rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P10574/1:b..l P10862/1:b..l
rcu: (detected by 0, t=10503 jiffies, g=43429, q=355 ncpus=2)
task:sed state:R running task stack:25352 pid:10862 tgid:10862 ppid:10859 task_flags:0x400000 flags:0x00004002
Call Trace:
context_switch kernel/sched/core.c:5396 [inline]
__schedule+0x16f5/0x4d00 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_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:on_stack arch/x86/include/asm/stacktrace.h:-1 [inline]
RIP: 0010:unwind_next_frame+0x1853/0x2390 arch/x86/kernel/unwind_orc.c:665
Code: 13 22 b1 00 4d 8b 6e 08 4d 8d 7e 10 4c 89 f8 48 c1 e8 03 80 3c 28 00 74 08 4c 89 ff e8 f6 21 b1 00 49 8b 07 4d 39 e5 0f 96 c1 <4c> 39 e0 0f 97 c2 20 ca 80 fa 01 0f 85 63 01 00 00 49 8d 4c 24 08
RSP: 0018:ffffc9000eebea78 EFLAGS: 00000283
RAX: ffffc9000eec0000 RBX: ffffffff903d9f01 RCX: 0000000000000001
RDX: ffffc9000eebeb88 RSI: dffffc0000000000 RDI: ffffc9000eebeb50
RBP: dffffc0000000000 R08: ffffc9000eebeeb0 R09: 0000000000000000
R10: ffffc9000eebeb98 R11: fffff52001dd7d75 R12: ffffc9000eebeec0
R13: ffffc9000eeb8000 R14: ffffc9000eebeb48 R15: ffffc9000eebeb58
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
kmem_alloc_batch lib/debugobjects.c:371 [inline]
fill_pool+0x100/0x570 lib/debugobjects.c:403
debug_objects_fill_pool lib/debugobjects.c:725 [inline]
debug_object_activate+0x383/0x420 lib/debugobjects.c:814
debug_rcu_head_queue kernel/rcu/rcu.h:236 [inline]
__call_rcu_common kernel/rcu/tree.c:3075 [inline]
call_rcu+0x95/0x990 kernel/rcu/tree.c:3210
mas_wr_node_store lib/maple_tree.c:3887 [inline]
mas_wr_store_entry+0x1f1b/0x25b0 lib/maple_tree.c:4098
mas_store_prealloc+0xb00/0xf60 lib/maple_tree.c:5506
vma_iter_store_new mm/vma.h:462 [inline]
vma_link+0x254/0x450 mm/vma.c:1807
insert_vm_struct+0x199/0x260 mm/vma.c:3164
__install_special_mapping mm/mmap.c:1465 [inline]
_install_special_mapping+0x1b0/0x350 mm/mmap.c:1501
map_vdso+0x1df/0x480 arch/x86/entry/vdso/vma.c:159
load_elf_binary+0x1bd9/0x2790 fs/binfmt_elf.c:1276
search_binary_handler fs/exec.c:1665 [inline]
exec_binprm fs/exec.c:1697 [inline]
bprm_execve+0x999/0x1450 fs/exec.c:1749
do_execveat_common+0x510/0x6a0 fs/exec.c:1855
do_execve fs/exec.c:1929 [inline]
__do_sys_execve fs/exec.c:2005 [inline]
__se_sys_execve fs/exec.c:2000 [inline]
__x64_sys_execve+0x94/0xb0 fs/exec.c:2000
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: 0033:0x7fc519e71107
RSP: 002b:00007ffd5a2d0df8 EFLAGS: 00000246 ORIG_RAX: 000000000000003b
RAX: ffffffffffffffda RBX: 000055a9a8696080 RCX: 00007fc519e71107
RDX: 000055a9a86960a8 RSI: 000055a9a8696080 RDI: 000055a9a8696138
RBP: 000055a9a8696138 R08: 00007ffd5a2d5e70 R09: 0000000000000000
R10: 0000000000000008 R11: 0000000000000246 R12: 000055a9a86960a8
R13: 00007fc51a036e8b R14: 000055a9a86960a8 R15: 0000000000000000
task:syz-executor state:R running task stack:21960 pid:10574 tgid:10574 ppid:10557 task_flags:0x400140 flags:0x00004002
Call Trace:
context_switch kernel/sched/core.c:5396 [inline]
__schedule+0x16f5/0x4d00 kernel/sched/core.c:6785
preempt_schedule_common+0x83/0xd0 kernel/sched/core.c:6965
preempt_schedule+0xae/0xc0 kernel/sched/core.c:6989
preempt_schedule_thunk+0x16/0x30 arch/x86/entry/thunk.S:12
vprintk_emit+0x69a/0x7a0 kernel/printk/printk.c:2451
dev_vprintk_emit+0x337/0x3f0 drivers/base/core.c:4917
dev_printk_emit+0xe0/0x130 drivers/base/core.c:4928
__netdev_printk+0x3d7/0x4d0 net/core/dev.c:12509
netdev_info+0x10a/0x160 net/core/dev.c:12564
nsim_udp_tunnel_set_port+0x29b/0x440 drivers/net/netdevsim/udp_tunnels.c:34
udp_tunnel_nic_device_sync_one net/ipv4/udp_tunnel_nic.c:-1 [inline]
udp_tunnel_nic_device_sync_by_port net/ipv4/udp_tunnel_nic.c:246 [inline]
__udp_tunnel_nic_device_sync+0xb05/0x14c0 net/ipv4/udp_tunnel_nic.c:289
udp_tunnel_nic_device_sync net/ipv4/udp_tunnel_nic.c:312 [inline]
__udp_tunnel_nic_add_port+0xbd5/0xe50 net/ipv4/udp_tunnel_nic.c:531
udp_tunnel_nic_add_port include/net/udp_tunnel.h:365 [inline]
