* [moderation/CI] Re: macvlan: allow source mode devices along with passthru
@ 2026-07-10 9:28 syzbot ci
2026-07-10 9:54 ` Pimyn Girgis
0 siblings, 1 reply; 4+ messages in thread
From: syzbot ci @ 2026-07-10 9:28 UTC (permalink / raw)
To: syzkaller-upstream-moderation; +Cc: syzbot
syzbot ci has tested the following series
[v2] macvlan: allow source mode devices along with passthru
https://lore.kernel.org/all/20260709100512.1383421-1-t.martitz@fritz.com
* [PATCH v2 1/1] macvlan: allow source mode devices along with passthru
and found the following issue:
general protection fault in macvlan_port_release_mac
Full report is available here:
https://ci.syzbot.org/series/2632619d-fb66-47ac-85a1-a781bbb0d57d
***
general protection fault in macvlan_port_release_mac
tree: net-next
URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/netdev/net-next.git
base: fe3e786ef4eb6e47d2901f568a27bd920477bbe9
arch: amd64
compiler: Debian clang version 22.1.6 (++20260514074242+fc4aad7b5db3-1~exp1~20260514074407.73), Debian LLD 22.1.6
config: https://ci.syzbot.org/builds/90f86060-ab12-43d6-a718-5d0f5eb5df09/config
syz repro: https://ci.syzbot.org/findings/d1f12788-51d7-4251-8fc9-6bfda6a1e20a/syz_repro
batman_adv: batadv0: Removing interface: batadv_slave_1
veth1_macvtap: left promiscuous mode
veth0_macvtap: left promiscuous mode
veth1_vlan: left promiscuous mode
veth0_vlan: left promiscuous mode
Oops: general protection fault, probably for non-canonical address 0xdffffc0000000118: 0000 [#1] SMP KASAN PTI
KASAN: null-ptr-deref in range [0x00000000000008c0-0x00000000000008c7]
CPU: 0 UID: 0 PID: 12 Comm: kworker/u8:0 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Workqueue: netns cleanup_net
RIP: 0010:macvlan_passthru drivers/net/macvlan.c:78 [inline]
RIP: 0010:macvlan_port_release_mac+0x138/0x490 drivers/net/macvlan.c:807
Code: 01 00 00 48 89 d8 48 c1 e8 03 42 80 3c 20 00 74 08 48 89 df e8 b9 30 ae fb 48 8b 1b 4c 8d b3 c0 08 00 00 4c 89 f0 48 c1 e8 03 <42> 0f b6 04 20 84 c0 0f 85 44 02 00 00 45 8b 36 44 89 f6 83 e6 01
RSP: 0018:ffffc90000117500 EFLAGS: 00010206
RAX: 0000000000000118 RBX: 0000000000000000 RCX: ffff888102e98000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc90000117630 R08: ffffffff9032faf7 R09: 1ffffffff2065f5e
R10: dffffc0000000000 R11: fffffbfff2065f5f R12: dffffc0000000000
R13: 1ffff92000022ea4 R14: 00000000000008c0 R15: ffff88816b068818
FS: 0000000000000000(0000) GS:ffff88818dc23000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb0fefe8158 CR3: 0000000113c9a000 CR4: 00000000000006f0
Call Trace:
<TASK>
