rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P8963/1:b..l
(detected by 1, t=10503 jiffies, g=29909, q=20)
task:syz.2.1547 state:R running task stack:26512 pid: 8963 ppid: 4190 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5049 [inline]
__schedule+0x11c3/0x4350 kernel/sched/core.c:6395
preempt_schedule_irq+0xbb/0x160 kernel/sched/core.c:6799
irqentry_exit+0x63/0x70 kernel/entry/common.c:435
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:constant_test_bit arch/x86/include/asm/bitops.h:207 [inline]
RIP: 0010:test_bit include/asm-generic/bitops/instrumented-non-atomic.h:135 [inline]
RIP: 0010:test_ti_thread_flag include/linux/thread_info.h:118 [inline]
RIP: 0010:need_resched include/linux/sched.h:2126 [inline]
RIP: 0010:bpf_test_timer_continue+0x112/0x380 net/bpf/test_run.c:73
Code: 1b 4f f9 48 83 e5 04 0f 85 f0 00 00 00 4c 89 e7 be 08 00 00 00 e8 ee 60 94 f9 48 b8 00 00 00 00 00 fc ff df 41 80 7c 05 00 00 <74> 08 4c 89 e7 e8 44 5f 94 f9 49 8b 1c 24 48 89 de 48 83 e6 08 31
RSP: 0018:ffffc900045bfac0 EFLAGS: 00000246
RAX: dffffc0000000000 RBX: 1ffff920008b7f75 RCX: ffffffff882a1662
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff88802cae8000
RBP: 0000000000000000 R08: ffff88802cae8007 R09: 1ffff1100595d000
R10: dffffc0000000000 R11: ffffed100595d001 R12: ffff88802cae8000
R13: 1ffff1100595d000 R14: ffffc900045bfba8 R15: ffffc900045bfbac
bpf_test_run+0x3a7/0x800 net/bpf/test_run.c:120
bpf_prog_test_run_skb+0x9fb/0x1190 net/bpf/test_run.c:678
bpf_prog_test_run+0x31c/0x390 kernel/bpf/syscall.c:3374
__sys_bpf+0x5a5/0x6f0 kernel/bpf/syscall.c:4675
__do_sys_bpf kernel/bpf/syscall.c:4761 [inline]
__se_sys_bpf kernel/bpf/syscall.c:4759 [inline]
__x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:4759
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f8464ecab19
RSP: 002b:00007f8463121028 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f8465150fa0 RCX: 00007f8464ecab19
RDX: 0000000000000048 RSI: 00002000000013c0 RDI: 000000000000000a
RBP: 00007f8464f62af8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f8465151038 R14: 00007f8465150fa0 R15: 00007ffc41f9d848
rcu: rcu_preempt kthread timer wakeup didn't happen for 10502 jiffies! g29909 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: Possible timer handling issue on cpu=0 timer-softirq=12486
rcu: rcu_preempt kthread starved for 10503 jiffies! g29909 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I stack:28080 pid: 15 ppid: 2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5049 [inline]
__schedule+0x11c3/0x4350 kernel/sched/core.c:6395
schedule+0x11b/0x1e0 kernel/sched/core.c:6478
schedule_timeout+0x184/0x2d0 kernel/time/timer.c:2117
rcu_gp_fqs_loop+0x2be/0x11f0 kernel/rcu/tree.c:1972
rcu_gp_kthread+0x9a/0x370 kernel/rcu/tree.c:2145
kthread+0x42e/0x520 kernel/kthread.c:334
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 8953 Comm: syz.6.1544 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/15/2026
RIP: 0010:__kasan_check_read+0x6/0x10 mm/kasan/shadow.c:31
Code: 41 5f 5d c3 48 c7 c7 cb 06 e2 8b eb 0a 48 c7 c7 59 c5 c7 8b 48 89 de e8 68 5b 00 08 31 ed eb d7 00 00 cc cc 89 f6 48 8b 0c 24 <31> d2 e9 43 ef ff ff 0f 1f 00 89 f6 48 8b 0c 24 ba 01 00 00 00 e9
RSP: 0018:ffffc900000078b8 EFLAGS: 00000046
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff815d0055
RDX: dffffc0000000000 RSI: 0000000000000008 RDI: ffffffff910470c0
RBP: ffffc90000007b08 R08: ffffffff910470c7 R09: 1ffffffff2208e18
R10: dffffc0000000000 R11: fffffbfff2208e19 R12: ffff88802c73a894
