rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 1-....: (8948 ticks this GP) idle=0ae4/1/0x4000000000000000 softirq=192087/200851 fqs=265
rcu: hardirqs softirqs csw/system
rcu: number: 26 53 2
rcu: cputime: 0 15136 145 ==> 15260(ms)
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P981/2:b..l P24579/1:b..l
rcu: (detected by 0, t=10502 jiffies, g=193221, q=1887 ncpus=2)
task:syz.7.4296 state:R running task stack:25504 pid:24579 tgid:24575 ppid:19537 task_flags:0x400040 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5260 [inline]
__schedule+0x14ef/0x4fb0 kernel/sched/core.c:6867
preempt_schedule_irq+0x4d/0xa0 kernel/sched/core.c:7194
irqentry_exit+0x597/0x620 kernel/entry/common.c:216
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:deref_stack_reg+0x1b3/0x230 arch/x86/kernel/unwind_orc.c:422
Code: 39 f0 0f 96 c0 20 c8 3c 01 75 30 4c 89 c7 49 89 f7 e8 11 08 00 00 49 89 c6 48 8b 5c 24 18 48 89 d8 48 c1 e8 03 42 80 3c 38 00 <74> 08 48 89 df e8 33 b8 b4 00 4c 89 33 b0 01 eb 02 31 c0 48 83 c4
RSP: 0018:ffffc9000b21ea40 EFLAGS: 00000246
RAX: 1ffff92001643d75 RBX: ffffc9000b21eba8 RCX: 0000000000000001
RDX: ffffc9000b21eba8 RSI: dffffc0000000000 RDI: ffffc9000b21fc30
RBP: 1ffff92001643d6d R08: ffffc9000b21fc30 R09: 0000000000000000
R10: ffffc9000b21ebb8 R11: fffff52001643d79 R12: 1ffff92001643d6e
R13: 1ffff92001643d6f R14: ffffc9000b21fe10 R15: dffffc0000000000
unwind_next_frame+0x18c6/0x23c0 arch/x86/kernel/unwind_orc.c:-1
arch_stack_walk+0x11b/0x150 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122
save_stack+0x122/0x230 mm/page_owner.c:165
__set_page_owner+0x8d/0x4c0 mm/page_owner.c:341
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x228/0x280 mm/page_alloc.c:1884
prep_new_page mm/page_alloc.c:1892 [inline]
get_page_from_freelist+0x24dc/0x2580 mm/page_alloc.c:3945
__alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5240
alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2486
folio_alloc_mpol_noprof mm/mempolicy.c:2505 [inline]
vma_alloc_folio_noprof+0xea/0x210 mm/mempolicy.c:2540
folio_prealloc+0x30/0x170 mm/memory.c:-1
wp_page_copy mm/memory.c:3722 [inline]
do_wp_page+0x1243/0x57b0 mm/memory.c:4183
handle_pte_fault mm/memory.c:6292 [inline]
__handle_mm_fault mm/memory.c:6414 [inline]
handle_mm_fault+0x1520/0x32a0 mm/memory.c:6583
do_user_addr_fault+0x75b/0x1360 arch/x86/mm/fault.c:1385
handle_page_fault arch/x86/mm/fault.c:1474 [inline]
exc_page_fault+0x6a/0xc0 arch/x86/mm/fault.c:1527
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618
RIP: 0010:__put_user_nocheck_4+0x3/0x10 arch/x86/lib/putuser.S:104
Code: d9 0f 01 cb 89 01 31 c9 0f 01 ca c3 cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 01 cb <89> 01 31 c9 0f 01 ca e9 d1 71 03 00 90 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc9000b21f8b8 EFLAGS: 00050202
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00002000002b8030
RDX: ffff88802c195b80 RSI: 0000000000000002 RDI: 00000000ffffffff
RBP: ffffc9000b21fa30 R08: ffffc9000b21f687 R09: 1ffff92001643ed0
R10: dffffc0000000000 R11: fffff52001643ed1 R12: 1ffff92001643f24
R13: 0000000000000002 R14: 00002000002b8000 R15: dffffc0000000000
____sys_recvmsg+0x2be/0x4a0 net/socket.c:2825
___sys_recvmsg+0x215/0x590 net/socket.c:2854
do_recvmmsg+0x334/0x800 net/socket.c:2949
__sys_recvmmsg net/socket.c:3023 [inline]
__do_sys_recvmmsg net/socket.c:3046 [inline]
__se_sys_recvmmsg net/socket.c:3039 [inline]
__x64_sys_recvmmsg+0x198/0x250 net/socket.c:3039
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f53cb99acb9