macvlan_port_destroy+0x2eb/0x310 drivers/net/macvlan.c:1343
unregister_netdevice_many_notify+0x1ad2/0x2150 net/core/dev.c:12464
unregister_netdevice_many net/core/dev.c:12506 [inline]
default_device_exit_batch+0x961/0x9e0 net/core/dev.c:13098
ops_exit_list net/core/net_namespace.c:205 [inline]
ops_undo_list+0x4b4/0x8d0 net/core/net_namespace.c:252
cleanup_net+0x572/0x810 net/core/net_namespace.c:702
process_one_work kernel/workqueue.c:3322 [inline]
process_scheduled_works+0xa8e/0x14e0 kernel/workqueue.c:3405
worker_thread+0xa47/0xfb0 kernel/workqueue.c:3486
kthread+0x388/0x470 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:macvlan_passthru drivers/net/macvlan.c:78 [inline]
RIP: 0010:macvlan_port_release_mac+0x138/0x490 drivers/net/macvlan.c:807
Code: 01 00 00 48 89 d8 48 c1 e8 03 42 80 3c 20 00 74 08 48 89 df e8 b9 30 ae fb 48 8b 1b 4c 8d b3 c0 08 00 00 4c 89 f0 48 c1 e8 03 <42> 0f b6 04 20 84 c0 0f 85 44 02 00 00 45 8b 36 44 89 f6 83 e6 01
RSP: 0018:ffffc90000117500 EFLAGS: 00010206
RAX: 0000000000000118 RBX: 0000000000000000 RCX: ffff888102e98000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc90000117630 R08: ffffffff9032faf7 R09: 1ffffffff2065f5e
R10: dffffc0000000000 R11: fffffbfff2065f5f R12: dffffc0000000000
R13: 1ffff92000022ea4 R14: 00000000000008c0 R15: ffff88816b068818
FS: 0000000000000000(0000) GS:ffff88818dc23000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b33163fff CR3: 0000000175a06000 CR4: 00000000000006f0
----------------
Code disassembly (best guess):
0: 01 00 add %eax,(%rax)
2: 00 48 89 add %cl,-0x77(%rax)
5: d8 48 c1 fmuls -0x3f(%rax)
8: e8 03 42 80 3c call 0x3c804210
d: 20 00 and %al,(%rax)
f: 74 08 je 0x19
11: 48 89 df mov %rbx,%rdi
14: e8 b9 30 ae fb call 0xfbae30d2
19: 48 8b 1b mov (%rbx),%rbx
1c: 4c 8d b3 c0 08 00 00 lea 0x8c0(%rbx),%r14
23: 4c 89 f0 mov %r14,%rax
26: 48 c1 e8 03 shr $0x3,%rax
* 2a: 42 0f b6 04 20 movzbl (%rax,%r12,1),%eax <-- trapping instruction
2f: 84 c0 test %al,%al
31: 0f 85 44 02 00 00 jne 0x27b
37: 45 8b 36 mov (%r14),%r14d
3a: 44 89 f6 mov %r14d,%esi
3d: 83 e6 01 and $0x1,%esi
***
If these findings have caused you to resend the series or submit a
separate fix, please add the following tag to your commit message:
Tested-by: syzbot@syzkaller.appspotmail.com
---
This report is generated by a bot. It may contain errors.
syzbot ci engineers can be reached at syzkaller@googlegroups.com.
To test a patch for this bug, please reply with `#syz test`
(should be on a separate line).
The patch should be attached to the email.
Note: arguments like custom git repos and branches are not supported.
