rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 1-.... } 2674 jiffies s: 6869 root: 0x2/.
rcu: blocking rcu_node structures (internal RCU debug):
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 8805 Comm: syz-executor.1 Not tainted 6.5.0-rc2-next-20230718-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/03/2023
RIP: 0010:pie_calculate_probability+0x59c/0x850 net/sched/sch_pie.c:369
Code: 31 e4 4c 89 ff 48 be 3c 0a d7 a3 70 3d 0a 00 4c 01 fe 41 0f 92 c4 48 89 73 20 e8 4f 11 2c f9 4d 85 e4 0f 84 29 fe ff ff eb 62 <e8> 2f 16 2c f9 4c 89 ee bf ca 9a 3b 00 e8 b2 11 2c f9 49 81 fd ca
RSP: 0018:ffffc900001e0bc0 EFLAGS: 00000292
RAX: 0000000000000000 RBX: ffffc90019ea9130 RCX: ffffffff885ab45b
RDX: ffff88801fe79dc0 RSI: 0000000000000100 RDI: 0000000000000007
RBP: ffff888045949300 R08: 0000000000000007 R09: 00051eb851eb851e
R10: fffffff0a3da8872 R11: 00000000d01af184 R12: fffffff0a3da8872
R13: 0000000000000000 R14: 00051eb851eb851e R15: 0000000000000000
FS:  00007f9ce2ef16c0(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2f82a000 CR3: 000000005820b000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <IRQ>
 fq_pie_timer+0x1da/0x4f0 net/sched/sch_fq_pie.c:387
 call_timer_fn+0x1a0/0x580 kernel/time/timer.c:1700
 expire_timers kernel/time/timer.c:1751 [inline]
 __run_timers+0x764/0xb10 kernel/time/timer.c:2022
 run_timer_softirq+0x58/0xd0 kernel/time/timer.c:2035
 __do_softirq+0x218/0x965 kernel/softirq.c:553
 invoke_softirq kernel/softirq.c:427 [inline]
 __irq_exit_rcu kernel/softirq.c:632 [inline]
 irq_exit_rcu+0xb7/0x120 kernel/softirq.c:644
 sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1109
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:645
RIP: 0010:__seqprop_spinlock_sequence include/linux/seqlock.h:275 [inline]
RIP: 0010:read_seqbegin include/linux/seqlock.h:837 [inline]
RIP: 0010:is_subdir fs/dcache.c:3213 [inline]
RIP: 0010:is_subdir+0xa6/0x370 fs/dcache.c:3203
Code: 24 38 48 c7 c7 88 46 61 8c e8 86 cf 76 ff 9c 5b 81 e3 00 02 00 00 31 ff 48 89 de e8 44 db 95 ff 48 85 db 58 0f 85 9e 02 00 00 <e8> a5 df 95 ff eb 07 e8 9e df 95 ff f3 90 8b 2d e6 58 70 0a 31 ff
RSP: 0018:ffffc900159f7c18 EFLAGS: 00000287
RAX: 00000000000019cf RBX: 0000000000000000 RCX: ffffc90003b71000
RDX: 0000000000040000 RSI: ffffffff81f0ef8d RDI: 0000000000000007
RBP: dffffc0000000000 R08: 0000000000000007 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff888044a48bc0
R13: dffffc0000000000 R14: ffff888077102eb0 R15: ffffed1003d04f52
 propagate_one fs/pnode.c:232 [inline]
 propagate_mnt+0x167/0x530 fs/pnode.c:306
 attach_recursive_mnt+0x377/0x11c0 fs/namespace.c:2337
 graft_tree+0x189/0x210 fs/namespace.c:2520
 do_loopback fs/namespace.c:2635 [inline]
 path_mount+0x1872/0x1ed0 fs/namespace.c:3656
 do_mount fs/namespace.c:3675 [inline]
 __do_sys_mount fs/namespace.c:3884 [inline]
 __se_sys_mount fs/namespace.c:3861 [inline]
 __x64_sys_mount+0x293/0x310 fs/namespace.c:3861
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f9ce227cb29
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f9ce2ef10c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f9ce239bf80 RCX: 00007f9ce227cb29
RDX: 0000000000000000 RSI: 0000000020000080 RDI: 0000000020000240
RBP: 00007f9ce22c847a R08: 0000000000000000 R09: 0000000000000000
R10: 000000000088700a R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f9ce239bf80 R15: 00007ffe279e4528
 </TASK>