rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 1-...!: (1 ticks this GP) idle=fc3c/1/0x4000000000000000 softirq=25150/25150 fqs=0
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P5866/1:b..l
rcu: (detected by 0, t=10502 jiffies, g=16905, q=644 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 7997 Comm: syz.1.725 Not tainted 6.17.0-rc1-syzkaller-00214-g99bade344cfa #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:should_change_schedules net/sched/sch_taprio.c:889 [inline]
RIP: 0010:advance_sched+0x725/0xc90 net/sched/sch_taprio.c:973
Code: f8 48 c7 c7 e0 5e 59 8f 4c 89 fe e8 25 ae 64 fb e9 77 fe ff ff e8 bb 23 25 f8 eb 05 e8 b4 23 25 f8 4c 8b 3c 24 48 8b 44 24 40 <48> 85 c0 4c 8b 6c 24 18 48 8b 6c 24 28 0f 84 99 00 00 00 48 8d 98
RSP: 0018:ffffc90000a08c70 EFLAGS: 00000006
RAX: 0000000000000000 RBX: 1867670854000000 RCX: ffff88802a071e00
RDX: 0000000000010000 RSI: 0000000004000000 RDI: 0000000000000000
RBP: 0000000000000001 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff5200014117c R12: dffffc0000000000
R13: ffff8880521834c8 R14: ffff888052183408 R15: ffff888052183c00
FS: 0000000000000000(0000) GS:ffff888125d1b000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c3e28d9 CR3: 000000000df36000 CR4: 0000000000350ef0
Call Trace:
__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+0x10b/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:folio_test_anon include/linux/page-flags.h:723 [inline]
RIP: 0010:zap_present_folio_ptes mm/memory.c:1498 [inline]
RIP: 0010:zap_present_ptes mm/memory.c:1581 [inline]
RIP: 0010:do_zap_pte_range mm/memory.c:1682 [inline]
RIP: 0010:zap_pte_range mm/memory.c:1726 [inline]
RIP: 0010:zap_pmd_range mm/memory.c:1818 [inline]
RIP: 0010:zap_pud_range mm/memory.c:1847 [inline]
RIP: 0010:zap_p4d_range mm/memory.c:1868 [inline]
RIP: 0010:unmap_page_range+0x1670/0x4370 mm/memory.c:1889
Code: ef e8 54 cb 19 00 49 8b 45 00 48 89 44 24 78 4d 8d 66 18 4d 89 e5 49 c1 ed 03 48 b8 00 00 00 00 00 fc ff df 41 80 7c 05 00 00 <74> 08 4c 89 e7 e8 26 cb 19 00 49 8b 1c 24 83 e3 01 31 ff 48 89 de
RSP: 0018:ffffc90003b8f5e0 EFLAGS: 00000246
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffff88802a071e00 RSI: 0000000000000011 RDI: 0000000000000001
RBP: ffffc90003b8f890 R08: ffffea0001648907 R09: 1ffffd40002c9120
R10: dffffc0000000000 R11: fffff940002c9121 R12: ffffea0001648918
R13: 1ffffd40002c9123 R14: ffffea0001648900 R15: 0000000000000011
unmap_single_vma mm/memory.c:1932 [inline]
unmap_vmas+0x399/0x580 mm/memory.c:1976
exit_mmap+0x248/0xb50 mm/mmap.c:1280
__mmput+0x118/0x420 kernel/fork.c:1130
exit_mm+0x1da/0x2c0 kernel/exit.c:582
do_exit+0x648/0x2300 kernel/exit.c:949
do_group_exit+0x21c/0x2d0 kernel/exit.c:1102
__do_sys_exit_group kernel/exit.c:1113 [inline]
__se_sys_exit_group kernel/exit.c:1111 [inline]
__x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1111
x64_sys_call+0x21f7/0x2200 arch/x86/include/generated/asm/syscalls_64.h:232
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: 0033:0x7fe97038ebe9
Code: Unable to access opcode bytes at 0x7fe97038ebbf.
