rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P5647/1:b..l P8379/1:b..l
rcu: (detected by 1, t=10506 jiffies, g=23009, q=1096 ncpus=2)
task:syz-executor state:R running task stack:24472 pid:8379 tgid:8379 ppid:5622 task_flags:0x400000 flags:0x00080001
Call Trace:
context_switch kernel/sched/core.c:5388 [inline]
__schedule+0x1821/0x5740 kernel/sched/core.c:7189
preempt_schedule_common+0x82/0xd0 kernel/sched/core.c:7370
preempt_schedule_thunk+0x16/0x30 arch/x86/entry/thunk.S:12
__raw_spin_unlock include/linux/spinlock_api_smp.h:169 [inline]
_raw_spin_unlock+0x3f/0x50 kernel/locking/spinlock.c:190
spin_unlock include/linux/spinlock.h:390 [inline]
change_pte_range mm/mprotect.c:413 [inline]
change_pmd_range mm/mprotect.c:537 [inline]
change_pud_range mm/mprotect.c:600 [inline]
change_p4d_range mm/mprotect.c:626 [inline]
change_protection_range mm/mprotect.c:654 [inline]
change_protection+0x4263/0x4c80 mm/mprotect.c:688
mprotect_fixup+0x83e/0xb60 mm/mprotect.c:807
do_mprotect_pkey+0x8d5/0xd20 mm/mprotect.c:967
__do_sys_mprotect mm/mprotect.c:988 [inline]
__se_sys_mprotect mm/mprotect.c:985 [inline]
__x64_sys_mprotect+0x80/0x90 mm/mprotect.c:985
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe267f9cc57
RSP: 002b:00007ffd270b9eb8 EFLAGS: 00000206 ORIG_RAX: 000000000000000a
RAX: ffffffffffffffda RBX: 00007fe2681ee8a0 RCX: 00007fe267f9cc57
RDX: 0000000000000001 RSI: 000000000012e000 RDI: 00007fe2680b9000
RBP: 00007ffd270b9f58 R08: 0000555576071840 R09: 0000555576071860
R10: 0000000000000005 R11: 0000000000000206 R12: 00007ffd270b9f70
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
task:syz-executor state:R running task stack:22544 pid:5647 tgid:5647 ppid:5632 task_flags:0x400140 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5388 [inline]
__schedule+0x1821/0x5740 kernel/sched/core.c:7189
preempt_schedule_common+0x82/0xd0 kernel/sched/core.c:7370
preempt_schedule_thunk+0x16/0x30 arch/x86/entry/thunk.S:12
__raw_spin_unlock include/linux/spinlock_api_smp.h:169 [inline]
_raw_spin_unlock+0x3f/0x50 kernel/locking/spinlock.c:190
spin_unlock include/linux/spinlock.h:390 [inline]
wp_page_copy mm/memory.c:3976 [inline]
do_wp_page+0x3f15/0x4cc0 mm/memory.c:4336
handle_pte_fault mm/memory.c:6443 [inline]
__handle_mm_fault mm/memory.c:6565 [inline]
handle_mm_fault+0x1698/0x3170 mm/memory.c:6734
do_user_addr_fault+0xa73/0x1340 arch/x86/mm/fault.c:1334
handle_page_fault arch/x86/mm/fault.c:1474 [inline]
exc_page_fault+0x6a/0xc0 arch/x86/mm/fault.c:1527
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618
RIP: 0033:0x7f399cf5ce4a
RSP: 002b:00007ffcaf140b30 EFLAGS: 00010246
RAX: 0000000000000008 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000001 RSI: 0000000000000000 RDI: 00007f399dd48060
RBP: 00000000000001cd R08: 00007f399dd48060 R09: 0000000000000000
R10: 0000555580ec57d0 R11: 0000000000000246 R12: 0000000000000001
R13: 0000000000000062 R14: 0000000000033ea0 R15: 00007ffcaf140d40
rcu: rcu_preempt kthread timer wakeup didn't happen for 10505 jiffies! g23009 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: Possible timer handling issue on cpu=0 timer-softirq=5102
rcu: rcu_preempt kthread starved for 10506 jiffies! g23009 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:27544 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5388 [inline]
__schedule+0x1821/0x5740 kernel/sched/core.c:7189
__schedule_loop kernel/sched/core.c:7268 [inline]
schedule+0x164/0x360 kernel/sched/core.c:7283
schedule_timeout+0x158/0x2c0 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x312/0x11d0 kernel/rcu/tree.c:2095
rcu_gp_kthread+0x9e/0x2b0 kernel/rcu/tree.c:2297
