rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 0-...!: (0 ticks this GP) idle=22c4/1/0x4000000000000000 softirq=23339/23339 fqs=0 rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P4075/1:b..l P8230/1:b..l (detected by 1, t=10506 jiffies, g=36581, q=52 ncpus=2) Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 8225 Comm: syz-executor.3 Not tainted 6.0.0-rc1-syzkaller-00066-g3b06a2755758 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022 RIP: 0010:hlock_class kernel/locking/lockdep.c:231 [inline] RIP: 0010:hlock_class kernel/locking/lockdep.c:220 [inline] RIP: 0010:check_wait_context kernel/locking/lockdep.c:4752 [inline] RIP: 0010:__lock_acquire+0x63b/0x56d0 kernel/locking/lockdep.c:5003 Code: 48 c7 c0 e8 23 de 8d 4c 89 64 24 50 45 89 f4 49 bf 00 00 00 00 00 fc ff df 48 c1 e8 03 4c 8b 74 24 28 4c 01 f8 48 89 44 24 58 66 48 8d 04 5b 48 c1 e0 06 48 05 60 ad 8d 90 48 8d b8 b8 00 00 RSP: 0018:ffffc90000007ab8 EFLAGS: 00000086 RAX: fffffbfff1bbc47d RBX: ffff88802f252b08 RCX: 0000000000000001 RDX: 0000000000000001 RSI: 0000000000000040 RDI: ffffffff908dae19 RBP: 0000000000000002 R08: 0000000000000000 R09: dffffc0000000000 R10: fffffbfff211b528 R11: 0000000000000000 R12: 0000000000000003 R13: ffff88802f252040 R14: ffff88802f252ab8 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f119cc76718 CR3: 000000007ca9f000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lock_acquire kernel/locking/lockdep.c:5666 [inline] lock_acquire+0x1ab/0x570 kernel/locking/lockdep.c:5631 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x39/0x50 kernel/locking/spinlock.c:162 debug_object_activate+0x12e/0x3e0 lib/debugobjects.c:658 debug_hrtimer_activate kernel/time/hrtimer.c:420 [inline] debug_activate kernel/time/hrtimer.c:475 [inline] enqueue_hrtimer+0x27/0x3e0 kernel/time/hrtimer.c:1084 __run_hrtimer kernel/time/hrtimer.c:1702 [inline] __hrtimer_run_queues+0xaf3/0xe40 kernel/time/hrtimer.c:1749 hrtimer_interrupt+0x31c/0x790 kernel/time/hrtimer.c:1811 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1095 [inline] __sysvec_apic_timer_interrupt+0x146/0x530 arch/x86/kernel/apic/apic.c:1112 sysvec_apic_timer_interrupt+0x8e/0xc0 arch/x86/kernel/apic/apic.c:1106 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:649 RIP: 0010:crc32c_intel_le_hw arch/x86/crypto/crc32c-intel_glue.c:68 [inline] RIP: 0010:crc32c_pcl_intel_update+0xee/0x320 arch/x86/crypto/crc32c-intel_glue.c:165 Code: 00 0f 85 01 02 00 00 31 ff 44 89 e6 48 83 c5 08 f2 48 0f 38 f1 5d f8 e8 f0 86 36 00 45 8d 74 24 ff 45 85 e4 75 c7 8b 44 24 10 <83> c0 01 4d 8d 6c c5 00 e8 15 8a 36 00 44 8b 7c 24 14 31 ff 44 89 RSP: 0018:ffffc90003ef7948 EFLAGS: 00000246 RAX: 0000000000000002 RBX: 00000000026b330d RCX: ffffffff8144afd0 RDX: ffff88802f252040 RSI: 0000000000000000 RDI: 0000000000000005 RBP: ffff88814b165018 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000000 R11: ffff88807ffe13f0 R12: 0000000000000000 R13: ffff88814b165000 R14: 00000000ffffffff R15: dffffc0000000000 crypto_shash_update+0xc4/0x120 crypto/shash.c:131 ext4_chksum fs/ext4/ext4.h:2465 [inline] ext4_group_desc_csum+0x2fe/0x820 fs/ext4/super.c:3197 ext4_group_desc_csum_set+0xc3/0x190 fs/ext4/super.c:3243 ext4_free_inode+0x95e/0x13f0 fs/ext4/ialloc.c:332 ext4_evict_inode+0xfbc/0x1d40 