====================================== | [ 8.118956][ T87] softirqs last disabled at (225537): __irq_exit_rcu (kernel/softirq.c:679 kernel/softirq.c:519 kernel/softirq.c:767) | [ 8.118959][ T87] Preemption disabled at: | [ 8.118959][ T87] vprintk_emit (kernel/printk/printk.c:2471) | [ 8.118969][ T87] Tainted: [W]=WARN [ 8.118970][ T87] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 8.118972][ T87] Call Trace: [ 8.118974][ T87] [ 8.118975][ T87] dump_stack_lvl (lib/dump_stack.c:94 lib/dump_stack.c:120) [ 8.118980][ T87] ? vprintk_emit (kernel/printk/printk.c:2471) [ 8.118982][ T87] __might_resched.cold (kernel/sched/core.c:9234) [ 8.118986][ T87] ? perf_trace_sched_switch (./include/linux/list.h:1037 (discriminator 3)) [ 8.118988][ T87] ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:753 (discriminator 3)) [ 8.118992][ T87] __kmalloc_noprof (./include/linux/sched/mm.h:322 (discriminator 2) mm/slub.c:4636 (discriminator 2) mm/slub.c:4974 (discriminator 2) mm/slub.c:5413 (discriminator 2) mm/slub.c:5439 (discriminator 2)) [ 8.118995][ T87] ? __rwlock_init (kernel/locking/spinlock_debug.c:48) [ 8.118997][ T87] ? alloc_buf.isra.0 (./include/linux/slab.h:995 drivers/char/virtio_console.c:429) [ 8.119000][ T87] ? do_raw_spin_unlock (./include/linux/instrumented.h:82 ./include/linux/atomic/atomic-instrumented.h:32 ./include/asm-generic/qspinlock.h:58 kernel/locking/spinlock_debug.c:101 kernel/locking/spinlock_debug.c:141) [ 8.119001][ T87] alloc_buf.isra.0 (./include/linux/slab.h:995 drivers/char/virtio_console.c:429) [ 8.119003][ T87] put_chars (drivers/char/virtio_console.c:1176) [ 8.119005][ T87] ? __send_to_port (drivers/char/virtio_console.c:654) [ 8.119006][ T87] ? console_prepend_replay (kernel/printk/printk.c:3005) [ 8.119008][ T87] ? desc_read (./include/linux/instrumented.h:97 ./include/linux/atomic/atomic-instrumented.h:3223 kernel/printk/printk_ringbuffer.c:552) [ 8.119011][ T87] hvc_console_print (drivers/tty/hvc/hvc_console.c:177 (discriminator 2)) [ 8.119014][ T87] ? hvc_write (drivers/tty/hvc/hvc_console.c:501) [ 8.119015][ T87] ? __rwlock_init (kernel/locking/spinlock_debug.c:48) [ 8.119016][ T87] ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:753 (discriminator 3)) [ 8.119018][ T87] ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:753 (discriminator 3)) [ 8.119020][ T87] console_emit_next_record (kernel/printk/printk.c:3183) [ 8.119022][ T87] ? devkmsg_read (./arch/x86/include/asm/atomic64_64.h:20) [ 8.119023][ T87] ? _prb_read_valid (kernel/printk/printk_ringbuffer.c:1996) [ 8.119025][ T87] ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:753 (discriminator 3)) [ 8.119027][ T87] ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:753 (discriminator 3)) [ 8.119028][ T87] ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:753 (discriminator 3)) [ 8.119029][ T87] ? lock_acquire (./include/trace/events/lock.h:23 (discriminator 22) kernel/locking/lockdep.c:5871 (discriminator 22)) [ 8.119031][ T87] ? console_flush_one_record (kernel/printk/printk.c:3247) [ 8.119032][ T87] console_flush_one_record (kernel/printk/printk.c:3268) [ 8.119034][ T87] ? console_emit_next_record (kernel/printk/printk.c:3150) [ 8.119036][ T87] console_unlock (kernel/printk/printk.c:3350 kernel/printk/printk.c:3380 kernel/printk/printk.c:3420) [ 8.119038][ T87] ? lock_acquire (./include/trace/events/lock.h:23 (discriminator 22) kernel/locking/lockdep.c:5871 (discriminator 22)) [ 8.119039][ T87] ? console_flush_one_record (kernel/printk/printk.c:3316) [ 8.119040][ T87] ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:753 (discriminator 3)) [ 8.119042][ T87] ? lock_release (./include/trace/events/lock.h:68 (discriminator 22) kernel/locking/lockdep.c:5920 (discriminator 22)) [ 8.119043][ T87] ? lock_acquire (kernel/locking/lockdep.c:5913) [ 8.119044][ T87] ? sync_exp_reset_tree_hotplug (kernel/rcu/tree_exp.h:98) [ 8.119046][ T87] ? __down_trylock_console_sem (kernel/printk/printk.c:334) [ 8.119047][ T87] ? vprintk_emit (kernel/printk/printk.c:2478) [ 8.119049][ T87] vprintk_emit (kernel/printk/printk.c:2479) [ 8.119051][ T87] ? wake_up_klogd_work_func (kernel/printk/printk.c:4603 (discriminator 126)) [ 8.119052][ T87] ? kasan_save_stack (mm/kasan/common.c:58) [ 8.119055][ T87] ? kasan_record_aux_stack (mm/kasan/generic.c:556) [ 8.119058][ T87] dev_vprintk_emit (drivers/base/core.c:5000) [ 8.119062][ T87] ? device_rename.cold (drivers/base/core.c:4612 (discriminator 13)) [ 8.119064][ T87] ? lock_release (./include/trace/events/lock.h:68 (discriminator 22) kernel/locking/lockdep.c:5920 (discriminator 22)) [ 8.119065][ T87] ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:753 (discriminator 3)) [ 8.119067][ T87] ? lock_acquire (./include/trace/events/lock.h:23 (discriminator 22) kernel/locking/lockdep.c:5871 (discriminator 22)) [ 8.119068][ T87] dev_printk_emit (drivers/base/core.c:5011) [ 8.119070][ T87] ? dev_vprintk_emit (drivers/base/core.c:5001) [ 8.119072][ T87] ? lock_release (./include/trace/events/lock.h:68 (discriminator 22) kernel/locking/lockdep.c:5920 (discriminator 22)) [ 8.119073][ T87] ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:753 (discriminator 3)) [ 8.119075][ T87] ? lock_acquire (./include/trace/events/lock.h:23 (discriminator 22) kernel/locking/lockdep.c:5871 (discriminator 22)) [ 8.119076][ T87] ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:753 (discriminator 3)) [ 8.119078][ T87] __netdev_printk (net/core/dev.c:13140 (discriminator 4)) [ 8.119080][ T87] netdev_info (net/core/dev.c:13195 (discriminator 3)) [ 8.119082][ T87] ? netdev_notice (net/core/dev.c:13194) [ 8.119083][ T87] ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:753 (discriminator 3)) [ 8.119085][ T87] ? lock_acquire (./include/trace/events/lock.h:23 (discriminator 22) kernel/locking/lockdep.c:5871 (discriminator 22)) [ 8.119086][ T87] ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:753 (discriminator 3)) [ 8.119087][ T87] ? do_raw_spin_lock (./include/linux/instrumented.h:55 ./include/linux/atomic/atomic-instrumented.h:1301 ./include/asm-generic/qspinlock.h:112 kernel/locking/spinlock_debug.c:116) [ 8.119088][ T87] ? __rwlock_init (kernel/locking/spinlock_debug.c:48) [ 8.119090][ T87] ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:753 (discriminator 3)) [ 8.119091][ T87] ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:753 (discriminator 3)) [ 8.119092][ T87] ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40 (discriminator 22)) [ 8.119095][ T87] ? trace_irq_disable.constprop.0 (./include/trace/events/preemptirq.h:36 (discriminator 22)) [ 8.119097][ T87] ? trace_irq_enable.constprop.0 (./include/linux/instrumented.h:82 ./include/asm-generic/bitops/instrumented-non-atomic.h:141 ./include/linux/cpumask.h:650 ./include/linux/cpumask.h:1232 ./include/trace/events/preemptirq.h:40) [ 8.119099][ T87] ? do_setlink.isra.0 (net/core/rtnetlink.c:3246) [ 