rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 0-...!: (1 GPs behind) idle=d924/1/0x4000000000000000 softirq=30370/30382 fqs=2
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P8049/1:b..l P8380/1:b..l
rcu: (detected by 1, t=10502 jiffies, g=25285, q=353 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 8382 Comm: syz.6.879 Not tainted 6.15.0-rc2-syzkaller-00087-gcfb2e2c57aef #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:advance_sched+0x2b/0xca0 net/sched/sch_taprio.c:916
Code: 0f 1e fa 55 41 57 41 56 41 55 41 54 53 48 81 ec 98 00 00 00 49 89 fe 48 bd 00 00 00 00 00 fc ff df e8 79 4d 9c f7 49 8d 5e 88 <48> 89 d8 48 c1 e8 03 80 3c 28 00 74 08 48 89 df e8 f0 8d 06 f8 48
RSP: 0018:ffffc90000007c70 EFLAGS: 00000006
RAX: ffffffff8a2707b7 RBX: ffff888034a922c8 RCX: ffff88801f75da00
RDX: 0000000000010000 RSI: 0000000000000000 RDI: ffff888034a92340
RBP: dffffc0000000000 R08: ffffffff81b099fa R09: 1ffffffff20bfc4e
R10: dffffc0000000000 R11: ffffffff8a270790 R12: dffffc0000000000
R13: ffffffff8a270790 R14: ffff888034a92340 R15: ffff88801f75e4d8
FS: 00007f168bfe76c0(0000) GS:ffff888124f93000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2c81fffc CR3: 000000004d5e4000 CR4: 0000000000350ef0
Call Trace:
__run_hrtimer kernel/time/hrtimer.c:1761 [inline]
__hrtimer_run_queues+0x5a8/0xd40 kernel/time/hrtimer.c:1825
hrtimer_interrupt+0x403/0xa40 kernel/time/hrtimer.c:1887
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1038 [inline]
__sysvec_apic_timer_interrupt+0x112/0x420 arch/x86/kernel/apic/apic.c:1055
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1049
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:is_folio_zero_filled mm/page_io.c:193 [inline]
RIP: 0010:swap_writepage+0x214/0xd00 mm/page_io.c:266
Code: c1 e8 03 48 b9 00 00 00 00 00 fc ff df 80 3c 08 00 74 05 e8 ee d3 09 00 4b 8b 5c 37 e8 31 ff 48 89 de e8 2f 98 9f ff 48 85 db <0f> 85 39 01 00 00 4b 8d 3c 34 48 83 c7 08 48 89 f8 48 c1 e8 03 48
RSP: 0018:ffffc900034fe828 EFLAGS: 00000246
RAX: 0000000000000002 RBX: 0000000000000000 RCX: ffff88801f75da00
RDX: ffffc9000e409000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 000000000000016b R08: ffffffff8223c1e1 R09: 1ffffd40002c2a58
R10: dffffc0000000000 R11: fffff940002c2a59 R12: ffff88805854b000
R13: ffffea00016152c0 R14: 0000000000000b40 R15: ffff88805854b018
pageout mm/vmscan.c:711 [inline]
shrink_folio_list+0x3a0d/0x5e80 mm/vmscan.c:1436
reclaim_folio_list+0x13e/0x600 mm/vmscan.c:2217
reclaim_pages+0x4a7/0x5f0 mm/vmscan.c:2254
madvise_cold_or_pageout_pte_range+0x1eb5/0x2350 mm/madvise.c:558
walk_pmd_range mm/pagewalk.c:130 [inline]
walk_pud_range mm/pagewalk.c:226 [inline]
walk_p4d_range mm/pagewalk.c:264 [inline]
walk_pgd_range+0xc41/0x17e0 mm/pagewalk.c:305
__walk_page_range+0x15f/0x700 mm/pagewalk.c:412
walk_page_range_mm+0x591/0x7c0 mm/pagewalk.c:505
madvise_pageout_page_range mm/madvise.c:617 [inline]
madvise_pageout mm/madvise.c:644 [inline]
madvise_vma_behavior mm/madvise.c:1269 [inline]
madvise_walk_vmas mm/madvise.c:1530 [inline]
madvise_do_behavior+0x3444/0x4640 mm/madvise.c:1695
do_madvise mm/madvise.c:1782 [inline]
__do_sys_madvise mm/madvise.c:1790 [inline]
__se_sys_madvise mm/madvise.c:1788 [inline]
__x64_sys_madvise+0x185/0x220 mm/madvise.c:1788
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f168b18e169
Code: ff ff c3 66 2e 0f 1f 84 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 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f168bfe7038 EFLAGS: 00000246 ORIG_RAX: 000000000000001c