fs/ext4/inode.c:331 evict+0x2ed/0x6b0 fs/inode.c:665 iput_final fs/inode.c:1748 [inline] iput.part.0+0x55d/0x810 fs/inode.c:1774 iput+0x58/0x70 fs/inode.c:1764 dentry_unlink_inode+0x2b1/0x460 fs/dcache.c:401 __dentry_kill+0x3c0/0x640 fs/dcache.c:607 dentry_kill fs/dcache.c:745 [inline] dput+0x64d/0xdb0 fs/dcache.c:913 path_put+0x2d/0x60 fs/namei.c:558 free_fs_struct fs/fs_struct.c:91 [inline] exit_fs+0xf9/0x170 fs/fs_struct.c:108 do_exit+0xaa6/0x29b0 kernel/exit.c:791 __do_sys_exit kernel/exit.c:892 [inline] __se_sys_exit kernel/exit.c:890 [inline] __x64_sys_exit+0x3e/0x50 kernel/exit.c:890 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7fbfa4689279 Code: Unable to access opcode bytes at RIP 0x7fbfa468924f. RSP: 002b:00007fbfa35fe118 EFLAGS: 00000246 ORIG_RAX: 000000000000003c RAX: ffffffffffffffda RBX: 00007fbfa479bf80 RCX: 00007fbfa4689279 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00007fbfa46e3189 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffcd6cb0c6f R14: 00007fbfa35fe300 R15: 0000000000022000 task:syz-executor.0 state:R running task stack:28688 pid: 8230 ppid: 3641 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5182 [inline] __schedule+0xadf/0x52b0 kernel/sched/core.c:6494 preempt_schedule_irq+0x4e/0x90 kernel/sched/core.c:6806 irqentry_exit+0x31/0x80 kernel/entry/common.c:428 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:649 RIP: 0010:lock_acquire+0x1ef/0x570 kernel/locking/lockdep.c:5634 Code: ce a3 7e 83 f8 01 0f 85 e8 02 00 00 9c 58 f6 c4 02 0f 85 fb 02 00 00 48 83 7c 24 08 00 74 01 fb 48 b8 00 00 00 00 00 fc ff df <48> 01 c3 48 c7 03 00 00 00 00 48 c7 43 08 00 00 00 00 48 8b 84 24 RSP: 0000:ffffc900032a7be0 EFLAGS: 00000206 RAX: dffffc0000000000 RBX: 1ffff92000654f7e RCX: 29dbb717f440da5e RDX: 1ffff11005a5816e RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff908da947 R10: fffffbfff211b528 R11: 0000000000000000 R12: 0000000000000002 R13: 0000000000000000 R14: ffffffff8bf867c0 R15: 0000000000000000 rcu_lock_acquire include/linux/rcupdate.h:280 [inline] rcu_read_lock include/linux/rcupdate.h:706 [inline] percpu_ref_put_many.constprop.0+0x2c/0x1a0 include/linux/percpu-refcount.h:330 percpu_ref_put include/linux/percpu-refcount.h:351 [inline] css_put include/linux/cgroup.h:404 [inline] __mem_cgroup_charge+0x6d/0x90 mm/memcontrol.c:6810 mem_cgroup_charge include/linux/memcontrol.h:689 [inline] do_anonymous_page mm/memory.c:4088 [inline] handle_pte_fault mm/memory.c:4909 [inline] __handle_mm_fault+0x17df/0x39b0 mm/memory.c:5053 handle_mm_fault+0x1c8/0x780 mm/memory.c:5151 do_user_addr_fault+0x475/0x1210 arch/x86/mm/fault.c:1397 handle_page_fault arch/x86/mm/fault.c:1488 [inline] exc_page_fault+0x94/0x170 arch/x86/mm/fault.c:1544 asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:570 RIP: 0033:0x7f119ba3980f RSP: 002b:00007ffed1492550 EFLAGS: 00010246 RAX: 00007f119cc56000 RBX: 0000000000021000 RCX: 00007f119ba89387 RDX: 0000000000000003 RSI: 0000000000020000 RDI: 00007f119cc57000 RBP: 00007ffed1492620 R08: 00000000ffffffff R09: 00007f119cc76700 R10: 0000000000020022 R11: 0000000000000206 R12: 00007ffed1492740 R13: 00007f119cc76700 R14: 0000000000000000 R15: 0000000000022000 task:kworker/u4:5 state:R running task stack:25936 pid: 4075 ppid: 2 flags:0x00004000 Workqueue: bat_events batadv_iv_send_outstanding_bat_ogm_packet Call Trace: context_switch kernel/sched/core.c:5182 [inline] __schedule+0xadf/0x52b0 kernel/sched/core.c:6494 preempt_schedule_irq+0x4e/0x90 kernel/sched/core.c:6806 irqentry_exit+0x31/0x80 kernel/entry/common.c:428 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:649 RIP: 0010:lock_acquire+0x1ef/0x570 kernel/locking/lockdep.c:5634 Code: ce a3 7e 83 f8 01 0f 85 e8 02 00 00 9c 58 f6 c4 02 0f 85 fb 02 00 00 48 83 7c 24 08 00 74 01 fb 48 b8 00 00 00 00 00 fc ff df <48> 01 c3 48 c7 03 00 00 00 00 48 c7 43 08 00 00 00 00 48 8b 84 24 RSP: 0018:ffffc900040efaa0 EFLAGS: 00000206 RAX: dffffc0000000000 RBX: 1ffff9200081df56 RCX: 24818582123658be RDX: 1ffff1100622f576 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff908da947 R10: fffffbfff211b528 R11: 000000000008c07c R12: 0000000000000002 R13: 0000000000000000 R14: ffffffff8bf867c0 R15: 0000000000000000 rcu_lock_acquire include/linux/rcupdate.h:280 [inline] rcu_read_lock include/linux/rcupdate.h:706 [inline] batadv_iv_ogm_slide_own_bcast_window net/batman-adv/bat_iv_ogm.c:755 [inline] batadv_iv_ogm_schedule_buff+0x5d2/0x1430 net/batman-adv/bat_iv_ogm.c:826 batadv_iv_ogm_schedule net/batman-adv/bat_iv_ogm.c:869 [inline] batadv_iv_ogm_schedule net/batman-adv/bat_iv_ogm.c:862 [inline] batadv_iv_send_outstanding_bat_ogm_packet+0x740/0x910 net/batman-adv/bat_iv_ogm.c:1713 process_one_work+0x991/0x1610 kernel/workqueue.c:2289 worker_thread+0x665/0x1080 kernel/workqueue.c:2436 kthread+0x2e4/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 rcu: rcu_preempt kthread starved for 10506 jiffies! g36581 f0x0 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:28928 pid: 16 ppid: 2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5182 [inline] __schedule+0xadf/0x52b0 kernel/sched/core.c:6494 schedule+0xda/0x1b0 kernel/sched/core.c:6570 schedule_timeout+0x14a/0x2a0 kernel/time/timer.c:1935 rcu_gp_fqs_loop+0x190/0x910 kernel/rcu/tree.c:1657 rcu_gp_kthread+0x236/0x360 kernel/rcu/tree.c:1854 kthread+0x2e4/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 rcu: Stack dump where RCU GP kthread last ran: NMI backtrace for cpu 1 CPU: 1 PID: 8232 Comm: syz-executor.3 Not tainted 6.0.0-rc1-syzkaller-00066-g3b06a2755758 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 nmi_cpu_backtrace.cold+0x46/0x14f lib/nmi_backtrace.c:111 nmi_trigger_cpumask_backtrace+0x206/0x250 lib/nmi_backtrace.c:62 trigger_single_cpu_backtrace include/linux/nmi.h:166 [inline] rcu_check_gp_kthread_starvation.cold+0x1fb/0x200 kernel/rcu/tree_stall.h:514 print_other_cpu_stall kernel/rcu/tree_stall.h:619 [inline] check_cpu_stall kernel/rcu/tree_stall.h:762 [inline] rcu_pending kernel/rcu/tree.c:3660 [inline] rcu_sched_clock_irq+0x2404/0x2530 kernel/rcu/tree.c:2342 update_process_times+0x11a/0x1a0 kernel/time/timer.c:1839 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:243 tick_sched_timer+0xee/0x120 kernel/time/tick-sched.c:1480 __run_hrtimer kernel/time/hrtimer.c:1685 [inline] __hrtimer_run_queues+0x1c0/0xe40 kernel/time/hrtimer.c:1749 hrtimer_interrupt+0x31c/0x790 kernel/time/hrtimer.c:1811 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1095 [inline] __sysvec_apic_timer_interrupt+0x146/0x530 arch/x86/kernel/apic/apic.c:1112 