From: syzbot <syzbot+96046021045ffe6d7709@syzkaller.appspotmail.com>
To: allison.henderson@oracle.com, linux-kernel@vger.kernel.org,
syzkaller-bugs@googlegroups.com
Subject: Re: [syzbot] [rds?] general protection fault in rds_tcp_accept_one
Date: Mon, 09 Feb 2026 20:06:03 -0800 [thread overview]
Message-ID: <698aaeab.050a0220.3b3015.0087.GAE@google.com> (raw)
In-Reply-To: <3a571094912e42265974a30b4e1185511a4b81fb.camel@oracle.com>
Hello,
syzbot has tested the proposed patch but the reproducer is still triggering an issue:
inconsistent lock state in lock_sock_nested
================================
WARNING: inconsistent lock state
syzkaller #0 Not tainted
--------------------------------
inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage.
kworker/u8:5/1106 [HC0[0]:SC1[3]:HE1:SE0] takes:
ffff88801c708260 (k-sk_lock-AF_INET6){+.?.}-{0:0}, at: lock_sock include/net/sock.h:1709 [inline]
ffff88801c708260 (k-sk_lock-AF_INET6){+.?.}-{0:0}, at: inet6_getname+0x15d/0x650 net/ipv6/af_inet6.c:533
{SOFTIRQ-ON-W} state was registered at:
lock_acquire+0x106/0x330 kernel/locking/lockdep.c:5868
lock_sock_nested+0x48/0x100 net/core/sock.c:3780
lock_sock include/net/sock.h:1709 [inline]
tcp_sock_set_nodelay+0x2a/0x180 net/ipv4/tcp.c:3718
rds_tcp_listen_init+0x168/0x410 net/rds/tcp_listen.c:415
rds_tcp_init_net+0x154/0x380 net/rds/tcp.c:568
ops_init+0x35c/0x5c0 net/core/net_namespace.c:137
__register_pernet_operations net/core/net_namespace.c:1320 [inline]
register_pernet_operations+0x343/0x830 net/core/net_namespace.c:1397
register_pernet_device+0x2a/0x80 net/core/net_namespace.c:1484
rds_tcp_init+0xcf/0x170 net/rds/tcp.c:749
do_one_initcall+0x250/0x840 init/main.c:1378
do_initcall_level+0x104/0x190 init/main.c:1440
do_initcalls+0x59/0xa0 init/main.c:1456
kernel_init_freeable+0x2a6/0x3d0 init/main.c:1688
kernel_init+0x1d/0x1d0 init/main.c:1578
ret_from_fork+0x51b/0xa40 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
irq event stamp: 522136
hardirqs last enabled at (522136): [<ffffffff8b98ca40>] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline]
hardirqs last enabled at (522136): [<ffffffff8b98ca40>] _raw_spin_unlock_irqrestore+0x30/0x80 kernel/locking/spinlock.c:194
hardirqs last disabled at (522135): [<ffffffff8b98c89a>] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:108 [inline]
hardirqs last disabled at (522135): [<ffffffff8b98c89a>] _raw_spin_lock_irqsave+0x1a/0x60 kernel/locking/spinlock.c:162
softirqs last enabled at (522108): [<ffffffff89678f94>] local_bh_disable include/linux/bottom_half.h:20 [inline]
softirqs last enabled at (522108): [<ffffffff89678f94>] rcu_read_lock_bh include/linux/rcupdate.h:918 [inline]
softirqs last enabled at (522108): [<ffffffff89678f94>] __dev_queue_xmit+0x274/0x3850 net/core/dev.c:4754
softirqs last disabled at (522109): [<ffffffff818712b6>] do_softirq+0x76/0xd0 kernel/softirq.c:523
other info that might help us debug this:
Possible unsafe locking scenario:
CPU0
----
lock(k-sk_lock-AF_INET6);
<Interrupt>
lock(k-sk_lock-AF_INET6);
*** DEADLOCK ***
12 locks held by kworker/u8:5/1106:
#0: ffff88805f5cb148 ((wq_completion)krds_cp_wq#1/0){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3232 [inline]
#0: ffff88805f5cb148 ((wq_completion)krds_cp_wq#1/0){+.+.}-{0:0}, at: process_scheduled_works+0x9d4/0x17a0 kernel/workqueue.c:3340
#1: ffffc90003a5fbc0 ((work_completion)(&(&cp->cp_send_w)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3233 [inline]
#1: ffffc90003a5fbc0 ((work_completion)(&(&cp->cp_send_w)->work)){+.+.}-{0:0}, at: process_scheduled_works+0xa0f/0x17a0 kernel/workqueue.c:3340
