__do_sys_accept net/socket.c:1629 [inline]
__se_sys_accept net/socket.c:1626 [inline]
__x64_sys_accept+0x75/0xb0 net/socket.c:1626
do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x457e39
Code: ad b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7
48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff
ff 0f 83 7b b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00

RSP: 002b:00007f45c6af7c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002b

RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457e39

RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000007
RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f45c6af86d4

R13: 00000000004bdc10 R14: 00000000004cdea0 R15: 00000000ffffffff
Modules linked in:

------------[ cut here ]------------
downgrading a read lock
WARNING: CPU: 0 PID: 7870 at kernel/locking/lockdep.c:3553 __lock_downgrade
kernel/locking/lockdep.c:3553 [inline]
WARNING: CPU: 0 PID: 7870 at kernel/locking/lockdep.c:3553
lock_downgrade+0x478/0x810 kernel/locking/lockdep.c:3816


Tested on:

commit: 0bc876f98cdf netrom: debug

git tree: https://github.com/congwang/linux.git netrom

console output: https://syzkaller.appspot.com/x/log.txt?x=168d851f400000

[syzbot]

Hello,

syzbot has tested the proposed patch and the reproducer did not trigger
crash:

Reported-and-tested-by:
syzbot+55f9d3...@syzkaller.appspotmail.com

Tested on:

commit: 4c4a9b3e01d5 nr: debug

git tree: https://github.com/congwang/linux.git netrom

kernel config: https://syzkaller.appspot.com/x/.config?x=8f00801d7b7c4fe6
compiler: gcc (GCC) 9.0.0 20181231 (experimental)

[syzbot]

Hello,

syzbot has tested the proposed patch and the reproducer did not trigger
crash:

Reported-and-tested-by:
syzbot+55f9d3...@syzkaller.appspotmail.com

Tested on:

commit: 318cd6e2d443 nr: debug

[syzbot]

syzbot has found a reproducer for the following crash on:

HEAD commit: 23e93c9b2cde Revert "gfs2: read journal in large chunks to..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=14e94014c00000
kernel config: https://syzkaller.appspot.com/x/.config?x=ee434566c893c7b1

dashboard link: https://syzkaller.appspot.com/bug?extid=55f9d3e51d49e20b2ce5
compiler: gcc (GCC) 9.0.0 20181231 (experimental)

syz repro: https://syzkaller.appspot.com/x/repro.syz?x=109c886cc00000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=11ed20d0c00000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+55f9d3...@syzkaller.appspotmail.com

IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_hsr: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready
kasan: CONFIG_KASAN_INLINE enabled

8021q: adding VLAN 0 to HW filter on device batadv0

kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN

CPU: 0 PID: 7785 Comm: syz-executor295 Not tainted 5.0.0-rc6+ #72

Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011

RIP: 0010:__lock_acquire+0x8df/0x4700 kernel/locking/lockdep.c:3215
Code: 28 00 00 00 0f 85 35 27 00 00 48 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f
5d c3 48 b8 00 00 00 00 00 fc ff df 4c 89 e2 48 c1 ea 03 <80> 3c 02 00 0f
85 dc 27 00 00 49 81 3c 24 20 25 9a 89 0f 84 03 f8

RSP: 0018:ffff888094c6f970 EFLAGS: 00010006
kobject: 'vlan0' (00000000d30c60ff): kobject_add_internal: parent: 'mesh',
set: '<NULL>'

RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000003 RSI: 0000000000000000 RDI: 0000000000000018

RBP: ffff888094c6fb40 R08: 0000000000000001 R09: 0000000000000001

R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000018

R13: 0000000000000001 R14: 0000000000000000 R15: ffff88808c0f00c0
FS: 00007f9abeeec700(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000

8021q: adding VLAN 0 to HW filter on device batadv0

CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033

kobject: 'vlan0' (00000000a54e32cc): kobject_add_internal: parent: 'mesh',
set: '<NULL>'
CR2: 00000000004d0910 CR3: 00000000906d2000 CR4: 00000000001406f0

DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

8021q: adding VLAN 0 to HW filter on device batadv0

Call Trace:
kobject: 'vlan0' (0000000016be0e34): kobject_add_internal: parent: 'mesh',
set: '<NULL>'
lock_acquire+0x16f/0x3f0 kernel/locking/lockdep.c:3841

__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x95/0xcd kernel/locking/spinlock.c:152

prepare_to_wait+0x7c/0x300 kernel/sched/wait.c:230
nr_accept+0x239/0x790 net/netrom/af_netrom.c:796

__sys_accept4+0x350/0x6a0 net/socket.c:1588
__do_sys_accept net/socket.c:1629 [inline]
__se_sys_accept net/socket.c:1626 [inline]
__x64_sys_accept+0x75/0xb0 net/socket.c:1626

do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x449489
Code: e8 7c e6 ff ff 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7

48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff

ff 0f 83 1b 05 fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f9abeeebcc8 EFLAGS: 00000246 ORIG_RAX: 000000000000002b
RAX: ffffffffffffffda RBX: 00000000006dfc68 RCX: 0000000000449489
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004
RBP: 00000000006dfc60 R08: 00007f9abeeec700 R09: 0000000000000000
R10: 00007f9abeeec700 R11: 0000000000000246 R12: 00000000006dfc6c
R13: 00007ffe8979730f R14: 00007f9abeeec9c0 R15: 0000000000000002
Modules linked in:
---[ end trace 91ccd60fc619e2e6 ]---

RIP: 0010:__lock_acquire+0x8df/0x4700 kernel/locking/lockdep.c:3215
Code: 28 00 00 00 0f 85 35 27 00 00 48 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f
5d c3 48 b8 00 00 00 00 00 fc ff df 4c 89 e2 48 c1 ea 03 <80> 3c 02 00 0f
85 dc 27 00 00 49 81 3c 24 20 25 9a 89 0f 84 03 f8

RSP: 0018:ffff888094c6f970 EFLAGS: 00010006

RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000003 RSI: 0000000000000000 RDI: 0000000000000018

RBP: ffff888094c6fb40 R08: 0000000000000001 R09: 0000000000000001

R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000018

R13: 0000000000000001 R14: 0000000000000000 R15: ffff88808c0f00c0
FS: 00007f9abeeec700(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000

CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033

CR2: 00000000004d0910 CR3: 00000000906d2000 CR4: 00000000001406f0

[syzbot]

Bisection is inconclusive: the bug happens on the oldest tested release.

bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=14fb90ef200000
start commit: [unknown
git tree: upstream
final crash: https://syzkaller.appspot.com/x/report.txt?x=16fb90ef200000
console output: https://syzkaller.appspot.com/x/log.txt?x=12fb90ef200000
dashboard link: https://syzkaller.appspot.com/bug?extid=55f9d3e51d49e20b2ce5

syz repro: https://syzkaller.appspot.com/x/repro.syz?x=109c886cc00000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=11ed20d0c00000

For information about bisection process see: https://goo.gl/tpsmEJ#bisection

[syzbot]

Auto-closing this bug as obsolete.
No recent activity, existing reproducers are no longer triggering the issue.