rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 1-...!: (1 GPs behind) idle=9594/1/0x4000000000000000 softirq=35732/35733 fqs=3
rcu: (detected by 0, t=10505 jiffies, g=31173, q=376 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 9876 Comm: modprobe Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:arch_atomic64_read arch/x86/include/asm/atomic64_64.h:15 [inline]
RIP: 0010:raw_atomic64_read include/linux/atomic/atomic-arch-fallback.h:2583 [inline]
RIP: 0010:atomic64_read include/linux/atomic/atomic-instrumented.h:1611 [inline]
RIP: 0010:taprio_set_budgets+0x1f6/0x3b0 net/sched/sch_taprio.c:675
Code: 00 e8 03 00 00 4c 8b 74 24 18 4c 89 f7 be 08 00 00 00 e8 3d 32 81 f8 48 b8 00 00 00 00 00 fc ff df 48 8b 4c 24 10 80 3c 01 00 <74> 08 4c 89 f7 e8 b0 2f 81 f8 49 8b 0e 4c 89 e8 48 09 c8 48 c1 e8
RSP: 0018:ffffc90000a08c00 EFLAGS: 00000046
RAX: dffffc0000000000 RBX: 0000000000000004 RCX: 1ffff11006245e5c
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff88803122f2e0
RBP: 0000000000000000 R08: ffff88803122f2e7 R09: 1ffff11006245e5c
R10: dffffc0000000000 R11: ffffed1006245e5d R12: 0000000000000001
R13: 0000000000000000 R14: ffff88803122f2e0 R15: ffff8880569f9000
FS: 0000000000000000(0000) GS:ffff888125ae7000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f86c16a7fe8 CR3: 0000000031240000 CR4: 00000000003526f0
Call Trace:
advance_sched+0x963/0xc90 net/sched/sch_taprio.c:982
__run_hrtimer kernel/time/hrtimer.c:1777 [inline]
__hrtimer_run_queues+0x52c/0xc60 kernel/time/hrtimer.c:1841
hrtimer_interrupt+0x45b/0xaa0 kernel/time/hrtimer.c:1903
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1041 [inline]
__sysvec_apic_timer_interrupt+0x10b/0x410 arch/x86/kernel/apic/apic.c:1058
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1052 [inline]
sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1052
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:check_kcov_mode kernel/kcov.c:194 [inline]
RIP: 0010:write_comp_data kernel/kcov.c:246 [inline]
RIP: 0010:__sanitizer_cov_trace_switch+0xba/0x130 kernel/kcov.c:351
Code: 44 8b 1d f9 b0 03 11 41 81 e3 00 01 ff 00 74 13 41 81 fb 00 01 00 00 75 d9 41 83 b8 7c 16 00 00 00 74 cf 45 8b 98 58 16 00 00 <41> 83 fb 03 75 c2 4d 8b 98 60 16 00 00 45 8b b8 5c 16 00 00 49 c1
RSP: 0018:ffffc9001caff058 EFLAGS: 00000246
RAX: 0000000000000004 RBX: ffffffff8cd99201 RCX: 0000000000000005
RDX: ffffffff8b7d9df0 RSI: ffffffff8faa6460 RDI: 0000000000000001
RBP: ffffc9001caff270 R08: ffff8880298fbc80 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff888032b7f400
R13: 0000000000000000 R14: 00007f86c194cfff R15: 0000000000000001
ma_slots lib/maple_tree.c:706 [inline]
mas_get_slot lib/maple_tree.c:6630 [inline]
mas_validate_gaps lib/maple_tree.c:6898 [inline]
mt_validate+0x23e0/0x4390 lib/maple_tree.c:7174
validate_mm+0xae/0x4a0 mm/vma.c:651
__split_vma+0x8bd/0xa00 mm/vma.c:569
vms_gather_munmap_vmas+0x2e2/0x12e0 mm/vma.c:1359
__mmap_setup mm/vma.c:2375 [inline]
__mmap_region mm/vma.c:2669 [inline]
mmap_region+0x724/0x1c70 mm/vma.c:2764
do_mmap+0xc45/0x10d0 mm/mmap.c:558
vm_mmap_pgoff+0x2a6/0x4d0 mm/util.c:580
ksys_mmap_pgoff+0x51f/0x760 mm/mmap.c:604
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f86c1979242
