rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P6989/1:b..l P6122/1:b..l
rcu: (detected by 0, t=10502 jiffies, g=22745, q=616 ncpus=1)
task:kworker/u4:8 state:R running task stack:24360 pid:6122 ppid:2 flags:0x00004000
Workqueue: bat_events batadv_nc_worker
Call Trace:
context_switch kernel/sched/core.c:5382 [inline]
__schedule+0x15ae/0x4660 kernel/sched/core.c:6701
preempt_schedule_irq+0xbf/0x150 kernel/sched/core.c:7011
irqentry_exit+0x67/0x70 kernel/entry/common.c:438
asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:678
RIP: 0010:lock_acquire+0x208/0x420 kernel/locking/lockdep.c:5758
Code: f7 84 24 80 00 00 00 00 02 00 00 43 c6 44 3c 04 f8 0f 85 f0 00 00 00 41 f7 c6 00 02 00 00 74 01 fb 48 c7 44 24 60 0e 36 e0 45 <4b> c7 04 3c 00 00 00 00 43 c7 44 3c 08 00 00 00 00 65 48 8b 04 25
RSP: 0000:ffffc900050d79c0 EFLAGS: 00000206
RAX: 0000000000000001 RBX: 0000000000000000 RCX: c1491ff230727b00
RDX: 0000000000000000 RSI: ffffffff8acadd60 RDI: ffffffff8b1d3360
RBP: ffffc900050d7ae0 R08: dffffc0000000000 R09: 1ffffffff223dea0
R10: dffffc0000000000 R11: fffffbfff223dea1 R12: 1ffff92000a1af44
R13: ffffffff8d131da0 R14: 0000000000000246 R15: dffffc0000000000
rcu_lock_acquire include/linux/rcupdate.h:334 [inline]
rcu_read_lock include/linux/rcupdate.h:786 [inline]
batadv_nc_process_nc_paths+0xdb/0x380 net/batman-adv/network-coding.c:687
batadv_nc_worker+0x423/0x600 net/batman-adv/network-coding.c:728
process_one_work kernel/workqueue.c:2657 [inline]
process_scheduled_works+0xa60/0x1600 kernel/workqueue.c:2734
worker_thread+0xa5e/0xfe0 kernel/workqueue.c:2815
kthread+0x2fa/0x390 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
task:sed state:R running task stack:24360 pid:6989 ppid:6988 flags:0x00004002
Call Trace:
context_switch kernel/sched/core.c:5382 [inline]
__schedule+0x15ae/0x4660 kernel/sched/core.c:6701
preempt_schedule_irq+0xbf/0x150 kernel/sched/core.c:7011
irqentry_exit+0x67/0x70 kernel/entry/common.c:438
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:lock_acquire+0x208/0x420 kernel/locking/lockdep.c:5758
Code: f7 84 24 80 00 00 00 00 02 00 00 43 c6 44 3c 04 f8 0f 85 f0 00 00 00 41 f7 c6 00 02 00 00 74 01 fb 48 c7 44 24 60 0e 36 e0 45 <4b> c7 04 3c 00 00 00 00 43 c7 44 3c 08 00 00 00 00 65 48 8b 04 25
RSP: 0018:ffffc9000370f860 EFLAGS: 00000206
RAX: 0000000000000001 RBX: 0000000000000000 RCX: 0b456d61070dbb00
RDX: 0000000000000000 RSI: ffffffff8acadd60 RDI: ffffffff8b1d3360
RBP: ffffc9000370f978 R08: dffffc0000000000 R09: 1ffffffff223dea0
R10: dffffc0000000000 R11: fffffbfff223dea1 R12: 1ffff920006e1f18
R13: ffffffff8d131da0 R14: 0000000000000246 R15: dffffc0000000000
rcu_lock_acquire include/linux/rcupdate.h:334 [inline]
rcu_read_lock include/linux/rcupdate.h:786 [inline]
get_obj_cgroup_from_current+0xf0/0x280 mm/memcontrol.c:3058
memcg_slab_pre_alloc_hook mm/slab.h:492 [inline]
