rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P789/1:b..l P5828/1:b..l P8620/1:b..l
rcu: (detected by 1, t=10503 jiffies, g=24365, q=1108 ncpus=2)
task:syz.0.627 state:R running task stack:24312 pid:8620 tgid:8618 ppid:5828 task_flags:0x400840 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5256 [inline]
__schedule+0x1139/0x6150 kernel/sched/core.c:6863
preempt_schedule_irq+0x51/0x90 kernel/sched/core.c:7190
irqentry_exit+0x1d8/0x8c0 kernel/entry/common.c:216
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:rcu_preempt_read_exit kernel/rcu/tree_plugin.h:398 [inline]
RIP: 0010:__rcu_read_unlock+0x63/0x5a0 kernel/rcu/tree_plugin.h:435
Code: 7c 08 84 d2 0f 85 45 02 00 00 65 4c 8b 25 ad 6f 0e 12 49 8d bc 24 84 04 00 00 8b 9d 84 04 00 00 48 b8 00 00 00 00 00 fc ff df <48> 89 fa 48 c1 ea 03 83 eb 01 0f b6 14 02 48 89 f8 83 e0 07 83 c0
RSP: 0018:ffffc9000e676e58 EFLAGS: 00000246
RAX: dffffc0000000000 RBX: 0000000000000001 RCX: ffffc9000e676e44
RDX: 0000000000000000 RSI: ffffffff8daa7ea1 RDI: ffff888049438484
RBP: ffff888049438000 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: ffff888049438b30 R12: ffff888049438000
R13: ffffed102808c338 R14: dffffc0000000000 R15: ffff88814bde1800
rcu_read_unlock include/linux/rcupdate.h:899 [inline]
shrink_slab_memcg mm/shrinker.c:525 [inline]
shrink_slab+0x78a/0x12b0 mm/shrinker.c:628
shrink_node_memcgs mm/vmscan.c:6022 [inline]
shrink_node+0x918/0x3bb0 mm/vmscan.c:6061
shrink_zones mm/vmscan.c:6300 [inline]
do_try_to_free_pages+0x362/0x1920 mm/vmscan.c:6362
try_to_free_mem_cgroup_pages+0x31b/0x740 mm/vmscan.c:6690
try_charge_memcg+0x42a/0xd30 mm/memcontrol.c:2388
obj_cgroup_charge_pages mm/memcontrol.c:2823 [inline]
__memcg_kmem_charge_page+0xda/0x420 mm/memcontrol.c:2867
__alloc_frozen_pages_noprof+0x323/0x2430 mm/page_alloc.c:5227
alloc_pages_mpol+0x1fb/0x550 mm/mempolicy.c:2486
alloc_frozen_pages_noprof mm/mempolicy.c:2557 [inline]
alloc_pages_noprof+0x131/0x390 mm/mempolicy.c:2577
pagetable_alloc_noprof include/linux/mm.h:3190 [inline]
__pte_alloc_one_noprof include/asm-generic/pgalloc.h:76 [inline]
pte_alloc_one+0x1e/0x3d0 arch/x86/mm/pgtable.c:18
do_fault_around mm/memory.c:5707 [inline]
do_read_fault mm/memory.c:5746 [inline]
do_fault+0x8b8/0x1ad0 mm/memory.c:5889
do_pte_missing mm/memory.c:4401 [inline]
handle_pte_fault mm/memory.c:6273 [inline]
__handle_mm_fault+0x1919/0x2bb0 mm/memory.c:6411
handle_mm_fault+0x3fe/0xad0 mm/memory.c:6580
faultin_page mm/gup.c:1126 [inline]
__get_user_pages+0x54e/0x3590 mm/gup.c:1428
populate_vma_page_range+0x267/0x3f0 mm/gup.c:1860
__mm_populate+0x1d8/0x380 mm/gup.c:1963
mm_populate include/linux/mm.h:3701 [inline]
vm_mmap_pgoff+0x37f/0x470 mm/util.c:586
ksys_mmap_pgoff+0x7d/0x5c0 mm/mmap.c:604
__do_sys_mmap arch/x86/kernel/sys_x86_64.c:89 [inline]
__se_sys_mmap arch/x86/kernel/sys_x86_64.c:82 [inline]
__x64_sys_mmap+0x125/0x190 arch/x86/kernel/sys_x86_64.c:82
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f765e18f749
RSP: 002b:00007f765ef81038 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007f765e3e6090 RCX: 00007f765e18f749
RDX: b635773f06ebbeee RSI: 0000000000b36000 RDI: 0000200000000000
RBP: 00007f765e213f91 R08: ffffffffffffffff R09: 0000000000000000
R10: 0000000000008031 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f765e3e6128 R14: 00007f765e3e6090 R15: 00007ffc3f613ce8
task:syz-executor state:R running task stack:23640 pid:5828 tgid:5828 ppid:1 task_flags:0x400940 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5256 [inline]
__schedule+0x1139/0x6150 kernel/sched/core.c:6863
preempt_schedule_irq+0x51/0x90 kernel/sched/core.c:7190