8.119102][ T87] netif_change_name.cold (net/core/dev.c:1507 (discriminator 3)) [ 8.119105][ T87] ? netdev_adjacent_rename_links (net/core/dev.c:9598) [ 8.119108][ T87] ? __asan_memset (mm/kasan/shadow.c:84 (discriminator 1)) [ 8.119111][ T87] do_setlink.isra.0 (net/core/rtnetlink.c:3246) [ 8.119113][ T87] ? rtnl_link_get_size (net/core/rtnetlink.c:747) [ 8.119114][ T87] ? lock_acquire (./include/trace/events/lock.h:23 (discriminator 22) kernel/locking/lockdep.c:5871 (discriminator 22)) [ 8.119116][ T87] ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:753 (discriminator 3)) [ 8.119117][ T87] ? lock_release (./include/trace/events/lock.h:68 (discriminator 22) kernel/locking/lockdep.c:5920 (discriminator 22)) [ 8.119118][ T87] ? is_bpf_text_address (./include/linux/rcupdate.h:850 kernel/bpf/core.c:749) [ 8.119121][ T87] ? is_bpf_text_address (./include/linux/rcupdate.h:882 kernel/bpf/core.c:751) [ 8.119122][ T87] ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:753 (discriminator 3)) [ 8.119124][ T87] ? kernel_text_address (kernel/extable.c:125 kernel/extable.c:94) [ 8.119127][ T87] ? lock_acquire (./include/trace/events/lock.h:23 (discriminator 22) kernel/locking/lockdep.c:5871 (discriminator 22)) [ 8.119128][ T87] ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:753 (discriminator 3)) [ 8.119129][ T87] ? lock_release (./include/trace/events/lock.h:68 (discriminator 22) kernel/locking/lockdep.c:5920 (discriminator 22)) [ 8.119130][ T87] ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:753 (discriminator 3)) [ 8.119132][ T87] ? lock_acquire (./include/trace/events/lock.h:23 (discriminator 22) kernel/locking/lockdep.c:5871 (discriminator 22)) [ 8.119133][ T87] ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:753 (discriminator 3)) [ 8.119134][ T87] ? lock_release (./include/trace/events/lock.h:68 (discriminator 22) kernel/locking/lockdep.c:5920 (discriminator 22)) [ 8.119135][ T87] ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:753 (discriminator 3)) [ 8.119137][ T87] ? lock_acquire (./include/trace/events/lock.h:23 (discriminator 22) kernel/locking/lockdep.c:5871 (discriminator 22)) [ 8.119138][ T87] ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:753 (discriminator 3)) [ 8.119139][ T87] ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:753 (discriminator 3)) [ 8.119140][ T87] ? trace_contention_end (./include/trace/events/lock.h:121 (discriminator 22)) [ 8.119143][ T87] ? __mutex_lock (./include/linux/instrumented.h:82 ./include/linux/atomic/atomic-instrumented.h:3188 kernel/locking/mutex.c:89 kernel/locking/mutex.c:134 kernel/locking/mutex.c:649 kernel/locking/mutex.c:821) [ 8.119144][ T87] ? __mutex_lock (kernel/locking/mutex.c:656 (discriminator 1) kernel/locking/mutex.c:821 (discriminator 1)) [ 8.119146][ T87] ? lock_release (./include/trace/events/lock.h:68 (discriminator 22) kernel/locking/lockdep.c:5920 (discriminator 22)) [ 8.119147][ T87] ? rtnl_setlink (net/core/rtnetlink.c:80 net/core/rtnetlink.c:366 net/core/rtnetlink.c:3586) [ 8.119148][ T87] ? is_bpf_text_address (./include/linux/rcupdate.h:882 kernel/bpf/core.c:751) [ 8.119150][ T87] ? kernel_text_address (kernel/extable.c:125 kernel/extable.c:94) [ 8.119151][ T87] ? ww_mutex_lock (kernel/locking/mutex.c:934) [ 8.119153][ T87] ? nla_get_range_signed (lib/nlattr.c:270) [ 8.119157][ T87] ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:753 (discriminator 3)) [ 8.119158][ T87] ? lock_acquire (./include/trace/events/lock.h:23 (discriminator 22) kernel/locking/lockdep.c:5871 (discriminator 22)) [ 8.119160][ T87] ? cap_capable (./include/trace/events/capability.h:26 (discriminator 22) security/commoncap.c:130 (discriminator 22)) [ 8.119164][ T87] rtnl_setlink (net/core/rtnetlink.c:3596) [ 8.119166][ T87] ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:753 (discriminator 3)) [ 8.119167][ T87] ? __rtnl_newlink (net/core/rtnetlink.c:4090 (discriminator 1)) [ 8.119169][ T87] ? lock_release (./include/trace/events/lock.h:68 (discriminator 22) kernel/locking/lockdep.c:5920 (discriminator 22)) [ 8.119175][ T87] ? unwind_next_frame (./include/linux/rcupdate.h:882 ./include/linux/rcupdate.h:1216 arch/x86/kernel/unwind_orc.c:495) [ 8.119177][ T87] ? entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121) [ 8.119179][ T87] ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:753 (discriminator 3)) [ 8.119181][ T87] ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:753 (discriminator 3)) [ 8.119182][ T87] ? lock_acquire (./include/trace/events/lock.h:23 (discriminator 22) kernel/locking/lockdep.c:5871 (discriminator 22)) [ 8.119183][ T87] ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:753 (discriminator 3)) [ 8.119185][ T87] ? lock_release (./include/trace/events/lock.h:68 (discriminator 22) kernel/locking/lockdep.c:5920 (discriminator 22)) [ 8.119186][ T87] ? is_bpf_text_address (./include/linux/rcupdate.h:850 kernel/bpf/core.c:749) [ 8.119187][ T87] ? is_bpf_text_address (./include/linux/rcupdate.h:882 kernel/bpf/core.c:751) [ 8.119188][ T87] ? kernel_text_address (kernel/extable.c:125 kernel/extable.c:94) [ 8.119190][ T87] ? __kernel_text_address (kernel/extable.c:79) [ 8.119192][ T87] ? write_profile (profile.c:?) [ 8.119194][ T87] ? unwind_get_return_address (arch/x86/kernel/unwind_orc.c:385 arch/x86/kernel/unwind_orc.c:380) [ 8.119196][ T87] ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:753 (discriminator 3)) [ 8.119197][ T87] ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:753 (discriminator 3)) [ 8.119199][ T87] ? cap_capable (./include/trace/events/capability.h:26 (discriminator 22) security/commoncap.c:130 (discriminator 22)) [ 8.119200][ T87] ? lock_acquire (./include/trace/events/lock.h:23 (discriminator 22) kernel/locking/lockdep.c:5871 (discriminator 22)) [ 8.119202][ T87] ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:753 (discriminator 3)) [ 8.119203][ T87] ? __rtnl_newlink (net/core/rtnetlink.c:4090 (discriminator 1)) [ 8.119205][ T87] rtnetlink_rcv_msg (net/core/rtnetlink.c:7132) [ 8.119207][ T87] ? rtnl_link_fill (./include/net/netlink.h:1107 (discriminator 1)) [ 8.119208][ T87] ? filter_irq_stacks (kernel/stacktrace.c:402) [ 8.119210][ T87] ? stack_depot_save_flags (lib/stackdepot.c:609 lib/stackdepot.c:676) [ 8.119213][ T87] netlink_rcv_skb (net/netlink/af_netlink.c:2556) [ 8.119216][ T87] ? rtnl_link_fill (./include/net/netlink.h:1107 (discriminator 1)) [ 8.119217][ T87] ? lock_release (./include/trace/events/lock.h:68 (discriminator 22) kernel/locking/lockdep.c:5920 (discriminator 22)) [ 8.119218][ T87] ? netlink_ack (./include/linux/skbuff.h:2718) [ 8.119220][ T87] ? __netlink_lookup (./include/linux/rcupdate.h:850 ./include/linux/rhashtable.h:709 net/netlink/af_netlink.c:499) [ 8.119223][ T87] ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:753 (discriminator 3)) [ 8.119224][ T87] ? lock_release (./include/trace/events/lock.h:68 (discriminator 22) kernel/locking/lockdep.c:5920 (discriminator 22)) [ 8.119226][ T87] netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1345) [ 8.119228][ T87] ? netlink_attachskb (./arch/x86/include/asm/bitops.h:202 (discriminator 1)) [ 8.119231][ T87] netlink_sendmsg (net/netlink/af_netlink.c:1900) [ 8.119233][ T87] ? netlink_unicast (./include/net/net_namespace.h:422 (discriminator 7)) [ 8.119234][ T87] ? lock_acquire (./include/trace/events/lock.h:23 (discriminator 22) kernel/locking/lockdep.c:5871 (discriminator 22)) [ 8.119236][ T87] ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:753 (discriminator 3)) [ 8.119237][ T87] ? lock_release (./include/trace/events/lock.h:68 (discriminator 22) kernel/locking/lockdep.c:5920 (discriminator 22)) [ 8.119238][ T87] ? __might_fault (mm/memory.c:7482 (discriminator 5)) [ 8.119241][ T87] __sys_sendto (net/socket.c:800 (discriminator 4) net/socket.c:815 (discriminator 4) net/socket.c:2281 (discriminator 4)) [ 8.119244][ T87] ? __ia32_sys_getpeername (net/socket.c:2235) [ 8.119248][ T87] __x64_sys_sendto (net/socket.c:2288 net/socket.c:2284 net/socket.c:2284) [ 8.119249][ T87] ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40 (discriminator 22)) [ 8.119251][ T87] ? trace_hardirqs_off_finish (./include/trace/events/preemptirq.h:36 (discriminator 22) kernel/trace/trace_preemptirq.c:95 (discriminator 22) kernel/trace/trace_preemptirq.c:90 (discriminator 22)) [ 8.119252][ T87] ? trace_hardirqs_on (kernel/trace/trace_preemptirq.c:78) [ 8.119254][ T87] do_syscall_64 (arch/x86/entry/syscall_64.c:61 arch/x86/entry/syscall_64.c:84) [ 8.119258][ T87] ? exc_page_fault (arch/x86/mm/fault.c:1489 (discriminator 3) arch/x86/mm/fault.c:1536 (discriminator 3)) [ 8.119261][ T87] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121) [ 8.119262][ T87] RIP: 0033:0x7ff1b289354e [ 8.119265][ T87] Code: 4d 89 d8 e8 b4 bd 00 00 4c 8b 5d f8 41 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 11 c9 c3 0f 1f 80 00 00 00 00 48 8b 45 10 0f 05 c3 83 e2 39 83 fa 08 75 e7 e8 03 ff ff ff 0f 1f 00 f3 0f 1e fa All code ======== 0: 4d 89 d8 mov %r11,%r8 3: e8 b4 bd 00 00 call 0xbdbc 8: 4c 8b 5d f8 mov -0x8(%rbp),%r11 c: 41 8b 93 08 03 00 00 mov 0x308(%r11),%edx 13: 59 pop %rcx 14: 5e pop %rsi 15: 48 83 f8 fc cmp $0xfffffffffffffffc,%rax 19: 74 11 je 0x2c 1b: c9 leave 1c: c3 ret 1d: 0f 1f 80 00 00 00 00 nopl 0x0(%rax) 24: 48 8b 45 10 mov 0x10(%rbp),%rax 28: 0f 05 syscall 2a:* c9 leave <-- trapping instruction 2b: c3 ret 2c: 83 e2 39 and $0x39,%edx 2f: 83 fa 08 cmp $0x8,%edx 32: 75 e7 jne 0x1b 34: e8 03 ff ff ff call 0xffffffffffffff3c 39: 0f 1f 00 nopl (%rax) 3c: f3 0f 1e fa endbr64 Code starting with the faulting instruction =========================================== 0: c9 leave 1: c3 ret 2: 83 e2 39 and $0x39,%edx 5: 83 fa 08 cmp $0x8,%edx 8: 75 e7 jne 0xfffffffffffffff1 a: e8 03 ff ff ff call 0xffffffffffffff12 f: 0f 1f 00 nopl (%rax) 12: f3 0f 1e fa endbr64 [ 8.119267][ T87] RSP: 002b:00007ffc20ab2d50 EFLAGS: 00000202 ORIG_RAX: 000000000000002c [ 8.119271][ T87] RAX: ffffffffffffffda RBX: 000055b2d5683f80 RCX: 00007ff1b289354e [ 8.119272][ T87] RDX: 0000000000000030 RSI: 000055b2d567fa00 RDI: 000000000000001c [ 8.119273][ T87] RBP: 00007ffc20ab2d60 R08: 00007ffc20ab2db0 R09: 0000000000000080 [ 8.119273][ T87] R10: 0000000000000000 R11: 0000000000000202 R12: 000055b2d57d90d0 Finger prints: __irq_exit_rcu:vprintk_emit:dump_stack_lvl:__kmalloc_noprof:put_chars