udp_tunnel_notify_add_rx_port+0x293/0x3e0 net/ipv4/udp_tunnel_core.c:143
geneve_socket_create drivers/net/geneve.c:612 [inline]
geneve_sock_add+0x55d/0x910 drivers/net/geneve.c:687
geneve_open+0xd2/0x140 drivers/net/geneve.c:729
__dev_open+0x46d/0x880 net/core/dev.c:1683
__dev_change_flags+0x1ea/0x6d0 net/core/dev.c:9458
netif_change_flags+0x88/0x1a0 net/core/dev.c:9521
do_setlink+0xc55/0x41c0 net/core/rtnetlink.c:3141
rtnl_changelink net/core/rtnetlink.c:3759 [inline]
__rtnl_newlink net/core/rtnetlink.c:3918 [inline]
rtnl_newlink+0x160b/0x1c70 net/core/rtnetlink.c:4055
rtnetlink_rcv_msg+0x7cc/0xb70 net/core/rtnetlink.c:6944
netlink_rcv_skb+0x208/0x470 net/netlink/af_netlink.c:2534
netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline]
netlink_unicast+0x75b/0x8d0 net/netlink/af_netlink.c:1339
netlink_sendmsg+0x805/0xb30 net/netlink/af_netlink.c:1883
sock_sendmsg_nosec net/socket.c:712 [inline]
__sock_sendmsg+0x219/0x270 net/socket.c:727
__sys_sendto+0x3bd/0x520 net/socket.c:2180
__do_sys_sendto net/socket.c:2187 [inline]
__se_sys_sendto net/socket.c:2183 [inline]
__x64_sys_sendto+0xde/0x100 net/socket.c:2183
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: 0033:0x7fa1855907bc
RSP: 002b:00007ffc7b7b97d0 EFLAGS: 00000293 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 00007fa1862e4620 RCX: 00007fa1855907bc
RDX: 000000000000002c RSI: 00007fa1862e4670 RDI: 0000000000000003
RBP: 0000000000000000 R08: 00007ffc7b7b9824 R09: 000000000000000c
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000003
R13: 0000000000000000 R14: 00007fa1862e4670 R15: 0000000000000000
rcu: rcu_preempt kthread starved for 10340 jiffies! g43429 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:27192 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5396 [inline]
__schedule+0x16f5/0x4d00 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: 10865 Comm: syz.8.1536 Not tainted 6.15.0-next-20250604-syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
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 60 78 0b 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 0b 74 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 f0 73 0b
RSP: 0000:ffffc9000ee0f720 EFLAGS: 00000293
RAX: ffffffff81b4eab0 RBX: ffff8880b863cb40 RCX: ffff88807b670000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc9000ee0f880 R08: ffffffff8fa123f7 R09: 1ffffffff1f4247e
R10: dffffc0000000000 R11: fffffbfff1f4247f R12: 1ffff110170e828d
R13: dffffc0000000000 R14: 0000000000000001 R15: ffff8880b8741468
FS: 000055558ccba500(0000) GS:ffff888125c4d000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9e355b6070 CR3: 000000002441e000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1052
__flush_tlb_multi arch/x86/include/asm/paravirt.h:91 [inline]
flush_tlb_multi arch/x86/mm/tlb.c:1361 [inline]
flush_tlb_mm_range+0x6b1/0x12c0 arch/x86/mm/tlb.c:1451
flush_tlb_page arch/x86/include/asm/tlbflush.h:324 [inline]
ptep_clear_flush+0x120/0x170 mm/pgtable-generic.c:101
wp_page_copy mm/memory.c:3635 [inline]
do_wp_page+0x1bc2/0x5800 mm/memory.c:4030
handle_pte_fault mm/memory.c:6105 [inline]
__handle_mm_fault+0x1144/0x5620 mm/memory.c:6232
handle_mm_fault+0x40a/0x8e0 mm/memory.c:6401
do_user_addr_fault+0xa81/0x1390 arch/x86/mm/fault.c:1336
handle_page_fault arch/x86/mm/fault.c:1476 [inline]
exc_page_fault+0x76/0xf0 arch/x86/mm/fault.c:1532
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0033:0x7f9e35255c5a
Code: 80 3d ad fa e8 00 00 0f 84 9b 00 00 00 53 48 89 fb 48 85 ff 74 1a 80 3d 6b c4 35 00 00 75 33 48 8b 43 10 48 c7 00 00 00 00 00 43 38 00 5b c3 64 48 8b 1c 25 c0 fe ff ff 48 85 db 0f 84 85 00
RSP: 002b:00007fff50c26f40 EFLAGS: 00010246
RAX: 00007f9e349ff000 RBX: 00007f9e355b6038 RCX: 00007f9e35345f37
RDX: 00007f9e355b5fa0 RSI: 00007f9e355b5fa0 RDI: 00007f9e355b6038
RBP: 0000000000000000 R08: 00007f9e355b5fa0 R09: 00007fff50c26de7
R10: 0000000000000008 R11: 0000000000000246 R12: 00007f9e355b5fac
R13: 00007f9e355b5fa0 R14: 0000000000001cce R15: 0000000000000007