rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (0 ticks this GP) idle=1924/1/0x4000000000000002 softirq=160998/160998 fqs=0
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P3762
	(detected by 1, t=10502 jiffies, g=198769, q=2526 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 3762 Comm: syz.1.9134 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:check_region_inline mm/kasan/generic.c:169 [inline]
RIP: 0010:kasan_check_range+0xc/0x290 mm/kasan/generic.c:189
Code: c0 c3 0f 0b b8 ea ff ff ff c3 0f 0b b8 ea ff ff ff c3 00 00 cc cc 00 00 cc cc 00 00 cc cc b0 01 48 85 f6 0f 84 ac 01 00 00 55 <41> 57 41 56 41 54 53 49 89 f8 49 01 f0 0f 82 0e 02 00 00 49 89 f8
RSP: 0018:ffffc900000071f0 EFLAGS: 00000002
RAX: 0000000000000001 RBX: 000000000000002c RCX: ffffffff81644af1
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff90aff240
RBP: ffffc90000007450 R08: dffffc0000000000 R09: 0000000000000001
R10: dffffc0000000000 R11: fffffbfff1c4053e R12: ffff8880302eda00
R13: 0000000000000000 R14: 0000000000000000 R15: 000000000000002c
FS:  00007fd1761c96c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000077b85000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 instrument_atomic_read include/linux/instrumented.h:72 [inline]
 _test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline]
 hlock_class kernel/locking/lockdep.c:228 [inline]
 check_wait_context kernel/locking/lockdep.c:4723 [inline]
 __lock_acquire+0x541/0x7d10 kernel/locking/lockdep.c:4999
 lock_acquire+0x1bb/0x4a0 kernel/locking/lockdep.c:5662
 rcu_lock_acquire include/linux/rcupdate.h:350 [inline]
 rcu_read_lock include/linux/rcupdate.h:791 [inline]
 __perf_output_begin kernel/events/ring_buffer.c:163 [inline]
 perf_output_begin_forward+0xc3/0xa80 kernel/events/ring_buffer.c:272
 __perf_event_output kernel/events/core.c:7732 [inline]
 perf_event_output_forward+0x1ad/0x2f0 kernel/events/core.c:7750
 __perf_event_overflow+0x448/0x610 kernel/events/core.c:9496
 perf_swevent_overflow kernel/events/core.c:9579 [inline]
 perf_swevent_event+0x315/0x570 kernel/events/core.c:9630
 perf_tp_event+0x3e7/0xc30 kernel/events/core.c:10064
 perf_trace_run_bpf_submit+0xf3/0x1c0 kernel/events/core.c:10032
 perf_trace_preemptirq_template+0x268/0x320 include/trace/events/preemptirq.h:14
 trace_irq_enable_rcuidle+0xd3/0x140 include/trace/events/preemptirq.h:40
 trace_hardirqs_on+0x24/0x40 kernel/trace/trace_preemptirq.c:44
 asm_sysvec_irq_work+0x16/0x20 arch/x86/include/asm/idtentry.h:728
RIP: 0010:variable_ffs arch/x86/include/asm/bitops.h:319 [inline]
RIP: 0010:handle_softirqs+0x1c8/0x930 kernel/softirq.c:584
Code: 89 7c 24 44 0f b7 db 48 c7 c7 80 10 8b 8a e8 0f 00 e0 08 65 66 c7 05 65 34 b4 7e 00 00 e8 40 79 39 00 fb 49 c7 c6 c0 a0 80 8c <89> 5c 24 4c b8 ff ff ff ff 0f bc 44 24 4c 41 89 c5 41 ff c5 0f 84
