rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 1-...!: (0 ticks this GP) idle=3e04/1/0x4000000000000000 softirq=237478/237478 fqs=106 rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P5817 rcu: (detected by 0, t=10502 jiffies, g=292789, q=2213 ncpus=2) Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 5817 Comm: syz-executor Not tainted 6.13.0-rc4-syzkaller-00110-g4099a71718b0 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 RIP: 0010:hlock_class+0x66/0x130 kernel/locking/lockdep.c:241 Code: d8 48 c1 e8 06 48 8d 3c c5 c0 1c e5 96 e8 02 f8 86 00 48 0f a3 1d 1a 4b 6f 15 73 13 48 69 c3 c8 00 00 00 5b 48 05 e0 20 e5 96 cc cc cc cc 48 c7 c0 a0 c8 84 9a 48 ba 00 00 00 00 00 fc ff df RSP: 0018:ffffc90000a18b30 EFLAGS: 00000082 RAX: ffffffff96e53aa8 RBX: 0000000000000000 RCX: ffffffff8175d19e RDX: fffffbfff2dca399 RSI: 0000000000000008 RDI: ffffffff96e51cc0 RBP: 0000000000000040 R08: 0000000000000000 R09: fffffbfff2dca398 R10: ffffffff96e51cc7 R11: 0000000000000001 R12: ffff888026f28b01 R13: ffff888026f28000 R14: 0000000000000003 R15: ffff888026f28b08 FS: 0000555564fd6500(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000200f3030 CR3: 00000000613f6000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __lock_acquire+0x13a6/0x3c40 kernel/locking/lockdep.c:5222 lock_acquire.part.0+0x11b/0x380 kernel/locking/lockdep.c:5849 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154 spin_lock include/linux/spinlock.h:351 [inline] advance_sched+0xd8/0xc60 net/sched/sch_taprio.c:924 __run_hrtimer kernel/time/hrtimer.c:1739 [inline] __hrtimer_run_queues+0x20a/0xae0 kernel/time/hrtimer.c:1803 hrtimer_interrupt+0x392/0x8e0 kernel/time/hrtimer.c:1865 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1038 [inline] __sysvec_apic_timer_interrupt+0x10f/0x400 arch/x86/kernel/apic/apic.c:1055 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline] sysvec_apic_timer_interrupt+0x9f/0xc0 arch/x86/kernel/apic/apic.c:1049 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline] RIP: 0010:_raw_spin_unlock_irqrestore+0x31/0x80 kernel/locking/spinlock.c:194 Code: f5 53 48 8b 74 24 10 48 89 fb 48 83 c7 18 e8 56 71 4a f6 48 89 df e8 ae f0 4a f6 f7 c5 00 02 00 00 75 23 9c 58 f6 c4 02 75 37 01 00 00 00 e8 95 d5 3b f6 65 8b 05 f6 90 d7 74 85 c0 74 16 5b RSP: 0018:ffffc90003027890 EFLAGS: 00000246 RAX: 0000000000000006 RBX: ffffffff9a9bcaa8 RCX: 1ffffffff20bde71 RDX: 0000000000000000 RSI: ffffffff8b6cd9e0 RDI: ffffffff8bd1ede0 RBP: 0000000000000206 R08: 0000000000000001 R09: 0000000000000001 R10: ffffffff905f36d7 R11: 0000000000000002 R12: 0000000000000102 R13: 0000000000000001 R14: dffffc0000000000 R15: 0000000000000206 spin_unlock_irqrestore include/linux/spinlock.h:406 [inline] avc_reclaim_node security/selinux/avc.c:482 [inline] avc_alloc_node+0x365/0x5a0 security/selinux/avc.c:501 avc_insert security/selinux/avc.c:612 [inline] avc_compute_av+0xfd/0x5c0 security/selinux/avc.c:987 avc_perm_nonode+0xaa/0x170 security/selinux/avc.c:1110 avc_has_perm_noaudit+0x2d2/0x3a0 security/selinux/avc.c:1153 selinux_inode_permission+0x361/0x590 security/selinux/hooks.c:3118 security_inode_permission+0xda/0x260 security/security.c:2319 inode_permission fs/namei.c:600 [inline] inode_permission+0x17a/0x5f0 fs/namei.c:567 may_lookup fs/namei.c:1819 [inline] link_path_walk.part.0.constprop.0+0x1d7/0xd40 fs/namei.c:2425 link_path_walk fs/namei.c:2408 [inline] path_lookupat+0x93/0x770 fs/namei.c:2633 filename_lookup+0x221/0x5f0 fs/namei.c:2663 user_path_at+0x3a/0x60 fs/namei.c:3070 ksys_umount fs/namespace.c:2033 [inline] __do_sys_umount fs/namespace.c:2041 [inline] __se_sys_umount fs/namespace.c:2039 [inline] __x64_sys_umount+0x10b/0x1a0 fs/namespace.c:2039 