rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 0-...!: (1 GPs behind) idle=d6e4/1/0x4000000000000000 softirq=45999/46000 fqs=0
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P9979/1:b..l P9984/1:b..l
(detected by 1, t=10505 jiffies, g=68237, q=34 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 9983 Comm: syz.7.1218 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
RIP: 0010:debug_spin_unlock kernel/locking/spinlock_debug.c:102 [inline]
RIP: 0010:do_raw_spin_unlock+0xb5/0x230 kernel/locking/spinlock_debug.c:140
Code: 06 0f 85 d9 00 00 00 4c 8d 7b 08 4c 89 fd 48 c1 ed 03 42 0f b6 44 25 00 84 c0 0f 85 3d 01 00 00 41 8b 07 65 8b 0d 0b 80 9c 7e <39> c8 0f 85 cf 00 00 00 43 80 7c 25 00 00 74 08 4c 89 f7 e8 c3 f9
RSP: 0018:ffffc90000007c58 EFLAGS: 00000046
RAX: 0000000000000000 RBX: ffff88807b9882e8 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff88807b9882e8
RBP: 1ffff1100f73105e R08: ffff88807b9882eb R09: 1ffff1100f73105d
R10: dffffc0000000000 R11: ffffed100f73105e R12: dffffc0000000000
R13: 1ffff1100f73105f R14: ffff88807b9882f8 R15: ffff88807b9882f0
FS: 00007fc827bf66c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6237c440a0 CR3: 000000001ea9e000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
__raw_spin_unlock include/linux/spinlock_api_smp.h:142 [inline]
_raw_spin_unlock+0x1a/0x40 kernel/locking/spinlock.c:186
spin_unlock include/linux/spinlock.h:391 [inline]
advance_sched+0x687/0x970 net/sched/sch_taprio.c:749
__run_hrtimer kernel/time/hrtimer.c:1747 [inline]
__hrtimer_run_queues+0x54a/0xd50 kernel/time/hrtimer.c:1811
hrtimer_interrupt+0x3c5/0x9c0 kernel/time/hrtimer.c:1873
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1107 [inline]
__sysvec_apic_timer_interrupt+0x153/0x5a0 arch/x86/kernel/apic/apic.c:1124
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline]
sysvec_apic_timer_interrupt+0x9b/0xc0 arch/x86/kernel/apic/apic.c:1118
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:generic_exec_single+0x431/0x4a0 kernel/smp.c:545
Code: 75 11 e8 d2 05 0b 00 48 85 db 75 16 e8 c8 05 0b 00 eb 15 e8 c1 05 0b 00 e8 dc 14 b7 08 48 85 db 74 ea e8 b2 05 0b 00 fb 31 c0 <48> c7 44 24 20 0e 36 e0 45 4b c7 44 25 00 00 00 00 00 43 c7 44 25
RSP: 0018:ffffc9000c7979a0 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000000000200 RCX: 0000000000080000
RDX: ffffc90011634000 RSI: 000000000002ae95 RDI: 000000000002ae96
RBP: ffffc9000c797a78 R08: ffffc9000c797b6b R09: 1ffff920018f2f6d
R10: dffffc0000000000 R11: fffff520018f2f6e R12: dffffc0000000000
R13: 1ffff920018f2f38 R14: 0000000000000000 R15: 1ffff920018f2f61
smp_call_function_single_async+0x71/0x100 kernel/smp.c:832
rdmsr_safe_on_cpu+0x14d/0x290 arch/x86/lib/msr-smp.c:181
msr_read+0x10d/0x1b0 arch/x86/kernel/msr.c:67
vfs_read+0x2de/0xa00 fs/read_write.c:468
ksys_read+0x14c/0x250 fs/read_write.c:613
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fc82999ce59
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:00007fc827bf6028 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 00007fc829c16090 RCX: 00007fc82999ce59
RDX: 0000000000018ff8 RSI: 0000200000019680 RDI: 0000000000000005
