rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P13326/1:b..l
rcu: (detected by 0, t=10502 jiffies, g=102105, q=210 ncpus=1)
task:syz.4.1962 state:R running task stack:27160 pid:13326 tgid:13323 ppid:5599 task_flags:0x40054c flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5533 [inline]
__schedule+0x1259/0x6920 kernel/sched/core.c:7284
preempt_schedule_common+0x3c/0xb0 kernel/sched/core.c:7463
preempt_schedule_thunk+0x16/0x40 arch/x86/entry/thunk.S:12
__raw_spin_unlock include/linux/spinlock_api_smp.h:201 [inline]
_raw_spin_unlock+0x3e/0x50 kernel/locking/spinlock.c:213
spin_unlock include/linux/spinlock.h:401 [inline]
zap_pte_range mm/memory.c:2095 [inline]
zap_pmd_range mm/memory.c:2151 [inline]
zap_pud_range mm/memory.c:2179 [inline]
zap_p4d_range mm/memory.c:2200 [inline]
__zap_vma_range+0x16b0/0x48e0 mm/memory.c:2240
unmap_vmas+0x299/0x5f0 mm/memory.c:2309
exit_mmap+0x1ef/0xa00 mm/mmap.c:1315
__mmput+0x12a/0x410 kernel/fork.c:1193
mmput+0x67/0x80 kernel/fork.c:1216
exit_mm kernel/exit.c:592 [inline]
do_exit+0x83b/0x2a50 kernel/exit.c:974
do_group_exit+0xd5/0x2a0 kernel/exit.c:1129
get_signal+0x1ec7/0x21e0 kernel/signal.c:3112
arch_do_signal_or_restart+0x91/0x7e0 arch/x86/kernel/signal.c:337
__exit_to_user_mode_loop kernel/entry/common.c:66 [inline]
exit_to_user_mode_loop+0x139/0x700 kernel/entry/common.c:101
__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:230 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:343 [inline]
do_syscall_64+0x661/0x790 arch/x86/entry/syscall_64.c:89
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f3736d9e159
RSP: 002b:00007f3737d450e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00007f3737025fa8 RCX: 00007f3736d9e159
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007f3737025fac
RBP: 00007f3737025fa0 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000003 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f3737026038 R14: 00007ffd503ba6f0 R15: 00007ffd503ba7d8
rcu: rcu_preempt kthread starved for 7843 jiffies! g102105 f0x0 RCU_GP_WAIT_FQS(5) ->state=R ->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:28984 pid:17 tgid:17 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5533 [inline]
__schedule+0x1259/0x6920 kernel/sched/core.c:7284
preempt_schedule_irq+0x4e/0x90 kernel/sched/core.c:7606
irqentry_exit_to_kernel_mode_preempt include/linux/irq-entry-common.h:468 [inline]
irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:539 [inline]
irqentry_exit+0x205/0xa10 kernel/entry/common.c:167
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:__try_to_del_timer_sync+0x111/0x160 kernel/time/timer.c:1452
Code: 80 3c 02 00 75 68 48 c7 43 18 00 00 00 00 e8 46 4c 15 00 48 8b 74 24 20 48 89 ef e8 79 ae de 09 48 b8 00 00 00 00 00 fc ff df <49> c7 04 04 00 00 00 00 48 8b 44 24 58 65 48 2b 05 52 22 96 12 75
RSP: 0018:ffffc90000167af0 EFLAGS: 00000246
RAX: dffffc0000000000 RBX: ffffc90000167bd0 RCX: 0000000000000000
RDX: 0000000000000004 RSI: ffffffff8e38edcf RDI: 0000000000000001
RBP: ffff8880b8426380 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: 1ffff9200002cf5e
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
__timer_delete_sync+0xf7/0x1c0 kernel/time/timer.c:1621
schedule_timeout+0x12f/0x280 kernel/time/sleep_timeout.c:100
rcu_gp_fqs_loop+0x1a9/0x8f0 kernel/rcu/tree.c:2122
rcu_gp_kthread+0x17a/0x220 kernel/rcu/tree.c:2330
kthread+0x373/0x450 kernel/kthread.c:436
ret_from_fork+0x730/0xd60 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: 13345 Comm: syz.2.1967 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
RIP: 0010:handle_softirqs+0x1a9/0x9d0 kernel/softirq.c:631
Code: 89 6c 24 28 4c 89 7c 24 10 48 c7 c7 60 9d ed 8b e8 1c 87 08 0a 31 d2 65 66 89 15 9e dc c2 12 e8 9d 5d 4a 00 fb bb ff ff ff ff <48> c7 c5 c0 a0 a0 8e 41 0f bc dc 83 c3 01 0f 85 9d 00 00 00 e9 b9
RSP: 0000:ffffc90005bf7e58 EFLAGS: 00000202
RAX: 00000000089b8aea RBX: 00000000ffffffff RCX: 0000000000000000
RDX: 0000000000000100 RSI: ffffffff8e38edcf RDI: ffffffff8c623a80
RBP: 1ffff92000b7efd3 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000004
R13: 000000000000000a R14: 000000010000ead9 R15: fffffbfff1d41e50
FS: 00007fef880d96c0(0000) GS:ffff888123b4e000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000056545ff6c960 CR3: 000000007d79c000 CR4: 00000000003526f0
DR0: 0000000000000004 DR1: 00000000000001f8 DR2: fffffffffffffffe
DR3: ffffffdfefffff17 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
__do_softirq kernel/softirq.c:679 [inline]
invoke_softirq kernel/softirq.c:519 [inline]
__irq_exit_rcu+0x16a/0x210 kernel/softirq.c:758
irq_exit_rcu+0x9/0x30 kernel/softirq.c:775
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline]
sysvec_apic_timer_interrupt+0x56/0xc0 arch/x86/kernel/apic/apic.c:1062
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0033:0x7fef8719e157
Code: 83 c8 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
RSP: 002b:00007fef880d90e8 EFLAGS: 00000246
RAX: 00000000000000ca RBX: 00007fef87425fa8 RCX: 00007fef8719e159
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fef87425fa8
RBP: 00007fef87425fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fef87426038 R14: 00007ffebfbc7810 R15: 00007ffebfbc78f8
sched: DL replenish lagged too much