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f57d8b87057 Code: a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 0f 1f 44 00 00 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 a8 ff ff ff f7 d8 64 89 02 b8 RSP: 002b:00007ffe9ad44308 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 RAX: ffffffffffffffda RBX: 00007f57d8c018f4 RCX: 00007f57d8b87057 RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffe9ad45440 RBP: 00007ffe9ad4542c R08: 0000000000000000 R09: 00007f57d9a53000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffe9ad45440 R13: 00007f57d8c018f4 R14: 00007ffe9ad45480 R15: 000000000000069d task:syz-executor state:R running task stack:21936 pid:5817 tgid:5817 ppid:5808 flags:0x00004008 Call Trace: rcu: rcu_preempt kthread starved for 10286 jiffies! g292789 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:27744 pid:17 tgid:17 ppid:2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5369 [inline] __schedule+0xe58/0x5ad0 kernel/sched/core.c:6756 __schedule_loop kernel/sched/core.c:6833 [inline] schedule+0xe7/0x350 kernel/sched/core.c:6848 schedule_timeout+0x124/0x280 kernel/time/sleep_timeout.c:99 rcu_gp_fqs_loop+0x1eb/0xb00 kernel/rcu/tree.c:2045 rcu_gp_kthread+0x271/0x380 kernel/rcu/tree.c:2247 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 rcu: Stack dump where RCU GP kthread last ran: CPU: 0 UID: 0 PID: 31825 Comm: syz.2.8334 Not tainted 6.13.0-rc4-syzkaller-00110-g4099a71718b0 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 RIP: 0010:csd_lock_wait kernel/smp.c:340 [inline] RIP: 0010:smp_call_function_many_cond+0x458/0x1300 kernel/smp.c:884 Code: 0c 00 85 ed 74 4d 48 b8 00 00 00 00 00 fc ff df 4d 89 f4 4c 89 f5 49 c1 ec 03 83 e5 07 49 01 c4 83 c5 03 e8 ba 0e 0c 00 f3 90 <41> 0f b6 04 24 40 38 c5 7c 08 84 c0 0f 85 a7 0c 00 00 8b 43 08 31 RSP: 0018:ffffc9000bb97b18 EFLAGS: 00000246 RAX: 0000000000080000 RBX: ffff8880b8744a40 RCX: ffffc9000ed3d000 RDX: 0000000000080000 RSI: ffffffff818e0766 RDI: 0000000000000005 RBP: 0000000000000003 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000004 R12: ffffed10170e8949 R13: 0000000000000001 R14: ffff8880b8744a48 R15: ffff8880b863fe40 FS: 00007fbce3a776c0(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020005104 CR3: 000000007a5d4000 CR4: 00000000003526f0 Call Trace: on_each_cpu_cond_mask+0x40/0x90 kernel/smp.c:1051 on_each_cpu include/linux/smp.h:71 [inline] text_poke_sync arch/x86/kernel/alternative.c:2114 [inline] text_poke_bp_batch+0x22b/0x760 arch/x86/kernel/alternative.c:2324 text_poke_flush arch/x86/kernel/alternative.c:2515 [inline] text_poke_flush arch/x86/kernel/alternative.c:2512 [inline] text_poke_finish+0x30/0x40 arch/x86/kernel/alternative.c:2522 arch_jump_label_transform_apply+0x1c/0x30 arch/x86/kernel/jump_label.c:146 jump_label_update+0x1d7/0x400 kernel/jump_label.c:920 static_key_slow_inc_cpuslocked kernel/jump_label.c:168 [inline] static_key_slow_inc_cpuslocked+0x82/0x120 kernel/jump_label.c:151 static_key_slow_inc+0x1a/0x30 kernel/jump_label.c:191 io_uring_create io_uring/io_uring.c:3646 [inline] io_uring_setup+0x2054/0x3230 io_uring/io_uring.c:3811 __do_sys_io_uring_setup io_uring/io_uring.c:3838 [inline] __se_sys_io_uring_setup io_uring/io_uring.c:3832 [inline] __x64_sys_io_uring_setup+0x98/0x140 io_uring/io_uring.c:3832 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fbce2b85d29 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:00007fbce3a77038 EFLAGS: 00000246 ORIG_RAX: 00000000000001a9 RAX: ffffffffffffffda RBX: 00007fbce2d76080 RCX: 00007fbce2b85d29 RDX: 0000000000000000 RSI: 0000000020005100 RDI: 00000000000006f6 RBP: 00007fbce2c01b08 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fbce2d76080 R15: 00007ffc9b4913f8