rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P6492/1:b..l
(detected by 1, t=10502 jiffies, g=79961, q=221 ncpus=2)
task:syz-executor state:R running task stack:20816 pid:6492 ppid:6463 flags:0x00004002
Call Trace:
context_switch kernel/sched/core.c:5244 [inline]
__schedule+0x10ec/0x40b0 kernel/sched/core.c:6561
preempt_schedule_irq+0xb1/0x150 kernel/sched/core.c:6873
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_page_owner mm/page_owner.c:106 [inline]
RIP: 0010:__reset_page_owner+0xbf/0x1a0 mm/page_owner.c:151
Code: 8c 00 00 00 e8 d2 57 a7 ff 41 83 ee 01 0f 82 ba 00 00 00 e8 c3 57 a7 ff 4c 89 ff be 08 00 00 00 e8 96 7a f7 ff 49 0f ba 37 01 <4c> 8b 2d 9a b6 e9 0a 4b 8d 7c 2f 0c 48 89 f8 48 c1 e8 03 42 0f b6
RSP: 0018:ffffc90005367690 EFLAGS: 00000257
RAX: ffffffff81d97701 RBX: 1ffffffff1986ed0 RCX: ffffffff81d9773a
RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffff88801a83fbd0
RBP: 0000000000000000 R08: dffffc0000000000 R09: ffffed1003507f7b
R10: ffffed1003507f7b R11: 1ffff11003507f7a R12: dffffc0000000000
R13: 0000000000000000 R14: 0000000000000000 R15: ffff88801a83fbd0
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1459 [inline]
free_pcp_prepare mm/page_alloc.c:1509 [inline]
free_unref_page_prepare+0x8b4/0x9a0 mm/page_alloc.c:3384
free_unref_page_list+0xbb/0x8e0 mm/page_alloc.c:3525
release_pages+0x1f92/0x2200 mm/swap.c:1035
__pagevec_release+0x6d/0xe0 mm/swap.c:1055
pagevec_release include/linux/pagevec.h:71 [inline]
folio_batch_release include/linux/pagevec.h:135 [inline]
shmem_undo_range+0x75b/0x2050 mm/shmem.c:946
shmem_truncate_range mm/shmem.c:1062 [inline]
shmem_evict_inode+0x248/0xa40 mm/shmem.c:1171
evict+0x485/0x870 fs/inode.c:705
do_unlinkat+0x377/0x560 fs/namei.c:4397
__do_sys_unlink fs/namei.c:4438 [inline]
__se_sys_unlink fs/namei.c:4436 [inline]
__x64_sys_unlink+0x45/0x50 fs/namei.c:4436
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f9436f8e1d7
RSP: 002b:00007ffd3546dc98 EFLAGS: 00000206 ORIG_RAX: 0000000000000057
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f9436f8e1d7
RDX: 00007ffd3546dcc0 RSI: 00007ffd3546dd50 RDI: 00007ffd3546dd50
RBP: 00007ffd3546dd50 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000100 R11: 0000000000000206 R12: 00007ffd3546ede0
R13: 00007f9437011c2d R14: 00000000000f6bad R15: 00007ffd3546ee20
rcu: rcu_preempt kthread starved for 10538 jiffies! g79961 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:27840 pid:16 ppid:2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5244 [inline]
__schedule+0x10ec/0x40b0 kernel/sched/core.c:6561
schedule+0xb9/0x180 kernel/sched/core.c:6637
schedule_timeout+0x15c/0x280 kernel/time/timer.c:1965
rcu_gp_fqs_loop+0x2f2/0x1310 kernel/rcu/tree.c:1706
rcu_gp_kthread+0x95/0x380 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:
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 12605 Comm: syz.1.1697 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:complete_signal+0x1a1/0xc50 kernel/signal.c:1016
Code: 00 00 0c 31 ff e8 1f 28 30 00 48 81 e3 00 00 00 0c 0f 84 91 02 00 00 e8 2d 24 30 00 49 bc 00 00 00 00 00 fc ff df 48 8b 1c 24 <31> ff 44 8b 7c 24 20 44 89 fe e8 70 27 30 00 45 85 ff 0f 84 41 02
RSP: 0018:ffffc90000007da8 EFLAGS: 00000006
RAX: ffffffff8150aa0a RBX: ffff88802b64c380 RCX: ffff88802c409dc0
RDX: 0000000000010000 RSI: 0000000000010000 RDI: 0000000000000000