irqentry_exit+0x1d8/0x8c0 kernel/entry/common.c:216
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:lock_acquire+0x62/0x330 kernel/locking/lockdep.c:5872
Code: b4 18 12 83 f8 07 0f 87 a2 02 00 00 89 c0 48 0f a3 05 72 b9 ee 0e 0f 82 74 02 00 00 8b 35 0a ea ee 0e 85 f6 0f 85 8d 00 00 00 <48> 8b 44 24 30 65 48 2b 05 89 b4 18 12 0f 85 ad 02 00 00 48 83 c4
RSP: 0018:ffffc900033669b8 EFLAGS: 00000206
RAX: 0000000000000046 RBX: ffffffff8e3c96a0 RCX: 0000000013d622c6
RDX: 0000000000000000 RSI: ffffffff8daa7ea1 RDI: ffffffff8bf2b400
RBP: 0000000000000002 R08: 00000000accd7842 R09: 000000002accd784
R10: 0000000000000002 R11: ffff8880266cd4b0 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
rcu_read_lock include/linux/rcupdate.h:867 [inline]
shrink_slab_memcg mm/shrinker.c:536 [inline]
shrink_slab+0x897/0x12b0 mm/shrinker.c:628
shrink_node_memcgs mm/vmscan.c:6022 [inline]
shrink_node+0x918/0x3bb0 mm/vmscan.c:6061
shrink_zones mm/vmscan.c:6300 [inline]
do_try_to_free_pages+0x362/0x1920 mm/vmscan.c:6362
try_to_free_mem_cgroup_pages+0x31b/0x740 mm/vmscan.c:6690
try_charge_memcg+0x42a/0xd30 mm/memcontrol.c:2388
try_charge mm/memcontrol.c:2530 [inline]
charge_memcg+0x8a/0x230 mm/memcontrol.c:4728
mem_cgroup_swapin_charge_folio+0xeb/0x470 mm/memcontrol.c:4814
__read_swap_cache_async+0x397/0x500 mm/swap_state.c:481
swap_cluster_readahead+0x432/0x770 mm/swap_state.c:646
swapin_readahead+0x160/0x1220 mm/swap_state.c:821
do_swap_page+0x962/0x64a0 mm/memory.c:4753
handle_pte_fault mm/memory.c:6276 [inline]
__handle_mm_fault+0x19cb/0x2bb0 mm/memory.c:6411
handle_mm_fault+0x3fe/0xad0 mm/memory.c:6580
do_user_addr_fault+0x7a6/0x1370 arch/x86/mm/fault.c:1387
handle_page_fault arch/x86/mm/fault.c:1476 [inline]
exc_page_fault+0x64/0xc0 arch/x86/mm/fault.c:1532
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618
RIP: 0010:rep_stos_alternative+0x40/0x80 arch/x86/lib/clear_page_64.S:99
Code: c9 75 f6 e9 d2 8d 04 00 48 89 07 48 83 c7 08 83 e9 08 74 ef 83 f9 08 73 ef eb de 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 <48> 89 07 48 89 47 08 48 89 47 10 48 89 47 18 48 89 47 20 48 89 47
RSP: 0018:ffffc90003367ad8 EFLAGS: 00050246
RAX: 0000000000000000 RBX: 0000000000000040 RCX: 0000000000000040
RDX: ffff8880266cc980 RSI: ffffffff8162ad8e RDI: 00007ffc3f6136c0
RBP: 0000000000000000 R08: 00000000ffffffff R09: 00000000ffffffff
R10: 0000000000000001 R11: ffff8880266cd4b0 R12: 00007ffc3f6134c0
R13: ffff8880266ce380 R14: 00007ffc3f6134c0 R15: 00007ffffffff000
__clear_user arch/x86/include/asm/uaccess_64.h:188 [inline]
copy_fpstate_to_sigframe+0x178/0xad0 arch/x86/kernel/fpu/signal.c:203
get_sigframe+0x4a8/0x9c0 arch/x86/kernel/signal.c:163
x64_setup_rt_frame+0x129/0xcf0 arch/x86/kernel/signal_64.c:175
setup_rt_frame arch/x86/kernel/signal.c:250 [inline]
handle_signal arch/x86/kernel/signal.c:294 [inline]
arch_do_signal_or_restart+0x5da/0x7e0 arch/x86/kernel/signal.c:339
__exit_to_user_mode_loop kernel/entry/common.c:41 [inline]
exit_to_user_mode_loop+0x8c/0x540 kernel/entry/common.c:75
__exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]
syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline]
syscall_exit_to_user_mode_work include/linux/entry-common.h:159 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:194 [inline]
do_syscall_64+0x4ee/0xf80 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f765e1c2005
RSP: 002b:00007ffc3f614000 EFLAGS: 00000293 ORIG_RAX: 00000000000000e6
RAX: 0000000000000000 RBX: 00000000000001de RCX: 00007f765e1c2005
