* Re: [syzbot] [bpf?] [sctp?] [tipc?] INFO: rcu detected stall in sock_close (5)
[not found] <20260723060717.22001-1-xuanqiang.luo@linux.dev>
@ 2026-07-23 7:20 ` syzbot
0 siblings, 0 replies; 4+ messages in thread
From: syzbot @ 2026-07-23 7:20 UTC (permalink / raw)
To: linux-kernel, syzkaller-bugs, xuanqiang.luo
Hello,
syzbot has tested the proposed patch but the reproducer is still triggering an issue:
lost connection to test machine
Tested on:
commit: 248951dd Merge tag 'hwmon-for-v7.2-rc5' of git://git.k..
git tree: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
console output: https://syzkaller.appspot.com/x/log.txt?x=114d609e580000
kernel config: https://syzkaller.appspot.com/x/.config?x=98da55a882774dfe
dashboard link: https://syzkaller.appspot.com/bug?extid=9a29e1dba699b6f46a03
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
patch: https://syzkaller.appspot.com/x/patch.diff?x=13c54232580000
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [syzbot] [bpf?] [sctp?] [tipc?] INFO: rcu detected stall in sock_close (5)
2026-07-23 2:31 ` Hillf Danton
@ 2026-07-23 3:25 ` syzbot
0 siblings, 0 replies; 4+ messages in thread
From: syzbot @ 2026-07-23 3:25 UTC (permalink / raw)
To: hdanton, linux-kernel, syzkaller-bugs
Hello,
syzbot has tested the proposed patch but the reproducer is still triggering an issue:
lost connection to test machine
Tested on:
commit: 4539944e Merge tag 'liveupdate-fixes-2026-07-22' of gi..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=10b0eab9580000
kernel config: https://syzkaller.appspot.com/x/.config?x=98da55a882774dfe
dashboard link: https://syzkaller.appspot.com/bug?extid=9a29e1dba699b6f46a03
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
patch: https://syzkaller.appspot.com/x/patch.diff?x=154e5746580000
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [syzbot] [bpf?] [sctp?] [tipc?] INFO: rcu detected stall in sock_close (5)
2026-07-22 15:42 ` [syzbot] [bpf?] [sctp?] [tipc?] " syzbot
@ 2026-07-23 2:31 ` Hillf Danton
2026-07-23 3:25 ` syzbot
0 siblings, 1 reply; 4+ messages in thread
From: Hillf Danton @ 2026-07-23 2:31 UTC (permalink / raw)
To: syzbot; +Cc: linux-kernel, syzkaller-bugs
> Date: Wed, 22 Jul 2026 08:42:25 -0700
> syzbot has found a reproducer for the following issue on:
>
> HEAD commit: 248951ddc14d Merge tag 'hwmon-for-v7.2-rc5' of git://git.k..
> git tree: upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=15080ab9580000
> kernel config: https://syzkaller.appspot.com/x/.config?x=98da55a882774dfe
> dashboard link: https://syzkaller.appspot.com/bug?extid=9a29e1dba699b6f46a03
> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=165d9746580000
> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=15ba2ab9580000
#syz test
--- x/net/tipc/socket.c
+++ y/net/tipc/socket.c
@@ -2489,7 +2489,10 @@ void tipc_sk_rcv(struct net *net, struct
struct tipc_sock *tsk;
struct sock *sk;
struct sk_buff *skb;
+ static int nogo = 0;
+ if (nogo)
+ return;
__skb_queue_head_init(&xmitq);
while (skb_queue_len(inputq)) {
dport = tipc_skb_peek_port(inputq, dport);
@@ -2498,7 +2501,9 @@ void tipc_sk_rcv(struct net *net, struct
if (likely(tsk)) {
sk = &tsk->sk;
if (likely(spin_trylock_bh(&sk->sk_lock.slock))) {
+ nogo = 1;
tipc_sk_enqueue(inputq, sk, dport, &xmitq);
+ nogo = 0;
spin_unlock_bh(&sk->sk_lock.slock);
}
/* Send pending response/rejected messages, if any */
--
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [syzbot] [bpf?] [sctp?] [tipc?] INFO: rcu detected stall in sock_close (5)
2025-07-16 17:01 [syzbot] [wireless?] " syzbot
@ 2026-07-22 15:42 ` syzbot
2026-07-23 2:31 ` Hillf Danton
0 siblings, 1 reply; 4+ messages in thread
From: syzbot @ 2026-07-22 15:42 UTC (permalink / raw)
To: andrii, ast, bpf, daniel, davem, edumazet, horms, jmaloy, kuba,
linux-kernel, linux-sctp, linux-wireless, lucien.xin,
marcelo.leitner, netdev, pabeni, syzkaller-bugs, tipc-discussion
syzbot has found a reproducer for the following issue on:
HEAD commit: 248951ddc14d Merge tag 'hwmon-for-v7.2-rc5' of git://git.k..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=15080ab9580000
kernel config: https://syzkaller.appspot.com/x/.config?x=98da55a882774dfe
dashboard link: https://syzkaller.appspot.com/bug?extid=9a29e1dba699b6f46a03
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=165d9746580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=15ba2ab9580000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/cbba9d9c5929/disk-248951dd.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/84360c1cd7aa/vmlinux-248951dd.xz
