rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 1-...!: (1 GPs behind) idle=f96c/1/0x4000000000000000 softirq=17257/17262 fqs=0
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P5956/1:b..l P5853/1:b..l
rcu: (detected by 0, t=10502 jiffies, g=14161, q=1103 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 13 Comm: kworker/u8:1 Not tainted 6.16.0-syzkaller-06574-gd9104cec3e8f #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Workqueue: bat_events batadv_nc_worker
RIP: 0010:__run_hrtimer kernel/time/hrtimer.c:1759 [inline]
RIP: 0010:__hrtimer_run_queues+0x499/0xc60 kernel/time/hrtimer.c:1825
Code: 10 e8 2b b2 f8 ff 84 c0 74 0e e8 c2 02 12 00 eb 19 e8 bb 02 12 00 eb 12 80 3d 5a bd dc 0d 01 0f 85 9d 02 00 00 e8 a7 02 12 00 <4d> 8d 6c 24 3b 4c 89 e8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df
RSP: 0018:ffffc90000a08d40 EFLAGS: 00000006
RAX: ffffffff81adadee RBX: ffff8880b8727c48 RCX: ffff88801d2e0000
RDX: 0000000000010000 RSI: ffffffff8be309e0 RDI: ffffffff8be309a0
RBP: ffffc90000a08e90 R08: ffffffff8fa07af7 R09: 1ffffffff1f40f5e
R10: dffffc0000000000 R11: fffffbfff1f40f5f R12: ffff88807c44e340
R13: 0000000000000000 R14: ffffffff899103e0 R15: 0000000000000001
FS: 0000000000000000(0000) GS:ffff888125d80000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000600 CR3: 0000000075386000 CR4: 00000000003526f0
Call Trace:
hrtimer_interrupt+0x45b/0xaa0 kernel/time/hrtimer.c:1887
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1039 [inline]
__sysvec_apic_timer_interrupt+0x108/0x410 arch/x86/kernel/apic/apic.c:1056
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1050
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:lock_release+0x2b5/0x3e0 kernel/locking/lockdep.c:5893
Code: 51 48 c7 44 24 20 00 00 00 00 9c 8f 44 24 20 f7 44 24 20 00 02 00 00 75 56 f7 c3 00 02 00 00 74 01 fb 65 48 8b 05 5b 7c fc 10 <48> 3b 44 24 28 0f 85 8b 00 00 00 48 83 c4 30 5b 41 5c 41 5d 41 5e
RSP: 0018:ffffc900001279b8 EFLAGS: 00000206
RAX: 6a74d0f8070a0f00 RBX: 0000000000000202 RCX: 6a74d0f8070a0f00
RDX: 0000000000000002 RSI: ffffffff8db65e8b RDI: ffffffff8be30a00
RBP: ffff88801d2e0b40 R08: 0000000000000000 R09: ffffffff8b3d68c2
R10: dffffc0000000000 R11: ffffffff8b3d67f0 R12: 0000000000000002
R13: 0000000000000002 R14: ffffffff8e13c4e0 R15: ffff88801d2e0000
rcu_lock_release include/linux/rcupdate.h:341 [inline]
rcu_read_unlock include/linux/rcupdate.h:871 [inline]
batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:412 [inline]
batadv_nc_worker+0x28c/0x610 net/batman-adv/network-coding.c:719
process_one_work kernel/workqueue.c:3238 [inline]
process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3321
worker_thread+0x8a0/0xda0 kernel/workqueue.c:3402
kthread+0x70e/0x8a0 kernel/kthread.c:464
ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.192 msecs
task:strace-static-x state:R running task stack:21832 pid:5853 tgid:5853 ppid:5852 task_flags:0x400100 flags:0x00004002
Call Trace:
context_switch kernel/sched/core.c:5351 [inline]
__schedule+0x1737/0x4d30 kernel/sched/core.c:6954
preempt_schedule_common+0x83/0xd0 kernel/sched/core.c:7138
preempt_schedule+0xae/0xc0 kernel/sched/core.c:7162
preempt_schedule_thunk+0x16/0x30 arch/x86/entry/thunk.S:12
sock_gen_cookie include/linux/sock_diag.h:42 [inline]
sock_diag_save_cookie+0x9b/0xd0 net/core/sock_diag.c:59
sk_diag_fill+0x358/0xab0 net/netlink/diag.c:67
__netlink_diag_dump+0x2c7/0x620 net/netlink/diag.c:137
netlink_diag_dump+0x15a/0x230 net/netlink/diag.c:197
netlink_dump+0x6e4/0xe90 net/netlink/af_netlink.c:2327
__netlink_dump_start+0x5cb/0x7e0 net/netlink/af_netlink.c:2442
netlink_dump_start include/linux/netlink.h:341 [inline]
netlink_diag_handler_dump+0x181/0x220 net/netlink/diag.c:238
sock_diag_rcv_msg+0x4cc/0x600 net/core/sock_diag.c:-1
netlink_rcv_skb+0x205/0x470 net/netlink/af_netlink.c:2552
netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline]
netlink_unicast+0x82c/0x9e0 net/netlink/af_netlink.c:1346
netlink_sendmsg+0x805/0xb30 net/netlink/af_netlink.c:1896
sock_sendmsg_nosec net/socket.c:714 [inline]
