rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	(detected by 1, t=10502 jiffies, g=41549, q=538 ncpus=2)
rcu: All QSes seen, last rcu_preempt kthread activity 6149 (4294970895-4294964746), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread starved for 6149 jiffies! g41549 f0x2 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:26176 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5366 [inline]
 __schedule+0x1b18/0x50e0 kernel/sched/core.c:6747
 __schedule_loop kernel/sched/core.c:6824 [inline]
 schedule+0x163/0x360 kernel/sched/core.c:6839
 schedule_timeout+0x15b/0x290 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x2e1/0x1340 kernel/rcu/tree.c:2046
 rcu_gp_kthread+0xa7/0x3b0 kernel/rcu/tree.c:2248
 kthread+0x7a9/0x920 kernel/kthread.c:464
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 1 UID: 0 PID: 5832 Comm: syz-executor Not tainted 6.14.0-syzkaller-05884-g2ea396448f26 #0 PREEMPT(full) 
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+0x1bac/0x2d40 kernel/smp.c:885
Code: 03 84 c0 75 7e 45 8b 65 00 44 89 e6 83 e6 01 31 ff e8 b8 02 0c 00 41 83 e4 01 4c 8b 64 24 68 75 07 e8 68 fe 0b 00 eb 41 f3 90 <48> b8 00 00 00 00 00 fc ff df 0f b6 04 03 84 c0 75 11 41 f7 45 00
RSP: 0018:ffffc90003ee74c0 EFLAGS: 00000293
RAX: ffffffff81b7791d RBX: 1ffff110170c820d RCX: ffff88801fbe1e00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc90003ee76c0 R08: ffffffff81b778e8 R09: 1ffffffff20bc88e
R10: dffffc0000000000 R11: fffffbfff20bc88f R12: ffff8880b873ad08
R13: ffff8880b8641068 R14: ffff8880b873ad00 R15: 0000000000000000
FS:  0000555582731500(0000) GS:ffff8881250ea000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa5c064bbd0 CR3: 000000005fe6c000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 </IRQ>
 <TASK>
 on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1052
 __flush_tlb_multi arch/x86/include/asm/paravirt.h:91 [inline]
 flush_tlb_multi arch/x86/mm/tlb.c:1275 [inline]
 flush_tlb_mm_range+0xb8d/0x13f0 arch/x86/mm/tlb.c:1365
 dup_mmap kernel/fork.c:787 [inline]
 dup_mm kernel/fork.c:1700 [inline]
 copy_mm+0x18c5/0x2170 kernel/fork.c:1752
 copy_process+0x17de/0x3d10 kernel/fork.c:2395
 kernel_clone+0x242/0x930 kernel/fork.c:2810
 __do_sys_clone kernel/fork.c:2953 [inline]
 __se_sys_clone kernel/fork.c:2937 [inline]
 __x64_sys_clone+0x268/0x2e0 kernel/fork.c:2937
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa70c9839d3
Code: 1f 84 00 00 00 00 00 64 48 8b 04 25 10 00 00 00 45 31 c0 31 d2 31 f6 bf 11 00 20 01 4c 8d 90 d0 02 00 00 b8 38 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 35 89 c2 85 c0 75 2c 64 48 8b 04 25 10 00 00
RSP: 002b:00007ffeab2d3e58 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fa70c9839d3
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000001
R10: 00005555827317d0 R11: 0000000000000246 R12: 0000000000000000
R13: 00000000000927c0 R14: 0000000000038d46 R15: 00007ffeab2d3ff0
 </TASK>
watchdog: BUG: soft lockup - CPU#1 stuck for 196s! [syz-executor:5832]
Modules linked in:
irq event stamp: 3386590
hardirqs last  enabled at (3386589): [<ffffffff8c241ff3>] irqentry_exit+0x63/0x90 kernel/entry/common.c:357
hardirqs last disabled at (3386590): [<ffffffff8c23fbee>] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1049
softirqs last  enabled at (3386588): [<ffffffff81846efb>] __do_softirq kernel/softirq.c:595 [inline]
softirqs last  enabled at (3386588): [<ffffffff81846efb>] invoke_softirq kernel/softirq.c:435 [inline]
softirqs last  enabled at (3386588): [<ffffffff81846efb>] __irq_exit_rcu+0xfb/0x220 kernel/softirq.c:662
softirqs last disabled at (3386549): [<ffffffff81846efb>] __do_softirq kernel/softirq.c:595 [inline]
softirqs last disabled at (3386549): [<ffffffff81846efb>] invoke_softirq kernel/softirq.c:435 [inline]
softirqs last disabled at (3386549): [<ffffffff81846efb>] __irq_exit_rcu+0xfb/0x220 kernel/softirq.c:662
CPU: 1 UID: 0 PID: 5832 Comm: syz-executor Not tainted 6.14.0-syzkaller-05884-g2ea396448f26 #0 PREEMPT(full) 
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+0x1bac/0x2d40 kernel/smp.c:885
Code: 03 84 c0 75 7e 45 8b 65 00 44 89 e6 83 e6 01 31 ff e8 b8 02 0c 00 41 83 e4 01 4c 8b 64 24 68 75 07 e8 68 fe 0b 00 eb 41 f3 90 <48> b8 00 00 00 00 00 fc ff df 0f b6 04 03 84 c0 75 11 41 f7 45 00
RSP: 0018:ffffc90003ee74c0 EFLAGS: 00000293