The email will later be sent to:
[andrew@lunn.ch davem@davemloft.net edumazet@google.com horms@kernel.org kuba@kernel.org linux-kernel@vger.kernel.org netdev@vger.kernel.org pabeni@redhat.com t.martitz@fritz.com]
If the report looks fine to you, reply with:
#syz upstream
If the report is a false positive, reply with
#syz invalid
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [moderation/CI] Re: macvlan: allow source mode devices along with passthru
2026-07-10 9:28 [moderation/CI] Re: macvlan: allow source mode devices along with passthru syzbot ci
@ 2026-07-10 9:54 ` Pimyn Girgis
0 siblings, 0 replies; 4+ messages in thread
From: Pimyn Girgis @ 2026-07-10 9:54 UTC (permalink / raw)
To: syzbot ci; +Cc: syzkaller-upstream-moderation, syzbot
#syz upstream
On Fri, Jul 10, 2026 at 11:28 AM syzbot ci
<syzbot+ci8d333e09229b69c8@syzkaller.appspotmail.com> wrote:
>
> syzbot ci has tested the following series
>
> [v2] macvlan: allow source mode devices along with passthru
> https://lore.kernel.org/all/20260709100512.1383421-1-t.martitz@fritz.com
> * [PATCH v2 1/1] macvlan: allow source mode devices along with passthru
>
> and found the following issue:
> general protection fault in macvlan_port_release_mac
>
> Full report is available here:
> https://ci.syzbot.org/series/2632619d-fb66-47ac-85a1-a781bbb0d57d
>
> ***
>
> general protection fault in macvlan_port_release_mac
>
> tree: net-next
> URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/netdev/net-next.git
> base: fe3e786ef4eb6e47d2901f568a27bd920477bbe9
> arch: amd64
> compiler: Debian clang version 22.1.6 (++20260514074242+fc4aad7b5db3-1~exp1~20260514074407.73), Debian LLD 22.1.6
> config: https://ci.syzbot.org/builds/90f86060-ab12-43d6-a718-5d0f5eb5df09/config
> syz repro: https://ci.syzbot.org/findings/d1f12788-51d7-4251-8fc9-6bfda6a1e20a/syz_repro
>
> batman_adv: batadv0: Removing interface: batadv_slave_1
> veth1_macvtap: left promiscuous mode
> veth0_macvtap: left promiscuous mode
> veth1_vlan: left promiscuous mode
> veth0_vlan: left promiscuous mode
> Oops: general protection fault, probably for non-canonical address 0xdffffc0000000118: 0000 [#1] SMP KASAN PTI
> KASAN: null-ptr-deref in range [0x00000000000008c0-0x00000000000008c7]
> CPU: 0 UID: 0 PID: 12 Comm: kworker/u8:0 Not tainted syzkaller #0 PREEMPT(full)
> Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
> Workqueue: netns cleanup_net
> RIP: 0010:macvlan_passthru drivers/net/macvlan.c:78 [inline]
> RIP: 0010:macvlan_port_release_mac+0x138/0x490 drivers/net/macvlan.c:807
> Code: 01 00 00 48 89 d8 48 c1 e8 03 42 80 3c 20 00 74 08 48 89 df e8 b9 30 ae fb 48 8b 1b 4c 8d b3 c0 08 00 00 4c 89 f0 48 c1 e8 03 <42> 0f b6 04 20 84 c0 0f 85 44 02 00 00 45 8b 36 44 89 f6 83 e6 01
> RSP: 0018:ffffc90000117500 EFLAGS: 00010206
> RAX: 0000000000000118 RBX: 0000000000000000 RCX: ffff888102e98000
> RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
> RBP: ffffc90000117630 R08: ffffffff9032faf7 R09: 1ffffffff2065f5e
> R10: dffffc0000000000 R11: fffffbfff2065f5f R12: dffffc0000000000
> R13: 1ffff92000022ea4 R14: 00000000000008c0 R15: ffff88816b068818
> FS: 0000000000000000(0000) GS:ffff88818dc23000(0000) knlGS:0000000000000000
> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 00007fb0fefe8158 CR3: 0000000113c9a000 CR4: 00000000000006f0
> Call Trace:
> <TASK>
> macvlan_port_destroy+0x2eb/0x310 drivers/net/macvlan.c:1343
> unregister_netdevice_many_notify+0x1ad2/0x2150 net/core/dev.c:12464
> unregister_netdevice_many net/core/dev.c:12506 [inline]