sysvec_apic_timer_interrupt+0x8e/0xc0 arch/x86/kernel/apic/apic.c:1106 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:649 RIP: 0010:kvm_wait+0x98/0x100 arch/x86/kernel/kvm.c:1070 Code: fa 83 e2 07 38 d0 7f 04 84 c0 75 63 0f b6 07 40 38 c6 74 35 48 83 c4 10 c3 c3 e8 83 2c 4c 00 66 90 0f 00 2d 7a 44 b4 08 fb f4 <48> 83 c4 10 c3 89 74 24 0c 48 89 3c 24 e8 56 2b 4c 00 8b 74 24 0c RSP: 0018:ffffc90003fb7958 EFLAGS: 00000246 RAX: 000000000000aa11 RBX: 0000000000000000 RCX: 1ffffffff21229f6 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffff88814b164000 R08: 0000000000000001 R09: ffffffff908da9df R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000000 R13: ffffed102962c800 R14: 0000000000000001 R15: ffff8880b9b3ae40 pv_wait arch/x86/include/asm/paravirt.h:603 [inline] pv_wait_head_or_lock kernel/locking/qspinlock_paravirt.h:470 [inline] __pv_queued_spin_lock_slowpath+0x8c7/0xb50 kernel/locking/qspinlock.c:511 pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:591 [inline] queued_spin_lock_slowpath arch/x86/include/asm/qspinlock.h:51 [inline] queued_spin_lock include/asm-generic/qspinlock.h:114 [inline] do_raw_spin_lock+0x200/0x2a0 kernel/locking/spinlock_debug.c:115 spin_lock include/linux/spinlock.h:349 [inline] ext4_lock_group fs/ext4/ext4.h:3491 [inline] __ext4_new_inode+0x2af2/0x5690 fs/ext4/ialloc.c:1096 ext4_symlink+0x5a8/0xa00 fs/ext4/namei.c:3356 vfs_symlink fs/namei.c:4378 [inline] vfs_symlink+0x365/0x5b0 fs/namei.c:4363 do_symlinkat+0x261/0x2e0 fs/namei.c:4407 __do_sys_symlinkat fs/namei.c:4424 [inline] __se_sys_symlinkat fs/namei.c:4421 [inline] __x64_sys_symlinkat+0x93/0xc0 fs/namei.c:4421 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7fbfa4688b87 ================================ WARNING: inconsistent lock state 6.0.0-rc1-syzkaller-00066-g3b06a2755758 #0 Not tainted -------------------------------- inconsistent {HARDIRQ-ON-W} -> {IN-HARDIRQ-W} usage. syz-executor.3/8232 [HC1[1]:SC0[0]:HE0:SE1] takes: ffffffff8c0b9258 (vmap_area_lock){?.+.}-{2:2}, at: spin_lock include/linux/spinlock.h:349 [inline] ffffffff8c0b9258 (vmap_area_lock){?.+.}-{2:2}, at: find_vmap_area+0x1c/0x130 mm/vmalloc.c:1836 {HARDIRQ-ON-W} state was registered at: lock_acquire kernel/locking/lockdep.c:5666 [inline] lock_acquire+0x1ab/0x570 kernel/locking/lockdep.c:5631 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:154 spin_lock include/linux/spinlock.h:349 [inline] alloc_vmap_area+0xa0b/0x1d50 mm/vmalloc.c:1617 __get_vm_area_node+0x142/0x3f0 mm/vmalloc.c:2484 __vmalloc_node_range+0x250/0x13a0 mm/vmalloc.c:3156 __vmalloc_node mm/vmalloc.c:3261 [inline] __vmalloc+0x69/0x80 mm/vmalloc.c:3275 pcpu_mem_zalloc mm/percpu.c:516 [inline] pcpu_mem_zalloc+0x51/0xa0 mm/percpu.c:508 pcpu_alloc_chunk mm/percpu.c:1454 [inline] pcpu_create_chunk+0xd7/0x930 mm/percpu-vm.c:338 pcpu_alloc+0x1118/0x14f0 mm/percpu.c:1834 alloc_kmem_cache_cpus.constprop.0+0x29/0x120 mm/slab.c:1729 do_tune_cpucache+0x37/0x2a0 mm/slab.c:3834 enable_cpucache+0x3c/0xa0 mm/slab.c:3928 kmem_cache_init_late+0x33/0x66 mm/slab.c:1276 start_kernel+0x2f5/0x48f init/main.c:1059 secondary_startup_64_no_verify+0xce/0xdb irq event stamp: 43538 hardirqs last enabled at (43537): [] kvm_wait arch/x86/kernel/kvm.c:1066 [inline] hardirqs last enabled at (43537): [] kvm_wait+0x8d/0x100 