rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 0-...!: (2 ticks this GP) idle=7774/1/0x4000000000000000 softirq=26199/26202 fqs=0
rcu: (detected by 1, t=10505 jiffies, g=12289, q=665 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 6728 Comm: rm Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:trace_lock_release include/trace/events/lock.h:69 [inline]
RIP: 0010:lock_release+0x4b/0x3e0 kernel/locking/lockdep.c:5879
Code: 89 44 24 28 0f 1f 44 00 00 65 8b 05 73 14 03 11 83 f8 08 0f 83 9a 02 00 00 89 c0 48 0f a3 05 5c 1a 06 0e 73 16 e8 45 f1 08 00 <84> c0 75 0d f6 05 ff ff ef 0d 01 0f 84 ad 02 00 00 83 3d 7d 4b 06
RSP: 0000:ffffc90003f8fb38 EFLAGS: 00000002
RAX: 0000000000000001 RBX: ffff888078eca2e8 RCX: 512ecd36a0918c00
RDX: 0000000000010000 RSI: ffffffff8be33660 RDI: ffffffff8be33620
RBP: ffff8881417bed50 R08: ffff8881417bec83 R09: 1ffff110282f7d90
R10: dffffc0000000000 R11: ffffed10282f7d91 R12: ffff888078eca340
R13: ffffffff899ac6af R14: ffff888078eca300 R15: ffff88807b9e7c00
FS: 0000000000000000(0000) GS:ffff888125c18000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa3a18e56c0 CR3: 00000000776c0000 CR4: 00000000003526f0
Call Trace:
__raw_spin_unlock include/linux/spinlock_api_smp.h:141 [inline]
_raw_spin_unlock+0x16/0x50 kernel/locking/spinlock.c:186
spin_unlock include/linux/spinlock.h:391 [inline]
advance_sched+0x99f/0xc90 net/sched/sch_taprio.c:986
__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+0x52/0xc0 arch/x86/kernel/apic/apic.c:1050
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0033:0x7fbfed4cdfcc
Code: 8b 4c 24 28 48 29 fe b9 12 08 00 00 44 8b 85 24 ff ff ff 49 03 7d 00 4c 89 9d 08 ff ff ff e8 5b b2 01 00 4c 8b 9d 08 ff ff ff <48> 83 f8 ff 0f 85 05 ff ff ff 48 8d 1d 63 4b 02 00 e9 72 0b 00 00
RSP: 002b:00007ffd01f7cff0 EFLAGS: 00000207
RAX: 00007fbfed40b000 RBX: 0000000000000004 RCX: 00007fbfed4e9242
RDX: 0000000000000005 RSI: 0000000000086000 RDI: 00007fbfed40b000
RBP: 00007ffd01f7d340 R08: 0000000000000003 R09: 0000000000010000
R10: 0000000000000812 R11: 00007ffd01f7d428 R12: 00007ffd01f7d028
R13: 00007fbfed4bd0c0 R14: 00007ffd01f7d3e0 R15: 00000fffa03ef9fe
rcu: rcu_preempt kthread starved for 10505 jiffies! g12289 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1
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:27496 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5357 [inline]
__schedule+0x1798/0x4cc0 kernel/sched/core.c:6961
__schedule_loop kernel/sched/core.c:7043 [inline]
schedule+0x165/0x360 kernel/sched/core.c:7058
schedule_timeout+0x12b/0x270 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x301/0x1540 kernel/rcu/tree.c:2083
rcu_gp_kthread+0x99/0x390 kernel/rcu/tree.c:2285
kthread+0x70e/0x8a0 kernel/kthread.c:463
ret_from_fork+0x3f9/0x770 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: 1 UID: 0 PID: 6438 Comm: udevd Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:csd_lock_wait kernel/smp.c:342 [inline]
RIP: 0010:smp_call_function_many_cond+0xd33/0x12d0 kernel/smp.c:877
Code: 45 8b 2c 24 44 89 ee 83 e6 01 31 ff e8 b6 62 0b 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 61 5e 0b 00 eb 38 f3 90 <42> 0f b6 04 2b 84 c0 75 11 41 f7 04 24 01 00 00 00 74 1e e8 45 5e
RSP: 0000:ffffc90003e6f720 EFLAGS: 00000293
RAX: ffffffff81b44ceb RBX: 1ffff110170c8341 RCX: ffff8880795d3c00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc90003e6f8a0 R08: ffffffff8fa38637 R09: 1ffffffff1f470c6
R10: dffffc0000000000 R11: fffffbfff1f470c7 R12: ffff8880b8641a08
R13: dffffc0000000000 R14: ffff8880b873b1c0 R15: 0000000000000000
FS: 00007f84b6b99880(0000) GS:ffff888125d18000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f84b73165e0 CR3: 00000000334c8000 CR4: 00000000003526f0
Call Trace:
on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1044
__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+0x6b1/0x12d0 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:3618 [inline]
do_wp_page+0x1bc2/0x5800 mm/memory.c:4013
handle_pte_fault mm/memory.c:6068 [inline]
__handle_mm_fault+0x1033/0x5440 mm/memory.c:6195
handle_mm_fault+0x40a/0x8e0 mm/memory.c:6364
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: 0033:0x7f84b72157c8
Code: 66 90 48 8b 05 79 96 0f 00 53 48 8b 1d 19 97 0f 00 66 0f 6e 08 8b 44 24 10 66 0f 6e 03 50 48 8d 05 1d 0e 10 00 50 66 0f 62 c1 <66> 0f d6 05 10 0e 10 00 e8 db f9 ff ff 8b 15 05 0e 10 00 48 8b 0d
RSP: 002b:00007fff461e8300 EFLAGS: 00010246
RAX: 00007f84b73165e0 RBX: 00007f84b730f248 RCX: 000055d778c9f660
RDX: 000055d778c8e95f RSI: 00007fff461e8470 RDI: 0000000000000001
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000
R10: 00007fff461e8875 R11: 0000000000000000 R12: 000055d778c8e95f
R13: 000055d778c9f660 R14: 0000000000000000 R15: 000055d778c94bcc