RSP: 0018:ffffc90000007e00 EFLAGS: 00000286
RAX: 39d1cd1211211600 RBX: 0000000000000200 RCX: 39d1cd1211211600
RDX: dffffc0000000000 RSI: ffffffff8a8c1aa0 RDI: ffffffff8adf2060
RBP: ffffc90000007f30 R08: ffff8880b8e3580b R09: 1ffff110171c6b01
R10: dffffc0000000000 R11: ffffed10171c6b02 R12: dffffc0000000000
R13: 0000000000000000 R14: ffffffff8c80a0c0 R15: 000000000000000a
 __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:native_save_fl arch/x86/include/asm/irqflags.h:35 [inline]
RIP: 0010:arch_local_save_flags arch/x86/include/asm/irqflags.h:70 [inline]
RIP: 0010:arch_local_irq_save arch/x86/include/asm/irqflags.h:106 [inline]
RIP: 0010:rcu_read_unlock_special+0xdc/0x510 kernel/rcu/tree_plugin.h:640
Code: 65 d8 5b 41 5c 41 5d 41 5e 41 5f 5d c3 49 89 ff 42 c6 44 2b 08 00 48 c7 84 24 80 00 00 00 00 00 00 00 9c 8f 84 24 80 00 00 00 <4c> 8b a4 24 80 00 00 00 42 c6 44 2b 08 f8 fa 41 f7 c4 00 02 00 00
RSP: 0018:ffffc90003fbf4e0 EFLAGS: 00000246
RAX: f2f2f2f8f1f1f1f1 RBX: 1ffff920007f7ea4 RCX: 39d1cd1211211600
RDX: 0000000000000000 RSI: ffffffff8adf2040 RDI: ffff8880302eda00
RBP: ffffc90003fbf5d0 R08: dffffc0000000000 R09: 1ffffffff215fe48
R10: dffffc0000000000 R11: fffffbfff215fe49 R12: 1ffff1100605dbc7
R13: dffffc0000000000 R14: 0000000080000000 R15: ffff8880302eda00
 __rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:426
 rcu_read_unlock include/linux/rcupdate.h:823 [inline]
 percpu_ref_put_many include/linux/percpu-refcount.h:337 [inline]
 percpu_ref_put+0xc8/0x100 include/linux/percpu-refcount.h:351
 slab_alloc_node mm/slub.c:3359 [inline]
 slab_alloc mm/slub.c:3367 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3374 [inline]
 kmem_cache_alloc_lru+0x11a/0x2e0 mm/slub.c:3390
 alloc_inode_sb include/linux/fs.h:3245 [inline]
 alloc_inode fs/inode.c:263 [inline]
 new_inode_pseudo+0x7e/0x1c0 fs/inode.c:1063
 __ns_get_path+0x251/0x650 fs/nsfs.c:80
 ns_get_path_cb fs/nsfs.c:118 [inline]
 ns_get_path+0x50/0x90 fs/nsfs.c:144
 proc_ns_get_link+0xf4/0x200 fs/proc/namespaces.c:61
 pick_link+0x6b3/0xe20 fs/namei.c:-1
 step_into+0xc49/0xf20 fs/namei.c:1876
 open_last_lookups fs/namei.c:3581 [inline]
 path_openat+0x15f3/0x2ee0 fs/namei.c:3788
 do_filp_open+0x1f1/0x430 fs/namei.c:3818
 do_sys_openat2+0x150/0x4b0 fs/open.c:1320
 do_sys_open fs/open.c:1336 [inline]
 __do_sys_openat fs/open.c:1352 [inline]
 __se_sys_openat fs/open.c:1347 [inline]
 __x64_sys_openat+0x135/0x160 fs/open.c:1347
 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: 0033:0x7fd17535d68e
Code: 08 0f 85 a5 a8 ff ff 49 89 fb 48 89 f0 48 89 d7 48 89 ce 4c 89 c2 4d 89 ca 4c 8b 44 24 08 4c 8b 4c 24 10 4c 89 5c 24 08 0f 05 <c3> 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 80 00 00 00 00 48 83 ec 08
RSP: 002b:00007fd1761c8ec8 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007fd1761c96c0 RCX: 00007fd17535d68e