RAX: ffffffff81b7791d RBX: 1ffff110170c820d RCX: ffff88801fbe1e00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc90003ee76c0 R08: ffffffff81b778e8 R09: 1ffffffff20bc88e
R10: dffffc0000000000 R11: fffffbfff20bc88f R12: ffff8880b873ad08
R13: ffff8880b8641068 R14: ffff8880b873ad00 R15: 0000000000000000
FS:  0000555582731500(0000) GS:ffff8881250ea000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa5c064bbd0 CR3: 000000005fe6c000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 </IRQ>
 <TASK>
 on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1052
 __flush_tlb_multi arch/x86/include/asm/paravirt.h:91 [inline]
 flush_tlb_multi arch/x86/mm/tlb.c:1275 [inline]
 flush_tlb_mm_range+0xb8d/0x13f0 arch/x86/mm/tlb.c:1365
 dup_mmap kernel/fork.c:787 [inline]
 dup_mm kernel/fork.c:1700 [inline]
 copy_mm+0x18c5/0x2170 kernel/fork.c:1752
 copy_process+0x17de/0x3d10 kernel/fork.c:2395
 kernel_clone+0x242/0x930 kernel/fork.c:2810
 __do_sys_clone kernel/fork.c:2953 [inline]
 __se_sys_clone kernel/fork.c:2937 [inline]
 __x64_sys_clone+0x268/0x2e0 kernel/fork.c:2937
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa70c9839d3
Code: 1f 84 00 00 00 00 00 64 48 8b 04 25 10 00 00 00 45 31 c0 31 d2 31 f6 bf 11 00 20 01 4c 8d 90 d0 02 00 00 b8 38 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 35 89 c2 85 c0 75 2c 64 48 8b 04 25 10 00 00
RSP: 002b:00007ffeab2d3e58 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fa70c9839d3
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000001
R10: 00005555827317d0 R11: 0000000000000246 R12: 0000000000000000
R13: 00000000000927c0 R14: 0000000000038d46 R15: 00007ffeab2d3ff0
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 55 Comm: kworker/u9:0 Not tainted 6.14.0-syzkaller-05884-g2ea396448f26 #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Workqueue: hci4 hci_cmd_timeout
RIP: 0010:__sanitizer_cov_trace_const_cmp2+0x81/0x90 kernel/kcov.c:309
Code: 8d 42 28 4c 39 c8 77 22 89 f8 89 f6 49 ff c2 4c 89 11 48 c7 44 0a 08 03 00 00 00 48 89 44 0a 10 48 89 74 0a 18 4c 89 44 0a 20 <c3> cc cc cc cc 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90
RSP: 0018:ffffc90000007c68 EFLAGS: 00000006
RAX: 0000000000010000 RBX: ffff88807bab9140 RCX: ffff88807bab9140
RDX: ffff888022291e00 RSI: 0000000000000002 RDI: 0000000000000000
RBP: 18319086a813f896 R08: ffffffff8a1a720f R09: fffff52000000f7c
R10: dffffc0000000000 R11: fffff52000000f7c R12: 0000000000000002
R13: 18319086a813f833 R14: ffff88807bab9000 R15: ffff888035428340
FS:  0000000000000000(0000) GS:ffff888124fea000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa5c05736c0 CR3: 0000000027562000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <IRQ>
 advance_sched+0x4df/0xca0 net/sched/sch_taprio.c:960
 __run_hrtimer kernel/time/hrtimer.c:1791 [inline]
 __hrtimer_run_queues+0x5a6/0xd40 kernel/time/hrtimer.c:1855
 hrtimer_interrupt+0x403/0xa40 kernel/time/hrtimer.c:1917
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1038 [inline]
 __sysvec_apic_timer_interrupt+0x110/0x420 arch/x86/kernel/apic/apic.c:1055
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
 sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1049
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:console_flush_all+0x998/0xec0 arch/x86/include/asm/irqflags.h:-1
Code: 48 21 c3 0f 85 16 02 00 00 e8 f4 0d 21 00 4c 8b 7c 24 10 4d 85 f6 75 07 e8 e5 0d 21 00 eb 06 e8 de 0d 21 00 fb 48 8b 5c 24 18 <48> 8b 44 24 30 42 80 3c 28 00 74 08 48 89 df e8 74 43 89 00 4c 8b
RSP: 0018:ffffc9000100f500 EFLAGS: 00000293
RAX: ffffffff81a26982 RBX: ffffffff8f58e178 RCX: ffff888022291e00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc9000100f6b0 R08: ffffffff81a26959 R09: 1ffffffff20bc88e
R10: dffffc0000000000 R11: fffffbfff20bc88f R12: ffffffff8f58e120
R13: dffffc0000000000 R14: 0000000000000200 R15: ffffc9000100f700
 __console_flush_and_unlock kernel/printk/printk.c:3267 [inline]
 console_unlock+0x151/0x3b0 kernel/printk/printk.c:3307
 vprintk_emit+0x732/0xa10 kernel/printk/printk.c:2432
 _printk+0xd5/0x120 kernel/printk/printk.c:2457
 bt_err+0x126/0x180 net/bluetooth/lib.c:296
 hci_cmd_timeout+0xdd/0x1e0 net/bluetooth/hci_core.c:1453
 process_one_work kernel/workqueue.c:3238 [inline]
 process_scheduled_works+0xac3/0x18e0 kernel/workqueue.c:3319
 worker_thread+0x870/0xd30 kernel/workqueue.c:3400
 kthread+0x7a9/0x920 kernel/kthread.c:464
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>