Extracting prog: 4m30.589010751s Minimizing prog: 29m33.453725246s Simplifying prog options: 5m3.023448295s Extracting C: 2m22.116129957s Simplifying C: 0s extracting reproducer from 1 programs testing a last program of every proc single: executing 1 programs separately with timeout 6m0s testing program (duration=6m0s, {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 CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$netlink-sendto detailed listing: executing program 0: r0 = socket$netlink(0x10, 0x3, 0x0) sendto(r0, &(0x7f0000000000)="68000000300005050100000000000000000000005400018050000180090001006761746500000000400002801800020000000000000000000000000000000000000000001800058014000180080001000000000008000300640000000c000700e80300ffffffffff", 0x68, 0x0, 0x0, 0x0) program crashed: INFO: rcu detected stall in corrupted single: successfully extracted reproducer found reproducer with 2 syscalls minimizing guilty program testing program (duration=6m0s, {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 CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$netlink detailed listing: executing program 0: socket$netlink(0x10, 0x3, 0x0) VM was preempted during syz execution: failed to run command in VM: instance is preempted, retrying program did not crash testing program (duration=6m0s, {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 CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): sendto detailed listing: executing program 0: sendto(0xffffffffffffffff, &(0x7f0000000000)="68000000300005050100000000000000000000005400018050000180090001006761746500000000400002801800020000000000000000000000000000000000000000001800058014000180080001000000000008000300640000000c000700e80300ffffffffff", 0x68, 0x0, 0x0, 0x0) program did not crash testing program (duration=6m0s, {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 CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$netlink-sendto detailed listing: executing program 0: r0 = socket$netlink(0x10, 0x3, 0x0) sendto(r0, 0x0, 0x0, 0x0, 0x0, 0x0) program did not crash testing program (duration=6m0s, {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 CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$netlink-sendto detailed listing: executing program 0: r0 = socket$netlink(0x10, 0x3, 0x0) sendto(r0, &(0x7f0000000000), 0x0, 0x0, 0x0, 0x0) program did not crash extracting C reproducer testing compiled C program (duration=6m0s, {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 CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$netlink-sendto program crashed: INFO: rcu detected stall in tc_ctl_action a never seen crash title: INFO: rcu detected stall in tc_ctl_action, ignore simplifying guilty program options testing program (duration=6m0s, {Threaded:false Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$netlink-sendto detailed listing: executing program 0: r0 = socket$netlink(0x10, 0x3, 0x0) sendto(r0, &(0x7f0000000000)="68000000300005050100000000000000000000005400018050000180090001006761746500000000400002801800020000000000000000000000000000000000000000001800058014000180080001000000000008000300640000000c000700e80300ffffffffff", 0x68, 0x0, 0x0, 0x0) program crashed: INFO: rcu detected stall in tc_ctl_action a never seen crash title: INFO: rcu detected stall in tc_ctl_action, ignore testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$netlink-sendto detailed listing: executing program 0: r0 = socket$netlink(0x10, 