rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 1-...!: (0 ticks this GP) idle=1b54/1/0x4000000000000000 softirq=30355/30355 fqs=0
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P8029/1:b..l
rcu: (detected by 0, t=10505 jiffies, g=24017, q=253 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 8059 Comm: syz.2.674 Not tainted 6.15.0-next-20250530-syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:advance_sched+0x4ea/0xc90 net/sched/sch_taprio.c:-1
Code: 89 44 24 08 48 8b 03 49 39 c7 49 0f 4c c7 48 89 44 24 20 0f b7 f5 31 ff e8 c3 c1 3a f8 66 85 ed 0f 8e 31 02 00 00 48 8b 04 24 <48> 05 30 01 00 00 4d 8d 6e 80 48 ff cd 45 31 ff 48 89 44 24 50 48
RSP: 0018:ffffc90000a08c70 EFLAGS: 00000002
RAX: ffff88807bfaa800 RBX: ffff88807bfaa928 RCX: 0000000000010000
RDX: ffff8880278b5a00 RSI: 0000000000000002 RDI: 0000000000000000
RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff5200014117c R12: dffffc0000000000
R13: ffff888034757000 R14: ffff88807bfa8940 R15: 184d0de048000000
FS: 0000000000000000(0000) GS:ffff888125d53000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c30017a CR3: 000000000df38000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
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+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:page_ext_next include/linux/page_ext.h:108 [inline]
RIP: 0010:page_ext_iter_next include/linux/page_ext.h:156 [inline]
RIP: 0010:page_table_check_clear+0x3cc/0x700 mm/page_table_check.c:78
Code: ff 7f 00 00 31 ff e8 c3 5d 91 ff 4c 89 f0 48 25 ff 7f 00 00 74 2f e8 d3 58 91 ff 48 b8 00 00 00 00 00 fc ff df 48 8b 4c 24 10 <80> 3c 01 00 74 0c 48 c7 c7 a0 32 af 99 e8 e2 db f4 ff 48 03 2d 9b
RSP: 0018:ffffc9001c13f350 EFLAGS: 00000293
RAX: dffffc0000000000 RBX: 000000000005d6c8 RCX: 1ffffffff335e654
RDX: 0000000000000000 RSI: 00000000000056c9 RDI: 0000000000000000
RBP: ffff88801d5b1e80 R08: ffff88801d5b1ecf R09: 1ffff11003ab63d9
R10: dffffc0000000000 R11: ffffed1003ab63da R12: 0000000000000000
R13: 0000000000000001 R14: 000000000005d6c9 R15: ffff88801d5b1ec8
ptep_get_and_clear_full arch/x86/include/asm/jump_label.h:-1 [inline]
get_and_clear_full_ptes include/linux/pgtable.h:714 [inline]
zap_present_folio_ptes mm/memory.c:1505 [inline]
zap_present_ptes mm/memory.c:1590 [inline]
do_zap_pte_range mm/memory.c:1691 [inline]
zap_pte_range mm/memory.c:1735 [inline]
zap_pmd_range mm/memory.c:1827 [inline]
zap_pud_range mm/memory.c:1856 [inline]
zap_p4d_range mm/memory.c:1877 [inline]
unmap_page_range+0x3249/0x41c0 mm/memory.c:1898
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
get_signal+0x1286/0x1340 kernel/signal.c:3034
arch_do_signal_or_restart+0x9a/0x750 arch/x86/kernel/signal.c:337
exit_to_user_mode_loop+0x75/0x110 kernel/entry/common.c:111
exit_to_user_mode_prepare include/linux/entry-common.h:330 [inline]
syscall_exit_to_user_mode_work include/linux/entry-common.h:414 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:449 [inline]
do_syscall_64+0x2bd/0x3b0 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7feb0338e969
Code: Unable to access opcode bytes at 0x7feb0338e93f.
