rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 1-...!: (1 GPs behind) idle=f6dc/1/0x4000000000000000 softirq=242084/242088 fqs=0
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P6170/1:b..l
rcu: (detected by 0, t=10506 jiffies, g=190001, q=10 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 6193 Comm: syz.6.11969 Not tainted 6.16.0-rc1-syzkaller-00101-g27605c8c0f69 #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:enqueue_hrtimer+0xce/0x3a0 kernel/time/hrtimer.c:1089
Code: 11 00 eb 19 e8 f3 ba 11 00 eb 12 80 3d fd 43 db 0d 01 0f 85 15 01 00 00 e8 df ba 11 00 4d 89 f5 49 c1 ed 03 43 80 7c 25 00 00 <74> 08 4c 89 f7 e8 78 07 73 00 4d 8b 3e 49 83 c7 4c 4c 89 f8 48 c1
RSP: 0018:ffffc90000a08d08 EFLAGS: 00000046
RAX: ffffffff81ae92f6 RBX: ffff888031bbd340 RCX: ffff88802e79da00
RDX: 0000000000010000 RSI: ffffffff8be1af60 RDI: ffffffff8be1af20
RBP: 0000000000000001 R08: ffffffff8f9fe1f7 R09: 1ffffffff1f3fc3e
R10: dffffc0000000000 R11: fffffbfff1f3fc3f R12: dffffc0000000000
R13: 1ffff110170e4f98 R14: ffff8880b8727cc0 R15: 0000000000000000
FS: 00007f4d8507d6c0(0000) GS:ffff888125d86000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000006bcfa000 CR4: 00000000003526f0
Call Trace:
__run_hrtimer kernel/time/hrtimer.c:1778 [inline]
__hrtimer_run_queues+0x656/0xc60 kernel/time/hrtimer.c:1825
hrtimer_interrupt+0x45b/0xaa0 kernel/time/hrtimer.c:1887
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1039 [inline]
__sysvec_apic_timer_interrupt+0x108/0x410 arch/x86/kernel/apic/apic.c:1056
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1050
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:orc_ip arch/x86/kernel/unwind_orc.c:80 [inline]
RIP: 0010:__orc_find arch/x86/kernel/unwind_orc.c:102 [inline]
RIP: 0010:orc_find arch/x86/kernel/unwind_orc.c:227 [inline]
RIP: 0010:unwind_next_frame+0x1315/0x2390 arch/x86/kernel/unwind_orc.c:494
Code: 83 e0 fe 4c 8d 3c 45 00 00 00 00 49 01 ef 4c 89 f8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 0f b6 04 08 84 c0 75 27 49 63 07 <4c> 01 f8 49 8d 4f 04 4c 39 e0 48 0f 46 e9 49 8d 47 fc 48 0f 47 d8
RSP: 0018:ffffc9000ebc7858 EFLAGS: 00000246
RAX: fffffffff92f7991 RBX: ffffffff900bf580 RCX: dffffc0000000000
RDX: ffffffff900bf580 RSI: ffffffff90b357f4 RDI: ffffffff8be1af20
RBP: ffffffff900bf580 R08: 0000000000000001 R09: ffffffff81728de5
R10: ffffc9000ebc7978 R11: ffffffff81ace8a0 R12: ffffffff893b7062
R13: ffffffff900bf580 R14: ffffc9000ebc7928 R15: ffffffff900bf580
arch_stack_walk+0x11c/0x150 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122
kasan_save_stack mm/kasan/common.c:47 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:68
unpoison_slab_object mm/kasan/common.c:319 [inline]
__kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:345
kasan_slab_alloc include/linux/kasan.h:250 [inline]
slab_post_alloc_hook mm/slub.c:4148 [inline]
slab_alloc_node mm/slub.c:4197 [inline]
kmem_cache_alloc_noprof+0x1c1/0x3c0 mm/slub.c:4204
sk_prot_alloc+0x57/0x220 net/core/sock.c:2241
sk_alloc+0x3a/0x370 net/core/sock.c:2303
smc_sock_alloc net/smc/af_smc.c:401 [inline]
__smc_create+0xed/0x280 net/smc/af_smc.c:3368
__sock_create+0x4b3/0x9f0 net/socket.c:1541
sock_create net/socket.c:1599 [inline]
__sys_socket_create net/socket.c:1636 [inline]
__sys_socket+0xd7/0x1b0 net/socket.c:1683
__do_sys_socket net/socket.c:1697 [inline]
__se_sys_socket net/socket.c:1695 [inline]
__x64_sys_socket+0x7a/0x90 net/socket.c:1695
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f4d8418e929
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:00007f4d8507d038 EFLAGS: 00000246 ORIG_RAX: 0000000000000029
RAX: ffffffffffffffda RBX: 00007f4d843b5fa0 RCX: 00007f4d8418e929
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 000000000000002b
RBP: 00007f4d84210b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f4d843b5fa0 R15: 00007ffd1c0aaa48
task:syz.3.11961 state:R running task stack:22400 pid:6170 tgid:6166 ppid:5829 task_flags:0x400940 flags:0x00004002
Call Trace:
context_switch kernel/sched/core.c:5396 [inline]
__schedule+0x16a2/0x4cb0 kernel/sched/core.c:6785
preempt_schedule_irq+0xb5/0x150 kernel/sched/core.c:7108
irqentry_exit+0x6f/0x90 kernel/entry/common.c:307
asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:707
RIP: 0010:lockdep_enabled kernel/locking/lockdep.c:118 [inline]
RIP: 0010:lock_acquire+0x94/0x360 kernel/locking/lockdep.c:5847