0x3, 0x0) sendto(r0, &(0x7f0000000000)="68000000300005050100000000000000000000005400018050000180090001006761746500000000400002801800020000000000000000000000000000000000000000001800058014000180080001000000000008000300640000000c000700e80300ffffffffff", 0x68, 0x0, 0x0, 0x0) program crashed: INFO: rcu detected stall in tc_ctl_action a never seen crash title: INFO: rcu detected stall in tc_ctl_action, ignore testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$netlink-sendto detailed listing: executing program 0: r0 = socket$netlink(0x10, 0x3, 0x0) sendto(r0, &(0x7f0000000000)="68000000300005050100000000000000000000005400018050000180090001006761746500000000400002801800020000000000000000000000000000000000000000001800058014000180080001000000000008000300640000000c000700e80300ffffffffff", 0x68, 0x0, 0x0, 0x0) program crashed: INFO: rcu detected stall in corrupted validation run: crashed=true testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$netlink-sendto detailed listing: executing program 0: r0 = socket$netlink(0x10, 0x3, 0x0) sendto(r0, &(0x7f0000000000)="68000000300005050100000000000000000000005400018050000180090001006761746500000000400002801800020000000000000000000000000000000000000000001800058014000180080001000000000008000300640000000c000700e80300ffffffffff", 0x68, 0x0, 0x0, 0x0) program crashed: INFO: rcu detected stall in corrupted validation run: crashed=true testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$netlink-sendto detailed listing: executing program 0: r0 = socket$netlink(0x10, 0x3, 0x0) sendto(r0, &(0x7f0000000000)="68000000300005050100000000000000000000005400018050000180090001006761746500000000400002801800020000000000000000000000000000000000000000001800058014000180080001000000000008000300640000000c000700e80300ffffffffff", 0x68, 0x0, 0x0, 0x0) program crashed: INFO: rcu detected stall in corrupted validation run: crashed=true reproducing took 49m17.619146059s repro crashed as (corrupted=true): rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 0-....: (1 GPs behind) idle=6c04/1/0x4000000000000000 softirq=16505/16509 fqs=5250 rcu: hardirqs softirqs csw/system rcu: number: 5272 0 0 rcu: cputime: 91 52398 6 ==> 52500(ms) rcu: (t=10502 jiffies g=15853 q=5242 ncpus=2) CPU: 0 UID: 0 PID: 5975 Comm: syz.1.18 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:179 [inline] RIP: 0010:_raw_spin_unlock_irqrestore+0x47/0x80 kernel/locking/spinlock.c:198 Code: f7 e8 2d 7d d0 f5 f7 c3 00 02 00 00 74 05 e8 00 5e fc f5 9c 58 a9 00 02 00 00 75 27 f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 c4 90 c1 f5 65 8b 05 bd a0 99 07 85 c0 74 18 5b 41 5e c3 cc cc RSP: 0018:ffffc90000007e30 EFLAGS: 00000206 RAX: 0000000000000002 RBX: 0000000000000246 RCX: 0000000000000102 RDX: 0000000000000002 RSI: ffffffff8e227e64 RDI: 0000000000000001 RBP: ffff88807fa19938 R08: ffffffff90573637 R09: 1ffffffff20ae6c6 R10: dffffc0000000000 R11: fffffbfff20ae6c7 R12: ffff8880b86281c0 R13: ffffffff89cd5bf0 R14: ffff8880b86281c0 R15: 1ffff110170c50c2 FS: 00007f21dc8106c0(0000) GS:ffff888124f58000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007efeb5fede9c CR3: 0000000073f42000 CR4: 00000000003526f0 Call Trace: __run_hrtimer kernel/time/hrtimer.c:2028 [inline] __hrtimer_run_queues+0x2bf/0xa10 kernel/time/hrtimer.c:2096 hrtimer_run_softirq+0x17a/0x240 kernel/time/hrtimer.c:2113 handle_softirqs+0x225/0x840 kernel/softirq.c:622 do_softirq+0x76/0xd0 kernel/softirq.c:523 __local_bh_enable_ip+0xf8/0x130 kernel/softirq.c:450 spin_unlock_bh include/linux/spinlock.h:396 [inline] tcf_gate_init+0x1266/0x15a0 net/sched/act_gate.c:528 tcf_action_init_1+0x4ba/0x740 net/sched/act_api.c:1433 tcf_action_init+0x30e/0xb10 net/sched/act_api.c:1508 tcf_action_add net/sched/act_api.c:2106 [inline] tc_ctl_action+0x43b/0xc70 net/sched/act_api.c:2163 rtnetlink_rcv_msg+0x7b9/0xc00 net/core/rtnetlink.c:7085 netlink_rcv_skb+0x226/0x4a0 net/netlink/af_netlink.c:2556 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline] netlink_unicast+0x7bb/0x940 net/netlink/af_netlink.c:1345 netlink_sendmsg+0x813/0xb40 net/netlink/af_netlink.c:1900 sock_sendmsg_nosec+0x13a/0x180 net/socket.c:775 __sock_sendmsg net/socket.c:790 [inline] __sys_sendto+0x408/0x5a0 net/socket.c:2252 __do_sys_sendto net/socket.c:2259 [inline] __se_sys_sendto net/socket.c:2255 [inline] __x64_sys_sendto+0xde/0x100 net/socket.c:2255 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f21db99e0d9 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:00007f21dc810028 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007f21dbc25fa0 RCX: 00007f21db99e0d9 RDX: 0000000000000068 RSI: 0000200000000000 RDI: 0000000000000003 RBP: 00007f21dba35024 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f21dbc26038 R14: 00007f21dbc25fa0 R15: 00007fffd7be9f48 sched: DL replenish lagged too much report is corrupted, running repro again testing program (duration=6m0s, {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 CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$netlink-sendto detailed listing: executing program 0: r0 = socket$netlink(0x10, 0x3, 0x0) sendto(r0, &(0x7f0000000000)="68000000300005050100000000000000000000005400018050000180090001006761746500000000400002801800020000000000000000000000000000000000000000001800058014000180080001000000000008000300640000000c000700e80300ffffffffff", 0x68, 0x0, 0x0, 0x0) program crashed: INFO: rcu detected stall in corrupted report is corrupted, running repro again testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$netlink-sendto detailed listing: executing program 0: r0 = socket$netlink(0x10, 0x3, 0x0) sendto(r0, &(0x7f0000000000)="68000000300005050100000000000000000000005400018050000180090001006761746500000000400002801800020000000000000000000000000000000000000000001800058014000180080001000000000008000300640000000c000700e80300ffffffffff", 0x68, 0x0, 0x0, 0x0) program crashed: INFO: rcu detected stall in __hrtimer_run_queues final repro crashed as (corrupted=false): rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P5762 rcu: (detected by 0, t=10502 jiffies, g=15917, q=4592 ncpus=2) task:syz-executor state:R running task stack:22408 pid:5762 tgid:5762 ppid:1 task_flags:0x400140 flags:0x00080012 Call Trace: sched_show_task+0x4aa/0x5f0 kernel/sched/core.c:8184 rcu_print_detail_task_stall_rnp kernel/rcu/tree_stall.h:292 [inline] print_other_cpu_stall+0xf7d/0x1310 kernel/rcu/tree_stall.h:680 check_cpu_stall kernel/rcu/tree_stall.h:855 [inline] rcu_pending kernel/rcu/tree.c:3708 [inline] rcu_sched_clock_irq+0x93d/0x1050 kernel/rcu/tree.c:2744 update_process_times+0x23b/0x2f0 kernel/time/timer.c:2475 tick_sched_handle kernel/time/tick-sched.c:296 [inline] tick_nohz_handler+0x38f/0x6b0 kernel/time/tick-sched.c:317 __run_hrtimer kernel/time/hrtimer.c:2032 [inline] __hrtimer_run_queues+0x371/0xa10 kernel/time/hrtimer.c:2096 hrtimer_interrupt+0x448/0x910 kernel/time/hrtimer.c:2215 