kthread+0x389/0x470 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 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:
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 5000 Comm: udevd Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
RIP: 0010:__lock_release kernel/locking/lockdep.c:5571 [inline]
RIP: 0010:lock_release+0x179/0x3c0 kernel/locking/lockdep.c:5889
Code: 01 c8 05 00 00 e0 ff 81 c1 00 00 e0 ff 89 45 20 85 c9 0f 85 e6 00 00 00 45 89 af 88 0b 00 00 48 8b 45 00 49 89 87 80 0b 00 00 <41> 39 d5 0f 84 cb 00 00 00 41 ff c5 48 8d 4c 24 24 4c 89 ff 48 8b
RSP: 0018:ffffc90000007ca8 EFLAGS: 00000083
RAX: 612330b16eac30d4 RBX: 0000000000000002 RCX: 0000000080010000
RDX: 0000000000000002 RSI: ffffffff8e95cce0 RDI: ffff888032ca0be0
RBP: ffff888032ca0be0 R08: ffff88802bc5519f R09: 1ffff1100578aa33
R10: dffffc0000000000 R11: ffffed100578aa34 R12: 0000000000000002
R13: 0000000000000002 R14: ffffffff8e95cce0 R15: ffff888032ca0000
FS: 00007f7498f8b880(0000) GS:ffff88812529e000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055b77246eed0 CR3: 00000000236ce000 CR4: 00000000003526f0
Call Trace:
rcu_lock_release include/linux/rcupdate.h:310 [inline]
rcu_read_unlock include/linux/rcupdate.h:869 [inline]
advance_sched+0xac6/0xc20 net/sched/sch_taprio.c:994
__run_hrtimer kernel/time/hrtimer.c:1930 [inline]
__hrtimer_run_queues+0x3c0/0xa20 kernel/time/hrtimer.c:1994
hrtimer_interrupt+0x44b/0x950 kernel/time/hrtimer.c:2113
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
__sysvec_apic_timer_interrupt+0x102/0x430 arch/x86/kernel/apic/apic.c:1067
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1061 [inline]
sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1061
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:lock_is_held_type+0x106/0x150 kernel/locking/lockdep.c:5945
Code: 1a 00 00 b8 ff ff ff ff 65 0f c1 05 f4 0c 91 07 83 f8 01 75 25 9c 58 a9 00 02 00 00 75 39 41 f7 c4 00 02 00 00 74 01 fb 89 d8 <5b> 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc 90 0f 0b 90 48 c7
RSP: 0018:ffffc90005bcf840 EFLAGS: 00000206
RAX: 0000000000000001 RBX: 0000000000000001 RCX: 0000000000000046
RDX: ffff888032ca0000 RSI: ffffffff8e216082 RDI: ffffffff8c28b760
RBP: 00000000ffffffff R08: ffffffff826ff12c R09: ffffffff8e95cce0
R10: dffffc0000000000 R11: ffffed1004d782f1 R12: 0000000000000246
R13: ffff888032ca0000 R14: ffffffff8e95cce0 R15: 0000000000000001
kernfs_root+0xf6/0x230 fs/kernfs/kernfs-internal.h:75
kernfs_root_is_locked fs/kernfs/kernfs-internal.h:108 [inline]
kernfs_parent+0x51/0x190 fs/kernfs/kernfs-internal.h:132
kernfs_dop_revalidate+0x26d/0x650 fs/kernfs/dir.c:1224
d_revalidate fs/namei.c:1030 [inline]
lookup_fast+0x253/0x5b0 fs/namei.c:-1
walk_component fs/namei.c:2274 [inline]
lookup_last fs/namei.c:2785 [inline]
path_lookupat+0x209/0x8c0 fs/namei.c:2809
filename_lookup+0x256/0x5d0 fs/namei.c:2838
vfs_statx+0xfc/0x200 fs/stat.c:353
vfs_fstatat+0x11b/0x170 fs/stat.c:373
__do_sys_newfstatat fs/stat.c:538 [inline]
__se_sys_newfstatat fs/stat.c:532 [inline]
__x64_sys_newfstatat+0x151/0x200 fs/stat.c:532
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f7498911b0a
Code: 48 8b 15 f1 f2 0d 00 f7 d8 64 89 02 b8 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 41 89 ca b8 06 01 00 00 0f 05 <3d> 00 f0 ff ff 77 07 31 c0 c3 0f 1f 40 00 48 8b 15 b9 f2 0d 00 f7
RSP: 002b:00007fff4c1df998 EFLAGS: 00000246 ORIG_RAX: 0000000000000106
RAX: ffffffffffffffda RBX: 00007fff4c1dfe30 RCX: 00007f7498911b0a
RDX: 00007fff4c1df9a0 RSI: 00007fff4c1dfe30 RDI: 00000000ffffff9c
RBP: 000055b772445910 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fff4c1dfa30
R13: 000055b73fbee100 R14: 000055b7724465c0 R15: 00007fff4c1e0450
ip6_tunnel: ip6gre1 xmit: Local address not yet configured!