#2: ffff88801c70d1e0 (k-sk_lock-AF_INET6){+.?.}-{0:0}, at: lock_sock include/net/sock.h:1709 [inline]
#2: ffff88801c70d1e0 (k-sk_lock-AF_INET6){+.?.}-{0:0}, at: tcp_sock_set_cork+0x2c/0x2e0 net/ipv4/tcp.c:3694
#3: ffffffff8e75a360 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#3: ffffffff8e75a360 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:867 [inline]
#3: ffffffff8e75a360 (rcu_read_lock){....}-{1:3}, at: inet6_csk_xmit+0x1ee/0x750 net/ipv6/inet6_connection_sock.c:108
#4: ffffffff8e75a360 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#4: ffffffff8e75a360 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:867 [inline]
#4: ffffffff8e75a360 (rcu_read_lock){....}-{1:3}, at: ip6_xmit+0x283/0x1980 net/ipv6/ip6_output.c:284
#5: ffffffff8e75a360 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#5: ffffffff8e75a360 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:867 [inline]
#5: ffffffff8e75a360 (rcu_read_lock){....}-{1:3}, at: ip6_output+0x126/0x550 net/ipv6/ip6_output.c:234
#6: ffffffff8e75a360 (rcu_read_lock){....}-{1:3}, at: local_lock_acquire include/linux/local_lock_internal.h:41 [inline]
#6: ffffffff8e75a360 (rcu_read_lock){....}-{1:3}, at: process_backlog+0x3eb/0x1950 net/core/dev.c:6610
#7: ffffffff8e75a360 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#7: ffffffff8e75a360 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:867 [inline]
#7: ffffffff8e75a360 (rcu_read_lock){....}-{1:3}, at: netif_receive_skb_internal net/core/dev.c:6335 [inline]
#7: ffffffff8e75a360 (rcu_read_lock){....}-{1:3}, at: netif_receive_skb+0x102/0xbb0 net/core/dev.c:6407
#8: ffffffff8e75a360 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#8: ffffffff8e75a360 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:867 [inline]
#8: ffffffff8e75a360 (rcu_read_lock){....}-{1:3}, at: nf_hook include/linux/netfilter.h:242 [inline]
#8: ffffffff8e75a360 (rcu_read_lock){....}-{1:3}, at: NF_HOOK+0x9e/0x3c0 include/linux/netfilter.h:316
#9: ffffffff8e75a360 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#9: ffffffff8e75a360 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:867 [inline]
#9: ffffffff8e75a360 (rcu_read_lock){....}-{1:3}, at: ip6_input+0x23/0x270 net/ipv6/ip6_input.c:499
#10: ffff88801c7081e0 (k-slock-AF_INET6/1){+.-.}-{3:3}, at: tcp_v6_rcv+0x2577/0x2f60 net/ipv6/tcp_ipv6.c:1875
#11: ffff88801c708408 (k-clock-AF_INET6){++.-}-{3:3}, at: rds_tcp_data_ready+0x113/0x950 net/rds/tcp_recv.c:320
stack backtrace:
CPU: 1 UID: 0 PID: 1106 Comm: kworker/u8:5 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026
Workqueue: krds_cp_wq#1/0 rds_send_worker
Call Trace:
<IRQ>
dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
print_usage_bug+0x28b/0x2e0 kernel/locking/lockdep.c:4042
valid_state kernel/locking/lockdep.c:4056 [inline]
mark_lock_irq+0x410/0x420 kernel/locking/lockdep.c:-1
mark_lock+0x115/0x190 kernel/locking/lockdep.c:4753
mark_usage kernel/locking/lockdep.c:-1 [inline]
__lock_acquire+0x689/0x2cf0 kernel/locking/lockdep.c:5191
lock_acquire+0x106/0x330 kernel/locking/lockdep.c:5868
lock_sock_nested+0x48/0x100 net/core/sock.c:3780
lock_sock include/net/sock.h:1709 [inline]
inet6_getname+0x15d/0x650 net/ipv6/af_inet6.c:533
rds_tcp_get_peer_sport net/rds/tcp_listen.c:70 [inline]
rds_tcp_conn_slots_available+0x288/0x470 net/rds/tcp_listen.c:149
rds_recv_hs_exthdrs+0x60f/0x7c0 net/rds/recv.c:265
rds_recv_incoming+0x9f6/0x12d0 net/rds/recv.c:389
rds_tcp_data_recv+0x7f1/0xa40 net/rds/tcp_recv.c:243
