rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 1-...!: (1 ticks this GP) idle=b674/1/0x4000000000000000 softirq=68552/68552 fqs=2
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P13618/1:b..l
rcu: (detected by 0, t=10502 jiffies, g=56965, q=43 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 13631 Comm: syz.6.1891 Not tainted 6.16.0-rc7-syzkaller-00114-g327579671a9b #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:lock_release+0x89/0x3e0 kernel/locking/lockdep.c:5884
Code: 9a 02 0e 00 0f 84 44 02 00 00 65 8b 05 60 85 fe 10 85 c0 0f 85 35 02 00 00 65 4c 8b 3c 25 08 90 9c 92 41 83 bf ec 0a 00 00 00 <0f> 85 1e 02 00 00 49 81 3e 00 43 60 93 0f 84 11 02 00 00 48 c7 44
RSP: 0018:ffffc90000a08c08 EFLAGS: 00000046
RAX: 0000000000000000 RBX: ffffffff898659c8 RCX: 436354d8ca92a900
RDX: 0000000000010000 RSI: ffffffff8be1ba60 RDI: ffffffff8be1ba20
RBP: 0000000000000001 R08: ffff88805824a15f R09: 1ffff1100b04942b
R10: dffffc0000000000 R11: ffffed100b04942c R12: ffff88805824a360
R13: ffffffff898659c8 R14: ffffffff8e13f0e0 R15: ffff888024cc0000
FS: 00007f25c45926c0(0000) GS:ffff888125d57000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000000 CR3: 000000007791c000 CR4: 00000000003526f0
Call Trace:
rcu_lock_release include/linux/rcupdate.h:341 [inline]
rcu_read_unlock include/linux/rcupdate.h:871 [inline]
advance_sched+0xb23/0xc90 net/sched/sch_taprio.c:987
__run_hrtimer kernel/time/hrtimer.c:1761 [inline]
__hrtimer_run_queues+0x52c/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:const_folio_flags include/linux/page-flags.h:347 [inline]
RIP: 0010:folio_test_swapbacked include/linux/page-flags.h:574 [inline]
RIP: 0010:mm_counter_file include/linux/mm.h:2602 [inline]
RIP: 0010:copy_present_ptes mm/memory.c:1052 [inline]
RIP: 0010:copy_pte_range mm/memory.c:1179 [inline]
RIP: 0010:copy_pmd_range+0x11ad/0x7000 mm/memory.c:1267
Code: 4c 8b 74 24 30 48 8b 44 24 10 42 80 3c 20 00 74 08 4c 89 f7 e8 f4 35 17 00 49 8b 1e 48 89 de 48 83 e6 01 31 ff e8 83 53 b7 ff <48> 83 e3 01 0f 85 cb 5a 00 00 e8 94 4e b7 ff 4c 89 ff be 08 00 00
RSP: 0018:ffffc900054873e0 EFLAGS: 00000297
RAX: ffffffff8208d71d RBX: 0000000000000000 RCX: ffff888024cc0000
RDX: 0000000000000002 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90005487650 R08: ffffea0001d04ff3 R09: 1ffffd40003a09fe
R10: dffffc0000000000 R11: fffff940003a09ff R12: dffffc0000000000
R13: ffff88807a0f48e0 R14: ffffea0001d04fc8 R15: ffffea0001d04fc0
copy_pud_range mm/memory.c:1304 [inline]
copy_p4d_range mm/memory.c:1328 [inline]
copy_page_range+0xc46/0x1270 mm/memory.c:1416
dup_mmap+0xf57/0x1ac0 mm/mmap.c:1838
dup_mm kernel/fork.c:1477 [inline]
copy_mm+0x13c/0x4b0 kernel/fork.c:1529
copy_process+0x16d3/0x3b80 kernel/fork.c:2169
kernel_clone+0x224/0x7f0 kernel/fork.c:2599
__do_sys_clone kernel/fork.c:2742 [inline]
__se_sys_clone kernel/fork.c:2726 [inline]
__x64_sys_clone+0x18b/0x1e0 kernel/fork.c:2726
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: 0033:0x7f25c378e9a9
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:00007f25c4591fe8 EFLAGS: 00000206 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007f25c39b5fa0 RCX: 00007f25c378e9a9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000011