RBP: ffff88802c409dc0 R08: dffffc0000000000 R09: ffff88808f3376b4
R10: ffffed1011e66edb R11: 1ffff11011e66ed6 R12: dffffc0000000000
R13: 0000000000010000 R14: 0000000000010000 R15: ffff88802c409dc0
FS: 00007f182b5956c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c29ed12 CR3: 000000007ae60000 CR4: 00000000003526f0
DR0: 0000000000000001 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
__send_signal_locked+0xb0a/0xde0 kernel/signal.c:1195
do_send_sig_info kernel/signal.c:1301 [inline]
group_send_sig_info+0x1f6/0x250 kernel/signal.c:1449
do_bpf_send_signal+0x7b/0x150 kernel/trace/bpf_trace.c:840
irq_work_single+0xd1/0x230 kernel/irq_work.c:211
irq_work_run_list kernel/irq_work.c:242 [inline]
irq_work_run+0x152/0x2e0 kernel/irq_work.c:251
__sysvec_irq_work+0xba/0x350 arch/x86/kernel/irq_work.c:22
instr_sysvec_irq_work arch/x86/kernel/irq_work.c:17 [inline]
sysvec_irq_work+0x98/0xc0 arch/x86/kernel/irq_work.c:17
asm_sysvec_irq_work+0x16/0x20 arch/x86/include/asm/idtentry.h:728
RIP: 0010:arch_static_branch arch/x86/include/asm/jump_label.h:27 [inline]
RIP: 0010:static_key_false include/linux/jump_label.h:207 [inline]
RIP: 0010:native_write_msr arch/x86/include/asm/msr.h:147 [inline]
RIP: 0010:wrmsr arch/x86/include/asm/msr.h:254 [inline]
RIP: 0010:native_apic_msr_write+0x35/0x50 arch/x86/include/asm/apic.h:206
Code: 74 2a 83 ff 30 74 25 eb 10 81 ff d0 00 00 00 74 1b 81 ff e0 00 00 00 74 13 c1 ef 04 81 c7 00 08 00 00 89 f9 89 f0 31 d2 0f 30 <66> 90 c3 89 f6 31 d2 e9 3f cb f7 02 66 2e 0f 1f 84 00 00 00 00 00
RSP: 0018:ffffc90003b77cb0 EFLAGS: 00000246
RAX: 00000000000000f6 RBX: ffffffff8c5e4b88 RCX: 000000000000083f
RDX: 0000000000000000 RSI: 00000000000000f6 RDI: 000000000000083f
RBP: 0000000000000000 R08: dffffc0000000000 R09: fffff5200076ef85
R10: fffff5200076ef85 R11: 1ffff9200076ef84 R12: ffff8880b8e33e01
R13: dffffc0000000000 R14: dffffc0000000000 R15: 0000000000000020
arch_irq_work_raise+0x82/0xd0 arch/x86/kernel/irq_work.c:31
irq_work_queue+0x95/0x140 kernel/irq_work.c:114
bpf_send_signal_common+0x2b2/0x420 kernel/trace/bpf_trace.c:879
____bpf_send_signal kernel/trace/bpf_trace.c:888 [inline]
bpf_send_signal+0x15/0x20 kernel/trace/bpf_trace.c:886
bpf_prog_7ba5217f62dcd359+0x38/0x3c
bpf_dispatcher_nop_func include/linux/bpf.h:1011 [inline]
__bpf_prog_run include/linux/filter.h:603 [inline]
bpf_prog_run include/linux/filter.h:610 [inline]
__bpf_trace_run kernel/trace/bpf_trace.c:2285 [inline]
bpf_trace_run2+0x1cd/0x3b0 kernel/trace/bpf_trace.c:2324
__bpf_trace_sys_enter+0x60/0x70 include/trace/events/syscalls.h:18
trace_sys_enter+0x6b/0x80 include/trace/events/syscalls.h:18
syscall_trace_enter+0xf0/0x150 kernel/entry/common.c:81
do_syscall_64+0x24/0xa0 arch/x86/entry/common.c:77
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f182a72ae09
Code: 64 c7 00 16 00 00 00 b8 ff ff ff ff c3 0f 1f 40 00 90 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 c7 c0 0f 00 00 00 0f 05 <0f> 1f 80 00 00 00 00 48 81 ec 48 01 00 00 49 89 d0 64 48 8b 04 25
RSP: 002b:00007f182b594b40 EFLAGS: 00000246 ORIG_RAX: 000000000000000f
RAX: ffffffffffffffda RBX: 00007f182a9d6188 RCX: 00007f182a72ae09
RDX: 00007f182b594b40 RSI: 00007f182b594c70 RDI: 0000000000000011
RBP: 00007f182a9d6180 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f182a9d6218 R14: 00007ffc139e6de0 R15: 00007ffc139e6ec8