sched: DL replenish lagged too much
rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P13904/3:b..l P13880/1:b..l P13902/1:b..l P13893/1:b..l
rcu: (detected by 1, t=10502 jiffies, g=61377, q=630 ncpus=2)
task:syz.6.1902 state:R running task stack:25240 pid:13893 tgid:13893 ppid:12072 task_flags:0x400040 flags:0x00004002
Call Trace:
context_switch kernel/sched/core.c:5357 [inline]
__schedule+0x1190/0x5de0 kernel/sched/core.c:6961
preempt_schedule_common+0x44/0xc0 kernel/sched/core.c:7145
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]
insert_page+0x139/0x200 mm/memory.c:2205
vm_insert_page+0x2c1/0x440 mm/memory.c:2354
kcov_mmap+0xbf/0x140 kernel/kcov.c:506
vfs_mmap include/linux/fs.h:2289 [inline]
mmap_file mm/internal.h:167 [inline]
__mmap_new_file_vma mm/vma.c:2413 [inline]
__mmap_new_vma mm/vma.c:2476 [inline]
__mmap_region+0x1311/0x27b0 mm/vma.c:2669
mmap_region+0x32b/0x3f0 mm/vma.c:2739
do_mmap+0xa3e/0x1210 mm/mmap.c:558
vm_mmap_pgoff+0x29e/0x470 mm/util.c:580
ksys_mmap_pgoff+0x32c/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/0x4c0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f67d978ec23
RSP: 002b:00007fff2ea350a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007f67d99b6308 RCX: 00007f67d978ec23
RDX: 0000000000000003 RSI: 0000000000400000 RDI: 00007f67d75f6000
RBP: 00007f67d99b6270 R08: 00000000000000db R09: 0000000000000000
R10: 0000000000000011 R11: 0000000000000246 R12: 0000000000000003
R13: 00007f67d99b6270 R14: 0000000000001a3a R15: 0000000000000006
task:syz.4.1903 state:R running task stack:27672 pid:13902 tgid:13895 ppid:5856 task_flags:0x40044c flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5357 [inline]
__schedule+0x1190/0x5de0 kernel/sched/core.c:6961
preempt_schedule_common+0x44/0xc0 kernel/sched/core.c:7145
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]
zap_pte_range mm/memory.c:1756 [inline]
zap_pmd_range mm/memory.c:1818 [inline]
zap_pud_range mm/memory.c:1847 [inline]
zap_p4d_range mm/memory.c:1868 [inline]
unmap_page_range+0xf77/0x42c0 mm/memory.c:1889
unmap_single_vma.constprop.0+0x153/0x240 mm/memory.c:1932
unmap_vmas+0x218/0x470 mm/memory.c:1976
exit_mmap+0x1b9/0xb90 mm/mmap.c:1280
__mmput+0x12a/0x410 kernel/fork.c:1130
mmput+0x62/0x70 kernel/fork.c:1152
exit_mm kernel/exit.c:582 [inline]
do_exit+0x7c7/0x2bf0 kernel/exit.c:949
do_group_exit+0xd3/0x2a0 kernel/exit.c:1102
get_signal+0x2673/0x26d0 kernel/signal.c:3034
arch_do_signal_or_restart+0x8f/0x7d0 arch/x86/kernel/signal.c:337
exit_to_user_mode_loop+0x84/0x110 kernel/entry/common.c:40
exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline]
syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline]
do_syscall_64+0x3f6/0x4c0 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f5f2bf8ebe9
RSP: 002b:00007f5f2ce82038 EFLAGS: 00000246 ORIG_RAX: 0000000000000029
RAX: 0000000000000003 RBX: 00007f5f2c1b6180 RCX: 00007f5f2bf8ebe9
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000002
RBP: 00007f5f2c011e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f5f2c1b6218 R14: 00007f5f2c1b6180 R15: 00007fffd5280b58
task:syz.0.1898 state:R running task stack:23640 pid:13880 tgid:13879 ppid:5843 task_flags:0x400740 flags:0x00004002
Call Trace:
context_switch kernel/sched/core.c:5357 [inline]
__schedule+0x1190/0x5de0 kernel/sched/core.c:6961
preempt_schedule_irq+0x51/0x90 kernel/sched/core.c:7288
irqentry_exit+0x36/0x90 kernel/entry/common.c:197
