rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P18155/1:b..l P18156/1:b..l
rcu: (detected by 1, t=10502 jiffies, g=76113, q=330 ncpus=2)
task:syz.4.3300 state:R running task stack:23880 pid:18156 tgid:18156 ppid:18153 task_flags:0x400640 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5357 [inline]
__schedule+0x1798/0x4cc0 kernel/sched/core.c:6961
preempt_schedule_irq+0xb5/0x150 kernel/sched/core.c:7288
irqentry_exit+0x6f/0x90 kernel/entry/common.c:197
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:check_kcov_mode kernel/kcov.c:185 [inline]
RIP: 0010:write_comp_data kernel/kcov.c:246 [inline]
RIP: 0010:__sanitizer_cov_trace_cmp8+0x31/0x90 kernel/kcov.c:294
Code: 24 65 48 8b 0c 25 08 f0 a0 92 65 8b 15 18 28 e1 10 81 e2 00 01 ff 00 74 11 81 fa 00 01 00 00 75 57 83 b9 3c 16 00 00 00 74 4e <8b> 91 18 16 00 00 83 fa 03 75 43 48 8b 91 20 16 00 00 44 8b 89 1c
RSP: 0000:ffffc900054468d8 EFLAGS: 00000246
RAX: ffffffff8b72dccc RBX: 0000000000000001 RCX: ffff888020b83c00
RDX: 0000000000000000 RSI: ffff88807b981c00 RDI: ffff88807b980000
RBP: dffffc0000000000 R08: ffff888020b83c00 R09: 0000000000000004
R10: 0000000000000003 R11: 0000000000000000 R12: 000000110c230000
R13: 000000110e22ffff R14: ffff88807b981c00 R15: ffff88807b980000
ma_dead_node lib/maple_tree.c:576 [inline]
mtree_range_walk+0x57c/0x840 lib/maple_tree.c:2798
mas_state_walk lib/maple_tree.c:3636 [inline]
mt_find+0x23f/0x5f0 lib/maple_tree.c:6933
find_vma+0xe7/0x160 mm/mmap.c:909
gup_vma_lookup mm/gup.c:1293 [inline]
__get_user_pages+0x3c6/0x2ce0 mm/gup.c:1414
__get_user_pages_locked mm/gup.c:1712 [inline]
get_dump_page+0x1ac/0x3f0 mm/gup.c:2212
dump_user_range+0x1de/0xc90 fs/coredump.c:1364
elf_core_dump+0x337b/0x3990 fs/binfmt_elf.c:2085
coredump_write+0x1169/0x1900 fs/coredump.c:1049
vfs_coredump+0x1daa/0x2a50 fs/coredump.c:1168
get_signal+0x1109/0x1340 kernel/signal.c:3019
arch_do_signal_or_restart+0x9a/0x750 arch/x86/kernel/signal.c:337
exit_to_user_mode_loop kernel/entry/common.c:40 [inline]
exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline]
irqentry_exit_to_user_mode+0x81/0x120 kernel/entry/common.c:73
exc_page_fault+0x9f/0xf0 arch/x86/mm/fault.c:1535
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0033:0x7fec8de4f987
RSP: 002b:00007fec8ed36120 EFLAGS: 00010202
RAX: 0000000000000000 RBX: 000000000000000b RCX: 00007fec8df8eec9
RDX: 00007fec8ed36140 RSI: 00007fec8ed36270 RDI: 000000000000000b
RBP: 00007fec8e011f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 00007fec8e1e6038 R14: 00007fec8e1e5fa0 R15: 00007ffdbeee92b8
task:syz.9.3301 state:R running task stack:23680 pid:18155 tgid:18154 ppid:16361 task_flags:0x400140 flags:0x00004002
Call Trace:
context_switch kernel/sched/core.c:5357 [inline]
__schedule+0x1798/0x4cc0 kernel/sched/core.c:6961
preempt_schedule_common+0x83/0xd0 kernel/sched/core.c:7145
preempt_schedule+0xae/0xc0 kernel/sched/core.c:7169
preempt_schedule_thunk+0x16/0x30 arch/x86/entry/thunk.S:12
__local_bh_enable_ip+0x13e/0x1c0 kernel/softirq.c:414
local_bh_enable include/linux/bottom_half.h:33 [inline]
xdp_test_run_batch net/bpf/test_run.c:368 [inline]
bpf_test_run_xdp_live+0x1868/0x1b10 net/bpf/test_run.c:390
bpf_prog_test_run_xdp+0x75b/0x10e0 net/bpf/test_run.c:1331
bpf_prog_test_run+0x2c7/0x340 kernel/bpf/syscall.c:4673
__sys_bpf+0x562/0x860 kernel/bpf/syscall.c:6152
__do_sys_bpf kernel/bpf/syscall.c:6244 [inline]
__se_sys_bpf kernel/bpf/syscall.c:6242 [inline]
__x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:6242
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: 0033:0x7f81f638eec9
RSP: 002b:00007f81f720e038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f81f65e5fa0 RCX: 00007f81f638eec9
RDX: 0000000000000048 RSI: 0000200000000600 RDI: 000000000000000a
RBP: 00007f81f6411f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f81f65e6038 R14: 00007f81f65e5fa0 R15: 00007ffc73984bb8
rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g76113 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: Possible timer handling issue on cpu=0 timer-softirq=40906
