====================================== | [ 9.012695][ T192] softirqs last disabled at (36290): __alloc_skb (./include/linux/bottom_half.h:20 (discriminator 2) net/core/skbuff.c:697 (discriminator 2)) | [ 9.012697][ T192] Preemption disabled at: | [ 9.012698][ T192] vprintk_emit (kernel/printk/printk.c:2471) | [ 9.012706][ T192] Tainted: [W]=WARN [ 9.012707][ T192] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 9.012708][ T192] Call Trace: [ 9.012710][ T192] [ 9.012711][ T192] dump_stack_lvl (lib/dump_stack.c:94 lib/dump_stack.c:120) [ 9.012718][ T192] ? vprintk_emit (kernel/printk/printk.c:2471) [ 9.012719][ T192] __might_resched.cold (kernel/sched/core.c:9234) [ 9.012723][ T192] ? perf_trace_sched_switch (./include/linux/list.h:1037 (discriminator 3)) [ 9.012727][ T192] ? __kmalloc_noprof (./include/linux/sched/mm.h:317 mm/slub.c:4636 mm/slub.c:4974 mm/slub.c:5413 mm/slub.c:5439) [ 9.012732][ T192] __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)) [ 9.012733][ T192] ? alloc_buf.isra.0 (./include/linux/slab.h:995 drivers/char/virtio_console.c:429) [ 9.012740][ T192] ? 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) [ 9.012742][ T192] alloc_buf.isra.0 (./include/linux/slab.h:995 drivers/char/virtio_console.c:429) [ 9.012746][ T192] put_chars (drivers/char/virtio_console.c:1176) [ 9.012748][ T192] ? __send_to_port (drivers/char/virtio_console.c:654) [ 9.012751][ T192] ? validate_chain (kernel/locking/lockdep.c:3817 (discriminator 2) kernel/locking/lockdep.c:3837 (discriminator 2) kernel/locking/lockdep.c:3892 (discriminator 2)) [ 9.012756][ T192] hvc_console_print (drivers/tty/hvc/hvc_console.c:177 (discriminator 2)) [ 9.012763][ T192] ? hvc_write (drivers/tty/hvc/hvc_console.c:501) [ 9.012766][ T192] ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:753 (discriminator 3)) [ 9.012769][ T192] ? lock_acquire (./include/trace/events/lock.h:23 (discriminator 22) kernel/locking/lockdep.c:5871 (discriminator 22)) [ 9.012772][ T192] console_emit_next_record (kernel/printk/printk.c:3183) [ 9.012776][ T192] ? devkmsg_read (./arch/x86/include/asm/atomic64_64.h:20) [ 9.012778][ T192] ? console_flush_one_record (./include/linux/rcupdate.h:314 (discriminator 2) ./include/linux/srcu.h:439 (discriminator 2) kernel/printk/printk.c:291 (discriminator 2) kernel/printk/printk.c:3246 (discriminator 2)) [ 9.012781][ T192] ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:753 (discriminator 3)) [ 9.012783][ T192] ? lock_acquire (./include/trace/events/lock.h:23 (discriminator 22) kernel/locking/lockdep.c:5871 (discriminator 22)) [ 9.012787][ T192] console_flush_one_record (kernel/printk/printk.c:3268) [ 9.012791][ T192] ? console_emit_next_record (kernel/printk/printk.c:3150) [ 9.012792][ T192] ? __lock_acquire (kernel/locking/lockdep.c:5254) [ 9.012798][ T192] console_unlock (kernel/printk/printk.c:3350 kernel/printk/printk.c:3380 kernel/printk/printk.c:3420) [ 9.012800][ T192] ? console_flush_one_record (kernel/printk/printk.c:3316) [ 9.012802][ T192] ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:753 (discriminator 3)) [ 9.012804][ T192] ? lock_acquire (./include/linux/srcutree.h:374 ./include/linux/srcu.h:541 ./include/linux/srcu.h:645 ./include/trace/events/lock.h:23 ./include/trace/events/lock.h:23 kernel/locking/lockdep.c:5871) [ 9.012807][ T192] ? __down_trylock_console_sem (kernel/printk/printk.c:334) [ 9.012809][ T192] ? vprintk_emit (kernel/printk/printk.c:2478) [ 9.012812][ T192] vprintk_emit (kernel/printk/printk.c:2479) [ 9.012815][ T192] ? wake_up_klogd_work_func (kernel/printk/printk.c:4603 (discriminator 126)) [ 9.012816][ T192] ? __queue_work (./include/linux/rcupdate.h:319 (discriminator 2) ./include/linux/rcupdate.h:880 (discriminator 2) kernel/workqueue.c:2459 (discriminator 2)) [ 9.012820][ T192] ? __queue_work (./include/linux/rcupdate.h:882 kernel/workqueue.c:2459) [ 9.012824][ T192] _printk (kernel/printk/printk.c:2504) [ 9.012828][ T192] ? snapshot_read.cold (user.c:?) [ 9.012830][ T192] ? kasan_quarantine_put (mm/kasan/quarantine.c:234 (discriminator 6)) [ 9.012834][ T192] ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:753 (discriminator 3)) [ 9.012837][ T192] ? queue_work_on (kernel/workqueue.c:2505 (discriminator 6)) [ 9.012840][ T192] test_bpf (lib/test_bpf.c:267) test_bpf [ 9.012847][ T192] ? prepare_tail_call_tests.constprop.0 (lib/test_bpf.c:286) test_bpf [ 9.012854][ T192] ? test_bpf (lib/test_bpf.c:259) test_bpf [ 9.012857][ T192] test_bpf_init (lib/test_bpf.c:231) test_bpf [ 9.012861][ T192] ? test_bpf (lib/test_bpf.c:259) test_bpf [ 9.012867][ T192] ? test_bpf (lib/test_bpf.c:259) test_bpf [ 9.012870][ T192] do_one_initcall (init/main.c:1357) [ 9.012873][ T192] ? trace_event_raw_event_initcall_level (./include/trace/events/initcall.h:10) [ 9.012877][ T192] ? do_init_module (./include/linux/slab.h:991 (discriminator 1) kernel/module/main.c:3105 (discriminator 1)) [ 9.012880][ T192] ? kasan_unpoison (mm/kasan/shadow.c:146 mm/kasan/shadow.c:178) [ 9.012884][ T192] do_init_module (kernel/module/main.c:3117) [ 9.012887][ T192] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4488) [ 9.012890][ T192] ? free_module (./include/trace/events/module.h:50 (discriminator 19)) [ 9.012893][ T192] ? kfree (./include/linux/kasan.h:235 mm/slub.c:2748 mm/slub.c:6499 mm/slub.c:6792) [ 9.012897][ T192] load_module (kernel/module/main.c:3593) [ 9.012902][ T192] ? security_kernel_post_read_file (security/security.c:2997 (discriminator 11)) [ 9.012906][ T192] ? layout_and_allocate.isra.0 (kernel/module/main.c:3016) [ 9.012909][ T192] ? __ia32_sys_fsconfig (??:?) [ 9.012912][ T192] ? add_chain_cache (kernel/locking/lockdep.c:3782) [ 9.012917][ T192] init_module_from_file (kernel/module/main.c:3790) [ 9.012920][ T192] ? __do_sys_init_module (kernel/module/main.c:3664) [ 9.012931][ T192] ? __rwlock_init (kernel/locking/spinlock_debug.c:48) [ 9.012934][ T192] ? 