rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P11758/1:b..l P20177/1:b..l P3557/1:b..l
rcu: (detected by 0, t=10502 jiffies, g=133449, q=397 ncpus=2)
task:kworker/u4:12 state:R running task stack:19976 pid:3557 ppid:2 flags:0x00004000
Workqueue: bat_events batadv_iv_send_outstanding_bat_ogm_packet
Call Trace:
context_switch kernel/sched/core.c:5381 [inline]
__schedule+0x1553/0x45a0 kernel/sched/core.c:6700
preempt_schedule_irq+0xbf/0x150 kernel/sched/core.c:7010
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:batadv_iv_ogm_schedule_buff net/batman-adv/bat_iv_ogm.c:845 [inline]
RIP: 0010:batadv_iv_ogm_schedule+0x9a9/0xf10 net/batman-adv/bat_iv_ogm.c:870
Code: 03 00 00 48 8b 44 24 40 48 c1 e8 03 48 89 44 24 58 49 8d 5f 78 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 80 3c 08 00 <74> 08 48 89 df e8 cd 17 96 f7 48 8b 1b 48 b8 00 00 00 00 00 fc ff
RSP: 0000:ffffc9000d1579c0 EFLAGS: 00000246
RAX: 1ffff1100f9d920f RBX: ffff88807cec9078 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: ffffffff8b1c8e40 RDI: ffffffff8b1c8e00
RBP: ffffc9000d157b00 R08: dffffc0000000000 R09: 1ffffffff2238aa0
R10: dffffc0000000000 R11: fffffbfff2238aa1 R12: 000000010002329e
R13: ffff88802ce24000 R14: ffff88802ce24078 R15: ffff88807cec9000
batadv_iv_send_outstanding_bat_ogm_packet+0x733/0x850 net/batman-adv/bat_iv_ogm.c:1714
process_one_work kernel/workqueue.c:2653 [inline]
process_scheduled_works+0xa5d/0x15d0 kernel/workqueue.c:2730
worker_thread+0xa55/0xfc0 kernel/workqueue.c:2811
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:modprobe state:R running task stack:24232 pid:20177 ppid:9988 flags:0x00004002
Call Trace:
context_switch kernel/sched/core.c:5381 [inline]
__schedule+0x1553/0x45a0 kernel/sched/core.c:6700
preempt_schedule_common+0x82/0xc0 kernel/sched/core.c:6867
preempt_schedule+0xc0/0xd0 kernel/sched/core.c:6891
preempt_schedule_thunk+0x1a/0x30 arch/x86/entry/thunk_64.S:45
__raw_spin_unlock include/linux/spinlock_api_smp.h:143 [inline]
_raw_spin_unlock+0x3a/0x40 kernel/locking/spinlock.c:186
spin_unlock include/linux/spinlock.h:391 [inline]
change_pte_range mm/mprotect.c:286 [inline]
change_pmd_range mm/mprotect.c:420 [inline]
change_pud_range mm/mprotect.c:453 [inline]
change_p4d_range mm/mprotect.c:476 [inline]
change_protection_range mm/mprotect.c:504 [inline]
change_protection+0x278a/0x3200 mm/mprotect.c:538
mprotect_fixup+0x929/0xca0 mm/mprotect.c:666
do_mprotect_pkey+0x7c2/0xcb0 mm/mprotect.c:819
__do_sys_mprotect mm/mprotect.c:840 [inline]
__se_sys_mprotect mm/mprotect.c:837 [inline]
__x64_sys_mprotect+0x80/0x90 mm/mprotect.c:837
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x55/0xa0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f6ddbe512c7
RSP: 002b:00007fff3740b118 EFLAGS: 00000206 ORIG_RAX: 000000000000000a
RAX: ffffffffffffffda RBX: 00007f6ddbb306b0 RCX: 00007f6ddbe512c7
RDX: 0000000000000001 RSI: 0000000000001000 RDI: 00007f6ddbb24000
RBP: 00007fff3740b3e0 R08: 0000000000000000 R09: 00007f6ddbbc32e0
R10: 00007f6ddbb306b0 R11: 0000000000000206 R12: 0000000000000038
R13: 0000037e56d471c8 R14: 0000000000000000 R15: 00007f6ddbe65310
task:syz-executor state:R running task stack:21320 pid:11758 ppid:11737 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5381 [inline]