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:debug_lockdep_rcu_enabled+0x20/0x40 kernel/rcu/update.c:320
Code: 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 8b 05 16 9b 17 05 85 c0 74 20 8b 05 e0 cb 17 05 85 c0 74 16 65 48 8b 05 98 be 42 08 <8b> 80 ec 0a 00 00 85 c0 0f 94 c0 0f b6 c0 e9 4d ff 02 00 66 2e 0f
RSP: 0018:ffffc900058963e8 EFLAGS: 00000202
RAX: ffff888078fe8000 RBX: ffffc90005896bb0 RCX: ffffc90005898001
RDX: ffffc90005896bb8 RSI: ffffc90005896b88 RDI: ffffc90005896470
RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000002 R11: 0000000000011eea R12: ffffc900058964b0
R13: ffffc90005896460 R14: ffffc90005896bb0 R15: ffffc90005896494
rcu_read_unlock include/linux/rcupdate.h:869 [inline]
class_rcu_destructor include/linux/rcupdate.h:1155 [inline]
unwind_next_frame+0x3de/0x20a0 arch/x86/kernel/unwind_orc.c:479
arch_stack_walk+0x94/0x100 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0x8e/0xc0 kernel/stacktrace.c:122
save_stack+0x160/0x1f0 mm/page_owner.c:156
__set_page_owner+0x91/0x550 mm/page_owner.c:329
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x1c0/0x230 mm/page_alloc.c:1851
prep_new_page mm/page_alloc.c:1859 [inline]
get_page_from_freelist+0x132b/0x38e0 mm/page_alloc.c:3858
__alloc_frozen_pages_noprof+0x261/0x23f0 mm/page_alloc.c:5148
alloc_pages_mpol+0x1fb/0x550 mm/mempolicy.c:2416
folio_alloc_mpol_noprof+0x36/0x2f0 mm/mempolicy.c:2435
shmem_alloc_folio+0x135/0x160 mm/shmem.c:1908
shmem_alloc_and_add_folio+0x499/0xc20 mm/shmem.c:1947
shmem_get_folio_gfp+0x67f/0x1600 mm/shmem.c:2597
shmem_get_folio mm/shmem.c:2703 [inline]
shmem_write_begin+0x160/0x300 mm/shmem.c:3353
generic_perform_write+0x3c2/0x900 mm/filemap.c:4175
shmem_file_write_iter+0x10e/0x140 mm/shmem.c:3528
__kernel_write_iter+0x317/0xb10 fs/read_write.c:619
dump_emit_page fs/coredump.c:1296 [inline]
dump_user_range+0x413/0xb70 fs/coredump.c:1370
elf_core_dump+0x2929/0x3b60 fs/binfmt_elf.c:2085
coredump_write fs/coredump.c:1049 [inline]
vfs_coredump+0x2b97/0x5670 fs/coredump.c:1168
get_signal+0x22e3/0x26d0 kernel/signal.c:3019
arch_do_signal_or_restart+0x8f/0x7d0 arch/x86/kernel/signal.c:337
exit_to_user_mode_loop+0x84/0x110 kernel/entry/common.c:40
exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline]
syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline]
do_syscall_64+0x3f6/0x4c0 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fde60b8ebe9
RSP: 002b:00007fde61a840e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00007fde60db5fa8 RCX: 00007fde60b8ebe9
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007fde60db5fac
RBP: 00007fde60db5fa0 R08: 00007fde61a85000 R09: 0000000000000000
R10: 0000000000000592 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fde60db6038 R14: 00007ffd1c79c910 R15: 00007ffd1c79c9f8
task:syz.6.1902 state:R running task stack:25400 pid:13904 tgid:13893 ppid:12072 task_flags:0x400140 flags:0x00004002
Call Trace:
context_switch kernel/sched/core.c:5357 [inline]
__schedule+0x1190/0x5de0 kernel/sched/core.c:6961
preempt_schedule_common+0x44/0xc0 kernel/sched/core.c:7145
preempt_schedule_thunk+0x16/0x30 arch/x86/entry/thunk.S:12
__local_bh_enable_ip+0x107/0x120 kernel/softirq.c:414
local_bh_enable include/linux/bottom_half.h:33 [inline]
rcu_read_unlock_bh include/linux/rcupdate.h:910 [inline]
__dev_queue_xmit+0xb06/0x4490 net/core/dev.c:4752
dev_queue_xmit include/linux/netdevice.h:3361 [inline]
neigh_connected_output+0x3da/0x620 net/core/neighbour.c:1624
neigh_output include/net/neighbour.h:547 [inline]
