rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: {
 1-....
 } 2652 jiffies s: 16537 root: 0x2/.
rcu: blocking rcu_node structures (internal RCU debug):
Sending NMI from CPU 0 to CPUs 1:
cdc_wdm 1-1:1.0: wdm_int_callback - 0 bytes
NMI backtrace for cpu 1
CPU: 1 PID: 5348 Comm: kworker/1:6 Not tainted 6.7.0-rc5-syzkaller-g1760bfa7d7ca #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
Workqueue: events_power_efficient gc_worker
RIP: 0010:io_serial_out+0x8f/0xb0 drivers/tty/serial/8250/8250_port.c:417
Code: 48 8d 7d 40 44 89 e1 48 b8 00 00 00 00 00 fc ff df 48 89 fa d3 e3 48 c1 ea 03 80 3c 02 00 75 18 66 03 5d 40 44 89 e8 89 da ee <5b> 5d 41 5c 41 5d c3 e8 75 fb 14 ff eb a4 e8 ce fb 14 ff eb e1 66
RSP: 0018:ffffc90000198400 EFLAGS: 00000006
RAX: 0000000000000000 RBX: 00000000000003f9 RCX: 0000000000000000
RDX: 00000000000003f9 RSI: ffffffff828681f5 RDI: ffffffff8c155fa0
RBP: ffffffff8c155f60 R08: 0000000000000001 R09: 000000000000001f
R10: 0000000000000000 R11: 205d343438333154 R12: 0000000000000000
R13: 0000000000000000 R14: ffffffff8c155fb0 R15: 000000000000004f
FS:  0000000000000000(0000) GS:ffff8881f6700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f5188000318 CR3: 000000013efd6000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <IRQ>
 serial_out drivers/tty/serial/8250/8250.h:122 [inline]
 serial8250_clear_IER+0x98/0xb0 drivers/tty/serial/8250/8250_port.c:710
 serial8250_console_write+0x18e/0x1060 drivers/tty/serial/8250/8250_port.c:3409
 console_emit_next_record kernel/printk/printk.c:2901 [inline]
 console_flush_all+0x4d5/0xd50 kernel/printk/printk.c:2967
 console_unlock+0x10c/0x260 kernel/printk/printk.c:3036
 vprintk_emit+0x17f/0x5f0 kernel/printk/printk.c:2303
 dev_vprintk_emit drivers/base/core.c:4850 [inline]
 dev_printk_emit+0xfb/0x140 drivers/base/core.c:4861
 __dev_printk+0xf5/0x270 drivers/base/core.c:4873
 _dev_err+0xe5/0x120 drivers/base/core.c:4916
 wdm_int_callback+0x7d1/0xaa0 drivers/usb/class/cdc-wdm.c:276
 __usb_hcd_giveback_urb+0x359/0x5c0 drivers/usb/core/hcd.c:1650
 usb_hcd_giveback_urb+0x389/0x430 drivers/usb/core/hcd.c:1733
 dummy_timer+0x1415/0x35f0 drivers/usb/gadget/udc/dummy_hcd.c:1987
 call_timer_fn+0x193/0x580 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+0x20a/0x94b kernel/softirq.c:553
 invoke_softirq kernel/softirq.c:427 [inline]
 __irq_exit_rcu kernel/softirq.c:632 [inline]
 irq_exit_rcu+0xa7/0x110 kernel/softirq.c:644
 sysvec_apic_timer_interrupt+0x8e/0xb0 arch/x86/kernel/apic/apic.c:1076
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:649
RIP: 0010:__seqprop_spinlock_sequence include/linux/seqlock.h:284 [inline]
RIP: 0010:nf_conntrack_get_ht include/net/netfilter/nf_conntrack.h:345 [inline]
RIP: 0010:gc_worker+0x2e1/0x17e0 net/netfilter/nf_conntrack_core.c:1490
Code: 00 00 48 c7 c7 e8 9a 32 89 e8 bb 7a bd fb 9c 5b 81 e3 00 02 00 00 31 ff 48 89 de e8 89 e2 dc fb 48 85 db 58 0f 85 9f 10 00 00 <e8> ea e6 dc fb eb 07 e8 e3 e6 dc fb f3 90 44 8b 35 ca 8e c1 03 31
RSP: 0018:ffffc9000c61fbf0 EFLAGS: 00000293
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff857117cd
RDX: ffff888114dd5700 RSI: ffffffff857117dc RDI: 0000000000000007
RBP: ffff888111000000 R08: 0000000000000007 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 000000000000d0d6
R13: dffffc0000000000 R14: 000000000001a1ab R15: 0000000000040000
 process_one_work+0x884/0x15c0 kernel/workqueue.c:2627
 process_scheduled_works kernel/workqueue.c:2700 [inline]
 worker_thread+0x8b9/0x1290 kernel/workqueue.c:2781
 kthread+0x33c/0x440 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>
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
cdc_wdm 1-1:1.0: nonzero urb status received: -71
usb 6-1: USB disconnect, device number 97
cdc_wdm 1-1:1.0: wdm_int_callback - 0 bytes
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
cdc_wdm 1-1:1.0: nonzero urb status received: -71
cdc_wdm 1-1:1.0: wdm_int_callback - 0 bytes
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
cdc_wdm 1-1:1.0: nonzero urb status received: -71
