rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P10123/1:b..l
(detected by 1, t=10502 jiffies, g=36565, q=1193)
task:syz.4.1233 state:R running task stack:25312 pid:10123 ppid: 4193 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5049 [inline]
__schedule+0x11bb/0x4390 kernel/sched/core.c:6395
preempt_schedule_irq+0xb1/0x150 kernel/sched/core.c:6799
irqentry_exit+0x63/0x70 kernel/entry/common.c:432
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:__cant_migrate+0x86/0x2e0 kernel/sched/core.c:9696
Code: f1 00 f2 f2 f2 4b 89 04 2f 66 43 c7 44 2f 09 f3 f3 43 c6 44 2f 0b f3 48 c7 44 24 60 00 00 00 00 9c 8f 44 24 60 f6 44 24 61 02 <0f> 84 85 00 00 00 65 48 8b 1d 9c 61 af 7e 4c 8d a3 38 04 00 00 4d
RSP: 0018:ffffc9000330f9c0 EFLAGS: 00000202
RAX: f2f2f200f1f1f1f1 RBX: ffffc9000330fc9c RCX: 0000000000080000
RDX: ffffc9000e7ab000 RSI: 0000000000000267 RDI: ffffffff8b0367e0
RBP: ffffc9000330fa90 R08: dffffc0000000000 R09: ffffed1003b64001
R10: ffffed1003b64001 R11: 1ffff11003b64000 R12: ffffc9000330fc98
R13: dffffc0000000000 R14: dffffc0000000000 R15: 1ffff92000661f3c
__bpf_prog_run include/linux/filter.h:615 [inline]
bpf_prog_run_xdp include/linux/filter.h:810 [inline]
bpf_test_run+0x31f/0x7d0 net/bpf/test_run.c:117
bpf_prog_test_run_xdp+0x3fc/0x920 net/bpf/test_run.c:812
bpf_prog_test_run+0x31e/0x390 kernel/bpf/syscall.c:3374
__sys_bpf+0x535/0x670 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: 0033:0x7f48dd698ba9
RSP: 002b:00007f48db900038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f48dd8dffa0 RCX: 00007f48dd698ba9
RDX: 0000000000000050 RSI: 0000200000000240 RDI: 000000000000000a
RBP: 00007f48dd71be19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f48dd8e0038 R14: 00007f48dd8dffa0 R15: 00007ffec39cd048
rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g36565 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: Possible timer handling issue on cpu=0 timer-softirq=22682
rcu: rcu_preempt kthread starved for 10502 jiffies! g36565 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:27776 pid: 15 ppid: 2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5049 [inline]
__schedule+0x11bb/0x4390 kernel/sched/core.c:6395
schedule+0x11b/0x1e0 kernel/sched/core.c:6478
schedule_timeout+0x15c/0x280 kernel/time/timer.c:1914
rcu_gp_fqs_loop+0x29e/0x11b0 kernel/rcu/tree.c:1972
rcu_gp_kthread+0x98/0x350 kernel/rcu/tree.c:2145
kthread+0x436/0x520 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: 10118 Comm: rm Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:irq_work_queue_on+0x180/0x220 kernel/irq_work.c:115
Code: ff bf 01 00 00 00 e8 1f df cd ff 65 8b 1d 00 dd 7e 7e 31 ff 89 de e8 af 3b f4 ff 85 db 74 2e e8 46 38 f4 ff 45 85 f6 0f 94 c0 <5b> 41 5c 41 5d 41 5e 41 5f 5d c3 e8 30 38 f4 ff 0f 0b e9 97 fe ff
RSP: 0018:ffffc9000320efa8 EFLAGS: 00000046
RAX: ffffffff81839201 RBX: 0000000000000002 RCX: ffff88802626bb80
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000000
RBP: 0000000000000000 R08: dffffc0000000000 R09: ffffed10172067af
R10: ffffed10172067af R11: 1ffff110172067ae R12: 0000000000000000
R13: dffffc0000000001 R14: 0000000000000000 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b32523ffc CR3: 000000000be8e000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
rcu_read_unlock_special+0x379/0x480 kernel/rcu/tree_plugin.h:667
__rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:422
rcu_read_unlock include/linux/rcupdate.h:771 [inline]
__perf_event_output kernel/events/core.c:7813 [inline]
perf_event_output_forward+0x216/0x280 kernel/events/core.c:7822
__perf_event_overflow+0x364/0x530 kernel/events/core.c:9515
perf_tp_event+0x32c/0xb50 kernel/events/core.c:10047
perf_trace_run_bpf_submit+0xf3/0x1c0 kernel/events/core.c:10021
perf_trace_preemptirq_template+0x2be/0x380 include/trace/events/preemptirq.h:14
trace_irq_enable_rcuidle+0x108/0x180 include/trace/events/preemptirq.h:40
trace_hardirqs_on+0x57/0x80 kernel/trace/trace_preemptirq.c:44
asm_sysvec_irq_work+0x16/0x20 arch/x86/include/asm/idtentry.h:713
RIP: 0010:rcu_read_unlock_special+0x84/0x480 kernel/rcu/tree_plugin.h:674
Code: f1 f1 f1 00 f2 f2 f2 4a 89 04 2b 66 42 c7 44 2b 09 f3 f3 42 c6 44 2b 0b f3 65 44 8b 35 ad 13 9e 7e 41 f7 c6 00 00 f0 00 74 45 <48> c7 44 24 20 0e 36 e0 45 4a c7 04 2b 00 00 00 00 66 42 c7 44 2b
RSP: 0018:ffffc9000320f760 EFLAGS: 00000206
RAX: 0df48f4986ca1600 RBX: 1ffff92000641ef0 RCX: 0df48f4986ca1600
RDX: dffffc0000000000 RSI: ffffffff8a0b1820 RDI: ffffffff8a59a480
RBP: ffffc9000320f830 R08: dffffc0000000000 R09: fffffbfff1ff7819
R10: fffffbfff1ff7819 R11: 1ffffffff1ff7818 R12: ffffffff8c120b00
R13: dffffc0000000000 R14: 0000000000000246 R15: 0000000000000001
__rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:422
rcu_read_unlock include/linux/rcupdate.h:771 [inline]
__unlock_page_memcg+0xea/0x100 mm/memcontrol.c:2093
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+0xfbc/0x2520 mm/memory.c:1576
unmap_vmas+0x11b/0x230 mm/memory.c:1653
exit_mmap+0x38f/0x5f0 mm/mmap.c:3216
__mmput+0x115/0x3b0 kernel/fork.c:1127
exit_mm+0x567/0x6c0 kernel/exit.c:550
do_exit+0x5a1/0x20a0 kernel/exit.c:870
do_group_exit+0x12e/0x300 kernel/exit.c:997
__do_sys_exit_group kernel/exit.c:1008 [inline]
__se_sys_exit_group kernel/exit.c:1006 [inline]
__x64_sys_exit_group+0x3b/0x40 kernel/exit.c:1006
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: 0033:0x7f9debbaf6c5
Code: Unable to access opcode bytes at RIP 0x7f9debbaf69b.
RSP: 002b:00007ffeedd430c8 EFLAGS: 00000202 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007f9debcb0fe8 RCX: 00007f9debbaf6c5
RDX: 00000000000000e7 RSI: ffffffffffffff88 RDI: 0000000000000000
RBP: 0000000000000001 R08: 00007ffeedd43058 R09: 0000000000000000
R10: 00007ffeedd42ef0 R11: 0000000000000202 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f9debcaf680 R15: 00007f9debcb1000