rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...0: (1 GPs behind) idle=5ac4/1/0x4000000000000000 softirq=29170/29171 fqs=2100
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:        0          0            0
rcu: 	cputime:        0          0            0   ==> 52550(ms)
rcu: 	(detected by 1, t=10506 jiffies, g=26969, q=102 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 9676 Comm: syz.4.981 Not tainted 6.13.0-syzkaller-00164-g100ceb4817a2 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
RIP: 0010:get_current arch/x86/include/asm/current.h:49 [inline]
RIP: 0010:write_comp_data kernel/kcov.c:245 [inline]
RIP: 0010:__sanitizer_cov_trace_const_cmp1+0x8/0x90 kernel/kcov.c:300
Code: cc cc cc cc 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 4c 8b 04 24 <65> 48 8b 14 25 c0 d4 03 00 65 8b 05 00 5d 64 7e 25 00 01 ff 00 74
RSP: 0018:ffffc90000007d18 EFLAGS: 00000046
RAX: 0000000000010000 RBX: 0000000000000001 RCX: ffffffff818d029d
RDX: ffff888025c03c00 RSI: 0000000000000001 RDI: 0000000000000000
RBP: 0000000000000001 R08: ffffffff818d02c3 R09: 1ffffffff2031a9e
R10: dffffc0000000000 R11: fffffbfff2031a9f R12: 1ffff110170c593b
R13: dffffc0000000000 R14: ffff88805ed75340 R15: ffff8880b862c980
FS:  00007fe423f546c0(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020003c80 CR3: 0000000035d1e000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <IRQ>
 variable_test_bit arch/x86/include/asm/bitops.h:232 [inline]
 arch_test_bit arch/x86/include/asm/bitops.h:239 [inline]
 _test_bit include/asm-generic/bitops/instrumented-non-atomic.h:142 [inline]
 cpumask_test_cpu include/linux/cpumask.h:570 [inline]
 cpu_online include/linux/cpumask.h:1117 [inline]
 trace_hrtimer_cancel include/trace/events/timer.h:317 [inline]
 debug_deactivate+0x83/0x220 kernel/time/hrtimer.c:476
 __run_hrtimer kernel/time/hrtimer.c:1707 [inline]
 __hrtimer_run_queues+0x305/0xd30 kernel/time/hrtimer.c:1803
 hrtimer_interrupt+0x403/0xa40 kernel/time/hrtimer.c:1865
 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:xa_entry include/linux/xarray.h:1220 [inline]
RIP: 0010:xas_find_marked+0x33a/0x10e0 lib/xarray.c:1363
Code: 41 00 00 00 89 de e8 e5 1f df f5 80 fb 40 0f 87 44 09 00 00 e8 d7 1c df f5 48 8d 5c dd 28 48 89 d8 48 c1 e8 03 42 80 3c 28 00 <74> 08 48 89 df e8 dc fc 42 f6 48 8b 2b e8 74 ce 01 00 89 c3 31 ff
RSP: 0018:ffffc9000c70f970 EFLAGS: 00000246
RAX: 1ffff110046834d6 RBX: ffff88802341a6b0 RCX: ffff888025c03c00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000041
RBP: ffff88802341a680 R08: ffffffff8bc057cb R09: 0000000000000000
R10: ffffc9000c70fa80 R11: fffff520018e1f53 R12: ffffffff8ea803a0
R13: dffffc0000000000 R14: 0000000000000000 R15: 1ffff920018e1f4d
 __xa_alloc+0x209/0x3f0 lib/xarray.c:1857
 mnt_alloc_id fs/namespace.c:272 [inline]
 alloc_vfsmnt+0x63/0x490 fs/namespace.c:345
 clone_mnt+0x6b/0xc90 fs/namespace.c:1332
 copy_tree+0x482/0x940 fs/namespace.c:2209
 copy_mnt_ns+0x185/0x960 fs/namespace.c:3998
 create_new_namespaces+0xd3/0x7b0 kernel/nsproxy.c:78
 unshare_nsproxy_namespaces+0x124/0x180 kernel/nsproxy.c:228
 ksys_unshare+0x57d/0xa70 kernel/fork.c:3333
 __do_sys_unshare kernel/fork.c:3404 [inline]
 __se_sys_unshare kernel/fork.c:3402 [inline]
 __x64_sys_unshare+0x38/0x40 kernel/fork.c:3402
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe423185d29
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fe423f54038 EFLAGS: 00000246 ORIG_RAX: 0000000000000110
RAX: ffffffffffffffda RBX: 00007fe423376080 RCX: 00007fe423185d29
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000022020400
RBP: 00007fe423201b08 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000001 R14: 00007fe423376080 R15: 00007fff90758c18
 </TASK>