> default_device_exit_batch+0x961/0x9e0 net/core/dev.c:13098
> ops_exit_list net/core/net_namespace.c:205 [inline]
> ops_undo_list+0x4b4/0x8d0 net/core/net_namespace.c:252
> cleanup_net+0x572/0x810 net/core/net_namespace.c:702
> process_one_work kernel/workqueue.c:3322 [inline]
> process_scheduled_works+0xa8e/0x14e0 kernel/workqueue.c:3405
> worker_thread+0xa47/0xfb0 kernel/workqueue.c:3486
> kthread+0x388/0x470 kernel/kthread.c:436
> ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
> ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
> </TASK>
> Modules linked in:
> ---[ end trace 0000000000000000 ]---
> RIP: 0010:macvlan_passthru drivers/net/macvlan.c:78 [inline]
> RIP: 0010:macvlan_port_release_mac+0x138/0x490 drivers/net/macvlan.c:807
> Code: 01 00 00 48 89 d8 48 c1 e8 03 42 80 3c 20 00 74 08 48 89 df e8 b9 30 ae fb 48 8b 1b 4c 8d b3 c0 08 00 00 4c 89 f0 48 c1 e8 03 <42> 0f b6 04 20 84 c0 0f 85 44 02 00 00 45 8b 36 44 89 f6 83 e6 01
> RSP: 0018:ffffc90000117500 EFLAGS: 00010206
> RAX: 0000000000000118 RBX: 0000000000000000 RCX: ffff888102e98000
> RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
> RBP: ffffc90000117630 R08: ffffffff9032faf7 R09: 1ffffffff2065f5e
> R10: dffffc0000000000 R11: fffffbfff2065f5f R12: dffffc0000000000
> R13: 1ffff92000022ea4 R14: 00000000000008c0 R15: ffff88816b068818
> FS: 0000000000000000(0000) GS:ffff88818dc23000(0000) knlGS:0000000000000000
> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 0000001b33163fff CR3: 0000000175a06000 CR4: 00000000000006f0
> ----------------
> Code disassembly (best guess):
> 0: 01 00 add %eax,(%rax)
> 2: 00 48 89 add %cl,-0x77(%rax)
> 5: d8 48 c1 fmuls -0x3f(%rax)
> 8: e8 03 42 80 3c call 0x3c804210
> d: 20 00 and %al,(%rax)
> f: 74 08 je 0x19
> 11: 48 89 df mov %rbx,%rdi
> 14: e8 b9 30 ae fb call 0xfbae30d2
> 19: 48 8b 1b mov (%rbx),%rbx
> 1c: 4c 8d b3 c0 08 00 00 lea 0x8c0(%rbx),%r14
> 23: 4c 89 f0 mov %r14,%rax
> 26: 48 c1 e8 03 shr $0x3,%rax
> * 2a: 42 0f b6 04 20 movzbl (%rax,%r12,1),%eax <-- trapping instruction
> 2f: 84 c0 test %al,%al
> 31: 0f 85 44 02 00 00 jne 0x27b
> 37: 45 8b 36 mov (%r14),%r14d
> 3a: 44 89 f6 mov %r14d,%esi
> 3d: 83 e6 01 and $0x1,%esi
>
>
> ***
>
> If these findings have caused you to resend the series or submit a
> separate fix, please add the following tag to your commit message:
> Tested-by: syzbot@syzkaller.appspotmail.com
>
> ---
> This report is generated by a bot. It may contain errors.
> syzbot ci engineers can be reached at syzkaller@googlegroups.com.
>
> To test a patch for this bug, please reply with `#syz test`
> (should be on a separate line).
>
> The patch should be attached to the email.
> Note: arguments like custom git repos and branches are not supported.
>
> The email will later be sent to:
> [andrew@lunn.ch davem@davemloft.net edumazet@google.com horms@kernel.org kuba@kernel.org linux-kernel@vger.kernel.org netdev@vger.kernel.org pabeni@redhat.com t.martitz@fritz.com]
>
> If the report looks fine to you, reply with:
> #syz upstream
>
> If the report is a false positive, reply with
> #syz invalid
>
> --
> You received this message because you are subscribed to the Google Groups "syzkaller-upstream-moderation" group.
> To unsubscribe from this group and stop receiving emails from it, send an email to syzkaller-upstream-moderation+unsubscribe@googlegroups.com.
> To view this discussion visit https://groups.google.com/d/msgid/syzkaller-upstream-moderation/6a50bb37.57639fcc.86d58.0025.GAE%40google.com.
