rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 1-...!: (1 GPs behind) idle=86b4/1/0x4000000000000000 softirq=62985/62986 fqs=0
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P16942/1:b..l
rcu: (detected by 0, t=10502 jiffies, g=59241, q=120 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 16949 Comm: syz.0.2668 Not tainted 6.14.0-rc6-syzkaller-00007-g0b46b049d6ec #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:native_save_fl arch/x86/include/asm/irqflags.h:26 [inline]
RIP: 0010:arch_local_save_flags arch/x86/include/asm/irqflags.h:87 [inline]
RIP: 0010:arch_local_irq_save arch/x86/include/asm/irqflags.h:123 [inline]
RIP: 0010:lock_acquire.part.0+0xd2/0x380 kernel/locking/lockdep.c:5847
Code: f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 80 02 00 00 8b 95 ec 0a 00 00 85 d2 0f 85 d5 00 00 00 44 89 44 24 04 89 0c 24 9c <5d> fa 48 c7 c7 40 ff 6c 8b e8 b0 db c0 09 44 89 e2 44 89 f6 4c 89
RSP: 0000:ffffc90000a28c38 EFLAGS: 00000046
RAX: 0000000000000007 RBX: 1ffff92000145189 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff88805f0faf2c
RBP: ffff88805f0fa440 R08: 0000000000000001 R09: 0000000000000000
R10: ffffffff90626317 R11: 0000000000000001 R12: 0000000000000000
R13: ffffffff9ab1d018 R14: 0000000000000000 R15: 0000000000000000
FS: 00007f4f704576c0(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c2c918a CR3: 00000000237fa000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:162
debug_object_deactivate+0x13b/0x370 lib/debugobjects.c:873
debug_hrtimer_deactivate kernel/time/hrtimer.c:460 [inline]
debug_deactivate kernel/time/hrtimer.c:502 [inline]
__run_hrtimer kernel/time/hrtimer.c:1769 [inline]
__hrtimer_run_queues+0x47c/0xae0 kernel/time/hrtimer.c:1865
hrtimer_interrupt+0x392/0x8e0 kernel/time/hrtimer.c:1927
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1038 [inline]
__sysvec_apic_timer_interrupt+0x10f/0x400 arch/x86/kernel/apic/apic.c:1055
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
sysvec_apic_timer_interrupt+0x9f/0xc0 arch/x86/kernel/apic/apic.c:1049
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:finish_task_switch.isra.0+0x220/0xcc0 kernel/sched/core.c:5252
Code: a9 0a 00 00 44 8b 0d f3 dd d9 0e 45 85 c9 0f 85 c0 01 00 00 48 89 df e8 ae f8 ff ff e8 79 f0 38 00 fb 65 48 8b 1d e0 20 7b 7e <48> 8d bb 08 16 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1
RSP: 0000:ffffc90003ecf4d8 EFLAGS: 00000206
RAX: 000000000000acc9 RBX: ffff88805f0fa440 RCX: 1ffffffff20c43f1
RDX: 0000000000000000 RSI: ffffffff8b6cfc80 RDI: ffffffff8bd36a20
RBP: ffffc90003ecf520 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff90626317 R11: 0000000000000000 R12: dffffc0000000000
R13: ffff88801df80000 R14: 0000000000000000 R15: 0000000000000000
context_switch kernel/sched/core.c:5381 [inline]
__schedule+0xf4b/0x5890 kernel/sched/core.c:6765
__schedule_loop kernel/sched/core.c:6842 [inline]
schedule+0xe7/0x350 kernel/sched/core.c:6857
schedule_timeout+0x244/0x280 kernel/time/sleep_timeout.c:75
unix_wait_for_peer+0x247/0x280 net/unix/af_unix.c:1526
unix_dgram_sendmsg+0x179d/0x1880 net/unix/af_unix.c:2128
sock_sendmsg_nosec net/socket.c:718 [inline]
__sock_sendmsg net/socket.c:733 [inline]
____sys_sendmsg+0xaaf/0xc90 net/socket.c:2573
___sys_sendmsg+0x135/0x1e0 net/socket.c:2627
__sys_sendmmsg+0x201/0x420 net/socket.c:2716
__do_sys_sendmmsg net/socket.c:2743 [inline]
__se_sys_sendmmsg net/socket.c:2740 [inline]
__x64_sys_sendmmsg+0x9c/0x100 net/socket.c:2740
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f4f6f58d169
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:00007f4f70457038 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 00007f4f6f7a5fa0 RCX: 00007f4f6f58d169
RDX: 0000000000000651 RSI: 0000400000000000 RDI: 0000000000000004
RBP: 00007f4f6f60e2a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f4f6f7a5fa0 R15: 00007ffca00f3cb8
task:syz.2.2665 state:R running task stack:26096 pid:16942 tgid:16939 ppid:5828 task_flags:0x40044c flags:0x00004002
Call Trace:
context_switch kernel/sched/core.c:5378 [inline]
__schedule+0xf43/0x5890 kernel/sched/core.c:6765
preempt_schedule_common+0x44/0xc0 kernel/sched/core.c:6944
preempt_schedule_thunk+0x1a/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]
zap_pte_range mm/memory.c:1772 [inline]
zap_pmd_range mm/memory.c:1834 [inline]
zap_pud_range mm/memory.c:1863 [inline]
zap_p4d_range mm/memory.c:1884 [inline]
unmap_page_range+0x201d/0x4350 mm/memory.c:1905
unmap_single_vma+0x194/0x2b0 mm/memory.c:1951