RBP: 00007fc829a32d6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fc829c16128 R14: 00007fc829c16090 R15: 00007ffe1b17a008
task:modprobe state:R running task stack:24336 pid:9984 ppid:9503 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5245 [inline]
__schedule+0x11d1/0x40e0 kernel/sched/core.c:6562
preempt_schedule_irq+0xbb/0x160 kernel/sched/core.c:6874
irqentry_exit+0x63/0x70 kernel/entry/common.c:439
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:get_current arch/x86/include/asm/current.h:15 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x4/0x60 kernel/kcov.c:215
Code: 00 00 00 00 00 90 53 48 89 fb e8 17 00 00 00 48 8b 3d b0 87 9d 0c 48 89 de 5b e9 b7 42 50 00 00 00 cc cc 00 00 cc 48 8b 04 24 <65> 48 8b 0d 84 e8 7f 7e 65 8b 15 85 e8 7f 7e 81 e2 00 01 ff 00 74
RSP: 0018:ffffc9000c7d73d8 EFLAGS: 00000293
RAX: ffffffff8a1c1cd4 RBX: ffff888077638200 RCX: 0000000000000005
RDX: ffffffff8a1c1a5e RSI: ffffffff8e08ea90 RDI: 0000000000000001
RBP: ffffc9000c7d7590 R08: ffff88802e870000 R09: 0000000000000004
R10: 0000000000000003 R11: 0000000000000000 R12: dffffc0000000000
R13: 000000000000000f R14: 0000000000000001 R15: 000000000000000f
ma_pivots lib/maple_tree.c:632 [inline]
mas_validate_gaps lib/maple_tree.c:6957 [inline]
mt_validate+0x2994/0x4cb0 lib/maple_tree.c:7246
validate_mm_mt+0xe2/0x440 mm/mmap.c:295
validate_mm+0xe1/0x2e0 mm/mmap.c:332
remove_mt mm/mmap.c:2322 [inline]
do_mas_align_munmap+0x1000/0x12b0 mm/mmap.c:2595
do_mas_munmap+0x240/0x2b0 mm/mmap.c:2650
__mmap_region mm/mmap.c:2698 [inline]
mmap_region+0x6e0/0x1ca0 mm/mmap.c:2916
do_mmap+0x964/0xfd0 mm/mmap.c:1436
vm_mmap_pgoff+0x1c1/0x2d0 mm/util.c:520
ksys_mmap_pgoff+0x516/0x6f0 mm/mmap.c:1482
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f1c3d730242
RSP: 002b:00007ffd4ccd34b8 EFLAGS: 00000206 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007f1c3d492000 RCX: 00007f1c3d730242
RDX: 0000000000000005 RSI: 000000000014e000 RDI: 00007f1c3d492000
RBP: 0000000000000812 R08: 0000000000000000 R09: 0000000000028000
R10: 0000000000000812 R11: 0000000000000206 R12: 00007ffd4ccd3508
R13: 00007f1c3d70c5f0 R14: 00007ffd4ccd3cf0 R15: 00000fffa999a69a
task:rm state:R running task stack:23568 pid:9979 ppid:9920 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5245 [inline]
__schedule+0x11d1/0x40e0 kernel/sched/core.c:6562
preempt_schedule_irq+0xbb/0x160 kernel/sched/core.c:6874
irqentry_exit+0x63/0x70 kernel/entry/common.c:439
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:bpf_ksym_find kernel/bpf/core.c:703 [inline]
RIP: 0010:is_bpf_text_address+0x264/0x2a0 kernel/bpf/core.c:736
Code: ff eb 24 e8 ae 5e f3 ff c6 05 d7 5c 7c 0c 01 48 c7 c7 c0 05 92 8a be 35 03 00 00 48 c7 c2 60 06 92 8a e8 5f d7 d5 ff 48 85 db <0f> 95 c0 48 81 fb 20 02 00 00 40 0f 95 c5 40 20 c5 e8 46 23 de ff
RSP: 0018:ffffc9000c7b7170 EFLAGS: 00000246
RAX: ffffffff818f27c9 RBX: 0000000000000000 RCX: ffff88802c5c0000
RDX: 0000000000000000 RSI: ffffffff8adf1b40 RDI: ffffffff8adf1b00
RBP: 0000000000000001 R08: dffffc0000000000 R09: 1ffffffff215fa48
R10: dffffc0000000000 R11: fffffbfff215fa49 R12: 0000000000000152
R13: dffffc0000000000 R14: 00007f6237f25242 R15: 0000000000000000
kernel_text_address+0x9c/0xd0 kernel/extable.c:125