--
Ⲡⲟⲓⲙⲏⲛ Ⲅⲉⲱⲣⲅⲓⲟⲥ - Pimyn Girgis
Software Engineer
Kernel Dynamic Analysis
pimyn@google.com
^ permalink raw reply [flat|nested] 4+ messages in thread
* [moderation/CI] Re: macvlan: allow source mode devices along with passthru
@ 2026-07-10 6:47 syzbot ci
2026-07-10 7:46 ` Pimyn Girgis
0 siblings, 1 reply; 4+ messages in thread
From: syzbot ci @ 2026-07-10 6:47 UTC (permalink / raw)
To: syzkaller-upstream-moderation; +Cc: syzbot
syzbot ci has tested the following series
[v2] macvlan: allow source mode devices along with passthru
https://lore.kernel.org/all/20260709091138.170348-1-t.martitz@fritz.com
* [PATCH v2 1/1] macvlan: allow source mode devices along with passthru
and found the following issue:
general protection fault in macvlan_port_release_mac
Full report is available here:
https://ci.syzbot.org/series/72476997-558e-41ae-b146-c05346cdd7f6
***
general protection fault in macvlan_port_release_mac
tree: net-next
URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/netdev/net-next.git
base: fe3e786ef4eb6e47d2901f568a27bd920477bbe9
arch: amd64
compiler: Debian clang version 22.1.6 (++20260514074242+fc4aad7b5db3-1~exp1~20260514074407.73), Debian LLD 22.1.6
config: https://ci.syzbot.org/builds/0c5e2f82-62bd-40bf-a873-66f277607c07/config
syz repro: https://ci.syzbot.org/findings/d5d14725-5a48-484c-876d-026175d0b21a/syz_repro
batman_adv: batadv0: Removing interface: batadv_slave_1
veth1_macvtap: left promiscuous mode
veth0_macvtap: left promiscuous mode
veth1_vlan: left promiscuous mode
veth0_vlan: left promiscuous mode
Oops: general protection fault, probably for non-canonical address 0xdffffc0000000118: 0000 [#1] SMP KASAN PTI
KASAN: null-ptr-deref in range [0x00000000000008c0-0x00000000000008c7]
CPU: 1 UID: 0 PID: 13 Comm: kworker/u8:1 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Workqueue: netns cleanup_net
RIP: 0010:macvlan_passthru drivers/net/macvlan.c:78 [inline]
RIP: 0010:macvlan_port_release_mac+0x138/0x490 drivers/net/macvlan.c:807
Code: 01 00 00 48 89 d8 48 c1 e8 03 42 80 3c 20 00 74 08 48 89 df e8 b9 30 ae fb 48 8b 1b 4c 8d b3 c0 08 00 00 4c 89 f0 48 c1 e8 03 <42> 0f b6 04 20 84 c0 0f 85 44 02 00 00 45 8b 36 44 89 f6 83 e6 01
RSP: 0018:ffffc90000127500 EFLAGS: 00010206
RAX: 0000000000000118 RBX: 0000000000000000 RCX: ffff888102ec5940
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc90000127630 R08: ffffffff9032faf7 R09: 1ffffffff2065f5e
R10: dffffc0000000000 R11: fffffbfff2065f5f R12: dffffc0000000000
R13: 1ffff92000024ea4 R14: 00000000000008c0 R15: ffff888109b28818
FS: 0000000000000000(0000) GS:ffff8882a9223000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffefe7250d8 CR3: 000000000e746000 CR4: 00000000000006f0