Code: 0f 84 d7 01 00 00 83 3d 39 ef 01 0e 00 0f 84 f0 00 00 00 48 8b b4 24 90 00 00 00 4c 89 ef e8 63 4c 83 00 83 3d 1c ef 01 0e 00 <0f> 84 fa 00 00 00 65 8b 05 1f bc fb 10 85 c0 0f 85 eb 00 00 00 65
RSP: 0018:ffffc9000e21e870 EFLAGS: 00000202
RAX: 0000000000000001 RBX: 0000000000000000 RCX: 841fce3e48432500
RDX: 0000000000000000 RSI: ffffffff822ae9cb RDI: 1ffffffff1c27db4
RBP: ffffffff822ae9ae R08: 0000000000000000 R09: 0000000000000000
R10: 000000000000000d R11: ffffffff81ace8a0 R12: 0000000000000002
R13: ffffffff8e13eda0 R14: 0000000000000000 R15: 0000000000000000
rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
rcu_read_lock include/linux/rcupdate.h:841 [inline]
__update_page_owner_free_handle+0x4b/0x470 mm/page_owner.c:271
__reset_page_owner+0x85/0x1f0 mm/page_owner.c:309
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1248 [inline]
free_unref_folios+0xcd2/0x1570 mm/page_alloc.c:2763
shrink_folio_list+0x2aad/0x4d10 mm/vmscan.c:1568
reclaim_folio_list+0xee/0x500 mm/vmscan.c:2232
reclaim_pages+0x49a/0x5b0 mm/vmscan.c:2269
madvise_cold_or_pageout_pte_range+0x19be/0x1d40 mm/madvise.c:563
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+0x1093/0x1e70 mm/pagewalk.c:305
__walk_page_range+0x14c/0x710 mm/pagewalk.c:412
walk_page_range_mm+0x42d/0x620 mm/pagewalk.c:505
madvise_pageout_page_range mm/madvise.c:622 [inline]
madvise_pageout mm/madvise.c:649 [inline]
madvise_vma_behavior mm/madvise.c:1278 [inline]
madvise_walk_vmas mm/madvise.c:1539 [inline]
madvise_do_behavior+0x1c01/0x2e70 mm/madvise.c:1731
do_madvise+0x174/0x220 mm/madvise.c:1824
__do_sys_madvise mm/madvise.c:1833 [inline]
__se_sys_madvise mm/madvise.c:1831 [inline]
__x64_sys_madvise+0xa7/0xc0 mm/madvise.c:1831
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff8ca18e929
RSP: 002b:00007ff8cb0d3038 EFLAGS: 00000246 ORIG_RAX: 000000000000001c
RAX: ffffffffffffffda RBX: 00007ff8ca3b5fa0 RCX: 00007ff8ca18e929
RDX: 0000000000000015 RSI: 0000000000600000 RDI: 0000200000000000
RBP: 00007ff8ca210b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007ff8ca3b5fa0 R15: 00007ffeb28a5328
rcu: rcu_preempt kthread starved for 10506 jiffies! g190001 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:26504 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5396 [inline]
__schedule+0x16a2/0x4cb0 kernel/sched/core.c:6785
__schedule_loop kernel/sched/core.c:6863 [inline]
schedule+0x165/0x360 kernel/sched/core.c:6878
schedule_timeout+0x12b/0x270 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x301/0x1540 kernel/rcu/tree.c:2054
rcu_gp_kthread+0x99/0x390 kernel/rcu/tree.c:2256
kthread+0x70e/0x8a0 kernel/kthread.c:464
ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148
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: 5407 Comm: kworker/u8:1 Not tainted 6.16.0-rc1-syzkaller-00101-g27605c8c0f69 #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Workqueue: events_unbound toggle_allocation_gate
RIP: 0010:csd_lock_wait kernel/smp.c:340 [inline]
RIP: 0010:smp_call_function_many_cond+0xf69/0x12d0 kernel/smp.c:885
Code: 00 45 8b 2f 44 89 ee 83 e6 01 31 ff e8 50 78 0b 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 fb 73 0b 00 eb 37 f3 90 <43> 0f b6 04 2c 84 c0 75 10 41 f7 07 01 00 00 00 74 1e e8 e0 73 0b
RSP: 0018:ffffc9000df1f6a0 EFLAGS: 00000293
RAX: ffffffff81b4da10 RBX: ffff8880b863c9c0 RCX: ffff88802f4d1e00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc9000df1f800 R08: ffffffff8f9fe1f7 R09: 1ffffffff1f3fc3e
R10: dffffc0000000000 R11: fffffbfff1f3fc3f R12: 1ffff110170e825d
R13: dffffc0000000000 R14: 0000000000000001 R15: ffff8880b87412e8
FS: 0000000000000000(0000) GS:ffff888125c86000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00002000000bd038 CR3: 000000000df38000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000040006
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1052
on_each_cpu include/linux/smp.h:71 [inline]
smp_text_poke_sync_each_cpu arch/x86/kernel/alternative.c:2660 [inline]
smp_text_poke_batch_finish+0x5e0/0x1100 arch/x86/kernel/alternative.c:2870
arch_jump_label_transform_apply+0x1c/0x30 arch/x86/kernel/jump_label.c:146
static_key_enable_cpuslocked+0x128/0x250 kernel/jump_label.c:210
static_key_enable+0x1a/0x20 kernel/jump_label.c:223
toggle_allocation_gate+0xad/0x240 mm/kfence/core.c:850
process_one_work kernel/workqueue.c:3238 [inline]
process_scheduled_works+0xade/0x17b0 kernel/workqueue.c:3321
worker_thread+0x8a0/0xda0 kernel/workqueue.c:3402
kthread+0x70e/0x8a0 kernel/kthread.c:464
ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245