Extracting prog: 12m39.66379068s
Minimizing prog: 50m39.290677217s
Simplifying prog options: 27m16.560937993s
Extracting C: 5m14.269855619s
Simplifying C: 0s


extracting reproducer from 1 programs
testing a last program of every proc
single: executing 1 programs separately with timeout 30s
testing program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:namespace SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_usb_connect-syz_usb_control_io$cdc_ecm-syz_usb_control_io$cdc_ecm
detailed listing:
executing program 0:
r0 = syz_usb_connect(0x0, 0x34, &(0x7f00000000c0)=ANY=[@ANYBLOB="120100002c464708c2153b003e66010203010902220001000000000904000001e3fe11000905000000000000000705936b908c7f"], 0x0)
syz_usb_control_io$cdc_ecm(r0, 0x0, 0x0)
syz_usb_control_io$cdc_ecm(r0, &(0x7f0000000100)={0x14, 0x0, 0x0}, 0x0)

program did not crash
single: failed to extract reproducer
single: executing 1 programs separately with timeout 1m40s
testing program (duration=1m40s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:namespace SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_usb_connect-syz_usb_control_io$cdc_ecm-syz_usb_control_io$cdc_ecm
detailed listing:
executing program 0:
r0 = syz_usb_connect(0x0, 0x34, &(0x7f00000000c0)=ANY=[@ANYBLOB="120100002c464708c2153b003e66010203010902220001000000000904000001e3fe11000905000000000000000705936b908c7f"], 0x0)
syz_usb_control_io$cdc_ecm(r0, 0x0, 0x0)
syz_usb_control_io$cdc_ecm(r0, &(0x7f0000000100)={0x14, 0x0, 0x0}, 0x0)

program did not crash
single: failed to extract reproducer
single: executing 1 programs separately with timeout 6m0s
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:namespace SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_usb_connect-syz_usb_control_io$cdc_ecm-syz_usb_control_io$cdc_ecm
detailed listing:
executing program 0:
r0 = syz_usb_connect(0x0, 0x34, &(0x7f00000000c0)=ANY=[@ANYBLOB="120100002c464708c2153b003e66010203010902220001000000000904000001e3fe11000905000000000000000705936b908c7f"], 0x0)
syz_usb_control_io$cdc_ecm(r0, 0x0, 0x0)
syz_usb_control_io$cdc_ecm(r0, &(0x7f0000000100)={0x14, 0x0, 0x0}, 0x0)

program crashed: INFO: rcu detected stall in corrupted
single: successfully extracted reproducer
found reproducer with 3 syscalls
minimizing guilty program
testing program (duration=8m13.692705039s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:namespace SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_usb_connect-syz_usb_control_io$cdc_ecm
detailed listing:
executing program 0:
r0 = syz_usb_connect(0x0, 0x34, &(0x7f00000000c0)=ANY=[@ANYBLOB="120100002c464708c2153b003e66010203010902220001000000000904000001e3fe11000905000000000000000705936b908c7f"], 0x0)
syz_usb_control_io$cdc_ecm(r0, 0x0, 0x0)

program did not crash
testing program (duration=8m13.692705039s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:namespace SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_usb_connect-syz_usb_control_io$cdc_ecm
detailed listing:
executing program 0:
r0 = syz_usb_connect(0x0, 0x34, &(0x7f00000000c0)=ANY=[@ANYBLOB="120100002c464708c2153b003e66010203010902220001000000000904000001e3fe11000905000000000000000705936b908c7f"], 0x0)
syz_usb_control_io$cdc_ecm(r0, &(0x7f0000000100)={0x14, 0x0, 0x0}, 0x0)

program did not crash
testing program (duration=8m13.692705039s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:namespace SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_usb_control_io$cdc_ecm-syz_usb_control_io$cdc_ecm
detailed listing:
executing program 0:
syz_usb_control_io$cdc_ecm(0xffffffffffffffff, 0x0, 0x0)
syz_usb_control_io$cdc_ecm(0xffffffffffffffff, &(0x7f0000000100)={0x14, 0x0, 0x0}, 0x0)

program did not crash
testing program (duration=8m13.692705039s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:namespace SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_usb_connect-syz_usb_control_io$cdc_ecm-syz_usb_control_io$cdc_ecm
detailed listing:
executing program 0:
r0 = syz_usb_connect(0x0, 0x34, 0x0, 0x0)
syz_usb_control_io$cdc_ecm(r0, 0x0, 0x0)
syz_usb_control_io$cdc_ecm(r0, &(0x7f0000000100)={0x14, 0x0, 0x0}, 0x0)