arch/x86/kernel/kvm.c:1048 hardirqs last disabled at (43538): [] sysvec_apic_timer_interrupt+0xb/0xc0 arch/x86/kernel/apic/apic.c:1106 softirqs last enabled at (1978): [] invoke_softirq kernel/softirq.c:445 [inline] softirqs last enabled at (1978): [] __irq_exit_rcu+0x123/0x180 kernel/softirq.c:650 softirqs last disabled at (1893): [] invoke_softirq kernel/softirq.c:445 [inline] softirqs last disabled at (1893): [] __irq_exit_rcu+0x123/0x180 kernel/softirq.c:650 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(vmap_area_lock); lock(vmap_area_lock); *** DEADLOCK *** 4 locks held by syz-executor.3/8232: #0: ffff88807f438460 (sb_writers#5){.+.+}-{0:0}, at: filename_create+0xf1/0x4a0 fs/namei.c:3777 #1: ffff8880364bb5c0 (&type->i_mutex_dir_key#3/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:791 [inline] #1: ffff8880364bb5c0 (&type->i_mutex_dir_key#3/1){+.+.}-{3:3}, at: filename_create+0x1aa/0x4a0 fs/namei.c:3784 #2: ffff88807f43c990 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0xfb4/0x14a0 fs/jbd2/transaction.c:461 #3: ffff88814b164018 (&bgl->locks[i].lock){+.+.}-{2:2}, at: spin_lock include/linux/spinlock.h:349 [inline] #3: ffff88814b164018 (&bgl->locks[i].lock){+.+.}-{2:2}, at: ext4_lock_group fs/ext4/ext4.h:3491 [inline] #3: ffff88814b164018 (&bgl->locks[i].lock){+.+.}-{2:2}, at: __ext4_new_inode+0x2af2/0x5690 fs/ext4/ialloc.c:1096 stack backtrace: CPU: 1 PID: 8232 Comm: syz-executor.3 Not tainted 6.0.0-rc1-syzkaller-00066-g3b06a2755758 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 print_usage_bug kernel/locking/lockdep.c:3961 [inline] valid_state kernel/locking/lockdep.c:3973 [inline] mark_lock_irq kernel/locking/lockdep.c:4176 [inline] mark_lock.part.0.cold+0x18/0xd8 kernel/locking/lockdep.c:4632 mark_lock kernel/locking/lockdep.c:4596 [inline] mark_usage kernel/locking/lockdep.c:4524 [inline] __lock_acquire+0x14a2/0x56d0 kernel/locking/lockdep.c:5007 lock_acquire kernel/locking/lockdep.c:5666 [inline] lock_acquire+0x1ab/0x570 kernel/locking/lockdep.c:5631 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:154 spin_lock include/linux/spinlock.h:349 [inline] find_vmap_area+0x1c/0x130 mm/vmalloc.c:1836 check_heap_object mm/usercopy.c:176 [inline] __check_object_size mm/usercopy.c:250 [inline] __check_object_size+0x1f8/0x700 mm/usercopy.c:212 check_object_size include/linux/thread_info.h:199 [inline] __copy_from_user_inatomic include/linux/uaccess.h:62 [inline] copy_from_user_nmi arch/x86/lib/usercopy.c:47 [inline] copy_from_user_nmi+0xcb/0x130 arch/x86/lib/usercopy.c:31 copy_code arch/x86/kernel/dumpstack.c:91 [inline] show_opcodes+0x59/0xb0 arch/x86/kernel/dumpstack.c:121 show_iret_regs+0xd/0x33 arch/x86/kernel/dumpstack.c:149 __show_regs+0x1e/0x60 arch/x86/kernel/process_64.c:74 show_trace_log_lvl+0x25b/0x2ba arch/x86/kernel/dumpstack.c:292 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 nmi_cpu_backtrace.cold+0x46/0x14f lib/nmi_backtrace.c:111 nmi_trigger_cpumask_backtrace+0x206/0x250 lib/nmi_backtrace.c:62 trigger_single_cpu_backtrace include/linux/nmi.h:166 [inline] rcu_check_gp_kthread_starvation.cold+0x1fb/0x200 kernel/rcu/tree_stall.h:514 print_other_cpu_stall kernel/rcu/tree_stall.h:619 [inline] check_cpu_stall kernel/rcu/tree_stall.h:762 [inline] rcu_pending kernel/rcu/tree.c:3660 [inline] rcu_sched_clock_irq+0x2404/0x2530 kernel/rcu/tree.c:2342 update_process_times+0x11a/0x1a0 kernel/time/timer.c:1839 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:243 tick_sched_timer+0xee/0x120 kernel/time/tick-sched.c:1480 __run_hrtimer kernel/time/hrtimer.c:1685 [inline] __hrtimer_run_queues+0x1c0/0xe40 kernel/time/hrtimer.c:1749 hrtimer_interrupt+0x31c/0x790 kernel/time/hrtimer.c:1811 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1095 [inline] __sysvec_apic_timer_interrupt+0x146/0x530 arch/x86/kernel/apic/apic.c:1112 sysvec_apic_timer_interrupt+0x8e/0xc0 arch/x86/kernel/apic/apic.c:1106 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:649 RIP: 0010:kvm_wait+0x98/0x100 arch/x86/kernel/kvm.c:1070 Code: fa 83 e2 07 38 d0 7f 04 84 c0 75 63 0f b6 07 40 38 c6 74 35 48 83 c4 10 c3 c3 e8 83 2c 4c 00 66 90 0f 00 2d 7a 44 b4 08 fb f4 <48> 83 c4 10 c3 89 74 24 0c 48 89 3c 24 e8 56 2b 4c 00 8b 74 24 0c RSP: 0018:ffffc90003fb7958 EFLAGS: 00000246 RAX: 000000000000aa11 RBX: 0000000000000000 RCX: 1ffffffff21229f6 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffff88814b164000 R08: 0000000000000001 R09: ffffffff908da9df R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000000 R13: ffffed102962c800 R14: 0000000000000001 R15: ffff8880b9b3ae40 pv_wait arch/x86/include/asm/paravirt.h:603 [inline] pv_wait_head_or_lock kernel/locking/qspinlock_paravirt.h:470 [inline] __pv_queued_spin_lock_slowpath+0x8c7/0xb50 kernel/locking/qspinlock.c:511 pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:591 [inline] queued_spin_lock_slowpath arch/x86/include/asm/qspinlock.h:51 [inline] queued_spin_lock include/asm-generic/qspinlock.h:114 [inline] do_raw_spin_lock+0x200/0x2a0 kernel/locking/spinlock_debug.c:115 spin_lock include/linux/spinlock.h:349 [inline] ext4_lock_group fs/ext4/ext4.h:3491 [inline] __ext4_new_inode+0x2af2/0x5690 fs/ext4/ialloc.c:1096 ext4_symlink+0x5a8/0xa00 fs/ext4/namei.c:3356 vfs_symlink fs/namei.c:4378 [inline] vfs_symlink+0x365/0x5b0 fs/namei.c:4363 do_symlinkat+0x261/0x2e0 fs/namei.c:4407 __do_sys_symlinkat fs/namei.c:4424 [inline] __se_sys_symlinkat fs/namei.c:4421 [inline] __x64_sys_symlinkat+0x93/0xc0 fs/namei.c:4421 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7fbfa4688b87 Code: 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 0a 01 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffcd6cb0ec8 EFLAGS: 00000202 ORIG_RAX: 000000000000010a RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fbfa4688b87 RDX: 00007fbfa46e323e RSI: 00000000ffffff9c RDI: 00007ffcd6cb0f90 RBP: 0000000000000001 R08: 0000000000000000 R09: 00007ffcd6cb0d60 R10: 00007ffcd6cb0c17 R11: 0000000000000202 R12: 0000000000000001 R13: 0000000000000000 R14: 0000000000000001 R15: 00007ffcd6cb0f90 Code: 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 0a 01 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffcd6cb0ec8 EFLAGS: 00000202 ORIG_RAX: 000000000000010a RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fbfa4688b87 RDX: 00007fbfa46e323e RSI: 00000000ffffff9c RDI: 00007ffcd6cb0f90 RBP: 0000000000000001 R08: 0000000000000000 R09: 00007ffcd6cb0d60 R10: 00007ffcd6cb0c17 R11: 0000000000000202 R12: 0000000000000001 R13: 0000000000000000 R14: 0000000000000001 R15: 00007ffcd6cb0f90