cdc_wdm 1-1:1.0: wdm_int_callback - 0 bytes
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
cdc_wdm 1-1:1.0: nonzero urb status received: -71
cdc_wdm 1-1:1.0: wdm_int_callback - 0 bytes
cdc_wdm 1-1:1.0: nonzero urb status received: -71
cdc_wdm 1-1:1.0: wdm_int_callback - 0 bytes
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
cdc_wdm 1-1:1.0: nonzero urb status received: -71
cdc_wdm 1-1:1.0: wdm_int_callback - 0 bytes
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
cdc_wdm 1-1:1.0: nonzero urb status received: -71
cdc_wdm 1-1:1.0: wdm_int_callback - 0 bytes
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
cdc_wdm 1-1:1.0: nonzero urb status received: -71
cdc_wdm 1-1:1.0: wdm_int_callback - 0 bytes
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
cdc_wdm 1-1:1.0: nonzero urb status received: -71
cdc_wdm 1-1:1.0: wdm_int_callback - 0 bytes
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
cdc_wdm 1-1:1.0: nonzero urb status received: -71
cdc_wdm 1-1:1.0: wdm_int_callback - 0 bytes
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
cdc_wdm 1-1:1.0: nonzero urb status received: -71
cdc_wdm 1-1:1.0: wdm_int_callback - 0 bytes
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
cdc_wdm 1-1:1.0: nonzero urb status received: -71
cdc_wdm 1-1:1.0: wdm_int_callback - 0 bytes
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
cdc_wdm 1-1:1.0: nonzero urb status received: -71
cdc_wdm 1-1:1.0: wdm_int_callback - 0 bytes
cdc_wdm 1-1:1.0: nonzero urb status received: -71
cdc_wdm 1-1:1.0: wdm_int_callback - 0 bytes
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
cdc_wdm 1-1:1.0: nonzero urb status received: -71
cdc_wdm 1-1:1.0: wdm_int_callback - 0 bytes
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
cdc_wdm 1-1:1.0: nonzero urb status received: -71
cdc_wdm 1-1:1.0: wdm_int_callback - 0 bytes
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
cdc_wdm 1-1:1.0: nonzero urb status received: -71
cdc_wdm 1-1:1.0: wdm_int_callback - 0 bytes
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
cdc_wdm 1-1:1.0: nonzero urb status received: -71
cdc_wdm 1-1:1.0: wdm_int_callback - 0 bytes
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
cdc_wdm 1-1:1.0: nonzero urb status received: -71
cdc_wdm 1-1:1.0: wdm_int_callback - 0 bytes
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
cdc_wdm 1-1:1.0: nonzero urb status received: -71
cdc_wdm 1-1:1.0: wdm_int_callback - 0 bytes
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
cdc_wdm 1-1:1.0: nonzero urb status received: -71
cdc_wdm 1-1:1.0: wdm_int_callback - 0 bytes
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
cdc_wdm 1-1:1.0: nonzero urb status received: -71
cdc_wdm 1-1:1.0: wdm_int_callback - 0 bytes
cdc_wdm 1-1:1.0: nonzero urb status received: -71
cdc_wdm 1-1:1.0: wdm_int_callback - 0 bytes
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
cdc_wdm 1-1:1.0: nonzero urb status received: -71
cdc_wdm 1-1:1.0: wdm_int_callback - 0 bytes
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
cdc_wdm 1-1:1.0: nonzero urb status received: -71
cdc_wdm 1-1:1.0: wdm_int_callback - 0 bytes
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
cdc_wdm 1-1:1.0: nonzero urb status received: -71
cdc_wdm 1-1:1.0: wdm_int_callback - 0 bytes
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
cdc_wdm 1-1:1.0: nonzero urb status received: -71
cdc_wdm 1-1:1.0: wdm_int_callback - 0 bytes
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
cdc_wdm 1-1:1.0: nonzero urb status received: -71
cdc_wdm 1-1:1.0: wdm_int_callback - 0 bytes
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
cdc_wdm 1-1:1.0: nonzero urb status received: -71
cdc_wdm 1-1:1.0: wdm_int_callback - 0 bytes
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
cdc_wdm 1-1:1.0: nonzero urb status received: -71
cdc_wdm 1-1:1.0: wdm_int_callback - 0 bytes
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
cdc_wdm 1-1:1.0: nonzero urb status received: -71
