rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 1-.... } 2690 jiffies s: 641041 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: 29396 Comm: syz.4.8414 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:sched_clock_cpu+0x3e/0x260 kernel/sched/clock.c:364
Code: 80 00 00 00 65 48 8b 04 25 28 00 00 00 48 89 44 24 60 49 bd 00 00 00 00 00 fc ff df 48 8d 5c 24 40 48 c7 44 24 20 b3 8a b5 41 <48> c7 44 24 28 d6 c0 51 8c 48 c7 44 24 30 40 e7 60 81 4c 8d 64 24
RSP: 0018:ffffc900001e0c60 EFLAGS: 00000086
RAX: 343f161d7934f400 RBX: ffffc900001e0ca0 RCX: 343f161d7934f400
RDX: 0000000000000000 RSI: ffffffff8adf5dc0 RDI: 0000000000000001
RBP: ffffc900001e0d18 R08: ffffffff8e210aef R09: 1ffffffff1c4215d
R10: dffffc0000000000 R11: fffffbfff1c4215e R12: dffffc0000000000
R13: dffffc0000000000 R14: ffff888075a10000 R15: ffffffff8c65f988
FS:  00007fb08cc476c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000083775000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000200000000300 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 irqtime_account_irq+0x6a/0x1b0 kernel/sched/cputime.c:60
 instr_sysvec_irq_work arch/x86/kernel/irq_work.c:17 [inline]
 sysvec_irq_work+0x45/0xc0 arch/x86/kernel/irq_work.c:17
 asm_sysvec_irq_work+0x16/0x20 arch/x86/include/asm/idtentry.h:728
RIP: 0010:variable_ffs arch/x86/include/asm/bitops.h:319 [inline]
RIP: 0010:handle_softirqs+0x1b7/0x910 kernel/softirq.c:584
Code: 89 7c 24 2c 0f b7 db 48 c7 c7 80 0d 8b 8a e8 60 ee e0 08 65 66 c7 05 d6 62 b4 7e 00 00 e8 81 53 39 00 fb 49 c7 c5 c0 a0 80 8c <89> 5c 24 34 b8 ff ff ff ff 0f bc 44 24 34 41 89 c6 41 ff c6 0f 84
RSP: 0018:ffffc900001e0e20 EFLAGS: 00000282
RAX: 343f161d7934f400 RBX: 0000000000000200 RCX: 343f161d7934f400
RDX: dffffc0000000000 RSI: ffffffff8a8c17a0 RDI: ffffffff8adf5de0
RBP: ffffc900001e0f30 R08: ffff8880b8f3580b R09: 1ffff110171e6b01
R10: dffffc0000000000 R11: ffffed10171e6b02 R12: dffffc0000000000
R13: ffffffff8c80a0c0 R14: ffff888075a10000 R15: 000000000000000a
 __do_softirq kernel/softirq.c:630 [inline]
 invoke_softirq kernel/softirq.c:470 [inline]
 __irq_exit_rcu+0x13b/0x230 kernel/softirq.c:679
 irq_exit_rcu+0x5/0x20 kernel/softirq.c:691
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline]
 sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1118
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:rcu_read_unlock_special+0x0/0x510 kernel/rcu/tree_plugin.h:630
Code: c6 68 66 00 eb b0 44 89 f1 80 e1 07 80 c1 03 38 c1 7c 94 49 89 fd 4c 89 f7 e8 ac 68 66 00 4c 89 ef eb 84 0f 1f 80 00 00 00 00 <55> 48 89 e5 41 57 41 56 41 55 41 54 53 48 83 e4 e0 48 81 ec c0 00
RSP: 0018:ffffc900032c7810 EFLAGS: 00000206
RAX: 0000000000000000 RBX: ffff888075a1043c RCX: 0000000000080000
RDX: ffffc9000e74c000 RSI: 0000000000000b7c RDI: ffff888075a10000
RBP: 0000000000000001 R08: ffff888087dac5b3 R09: 1ffff11010fb58b6
R10: dffffc0000000000 R11: ffffed1010fb58b7 R12: 1ffff1100eb42087
R13: ffff88803f97c028 R14: ffff888075a10440 R15: dffffc0000000000
 __rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:426
 rcu_read_unlock include/linux/rcupdate.h:823 [inline]
 netlink_deliver_tap+0x177/0x1b0 net/netlink/af_netlink.c:340
 netlink_deliver_tap_kernel net/netlink/af_netlink.c:347 [inline]
 netlink_unicast_kernel net/netlink/af_netlink.c:1317 [inline]
 netlink_unicast+0x777/0x920 net/netlink/af_netlink.c:1344
 netlink_sendmsg+0x8ad/0xbd0 net/netlink/af_netlink.c:1877
 sock_sendmsg_nosec net/socket.c:718 [inline]
 __sock_sendmsg net/socket.c:730 [inline]
 ____sys_sendmsg+0x5ed/0x9a0 net/socket.c:2519
 ___sys_sendmsg+0x2a2/0x360 net/socket.c:2573
 __sys_sendmsg net/socket.c:2602 [inline]
 __do_sys_sendmsg net/socket.c:2611 [inline]
 __se_sys_sendmsg+0x1c3/0x2b0 net/socket.c:2609
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fb08bd9e0d9
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:00007fb08cc47028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007fb08c025fa0 RCX: 00007fb08bd9e0d9
RDX: 000000000000c004 RSI: 0000200000000140 RDI: 000000000000000b
RBP: 00007fb08be35024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fb08c026038 R14: 00007fb08c025fa0 R15: 00007ffcb1439df8
 </TASK>