Call Trace:
<TASK>
macvlan_port_destroy+0x2eb/0x310 drivers/net/macvlan.c:1343
unregister_netdevice_many_notify+0x1ad2/0x2150 net/core/dev.c:12464
unregister_netdevice_many net/core/dev.c:12506 [inline]
default_device_exit_batch+0x961/0x9e0 net/core/dev.c:13098
ops_exit_list net/core/net_namespace.c:205 [inline]
ops_undo_list+0x4b4/0x8d0 net/core/net_namespace.c:252
cleanup_net+0x572/0x810 net/core/net_namespace.c:702
process_one_work kernel/workqueue.c:3322 [inline]
process_scheduled_works+0xa8e/0x14e0 kernel/workqueue.c:3405
worker_thread+0xa47/0xfb0 kernel/workqueue.c:3486
kthread+0x388/0x470 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:macvlan_passthru drivers/net/macvlan.c:78 [inline]
RIP: 0010:macvlan_port_release_mac+0x138/0x490 drivers/net/macvlan.c:807
Code: 01 00 00 48 89 d8 48 c1 e8 03 42 80 3c 20 00 74 08 48 89 df e8 b9 30 ae fb 48 8b 1b 4c 8d b3 c0 08 00 00 4c 89 f0 48 c1 e8 03 <42> 0f b6 04 20 84 c0 0f 85 44 02 00 00 45 8b 36 44 89 f6 83 e6 01
RSP: 0018:ffffc90000127500 EFLAGS: 00010206
RAX: 0000000000000118 RBX: 0000000000000000 RCX: ffff888102ec5940
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc90000127630 R08: ffffffff9032faf7 R09: 1ffffffff2065f5e
R10: dffffc0000000000 R11: fffffbfff2065f5f R12: dffffc0000000000
R13: 1ffff92000024ea4 R14: 00000000000008c0 R15: ffff888109b28818
FS: 0000000000000000(0000) GS:ffff8882a9223000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffefe7250d8 CR3: 000000000e746000 CR4: 00000000000006f0
----------------
Code disassembly (best guess):
0: 01 00 add %eax,(%rax)
2: 00 48 89 add %cl,-0x77(%rax)
5: d8 48 c1 fmuls -0x3f(%rax)
8: e8 03 42 80 3c call 0x3c804210
d: 20 00 and %al,(%rax)
f: 74 08 je 0x19
11: 48 89 df mov %rbx,%rdi
14: e8 b9 30 ae fb call 0xfbae30d2
19: 48 8b 1b mov (%rbx),%rbx
1c: 4c 8d b3 c0 08 00 00 lea 0x8c0(%rbx),%r14
23: 4c 89 f0 mov %r14,%rax
26: 48 c1 e8 03 shr $0x3,%rax
* 2a: 42 0f b6 04 20 movzbl (%rax,%r12,1),%eax <-- trapping instruction
2f: 84 c0 test %al,%al
31: 0f 85 44 02 00 00 jne 0x27b
37: 45 8b 36 mov (%r14),%r14d
3a: 44 89 f6 mov %r14d,%esi
3d: 83 e6 01 and $0x1,%esi
***
If these findings have caused you to resend the series or submit a
separate fix, please add the following tag to your commit message:
Tested-by: syzbot@syzkaller.appspotmail.com
---
This report is generated by a bot. It may contain errors.
syzbot ci engineers can be reached at syzkaller@googlegroups.com.
To test a patch for this bug, please reply with `#syz test`
(should be on a separate line).
The patch should be attached to the email.
Note: arguments like custom git repos and branches are not supported.
