rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 1-...!: (0 ticks this GP) idle=d8c4/1/0x4000000000000000 softirq=33984/33985 fqs=0
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P36/1:b..l P6280/1:b..l P5829/1:b..l
rcu: (detected by 0, t=10502 jiffies, g=26485, q=168 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 9391 Comm: syz.1.998 Not tainted 6.16.0-rc7-syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:__timerqueue_less lib/timerqueue.c:22 [inline]
RIP: 0010:rb_add_cached include/linux/rbtree.h:174 [inline]
RIP: 0010:timerqueue_add+0xfc/0x330 lib/timerqueue.c:40
Code: 80 3c 22 00 0f 85 ca 01 00 00 49 8b 17 48 85 d2 74 40 48 89 d3 e8 e4 3d 39 f6 48 8d 7b 18 48 89 f8 48 c1 e8 03 42 80 3c 20 00 <0f> 85 b1 01 00 00 4c 8b 7b 18 4c 89 ef 4c 89 fe e8 6f 38 39 f6 4d
RSP: 0018:ffffc90000a08e00 EFLAGS: 00000046
RAX: 1ffff110292d766b RBX: ffff8881496bb340 RCX: ffffffff8b82a9e8
RDX: ffff888054258000 RSI: ffffffff8b82aa8c RDI: ffff8881496bb358
RBP: ffff8880223c7340 R08: 0000000000000006 R09: ffff8880223c7340
R10: ffff8880223c7340 R11: ffffffff9afa56e0 R12: dffffc0000000000
R13: 18586d6724000000 R14: 0000000000000001 R15: 0000000000000001
FS: 00007f35a33f66c0(0000) GS:ffff888124820000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000020000002a000 CR3: 00000000377f4000 CR4: 00000000003526f0
Call Trace:
__run_hrtimer kernel/time/hrtimer.c:1778 [inline]
__hrtimer_run_queues+0x8ff/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:__schedule_loop kernel/sched/core.c:6866 [inline]
RIP: 0010:schedule+0xff/0x3a0 kernel/sched/core.c:6879
Code: c5 bf 01 00 00 00 e8 d0 c1 01 f6 31 ff e8 39 a1 ff ff bf 01 00 00 00 e8 2f 49 01 f6 80 7d 00 00 0f 85 78 02 00 00 49 8b 45 00 08 75 d3 48 b8 00 00 00 00 00 fc ff df 4c 89 e2 48 c1 ea 03 0f
RSP: 0018:ffffc90004d27910 EFLAGS: 00000246
RAX: 0000000000004002 RBX: ffff888054258000 RCX: 0000000000000000
RDX: 0000000000000001 RSI: fffff520009a4f03 RDI: 0000000000000001
RBP: ffffed100a84b000 R08: 0000000000000000 R09: fffffbfff215280a
R10: ffffffff90a94057 R11: 0000000000000001 R12: ffff88805425802c
R13: ffff888054258000 R14: 7fffffffffffffff R15: ffff888054258000
schedule_timeout+0x257/0x290 kernel/time/sleep_timeout.c:75
do_wait_for_common kernel/sched/completion.c:95 [inline]
__wait_for_common+0x2fc/0x4e0 kernel/sched/completion.c:116
rdmsr_safe_on_cpu+0x1dc/0x210 arch/x86/lib/msr-smp.c:181
msr_read+0x19d/0x250 arch/x86/kernel/msr.c:66
vfs_read+0x1e1/0xc60 fs/read_write.c:570
ksys_read+0x12a/0x250 fs/read_write.c:715
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: 0033:0x7f35a558e9a9
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:00007f35a33f6038 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 00007f35a57b5fa0 RCX: 00007f35a558e9a9
RDX: 0000000000018ff8 RSI: 0000200000019680 RDI: 0000000000000003
RBP: 00007f35a5610d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f35a57b5fa0 R15: 00007ffd5dc05058
task:syz-executor state:R running task stack:22680 pid:5829 tgid:5829 ppid:5823 task_flags:0x400140 flags:0x00004002
Call Trace:
context_switch kernel/sched/core.c:5397 [inline]
__schedule+0x116a/0x5dd0 kernel/sched/core.c:6786
preempt_schedule_common+0x44/0xc0 kernel/sched/core.c:6966
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]
copy_pte_range mm/memory.c:1206 [inline]
copy_pmd_range mm/memory.c:1267 [inline]