__tcp_read_sock+0x196/0x970 net/ipv4/tcp.c:1702
rds_tcp_read_sock net/rds/tcp_recv.c:277 [inline]
rds_tcp_data_ready+0x369/0x950 net/rds/tcp_recv.c:331
tcp_data_queue+0x1e2e/0x5e50 net/ipv4/tcp_input.c:5719
tcp_rcv_established+0x1270/0x2670 net/ipv4/tcp_input.c:6710
tcp_v6_do_rcv+0x8eb/0x1ba0 net/ipv6/tcp_ipv6.c:1609
tcp_v6_rcv+0x2653/0x2f60 net/ipv6/tcp_ipv6.c:1879
ip6_protocol_deliver_rcu+0xa73/0x1600 net/ipv6/ip6_input.c:438
ip6_input_finish+0x191/0x370 net/ipv6/ip6_input.c:489
NF_HOOK+0x336/0x3c0 include/linux/netfilter.h:318
ip6_input+0x16a/0x270 net/ipv6/ip6_input.c:500
ip_sabotage_in+0x1e1/0x270 net/bridge/br_netfilter_hooks.c:990
nf_hook_entry_hookfn include/linux/netfilter.h:158 [inline]
nf_hook_slow+0xc5/0x220 net/netfilter/core.c:623
nf_hook include/linux/netfilter.h:273 [inline]
NF_HOOK+0x21f/0x3c0 include/linux/netfilter.h:316
__netif_receive_skb_one_core net/core/dev.c:6149 [inline]
__netif_receive_skb net/core/dev.c:6262 [inline]
netif_receive_skb_internal net/core/dev.c:6348 [inline]
netif_receive_skb+0x278/0xbb0 net/core/dev.c:6407
NF_HOOK+0xa4/0x3a0 include/linux/netfilter.h:319
br_handle_frame_finish+0x14b2/0x1b40 net/bridge/br_input.c:-1
br_nf_hook_thresh+0x3dd/0x4c0 net/bridge/br_netfilter_hooks.c:-1
br_nf_pre_routing_finish_ipv6+0xa3a/0xd70 net/bridge/br_netfilter_ipv6.c:-1
NF_HOOK include/linux/netfilter.h:318 [inline]
br_nf_pre_routing_ipv6+0x374/0x6f0 net/bridge/br_netfilter_ipv6.c:184
nf_hook_entry_hookfn include/linux/netfilter.h:158 [inline]
nf_hook_bridge_pre net/bridge/br_input.c:291 [inline]
br_handle_frame+0x1277/0x1510 net/bridge/br_input.c:442
__netif_receive_skb_core+0x98f/0x3150 net/core/dev.c:6036
__netif_receive_skb_one_core net/core/dev.c:6147 [inline]
__netif_receive_skb net/core/dev.c:6262 [inline]
process_backlog+0x76d/0x1950 net/core/dev.c:6614
__napi_poll+0xae/0x340 net/core/dev.c:7678
napi_poll net/core/dev.c:7741 [inline]
net_rx_action+0x627/0xf70 net/core/dev.c:7893
handle_softirqs+0x22a/0x7c0 kernel/softirq.c:622
do_softirq+0x76/0xd0 kernel/softirq.c:523
</IRQ>
<TASK>
__local_bh_enable_ip+0xf8/0x130 kernel/softirq.c:450
local_bh_enable include/linux/bottom_half.h:33 [inline]
rcu_read_unlock_bh include/linux/rcupdate.h:936 [inline]
__dev_queue_xmit+0x1e6c/0x3850 net/core/dev.c:4856
NF_HOOK_COND include/linux/netfilter.h:307 [inline]
ip6_output+0x340/0x550 net/ipv6/ip6_output.c:246
NF_HOOK include/linux/netfilter.h:318 [inline]
ip6_xmit+0x1149/0x1980 net/ipv6/ip6_output.c:358
inet6_csk_xmit+0x4a5/0x750 net/ipv6/inet6_connection_sock.c:114
__tcp_transmit_skb+0x249b/0x43e0 net/ipv4/tcp_output.c:1693
tcp_transmit_skb net/ipv4/tcp_output.c:1711 [inline]
tcp_write_xmit+0x16e8/0x6980 net/ipv4/tcp_output.c:3064
__tcp_push_pending_frames+0x97/0x380 net/ipv4/tcp_output.c:3247
tcp_push_pending_frames include/net/tcp.h:2282 [inline]
__tcp_sock_set_cork net/ipv4/tcp.c:3688 [inline]
tcp_sock_set_cork+0x186/0x2e0 net/ipv4/tcp.c:3695
rds_send_xmit+0x207e/0x28d0 net/rds/send.c:480
rds_send_worker+0x7d/0x2e0 net/rds/threads.c:200
process_one_work kernel/workqueue.c:3257 [inline]
process_scheduled_works+0xaec/0x17a0 kernel/workqueue.c:3340
worker_thread+0xda6/0x1360 kernel/workqueue.c:3421
kthread+0x726/0x8b0 kernel/kthread.c:463
ret_from_fork+0x51b/0xa40 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
</TASK>
BUG: sleeping function called from invalid context at net/core/sock.c:3782
in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 1106, name: kworker/u8:5
preempt_count: 303, expected: 0
RCU nest depth: 7, expected: 0
INFO: lockdep is turned off.