RSP: 002b:00007feb042760e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: 0000000000000001 RBX: 00007feb035b5fa8 RCX: 00007feb0338e969
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007feb035b5fac
RBP: 00007feb035b5fa0 R08: 7fffffffffffffff R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 00007feb035b5fac
R13: 0000000000000000 R14: 00007ffe9fdd5d90 R15: 00007ffe9fdd5e78
task:syz.0.666 state:R running task stack:25576 pid:8029 tgid:8028 ppid:5847 task_flags:0x40044c flags:0x00004006
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:lock_acquire+0x175/0x360 kernel/locking/lockdep.c:5875
Code: 00 00 00 00 9c 8f 44 24 30 f7 44 24 30 00 02 00 00 0f 85 cd 00 00 00 f7 44 24 08 00 02 00 00 74 01 fb 65 48 8b 05 3b 9a fe 10 <48> 3b 44 24 58 0f 85 f2 00 00 00 48 83 c4 60 5b 41 5c 41 5d 41 5e
RSP: 0018:ffffc9000ed26fe8 EFLAGS: 00000206
RAX: ea3659e73545d300 RBX: 0000000000000000 RCX: ea3659e73545d300
RDX: 0000000000000001 RSI: ffffffff8db6f931 RDI: ffffffff8be29c80
RBP: ffffffff822c8be9 R08: 0000000000000000 R09: ffffffff822c8be9
R10: dffffc0000000000 R11: fffff94000285821 R12: 0000000000000002
R13: ffffffff8e13f140 R14: 0000000000000000 R15: 0000000000000246
rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
rcu_read_lock include/linux/rcupdate.h:841 [inline]
percpu_ref_put_many include/linux/percpu-refcount.h:330 [inline]
percpu_ref_put+0x35/0x180 include/linux/percpu-refcount.h:351
__mem_cgroup_uncharge_folios+0xf0/0x1c0 mm/memcontrol.c:4972
mem_cgroup_uncharge_folios include/linux/memcontrol.h:680 [inline]
folios_put_refs+0x551/0x640 mm/swap.c:991
folio_batch_release include/linux/pagevec.h:101 [inline]
shmem_undo_range+0x49e/0x14b0 mm/shmem.c:1125
shmem_truncate_range mm/shmem.c:1237 [inline]
shmem_evict_inode+0x272/0xa70 mm/shmem.c:1365
evict+0x504/0x9c0 fs/inode.c:810
__dentry_kill+0x209/0x660 fs/dcache.c:669
dput+0x19f/0x2b0 fs/dcache.c:911
__fput+0x68e/0xa70 fs/file_table.c:475
task_work_run+0x1d1/0x260 kernel/task_work.c:227
exit_task_work include/linux/task_work.h:40 [inline]
do_exit+0x6ad/0x22e0 kernel/exit.c:955
do_group_exit+0x21c/0x2d0 kernel/exit.c:1104
get_signal+0x1286/0x1340 kernel/signal.c:3034
arch_do_signal_or_restart+0x9a/0x750 arch/x86/kernel/signal.c:337
exit_to_user_mode_loop+0x75/0x110 kernel/entry/common.c:111
exit_to_user_mode_prepare include/linux/entry-common.h:330 [inline]
syscall_exit_to_user_mode_work include/linux/entry-common.h:414 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:449 [inline]
do_syscall_64+0x2bd/0x3b0 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f60fa98d41f
RSP: 002b:00007f60fb7d4df0 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
RAX: 0000000000fde000 RBX: 0000000001000000 RCX: 00007f60fa98d41f
RDX: 0000000001000000 RSI: 00007f60f0200000 RDI: 0000000000000003
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000005f1d
R10: 000000000000076e R11: 0000000000000293 R12: 0000000000000003
R13: 00007f60fb7d4ef0 R14: 00007f60fb7d4eb0 R15: 00007f60f0200000
rcu: rcu_preempt kthread timer wakeup didn't happen for 10504 jiffies! g24017 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: Possible timer handling issue on cpu=1 timer-softirq=16696
rcu: rcu_preempt kthread starved for 10505 jiffies! g24017 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:27128 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