The email will later be sent to:
[andrew@lunn.ch davem@davemloft.net edumazet@google.com horms@kernel.org kuba@kernel.org linux-kernel@vger.kernel.org netdev@vger.kernel.org pabeni@redhat.com t.martitz@fritz.com]
If the report looks fine to you, reply with:
#syz upstream
If the report is a false positive, reply with
#syz invalid
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [moderation/CI] Re: macvlan: allow source mode devices along with passthru
2026-07-10 6:47 syzbot ci
@ 2026-07-10 7:46 ` Pimyn Girgis
0 siblings, 0 replies; 4+ messages in thread
From: Pimyn Girgis @ 2026-07-10 7:46 UTC (permalink / raw)
To: syzbot ci; +Cc: syzkaller-upstream-moderation, syzbot
#syz upstream
On Fri, Jul 10, 2026 at 8:47 AM syzbot ci
<syzbot+cid152941003025f4b@syzkaller.appspotmail.com> wrote:
>
> syzbot ci has tested the following series
>
> [v2] macvlan: allow source mode devices along with passthru
> https://lore.kernel.org/all/20260709091138.170348-1-t.martitz@fritz.com
> * [PATCH v2 1/1] macvlan: allow source mode devices along with passthru
>
> and found the following issue:
> general protection fault in macvlan_port_release_mac
>
> Full report is available here:
> https://ci.syzbot.org/series/72476997-558e-41ae-b146-c05346cdd7f6
>
> ***
>
> general protection fault in macvlan_port_release_mac
>
> tree: net-next
> URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/netdev/net-next.git
> base: fe3e786ef4eb6e47d2901f568a27bd920477bbe9
> arch: amd64
> compiler: Debian clang version 22.1.6 (++20260514074242+fc4aad7b5db3-1~exp1~20260514074407.73), Debian LLD 22.1.6
> config: https://ci.syzbot.org/builds/0c5e2f82-62bd-40bf-a873-66f277607c07/config
> syz repro: https://ci.syzbot.org/findings/d5d14725-5a48-484c-876d-026175d0b21a/syz_repro
>
> batman_adv: batadv0: Removing interface: batadv_slave_1
> veth1_macvtap: left promiscuous mode
> veth0_macvtap: left promiscuous mode
> veth1_vlan: left promiscuous mode
> veth0_vlan: left promiscuous mode
> Oops: general protection fault, probably for non-canonical address 0xdffffc0000000118: 0000 [#1] SMP KASAN PTI
> KASAN: null-ptr-deref in range [0x00000000000008c0-0x00000000000008c7]
> CPU: 1 UID: 0 PID: 13 Comm: kworker/u8:1 Not tainted syzkaller #0 PREEMPT(full)
> Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
> Workqueue: netns cleanup_net
> RIP: 0010:macvlan_passthru drivers/net/macvlan.c:78 [inline]
> RIP: 0010:macvlan_port_release_mac+0x138/0x490 drivers/net/macvlan.c:807
> Code: 01 00 00 48 89 d8 48 c1 e8 03 42 80 3c 20 00 74 08 48 89 df e8 b9 30 ae fb 48 8b 1b 4c 8d b3 c0 08 00 00 4c 89 f0 48 c1 e8 03 <42> 0f b6 04 20 84 c0 0f 85 44 02 00 00 45 8b 36 44 89 f6 83 e6 01
> RSP: 0018:ffffc90000127500 EFLAGS: 00010206
> RAX: 0000000000000118 RBX: 0000000000000000 RCX: ffff888102ec5940
> RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
> RBP: ffffc90000127630 R08: ffffffff9032faf7 R09: 1ffffffff2065f5e
> R10: dffffc0000000000 R11: fffffbfff2065f5f R12: dffffc0000000000
> R13: 1ffff92000024ea4 R14: 00000000000008c0 R15: ffff888109b28818
> FS: 0000000000000000(0000) GS:ffff8882a9223000(0000) knlGS:0000000000000000
> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 00007ffefe7250d8 CR3: 000000000e746000 CR4: 00000000000006f0
> Call Trace:
> <TASK>
> macvlan_port_destroy+0x2eb/0x310 drivers/net/macvlan.c:1343
> unregister_netdevice_many_notify+0x1ad2/0x2150 net/core/dev.c:12464
> unregister_netdevice_many net/core/dev.c:12506 [inline]
> default_device_exit_batch+0x961/0x9e0 net/core/dev.c:13098