RBP: 00007f25c3810d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f25c39b5fa0 R15: 00007ffc6c01c038
task:syz.1.1888 state:R running task stack:23240 pid:13618 tgid:13615 ppid:5849 task_flags:0x400140 flags:0x00004006
Call Trace:
context_switch kernel/sched/core.c:5397 [inline]
__schedule+0x16aa/0x4c90 kernel/sched/core.c:6786
preempt_schedule_irq+0xb5/0x150 kernel/sched/core.c:7109
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:unwind_next_frame+0x530/0x2390 arch/x86/kernel/unwind_orc.c:515
Code: 44 24 28 0f b6 04 28 84 c0 4c 8b 7c 24 70 0f 85 6d 18 00 00 48 8b 44 24 10 88 18 0f b7 1e 83 e3 0f 83 fb 05 0f 8f 85 00 00 00 <83> fb 03 0f 8f 01 01 00 00 83 fb 02 0f 84 9f 01 00 00 83 fb 03 0f
RSP: 0018:ffffc9000c35e938 EFLAGS: 00000297
RAX: ffffc9000c35ea3d RBX: 0000000000000004 RCX: ffffffff900dcb90
RDX: ffffffff90b608f6 RSI: ffffffff90b608fa RDI: ffffffff8be1ba20
RBP: dffffc0000000000 R08: 0000000000000001 R09: ffffffff8172aae5
R10: ffffc9000c35ea58 R11: ffffffff81acfd40 R12: ffffffff90b608fb
R13: ffffc9000c35ea58 R14: ffffc9000c35ea08 R15: ffffc9000c35ea40
arch_stack_walk+0x11c/0x150 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122
ref_tracker_alloc+0x17d/0x460 lib/ref_tracker.c:209
__netdev_tracker_alloc include/linux/netdevice.h:4341 [inline]
netdev_hold include/linux/netdevice.h:4370 [inline]
netdev_queue_add_kobject net/core/net-sysfs.c:1973 [inline]
netdev_queue_update_kobjects+0x1d1/0x6c0 net/core/net-sysfs.c:2035
register_queue_kobjects net/core/net-sysfs.c:2098 [inline]
netdev_register_kobject+0x236/0x2f0 net/core/net-sysfs.c:2340
register_netdevice+0x126c/0x1ae0 net/core/dev.c:11105
bond_newlink+0x60/0xb0 drivers/net/bonding/bond_netlink.c:579
rtnl_newlink_create+0x30d/0xb00 net/core/rtnetlink.c:3823
__rtnl_newlink net/core/rtnetlink.c:3940 [inline]
rtnl_newlink+0x16d6/0x1c70 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:2552
netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline]
netlink_unicast+0x75c/0x8e0 net/netlink/af_netlink.c:1346
netlink_sendmsg+0x805/0xb30 net/netlink/af_netlink.c:1896
sock_sendmsg_nosec net/socket.c:712 [inline]
__sock_sendmsg+0x219/0x270 net/socket.c:727
____sys_sendmsg+0x505/0x830 net/socket.c:2566
___sys_sendmsg+0x21f/0x2a0 net/socket.c:2620
__sys_sendmsg net/socket.c:2652 [inline]
__do_sys_sendmsg net/socket.c:2657 [inline]
__se_sys_sendmsg net/socket.c:2655 [inline]
__x64_sys_sendmsg+0x19b/0x260 net/socket.c:2655
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: 0033:0x7f317698e9a9
RSP: 002b:00007f31777c0038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f3176bb5fa0 RCX: 00007f317698e9a9
RDX: 0000000000000000 RSI: 0000200000000080 RDI: 0000000000000005
RBP: 00007f3176a10d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f3176bb5fa0 R15: 00007ffcc930f028
rcu: rcu_preempt kthread starved for 10498 jiffies! g56965 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:26792 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5397 [inline]
__schedule+0x16aa/0x4c90 kernel/sched/core.c:6786
__schedule_loop kernel/sched/core.c:6864 [inline]
schedule+0x165/0x360 kernel/sched/core.c:6879
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: 9252 Comm: syz-executor Not tainted 6.16.0-rc7-syzkaller-00114-g327579671a9b #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:mac80211_hwsim_tx_frame_no_nl+0x7cb/0x11c0 drivers/net/wireless/virtual/mac80211_hwsim.c:1833