RDX: 0000000000000000 RSI: 00007fd1761c8f90 RDI: ffffffffffffff9c
RBP: 00007fd175432d6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd175616038 R14: 00007fd175615fa0 R15: 00007ffe5aad88b8
 </TASK>
task:syz.1.9134      state:R  running task     stack:25040 pid:3762  ppid:25951  flags:0x0000400c
Call Trace:
 <TASK>
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g198769 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=0 timer-softirq=166339
rcu: rcu_preempt kthread starved for 10502 jiffies! g198769 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I stack:26864 pid:16    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5245 [inline]
 __schedule+0x11d1/0x40e0 kernel/sched/core.c:6562
 schedule+0xb9/0x180 kernel/sched/core.c:6638
 schedule_timeout+0x184/0x2d0 kernel/time/timer.c:2168
 rcu_gp_fqs_loop+0x303/0x1340 kernel/rcu/tree.c:1706
 rcu_gp_kthread+0x99/0x3b0 kernel/rcu/tree.c:1905
 kthread+0x29d/0x330 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 3762 Comm: syz.1.9134 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:rdtsc_ordered arch/x86/include/asm/msr.h:215 [inline]
RIP: 0010:pvclock_clocksource_read+0xe7/0x760 arch/x86/kernel/pvclock.c:76
Code: df 48 89 54 24 38 4c 89 74 24 28 42 0f b6 04 22 84 c0 0f 85 45 01 00 00 43 0f b6 04 26 84 c0 0f 85 7f 01 00 00 8b 1f 0f 01 f9 <66> 90 48 89 d5 48 8b 8c 24 90 00 00 00 42 0f b6 0c 21 84 c9 0f 85
RSP: 0018:ffffc90000007b60 EFLAGS: 00000046
RAX: 00000000dc5635e8 RBX: 0000000000000018 RCX: 0000000000000000
RDX: 00000000000005e6 RSI: ffffffff8fa1401c RDI: ffffffff8fa14000
RBP: ffffc90000007cf8 R08: ffffffff8fa14008 R09: ffffffff8fa14018
R10: ffffffff8fa14010 R11: ffffffff8fa14003 R12: dffffc0000000000
R13: dffffc0000000000 R14: 1ffffffff1f42800 R15: ffffffff8c658980
FS:  00007fd1761c96c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000077b85000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 kvm_clock_read arch/x86/kernel/kvmclock.c:79 [inline]
 kvm_sched_clock_read+0x14/0x40 arch/x86/kernel/kvmclock.c:91
 sched_clock_cpu+0x6e/0x260 kernel/sched/clock.c:369
 irqtime_account_irq+0x6a/0x1b0 kernel/sched/cputime.c:60
 instr_sysvec_irq_work arch/x86/kernel/irq_work.c:17 [inline]
 sysvec_irq_work+0x45/0xc0 arch/x86/kernel/irq_work.c:17
 asm_sysvec_irq_work+0x16/0x20 arch/x86/include/asm/idtentry.h:728
RIP: 0010:variable_ffs arch/x86/include/asm/bitops.h:319 [inline]
RIP: 0010:handle_softirqs+0x1c8/0x930 kernel/softirq.c:584
Code: 89 7c 24 44 0f b7 db 48 c7 c7 80 10 8b 8a e8 0f 00 e0 08 65 66 c7 05 65 34 b4 7e 00 00 e8 40 79 39 00 fb 49 c7 c6 c0 a0 80 8c <89> 5c 24 4c b8 ff ff ff ff 0f bc 44 24 4c 41 89 c5 41 ff c5 0f 84
RSP: 0018:ffffc90000007e00 EFLAGS: 00000286
RAX: 39d1cd1211211600 RBX: 0000000000000200 RCX: 39d1cd1211211600
RDX: dffffc0000000000 RSI: ffffffff8a8c1aa0 RDI: ffffffff8adf2060