__sock_sendmsg+0x219/0x270 net/socket.c:729
____sys_sendmsg+0x505/0x830 net/socket.c:2614
___sys_sendmsg+0x21f/0x2a0 net/socket.c:2668
__sys_sendmsg net/socket.c:2700 [inline]
__do_sys_sendmsg net/socket.c:2705 [inline]
__se_sys_sendmsg net/socket.c:2703 [inline]
__x64_sys_sendmsg+0x19b/0x260 net/socket.c:2703
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x4eb2b3
RSP: 002b:00007ffd795bffc8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000004eb2b3
RDX: 0000000000000000 RSI: 00007ffd795bfff0 RDI: 0000000000000003
RBP: 00007ffd795bfff0 R08: 0000000000001427 R09: 000000000057ecbe
R10: 000000000045b440 R11: 0000000000000246 R12: 000000000057ecbe
R13: 0000000000000013 R14: 0000000000626480 R15: 0000000000626648
task:udevd state:R running task stack:25096 pid:5956 tgid:5956 ppid:5207 task_flags:0x400140 flags:0x00004002
Call Trace:
context_switch kernel/sched/core.c:5351 [inline]
__schedule+0x1737/0x4d30 kernel/sched/core.c:6954
preempt_schedule_common+0x83/0xd0 kernel/sched/core.c:7138
preempt_schedule+0xae/0xc0 kernel/sched/core.c:7162
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+0x3f/0x50 kernel/locking/spinlock.c:186
spin_unlock include/linux/spinlock.h:391 [inline]
wp_page_copy mm/memory.c:3688 [inline]
do_wp_page+0x1d1d/0x5800 mm/memory.c:4048
handle_pte_fault mm/memory.c:6103 [inline]
__handle_mm_fault+0x1144/0x5620 mm/memory.c:6230
handle_mm_fault+0x40a/0x8e0 mm/memory.c:6399
do_user_addr_fault+0xa81/0x1390 arch/x86/mm/fault.c:1336
handle_page_fault arch/x86/mm/fault.c:1476 [inline]
exc_page_fault+0x76/0xf0 arch/x86/mm/fault.c:1532
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0033:0x7f83c24b5b37
RSP: 002b:00007ffddd3e9ef0 EFLAGS: 00010246
RAX: 000055be61ca7110 RBX: 0000000000003db0 RCX: 0000000000003db1
RDX: 00007f83c25f2220 RSI: 000055be61ca7110 RDI: 000055be61c925e0
RBP: 00007f83c25f1ac0 R08: 0000000000003db0 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 000055be61c8fe80
R13: 00007f83c25f1ac0 R14: 0000000000003db0 R15: 00007f83c25f1ac0
rcu: rcu_preempt kthread starved for 10502 jiffies! g14161 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:26600 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5351 [inline]
__schedule+0x1737/0x4d30 kernel/sched/core.c:6954
__schedule_loop kernel/sched/core.c:7036 [inline]
schedule+0x165/0x360 kernel/sched/core.c:7051
schedule_timeout+0x12b/0x270 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x301/0x1540 kernel/rcu/tree.c:2054
rcu_gp_kthread+0x99/0x390 kernel/rcu/tree.c:2256
kthread+0x70e/0x8a0 kernel/kthread.c:464
ret_from_fork+0x3fc/0x770 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: 59 Comm: kworker/u8:4 Not tainted 6.16.0-syzkaller-06574-gd9104cec3e8f #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Workqueue: events_unbound toggle_allocation_gate
RIP: 0010:csd_lock_wait kernel/smp.c:342 [inline]
RIP: 0010:smp_call_function_many_cond+0xd33/0x12d0 kernel/smp.c:877
Code: 45 8b 2c 24 44 89 ee 83 e6 01 31 ff e8 06 70 0b 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 b1 6b 0b 00 eb 38 f3 90 <42> 0f b6 04 2b 84 c0 75 11 41 f7 04 24 01 00 00 00 74 1e e8 95 6b
RSP: 0018:ffffc9000210f660 EFLAGS: 00000293
RAX: ffffffff81b4451b RBX: 1ffff110170e7f59 RCX: ffff8880222fbc00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc9000210f7e0 R08: ffffffff8fa07af7 R09: 1ffffffff1f40f5e
R10: dffffc0000000000 R11: fffffbfff1f40f5f R12: ffff8880b873fac8
R13: dffffc0000000000 R14: ffff8880b863b180 R15: 0000000000000001
FS: 0000000000000000(0000) GS:ffff888125c80000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055be61ca7128 CR3: 000000000df38000 CR4: 00000000003526f0
Call Trace:
on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1044
on_each_cpu include/linux/smp.h:71 [inline]
smp_text_poke_sync_each_cpu arch/x86/kernel/alternative.c:2691 [inline]
smp_text_poke_batch_finish+0x5f9/0x1130 arch/x86/kernel/alternative.c:2901
arch_jump_label_transform_apply+0x1c/0x30 arch/x86/kernel/jump_label.c:146
static_key_disable_cpuslocked+0xc5/0x1b0 kernel/jump_label.c:240
static_key_disable+0x1a/0x20 kernel/jump_label.c:248
toggle_allocation_gate+0x1a1/0x240 mm/kfence/core.c:855
process_one_work kernel/workqueue.c:3238 [inline]
process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3321
worker_thread+0x8a0/0xda0 kernel/workqueue.c:3402
kthread+0x70e/0x8a0 kernel/kthread.c:464
ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245