RDX: 00007ffc3f614040 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007ffc3f6140ac R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000001388
R13: 00000000000927c0 R14: 000000000003eeeb R15: 00007ffc3f614100
task:kworker/0:2 state:R running task stack:24904 pid:789 tgid:789 ppid:2 task_flags:0x4208060 flags:0x00080000
Workqueue: events_power_efficient gc_worker
Call Trace:
context_switch kernel/sched/core.c:5256 [inline]
__schedule+0x1139/0x6150 kernel/sched/core.c:6863
preempt_schedule_irq+0x51/0x90 kernel/sched/core.c:7190
irqentry_exit+0x1d8/0x8c0 kernel/entry/common.c:216
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:__seqprop_spinlock_sequence include/linux/seqlock.h:227 [inline]
RIP: 0010:nf_conntrack_get_ht include/net/netfilter/nf_conntrack.h:342 [inline]
RIP: 0010:gc_worker+0x2d5/0x16e0 net/netfilter/nf_conntrack_core.c:1548
Code: 00 00 48 c7 c7 a8 61 89 90 e8 37 ee 05 f8 9c 5b 81 e3 00 02 00 00 31 ff 48 89 de e8 c5 da 2a f8 58 48 85 db 0f 85 d4 0f 00 00 e6 df 2a f8 8b 1d 10 5b f5 06 41 89 dc 31 ff 41 83 e4 01 44 89
RSP: 0018:ffffc90003637ad8 EFLAGS: 00000293
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff899411c9
RDX: ffff888025bfa4c0 RSI: ffffffff899411d8 RDI: 0000000000000007
RBP: ffffffff9b0a38ac R08: 0000000000000007 R09: 0000000000000000
R10: 0000000000000000 R11: ffff888025bfaff0 R12: ffff888025200000
R13: 0000000000040000 R14: dffffc0000000000 R15: 0000000000001945
process_one_work+0x9ba/0x1b20 kernel/workqueue.c:3257
process_scheduled_works kernel/workqueue.c:3340 [inline]
worker_thread+0x6c8/0xf10 kernel/workqueue.c:3421
kthread+0x3c5/0x780 kernel/kthread.c:463
ret_from_fork+0x983/0xb10 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
rcu: rcu_preempt kthread starved for 10649 jiffies! g24365 f0x0 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:28424 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5256 [inline]
__schedule+0x1139/0x6150 kernel/sched/core.c:6863
__schedule_loop kernel/sched/core.c:6945 [inline]
schedule+0xe7/0x3a0 kernel/sched/core.c:6960
schedule_timeout+0x123/0x290 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x1ea/0xaf0 kernel/rcu/tree.c:2083
rcu_gp_kthread+0x26d/0x380 kernel/rcu/tree.c:2285
kthread+0x3c5/0x780 kernel/kthread.c:463
ret_from_fork+0x983/0xb10 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
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: 8634 Comm: syz.0.627 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:check_kcov_mode kernel/kcov.c:183 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x31/0x70 kernel/kcov.c:217
Code: 24 65 48 8b 15 98 c9 f3 11 65 8b 05 a9 c9 f3 11 a9 00 01 ff 00 74 1d f6 c4 01 74 43 a9 00 00 0f 00 75 3c a9 00 00 f0 00 75 35 <8b> 82 6c 16 00 00 85 c0 74 2b 8b 82 48 16 00 00 83 f8 02 75 20 48
RSP: 0018:ffffc90000007b70 EFLAGS: 00000246
RAX: 0000000080000101 RBX: ffffc9001d128990 RCX: ffffffff897edf4d
RDX: ffff88804e1aa4c0 RSI: ffffffff897edf57 RDI: 0000000000000007
RBP: ffff8880785fdac0 R08: 0000000000000007 R09: 0000000000000000
R10: 0000000000000000 R11: ffff88804e1aaff0 R12: 0000000000000000
R13: 0000000000000000 R14: fffffff0a3da8872 R15: 0000000000000000
FS: 00007f765ef606c0(0000) GS:ffff8881248f5000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9f2e9e7dac CR3: 000000003f6f2000 CR4: 00000000003526f0
Call Trace:
pie_calculate_probability+0x397/0x850 net/sched/sch_pie.c:402
fq_pie_timer+0x21e/0x5b0 net/sched/sch_fq_pie.c:402
call_timer_fn+0x19a/0x5a0 kernel/time/timer.c:1748
expire_timers kernel/time/timer.c:1799 [inline]