> ops_exit_list net/core/net_namespace.c:205 [inline]
> ops_undo_list+0x4b4/0x8d0 net/core/net_namespace.c:252
> cleanup_net+0x572/0x810 net/core/net_namespace.c:702
> process_one_work kernel/workqueue.c:3322 [inline]
> process_scheduled_works+0xa8e/0x14e0 kernel/workqueue.c:3405
> worker_thread+0xa47/0xfb0 kernel/workqueue.c:3486
> kthread+0x388/0x470 kernel/kthread.c:436
> ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
> ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
> </TASK>
> Modules linked in:
> ---[ end trace 0000000000000000 ]---
> RIP: 0010:macvlan_passthru drivers/net/macvlan.c:78 [inline]
> RIP: 0010:macvlan_port_release_mac+0x138/0x490 drivers/net/macvlan.c:807
> Code: 01 00 00 48 89 d8 48 c1 e8 03 42 80 3c 20 00 74 08 48 89 df e8 b9 30 ae fb 48 8b 1b 4c 8d b3 c0 08 00 00 4c 89 f0 48 c1 e8 03 <42> 0f b6 04 20 84 c0 0f 85 44 02 00 00 45 8b 36 44 89 f6 83 e6 01
> RSP: 0018:ffffc90000127500 EFLAGS: 00010206
> RAX: 0000000000000118 RBX: 0000000000000000 RCX: ffff888102ec5940
> RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
> RBP: ffffc90000127630 R08: ffffffff9032faf7 R09: 1ffffffff2065f5e
> R10: dffffc0000000000 R11: fffffbfff2065f5f R12: dffffc0000000000
> R13: 1ffff92000024ea4 R14: 00000000000008c0 R15: ffff888109b28818
> FS: 0000000000000000(0000) GS:ffff8882a9223000(0000) knlGS:0000000000000000
> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 00007ffefe7250d8 CR3: 000000000e746000 CR4: 00000000000006f0
> ----------------
> Code disassembly (best guess):
> 0: 01 00 add %eax,(%rax)
> 2: 00 48 89 add %cl,-0x77(%rax)
> 5: d8 48 c1 fmuls -0x3f(%rax)
> 8: e8 03 42 80 3c call 0x3c804210
> d: 20 00 and %al,(%rax)
> f: 74 08 je 0x19
> 11: 48 89 df mov %rbx,%rdi
> 14: e8 b9 30 ae fb call 0xfbae30d2
> 19: 48 8b 1b mov (%rbx),%rbx
> 1c: 4c 8d b3 c0 08 00 00 lea 0x8c0(%rbx),%r14
> 23: 4c 89 f0 mov %r14,%rax
> 26: 48 c1 e8 03 shr $0x3,%rax
> * 2a: 42 0f b6 04 20 movzbl (%rax,%r12,1),%eax <-- trapping instruction
> 2f: 84 c0 test %al,%al
> 31: 0f 85 44 02 00 00 jne 0x27b
> 37: 45 8b 36 mov (%r14),%r14d
> 3a: 44 89 f6 mov %r14d,%esi
> 3d: 83 e6 01 and $0x1,%esi
>
>
> ***
>
> If these findings have caused you to resend the series or submit a
> separate fix, please add the following tag to your commit message:
> Tested-by: syzbot@syzkaller.appspotmail.com
>
> ---
> This report is generated by a bot. It may contain errors.
> syzbot ci engineers can be reached at syzkaller@googlegroups.com.
>
> To test a patch for this bug, please reply with `#syz test`
> (should be on a separate line).
>
> The patch should be attached to the email.
> Note: arguments like custom git repos and branches are not supported.
>
> The email will later be sent to:
> [andrew@lunn.ch davem@davemloft.net edumazet@google.com horms@kernel.org kuba@kernel.org linux-kernel@vger.kernel.org netdev@vger.kernel.org pabeni@redhat.com t.martitz@fritz.com]
>
> If the report looks fine to you, reply with:
> #syz upstream
>
> If the report is a false positive, reply with
> #syz invalid
>
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--
Ⲡⲟⲓⲙⲏⲛ Ⲅⲉⲱⲣⲅⲓⲟⲥ - Pimyn Girgis
Software Engineer
Kernel Dynamic Analysis
pimyn@google.com
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2026-07-10 9:28 [moderation/CI] Re: macvlan: allow source mode devices along with passthru syzbot ci
2026-07-10 9:54 ` Pimyn Girgis
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2026-07-10 6:47 syzbot ci
2026-07-10 7:46 ` Pimyn Girgis
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