rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 1-...!: (1 GPs behind) idle=f3bc/1/0x4000000000000000 softirq=57838/57839 fqs=0
rcu: (detected by 0, t=10506 jiffies, g=53177, q=174 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 12680 Comm: syz.9.2467 Not tainted 6.15.0-syzkaller-12058-g64980441d269 #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:get_current arch/x86/include/asm/current.h:25 [inline]
RIP: 0010:write_comp_data kernel/kcov.c:245 [inline]
RIP: 0010:__sanitizer_cov_trace_const_cmp8+0x8/0x90 kernel/kcov.c:321
Code: 48 89 44 11 20 e9 73 e0 4f ff cc 0f 1f 80 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 48 8b 04 24 <65> 48 8b 0c 25 08 b0 9c 92 65 8b 15 68 4f dc 10 81 e2 00 01 ff 00
RSP: 0018:ffffc90000a08bf8 EFLAGS: 00000046
RAX: ffffffff898571a2 RBX: 0000000000000000 RCX: 0000000000010000
RDX: ffff88807d838000 RSI: 0000000000000000 RDI: 0000000000000010
RBP: 0000000000000000 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff5200014117c R12: 0000000000000000
R13: ffff888029cc72e0 R14: ffff88804de59d30 R15: ffff88804de5a400
FS: 0000000000000000(0000) GS:ffff888125d55000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c2bc900 CR3: 000000000df38000 CR4: 0000000000350ef0
Call Trace:
taprio_set_budgets+0x122/0x3b0 net/sched/sch_taprio.c:666
advance_sched+0x963/0xc90 net/sched/sch_taprio.c:977
__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:const_folio_flags include/linux/page-flags.h:347 [inline]
RIP: 0010:folio_test_head include/linux/page-flags.h:867 [inline]
RIP: 0010:folio_test_large include/linux/page-flags.h:888 [inline]
RIP: 0010:folio_mapcount include/linux/mm.h:1139 [inline]
RIP: 0010:zap_present_folio_ptes mm/memory.c:1531 [inline]
RIP: 0010:zap_present_ptes mm/memory.c:1590 [inline]
RIP: 0010:do_zap_pte_range mm/memory.c:1691 [inline]
RIP: 0010:zap_pte_range mm/memory.c:1735 [inline]
RIP: 0010:zap_pmd_range mm/memory.c:1827 [inline]
RIP: 0010:zap_pud_range mm/memory.c:1856 [inline]
RIP: 0010:zap_p4d_range mm/memory.c:1877 [inline]
RIP: 0010:unmap_page_range+0x1e61/0x41c0 mm/memory.c:1898
Code: 00 4c 89 64 24 10 48 8b 7c 24 48 48 8b b4 24 80 00 00 00 ba 01 00 00 00 48 8b 4c 24 60 e8 77 9a 07 00 48 8b 84 24 10 01 00 00 <42> 80 3c 28 00 48 8b 9c 24 18 01 00 00 74 08 48 89 df e8 18 a8 19
RSP: 0018:ffffc9000ef075e0 EFLAGS: 00000282
RAX: 1ffffd40002dd741 RBX: ffff888047ef8a88 RCX: ffff88807d838000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc9000ef07890 R08: ffffea00016eba33 R09: 1ffffd40002dd746
R10: dffffc0000000000 R11: fffff940002dd747 R12: 800000005bae8007
R13: dffffc0000000000 R14: ffff888047ef8a00 R15: ffffffffffffffff
unmap_single_vma mm/memory.c:1941 [inline]
unmap_vmas+0x399/0x580 mm/memory.c:1985
exit_mmap+0x248/0xb50 mm/mmap.c:1284
__mmput+0x118/0x420 kernel/fork.c:1121
exit_mm+0x1da/0x2c0 kernel/exit.c:581
do_exit+0x640/0x22e0 kernel/exit.c:943
do_group_exit+0x21c/0x2d0 kernel/exit.c:1104
__do_sys_exit_group kernel/exit.c:1115 [inline]
__se_sys_exit_group kernel/exit.c:1113 [inline]
__x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1113
x64_sys_call+0x21ba/0x21c0 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: 0033:0x7ffa6838e929
Code: Unable to access opcode bytes at 0x7ffa6838e8ff.
RSP: 002b:00007ffceaf16f98 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007ffa6838e929
RDX: 0000000000000064 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007ffceaf16ffc R08: 00000004eaf1708f R09: 00000000000927c0
R10: 0000000000000001 R11: 0000000000000246 R12: 000000000000007a
R13: 00000000000927c0 R14: 00000000000559b2 R15: 00007ffceaf17050
rcu: rcu_preempt kthread starved for 10506 jiffies! g53177 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:26504 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+0x711/0x8a0 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: 12677 Comm: syz.4.2466 Not tainted 6.15.0-syzkaller-12058-g64980441d269 #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+0xf6e/0x12d0 kernel/smp.c:885
Code: 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 00 eb e5 44 89
RSP: 0018:ffffc9000396f6e0 EFLAGS: 00000293
RAX: 0000000000000000 RBX: ffff8880b863cb40 RCX: ffff888029350000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc9000396f840 R08: ffffffff8fa100f7 R09: 1ffffffff1f4201e
R10: dffffc0000000000 R11: fffffbfff1f4201f R12: 1ffff110170e828d
R13: dffffc0000000000 R14: 0000000000000001 R15: ffff8880b8741468
FS: 0000000000000000(0000) GS:ffff888125c55000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b31319ff8 CR3: 0000000053ca6000 CR4: 0000000000350ef0
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
tlb_flush arch/x86/include/asm/tlb.h:23 [inline]
tlb_flush_mmu_tlbonly include/asm-generic/tlb.h:490 [inline]
tlb_flush_mmu+0x1a7/0x680 mm/mmu_gather.c:403
tlb_finish_mmu+0xc3/0x1d0 mm/mmu_gather.c:497
exit_mmap+0x44c/0xb50 mm/mmap.c:1297
__mmput+0x118/0x420 kernel/fork.c:1121
exit_mm+0x1da/0x2c0 kernel/exit.c:581
do_exit+0x640/0x22e0 kernel/exit.c:943
do_group_exit+0x21c/0x2d0 kernel/exit.c:1104
__do_sys_exit_group kernel/exit.c:1115 [inline]
__se_sys_exit_group kernel/exit.c:1113 [inline]
__x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1113
x64_sys_call+0x21ba/0x21c0 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: 0033:0x7fa2db78e929
Code: Unable to access opcode bytes at 0x7fa2db78e8ff.
RSP: 002b:00007fffdd0a6928 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fa2db78e929
RDX: 0000000000000064 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007fffdd0a698c R08: 00000004dd0a6a1f R09: 00000000000927c0
R10: 0000000000000001 R11: 0000000000000246 R12: 00000000000000ee
R13: 00000000000927c0 R14: 00000000000559b4 R15: 00007fffdd0a69e0