* [syzbot] [net?] BUG: sleeping function called from invalid context in netif_rx_mode_run
@ 2026-05-29 22:03 syzbot
2026-06-01 15:37 ` Stanislav Fomichev
0 siblings, 1 reply; 2+ messages in thread
From: syzbot @ 2026-05-29 22:03 UTC (permalink / raw)
To: davem, edumazet, horms, kuba, linux-kernel, netdev, pabeni,
syzkaller-bugs
Hello,
syzbot found the following issue on:
HEAD commit: 4b4362973b6f Merge branch 'for-next/core' into for-kernelci
git tree: git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci
console output: https://syzkaller.appspot.com/x/log.txt?x=14a4c62e580000
kernel config: https://syzkaller.appspot.com/x/.config?x=a834c6344141a58b
dashboard link: https://syzkaller.appspot.com/bug?extid=b54df935b5872a351231
compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8
userspace arch: arm64
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/f69f86c90ee5/disk-4b436297.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/79fa7b33aaab/vmlinux-4b436297.xz
kernel image: https://storage.googleapis.com/syzbot-assets/ef080156d0de/Image-4b436297.gz.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+b54df935b5872a351231@syzkaller.appspotmail.com
netlink: 28 bytes leftover after parsing attributes in process `syz.8.1045'.
vlan2: left promiscuous mode
geneve0: left promiscuous mode
BUG: sleeping function called from invalid context at net/core/dev_addr_lists.c:1262
in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 13679, name: syz.8.1045
preempt_count: 201, expected: 0
RCU nest depth: 0, expected: 0
2 locks held by syz.8.1045/13679:
#0: ffff800089b97600 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtnetlink.c:80 [inline]
#0: ffff800089b97600 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_nets_lock+0x38/0x10c net/core/rtnetlink.c:341
#1: ffff0000d6170e58 (&br->lock){+.-.}-{3:3}, at: spin_lock_bh include/linux/spinlock.h:348 [inline]
#1: ffff0000d6170e58 (&br->lock){+.-.}-{3:3}, at: br_port_slave_changelink+0x40/0x15c net/bridge/br_netlink.c:1212
Preemption disabled at:
[<ffff8000857ffa50>] spin_lock_bh include/linux/spinlock.h:348 [inline]
[<ffff8000857ffa50>] br_port_slave_changelink+0x40/0x15c net/bridge/br_netlink.c:1212
CPU: 0 UID: 0 PID: 13679 Comm: syz.8.1045 Tainted: G L syzkaller #0 PREEMPT
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
Call trace:
show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:499 (C)
__dump_stack+0x30/0x40 lib/dump_stack.c:94
dump_stack_lvl+0xd8/0x12c lib/dump_stack.c:120
dump_stack+0x1c/0x28 lib/dump_stack.c:129
__might_resched+0x350/0x4ac kernel/sched/core.c:9163
__might_sleep+0x84/0xdc kernel/sched/core.c:9092
netif_rx_mode_run+0x124/0xb64 net/core/dev_addr_lists.c:1262
netif_rx_mode_sync+0x2c/0xbc net/core/dev_addr_lists.c:1428
dev_set_promiscuity+0x110/0x1fc net/core/dev_api.c:289
br_port_clear_promisc net/bridge/br_if.c:135 [inline]
br_manage_promisc+0x2c0/0x33c net/bridge/br_if.c:172
nbp_update_port_count+0xf8/0x148 net/bridge/br_if.c:242
br_port_flags_change+0x60/0xa8 net/bridge/br_if.c:747
br_setport+0xac4/0x1230 net/bridge/br_netlink.c:1000
br_port_slave_changelink+0x134/0x15c net/bridge/br_netlink.c:1213
rtnl_changelink net/core/rtnetlink.c:3793 [inline]
__rtnl_newlink net/core/rtnetlink.c:3973 [inline]
rtnl_newlink+0xf80/0x113c net/core/rtnetlink.c:4110