ip6_finish_output2+0xaee/0x2020 net/ipv6/ip6_output.c:141
__ip6_finish_output+0x3cd/0x1010 net/ipv6/ip6_output.c:215
ip6_finish_output net/ipv6/ip6_output.c:226 [inline]
NF_HOOK_COND include/linux/netfilter.h:307 [inline]
ip6_output+0x1ca/0x3e0 net/ipv6/ip6_output.c:248
ip6_mr_output+0x233/0x11b0 net/ipv6/ip6mr.c:2415
dst_output include/net/dst.h:461 [inline]
dst_output include/net/dst.h:459 [inline]
ip6_local_out+0x2a6/0x4d0 net/ipv6/output_core.c:155
ip6_send_skb+0x112/0x460 net/ipv6/ip6_output.c:1984
udp_v6_send_skb+0x96f/0x1910 net/ipv6/udp.c:1439
udpv6_sendmsg+0x23a8/0x2d20 net/ipv6/udp.c:1730
inet6_sendmsg+0x105/0x140 net/ipv6/af_inet6.c:659
sock_sendmsg_nosec net/socket.c:714 [inline]
__sock_sendmsg net/socket.c:729 [inline]
____sys_sendmsg+0x705/0xc70 net/socket.c:2614
___sys_sendmsg+0x134/0x1d0 net/socket.c:2668
__sys_sendmmsg+0x200/0x420 net/socket.c:2757
__do_sys_sendmmsg net/socket.c:2784 [inline]
__se_sys_sendmmsg net/socket.c:2781 [inline]
__x64_sys_sendmmsg+0x9c/0x100 net/socket.c:2781
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f67d978ebe9
RSP: 002b:00007f67da650038 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 00007f67d99b6180 RCX: 00007f67d978ebe9
RDX: 0400000000000172 RSI: 0000200000003cc0 RDI: 0000000000000007
RBP: 00007f67d9811e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000004001c00 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f67d99b6218 R14: 00007f67d99b6180 R15: 00007fff2ea34fe8
rcu: rcu_preempt kthread starved for 9744 jiffies! g61377 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:27784 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5357 [inline]
__schedule+0x1190/0x5de0 kernel/sched/core.c:6961
__schedule_loop kernel/sched/core.c:7043 [inline]
schedule+0xe7/0x3a0 kernel/sched/core.c:7058
schedule_timeout+0x123/0x290 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x1ea/0xb00 kernel/rcu/tree.c:2083
rcu_gp_kthread+0x270/0x380 kernel/rcu/tree.c:2285
kthread+0x3c5/0x780 kernel/kthread.c:463
ret_from_fork+0x5d7/0x6f0 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:
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:pv_native_safe_halt+0xf/0x20 arch/x86/kernel/paravirt.c:82
Code: 4c 62 02 c3 cc cc cc cc 0f 1f 00 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 52 16 00 fb f4 4c 09 03 00 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90
RSP: 0018:ffffffff8e207e08 EFLAGS: 000002c2
RAX: 0000000003359603 RBX: 0000000000000000 RCX: ffffffff8b93bc29
RDX: 0000000000000000 RSI: ffffffff8de50210 RDI: ffffffff8c162900
RBP: fffffbfff1c52ef8 R08: 0000000000000001 R09: ffffed1017086655
R10: ffff8880b84332ab R11: 0000000000000000 R12: 0000000000000000
R13: ffffffff8e2977c0 R14: ffffffff90ab4b90 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff8881246b9000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd404251c77 CR3: 0000000074d57000 CR4: 00000000003526f0
Call Trace:
arch_safe_halt arch/x86/include/asm/paravirt.h:107 [inline]
default_idle+0x13/0x20 arch/x86/kernel/process.c:757
default_idle_call+0x6d/0xb0 kernel/sched/idle.c:122
cpuidle_idle_call kernel/sched/idle.c:190 [inline]
do_idle+0x391/0x510 kernel/sched/idle.c:330
cpu_startup_entry+0x4f/0x60 kernel/sched/idle.c:428
rest_init+0x16b/0x2b0 init/main.c:744
start_kernel+0x3ee/0x4d0 init/main.c:1097
x86_64_start_reservations+0x18/0x30 arch/x86/kernel/head64.c:307
x86_64_start_kernel+0x130/0x190 arch/x86/kernel/head64.c:288
common_startup_64+0x13e/0x148