RAX: ffffffffffffffda RBX: 00007f168b3b6080 RCX: 00007f168b18e169
RDX: 0000000000000015 RSI: 0000000000600000 RDI: 0000200000000000
RBP: 00007f168b210a68 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000001 R14: 00007f168b3b6080 R15: 00007fff7a36acc8
task:syz.8.881 state:R running task stack:26728 pid:8380 tgid:8380 ppid:7660 task_flags:0x40004c flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5382 [inline]
__schedule+0x1b88/0x5240 kernel/sched/core.c:6767
preempt_schedule_irq+0xfe/0x1c0 kernel/sched/core.c:7090
irqentry_exit+0x5e/0x90 kernel/entry/common.c:354
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:rcu_read_unlock include/linux/rcupdate.h:869 [inline]
RIP: 0010:class_rcu_destructor include/linux/rcupdate.h:1155 [inline]
RIP: 0010:unwind_next_frame+0x1a5d/0x23b0 arch/x86/kernel/unwind_orc.c:680
Code: 44 24 28 42 0f b6 04 28 84 c0 0f 85 7d 01 00 00 41 c7 04 24 00 00 00 00 31 ed e8 8e c3 c2 0a 85 c0 74 3a e8 e5 9e 3a 00 84 c0 <75> 31 e8 7c c3 c2 0a 85 c0 74 28 80 3d 5e 92 db 0e 00 75 1f c6 05
RSP: 0018:ffffc90003d072c8 EFLAGS: 00000202
RAX: 0000000000000001 RBX: ffffc90003d07400 RCX: ffff88807ebbda00
RDX: dffffc0000000000 RSI: ffffffff8ca1b740 RDI: ffffffff8ca1b700
RBP: dffffc0000000001 R08: ffffc90003d073f0 R09: ffffc90003d07450
R10: dffffc0000000000 R11: fffff520007a0e8c R12: ffffc90003d07410
R13: dffffc0000000000 R14: ffffc90003d07400 R15: ffffffff816dfbc8
__unwind_start+0x59a/0x740 arch/x86/kernel/unwind_orc.c:758
unwind_start arch/x86/include/asm/unwind.h:64 [inline]
arch_stack_walk+0xe7/0x150 arch/x86/kernel/stacktrace.c:24
stack_trace_save+0x11a/0x1d0 kernel/stacktrace.c:122
kasan_save_stack mm/kasan/common.c:47 [inline]
kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:576
poison_slab_object mm/kasan/common.c:247 [inline]
__kasan_slab_free+0x59/0x70 mm/kasan/common.c:264
kasan_slab_free include/linux/kasan.h:233 [inline]
slab_free_hook mm/slub.c:2389 [inline]
slab_free mm/slub.c:4646 [inline]
kmem_cache_free+0x197/0x410 mm/slub.c:4748
anon_vma_chain_free mm/rmap.c:147 [inline]
unlink_anon_vmas+0x297/0x5f0 mm/rmap.c:421
free_pgtables+0x219/0x6f0 mm/memory.c:370
exit_mmap+0x5a9/0xde0 mm/mmap.c:1295
__mmput+0x115/0x420 kernel/fork.c:1379
exit_mm+0x221/0x310 kernel/exit.c:589
do_exit+0x994/0x27f0 kernel/exit.c:940
do_group_exit+0x207/0x2c0 kernel/exit.c:1102
__do_sys_exit_group kernel/exit.c:1113 [inline]
__se_sys_exit_group kernel/exit.c:1111 [inline]
__x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1111
x64_sys_call+0x26c3/0x26d0 arch/x86/include/generated/asm/syscalls_64.h:232
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f868d98e169
RSP: 002b:00007ffefb10c278 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f868d98e169
RDX: 0000000000000064 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007ffefb10c2dc R08: 00000004fb10c36f R09: 00000000000927c0
R10: 0000000000000001 R11: 0000000000000246 R12: 0000000000000023
R13: 00000000000927c0 R14: 0000000000032ec4 R15: 00007ffefb10c330
task:syz-executor state:R running task stack:19480 pid:8049 tgid:8049 ppid:8033 task_flags:0x400140 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5382 [inline]
__schedule+0x1b88/0x5240 kernel/sched/core.c:6767
preempt_schedule_common+0x84/0xd0 kernel/sched/core.c:6947
preempt_schedule+0xe4/0xf0 kernel/sched/core.c:6971
preempt_schedule_thunk+0x16/0x30 arch/x86/entry/thunk.S:12
__raw_spin_unlock include/linux/spinlock_api_smp.h:143 [inline]
_raw_spin_unlock+0x3e/0x50 kernel/locking/spinlock.c:186