rtnetlink_rcv_msg+0x66c/0x9c8 net/core/rtnetlink.c:6996
netlink_rcv_skb+0x22c/0x410 net/netlink/af_netlink.c:2550
rtnetlink_rcv+0x28/0x38 net/core/rtnetlink.c:7023
netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
netlink_unicast+0x610/0x800 net/netlink/af_netlink.c:1344
netlink_sendmsg+0x63c/0x920 net/netlink/af_netlink.c:1894
sock_sendmsg_nosec net/socket.c:787 [inline]
__sock_sendmsg+0xc8/0x138 net/socket.c:802
____sys_sendmsg+0x418/0x70c net/socket.c:2698
___sys_sendmsg+0x198/0x224 net/socket.c:2752
__sys_sendmsg+0x160/0x214 net/socket.c:2784
__do_sys_sendmsg net/socket.c:2789 [inline]
__se_sys_sendmsg net/socket.c:2787 [inline]
__arm64_sys_sendmsg+0x80/0x94 net/socket.c:2787
__invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49
el0_svc_common+0xe8/0x23c arch/arm64/kernel/syscall.c:121
do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:140
el0_svc+0x64/0x260 arch/arm64/kernel/entry-common.c:740
el0t_64_sync_handler+0x48/0x148 arch/arm64/kernel/entry-common.c:759
el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:594
geneve0: entered promiscuous mode
bridge0: port 2(bridge_slave_1) entered disabled state
bridge_slave_1: left allmulticast mode
bridge_slave_1: left promiscuous mode
bridge0: port 2(bridge_slave_1) entered disabled state
---
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.
If the report is already addressed, let syzbot know by replying with:
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If you want to overwrite report's subsystems, reply with:
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If the report is a duplicate of another one, reply with:
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If you want to undo deduplication, reply with:
#syz undup
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [syzbot] [net?] BUG: sleeping function called from invalid context in netif_rx_mode_run
2026-05-29 22:03 [syzbot] [net?] BUG: sleeping function called from invalid context in netif_rx_mode_run syzbot
@ 2026-06-01 15:37 ` Stanislav Fomichev
0 siblings, 0 replies; 2+ messages in thread
From: Stanislav Fomichev @ 2026-06-01 15:37 UTC (permalink / raw)
To: syzbot
Cc: davem, edumazet, horms, kuba, linux-kernel, netdev, pabeni,
syzkaller-bugs
On 05/29, syzbot wrote:
> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit: 4b4362973b6f Merge branch 'for-next/core' into for-kernelci
> git tree: git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci
> console output: https://syzkaller.appspot.com/x/log.txt?x=14a4c62e580000
> kernel config: https://syzkaller.appspot.com/x/.config?x=a834c6344141a58b
> dashboard link: https://syzkaller.appspot.com/bug?extid=b54df935b5872a351231
> compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8
> userspace arch: arm64
>
> Unfortunately, I don't have any reproducer for this issue yet.
>
> Downloadable assets:
> disk image: https://storage.googleapis.com/syzbot-assets/f69f86c90ee5/disk-4b436297.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/79fa7b33aaab/vmlinux-4b436297.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/ef080156d0de/Image-4b436297.gz.xz
>
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+b54df935b5872a351231@syzkaller.appspotmail.com
>
> netlink: 28 bytes leftover after parsing attributes in process `syz.8.1045'.