program did not crash
testing program (duration=8m13.692705039s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:namespace SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_usb_connect-syz_usb_control_io$cdc_ecm-syz_usb_control_io$cdc_ecm
detailed listing:
executing program 0:
r0 = syz_usb_connect(0x0, 0x34, &(0x7f00000000c0)=ANY=[@ANYBLOB], 0x0)
syz_usb_control_io$cdc_ecm(r0, 0x0, 0x0)
syz_usb_control_io$cdc_ecm(r0, &(0x7f0000000100)={0x14, 0x0, 0x0}, 0x0)

program did not crash
testing program (duration=8m13.692705039s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:namespace SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_usb_connect-syz_usb_control_io$cdc_ecm-syz_usb_control_io$cdc_ecm
detailed listing:
executing program 0:
r0 = syz_usb_connect(0x0, 0x34, &(0x7f00000000c0)=ANY=[@ANYBLOB="120100002c464708c2153b003e66010203010902220001000000000904000001e3fe11000905000000000000000705936b908c7f"], 0x0)
syz_usb_control_io$cdc_ecm(r0, 0x0, 0x0)
syz_usb_control_io$cdc_ecm(r0, 0x0, 0x0)

program did not crash
extracting C reproducer
testing compiled C program (duration=8m13.692705039s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:namespace SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_usb_connect-syz_usb_control_io$cdc_ecm-syz_usb_control_io$cdc_ecm
program crashed: no output from test machine
a never seen crash title: no output from test machine, ignore
simplifying guilty program options
testing program (duration=8m13.692705039s, {Threaded:false Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:namespace SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_usb_connect-syz_usb_control_io$cdc_ecm-syz_usb_control_io$cdc_ecm
detailed listing:
executing program 0:
r0 = syz_usb_connect(0x0, 0x34, &(0x7f00000000c0)=ANY=[@ANYBLOB="120100002c464708c2153b003e66010203010902220001000000000904000001e3fe11000905000000000000000705936b908c7f"], 0x0)
syz_usb_control_io$cdc_ecm(r0, 0x0, 0x0)
syz_usb_control_io$cdc_ecm(r0, &(0x7f0000000100)={0x14, 0x0, 0x0}, 0x0)

program did not crash
testing program (duration=8m13.692705039s, {Threaded:true Repeat:true RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:namespace SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_usb_connect-syz_usb_control_io$cdc_ecm-syz_usb_control_io$cdc_ecm
detailed listing:
executing program 0:
r0 = syz_usb_connect(0x0, 0x34, &(0x7f00000000c0)=ANY=[@ANYBLOB="120100002c464708c2153b003e66010203010902220001000000000904000001e3fe11000905000000000000000705936b908c7f"], 0x0)
syz_usb_control_io$cdc_ecm(r0, 0x0, 0x0)
syz_usb_control_io$cdc_ecm(r0, &(0x7f0000000100)={0x14, 0x0, 0x0}, 0x0)

program did not crash
testing program (duration=8m13.692705039s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_usb_connect-syz_usb_control_io$cdc_ecm-syz_usb_control_io$cdc_ecm
detailed listing:
executing program 0:
r0 = syz_usb_connect(0x0, 0x34, &(0x7f00000000c0)=ANY=[@ANYBLOB="120100002c464708c2153b003e66010203010902220001000000000904000001e3fe11000905000000000000000705936b908c7f"], 0x0)
syz_usb_control_io$cdc_ecm(r0, 0x0, 0x0)
syz_usb_control_io$cdc_ecm(r0, &(0x7f0000000100)={0x14, 0x0, 0x0}, 0x0)

program did not crash
reproducing took 1h35m49.785284125s
repro crashed as (corrupted=true):
rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	(detected by 0, t=10502 jiffies, g=24161, q=201159 ncpus=2)
rcu: All QSes seen, last rcu_preempt kthread activity 1630 (4294986552-4294984922), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread starved for 1631 jiffies! g24161 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x0 ->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:R
  running task    
 stack:27032 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5382 [inline]
 __schedule+0x16e2/0x4cd0 kernel/sched/core.c:6767
 __schedule_loop kernel/sched/core.c:6845 [inline]
 schedule+0x165/0x360 kernel/sched/core.c:6860
 schedule_timeout+0x12b/0x270 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x301/0x1540 kernel/rcu/tree.c:2046
 rcu_gp_kthread+0x99/0x390 kernel/rcu/tree.c:2248
 kthread+0x70e/0x8a0 kernel/kthread.c:464
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 0 UID: 101 PID: 6426 Comm: dhcpcd Not tainted 6.15.0-rc5-syzkaller-00022-g01f95500a162 #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/29/2025
RIP: 0010:csd_lock_wait kernel/smp.c:340 [inline]
RIP: 0010:smp_call_function_many_cond+0xe69/0x11c0 kernel/smp.c:885
Code: 00 45 8b 2f 44 89 ee 83 e6 01 31 ff e8 20 6d 0b 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 cb 68 0b 00 eb 37 f3 90 <43> 0f b6 04 2c 84 c0 75 10 41 f7 07 01 00 00 00 74 1e e8 b0 68 0b
RSP: 0018:ffffc9000440f700 EFLAGS: 00000293