kernel image: https://storage.googleapis.com/syzbot-assets/c128dc7a62e1/bzImage-248951dd.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+9a29e1dba699b6f46a03@syzkaller.appspotmail.com
rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P5985
rcu: (detected by 0, t=10502 jiffies, g=18453, q=4003 ncpus=2)
task:syz.0.20 state:R running task stack:22176 pid:5985 tgid:5984 ppid:5819 task_flags:0x400040 flags:0x00080002
Call Trace:
<IRQ>
sched_show_task+0x4aa/0x5f0 kernel/sched/core.c:8184
rcu_print_detail_task_stall_rnp kernel/rcu/tree_stall.h:292 [inline]
print_other_cpu_stall+0xf7b/0x1310 kernel/rcu/tree_stall.h:680
check_cpu_stall kernel/rcu/tree_stall.h:855 [inline]
rcu_pending kernel/rcu/tree.c:3708 [inline]
rcu_sched_clock_irq+0x93d/0x1050 kernel/rcu/tree.c:2744
update_process_times+0x234/0x2d0 kernel/time/timer.c:2475
tick_sched_handle kernel/time/tick-sched.c:296 [inline]
tick_nohz_handler+0x38f/0x6b0 kernel/time/tick-sched.c:317
__run_hrtimer kernel/time/hrtimer.c:2032 [inline]
__hrtimer_run_queues+0x3a0/0xaf0 kernel/time/hrtimer.c:2096
hrtimer_interrupt+0x44a/0x900 kernel/time/hrtimer.c:2215
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1051 [inline]
__sysvec_apic_timer_interrupt+0x102/0x430 arch/x86/kernel/apic/apic.c:1068
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline]
sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1062
</IRQ>
<TASK>
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:__local_bh_enable_ip+0x1c2/0x2b0 kernel/softirq.c:307
Code: f7 89 df e8 60 01 00 00 41 f7 c4 00 02 00 00 74 05 e8 c2 9e 45 00 9c 58 a9 00 02 00 00 75 23 41 f7 c4 00 02 00 00 74 01 fb 5b <41> 5c 41 5d 41 5e 41 5f 5d e9 00 97 be 09 cc 90 0f 0b 90 e9 66 fe
RSP: 0018:ffffc900040ee0f0 EFLAGS: 00000206
RAX: 0000000000000006 RBX: dffffc0000000000 RCX: 0000000000000046
RDX: 0000000000000002 RSI: ffffffff8d883356 RDI: ffffffff8bca6680
RBP: 1ffff11005252d1e R08: ffffffff8faf8df7 R09: 1ffffffff1f5f1be
R10: dffffc0000000000 R11: fffffbfff1f5f1bf R12: 0000000000000282
R13: dffffc0000000000 R14: ffff8880292968f4 R15: 0000000000000001
local_bh_enable include/linux/bottom_half.h:33 [inline]
spin_unlock_bh include/linux/spinlock_rt.h:116 [inline]
tipc_skb_peek_port net/tipc/msg.h:1235 [inline]
tipc_sk_rcv+0x44d/0x2b30 net/tipc/socket.c:2495
tipc_node_xmit+0x218/0xf10 net/tipc/node.c:1701
tipc_node_xmit_skb+0x139/0x1b0 net/tipc/node.c:1766
tipc_sk_rcv+0x2926/0x2b30 net/tipc/socket.c:2526
tipc_node_xmit+0x218/0xf10 net/tipc/node.c:1701
tipc_sk_push_backlog net/tipc/socket.c:1313 [inline]
tipc_sk_filter_connect net/tipc/socket.c:2259 [inline]
tipc_sk_filter_rcv+0x1811/0x3240 net/tipc/socket.c:2368
tipc_sk_enqueue net/tipc/socket.c:2449 [inline]
tipc_sk_rcv+0x8c4/0x2b30 net/tipc/socket.c:2501
tipc_node_xmit+0x218/0xf10 net/tipc/node.c:1701
tipc_node_xmit_skb net/tipc/node.c:1766 [inline]
tipc_node_distr_xmit+0x2da/0x420 net/tipc/node.c:1781
tipc_sk_backlog_rcv+0x1b6/0x280 net/tipc/socket.c:2416
sk_backlog_rcv include/net/sock.h:1190 [inline]
__release_sock+0x2b2/0x3d0 net/core/sock.c:3261
release_sock+0x1be/0x290 net/core/sock.c:3860
tipc_release+0x1abe/0x2500 net/tipc/socket.c:651
__sock_release net/socket.c:710 [inline]
sock_close+0xad/0x220 net/socket.c:1501
__fput+0x42a/0xa80 fs/file_table.c:512
task_work_run+0x1d9/0x270 kernel/task_work.c:233
resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
__exit_to_user_mode_loop kernel/entry/common.c:70 [inline]
exit_to_user_mode_loop+0x1fa/0x730 kernel/entry/common.c:101
__exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:318 [inline]
do_syscall_64+0x353/0x580 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f7460e5de99
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 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 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f74604be028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: 00000000000203a0 RBX: 00007f74610e5fa0 RCX: 00007f7460e5de99
RDX: 0000000000000000 RSI: 00002000000003c0 RDI: 0000000000000003
RBP: 00007f7460ef3eaf R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f74610e6038 R14: 00007f74610e5fa0 R15: 00007ffc753a57c8
</TASK>
---
If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2026-07-23 7:20 UTC | newest]
Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
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[not found] <20260723060717.22001-1-xuanqiang.luo@linux.dev>
2026-07-23 7:20 ` [syzbot] [bpf?] [sctp?] [tipc?] INFO: rcu detected stall in sock_close (5) syzbot
2025-07-16 17:01 [syzbot] [wireless?] " syzbot
2026-07-22 15:42 ` [syzbot] [bpf?] [sctp?] [tipc?] " syzbot
2026-07-23 2:31 ` Hillf Danton
2026-07-23 3:25 ` syzbot
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