rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 1-...!: (1 ticks this GP) idle=f49c/1/0x4000000000000000 softirq=100337/100337 fqs=0
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P23962/1:b..l
rcu: (detected by 0, t=10502 jiffies, g=75485, q=515 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 8391 Comm: syz-executor Not tainted 6.12.0-rc7-syzkaller-00212-g4a5df3796467 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024
RIP: 0010:lock_acquire+0xa/0x550 kernel/locking/lockdep.c:5793
Code: 0f 95 c0 c3 cc cc cc cc 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 55 48 89 e5 41 57 <41> 56 41 55 41 54 53 48 83 e4 e0 48 81 ec 20 01 00 00 4c 89 4c 24
RSP: 0018:ffffc90000a18ca0 EFLAGS: 00000046
RAX: 0000000000010004 RBX: 1ffff9200014319c RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8880b872c898
RBP: ffffc90000a18ca8 R08: 0000000000000001 R09: 0000000000000000
R10: dffffc0000000000 R11: fffffbfff2037c0e R12: ffff8880b872c880
R13: 1ffff92000143198 R14: ffffc90000a18ce0 R15: dffffc0000000000
FS: 000055556a666500(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f03802656c0 CR3: 000000006d23e000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
__raw_spin_lock_irq include/linux/spinlock_api_smp.h:119 [inline]
_raw_spin_lock_irq+0xd3/0x120 kernel/locking/spinlock.c:170
__run_hrtimer kernel/time/hrtimer.c:1695 [inline]
__hrtimer_run_queues+0x670/0xd50 kernel/time/hrtimer.c:1755
hrtimer_interrupt+0x396/0x990 kernel/time/hrtimer.c:1817
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1038 [inline]
__sysvec_apic_timer_interrupt+0x110/0x420 arch/x86/kernel/apic/apic.c:1055
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1049
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:lock_acquire+0x264/0x550 kernel/locking/lockdep.c:5829
Code: 2b 00 74 08 4c 89 f7 e8 8a 4b 8b 00 f6 44 24 61 02 0f 85 85 01 00 00 41 f7 c7 00 02 00 00 74 01 fb 48 c7 44 24 40 0e 36 e0 45 <4b> c7 44 25 00 00 00 00 00 43 c7 44 25 09 00 00 00 00 43 c7 44 25
RSP: 0018:ffffc900030a7060 EFLAGS: 00000206
RAX: 0000000000000001 RBX: 1ffff92000614e18 RCX: c509263f2df0a300
RDX: dffffc0000000000 RSI: ffffffff8c0adc40 RDI: ffffffff8c6038e0
RBP: ffffc900030a71b0 R08: ffffffff9429a807 R09: 1ffffffff2853500
R10: dffffc0000000000 R11: fffffbfff2853501 R12: 1ffff92000614e14
R13: dffffc0000000000 R14: ffffc900030a70c0 R15: 0000000000000246
rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
rcu_read_lock_sched include/linux/rcupdate.h:941 [inline]
pfn_valid+0x113/0x450 include/linux/mmzone.h:2043
page_table_check_set+0x22/0x540 mm/page_table_check.c:110
__page_table_check_ptes_set+0x30f/0x410 mm/page_table_check.c:225
page_table_check_ptes_set include/linux/page_table_check.h:74 [inline]
set_ptes include/linux/pgtable.h:267 [inline]
__copy_present_ptes mm/memory.c:969 [inline]
copy_present_ptes mm/memory.c:1052 [inline]
copy_pte_range mm/memory.c:1167 [inline]
copy_pmd_range+0x4773/0x85f0 mm/memory.c:1255
copy_pud_range mm/memory.c:1292 [inline]
copy_p4d_range mm/memory.c:1316 [inline]
copy_page_range+0x99f/0xe90 mm/memory.c:1414
dup_mmap kernel/fork.c:746 [inline]
dup_mm kernel/fork.c:1675 [inline]
copy_mm+0x1117/0x1e80 kernel/fork.c:1724
copy_process+0x1845/0x3d50 kernel/fork.c:2374
kernel_clone+0x223/0x880 kernel/fork.c:2786
__do_sys_clone kernel/fork.c:2929 [inline]
__se_sys_clone kernel/fork.c:2913 [inline]
__x64_sys_clone+0x258/0x2a0 kernel/fork.c:2913
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f037f574f93
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:00007ffee3ef0d58 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f037f574f93
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000
R10: 000055556a6667d0 R11: 0000000000000246 R12: 0000000000000000
R13: 00000000001c820d R14: 00000000001c7fa7 R15: 00007ffee3ef0ee0
task:syz.6.3821 state:R running task stack:23488 pid:23962 tgid:23961 ppid:9131 flags:0x00004006
Call Trace:
context_switch kernel/sched/core.c:5328 [inline]
__schedule+0x17fa/0x4bd0 kernel/sched/core.c:6693
preempt_schedule_common+0x84/0xd0 kernel/sched/core.c:6872
preempt_schedule+0xe1/0xf0 kernel/sched/core.c:6896
preempt_schedule_thunk+0x1a/0x30 arch/x86/entry/thunk.S:12
__raw_spin_unlock include/linux/spinlock_api_smp.h:143 [inline]
_raw_spin_unlock+0x3e/0x50 kernel/locking/spinlock.c:186
spin_unlock include/linux/spinlock.h:391 [inline]
zap_pte_range mm/memory.c:1691 [inline]
zap_pmd_range mm/memory.c:1739 [inline]
zap_pud_range mm/memory.c:1768 [inline]
zap_p4d_range mm/memory.c:1789 [inline]
unmap_page_range+0x36b1/0x40e0 mm/memory.c:1810
unmap_vmas+0x3cc/0x5f0 mm/memory.c:1900
exit_mmap+0x275/0xc40 mm/mmap.c:1923
__mmput+0x115/0x380 kernel/fork.c:1348
exit_mm+0x220/0x310 kernel/exit.c:571
do_exit+0x9b2/0x28e0 kernel/exit.c:926
do_group_exit+0x207/0x2c0 kernel/exit.c:1088
get_signal+0x16a3/0x1740 kernel/signal.c:2918
arch_do_signal_or_restart+0x96/0x860 arch/x86/kernel/signal.c:337
exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
__syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
syscall_exit_to_user_mode+0xc9/0x370 kernel/entry/common.c:218
do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc80fd7e719
RSP: 002b:00007fc810c08038 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: 0000000020000000 RBX: 00007fc80ff35f80 RCX: 00007fc80fd7e719
RDX: b635773f06ebbeee RSI: 0000000000b36000 RDI: 0000000020000000
RBP: 00007fc80fdf175e R08: ffffffffffffffff R09: 0000000000000000
R10: 0000000000008031 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000001 R14: 00007fc80ff35f80 R15: 00007ffe858d76e8
rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g75485 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: Possible timer handling issue on cpu=1 timer-softirq=135510
rcu: rcu_preempt kthread starved for 10502 jiffies! g75485 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:25824 pid:17 tgid:17 ppid:2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5328 [inline]
__schedule+0x17fa/0x4bd0 kernel/sched/core.c:6693
__schedule_loop kernel/sched/core.c:6770 [inline]
schedule+0x14b/0x320 kernel/sched/core.c:6785
schedule_timeout+0x1be/0x310 kernel/time/timer.c:2615
rcu_gp_fqs_loop+0x2df/0x1330 kernel/rcu/tree.c:2045
rcu_gp_kthread+0xa7/0x3b0 kernel/rcu/tree.c:2247
kthread+0x2f0/0x390 kernel/kthread.c:389
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244