Subject: [syzbot] [net?] INFO: rcu detected stall in sys_socket (10)

From: syzbot <[email-masked]>
Date: Thu, 30 Nov 2023 07:24:29 -0800

Hello,

syzbot found the following issue on:

HEAD commit:    18d46e76d7c2 Merge tag 'for-6.7-rc3-tag' of git://git.kern..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=16bcc8b4e80000
kernel config:  https://syzkaller.appspot.com/x/.config?x=bb39fe85d254f638
dashboard link: https://syzkaller.appspot.com/bug?extid=de8e83db70e8beedd556
compiler:       gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=12172952e80000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1086b58ae80000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/0ce5608c89e8/disk-18d46e76.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/eef847faba9c/vmlinux-18d46e76.xz
kernel image: https://storage.googleapis.com/syzbot-assets/6a3df3288860/bzImage-18d46e76.xz

The issue was bisected to:

commit 5a781ccbd19e4664babcbe4b4ead7aa2b9283d22
Author: Vinicius Costa Gomes <[email-masked]>
Date:   Sat Sep 29 00:59:43 2018 +0000

    tc: Add support for configuring the taprio scheduler

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=16a29b52e80000
final oops:     https://syzkaller.appspot.com/x/report.txt?x=15a29b52e80000
console output: https://syzkaller.appspot.com/x/log.txt?x=11a29b52e80000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: [email-masked]
Fixes: 5a781ccbd19e ("tc: Add support for configuring the taprio scheduler")

rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (1 GPs behind) idle=79f4/1/0x4000000000000000 softirq=5546/5548 fqs=1
rcu: 	(detected by 1, t=10503 jiffies, g=5017, q=384 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 5106 Comm: syz-executor201 Not tainted 6.7.0-rc3-syzkaller-00024-g18d46e76d7c2 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023
RIP: 0010:__run_hrtimer kernel/time/hrtimer.c:1686 [inline]
RIP: 0010:__hrtimer_run_queues+0x62e/0xc20 kernel/time/hrtimer.c:1752
Code: fc ff df 48 89 fa 48 c1 ea 03 0f b6 04 02 48 89 fa 83 e2 07 38 d0 7f 08 84 c0 0f 85 fb 04 00 00 45 0f b6 6e 3b 31 ff 44 89 ee <e8> 2d 46 11 00 45 84 ed 0f 84 8e fb ff ff e8 ef 4a 11 00 4c 89 f7
RSP: 0018:ffffc90000007e40 EFLAGS: 00000046
RAX: 0000000000000000 RBX: ffff8880b982ba40 RCX: ffffffff817642f9
RDX: 0000000000000003 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000002 R12: ffff8880b982b940
R13: 0000000000000000 R14: ffff88801c43a340 R15: ffffffff88a2daf0
FS:  00005555566fe380(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe9404c73b0 CR3: 0000000076e2d000 CR4: 0000000000350ef0
Call Trace:
 <NMI>
 </NMI>
 <IRQ>
 hrtimer_interrupt+0x31b/0x800 kernel/time/hrtimer.c:1814
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1065 [inline]
 __sysvec_apic_timer_interrupt+0x105/0x400 arch/x86/kernel/apic/apic.c:1082
 sysvec_apic_timer_interrupt+0x90/0xb0 arch/x86/kernel/apic/apic.c:1076
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:645
RIP: 0010:lock_acquire+0x1ef/0x520 kernel/locking/lockdep.c:5722
Code: c1 05 bd 6c 9a 7e 83 f8 01 0f 85 b4 02 00 00 9c 58 f6 c4 02 0f 85 9f 02 00 00 48 85 ed 74 01 fb 48 b8 00 00 00 00 00 fc ff df <48> 01 c3 48 c7 03 00 00 00 00 48 c7 43 08 00 00 00 00 48 8b 84 24
RSP: 0018:ffffc9000432fb00 EFLAGS: 00000206
RAX: dffffc0000000000 RBX: 1ffff92000865f62 RCX: ffffffff81672c0e
RDX: 0000000000000001 RSI: ffffffff8accbae0 RDI: ffffffff8b2f0dc0
RBP: 0000000000000200 R08: 0000000000000000 R09: fffffbfff23e33d0
R10: ffffffff91f19e87 R11: 0000000000000000 R12: 0000000000000001
R13: 0000000000000000 R14: ffffffff8d0f0b48 R15: 0000000000000000
 __mutex_lock_common kernel/locking/mutex.c:603 [inline]
 __mutex_lock+0x175/0x9d0 kernel/locking/mutex.c:747
 pcpu_alloc+0xbb8/0x1420 mm/percpu.c:1769
 packet_alloc_pending net/packet/af_packet.c:1232 [inline]
 packet_create+0x2b7/0x8e0 net/packet/af_packet.c:3373
 __sock_create+0x328/0x800 net/socket.c:1569
 sock_create net/socket.c:1620 [inline]
 __sys_socket_create net/socket.c:1657 [inline]
 __sys_socket+0x14c/0x260 net/socket.c:1704
 __do_sys_socket net/socket.c:1718 [inline]
 __se_sys_socket net/socket.c:1716 [inline]
 __x64_sys_socket+0x72/0xb0 net/socket.c:1716
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x40/0x110 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7fe940479de9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 d1 19 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffe1bf080b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000029
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fe940479de9
RDX: 0000000000000000 RSI: 0000000800000003 RDI: 0000000000000011
RBP: 00000000000f4240 R08: 0000000000000000 R09: 0000000100000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffe1bf08110
R13: 0000000000030c67 R14: 00007ffe1bf080dc R15: 0000000000000003
 </TASK>
INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.067 msecs
rcu: rcu_preempt kthread timer wakeup didn't happen for 10497 jiffies! g5017 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=0 timer-softirq=2416
rcu: rcu_preempt kthread starved for 10498 jiffies! g5017 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=0
rcu: 	Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.
rcu: RCU grace-period kthread stack dump:
task:rcu_preempt     state:I stack:27904 pid:17    tgid:17    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5376 [inline]
 __schedule+0xedb/0x5af0 kernel/sched/core.c:6688
 __schedule_loop kernel/sched/core.c:6763 [inline]
 schedule+0xe9/0x270 kernel/sched/core.c:6778
 schedule_timeout+0x137/0x290 kernel/time/timer.c:2167
 rcu_gp_fqs_loop+0x1ec/0xb10 kernel/rcu/tree.c:1631
 rcu_gp_kthread+0x24b/0x380 kernel/rcu/tree.c:1830
 kthread+0x2c6/0x3a0 kernel/kthread.c:388
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242
 </TASK>

---
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