linux-kernel - [syzbot] [bpf?] [netfilter?] INFO: rcu detected stall in sys

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Message-ID: <674b53e8.050a0220.253251.00e0.GAE@google.com>
Date: Sat, 30 Nov 2024 10:05:28 -0800
From: syzbot <syzbot+53e660acb94e444b9d63@...kaller.appspotmail.com>
To: andrii@...nel.org, anna-maria@...utronix.de, ast@...nel.org, 
	bpf@...r.kernel.org, daniel@...earbox.net, frederic@...nel.org, 
	kadlec@...filter.org, linux-kernel@...r.kernel.org, netdev@...r.kernel.org, 
	netfilter-devel@...r.kernel.org, pablo@...filter.org, 
	syzkaller-bugs@...glegroups.com, tglx@...utronix.de
Subject: [syzbot] [bpf?] [netfilter?] INFO: rcu detected stall in sys_sendmmsg (7)

Hello,

syzbot found the following issue on:

HEAD commit:    b86545e02e8c Merge tag 'acpi-6.13-rc1-2' of git://git.kern..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=12cd4f78580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=f8e5d0648de624aa
dashboard link: https://syzkaller.appspot.com/bug?extid=53e660acb94e444b9d63
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/7afd648f7c25/disk-b86545e0.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/40e3ee6c8cc8/vmlinux-b86545e0.xz
kernel image: https://storage.googleapis.com/syzbot-assets/53bc5977cfb0/bzImage-b86545e0.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+53e660acb94e444b9d63@...kaller.appspotmail.com

rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...0: (6 ticks this GP) idle=545c/1/0x4000000000000000 softirq=161841/161847 fqs=2100
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:        0          0            0
rcu: 	cputime:        0          0            0   ==> 52500(ms)
rcu: 	(detected by 0, t=10505 jiffies, g=202837, q=172 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 1553 Comm: syz.8.7708 Not tainted 6.12.0-syzkaller-10553-gb86545e02e8c #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:advance_sched+0x36/0xca0 net/sched/sch_taprio.c:916
Code: 54 53 48 81 ec 98 00 00 00 49 89 fe 48 bd 00 00 00 00 00 fc ff df e8 79 e7 c8 f7 49 8d 5e 88 48 89 d8 48 c1 e8 03 80 3c 28 00 <74> 08 48 89 df e8 50 a3 30 f8 48 8b 03 48 89 84 24 88 00 00 00 48
RSP: 0018:ffffc90000a18c70 EFLAGS: 00000046
RAX: 1ffff1100c0f9259 RBX: ffff8880607c92c8 RCX: ffff88802d349e00
RDX: 0000000000010000 RSI: 0000000000000000 RDI: ffff8880607c9340
RBP: dffffc0000000000 R08: ffffffff8183463f R09: 1ffffffff203a606
R10: dffffc0000000000 R11: ffffffff89ccfc90 R12: dffffc0000000000
R13: ffffffff89ccfc90 R14: ffff8880607c9340 R15: ffff88802d34a8c8
FS:  00007f7bb35f66c0(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c32f64a CR3: 0000000070470000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <IRQ>
 __run_hrtimer kernel/time/hrtimer.c:1739 [inline]
 __hrtimer_run_queues+0x59b/0xd50 kernel/time/hrtimer.c:1803
 hrtimer_interrupt+0x403/0xa40 kernel/time/hrtimer.c:1865
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1038 [inline]
 __sysvec_apic_timer_interrupt+0x110/0x420 arch/x86/kernel/apic/apic.c:1055
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
 sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1049
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:finish_task_switch+0x1ea/0x870 kernel/sched/core.c:5243
Code: c9 50 e8 79 07 0c 00 48 83 c4 08 4c 89 f7 e8 9d 39 00 00 e9 de 04 00 00 4c 89 f7 e8 70 2f 6f 0a e8 2b 9a 38 00 fb 48 8b 5d c0 <48> 8d bb f8 15 00 00 48 89 f8 48 c1 e8 03 49 be 00 00 00 00 00 fc
RSP: 0018:ffffc900033771a8 EFLAGS: 00000286
RAX: a5530211a14c0a00 RBX: ffff88802d349e00 RCX: ffffffff9a3f7903
RDX: dffffc0000000000 RSI: ffffffff8c0ad980 RDI: ffffffff8c6083a0
RBP: ffffc900033771f0 R08: ffffffff901d3037 R09: 1ffffffff203a606
R10: dffffc0000000000 R11: fffffbfff203a607 R12: 1ffff110170e7eac
R13: dffffc0000000000 R14: ffff8880b863e740 R15: ffff8880b873f560
 context_switch kernel/sched/core.c:5372 [inline]
 __schedule+0x1803/0x4be0 kernel/sched/core.c:6756
 __schedule_loop kernel/sched/core.c:6833 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6848
 schedule_timeout+0xb0/0x290 kernel/time/sleep_timeout.c:75
 unix_wait_for_peer+0x250/0x340 net/unix/af_unix.c:1529
 unix_dgram_sendmsg+0x127f/0x1f80 net/unix/af_unix.c:2131
 sock_sendmsg_nosec net/socket.c:711 [inline]
 __sock_sendmsg+0x221/0x270 net/socket.c:726
 ____sys_sendmsg+0x52a/0x7e0 net/socket.c:2583
 ___sys_sendmsg net/socket.c:2637 [inline]
 __sys_sendmmsg+0x36a/0x720 net/socket.c:2726
 __do_sys_sendmmsg net/socket.c:2753 [inline]
 __se_sys_sendmmsg net/socket.c:2750 [inline]
 __x64_sys_sendmmsg+0xa0/0xb0 net/socket.c:2750
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f7bb5780809
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f7bb35f6058 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 00007f7bb5945fa0 RCX: 00007f7bb5780809
RDX: 0000000000000651 RSI: 0000000020000000 RDI: 0000000000000007
RBP: 00007f7bb57f393e R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f7bb5945fa0 R15: 00007ffe8b8d0818
 </TASK>


---
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