RSP: 002b:00007f53cc8fb028 EFLAGS: 00000246 ORIG_RAX: 000000000000012b
RAX: ffffffffffffffda RBX: 00007f53cbc16180 RCX: 00007f53cb99acb9
RDX: 0000000000010106 RSI: 00002000000000c0 RDI: 0000000000000004
RBP: 00007f53cba08bf7 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000002 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f53cbc16218 R14: 00007f53cbc16180 R15: 00007f53cbd3fa48
task:kworker/1:2 state:R running task stack:20408 pid:981 tgid:981 ppid:2 task_flags:0x4208060 flags:0x00080000
Workqueue: mld mld_dad_work
Call Trace:
context_switch kernel/sched/core.c:5260 [inline]
__schedule+0x14ef/0x4fb0 kernel/sched/core.c:6867
preempt_schedule_common+0x82/0xd0 kernel/sched/core.c:7051
preempt_schedule_thunk+0x16/0x30 arch/x86/entry/thunk.S:12
__local_bh_enable_ip+0xe1/0x130 kernel/softirq.c:457
local_bh_enable include/linux/bottom_half.h:33 [inline]
ip6t_do_table+0x137d/0x1560 net/ipv6/netfilter/ip6_tables.c:375
nf_hook_entry_hookfn include/linux/netfilter.h:158 [inline]
nf_hook_slow+0xc5/0x220 net/netfilter/core.c:623
nf_hook include/linux/netfilter.h:273 [inline]
NF_HOOK+0x255/0x3a0 include/linux/netfilter.h:316
mld_sendpack+0x8b4/0xe40 net/ipv6/mcast.c:1855
mld_dad_work+0x46/0x490 net/ipv6/mcast.c:2294
process_one_work kernel/workqueue.c:3257 [inline]
process_scheduled_works+0xaec/0x17a0 kernel/workqueue.c:3340
worker_thread+0x89f/0xd90 kernel/workqueue.c:3421
kthread+0x726/0x8b0 kernel/kthread.c:463
ret_from_fork+0x51b/0xa40 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 2962 jiffies! g193221 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:27512 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5260 [inline]
__schedule+0x14ef/0x4fb0 kernel/sched/core.c:6867
__schedule_loop kernel/sched/core.c:6949 [inline]
schedule+0x164/0x360 kernel/sched/core.c:6964
schedule_timeout+0x158/0x2c0 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x312/0x1560 kernel/rcu/tree.c:2083
rcu_gp_kthread+0x9d/0x3b0 kernel/rcu/tree.c:2285
kthread+0x726/0x8b0 kernel/kthread.c:463
ret_from_fork+0x51b/0xa40 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:
CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/13/2026
RIP: 0010:pv_native_safe_halt+0xf/0x20 arch/x86/kernel/paravirt.c:82
Code: 28 5f 02 e9 d3 e5 02 00 cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d d3 b7 10 00 fb f4 cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc 90 90 90 90 90
RSP: 0018:ffffffff8e007dc0 EFLAGS: 00000242
RAX: 000000000188a3cb RBX: ffffffff8198427d RCX: 0000000080000001
RDX: 0000000000000001 RSI: ffffffff8dacfb53 RDI: ffffffff8be73880
RBP: ffffffff8e007eb0 R08: ffff8880b86336db R09: 1ffff110170c66db
R10: dffffc0000000000 R11: ffffed10170c66dc R12: ffffffff8fceef70
R13: 1ffffffff1c12a78 R14: 0000000000000000 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff888125926000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb720e02cc3 CR3: 000000002edd8000 CR4: 00000000003526f0
Call Trace:
arch_safe_halt arch/x86/kernel/process.c:766 [inline]
default_idle+0x9/0x20 arch/x86/kernel/process.c:767
default_idle_call+0x72/0xb0 kernel/sched/idle.c:122
cpuidle_idle_call kernel/sched/idle.c:191 [inline]
do_idle+0x1bd/0x500 kernel/sched/idle.c:332
cpu_startup_entry+0x43/0x60 kernel/sched/idle.c:430
rest_init+0x2de/0x300 init/main.c:757
start_kernel+0x380/0x3d0 init/main.c:1206
x86_64_start_reservations+0x24/0x30 arch/x86/kernel/head64.c:310
x86_64_start_kernel+0x143/0x1c0 arch/x86/kernel/head64.c:291
common_startup_64+0x13e/0x147