Code: 08 00 04 00 00 eb e2 90 41 f7 c1 ff 0f 00 00 75 27 55 89 cd 53 48 89 fb 48 85 ff 74 33 41 89 ea 48 89 df b8 09 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 5e 5b 5d c3 0f 1f 00 c7 05 46 40 01 00 16 00
RSP: 002b:00007ffd335b4fa8 EFLAGS: 00000206 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007f86c1695000 RCX: 00007f86c1979242
RDX: 0000000000000005 RSI: 0000000000002000 RDI: 00007f86c1695000
RBP: 0000000000000812 R08: 0000000000000000 R09: 0000000000002000
R10: 0000000000000812 R11: 0000000000000206 R12: 00007ffd335b4ff8
R13: 00007f86c194e050 R14: 00007ffd335b53e0 R15: 00000fffa66b69f8
rcu: rcu_preempt kthread starved for 10490 jiffies! g31173 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->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:R running task stack:27224 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5360 [inline]
__schedule+0x1798/0x4cc0 kernel/sched/core.c:6964
__schedule_loop kernel/sched/core.c:7046 [inline]
schedule+0x165/0x360 kernel/sched/core.c:7061
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+0x711/0x8a0 kernel/kthread.c:463
ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
rcu: Stack dump where RCU GP kthread last ran:
CPU: 0 UID: 0 PID: 9871 Comm: syz.4.963 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:csd_lock_wait kernel/smp.c:342 [inline]
RIP: 0010:smp_call_function_many_cond+0xd38/0x12d0 kernel/smp.c:877
Code: 89 ee 83 e6 01 31 ff e8 36 79 0b 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 e1 74 0b 00 eb 38 f3 90 42 0f b6 04 2b <84> c0 75 11 41 f7 04 24 01 00 00 00 74 1e e8 c5 74 0b 00 eb e4 44
RSP: 0018:ffffc9001caefa20 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 1ffff110170e7ffd RCX: 0000000000080000
RDX: ffffc9000cc8a000 RSI: 000000000007ffff RDI: 0000000000080000
RBP: ffffc9001caefba0 R08: ffffffff8fc39677 R09: 1ffffffff1f872ce
R10: dffffc0000000000 R11: fffffbfff1f872cf R12: ffff8880b873ffe8
R13: dffffc0000000000 R14: ffff8880b863b200 R15: 0000000000000001
FS: 00007f4e68f366c0(0000) GS:ffff8881259e7000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000001840 CR3: 000000007db60000 CR4: 00000000003526f0
Call Trace:
on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1043
on_each_cpu include/linux/smp.h:71 [inline]
smp_text_poke_sync_each_cpu arch/x86/kernel/alternative.c:2713 [inline]
smp_text_poke_batch_finish+0x5f9/0x1130 arch/x86/kernel/alternative.c:2923
arch_jump_label_transform_apply+0x1c/0x30 arch/x86/kernel/jump_label.c:146
static_key_slow_inc_cpuslocked+0x86/0x120 kernel/jump_label.c:168
static_key_slow_inc+0x1a/0x30 kernel/jump_label.c:191
io_uring_create+0x205/0xba0 io_uring/io_uring.c:3809
io_uring_setup io_uring/io_uring.c:3936 [inline]
__do_sys_io_uring_setup io_uring/io_uring.c:3970 [inline]
__se_sys_io_uring_setup+0x264/0x270 io_uring/io_uring.c:3961
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f4e6818ec29
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f4e68f36038 EFLAGS: 00000246 ORIG_RAX: 00000000000001a9
RAX: ffffffffffffffda RBX: 00007f4e683d5fa0 RCX: 00007f4e6818ec29
RDX: 0000000000000000 RSI: 0000200000000440 RDI: 00000000000078bc
RBP: 00007f4e68211e41 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f4e683d6038 R14: 00007f4e683d5fa0 R15: 00007ffd832be668