rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P17760/1:b..l
rcu: (detected by 1, t=10506 jiffies, g=118117, q=469 ncpus=2)
task:syz.2.2426 state:R running task stack:26840 pid:17760 tgid:17758 ppid:14684 task_flags:0x40044c flags:0x00080001
Call Trace:
context_switch kernel/sched/core.c:5387 [inline]
__schedule+0x17b4/0x5680 kernel/sched/core.c:7188
preempt_schedule_common+0x82/0xd0 kernel/sched/core.c:7369
preempt_schedule_thunk+0x16/0x30 arch/x86/entry/thunk.S:12
__raw_spin_unlock include/linux/spinlock_api_smp.h:169 [inline]
_raw_spin_unlock+0x3f/0x50 kernel/locking/spinlock.c:190
spin_unlock include/linux/spinlock.h:390 [inline]
zap_pte_range mm/memory.c:1948 [inline]
zap_pmd_range mm/memory.c:2004 [inline]
zap_pud_range mm/memory.c:2032 [inline]
zap_p4d_range mm/memory.c:2053 [inline]
__zap_vma_range+0x3d17/0x4b40 mm/memory.c:2093
unmap_vmas+0x379/0x530 mm/memory.c:2162
exit_mmap+0x280/0x9e0 mm/mmap.c:1300
__mmput+0x118/0x430 kernel/fork.c:1178
exit_mm+0x18e/0x250 kernel/exit.c:581
do_exit+0x6a2/0x22c0 kernel/exit.c:963
do_group_exit+0x21b/0x2d0 kernel/exit.c:1117
get_signal+0x1284/0x1330 kernel/signal.c:3037
arch_do_signal_or_restart+0xbc/0x830 arch/x86/kernel/signal.c:337
__exit_to_user_mode_loop kernel/entry/common.c:64 [inline]
exit_to_user_mode_loop+0x86/0x480 kernel/entry/common.c:98
__exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:238 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:318 [inline]
do_syscall_64+0x33e/0xf80 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f542339cdd9
RSP: 002b:00007f542420d028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffed RBX: 00007f5423616090 RCX: 00007f542339cdd9
RDX: 0000200000000080 RSI: 0000000000008982 RDI: 0000000000000003
RBP: 00007f5423432d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f5423616128 R14: 00007f5423616090 R15: 00007ffedce91fd8
rcu: rcu_preempt kthread timer wakeup didn't happen for 10505 jiffies! g118117 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: Possible timer handling issue on cpu=0 timer-softirq=75742
rcu: rcu_preempt kthread starved for 10506 jiffies! g118117 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:27640 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5387 [inline]
__schedule+0x17b4/0x5680 kernel/sched/core.c:7188
__schedule_loop kernel/sched/core.c:7267 [inline]
schedule+0x164/0x360 kernel/sched/core.c:7282
schedule_timeout+0x158/0x2c0 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x312/0x11d0 kernel/rcu/tree.c:2095
rcu_gp_kthread+0x9e/0x2b0 kernel/rcu/tree.c:2297
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:
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 17765 Comm: syz.9.2416 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
RIP: 0010:__run_hrtimer kernel/time/hrtimer.c:1928 [inline]
RIP: 0010:__hrtimer_run_queues+0x3a4/0xa20 kernel/time/hrtimer.c:1994
Code: e8 31 2e 13 00 65 4c 8b 25 81 3a 86 11 49 81 c4 78 0b 00 00 4c 89 e3 48 c1 eb 03 49 be 00 00 00 00 00 fc ff df 42 0f b6 04 33 <84> c0 0f 85 e2 02 00 00 41 c7 04 24 01 00 00 00 48 89 ef 4d 89 fb
RSP: 0018:ffffc90000007dd8 EFLAGS: 00000012
RAX: 0000000000000000 RBX: 1ffff110051fccf7 RCX: ffff888028fe5c40
RDX: 0000000000010000 RSI: ffffffff8c28aa40 RDI: ffffffff8c28aa00
RBP: ffff888031271300 R08: ffffffff903096f7 R09: 1ffffffff20612de
R10: dffffc0000000000 R11: fffffbfff20612df R12: ffff888028fe67b8
R13: 1ffff110170c507a R14: dffffc0000000000 R15: ffffffff89b7e080
FS: 00007ff3aa1f96c0(0000) GS:ffff888125295000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f30c5e5d000 CR3: 000000005180d000 CR4: 0000000000350ef0
Call Trace:
hrtimer_interrupt+0x44b/0x950 kernel/time/hrtimer.c:2113
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
__sysvec_apic_timer_interrupt+0x102/0x430 arch/x86/kernel/apic/apic.c:1067
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1061 [inline]
sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1061
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:generic_exec_single+0x3e7/0x430 kernel/smp.c:467
Code: 75 11 e8 7c 0b 0c 00 48 85 db 75 16 e8 72 0b 0c 00 eb 15 e8 6b 0b 0c 00 e8 d6 1c ee 09 48 85 db 74 ea e8 5c 0b 0c 00 fb 31 c0 <48> 83 c4 08 5b 41 5c 41 5d 41 5e 41 5f 5d e9 a1 a8 56 ff cc e8 40
RSP: 0018:ffffc9000ed2f9c8 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000000000200 RCX: ffff888028fe5c40
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000001 R08: ffffffff903096f7 R09: 1ffffffff20612de
R10: dffffc0000000000 R11: fffffbfff20612df R12: 1ffff92001da5f51
R13: 1ffff92001da5f53 R14: 0000000000000000 R15: ffffc9000ed2fa98
smp_call_function_single_async+0x79/0x110 kernel/smp.c:747
rdmsr_safe_on_cpu+0x165/0x2b0 arch/x86/lib/msr-smp.c:179
msr_read+0x150/0x250 arch/x86/kernel/msr.c:66
vfs_read+0x20c/0xa70 fs/read_write.c:572
ksys_read+0x150/0x270 fs/read_write.c:717
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff3a939cdd9
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:00007ff3aa1f9028 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 00007ff3a9616090 RCX: 00007ff3a939cdd9
RDX: 0000000000018ff8 RSI: 0000200000019680 RDI: 000000000000000a
RBP: 00007ff3a9432d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ff3a9616128 R14: 00007ff3a9616090 R15: 00007ffc29eedce8