slab_pre_alloc_hook+0x8c/0x300 mm/slab.h:719
slab_alloc_node mm/slub.c:3477 [inline]
slab_alloc mm/slub.c:3503 [inline]
__kmem_cache_alloc_lru mm/slub.c:3510 [inline]
kmem_cache_alloc+0x5a/0x2c0 mm/slub.c:3519
vma_lock_alloc kernel/fork.c:461 [inline]
vm_area_alloc+0x10e/0x1d0 kernel/fork.c:492
__mmap_region mm/mmap.c:2770 [inline]
mmap_region+0xcfa/0x2090 mm/mmap.c:2941
do_mmap+0x98f/0x10a0 mm/mmap.c:1385
vm_mmap_pgoff+0x1c4/0x3f0 mm/util.c:556
ksys_mmap_pgoff+0x4c9/0x720 mm/mmap.c:1431
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f36f26ef242
RSP: 002b:00007ffc81af9f08 EFLAGS: 00000206 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007f36f23c2000 RCX: 00007f36f26ef242
RDX: 0000000000000003 RSI: 0000000000002000 RDI: 00007f36f23c2000
RBP: 0000000000000812 R08: 0000000000000003 R09: 000000000005f000
R10: 0000000000000812 R11: 0000000000000206 R12: 00007ffc81af9fc8
R13: 00007f36f23ce6b0 R14: 00007ffc81afa340 R15: 00000fff9035f3e4
rcu: rcu_preempt kthread starved for 10502 jiffies! g22745 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:26664 pid:17 ppid:2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5382 [inline]
__schedule+0x15ae/0x4660 kernel/sched/core.c:6701
schedule+0xbd/0x170 kernel/sched/core.c:6775
schedule_timeout+0x188/0x2d0 kernel/time/timer.c:2168
rcu_gp_fqs_loop+0x30d/0x1590 kernel/rcu/tree.c:1667
rcu_gp_kthread+0x9d/0x3b0 kernel/rcu/tree.c:1866
kthread+0x2fa/0x390 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
rcu: Stack dump where RCU GP kthread last ran:
CPU: 0 PID: 6990 Comm: vhost-6986 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:lock_acquire+0x208/0x420 kernel/locking/lockdep.c:5758
Code: f7 84 24 80 00 00 00 00 02 00 00 43 c6 44 3c 04 f8 0f 85 f0 00 00 00 41 f7 c6 00 02 00 00 74 01 fb 48 c7 44 24 60 0e 36 e0 45 <4b> c7 04 3c 00 00 00 00 43 c7 44 3c 08 00 00 00 00 65 48 8b 04 25
RSP: 0018:ffffc90003087720 EFLAGS: 00000206
RAX: 0000000000000001 RBX: 0000000000000000 RCX: 8454f25b3eb5cc00
RDX: 0000000000000000 RSI: ffffffff8acadd60 RDI: ffffffff8b1d3360
RBP: ffffc90003087828 R08: dffffc0000000000 R09: 1ffffffff223dea6
R10: dffffc0000000000 R11: fffffbfff223dea7 R12: 1ffff92000610ef0
R13: ffff88801c38e0a0 R14: 0000000000000246 R15: dffffc0000000000
FS: 00007f91cf67a6c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f36f23caa10 CR3: 000000005ef85000 CR4: 00000000003506f0
Call Trace:
internal_get_user_pages_fast+0x1fc/0x27a0 mm/gup.c:3209
set_bit_to_user drivers/vhost/vhost.c:2202 [inline]
log_write+0xc3/0x370 drivers/vhost/vhost.c:2228
vhost_update_used_flags+0x1c3/0x290 drivers/vhost/vhost.c:2347
vhost_enable_notify+0xb7/0x7e0 drivers/vhost/vhost.c:2907
vhost_vsock_handle_tx_kick+0x2d0/0xde0 drivers/vhost/vsock.c:505
vhost_run_work_list+0x13d/0x1b0 drivers/vhost/vhost.c:419
vhost_task_fn+0x29a/0x3f0 kernel/vhost_task.c:49
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293