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1051 [inline] __sysvec_apic_timer_interrupt+0x102/0x430 arch/x86/kernel/apic/apic.c:1068 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline] sysvec_apic_timer_interrupt+0x52/0xc0 arch/x86/kernel/apic/apic.c:1062 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674 RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:179 [inline] RIP: 0010:_raw_spin_unlock_irqrestore+0x47/0x80 kernel/locking/spinlock.c:198 Code: f7 e8 2d 7d d0 f5 f7 c3 00 02 00 00 74 05 e8 00 5e fc f5 9c 58 a9 00 02 00 00 75 27 f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 c4 90 c1 f5 65 8b 05 bd a0 99 07 85 c0 74 18 5b 41 5e c3 cc cc RSP: 0018:ffffc90000007e08 EFLAGS: 00000206 RAX: 0000000000000002 RBX: 0000000000000246 RCX: 0000000000000102 RDX: 0000000000000000 RSI: ffffffff8e227e64 RDI: 0000000000000001 RBP: ffff88807b4d0938 R08: ffffffff90573637 R09: 1ffffffff20ae6c6 R10: dffffc0000000000 R11: fffffbfff20ae6c7 R12: ffff8880b86281c0 R13: ffffffff89cd5bf0 R14: ffff8880b86281c0 R15: 1ffff110170c50c2 __run_hrtimer kernel/time/hrtimer.c:2028 [inline] __hrtimer_run_queues+0x2bf/0xa10 kernel/time/hrtimer.c:2096 hrtimer_run_softirq+0x17a/0x240 kernel/time/hrtimer.c:2113 handle_softirqs+0x225/0x840 kernel/softirq.c:622 __do_softirq kernel/softirq.c:656 [inline] invoke_softirq kernel/softirq.c:496 [inline] __irq_exit_rcu+0xca/0x220 kernel/softirq.c:735 irq_exit_rcu+0x9/0x30 kernel/softirq.c:752 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1062 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674 RIP: 0010:finish_task_switch+0x417/0xc60 kernel/sched/core.c:5361 Code: 04 00 00 41 c7 84 24 20 0e 00 00 00 00 00 00 0f 1f 44 00 00 49 83 c4 48 4c 89 e7 e8 53 4c 3d 0a e8 de aa 39 00 fb 4c 8b 65 c8 <49> 8d bc 24 f8 16 00 00 48 89 f8 48 c1 e8 03 42 0f b6 04 30 84 c0 RSP: 0018:ffffc900031ef320 EFLAGS: 00000206 RAX: 0000000000018aa5 RBX: ffff8880b863bf20 RCX: 0000000080000001 RDX: 0000000000000000 RSI: ffffffff8e227e64 RDI: ffffffff8c4bba80 RBP: ffffc900031ef370 R08: ffffffff90573637 R09: 1ffffffff20ae6c6 R10: dffffc0000000000 R11: fffffbfff20ae6c7 R12: ffff888029f49f00 R13: ffff8880b863bee8 R14: dffffc0000000000 R15: 1ffff110170c77e4 context_switch kernel/sched/core.c:5513 [inline] __schedule+0x17e1/0x56c0 kernel/sched/core.c:7234 preempt_schedule_irq+0x4d/0xa0 kernel/sched/core.c:7556 irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:539 [inline] irqentry_exit+0x14f/0x8f0 kernel/entry/common.c:167 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674 RIP: 0010:lock_acquire+0x221/0x350 kernel/locking/lockdep.c:5872 Code: ff ff ff e8 51 6d 2d 0a f7 44 24 08 00 02 00 00 0f 84 3a ff ff ff 65 48 8b 05 db c7 c9 11 48 3b 44 24 58 75 33 fb 48 83 c4 60 <5b> 41 5c 41 5d 41 5e 41 5f 5d e9 80 6f 30 0a cc 48 8d 3d c8 0c b8 RSP: 0018:ffffc900031ef6a0 EFLAGS: 00000286 RAX: fa5918e404740300 RBX: 0000000000000000 RCX: 0000000000000046 RDX: 000000005a44979c RSI: ffffffff8e4acd09 RDI: ffffffff8c4bba80 RBP: ffffffff8177827f R08: ffffffff8177827f R09: 0000000000000000 R10: 0000000000000000 R11: ffffffff8eb59c60 R12: 0000000000000002 R13: ffffffff8eb59c60 R14: 0000000000000000 R15: 0000000000000246 rcu_lock_acquire include/linux/rcupdate.h:300 [inline] rcu_read_lock include/linux/rcupdate.h:840 [inline] class_rcu_constructor include/linux/rcupdate.h:1183 [inline] unwind_next_frame+0xac/0x2550 arch/x86/kernel/unwind_orc.c:495 arch_stack_walk+0x11b/0x150 