Preemption disabled at:
[<ffffffff89678fa1>] local_bh_disable include/linux/bottom_half.h:20 [inline]
[<ffffffff89678fa1>] rcu_read_lock_bh include/linux/rcupdate.h:918 [inline]
[<ffffffff89678fa1>] __dev_queue_xmit+0x281/0x3850 net/core/dev.c:4754
CPU: 1 UID: 0 PID: 1106 Comm: kworker/u8:5 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026
Workqueue: krds_cp_wq#1/0 rds_send_worker
Call Trace:
<IRQ>
dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
__might_resched+0x378/0x4d0 kernel/sched/core.c:8829
lock_sock_nested+0x5d/0x100 net/core/sock.c:3782
lock_sock include/net/sock.h:1709 [inline]
inet6_getname+0x15d/0x650 net/ipv6/af_inet6.c:533
rds_tcp_get_peer_sport net/rds/tcp_listen.c:70 [inline]
rds_tcp_conn_slots_available+0x288/0x470 net/rds/tcp_listen.c:149
rds_recv_hs_exthdrs+0x60f/0x7c0 net/rds/recv.c:265
rds_recv_incoming+0x9f6/0x12d0 net/rds/recv.c:389
rds_tcp_data_recv+0x7f1/0xa40 net/rds/tcp_recv.c:243
__tcp_read_sock+0x196/0x970 net/ipv4/tcp.c:1702
rds_tcp_read_sock net/rds/tcp_recv.c:277 [inline]
rds_tcp_data_ready+0x369/0x950 net/rds/tcp_recv.c:331
tcp_data_queue+0x1e2e/0x5e50 net/ipv4/tcp_input.c:5719
tcp_rcv_established+0x1270/0x2670 net/ipv4/tcp_input.c:6710
tcp_v6_do_rcv+0x8eb/0x1ba0 net/ipv6/tcp_ipv6.c:1609
tcp_v6_rcv+0x2653/0x2f60 net/ipv6/tcp_ipv6.c:1879
ip6_protocol_deliver_rcu+0xa73/0x1600 net/ipv6/ip6_input.c:438
ip6_input_finish+0x191/0x370 net/ipv6/ip6_input.c:489
NF_HOOK+0x336/0x3c0 include/linux/netfilter.h:318
ip6_input+0x16a/0x270 net/ipv6/ip6_input.c:500
ip_sabotage_in+0x1e1/0x270 net/bridge/br_netfilter_hooks.c:990
nf_hook_entry_hookfn include/linux/netfilter.h:158 [inline]
nf_hook_slow+0xc5/0x220 net/netfilter/core.c:623
nf_hook include/linux/netfilter.h:273 [inline]
NF_HOOK+0x21f/0x3c0 include/linux/netfilter.h:316
__netif_receive_skb_one_core net/core/dev.c:6149 [inline]
__netif_receive_skb net/core/dev.c:6262 [inline]
netif_receive_skb_internal net/core/dev.c:6348 [inline]
netif_receive_skb+0x278/0xbb0 net/core/dev.c:6407
NF_HOOK+0xa4/0x3a0 include/linux/netfilter.h:319
br_handle_frame_finish+0x14b2/0x1b40 net/bridge/br_input.c:-1
br_nf_hook_thresh+0x3dd/0x4c0 net/bridge/br_netfilter_hooks.c:-1
br_nf_pre_routing_finish_ipv6+0xa3a/0xd70 net/bridge/br_netfilter_ipv6.c:-1
NF_HOOK include/linux/netfilter.h:318 [inline]
br_nf_pre_routing_ipv6+0x374/0x6f0 net/bridge/br_netfilter_ipv6.c:184
nf_hook_entry_hookfn include/linux/netfilter.h:158 [inline]
nf_hook_bridge_pre net/bridge/br_input.c:291 [inline]
br_handle_frame+0x1277/0x1510 net/bridge/br_input.c:442
__netif_receive_skb_core+0x98f/0x3150 net/core/dev.c:6036
__netif_receive_skb_one_core net/core/dev.c:6147 [inline]
__netif_receive_skb net/core/dev.c:6262 [inline]
process_backlog+0x76d/0x1950 net/core/dev.c:6614