RAX: ffffffff81b467a0 RBX: ffff8880b883ad40 RCX: ffff888024d83c00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc9000440f860 R08: ffffffff8f7ed977 R09: 1ffffffff1efdb2e
R10: dffffc0000000000 R11: fffffbfff1efdb2f R12: 1ffff11017127e99
R13: dffffc0000000000 R14: 0000000000000001 R15: ffff8880b893f4c8
FS:  0000000000000000(0000) GS:ffff8881260cb000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffe023f2b98 CR3: 000000002f686000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1052
 __flush_tlb_multi arch/x86/include/asm/paravirt.h:91 [inline]
 flush_tlb_multi arch/x86/mm/tlb.c:1275 [inline]
 flush_tlb_mm_range+0x6ae/0x12b0 arch/x86/mm/tlb.c:1365
 tlb_flush arch/x86/include/asm/tlb.h:23 [inline]
 tlb_flush_mmu_tlbonly include/asm-generic/tlb.h:480 [inline]
 tlb_flush_mmu+0x1a7/0x680 mm/mmu_gather.c:403
 tlb_finish_mmu+0xc3/0x1d0 mm/mmu_gather.c:496
 exit_mmap+0x474/0xba0 mm/mmap.c:1297
 __mmput+0x118/0x420 kernel/fork.c:1379
 exit_mm+0x1da/0x2c0 kernel/exit.c:589
 do_exit+0x859/0x2550 kernel/exit.c:940
 do_group_exit+0x21c/0x2d0 kernel/exit.c:1102
 __do_sys_exit_group kernel/exit.c:1113 [inline]
 __se_sys_exit_group kernel/exit.c:1111 [inline]
 __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1111
 x64_sys_call+0x21ba/0x21c0 arch/x86/include/generated/asm/syscalls_64.h:232
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f2f84459a90
Code: Unable to access opcode bytes at 0x7f2f84459a66.
RSP: 002b:00007ffe02402d68 EFLAGS: 00000202
 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007f2f843a96c0 RCX: 00007f2f84459a90
RDX: 00000000000000e7 RSI: 000000000000003c RDI: 0000000000000000
RBP: 00007ffe02402de8 R08: 0000000000000007 R09: 61c92b8049d31f21
R10: 0000000000000120 R11: 0000000000000202 R12: 0000000000000000
R13: 00007ffe024033b8 R14: 0000000000000003 R15: 0000000000000000
 </TASK>

report is corrupted, running repro again
testing program (duration=8m13.692705039s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:namespace SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_usb_connect-syz_usb_control_io$cdc_ecm-syz_usb_control_io$cdc_ecm
detailed listing:
executing program 0:
r0 = syz_usb_connect(0x0, 0x34, &(0x7f00000000c0)=ANY=[@ANYBLOB="120100002c464708c2153b003e66010203010902220001000000000904000001e3fe11000905000000000000000705936b908c7f"], 0x0)
syz_usb_control_io$cdc_ecm(r0, 0x0, 0x0)
syz_usb_control_io$cdc_ecm(r0, &(0x7f0000000100)={0x14, 0x0, 0x0}, 0x0)

program did not crash
report is corrupted, running repro again
testing program (duration=8m13.692705039s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:namespace SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_usb_connect-syz_usb_control_io$cdc_ecm-syz_usb_control_io$cdc_ecm
detailed listing:
executing program 0:
r0 = syz_usb_connect(0x0, 0x34, &(0x7f00000000c0)=ANY=[@ANYBLOB="120100002c464708c2153b003e66010203010902220001000000000904000001e3fe11000905000000000000000705936b908c7f"], 0x0)
syz_usb_control_io$cdc_ecm(r0, 0x0, 0x0)
syz_usb_control_io$cdc_ecm(r0, &(0x7f0000000100)={0x14, 0x0, 0x0}, 0x0)