__schedule+0x1553/0x45a0 kernel/sched/core.c:6700
preempt_schedule_common+0x82/0xc0 kernel/sched/core.c:6867
preempt_schedule+0xc0/0xd0 kernel/sched/core.c:6891
preempt_schedule_thunk+0x1a/0x30 arch/x86/entry/thunk_64.S:45
__raw_spin_unlock include/linux/spinlock_api_smp.h:143 [inline]
_raw_spin_unlock+0x3a/0x40 kernel/locking/spinlock.c:186
spin_unlock include/linux/spinlock.h:391 [inline]
copy_pte_range mm/memory.c:1107 [inline]
copy_pmd_range mm/memory.c:1168 [inline]
copy_pud_range mm/memory.c:1205 [inline]
copy_p4d_range mm/memory.c:1229 [inline]
copy_page_range+0x2ba0/0x3670 mm/memory.c:1323
dup_mmap kernel/fork.c:768 [inline]
dup_mm kernel/fork.c:1693 [inline]
copy_mm+0x1281/0x1d80 kernel/fork.c:1742
copy_process+0x16f7/0x3d80 kernel/fork.c:2507
kernel_clone+0x24b/0x8a0 kernel/fork.c:2915
__do_sys_clone kernel/fork.c:3058 [inline]
__se_sys_clone kernel/fork.c:3042 [inline]
__x64_sys_clone+0x1b7/0x230 kernel/fork.c:3042
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x55/0xa0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f49c6fc5852
RSP: 002b:00007ffe2e9f93d0 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007ffe2e9f93d0 RCX: 00007f49c6fc5852
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 00007ffe2e9f955c R08: 0000000000000000 R09: 0000000000000001
R10: 000055556b7f07d0 R11: 0000000000000246 R12: 0000000000000001
R13: 00000000000927c0 R14: 00000000001a9099 R15: 00007ffe2e9f95b0
rcu: rcu_preempt kthread starved for 6272 jiffies! g133449 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1
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:27496 pid:17 ppid:2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5381 [inline]
__schedule+0x1553/0x45a0 kernel/sched/core.c:6700
schedule+0xbd/0x170 kernel/sched/core.c:6774
schedule_timeout+0x188/0x2d0 kernel/time/timer.c:2168
rcu_gp_fqs_loop+0x313/0x1590 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:
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 0 Comm: swapper/1 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
RIP: 0010:pv_native_safe_halt+0xf/0x10 arch/x86/kernel/paravirt.c:148
Code: 39 21 02 c3 cc cc cc cc cc cc cc f3 0f 1e fa 0f 0b 66 2e 0f 1f 84 00 00 00 00 00 f3 0f 1e fa 66 90 0f 00 2d e3 f3 41 00 fb f4 66 0f 1f 00 55 41 57 41 56 41 54 53 50 8b 2f eb 2e 41 89 de 80
RSP: 0018:ffffc90000187de0 EFLAGS: 000002c6
RAX: b7742255d2abc000 RBX: ffffffff8162a8f1 RCX: b7742255d2abc000
RDX: 0000000000000001 RSI: ffffffff8acac9e0 RDI: ffffffff8b1c8e60
RBP: ffffc90000187f20 R08: ffff8880b8f36b2b R09: 1ffff110171e6d65
R10: dffffc0000000000 R11: ffffed10171e6d66 R12: 1ffff92000030fc8
R13: dffffc0000000000 R14: 1ffff110036cd780 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000020000004b000 CR3: 00000000192b5000 CR4: 00000000003506e0
Call Trace:
arch_safe_halt arch/x86/include/asm/paravirt.h:108 [inline]
default_idle+0x13/0x20 arch/x86/kernel/process.c:753
default_idle_call+0x6c/0xa0 kernel/sched/idle.c:97
cpuidle_idle_call kernel/sched/idle.c:178 [inline]
do_idle+0x221/0x590 kernel/sched/idle.c:302
cpu_startup_entry+0x43/0x60 kernel/sched/idle.c:401
start_secondary+0xee/0xf0 arch/x86/kernel/smpboot.c:323
secondary_startup_64_no_verify+0x179/0x17b