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122 kasan_save_stack+0x3e/0x60 mm/kasan/common.c:57 kasan_record_aux_stack+0xbd/0xd0 mm/kasan/generic.c:556 __call_rcu_common kernel/rcu/tree.c:3159 [inline] call_rcu+0xee/0x8b0 kernel/rcu/tree.c:3279 __destroy_inode+0x2a1/0x630 fs/inode.c:362 destroy_inode fs/inode.c:385 [inline] evict+0x8d4/0xb50 fs/inode.c:849 dentry_kill+0x1b9/0x880 fs/dcache.c:826 finish_dput+0x1a/0x260 fs/dcache.c:1001 __fput+0x675/0xa50 fs/file_table.c:520 fput_close_sync+0x11f/0x240 fs/file_table.c:617 __do_sys_close fs/open.c:1511 [inline] __se_sys_close fs/open.c:1496 [inline] __x64_sys_close+0x7e/0x110 fs/open.c:1496 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f6c4799d247 Code: 44 00 00 48 83 ec 10 48 63 ff 45 31 c9 45 31 c0 6a 01 31 c9 e8 3a c0 fb ff 48 83 c4 18 c3 0f 1f 44 00 00 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 e8 ff ff ff f7 d8 64 89 02 b8 RSP: 002b:00007ffdab7221d8 EFLAGS: 00000246 ORIG_RAX: 0000000000000003 RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 00007f6c4799d247 RDX: 0000000000000000 RSI: 0000000000008933 RDI: 0000000000000005 RBP: 0000000000000003 R08: 0000000000000000 R09: 00000000fffffff9 R10: 0000000000000002 R11: 0000000000000246 R12: 00007ffdab722260 R13: 00007ffdab722350 R14: 00007f6c48754620 R15: 00007ffdab722350 rcu: rcu_preempt kthread timer wakeup didn't happen for 10546 jiffies! g15917 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 rcu: Possible timer handling issue on cpu=0 timer-softirq=3578 rcu: rcu_preempt kthread starved for 10577 jiffies! g15917 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I stack:27752 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000 Call Trace: context_switch kernel/sched/core.c:5510 [inline] __schedule+0x17d9/0x56c0 kernel/sched/core.c:7234 __schedule_loop kernel/sched/core.c:7311 [inline] schedule+0x164/0x2b0 kernel/sched/core.c:7326 schedule_timeout+0x152/0x2c0 kernel/time/sleep_timeout.c:99 rcu_gp_fqs_loop+0x30c/0x11f0 kernel/rcu/tree.c:2123 rcu_gp_kthread+0x9e/0x2b0 kernel/rcu/tree.c:2325 kthread+0x388/0x470 kernel/kthread.c:436 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 rcu: Stack dump where RCU GP kthread last ran: CPU: 0 UID: 0 PID: 5762 Comm: syz-executor Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:179 [inline] RIP: 0010:_raw_spin_unlock_irqrestore+0x47/0x80 kernel/locking/spinlock.c:198 Code: f7 e8 2d 7d d0 f5 f7 c3 00 02 00 00 74 05 e8 00 5e fc f5 9c 58 a9 00 02 00 00 75 27 f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 c4 90 c1 f5 65 8b 05 bd a0 99 07 85 c0 74 18 5b 41 5e c3 cc cc RSP: 0018:ffffc90000007e08 EFLAGS: 00000206 RAX: 0000000000000002 RBX: 0000000000000246 RCX: 0000000000000102 RDX: 0000000000000000 RSI: ffffffff8e227e64 RDI: 0000000000000001 RBP: ffff88807b4d0938 R08: ffffffff90573637 R09: 1ffffffff20ae6c6 R10: dffffc0000000000 R11: fffffbfff20ae6c7 R12: ffff8880b86281c0 R13: ffffffff89cd5bf0 R14: ffff8880b86281c0 R15: 1ffff110170c50c2 FS: 000055555c50f500(0000) GS:ffff888124f58000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055cf03528bd0 CR3: 000000007fb92000 CR4: 00000000003526f0 Call Trace: __run_hrtimer kernel/time/hrtimer.c:2028 [inline] __hrtimer_run_queues+0x2bf/0xa10 kernel/time/hrtimer.c:2096 hrtimer_run_softirq+0x17a/0x240 kernel/time/hrtimer.c:2113 handle_softirqs+0x225/0x840 kernel/softirq.c:622 __do_softirq kernel/softirq.c:656 [inline] invoke_softirq kernel/softirq.c:496 [inline] __irq_exit_rcu+0xca/0x220 kernel/softirq.c:735 irq_exit_rcu+0x9/0x30 kernel/softirq.c:752 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1062 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674 RIP: 0010:finish_task_switch+0x417/0xc60 kernel/sched/core.c:5361 Code: 04 00 00 41 c7 84 24 20 0e 00 00 00 00 00 00 0f 1f 44 00 00 49 83 c4 48 4c 89 e7 e8 53 4c 3d 0a e8 de aa 39 00 fb 4c 8b 65 c8 <49> 8d bc 24 f8 16 00 00 48 89 f8 48 c1 e8 03 42 0f b6 04 30 84 c0 RSP: 0018:ffffc900031ef320 EFLAGS: 00000206 RAX: 0000000000018aa5 RBX: ffff8880b863bf20 RCX: 0000000080000001 RDX: 0000000000000000 RSI: ffffffff8e227e64 RDI: ffffffff8c4bba80 RBP: ffffc900031ef370 R08: ffffffff90573637 R09: 1ffffffff20ae6c6 R10: dffffc0000000000 R11: fffffbfff20ae6c7 R12: ffff888029f49f00 R13: ffff8880b863bee8 R14: dffffc0000000000 R15: 1ffff110170c77e4 context_switch kernel/sched/core.c:5513 [inline] __schedule+0x17e1/0x56c0 kernel/sched/core.c:7234 preempt_schedule_irq+0x4d/0xa0 kernel/sched/core.c:7556 irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:539 [inline] irqentry_exit+0x14f/0x8f0 kernel/entry/common.c:167 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674 RIP: 0010:lock_acquire+0x221/0x350 kernel/locking/lockdep.c:5872 Code: ff ff ff e8 51 6d 2d 0a f7 44 24 08 00 02 00 00 0f 84 3a ff ff ff 65 48 8b 05 db c7 c9 11 48 3b 44 24 58 75 33 fb 48 83 c4 60 <5b> 41 5c 41 5d 41 5e 41 5f 5d e9 80 6f 30 0a cc 48 8d 3d c8 0c b8 RSP: 0018:ffffc900031ef6a0 EFLAGS: 00000286 RAX: fa5918e404740300 RBX: 0000000000000000 RCX: 0000000000000046 RDX: 000000005a44979c RSI: ffffffff8e4acd09 RDI: ffffffff8c4bba80 RBP: ffffffff8177827f R08: ffffffff8177827f R09: 0000000000000000 R10: 0000000000000000 R11: ffffffff8eb59c60 R12: 0000000000000002 R13: ffffffff8eb59c60 R14: 0000000000000000 R15: 0000000000000246 rcu_lock_acquire include/linux/rcupdate.h:300 [inline] rcu_read_lock include/linux/rcupdate.h:840 [inline] class_rcu_constructor include/linux/rcupdate.h:1183 [inline] unwind_next_frame+0xac/0x2550 arch/x86/kernel/unwind_orc.c:495 arch_stack_walk+0x11b/0x150 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122 kasan_save_stack+0x3e/0x60 mm/kasan/common.c:57 kasan_record_aux_stack+0xbd/0xd0 mm/kasan/generic.c:556 __call_rcu_common kernel/rcu/tree.c:3159 [inline] call_rcu+0xee/0x8b0 kernel/rcu/tree.c:3279 __destroy_inode+0x2a1/0x630 fs/inode.c:362 destroy_inode fs/inode.c:385 [inline] evict+0x8d4/0xb50 fs/inode.c:849 dentry_kill+0x1b9/0x880 fs/dcache.c:826 finish_dput+0x1a/0x260 fs/dcache.c:1001 __fput+0x675/0xa50 fs/file_table.c:520 fput_close_sync+0x11f/0x240 fs/file_table.c:617 __do_sys_close fs/open.c:1511 [inline] __se_sys_close fs/open.c:1496 [inline] __x64_sys_close+0x7e/0x110 fs/open.c:1496 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f6c4799d247 Code: 44 00 00 48 83 ec 10 48 63 ff 45 31 c9 45 31 c0 6a 01 31 c9 e8 3a c0 fb ff 48 83 c4 18 c3 0f 1f 44 00 00 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 e8 ff ff ff f7 d8 64 89 02 b8 RSP: 002b:00007ffdab7221d8 EFLAGS: 00000246 ORIG_RAX: 0000000000000003 RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 00007f6c4799d247 RDX: 0000000000000000 RSI: 0000000000008933 RDI: 0000000000000005 RBP: 0000000000000003 R08: 0000000000000000 R09: 00000000fffffff9 R10: 0000000000000002 R11: 0000000000000246 R12: 00007ffdab722260 R13: 00007ffdab722350 R14: 00007f6c48754620 R15: 00007ffdab722350 sched: DL replenish lagged too much