rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P12050/3:b..l
rcu: (detected by 1, t=10502 jiffies, g=44885, q=412 ncpus=2)
task:syz.0.1640 state:R running task stack:23384 pid:12050 tgid:12050 ppid:5841 task_flags:0x400640 flags:0x00004006
Call Trace:
context_switch kernel/sched/core.c:5357 [inline]
__schedule+0x1190/0x5de0 kernel/sched/core.c:6961
preempt_schedule_common+0x44/0xc0 kernel/sched/core.c:7145
preempt_schedule_thunk+0x16/0x30 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]
filemap_map_pages+0xe15/0x1670 mm/filemap.c:3791
do_fault_around mm/memory.c:5531 [inline]
do_read_fault mm/memory.c:5564 [inline]
do_fault mm/memory.c:5707 [inline]
do_pte_missing+0xe39/0x3ba0 mm/memory.c:4234
handle_pte_fault mm/memory.c:6052 [inline]
__handle_mm_fault+0x152a/0x2a50 mm/memory.c:6195
handle_mm_fault+0x589/0xd10 mm/memory.c:6364
faultin_page mm/gup.c:1144 [inline]
__get_user_pages+0x551/0x34a0 mm/gup.c:1446
__get_user_pages_locked mm/gup.c:1712 [inline]
get_dump_page+0x257/0x3d0 mm/gup.c:2212
dump_user_range+0x195/0xb70 fs/coredump.c:1364
elf_core_dump+0x2929/0x3b60 fs/binfmt_elf.c:2085
coredump_write fs/coredump.c:1049 [inline]
vfs_coredump+0x2ba2/0x56d0 fs/coredump.c:1168
get_signal+0x22e3/0x26d0 kernel/signal.c:3019
arch_do_signal_or_restart+0x8f/0x7d0 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+0x12a/0x270 kernel/entry/common.c:73
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0033:0x7f16aed8ebf1
RSP: 002b:fffffffffffffc70 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007f16aefb5fa0 RCX: 00007f16aed8ebe9
RDX: 0000000000000000 RSI: fffffffffffffc70 RDI: 0000000001022000
RBP: 00007f16aee11e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 00007f16aefb6038 R14: 00007f16aefb5fa0 R15: 00007ffc6053c488
rcu: rcu_preempt kthread starved for 10493 jiffies! g44885 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:28208 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5357 [inline]
__schedule+0x1190/0x5de0 kernel/sched/core.c:6961
preempt_schedule_common+0x44/0xc0 kernel/sched/core.c:7145
preempt_schedule_thunk+0x16/0x30 arch/x86/entry/thunk.S:12
__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
_raw_spin_unlock_irqrestore+0x61/0x80 kernel/locking/spinlock.c:194
__debug_object_init+0x2de/0x3d0 lib/debugobjects.c:755
timer_init_key_on_stack+0x2e/0x120 kernel/time/timer.c:816
schedule_timeout+0x111/0x290 kernel/time/sleep_timeout.c:96
rcu_gp_fqs_loop+0x1ea/0xb00 kernel/rcu/tree.c:2083
rcu_gp_kthread+0x270/0x380 kernel/rcu/tree.c:2285
kthread+0x3c5/0x780 kernel/kthread.c:463
ret_from_fork+0x5d7/0x6f0 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: 12086 Comm: syz.7.1648 Not tainted 6.17.0-rc1-syzkaller-00016-g8742b2d8935f #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:advance_sched+0x42/0xc80 net/sched/sch_taprio.c:921
Code: 14 f8 48 8d 7b 88 48 8d 43 80 48 89 fa 48 89 44 24 48 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 98 0b 00 00 <48> 8b 43 88 48 8d 78 40 48 89 44 24 28 48 b8 00 00 00 00 00 fc ff
RSP: 0018:ffffc90000007d90 EFLAGS: 00000046
RAX: dffffc0000000000 RBX: ffff8880529f5340 RCX: 1ffff110057ce15b
RDX: 1ffff1100a53ea59 RSI: ffffffff89a74e9a RDI: ffff8880529f52c8
RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880b8427c80
R13: 0000000000000000 R14: ffff8880529f5340 R15: ffffffff89a74e80
FS: 00007fb4758a26c0(0000) GS:ffff8881246bc000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b32808ff8 CR3: 000000007c189000 CR4: 00000000003526f0
DR0: 000000000000004b DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
__run_hrtimer kernel/time/hrtimer.c:1761 [inline]
__hrtimer_run_queues+0x202/0xad0 kernel/time/hrtimer.c:1825
hrtimer_interrupt+0x397/0x8e0 kernel/time/hrtimer.c:1887
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1039 [inline]
__sysvec_apic_timer_interrupt+0x10b/0x3f0 arch/x86/kernel/apic/apic.c:1056
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
sysvec_apic_timer_interrupt+0x9f/0xc0 arch/x86/kernel/apic/apic.c:1050
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:preempt_schedule_irq+0x4c/0x90 kernel/sched/core.c:7288
Code: df 55 65 48 8b 2d 5c c9 41 08 53 48 89 eb 48 c1 eb 03 48 01 c3 bf 01 00 00 00 e8 bf 11 f4 f5 e8 fa 02 2f f6 fb bf 01 00 00 00 af 99 ff ff 9c 58 fa f6 c4 02 75 1e bf 01 00 00 00 e8 bd 9c f3
RSP: 0018:ffffc9000b9b7bc8 EFLAGS: 00000202
RAX: 0000000000001243 RBX: ffffed10057ce000 RCX: ffffffff81c378cf
RDX: 0000000000000000 RSI: ffffffff8de4f205 RDI: 0000000000000001
RBP: ffff88802be70000 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff90ab3697 R11: 0000000000000001 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
irqentry_exit+0x36/0x90 kernel/entry/common.c:197
asm_sysvec_call_function_single+0x1a/0x20 arch/x86/include/asm/idtentry.h:709
RIP: 0010:rcu_preempt_read_exit kernel/rcu/tree_plugin.h:398 [inline]
RIP: 0010:__rcu_read_unlock+0x6f/0x620 kernel/rcu/tree_plugin.h:435
Code: 65 4c 8b 25 9b 56 34 12 49 8d bc 24 44 04 00 00 8b 9d 44 04 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 83 eb 01 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 f3
RSP: 0018:ffffc9000b9b7c90 EFLAGS: 00000246
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffc9000b9b7c4c
RDX: 1ffff110057ce088 RSI: ffffffff8de29d10 RDI: ffff88802be70444
RBP: ffff88802be70000 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: ffff88802be70000
R13: 1bc16ce9399919c4 R14: dffffc0000000000 R15: ffff8880b8527c80
clock_was_set+0x678/0x870 kernel/time/hrtimer.c:982
do_settimeofday64+0x35d/0x540 kernel/time/timekeeping.c:1454
do_sys_settimeofday64+0x1dc/0x260 kernel/time/time.c:195
__do_sys_clock_settime kernel/time/posix-timers.c:1132 [inline]
__se_sys_clock_settime kernel/time/posix-timers.c:1116 [inline]
__x64_sys_clock_settime+0x1be/0x2a0 kernel/time/posix-timers.c:1116
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb47498ebe9
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:00007fb4758a2038 EFLAGS: 00000246 ORIG_RAX: 00000000000000e3
RAX: ffffffffffffffda RBX: 00007fb474bb6090 RCX: 00007fb47498ebe9
RDX: 0000000000000000 RSI: 0000200000000240 RDI: 0000000000000000
RBP: 00007fb474a11e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fb474bb6128 R14: 00007fb474bb6090 R15: 00007fff463ff558