rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 1-.... } 3181 jiffies s: 393845 root: 0x2/.
rcu: blocking rcu_node structures (internal RCU debug):
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 4243 Comm: syz.6.10298 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:_test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline]
RIP: 0010:hlock_class kernel/locking/lockdep.c:228 [inline]
RIP: 0010:__lock_acquire+0x10ab/0x7d10 kernel/locking/lockdep.c:5045
Code: 48 8b 44 24 78 48 8d 58 f8 48 89 d8 48 c1 e8 03 42 0f b6 04 00 84 c0 0f 85 16 5e 00 00 8b 03 89 c3 81 e3 ff 1f 00 00 c1 e8 03 <25> f8 03 00 00 48 8d b8 40 32 af 90 be 08 00 00 00 e8 bf 08 6f 00
RSP: 0018:ffffc900001e0620 EFLAGS: 00000007
RAX: 000000000000847d RBX: 00000000000003ef RCX: 00000000b4f111dd
RDX: 000000006113b3c1 RSI: 000000001b4748a4 RDI: ffffffff90af32b8
RBP: ffffc900001e0870 R08: dffffc0000000000 R09: 1ffffffff215e657
R10: dffffc0000000000 R11: fffffbfff215e658 R12: 000000001c5eb4dd
R13: 00000000f2321742 R14: 00000000a8f2e307 R15: ffff88805341e410
FS:  00007f0b80d346c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f5abd423ff8 CR3: 000000007e763000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000008d24 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 lock_acquire+0x1bb/0x4a0 kernel/locking/lockdep.c:5662
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
 _raw_spin_lock_irqsave+0xb0/0x100 kernel/locking/spinlock.c:162
 dsp_cmx_send+0x22/0x1b30 drivers/isdn/mISDN/dsp_cmx.c:1643
 call_timer_fn+0x1ac/0x670 kernel/time/timer.c:1701
 expire_timers kernel/time/timer.c:1752 [inline]
 __run_timers+0x53e/0x800 kernel/time/timer.c:2023
 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:2036
 handle_softirqs+0x2a1/0x930 kernel/softirq.c:596
 __do_softirq kernel/softirq.c:630 [inline]
 invoke_softirq kernel/softirq.c:470 [inline]
 __irq_exit_rcu+0x13b/0x230 kernel/softirq.c:679
 irq_exit_rcu+0x5/0x20 kernel/softirq.c:691
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline]
 sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1118
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:trace_event_get_offsets_lock include/trace/events/lock.h:50 [inline]
RIP: 0010:perf_trace_lock+0xac/0x390 include/trace/events/lock.h:50
Code: c6 44 25 08 04 c7 84 24 80 00 00 00 00 00 00 00 48 89 74 24 38 48 8d 5e 18 48 89 d8 48 c1 e8 03 48 89 44 24 28 42 80 3c 20 00 <74> 08 48 89 df e8 aa e2 6f 00 48 89 5c 24 30 48 8b 03 48 85 c0 48
RSP: 0018:ffffc900040c7300 EFLAGS: 00000246
RAX: 1ffff1100bd076d2 RBX: ffff88805e83b690 RCX: dffffc0000000000
RDX: ffffffff81bf2fce RSI: ffff88805e83b678 RDI: ffffffff8c9f9580
RBP: ffffc900040c73f0 R08: ffffffff8e1fc32f R09: 1ffffffff1c3f865
R10: dffffc0000000000 R11: fffffbfff1c3f866 R12: dffffc0000000000
R13: 1ffff92000818e68 R14: 0000000000000001 R15: ffffffff8c9f9580
 trace_lock_release include/trace/events/lock.h:69 [inline]
 lock_release+0x8ad/0x920 kernel/locking/lockdep.c:5673
 __raw_spin_unlock include/linux/spinlock_api_smp.h:141 [inline]
 _raw_spin_unlock+0x12/0x40 kernel/locking/spinlock.c:186
 spin_unlock include/linux/spinlock.h:391 [inline]
 copy_pte_range mm/memory.c:1113 [inline]
 copy_pmd_range mm/memory.c:1177 [inline]
 copy_pud_range mm/memory.c:1214 [inline]
 copy_p4d_range mm/memory.c:1238 [inline]
 copy_page_range+0x2f7e/0x3900 mm/memory.c:1332
 dup_mmap kernel/fork.c:702 [inline]
 dup_mm kernel/fork.c:1546 [inline]
 copy_mm+0xec3/0x1690 kernel/fork.c:1595
 copy_process+0x1979/0x4030 kernel/fork.c:2356
 kernel_clone+0x24b/0x900 kernel/fork.c:2762
 __do_sys_clone kernel/fork.c:2903 [inline]
 __se_sys_clone kernel/fork.c:2887 [inline]
 __x64_sys_clone+0x1a7/0x220 kernel/fork.c:2887
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f0b7fd9acb9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f0b80d33fd8 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007f0b80015fa0 RCX: 00007f0b7fd9acb9
RDX: 0000200000000200 RSI: 0000200000000000 RDI: 0000000000000000
RBP: 00007f0b7fe08bf7 R08: 0000200000000500 R09: 0000200000000500
R10: 0000200000000240 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f0b80016038 R14: 00007f0b80015fa0 R15: 00007ffe2152a4a8
 </TASK>