__kernel_text_address+0x9/0x30 kernel/extable.c:79
unwind_get_return_address+0x49/0x80 arch/x86/kernel/unwind_orc.c:323
arch_stack_walk+0xf2/0x140 arch/x86/kernel/stacktrace.c:26
stack_trace_save+0xa6/0xf0 kernel/stacktrace.c:122
kasan_save_stack mm/kasan/common.c:46 [inline]
kasan_set_track+0x4b/0x70 mm/kasan/common.c:53
kasan_save_free_info+0x2d/0x50 mm/kasan/generic.c:516
____kasan_slab_free+0x126/0x1e0 mm/kasan/common.c:237
kasan_slab_free include/linux/kasan.h:177 [inline]
slab_free_hook mm/slub.c:1729 [inline]
slab_free_freelist_hook+0x131/0x1a0 mm/slub.c:1755
slab_free mm/slub.c:3687 [inline]
kmem_cache_free_bulk+0x348/0x460 mm/slub.c:3805
mt_free_bulk lib/maple_tree.c:164 [inline]
mas_destroy+0x2560/0x2d90 lib/maple_tree.c:5864
mas_store_prealloc+0x33a/0x440 lib/maple_tree.c:5792
__mmap_region mm/mmap.c:2831 [inline]
mmap_region+0x1409/0x1ca0 mm/mmap.c:2916
do_mmap+0x964/0xfd0 mm/mmap.c:1436
vm_mmap_pgoff+0x1c1/0x2d0 mm/util.c:520
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f6237f25242
RSP: 002b:00007ffd2757d2f8 EFLAGS: 00000206 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007f6237c45000 RCX: 00007f6237f25242
RDX: 0000000000000003 RSI: 0000000000001888 RDI: 00007f6237c45000
RBP: 0000000000000032 R08: 00000000ffffffff R09: 0000000000000000
R10: 0000000000000032 R11: 0000000000000206 R12: 00007ffd2757d3b8
R13: 00007f6237f02580 R14: 00007ffd2757d770 R15: 00007f6237c45000
rcu: rcu_preempt kthread starved for 10505 jiffies! g68237 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1
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:27408 pid:16 ppid:2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5245 [inline]
__schedule+0x11d1/0x40e0 kernel/sched/core.c:6562
schedule+0xb9/0x180 kernel/sched/core.c:6638
schedule_timeout+0x184/0x2d0 kernel/time/timer.c:2168
rcu_gp_fqs_loop+0x303/0x1340 kernel/rcu/tree.c:1706
rcu_gp_kthread+0x99/0x3b0 kernel/rcu/tree.c:1905
kthread+0x29d/0x330 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
rcu: Stack dump where RCU GP kthread last ran:
CPU: 1 PID: 0 Comm: swapper/1 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
RIP: 0010:default_idle+0xb/0x10 arch/x86/kernel/process.c:742
Code: 48 89 df e8 97 04 9b f7 e9 44 ff ff ff e8 fd 06 f6 ff 00 00 cc cc 00 00 cc cc 00 00 cc cc 00 66 90 0f 00 2d 67 1a 4e 00 fb f4 0f 1f 40 00 41 57 41 56 53 49 be 00 00 00 00 00 fc ff df 65 48
RSP: 0018:ffffc90000177de8 EFLAGS: 000002c6
RAX: 6d7d0238c2590800 RBX: ffffffff8a389347 RCX: 6d7d0238c2590800
RDX: 0000000000000001 RSI: ffffffff8a8c19a0 RDI: ffffffff8adf1b60
RBP: ffffc90000177f20 R08: ffff8880b8f3580b R09: 1ffff110171e6b01
R10: dffffc0000000000 R11: ffffed10171e6b02 R12: 0000000000000000
R13: dffffc0000000000 R14: ffff88813fef1dc0 R15: 1ffff9200002efc8
FS: 0000000000000000(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c310111 CR3: 000000001ea9e000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
default_idle_call+0x84/0xc0 kernel/sched/idle.c:109
cpuidle_idle_call kernel/sched/idle.c:199 [inline]
do_idle+0x250/0x680 kernel/sched/idle.c:323
cpu_startup_entry+0x3f/0x60 kernel/sched/idle.c:422
start_secondary+0xe4/0xf0 arch/x86/kernel/smpboot.c:281
secondary_startup_64_no_verify+0xcf/0xdb