Code: 00 00 00 00 00 00 4c 39 eb 74 70 4d 8d bd 10 3e 00 00 4c 89 f8 48 c1 e8 03 42 0f b6 04 30 84 c0 0f 85 b4 05 00 00 41 80 3f 00 <74> 59 4d 8d bd 11 3e 00 00 4c 89 f8 48 c1 e8 03 42 0f b6 04 30 84
RSP: 0018:ffffc90000007980 EFLAGS: 00000202
RAX: 0000000000000000 RBX: ffff8880294fb0a0 RCX: ffff888027dfda00
RDX: 0000000000000100 RSI: ffffffff8d982ff2 RDI: ffffffff8be1ba80
RBP: ffffc90000007b18 R08: ffffffff8fa0b3f7 R09: 1ffffffff1f4167e
R10: dffffc0000000000 R11: fffffbfff1f4167f R12: ffff8880294fb338
R13: ffff8880795b30a0 R14: dffffc0000000000 R15: ffff8880795b6eb0
FS: 0000555576599500(0000) GS:ffff888125c57000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000005cb1c000 CR4: 00000000003526f0
Call Trace:
mac80211_hwsim_tx_frame+0x1b5/0x200 drivers/net/wireless/virtual/mac80211_hwsim.c:2222
mac80211_hwsim_beacon_tx+0x3f0/0x860 drivers/net/wireless/virtual/mac80211_hwsim.c:2323
__iterate_interfaces+0x2ab/0x590 net/mac80211/util.c:761
ieee80211_iterate_active_interfaces_atomic+0xdb/0x180 net/mac80211/util.c:797
mac80211_hwsim_beacon+0xbb/0x1c0 drivers/net/wireless/virtual/mac80211_hwsim.c:2353
__run_hrtimer kernel/time/hrtimer.c:1761 [inline]
__hrtimer_run_queues+0x52c/0xc60 kernel/time/hrtimer.c:1825
hrtimer_run_softirq+0x187/0x2b0 kernel/time/hrtimer.c:1842
handle_softirqs+0x283/0x870 kernel/softirq.c:579
__do_softirq kernel/softirq.c:613 [inline]
invoke_softirq kernel/softirq.c:453 [inline]
__irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680
irq_exit_rcu+0x9/0x30 kernel/softirq.c:696
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1050
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
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 80 6e 0b 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 2b 6a 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 10 6a 0b
RSP: 0018:ffffc9000d99f580 EFLAGS: 00000293
RAX: ffffffff81b4bbb0 RBX: ffff8880b863b040 RCX: ffff888027dfda00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc9000d99f6e0 R08: ffffffff8fa0b3f7 R09: 1ffffffff1f4167e
R10: dffffc0000000000 R11: fffffbfff1f4167f R12: 1ffff110170e7f2d
R13: dffffc0000000000 R14: 0000000000000001 R15: ffff8880b873f968
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
dup_mmap+0x15a0/0x1ac0 mm/mmap.c:1877
dup_mm kernel/fork.c:1477 [inline]
copy_mm+0x13c/0x4b0 kernel/fork.c:1529
copy_process+0x16d3/0x3b80 kernel/fork.c:2169
kernel_clone+0x224/0x7f0 kernel/fork.c:2599
__do_sys_clone kernel/fork.c:2742 [inline]
__se_sys_clone kernel/fork.c:2726 [inline]
__x64_sys_clone+0x18b/0x1e0 kernel/fork.c:2726
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: 0033:0x7f76be385213
Code: 1f 84 00 00 00 00 00 64 48 8b 04 25 10 00 00 00 45 31 c0 31 d2 31 f6 bf 11 00 20 01 4c 8d 90 d0 02 00 00 b8 38 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 35 89 c2 85 c0 75 2c 64 48 8b 04 25 10 00 00
RSP: 002b:00007ffde5a2e3f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f76be385213
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000001
R10: 00005555765997d0 R11: 0000000000000246 R12: 0000000000000000
R13: 00000000000927c0 R14: 00000000000cf77e R15: 00007ffde5a2e590