rcu: rcu_preempt kthread starved for 10502 jiffies! g76113 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:26792 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5357 [inline]
__schedule+0x1798/0x4cc0 kernel/sched/core.c:6961
__schedule_loop kernel/sched/core.c:7043 [inline]
schedule+0x165/0x360 kernel/sched/core.c:7058
schedule_timeout+0x12b/0x270 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x301/0x1540 kernel/rcu/tree.c:2083
rcu_gp_kthread+0x99/0x390 kernel/rcu/tree.c:2285
kthread+0x70e/0x8a0 kernel/kthread.c:463
ret_from_fork+0x436/0x7d0 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:
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 18153 Comm: syz.4.3300 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:__lock_acquire+0x6c9/0xd20 kernel/locking/lockdep.c:5207
Code: 08 00 00 00 e8 88 25 00 00 45 31 ff 85 c0 0f 84 f5 05 00 00 83 3d f6 c4 0e 18 00 75 13 48 63 44 24 20 48 0f a3 05 67 35 0b 12 <0f> 83 15 05 00 00 31 ed 48 8b 3c 24 4c 8b bf e0 0a 00 00 48 83 7c
RSP: 0000:ffffc90000007750 EFLAGS: 00000047
RAX: 000000000000006d RBX: 0000000000000000 RCX: ffffffff934a0838
RDX: 0000000000000008 RSI: ffff888020b86518 RDI: ffff888020b85a00
RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff81adabcb
R10: dffffc0000000000 R11: ffffed10170c4f51 R12: ffffffffffffff02
R13: 0000000000000002 R14: ffff888020b86518 R15: 0000000000000000
FS: 00007fec8ed556c0(0000) GS:ffff888125c11000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fec8ed54f98 CR3: 0000000054110000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000082 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5868
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0xa7/0xf0 kernel/locking/spinlock.c:162
lock_hrtimer_base kernel/time/hrtimer.c:171 [inline]
hrtimer_try_to_cancel+0x22b/0x420 kernel/time/hrtimer.c:1362
hrtimer_cancel+0x3b/0x50 kernel/time/hrtimer.c:1488
perf_swevent_cancel_hrtimer kernel/events/core.c:11817 [inline]
cpu_clock_event_stop+0xd9/0x130 kernel/events/core.c:11867
__perf_event_overflow+0x580/0xe40 kernel/events/core.c:10333
perf_swevent_hrtimer+0x3c5/0x550 kernel/events/core.c:11773
__run_hrtimer kernel/time/hrtimer.c:1761 [inline]
__hrtimer_run_queues+0x4dd/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:_static_cpu_has arch/x86/include/asm/cpufeature.h:101 [inline]
RIP: 0010:read_pkru arch/x86/include/asm/pkru.h:37 [inline]
RIP: 0010:__pkru_allows_pkey arch/x86/include/asm/pgtable.h:1605 [inline]
RIP: 0010:arch_vma_access_permitted arch/x86/include/asm/mmu_context.h:278 [inline]
RIP: 0010:access_error arch/x86/mm/fault.c:1081 [inline]
RIP: 0010:do_user_addr_fault+0x1351/0x1390 arch/x86/mm/fault.c:1331
Code: 80 e1 07 fe c1 38 c1 0f 8c 59 fe ff ff 48 8b 7c 24 10 e8 a2 01 b0 00 e9 4a fe ff ff f3 0f 1e fa e8 e4 dc 4b 00 e9 aa f8 ff ff 0f 1e fa e8 d6 dc 4b 00 31 db e9 a1 f8 ff ff f3 0f 1e fa e8 c6
RSP: 0000:ffffc9000401fe68 EFLAGS: 00000246
RAX: 1ffff1100d3b0854 RBX: ffff888069d842a0 RCX: dffffc0000000000
RDX: 0000000000000002 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffff888069d84280 R08: 0000000000000000 R09: ffffffff82096d0f
R10: 0000000000000000 R11: fffff52000803f98 R12: 0000000048100073
R13: 00007fec8ed54f98 R14: 0000000000000007 R15: 0000000000000255
handle_page_fault arch/x86/mm/fault.c:1476 [inline]
exc_page_fault+0x76/0xf0 arch/x86/mm/fault.c:1532
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0033:0x7fec8de4e24e
Code: f6 31 c0 e8 14 f4 13 00 48 81 c4 90 00 00 00 48 98 5b c3 66 0f 1f 84 00 00 00 00 00 41 54 55 53 48 89 fb 48 81 ec d0 00 00 00 <48> 89 74 24 28 48 89 54 24 30 48 89 4c 24 38 4c 89 44 24 40 4c 89
RSP: 002b:00007fec8ed54f70 EFLAGS: 00010202
RAX: 0000000000000000 RBX: 00007fec8e0132f6 RCX: 00007fec8e02a3ae
RDX: 000000000000bd2c RSI: 0000000000000000 RDI: 00007fec8e0132f6
RBP: 00007fec8e02a3ae R08: 000000000000008c R09: 7fffffffffffffff
R10: 3fffffffffffffff R11: 0000000000000206 R12: 0000000000000000
R13: 00007fec8e1e6038 R14: 00007fec8e1e5fa0 R15: 00007ffdbeee92b8