rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P4506/1:b..l P5648/1:b..l
rcu: (detected by 0, t=10503 jiffies, g=10065, q=898 ncpus=2)
task:dhcpcd-run-hook state:R running task stack:26504 pid:5648 tgid:5648 ppid:5645 flags:0x00004002
Call Trace:
context_switch kernel/sched/core.c:5376 [inline]
__schedule+0x19aa/0x4aa0 kernel/sched/core.c:6688
preempt_schedule_common+0x83/0xc0 kernel/sched/core.c:6865
preempt_schedule+0xd9/0xe0 kernel/sched/core.c:6889
preempt_schedule_thunk+0x16/0x30 arch/x86/entry/thunk_64.S:45
__raw_spin_unlock include/linux/spinlock_api_smp.h:143 [inline]
_raw_spin_unlock+0x36/0x40 kernel/locking/spinlock.c:186
spin_unlock include/linux/spinlock.h:391 [inline]
zap_pte_range mm/memory.c:1534 [inline]
zap_pmd_range mm/memory.c:1582 [inline]
zap_pud_range mm/memory.c:1611 [inline]
zap_p4d_range mm/memory.c:1632 [inline]
unmap_page_range+0x2602/0x32f0 mm/memory.c:1653
unmap_vmas+0x3c8/0x5c0 mm/memory.c:1743
exit_mmap+0x293/0xc20 mm/mmap.c:3308
__mmput+0x115/0x3c0 kernel/fork.c:1349
exit_mm+0x21b/0x2f0 kernel/exit.c:567
do_exit+0x9b3/0x2740 kernel/exit.c:858
do_group_exit+0x202/0x2b0 kernel/exit.c:1021
__do_sys_exit_group kernel/exit.c:1032 [inline]
__se_sys_exit_group kernel/exit.c:1030 [inline]
__x64_sys_exit_group+0x3b/0x40 kernel/exit.c:1030
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x40/0x110 arch/x86/entry/common.c:82
entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7fc81566ba90
RSP: 002b:00007ffd86e1a438 EFLAGS: 00000202 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 000055b45f2c1e04 RCX: 00007fc81566ba90
RDX: 00000000000000e7 RSI: 000000000000003c RDI: 0000000000000000
RBP: 0000000000000003 R08: 00007ffd86e1a530 R09: 0000000000000002
R10: 0000000000000000 R11: 0000000000000202 R12: 00007ffd86e1a758
R13: 00007ffd86e1a770 R14: 000055b45e042169 R15: 00007fc815862a80
task:udevd state:R running task stack:23208 pid:4506 tgid:4506 ppid:1 flags:0x00004002
Call Trace:
context_switch kernel/sched/core.c:5376 [inline]
__schedule+0x19aa/0x4aa0 kernel/sched/core.c:6688
preempt_schedule_common+0x83/0xc0 kernel/sched/core.c:6865
preempt_schedule+0xd9/0xe0 kernel/sched/core.c:6889
preempt_schedule_thunk+0x16/0x30 arch/x86/entry/thunk_64.S:45
__raw_spin_unlock include/linux/spinlock_api_smp.h:143 [inline]
_raw_spin_unlock+0x36/0x40 kernel/locking/spinlock.c:186
dput+0x346/0x470 fs/dcache.c:900
step_into+0x351/0x1070 fs/namei.c:1855
walk_component fs/namei.c:2008 [inline]
link_path_walk+0x731/0xe70 fs/namei.c:2329
path_lookupat+0xa9/0x450 fs/namei.c:2482
filename_lookup+0x251/0x600 fs/namei.c:2512
user_path_at_empty+0x3e/0x60 fs/namei.c:2911
do_readlinkat+0x114/0x3a0 fs/stat.c:494
__do_sys_readlink fs/stat.c:527 [inline]
__se_sys_readlink fs/stat.c:524 [inline]
__x64_sys_readlink+0x7b/0x90 fs/stat.c:524
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x40/0x110 arch/x86/entry/common.c:82
entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7f3c6b95cd47
RSP: 002b:00007ffcc708a258 EFLAGS: 00000246 ORIG_RAX: 0000000000000059
RAX: ffffffffffffffda RBX: 00007ffcc708a268 RCX: 00007f3c6b95cd47
RDX: 0000000000000400 RSI: 00007ffcc708a268 RDI: 00007ffcc708a748
RBP: 0000000000000400 R08: 00005611f0412a74 R09: 0000000000000000
R10: 0000000000000812 R11: 0000000000000246 R12: 00007ffcc708a748
R13: 00007ffcc708a6b8 R14: 00005611f0401910 R15: 0000000000000000
rcu: rcu_preempt kthread starved for 10560 jiffies! g10065 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:26440 pid:17 tgid:17 ppid:2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5376 [inline]
__schedule+0x19aa/0x4aa0 kernel/sched/core.c:6688
__schedule_loop kernel/sched/core.c:6763 [inline]
schedule+0x145/0x250 kernel/sched/core.c:6778
schedule_timeout+0x1b9/0x300 kernel/time/timer.c:2167
rcu_gp_fqs_loop+0x306/0x14f0 kernel/rcu/tree.c:1631
rcu_gp_kthread+0xa3/0x3a0 kernel/rcu/tree.c:1830
kthread+0x2cf/0x360 kernel/kthread.c:388
ret_from_fork+0x44/0x70 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242
rcu: Stack dump where RCU GP kthread last ran:
CPU: 0 PID: 5654 Comm: syz-executor.1 Not tainted 6.7.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023
RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:160 [inline]
RIP: 0010:_raw_spin_unlock_irq+0x25/0x40 kernel/locking/spinlock.c:202
Code: b1 81 f5 ff 90 53 48 89 fb 48 83 c7 18 48 8b 74 24 08 e8 be 53 92 f6 48 89 df e8 76 42 93 f6 e8 41 da b9 f6 fb bf 01 00 00 00 b6 6a 85 f6 65 8b 05 37 d2 28 75 85 c0 74 02 5b c3 e8 34 a5 25
RSP: 0018:ffffc9000a027c50 EFLAGS: 00000282
RAX: 4c0f488a2b073a00 RBX: ffff888026fbae40 RCX: ffffffff91f0b303
RDX: dffffc0000000000 RSI: ffffffff8b0c1ea0 RDI: 0000000000000001
RBP: ffffc9000a027d90 R08: ffffffff8e9b8bef R09: 1ffffffff1d3717d
R10: dffffc0000000000 R11: fffffbfff1d3717e R12: 1ffff11004df765b
R13: 000000001c000004 R14: 0000000000000021 R15: ffff888026fbb2d8
FS: 00007f9ece4ac6c0(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9ece4abf00 CR3: 000000001ec5f000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
spin_unlock_irq include/linux/spinlock.h:401 [inline]
get_signal+0x1565/0x1840 kernel/signal.c:2907
arch_do_signal_or_restart+0x92/0x800 arch/x86/kernel/signal.c:309
exit_to_user_mode_loop+0x6a/0x100 kernel/entry/common.c:168
exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:204
__syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline]
syscall_exit_to_user_mode+0x60/0x270 kernel/entry/common.c:296
do_syscall_64+0x4c/0x110 arch/x86/entry/common.c:88
entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7f9ecd67cae9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f9ece4ac0c8 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 00007f9ecd79bf80 RCX: 00007f9ecd67cae9
RDX: 0000000020000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007f9ecd6c847a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f9ecd79bf80 R15: 00007fffbb0e3488
sched: RT throttling activated