spin_unlock include/linux/spinlock.h:391 [inline]
copy_pte_range+0x5e5f/0x6680 mm/memory.c:1194
copy_pmd_range mm/memory.c:1255 [inline]
copy_pud_range mm/memory.c:1292 [inline]
copy_p4d_range mm/memory.c:1316 [inline]
copy_page_range+0xe57/0x13a0 mm/memory.c:1410
dup_mmap kernel/fork.c:726 [inline]
dup_mm kernel/fork.c:1734 [inline]
copy_mm+0x130d/0x22c0 kernel/fork.c:1786
copy_process+0x17de/0x3d10 kernel/fork.c:2429
kernel_clone+0x242/0x930 kernel/fork.c:2844
__do_sys_clone kernel/fork.c:2987 [inline]
__se_sys_clone kernel/fork.c:2971 [inline]
__x64_sys_clone+0x268/0x2e0 kernel/fork.c:2971
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f165db849d3
RSP: 002b:00007ffd64de21f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f165db849d3
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000001
R10: 00005555609787d0 R11: 0000000000000246 R12: 0000000000000000
R13: 00000000000927c0 R14: 000000000003313f R15: 00007ffd64de2390
rcu: rcu_preempt kthread starved for 10498 jiffies! g25285 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:26376 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5382 [inline]
__schedule+0x1b88/0x5240 kernel/sched/core.c:6767
__schedule_loop kernel/sched/core.c:6845 [inline]
schedule+0x163/0x360 kernel/sched/core.c:6860
schedule_timeout+0x15b/0x2b0 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x2e1/0x1340 kernel/rcu/tree.c:2046
rcu_gp_kthread+0xa7/0x3b0 kernel/rcu/tree.c:2248
kthread+0x7b9/0x940 kernel/kthread.c:464
ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
rcu: Stack dump where RCU GP kthread last ran:
CPU: 1 UID: 0 PID: 13 Comm: kworker/u8:1 Not tainted 6.15.0-rc2-syzkaller-00087-gcfb2e2c57aef #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Workqueue: events_unbound toggle_allocation_gate
RIP: 0010:csd_lock_wait kernel/smp.c:340 [inline]
RIP: 0010:smp_call_function_many_cond+0x1bb6/0x2d40 kernel/smp.c:885
Code: 89 e6 83 e6 01 31 ff e8 18 e3 0b 00 41 83 e4 01 4c 8b 64 24 68 75 07 e8 c8 de 0b 00 eb 41 f3 90 48 b8 00 00 00 00 00 fc ff df <0f> b6 04 03 84 c0 75 11 41 f7 45 00 01 00 00 00 74 1e e8 a3 de 0b
RSP: 0018:ffffc90000127640 EFLAGS: 00000293
RAX: dffffc0000000000 RBX: 1ffff110170c823d RCX: ffff88801c680000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc90000127840 R08: ffffffff81b77658 R09: 1ffffffff20bfc4e
R10: dffffc0000000000 R11: fffffbfff20bfc4f R12: ffff8880b873ad08
R13: ffff8880b86411e8 R14: ffff8880b873ad00 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff888125093000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f868c473000 CR3: 000000000eb38000 CR4: 0000000000350ef0
Call Trace:
on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1052
on_each_cpu include/linux/smp.h:71 [inline]
text_poke_sync arch/x86/kernel/alternative.c:2455 [inline]
text_poke_bp_batch+0x354/0xb30 arch/x86/kernel/alternative.c:2665
text_poke_flush arch/x86/kernel/alternative.c:2856 [inline]
text_poke_finish+0x30/0x50 arch/x86/kernel/alternative.c:2863
arch_jump_label_transform_apply+0x1c/0x30 arch/x86/kernel/jump_label.c:146
static_key_enable_cpuslocked+0x136/0x260 kernel/jump_label.c:210
static_key_enable+0x1a/0x20 kernel/jump_label.c:223
toggle_allocation_gate+0xc0/0x250 mm/kfence/core.c:850
process_one_work kernel/workqueue.c:3238 [inline]
process_scheduled_works+0xac5/0x18e0 kernel/workqueue.c:3319
worker_thread+0x870/0xd50 kernel/workqueue.c:3400
kthread+0x7b9/0x940 kernel/kthread.c:464
ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245