copy_pud_range mm/memory.c:1304 [inline]
copy_p4d_range mm/memory.c:1328 [inline]
copy_page_range+0x13c5/0x5740 mm/memory.c:1416
dup_mmap+0xe88/0x21d0 mm/mmap.c:1838
dup_mm kernel/fork.c:1477 [inline]
copy_mm kernel/fork.c:1529 [inline]
copy_process+0x4081/0x7650 kernel/fork.c:2169
kernel_clone+0xfc/0x960 kernel/fork.c:2599
__do_sys_clone+0xce/0x120 kernel/fork.c:2742
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: 0033:0x7f0fc9985213
RSP: 002b:00007fffedf1a548 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f0fc9985213
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000001
R10: 000055558b9b27d0 R11: 0000000000000246 R12: 0000000000000000
R13: 00000000000927c0 R14: 00000000000537b4 R15: 00007fffedf1a6e0
task:kworker/u8:9 state:R running task stack:24824 pid:6280 tgid:6280 ppid:2 task_flags:0x4208060 flags:0x00004000
Workqueue: kvfree_rcu_reclaim kfree_rcu_monitor
Call Trace:
context_switch kernel/sched/core.c:5397 [inline]
__schedule+0x116a/0x5dd0 kernel/sched/core.c:6786
preempt_schedule_irq+0x51/0x90 kernel/sched/core.c:7109
irqentry_exit+0x36/0x90 kernel/entry/common.c:307
asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:707
RIP: 0010:unwind_next_frame+0xdf/0x20a0 arch/x86/kernel/unwind_orc.c:482
Code: c0 48 8d 05 00 00 00 00 50 b9 02 00 00 00 31 f6 48 c7 c7 00 4e 5c 8e e8 2f b2 2d 00 e8 2a aa 1b 0a 5a 85 c0 0f 85 57 09 00 00 <48> b8 00 00 00 00 00 fc ff df 4d 8d 65 50 4c 89 e2 48 c1 ea 03 80
RSP: 0018:ffffc9000c78f6b8 EFLAGS: 00000202
RAX: 0000000000000001 RBX: 0000000000000001 RCX: 00000000b7ed3fc0
RDX: 0000000000000000 RSI: ffffffff8c157360 RDI: ffffffff8df3dda8
RBP: ffffc9000c78f770 R08: b40229bfbd9c2fa9 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: ffffffff81a78cf0
R13: ffffc9000c78f728 R14: 0000000000000000 R15: ffff888027638000
arch_stack_walk+0x94/0x100 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0x8e/0xc0 kernel/stacktrace.c:122
kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
kasan_save_track+0x14/0x30 mm/kasan/common.c:68
kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:576
poison_slab_object mm/kasan/common.c:247 [inline]
__kasan_slab_free+0x51/0x70 mm/kasan/common.c:264
kasan_slab_free include/linux/kasan.h:233 [inline]
slab_free_hook mm/slub.c:2381 [inline]
slab_free_freelist_hook mm/slub.c:2410 [inline]
slab_free_bulk mm/slub.c:4667 [inline]
kmem_cache_free_bulk.part.0+0x383/0x7f0 mm/slub.c:5246
kfree_bulk include/linux/slab.h:794 [inline]
kvfree_rcu_bulk+0x1b7/0x1e0 mm/slab_common.c:1516
kvfree_rcu_drain_ready mm/slab_common.c:1699 [inline]
kfree_rcu_monitor+0x1d0/0x2f0 mm/slab_common.c:1772
process_one_work+0x9cf/0x1b70 kernel/workqueue.c:3238
process_scheduled_works kernel/workqueue.c:3321 [inline]
worker_thread+0x6c8/0xf10 kernel/workqueue.c:3402
kthread+0x3c5/0x780 kernel/kthread.c:464
ret_from_fork+0x5d4/0x6f0 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
task:kworker/u8:2 state:R running task stack:23512 pid:36 tgid:36 ppid:2 task_flags:0x4208160 flags:0x00004000
Workqueue: bat_events batadv_iv_send_outstanding_bat_ogm_packet
Call Trace:
context_switch kernel/sched/core.c:5397 [inline]
__schedule+0x116a/0x5dd0 kernel/sched/core.c:6786
preempt_schedule_irq+0x51/0x90 kernel/sched/core.c:7109
irqentry_exit+0x36/0x90 kernel/entry/common.c:307
asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:707
RIP: 0010:lock_acquire+0x62/0x350 kernel/locking/lockdep.c:5875
Code: 76 37 12 83 f8 07 0f 87 bc 02 00 00 89 c0 48 0f a3 05 32 b6 10 0f 0f 82 74 02 00 00 8b 35 1a e8 10 0f 85 f6 0f 85 8d 00 00 00 <48> 8b 44 24 30 65 48 2b 05 c9 75 37 12 0f 85 c7 02 00 00 48 83 c4
RSP: 0000:ffffc90000ac7a68 EFLAGS: 00000206
RAX: 0000000000000046 RBX: ffffffff8e5c4e00 RCX: 00000000064bb673
RDX: 0000000000000000 RSI: ffffffff8de0aca5 RDI: ffffffff8c1573e0
RBP: 0000000000000002 R08: 2bda80b7b7cf7237 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
rcu_read_lock include/linux/rcupdate.h:841 [inline]
batadv_iv_ogm_slide_own_bcast_window net/batman-adv/bat_iv_ogm.c:762 [inline]
batadv_iv_ogm_schedule_buff+0x5b4/0x14e0 net/batman-adv/bat_iv_ogm.c:833
batadv_iv_ogm_schedule net/batman-adv/bat_iv_ogm.c:876 [inline]
batadv_iv_ogm_schedule net/batman-adv/bat_iv_ogm.c:869 [inline]
batadv_iv_send_outstanding_bat_ogm_packet+0x329/0x920 net/batman-adv/bat_iv_ogm.c:1720
process_one_work+0x9cf/0x1b70 kernel/workqueue.c:3238
process_scheduled_works kernel/workqueue.c:3321 [inline]
worker_thread+0x6c8/0xf10 kernel/workqueue.c:3402
kthread+0x3c5/0x780 kernel/kthread.c:464
ret_from_fork+0x5d4/0x6f0 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
rcu: rcu_preempt kthread starved for 10502 jiffies! g26485 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:27784 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5397 [inline]
__schedule+0x116a/0x5dd0 kernel/sched/core.c:6786
__schedule_loop kernel/sched/core.c:6864 [inline]
schedule+0xe7/0x3a0 kernel/sched/core.c:6879
schedule_timeout+0x123/0x290 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x1ea/0xb00 kernel/rcu/tree.c:2054
rcu_gp_kthread+0x270/0x380 kernel/rcu/tree.c:2256
kthread+0x3c5/0x780 kernel/kthread.c:464
ret_from_fork+0x5d4/0x6f0 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:
CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted 6.16.0-rc7-syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:pv_native_safe_halt+0xf/0x20 arch/x86/kernel/paravirt.c:82
Code: 6b 6d 02 e9 83 fb 02 00 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d 43 89 23 00 fb f4 cc cc cc cc 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90
RSP: 0018:ffffffff8e207e08 EFLAGS: 000002c6
RAX: 00000000014fe69b RBX: 0000000000000000 RCX: ffffffff8b868c99
RDX: 0000000000000000 RSI: ffffffff8de2ff26 RDI: ffffffff8c1573e0
RBP: fffffbfff1c52ef0 R08: 0000000000000001 R09: ffffed1017086645
R10: ffff8880b843322b R11: 0000000000000001 R12: 0000000000000000
R13: ffffffff8e297780 R14: ffffffff90a94050 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff888124720000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2fe0eff8 CR3: 00000000377f4000 CR4: 00000000003526f0
Call Trace:
arch_safe_halt arch/x86/include/asm/paravirt.h:107 [inline]
default_idle+0x13/0x20 arch/x86/kernel/process.c:749
default_idle_call+0x6d/0xb0 kernel/sched/idle.c:117
cpuidle_idle_call kernel/sched/idle.c:185 [inline]
do_idle+0x391/0x510 kernel/sched/idle.c:325
cpu_startup_entry+0x4f/0x60 kernel/sched/idle.c:423
rest_init+0x16b/0x2b0 init/main.c:745
start_kernel+0x3ee/0x4d0 init/main.c:1102
x86_64_start_reservations+0x18/0x30 arch/x86/kernel/head64.c:307
x86_64_start_kernel+0x130/0x190 arch/x86/kernel/head64.c:288
common_startup_64+0x13e/0x148