rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 1-.... } 2739 jiffies s: 153661 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 UID: 0 PID: 17424 Comm: syz-executor.2 Not tainted 6.10.0-rc4-next-20240621-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
RIP: 0010:io_serial_out+0x7e/0xc0 drivers/tty/serial/8250/8250_port.c:413
Code: fc 89 e9 41 d3 e7 48 83 c3 40 48 89 d8 48 c1 e8 03 42 80 3c 20 00 74 08 48 89 df e8 7c 78 ba fc 44 03 3b 44 89 f0 44 89 fa ee <5b> 41 5c 41 5e 41 5f 5d c3 cc cc cc cc 89 e9 80 e1 07 38 c1 7c a7
RSP: 0018:ffffc90000a18290 EFLAGS: 00000002
RAX: 000000000000005f RBX: ffffffff94b08b80 RCX: 0000000000000000
RDX: 00000000000003f8 RSI: 0000000000000000 RDI: 0000000000000020
RBP: 0000000000000000 R08: ffffffff853f694b R09: 1ffff11003ea1046
R10: dffffc0000000000 R11: ffffffff853f6900 R12: dffffc0000000000
R13: ffffffff9481cbca R14: 000000000000005f R15: 00000000000003f8
FS:  000055559204d480(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6fe9fb0000 CR3: 000000004f44e000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <IRQ>
 serial8250_console_write+0x14ed/0x1ed0 drivers/tty/serial/8250/8250_port.c:3393
 console_emit_next_record kernel/printk/printk.c:2975 [inline]
 console_flush_all+0x880/0xf50 kernel/printk/printk.c:3047
 console_unlock+0x13b/0x4d0 kernel/printk/printk.c:3118
 vprintk_emit+0x7a1/0x900 kernel/printk/printk.c:2420
 _printk+0xd5/0x120 kernel/printk/printk.c:2447
 printk_stack_address arch/x86/kernel/dumpstack.c:72 [inline]
 show_trace_log_lvl+0x43a/0x520 arch/x86/kernel/dumpstack.c:285
 sched_show_task+0x578/0x740 kernel/sched/core.c:7503
 report_rtnl_holders+0x1ba/0x2d0 net/core/rtnetlink.c:104
 call_timer_fn+0x18e/0x650 kernel/time/timer.c:1792
 expire_timers kernel/time/timer.c:1843 [inline]
 __run_timers kernel/time/timer.c:2417 [inline]
 __run_timer_base+0x66a/0x8e0 kernel/time/timer.c:2428
 run_timer_base kernel/time/timer.c:2437 [inline]
 run_timer_softirq+0xb7/0x170 kernel/time/timer.c:2447
 handle_softirqs+0x2c4/0x970 kernel/softirq.c:554
 __do_softirq kernel/softirq.c:588 [inline]
 invoke_softirq kernel/softirq.c:428 [inline]
 __irq_exit_rcu+0xf4/0x1c0 kernel/softirq.c:637
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:649
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline]
 sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1043
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:check_kcov_mode kernel/kcov.c:175 [inline]
RIP: 0010:write_comp_data kernel/kcov.c:236 [inline]
RIP: 0010:__sanitizer_cov_trace_switch+0xbc/0x120 kernel/kcov.c:341
Code: c2 49 39 d2 74 71 4c 8b 74 d6 10 65 8b 05 14 55 70 7e a9 00 01 ff 00 74 11 a9 00 01 00 00 74 de 41 83 bb 1c 16 00 00 00 74 d4 <41> 8b 83 f8 15 00 00 83 f8 03 75 c8 49 8b 8b 00 16 00 00 45 8b bb
RSP: 0018:ffffc9000cd374f8 EFLAGS: 00000246
RAX: 0000000080000000 RBX: 0000000000000073 RCX: 000000008bcb8d03
RDX: 0000000000000006 RSI: ffffffff8f965e40 RDI: 0000000000000073
RBP: ffffc9000cd37610 R08: 0000000000000001 R09: ffffffff8b86b851
R10: 000000000000000a R11: ffff888020c25a00 R12: 1ffffffff17971bc
R13: ffffffff8bcb8de3 R14: 0000000000000070 R15: ffff000000000600
 format_decode+0x9f1/0x1bb0 lib/vsprintf.c:2634
 vsnprintf+0x14f/0x1da0 lib/vsprintf.c:2776
 sprintf+0xda/0x120 lib/vsprintf.c:3028
 print_caller kernel/printk/printk.c:1362 [inline]
 info_print_prefix+0x204/0x310 kernel/printk/printk.c:1379
 get_record_print_text_size kernel/printk/printk.c:1514 [inline]
 find_first_fitting_seq+0x1b2/0x580 kernel/printk/printk.c:1543
 syslog_print_all+0x1ae/0x7e0 kernel/printk/printk.c:1691
 do_syslog+0x455/0x810 kernel/printk/printk.c:1769
 __do_sys_syslog kernel/printk/printk.c:1847 [inline]
 __se_sys_syslog kernel/printk/printk.c:1845 [inline]
 __x64_sys_syslog+0x7c/0x90 kernel/printk/printk.c:1845
 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: 0033:0x7f6fe9e7d0a9
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:00007ffedeecdf18 EFLAGS: 00000246 ORIG_RAX: 0000000000000067
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f6fe9e7d0a9
RDX: 000000000000003f RSI: 00007ffedeece000 RDI: 0000000000000003
RBP: 00007ffedeece000 R08: 7fffffffffffffff R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffedeece5e8
R13: 00007ffedeeceede R14: 0000000000000001 R15: 0000000000000001
 </TASK>
 netlink_unicast_kernel net/netlink/af_netlink.c:1331 [inline]
 netlink_unicast+0x7f0/0x990 net/netlink/af_netlink.c:1357
 netlink_sendmsg+0x8e4/0xcb0 net/netlink/af_netlink.c:1901
 sock_sendmsg_nosec net/socket.c:730 [inline]
 __sock_sendmsg+0x221/0x270 net/socket.c:745
 ____sys_sendmsg+0x525/0x7d0 net/socket.c:2597
 ___sys_sendmsg net/socket.c:2651 [inline]
 __sys_sendmsg+0x2b0/0x3a0 net/socket.c:2680
 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: 0033:0x7f1feea7d0a9
RSP: 002b:00007f1fef74c0c8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f1feebb4050 RCX: 00007f1feea7d0a9