R13: ffff88802c739dc0 R14: 0000000000000002 R15: ffff88802c73a948
FS: 0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055a42a8b2950 CR3: 0000000064ca4000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
instrument_atomic_read include/linux/instrumented.h:71 [inline]
test_bit include/asm-generic/bitops/instrumented-non-atomic.h:134 [inline]
hlock_class kernel/locking/lockdep.c:197 [inline]
check_wait_context kernel/locking/lockdep.c:4760 [inline]
__lock_acquire+0x705/0x7d40 kernel/locking/lockdep.c:5070
lock_acquire+0x19f/0x400 kernel/locking/lockdep.c:5737
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0xb0/0x100 kernel/locking/spinlock.c:162
debug_object_deactivate+0x63/0x380 lib/debugobjects.c:757
debug_hrtimer_deactivate kernel/time/hrtimer.c:415 [inline]
__run_hrtimer kernel/time/hrtimer.c:1653 [inline]
__hrtimer_run_queues+0x2c0/0xb60 kernel/time/hrtimer.c:1749
hrtimer_interrupt+0x397/0x8b0 kernel/time/hrtimer.c:1811
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1097 [inline]
__sysvec_apic_timer_interrupt+0x137/0x4a0 arch/x86/kernel/apic/apic.c:1114
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline]
sysvec_apic_timer_interrupt+0x9b/0xc0 arch/x86/kernel/apic/apic.c:1108
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:lock_acquire+0x209/0x400 kernel/locking/lockdep.c:5741
Code: f7 84 24 80 00 00 00 00 02 00 00 43 c6 44 3c 04 f8 0f 85 f0 00 00 00 41 f7 c6 00 02 00 00 74 01 fb 48 c7 44 24 60 0e 36 e0 45 <4b> c7 04 3c 00 00 00 00 43 c7 44 3c 08 00 00 00 00 65 48 8b 04 25
RSP: 0018:ffffc900041af2a0 EFLAGS: 00000206
RAX: 0000000000000001 RBX: 0000000000000000 RCX: e9b8e342c218ca00
RDX: 0000000000000000 RSI: ffffffff8a2b3e00 RDI: ffffffff8a7a5100
RBP: ffffc900041af3c0 R08: dffffc0000000000 R09: 1ffffffff2208e18
R10: dffffc0000000000 R11: fffffbfff2208e19 R12: 1ffff92000835e60
R13: ffffffff8d11efa0 R14: 0000000000000246 R15: dffffc0000000000
rcu_lock_acquire+0x20/0x30 include/linux/rcupdate.h:313
rcu_read_lock include/linux/rcupdate.h:740 [inline]
lock_page_memcg+0xa5/0x440 mm/memcontrol.c:2047
page_remove_rmap+0x2a/0x10f0 mm/rmap.c:1355
zap_pte_range mm/memory.c:1384 [inline]
zap_pmd_range mm/memory.c:1505 [inline]
zap_pud_range mm/memory.c:1534 [inline]
zap_p4d_range mm/memory.c:1555 [inline]
unmap_page_range+0xee4/0x2410 mm/memory.c:1576
unmap_vmas+0x131/0x250 mm/memory.c:1653
exit_mmap+0x3b9/0x640 mm/mmap.c:3224
__mmput+0x115/0x390 kernel/fork.c:1136
exit_mm+0x632/0x7b0 kernel/exit.c:557
do_exit+0x5b8/0x2100 kernel/exit.c:877
do_group_exit+0x12c/0x2f0 kernel/exit.c:1004
get_signal+0x7eb/0x12e0 kernel/signal.c:2917
arch_do_signal_or_restart+0xe6/0x12a0 arch/x86/kernel/signal.c:867
handle_signal_work kernel/entry/common.c:157 [inline]
exit_to_user_mode_loop+0x9e/0x130 kernel/entry/common.c:181
exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:217
__syscall_exit_to_user_mode_work kernel/entry/common.c:299 [inline]
syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:310
do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:86
entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f932c781b19
Code: Unable to access opcode bytes at RIP 0x7f932c781aef.
RSP: 002b:00007f932a9d80e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007f932ca07fa8 RCX: 00007f932c781b19
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f932ca07fa8
RBP: 00007f932ca07fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f932ca08038 R14: 00007ffe90f25c80 R15: 00007ffe90f25d68