__napi_poll+0xae/0x340 net/core/dev.c:7678
napi_poll net/core/dev.c:7741 [inline]
net_rx_action+0x627/0xf70 net/core/dev.c:7893
handle_softirqs+0x22a/0x7c0 kernel/softirq.c:622
do_softirq+0x76/0xd0 kernel/softirq.c:523
</IRQ>
<TASK>
__local_bh_enable_ip+0xf8/0x130 kernel/softirq.c:450
local_bh_enable include/linux/bottom_half.h:33 [inline]
rcu_read_unlock_bh include/linux/rcupdate.h:936 [inline]
__dev_queue_xmit+0x1e6c/0x3850 net/core/dev.c:4856
NF_HOOK_COND include/linux/netfilter.h:307 [inline]
ip6_output+0x340/0x550 net/ipv6/ip6_output.c:246
NF_HOOK include/linux/netfilter.h:318 [inline]
ip6_xmit+0x1149/0x1980 net/ipv6/ip6_output.c:358
inet6_csk_xmit+0x4a5/0x750 net/ipv6/inet6_connection_sock.c:114
__tcp_transmit_skb+0x249b/0x43e0 net/ipv4/tcp_output.c:1693
tcp_transmit_skb net/ipv4/tcp_output.c:1711 [inline]
tcp_write_xmit+0x16e8/0x6980 net/ipv4/tcp_output.c:3064
__tcp_push_pending_frames+0x97/0x380 net/ipv4/tcp_output.c:3247
tcp_push_pending_frames include/net/tcp.h:2282 [inline]
__tcp_sock_set_cork net/ipv4/tcp.c:3688 [inline]
tcp_sock_set_cork+0x186/0x2e0 net/ipv4/tcp.c:3695
rds_send_xmit+0x207e/0x28d0 net/rds/send.c:480
rds_send_worker+0x7d/0x2e0 net/rds/threads.c:200
process_one_work kernel/workqueue.c:3257 [inline]
process_scheduled_works+0xaec/0x17a0 kernel/workqueue.c:3340
worker_thread+0xda6/0x1360 kernel/workqueue.c:3421
kthread+0x726/0x8b0 kernel/kthread.c:463
ret_from_fork+0x51b/0xa40 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
</TASK>
Tested on:
commit: 57be33f8 nfc: nxp-nci: remove interrupt trigger type
git tree: git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next.git main
console output: https://syzkaller.appspot.com/x/log.txt?x=16b8c65a580000
kernel config: https://syzkaller.appspot.com/x/.config?x=7eb827dd875ec07f
dashboard link: https://syzkaller.appspot.com/bug?extid=96046021045ffe6d7709
compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8
patch: https://syzkaller.appspot.com/x/patch.diff?x=10f594aa580000
next parent reply other threads:[~2026-02-10 4:06 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <3a571094912e42265974a30b4e1185511a4b81fb.camel@oracle.com>
2026-02-10 4:06 ` syzbot [this message]
[not found] <ad80999d02b961d11160b3b6b41529f7b3bb24ca.camel@oracle.com>
2026-02-10 8:10 ` [syzbot] [rds?] general protection fault in rds_tcp_accept_one syzbot
[not found] <e40e70e09587fa53aa2c098739a5304d02b3ddb6.camel@oracle.com>
2026-02-10 7:07 ` syzbot
[not found] <5b60755d25c9c27c3bb6f76f051cf2b0b4322e46.camel@oracle.com>
2026-02-10 2:02 ` syzbot
2026-02-09 15:41 syzbot
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