unmap_vmas+0x22f/0x490 mm/memory.c:1995
exit_mmap+0x1c1/0xba0 mm/mmap.c:1284
__mmput+0x12a/0x410 kernel/fork.c:1356
mmput+0x62/0x70 kernel/fork.c:1378
exit_mm kernel/exit.c:570 [inline]
do_exit+0x9ba/0x2d70 kernel/exit.c:925
do_group_exit+0xd3/0x2a0 kernel/exit.c:1087
get_signal+0x24ed/0x26c0 kernel/signal.c:3036
arch_do_signal_or_restart+0x90/0x7e0 arch/x86/kernel/signal.c:337
exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline]
__syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
syscall_exit_to_user_mode+0x150/0x2a0 kernel/entry/common.c:218
do_syscall_64+0xda/0x250 arch/x86/entry/common.c:89
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f2398b8d169
RSP: 002b:00007f2399a58038 EFLAGS: 00000246 ORIG_RAX: 000000000000012b
RAX: 000000000003fffd RBX: 00007f2398da6080 RCX: 00007f2398b8d169
RDX: 03fffffffffffeda RSI: 00004000000000c0 RDI: 0000000000000003
RBP: 00007f2398c0e2a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000002 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000001 R14: 00007f2398da6080 R15: 00007ffd6e9bcda8
rcu: rcu_preempt kthread starved for 10502 jiffies! g59241 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:28048 pid:18 tgid:18 ppid:2 task_flags:0x208040 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5378 [inline]
__schedule+0xf43/0x5890 kernel/sched/core.c:6765
__schedule_loop kernel/sched/core.c:6842 [inline]
schedule+0xe7/0x350 kernel/sched/core.c:6857
schedule_timeout+0x124/0x280 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x1eb/0xb00 kernel/rcu/tree.c:2024
rcu_gp_kthread+0x271/0x380 kernel/rcu/tree.c:2226
kthread+0x3af/0x750 kernel/kthread.c:464
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
rcu: Stack dump where RCU GP kthread last ran:
CPU: 0 UID: 0 PID: 16935 Comm: syz.3.2664 Not tainted 6.14.0-rc6-syzkaller-00007-g0b46b049d6ec #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:csd_lock_wait kernel/smp.c:340 [inline]
RIP: 0010:smp_call_function_many_cond+0x4c6/0x12c0 kernel/smp.c:885
Code: 0c 00 85 ed 74 4d 48 b8 00 00 00 00 00 fc ff df 4d 89 fc 4c 89 fd 49 c1 ec 03 83 e5 07 49 01 c4 83 c5 03 e8 ac 0e 0c 00 f3 90 <41> 0f b6 04 24 40 38 c5 7c 08 84 c0 0f 85 e8 0b 00 00 8b 43 08 31
RSP: 0018:ffffc900030e74c0 EFLAGS: 00000293
RAX: 0000000000000000 RBX: ffff8880b8744a80 RCX: ffffffff81ade25a
RDX: ffff888030f20000 RSI: ffffffff81ade234 RDI: 0000000000000005
RBP: 0000000000000003 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000003 R12: ffffed10170e8951
R13: 0000000000000001 R14: ffff8880b863fe80 R15: ffff8880b8744a88
FS: 0000000000000000(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c3069b4 CR3: 000000003a0a6000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
on_each_cpu_cond_mask+0x40/0x90 kernel/smp.c:1052
__flush_tlb_multi arch/x86/include/asm/paravirt.h:91 [inline]
flush_tlb_multi arch/x86/mm/tlb.c:966 [inline]
flush_tlb_mm_range+0x271/0x4a0 arch/x86/mm/tlb.c:1054
tlb_flush arch/x86/include/asm/tlb.h:20 [inline]
tlb_flush_mmu_tlbonly include/asm-generic/tlb.h:481 [inline]
tlb_flush_mmu_tlbonly include/asm-generic/tlb.h:471 [inline]
zap_pte_range mm/memory.c:1769 [inline]
zap_pmd_range mm/memory.c:1834 [inline]
zap_pud_range mm/memory.c:1863 [inline]
zap_p4d_range mm/memory.c:1884 [inline]
unmap_page_range+0x1f5b/0x4350 mm/memory.c:1905
unmap_single_vma+0x194/0x2b0 mm/memory.c:1951
unmap_vmas+0x22f/0x490 mm/memory.c:1995
exit_mmap+0x1c1/0xba0 mm/mmap.c:1284
__mmput+0x12a/0x410 kernel/fork.c:1356
mmput+0x62/0x70 kernel/fork.c:1378
exit_mm kernel/exit.c:570 [inline]
do_exit+0x9ba/0x2d70 kernel/exit.c:925
do_group_exit+0xd3/0x2a0 kernel/exit.c:1087
get_signal+0x24ed/0x26c0 kernel/signal.c:3036
arch_do_signal_or_restart+0x90/0x7e0 arch/x86/kernel/signal.c:337
exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline]
__syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
syscall_exit_to_user_mode+0x150/0x2a0 kernel/entry/common.c:218
do_syscall_64+0xda/0x250 arch/x86/entry/common.c:89
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6e4fb8d169
Code: Unable to access opcode bytes at 0x7f6e4fb8d13f.
RSP: 002b:00007f6e50aa8038 EFLAGS: 00000246 ORIG_RAX: 000000000000012b
RAX: 0000000000010106 RBX: 00007f6e4fda5fa0 RCX: 00007f6e4fb8d169
RDX: 0000000000010106 RSI: 00004000000000c0 RDI: 0000000000000008
RBP: 00007f6e4fc0e2a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000002 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f6e4fda5fa0 R15: 00007ffc27aa9bf8