RSP: 002b:00007ffe19049058 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fe97038ebe9
RDX: 0000000000000064 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007ffe190490bc R08: 000000041904914f R09: 00000000000927c0
R10: 0000000000000001 R11: 0000000000000246 R12: 0000000000000078
R13: 00000000000927c0 R14: 000000000001e98c R15: 00007ffe19049110
task:syz-executor state:R running task stack:21960 pid:5866 tgid:5866 ppid:5849 task_flags:0x400140 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5357 [inline]
__schedule+0x1798/0x4cc0 kernel/sched/core.c:6961
preempt_schedule_irq+0xb5/0x150 kernel/sched/core.c:7288
irqentry_exit+0x6f/0x90 kernel/entry/common.c:197
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:__orc_find arch/x86/kernel/unwind_orc.c:100 [inline]
RIP: 0010:orc_find arch/x86/kernel/unwind_orc.c:227 [inline]
RIP: 0010:unwind_next_frame+0x12e3/0x2390 arch/x86/kernel/unwind_orc.c:494
Code: 18 48 8b 10 48 c7 c7 80 3c 88 8b 89 de e8 15 cd b4 ff e9 43 06 00 00 49 89 d5 48 89 d5 48 89 d8 48 29 e8 48 89 c1 48 c1 f9 02 <48> c1 e8 3f 48 01 c8 48 83 e0 fe 4c 8d 3c 45 00 00 00 00 49 01 ef
RSP: 0018:ffffc90002e66e38 EFLAGS: 00000256
RAX: 0000000000000000 RBX: ffffffff8fbf07f4 RCX: 0000000000000000
RDX: ffffffff8fbf07f4 RSI: ffffffff903ed530 RDI: ffffffff8be334a0
RBP: ffffffff8fbf07f4 R08: 0000000000000001 R09: 0000000000000000
R10: dffffc0000000000 R11: ffffffff81ac3870 R12: ffffffff820c0590
R13: ffffffff8fbf07f4 R14: ffffc90002e66f08 R15: 0000000000010c05
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:330 [inline]
__kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:356
kasan_slab_alloc include/linux/kasan.h:250 [inline]
slab_post_alloc_hook mm/slub.c:4180 [inline]
slab_alloc_node mm/slub.c:4229 [inline]
kmem_cache_alloc_noprof+0x1c1/0x3c0 mm/slub.c:4236
ptlock_alloc+0x20/0x70 mm/memory.c:7161
ptlock_init include/linux/mm.h:2953 [inline]
pagetable_pte_ctor include/linux/mm.h:3002 [inline]
__pte_alloc_one_noprof include/asm-generic/pgalloc.h:78 [inline]
pte_alloc_one+0x7d/0x170 arch/x86/mm/pgtable.c:18
__pte_alloc+0x25/0x1a0 mm/memory.c:452
copy_pte_range mm/memory.c:1107 [inline]
copy_pmd_range+0x6a91/0x71d0 mm/memory.c:1261
copy_pud_range mm/memory.c:1298 [inline]
copy_p4d_range mm/memory.c:1322 [inline]
copy_page_range+0xc14/0x1270 mm/memory.c:1410
dup_mmap+0xf57/0x1ac0 mm/mmap.c:1834
dup_mm kernel/fork.c:1485 [inline]
copy_mm+0x13c/0x4b0 kernel/fork.c:1537
copy_process+0x1706/0x3c00 kernel/fork.c:2175
kernel_clone+0x21e/0x840 kernel/fork.c:2605
__do_sys_clone kernel/fork.c:2748 [inline]
__se_sys_clone kernel/fork.c:2732 [inline]
__x64_sys_clone+0x18b/0x1e0 kernel/fork.c:2732
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: 0033:0x7f2c60185453
RSP: 002b:00007ffeba248958 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f2c60185453
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000001
R10: 00005555865167d0 R11: 0000000000000246 R12: 0000000000000000
R13: 00000000000927c0 R14: 000000000001e9a4 R15: 00007ffeba248af0
rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g16905 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: Possible timer handling issue on cpu=1 timer-softirq=8810
rcu: rcu_preempt kthread starved for 10502 jiffies! g16905 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I stack:27856 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+0x711/0x8a0 kernel/kthread.c:463
ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245