> vlan2: left promiscuous mode
> geneve0: left promiscuous mode
> BUG: sleeping function called from invalid context at net/core/dev_addr_lists.c:1262
> in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 13679, name: syz.8.1045
> preempt_count: 201, expected: 0
> RCU nest depth: 0, expected: 0
> 2 locks held by syz.8.1045/13679:
> #0: ffff800089b97600 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtnetlink.c:80 [inline]
> #0: ffff800089b97600 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_nets_lock+0x38/0x10c net/core/rtnetlink.c:341
> #1: ffff0000d6170e58 (&br->lock){+.-.}-{3:3}, at: spin_lock_bh include/linux/spinlock.h:348 [inline]
> #1: ffff0000d6170e58 (&br->lock){+.-.}-{3:3}, at: br_port_slave_changelink+0x40/0x15c net/bridge/br_netlink.c:1212
> Preemption disabled at:
> [<ffff8000857ffa50>] spin_lock_bh include/linux/spinlock.h:348 [inline]
> [<ffff8000857ffa50>] br_port_slave_changelink+0x40/0x15c net/bridge/br_netlink.c:1212
> CPU: 0 UID: 0 PID: 13679 Comm: syz.8.1045 Tainted: G L syzkaller #0 PREEMPT
> Tainted: [L]=SOFTLOCKUP
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
> Call trace:
> show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:499 (C)
> __dump_stack+0x30/0x40 lib/dump_stack.c:94
> dump_stack_lvl+0xd8/0x12c lib/dump_stack.c:120
> dump_stack+0x1c/0x28 lib/dump_stack.c:129
> __might_resched+0x350/0x4ac kernel/sched/core.c:9163
> __might_sleep+0x84/0xdc kernel/sched/core.c:9092
> netif_rx_mode_run+0x124/0xb64 net/core/dev_addr_lists.c:1262
> netif_rx_mode_sync+0x2c/0xbc net/core/dev_addr_lists.c:1428
> dev_set_promiscuity+0x110/0x1fc net/core/dev_api.c:289
> br_port_clear_promisc net/bridge/br_if.c:135 [inline]
> br_manage_promisc+0x2c0/0x33c net/bridge/br_if.c:172
> nbp_update_port_count+0xf8/0x148 net/bridge/br_if.c:242
> br_port_flags_change+0x60/0xa8 net/bridge/br_if.c:747
> br_setport+0xac4/0x1230 net/bridge/br_netlink.c:1000
> br_port_slave_changelink+0x134/0x15c net/bridge/br_netlink.c:1213
> rtnl_changelink net/core/rtnetlink.c:3793 [inline]
> __rtnl_newlink net/core/rtnetlink.c:3973 [inline]
> rtnl_newlink+0xf80/0x113c net/core/rtnetlink.c:4110
> rtnetlink_rcv_msg+0x66c/0x9c8 net/core/rtnetlink.c:6996
> netlink_rcv_skb+0x22c/0x410 net/netlink/af_netlink.c:2550
> rtnetlink_rcv+0x28/0x38 net/core/rtnetlink.c:7023
> netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
> netlink_unicast+0x610/0x800 net/netlink/af_netlink.c:1344
> netlink_sendmsg+0x63c/0x920 net/netlink/af_netlink.c:1894
> sock_sendmsg_nosec net/socket.c:787 [inline]
> __sock_sendmsg+0xc8/0x138 net/socket.c:802
> ____sys_sendmsg+0x418/0x70c net/socket.c:2698
> ___sys_sendmsg+0x198/0x224 net/socket.c:2752
> __sys_sendmsg+0x160/0x214 net/socket.c:2784
> __do_sys_sendmsg net/socket.c:2789 [inline]
> __se_sys_sendmsg net/socket.c:2787 [inline]
> __arm64_sys_sendmsg+0x80/0x94 net/socket.c:2787
> __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
> invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49
> el0_svc_common+0xe8/0x23c arch/arm64/kernel/syscall.c:121
> do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:140
> el0_svc+0x64/0x260 arch/arm64/kernel/entry-common.c:740
> el0t_64_sync_handler+0x48/0x148 arch/arm64/kernel/entry-common.c:759
> el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:594
> geneve0: entered promiscuous mode
> bridge0: port 2(bridge_slave_1) entered disabled state
> bridge_slave_1: left allmulticast mode
> bridge_slave_1: left promiscuous mode
> bridge0: port 2(bridge_slave_1) entered disabled state
>
>
> ---
> 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.
>
> If the report is already addressed, let syzbot know by replying with:
> #syz fix: exact-commit-title
#syz fix: bridge: Fix sleep in atomic context in netlink path
^ permalink raw reply [flat|nested] 2+ messages in thread
end of thread, other threads:[~2026-06-01 15:37 UTC | newest]
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2026-05-29 22:03 [syzbot] [net?] BUG: sleeping function called from invalid context in netif_rx_mode_run syzbot
2026-06-01 15:37 ` Stanislav Fomichev
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