RBP: ffffc90000007f30 R08: ffff8880b8e3580b R09: 1ffff110171c6b01
R10: dffffc0000000000 R11: ffffed10171c6b02 R12: dffffc0000000000
R13: 0000000000000000 R14: ffffffff8c80a0c0 R15: 000000000000000a
 __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:native_save_fl arch/x86/include/asm/irqflags.h:35 [inline]
RIP: 0010:arch_local_save_flags arch/x86/include/asm/irqflags.h:70 [inline]
RIP: 0010:arch_local_irq_save arch/x86/include/asm/irqflags.h:106 [inline]
RIP: 0010:rcu_read_unlock_special+0xdc/0x510 kernel/rcu/tree_plugin.h:640
Code: 65 d8 5b 41 5c 41 5d 41 5e 41 5f 5d c3 49 89 ff 42 c6 44 2b 08 00 48 c7 84 24 80 00 00 00 00 00 00 00 9c 8f 84 24 80 00 00 00 <4c> 8b a4 24 80 00 00 00 42 c6 44 2b 08 f8 fa 41 f7 c4 00 02 00 00
RSP: 0018:ffffc90003fbf4e0 EFLAGS: 00000246
RAX: f2f2f2f8f1f1f1f1 RBX: 1ffff920007f7ea4 RCX: 39d1cd1211211600
RDX: 0000000000000000 RSI: ffffffff8adf2040 RDI: ffff8880302eda00
RBP: ffffc90003fbf5d0 R08: dffffc0000000000 R09: 1ffffffff215fe48
R10: dffffc0000000000 R11: fffffbfff215fe49 R12: 1ffff1100605dbc7
R13: dffffc0000000000 R14: 0000000080000000 R15: ffff8880302eda00
 __rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:426
 rcu_read_unlock include/linux/rcupdate.h:823 [inline]
 percpu_ref_put_many include/linux/percpu-refcount.h:337 [inline]
 percpu_ref_put+0xc8/0x100 include/linux/percpu-refcount.h:351
 slab_alloc_node mm/slub.c:3359 [inline]
 slab_alloc mm/slub.c:3367 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3374 [inline]
 kmem_cache_alloc_lru+0x11a/0x2e0 mm/slub.c:3390
 alloc_inode_sb include/linux/fs.h:3245 [inline]
 alloc_inode fs/inode.c:263 [inline]
 new_inode_pseudo+0x7e/0x1c0 fs/inode.c:1063
 __ns_get_path+0x251/0x650 fs/nsfs.c:80
 ns_get_path_cb fs/nsfs.c:118 [inline]
 ns_get_path+0x50/0x90 fs/nsfs.c:144
 proc_ns_get_link+0xf4/0x200 fs/proc/namespaces.c:61
 pick_link+0x6b3/0xe20 fs/namei.c:-1
 step_into+0xc49/0xf20 fs/namei.c:1876
 open_last_lookups fs/namei.c:3581 [inline]
 path_openat+0x15f3/0x2ee0 fs/namei.c:3788
 do_filp_open+0x1f1/0x430 fs/namei.c:3818
 do_sys_openat2+0x150/0x4b0 fs/open.c:1320
 do_sys_open fs/open.c:1336 [inline]
 __do_sys_openat fs/open.c:1352 [inline]
 __se_sys_openat fs/open.c:1347 [inline]
 __x64_sys_openat+0x135/0x160 fs/open.c:1347
 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: 0033:0x7fd17535d68e
Code: 08 0f 85 a5 a8 ff ff 49 89 fb 48 89 f0 48 89 d7 48 89 ce 4c 89 c2 4d 89 ca 4c 8b 44 24 08 4c 8b 4c 24 10 4c 89 5c 24 08 0f 05 <c3> 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 80 00 00 00 00 48 83 ec 08
RSP: 002b:00007fd1761c8ec8 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007fd1761c96c0 RCX: 00007fd17535d68e
RDX: 0000000000000000 RSI: 00007fd1761c8f90 RDI: ffffffffffffff9c
RBP: 00007fd175432d6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd175616038 R14: 00007fd175615fa0 R15: 00007ffe5aad88b8
 </TASK>