__run_timers+0x74a/0xae0 kernel/time/timer.c:2373
__run_timer_base kernel/time/timer.c:2385 [inline]
__run_timer_base kernel/time/timer.c:2377 [inline]
run_timer_base+0x114/0x190 kernel/time/timer.c:2394
run_timer_softirq+0x1a/0x40 kernel/time/timer.c:2404
handle_softirqs+0x219/0x950 kernel/softirq.c:622
__do_softirq kernel/softirq.c:656 [inline]
invoke_softirq kernel/softirq.c:496 [inline]
__irq_exit_rcu+0x109/0x170 kernel/softirq.c:723
irq_exit_rcu+0x9/0x30 kernel/softirq.c:739
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline]
sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1056
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:get_current arch/x86/include/asm/current.h:25 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x8/0x70 kernel/kcov.c:216
Code: e9 4d 1b 5e 00 be 03 00 00 00 5b e9 72 df ed 02 66 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 48 8b 34 24 <65> 48 8b 15 98 c9 f3 11 65 8b 05 a9 c9 f3 11 a9 00 01 ff 00 74 1d
RSP: 0018:ffffc9000e736440 EFLAGS: 00000202
RAX: 0000000000000000 RBX: 0000000000000001 RCX: ffffffff8201d05a
RDX: ffff88804e1aa4c0 RSI: ffffffff8201cdd7 RDI: 0000000000000001
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: ffff88804e1aaff0 R12: 0000000000000000
R13: 0000000000000001 R14: ffff88801cb13b00 R15: ffff888034be8000
trace_mm_shrink_slab_end include/trace/events/vmscan.h:244 [inline]
do_shrink_slab+0x637/0x1130 mm/shrinker.c:464
shrink_slab_memcg mm/shrinker.c:550 [inline]
shrink_slab+0xa1f/0x12b0 mm/shrinker.c:628
shrink_node_memcgs mm/vmscan.c:6022 [inline]
shrink_node+0x918/0x3bb0 mm/vmscan.c:6061
shrink_zones mm/vmscan.c:6300 [inline]
do_try_to_free_pages+0x362/0x1920 mm/vmscan.c:6362
try_to_free_mem_cgroup_pages+0x31b/0x740 mm/vmscan.c:6690
try_charge_memcg+0x42a/0xd30 mm/memcontrol.c:2388
try_charge mm/memcontrol.c:2530 [inline]
charge_memcg+0x8a/0x230 mm/memcontrol.c:4728
__mem_cgroup_charge+0x2b/0x1e0 mm/memcontrol.c:4745
mem_cgroup_charge include/linux/memcontrol.h:663 [inline]
shmem_alloc_and_add_folio+0x50c/0xc20 mm/shmem.c:1942
shmem_get_folio_gfp+0x67f/0x1610 mm/shmem.c:2556
shmem_get_folio mm/shmem.c:2662 [inline]
shmem_write_begin+0x1a4/0x3b0 mm/shmem.c:3315
generic_perform_write+0x3c4/0x900 mm/filemap.c:4314
shmem_file_write_iter+0x10e/0x140 mm/shmem.c:3490
__kernel_write_iter+0x31a/0xb10 fs/read_write.c:619
dump_emit_page fs/coredump.c:1298 [inline]
dump_user_range+0x413/0xb70 fs/coredump.c:1372
elf_core_dump+0x29c3/0x3c10 fs/binfmt_elf.c:2111
coredump_write fs/coredump.c:1049 [inline]
do_coredump fs/coredump.c:1126 [inline]
vfs_coredump+0x2b85/0x55e0 fs/coredump.c:1200
get_signal+0x22e1/0x26d0 kernel/signal.c:3019
arch_do_signal_or_restart+0x8f/0x7e0 arch/x86/kernel/signal.c:337
__exit_to_user_mode_loop kernel/entry/common.c:41 [inline]
exit_to_user_mode_loop kernel/entry/common.c:75 [inline]
__exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]
irqentry_exit_to_user_mode_prepare include/linux/irq-entry-common.h:270 [inline]
irqentry_exit_to_user_mode include/linux/irq-entry-common.h:339 [inline]
irqentry_exit+0x38a/0x8c0 kernel/entry/common.c:196
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618
RIP: 0033:0x7f765e18f751
Code: 00 00 00 00 00 0f 1f 40 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 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f
RSP: 002b:fffffffffffffe70 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007f765e3e6180 RCX: 00007f765e18f749
RDX: 0000000000000000 RSI: fffffffffffffe70 RDI: 0000000000008000
RBP: 00007f765e213f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 00007f765e3e6218 R14: 00007f765e3e6180 R15: 00007ffc3f613ce8