program did not crash
report is corrupted, running repro again
testing program (duration=8m13.692705039s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:namespace SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_usb_connect-syz_usb_control_io$cdc_ecm-syz_usb_control_io$cdc_ecm
detailed listing:
executing program 0:
r0 = syz_usb_connect(0x0, 0x34, &(0x7f00000000c0)=ANY=[@ANYBLOB="120100002c464708c2153b003e66010203010902220001000000000904000001e3fe11000905000000000000000705936b908c7f"], 0x0)
syz_usb_control_io$cdc_ecm(r0, 0x0, 0x0)
syz_usb_control_io$cdc_ecm(r0, &(0x7f0000000100)={0x14, 0x0, 0x0}, 0x0)

program did not crash
final repro crashed as (corrupted=true):
rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	(detected by 0, t=10502 jiffies, g=24161, q=201159 ncpus=2)
rcu: All QSes seen, last rcu_preempt kthread activity 1630 (4294986552-4294984922), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread starved for 1631 jiffies! g24161 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x0 ->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:R
  running task    
 stack:27032 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5382 [inline]
 __schedule+0x16e2/0x4cd0 kernel/sched/core.c:6767
 __schedule_loop kernel/sched/core.c:6845 [inline]
 schedule+0x165/0x360 kernel/sched/core.c:6860
 schedule_timeout+0x12b/0x270 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x301/0x1540 kernel/rcu/tree.c:2046
 rcu_gp_kthread+0x99/0x390 kernel/rcu/tree.c:2248
 kthread+0x70e/0x8a0 kernel/kthread.c:464
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 0 UID: 101 PID: 6426 Comm: dhcpcd Not tainted 6.15.0-rc5-syzkaller-00022-g01f95500a162 #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/29/2025
RIP: 0010:csd_lock_wait kernel/smp.c:340 [inline]
RIP: 0010:smp_call_function_many_cond+0xe69/0x11c0 kernel/smp.c:885
Code: 00 45 8b 2f 44 89 ee 83 e6 01 31 ff e8 20 6d 0b 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 cb 68 0b 00 eb 37 f3 90 <43> 0f b6 04 2c 84 c0 75 10 41 f7 07 01 00 00 00 74 1e e8 b0 68 0b
RSP: 0018:ffffc9000440f700 EFLAGS: 00000293

RAX: ffffffff81b467a0 RBX: ffff8880b883ad40 RCX: ffff888024d83c00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc9000440f860 R08: ffffffff8f7ed977 R09: 1ffffffff1efdb2e
R10: dffffc0000000000 R11: fffffbfff1efdb2f R12: 1ffff11017127e99
R13: dffffc0000000000 R14: 0000000000000001 R15: ffff8880b893f4c8
FS:  0000000000000000(0000) GS:ffff8881260cb000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffe023f2b98 CR3: 000000002f686000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1052
 __flush_tlb_multi arch/x86/include/asm/paravirt.h:91 [inline]
 flush_tlb_multi arch/x86/mm/tlb.c:1275 [inline]
 flush_tlb_mm_range+0x6ae/0x12b0 arch/x86/mm/tlb.c:1365
 tlb_flush arch/x86/include/asm/tlb.h:23 [inline]
 tlb_flush_mmu_tlbonly include/asm-generic/tlb.h:480 [inline]
 tlb_flush_mmu+0x1a7/0x680 mm/mmu_gather.c:403
 tlb_finish_mmu+0xc3/0x1d0 mm/mmu_gather.c:496
 exit_mmap+0x474/0xba0 mm/mmap.c:1297
 __mmput+0x118/0x420 kernel/fork.c:1379
 exit_mm+0x1da/0x2c0 kernel/exit.c:589
 do_exit+0x859/0x2550 kernel/exit.c:940
 do_group_exit+0x21c/0x2d0 kernel/exit.c:1102
 __do_sys_exit_group kernel/exit.c:1113 [inline]
 __se_sys_exit_group kernel/exit.c:1111 [inline]
 __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1111
 x64_sys_call+0x21ba/0x21c0 arch/x86/include/generated/asm/syscalls_64.h:232
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f2f84459a90
Code: Unable to access opcode bytes at 0x7f2f84459a66.
RSP: 002b:00007ffe02402d68 EFLAGS: 00000202
 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007f2f843a96c0 RCX: 00007f2f84459a90
RDX: 00000000000000e7 RSI: 000000000000003c RDI: 0000000000000000
RBP: 00007ffe02402de8 R08: 0000000000000007 R09: 61c92b8049d31f21
R10: 0000000000000120 R11: 0000000000000202 R12: 0000000000000000
R13: 00007ffe024033b8 R14: 0000000000000003 R15: 0000000000000000
 </TASK>