cdc_wdm 1-1:1.0: wdm_int_callback - 0 bytes
cdc_wdm 1-1:1.0: nonzero urb status received: -71
cdc_wdm 1-1:1.0: wdm_int_callback - 0 bytes
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
cdc_wdm 1-1:1.0: nonzero urb status received: -71
cdc_wdm 1-1:1.0: wdm_int_callback - 0 bytes
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
cdc_wdm 1-1:1.0: nonzero urb status received: -71
cdc_wdm 1-1:1.0: wdm_int_callback - 0 bytes
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
usb 4-1: USB disconnect, device number 115
Mem-Info:
active_anon:371 inactive_anon:11586 isolated_anon:0
 active_file:5266 inactive_file:40430 isolated_file:0
 unevictable:0 dirty:0 writeback:0
 slab_reclaimable:4762 slab_unreclaimable:67789
 mapped:19965 shmem:854 pagetables:805
 sec_pagetables:0 bounce:0
 kernel_misc_reclaimable:0
 free:1494172 free_pcp:404 free_cma:0
Node 0 active_anon:1484kB inactive_anon:46344kB active_file:21064kB inactive_file:161720kB unevictable:0kB isolated(anon):0kB isolated(file):0kB mapped:79860kB dirty:0kB writeback:0kB shmem:3416kB writeback_tmp:0kB kernel_stack:4512kB pagetables:3220kB sec_pagetables:0kB all_unreclaimable? no
Node 0 DMA free:15360kB boost:0kB min:20kB low:32kB high:44kB reserved_highatomic:0KB active_anon:0kB inactive_anon:0kB active_file:0kB inactive_file:0kB unevictable:0kB writepending:0kB present:15992kB managed:15360kB mlocked:0kB bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:0kB
lowmem_reserve[]: 0 2814 6738 6738
Node 0 DMA32 free:2884872kB boost:0kB min:4380kB low:7260kB high:10140kB reserved_highatomic:0KB active_anon:0kB inactive_anon:0kB active_file:0kB inactive_file:0kB unevictable:0kB writepending:0kB present:3129332kB managed:2885244kB mlocked:0kB bounce:0kB free_pcp:372kB local_pcp:64kB free_cma:0kB
lowmem_reserve[]: 0 0 3924 3924
Node 0 Normal free:3076456kB boost:0kB min:6108kB low:10124kB high:14140kB reserved_highatomic:0KB active_anon:1484kB inactive_anon:46344kB active_file:21064kB inactive_file:161720kB unevictable:0kB writepending:0kB present:5242880kB managed:4018384kB mlocked:0kB bounce:0kB free_pcp:1244kB local_pcp:996kB free_cma:0kB
lowmem_reserve[]: 0 0 0 0
Node 0 DMA: 0*4kB 0*8kB 0*16kB 0*32kB 0*64kB 0*128kB 0*256kB 0*512kB 1*1024kB (U) 1*2048kB (M) 3*4096kB (M) 
= 15360kB
Node 0 DMA32: 4*4kB (M) 3*8kB (M) 2*16kB (M) 4*32kB (M) 3*64kB (M) 5*128kB (M) 5*256kB (M) 4*512kB (M) 3*1024kB (M) 1*2048kB (M) 702*4096kB (M) = 2884872kB
Node 0 Normal: 1404*4kB (UME) 1470*8kB (UME) 635*16kB (UME) 1119*32kB (UME) 304*64kB (UME) 184*128kB (UME) 118*256kB (UME) 61*512kB (UM) 28*1024kB (UME) 16*2048kB (UME) 695*4096kB (M) = 3075952kB
Node 0 hugepages_total=4 hugepages_free=4 hugepages_surp=0 hugepages_size=2048kB
46550 total pagecache pages
0 pages in swap cache
Free swap  = 124996kB
Total swap = 124996kB
2097051 pages RAM
0 pages HighMem/MovableOnly
367304 pages reserved
usb 5-1: USB disconnect, device number 111
usb 5-1: new high-speed USB device number 112 using dummy_hcd
usb 5-1: config 0 interface 0 altsetting 0 endpoint 0x81 has an invalid bInterval 0, changing to 7
usb 5-1: New USB device found, idVendor=0926, idProduct=3333, bcdDevice= 0.40
usb 5-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
usb 5-1: config 0 descriptor??
usbhid 5-1:0.0: can't add hid device: -71
usbhid: probe of 5-1:0.0 failed with error -71
usb 5-1: USB disconnect, device number 112
usb 5-1: new high-speed USB device number 113 using dummy_hcd
usb 5-1: config 0 interface 0 altsetting 0 endpoint 0x81 has an invalid bInterval 0, changing to 7
usb 5-1: New USB device found, idVendor=0926, idProduct=3333, bcdDevice= 0.40
usb 5-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
usb 5-1: config 0 descriptor??
keytouch 0003:0926:3333.00F2: fixing up Keytouch IEC report descriptor
input: HID 0926:3333 as /devices/platform/dummy_hcd.4/usb5/5-1/5-1:0.0/0003:0926:3333.00F2/input/input681
keytouch 0003:0926:3333.00F2: input,hidraw0: USB HID v0.00 Keyboard [HID 0926:3333] on usb-dummy_hcd.4-1/input0