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) [ 9.012937][ T192] idempotent_init_module (kernel/module/main.c:3802) [ 9.012940][ T192] ? init_module_from_file (kernel/module/main.c:3791) [ 9.012945][ T192] ? cap_capable (./include/trace/events/capability.h:26 (discriminator 22) security/commoncap.c:130 (discriminator 22)) [ 9.012948][ T192] ? __x64_sys_pread64 (fs/read_write.c:764 fs/read_write.c:772 fs/read_write.c:769 fs/read_write.c:769) [ 9.012953][ T192] __x64_sys_finit_module (kernel/module/main.c:3828 kernel/module/main.c:3812 kernel/module/main.c:3812) [ 9.012954][ T192] ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40 (discriminator 22)) [ 9.012958][ T192] do_syscall_64 (arch/x86/entry/syscall_64.c:61 arch/x86/entry/syscall_64.c:84) [ 9.012961][ T192] ? exc_page_fault (arch/x86/mm/fault.c:1489 (discriminator 3) arch/x86/mm/fault.c:1536 (discriminator 3)) [ 9.012963][ T192] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121) [ 9.012965][ T192] RIP: 0033:0x7f3268e2d37d [ 9.012969][ T192] Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa 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 8b 0d 4b aa 0f 00 f7 d8 64 89 01 48 All code ======== 0: ff c3 inc %ebx 2: 66 2e 0f 1f 84 00 00 cs nopw 0x0(%rax,%rax,1) 9: 00 00 00 c: 90 nop d: f3 0f 1e fa endbr64 11: 48 89 f8 mov %rdi,%rax 14: 48 89 f7 mov %rsi,%rdi 17: 48 89 d6 mov %rdx,%rsi 1a: 48 89 ca mov %rcx,%rdx 1d: 4d 89 c2 mov %r8,%r10 20: 4d 89 c8 mov %r9,%r8 23: 4c 8b 4c 24 08 mov 0x8(%rsp),%r9 28: 0f 05 syscall 2a:* 48 3d 01 f0 ff ff cmp $0xfffffffffffff001,%rax <-- trapping instruction 30: 73 01 jae 0x33 32: c3 ret 33: 48 8b 0d 4b aa 0f 00 mov 0xfaa4b(%rip),%rcx # 0xfaa85 3a: f7 d8 neg %eax 3c: 64 89 01 mov %eax,%fs:(%rcx) 3f: 48 rex.W Code starting with the faulting instruction =========================================== 0: 48 3d 01 f0 ff ff cmp $0xfffffffffffff001,%rax 6: 73 01 jae 0x9 8: c3 ret 9: 48 8b 0d 4b aa 0f 00 mov 0xfaa4b(%rip),%rcx # 0xfaa5b 10: f7 d8 neg %eax 12: 64 89 01 mov %eax,%fs:(%rcx) 15: 48 rex.W [ 9.012970][ T192] RSP: 002b:00007ffd1409d4b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000139 [ 9.012973][ T192] RAX: ffffffffffffffda RBX: 0000564dd0971970 RCX: 00007f3268e2d37d [ 9.012974][ T192] RDX: 0000000000000000 RSI: 0000564db4b29ffd RDI: 0000000000000005 [ 9.012975][ T192] RBP: 00007ffd1409d550 R08: 0000000000000000 R09: 0000000000000000 [ 9.012976][ T192] R10: 0000000000000000 R11: 0000000000000246 R12: 0000564db4b29ffd [ 9.012977][ T192] R13: 0000564dd0971aa0 R14: 0000000000040000 R15: 0000000000000000 | [ 10.012945][ T192] softirqs last disabled at (454212): __alloc_skb (./include/linux/bottom_half.h:20 (discriminator 2) net/core/skbuff.c:697 (discriminator 2)) | [ 10.012947][ T192] Preemption disabled at: | [ 10.012948][ T192] vprintk_emit (kernel/printk/printk.c:2471) | [ 10.012957][ T192] Tainted: [W]=WARN [ 10.012957][ T192] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 10.012959][ T192] Call Trace: [ 10.012960][ T192] [ 10.012962][ T192] dump_stack_lvl (lib/dump_stack.c:94 lib/dump_stack.c:120) [ 10.012968][ T192] ? vprintk_emit (kernel/printk/printk.c:2471) [ 10.012970][ T192] __might_resched.cold (kernel/sched/core.c:9234) [ 10.012974][ T192] ? perf_trace_sched_switch (./include/linux/list.h:1037 (discriminator 3)) [ 10.012978][ T192] ? __kmalloc_noprof (./include/linux/sched/mm.h:317 mm/slub.c:4636 mm/slub.c:4974 mm/slub.c:5413 mm/slub.c:5439) [ 10.012982][ T192] __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)) [ 10.012984][ T192] ? alloc_buf.isra.0 (./include/linux/slab.h:995 drivers/char/virtio_console.c:429) [ 10.012990][ T192] ? 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) [ 10.012993][ T192] alloc_buf.isra.0 (./include/linux/slab.h:995 drivers/char/virtio_console.c:429) [ 10.012996][ T192] put_chars (drivers/char/virtio_console.c:1176) [ 10.012998][ T192] ? __send_to_port (drivers/char/virtio_console.c:654) [ 10.013001][ T192] ? validate_chain (kernel/locking/lockdep.c:3817 (discriminator 2) kernel/locking/lockdep.c:3837 (discriminator 2) kernel/locking/lockdep.c:3892 (discriminator 2)) [ 10.013005][ T192] hvc_console_print (drivers/tty/hvc/hvc_console.c:177 (discriminator 2)) [ 10.013013][ T192] ? hvc_write (drivers/tty/hvc/hvc_console.c:501) [ 10.013015][ T192] ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:753 (discriminator 3)) [ 10.013018][ T192] ? lock_acquire (./include/trace/events/lock.h:23 (discriminator 22) kernel/locking/lockdep.c:5871 (discriminator 22)) [ 10.013022][ T192] console_emit_next_record (kernel/printk/printk.c:3183) [ 10.013025][ T192] ? devkmsg_read (./arch/x86/include/asm/atomic64_64.h:20) [ 10.013027][ T192] ? console_flush_one_record (./include/linux/rcupdate.h:314 (discriminator 2) ./include/linux/srcu.h:439 (discriminator 2) kernel/printk/printk.c:291 (discriminator 2) kernel/printk/printk.c:3246 (discriminator 2)) [ 10.013030][ T192] ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:753 (discriminator 3)) [ 10.013032][ T192] ? lock_acquire (./include/trace/events/lock.h:23 (discriminator 22) kernel/locking/lockdep.c:5871 (discriminator 22)) [ 10.013036][ T192] console_flush_one_record (kernel/printk/printk.c:3268) [ 10.013039][ T192] ? console_emit_next_record (kernel/printk/printk.c:3150) [ 10.013041][ T192] ? __lock_acquire (kernel/locking/lockdep.c:5254) [ 10.013046][ T192] console_unlock (kernel/printk/printk.c:3350 kernel/printk/printk.c:3380 kernel/printk/printk.c:3420) [ 10.013049][ T192] ? console_flush_one_record (kernel/printk/printk.c:3316) [ 10.013051][ T192] ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:753 (discriminator 3)) [ 10.013052][ T192] ? lock_acquire (./include/linux/srcutree.h:374 ./include/linux/srcu.h:541 ./include/linux/srcu.h:645 ./include/trace/events/lock.h:23 ./include/trace/events/lock.h:23 kernel/locking/lockdep.c:5871) [ 10.013056][ T192] ? __down_trylock_console_sem (kernel/printk/printk.c:334) [ 10.013057][ T192] ? vprintk_emit (kernel/printk/printk.c:2478) [ 10.013060][ T192] vprintk_emit (kernel/printk/printk.c:2479) [ 10.013063][ T192] ? wake_up_klogd_work_func (kernel/printk/printk.c:4603 (discriminator 126)) [ 10.013064][ T192] ? __queue_work (./include/linux/rcupdate.h:319 (discriminator 2) ./include/linux/rcupdate.h:880 (discriminator 2) kernel/workqueue.c:2459 (discriminator 2)) [ 10.013068][ T192] ? __queue_work (./include/linux/rcupdate.h:882 kernel/workqueue.c:2459) [ 10.013072][ T192] _printk (kernel/printk/printk.c:2504) [ 10.013076][ T192] ? snapshot_read.cold (user.c:?) [ 10.013079][ T192] ? rcu_is_watching (kernel/rcu/tree.c:754 (discriminator 3)) [ 10.013082][ T192] ? queue_work_on (kernel/workqueue.c:2505 (discriminator 6)) [ 10.013085][ T192] test_bpf (lib/test_bpf.c:267) test_bpf [ 10.013093][ T192] ? prepare_tail_call_tests.constprop.0 (lib/test_bpf.c:286) test_bpf [ 10.013100][ T192] ? test_bpf (lib/test_bpf.c:259) test_bpf [ 10.013103][ T192] test_bpf_init (lib/test_bpf.c:231) test_bpf [ 10.013107][ T192] ? test_bpf (lib/test_bpf.c:259) test_bpf [ 10.013113][ T192] ? test_bpf (lib/test_bpf.c:259) test_bpf [ 10.013116][ T192] do_one_initcall (init/main.c:1357) [ 10.013120][ T192] ? trace_event_raw_event_initcall_level (./include/trace/events/initcall.h:10) [ 10.013124][ T192] ? do_init_module (./include/linux/slab.h:991 (discriminator 1) kernel/module/main.c:3105 (discriminator 1)) [ 10.013127][ T192] ? kasan_unpoison (mm/kasan/shadow.c:146 mm/kasan/shadow.c:178) [ 10.013132][ T192] do_init_module (kernel/module/main.c:3117) [ 10.013135][ T192] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4488) [ 10.013139][ T192] ? free_module (./include/trace/events/module.h:50 (discriminator 19)) [ 10.013141][ T192] ? kfree (./include/linux/kasan.h:235 mm/slub.c:2748 mm/slub.c:6499 mm/slub.c:6792) [ 10.013144][ T192] load_module (kernel/module/main.c:3593) [ 10.013149][ T192] ? security_kernel_post_read_file (security/security.c:2997 (discriminator 11)) [ 10.013154][ T192] ? layout_and_allocate.isra.0 (kernel/module/main.c:3016) [ 10.013157][ T192] ? __ia32_sys_fsconfig (??:?) [ 10.013160][ T192] ? add_chain_cache (kernel/locking/lockdep.c:3782) [ 10.013165][ T192] init_module_from_file (kernel/module/main.c:3790) [ 10.013167][ T192] ? __do_sys_init_module (kernel/module/main.c:3664) [ 10.013174][ T192] ? __rwlock_init (kernel/locking/spinlock_debug.c:48) [ 10.013178][ T192] ? 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) [ 10.013181][ T192] idempotent_init_module (kernel/module/main.c:3802) [ 10.013183][ T192] ? init_module_from_file (kernel/module/main.c:3791) [ 10.013189][ T192] ? cap_capable (./include/trace/events/capability.h:26 (discriminator 22) security/commoncap.c:130 (discriminator 22)) [ 10.013191][ T192] ? __x64_sys_pread64 (fs/read_write.c:764 fs/read_write.c:772 fs/read_write.c:769 fs/read_write.c:769) [ 10.013196][ T192] __x64_sys_finit_module (kernel/module/main.c:3828 kernel/module/main.c:3812 kernel/module/main.c:3812) [ 10.013197][ T192] ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40 (discriminator 22)) [ 10.013201][ T192] do_syscall_64 (arch/x86/entry/syscall_64.c:61 arch/x86/entry/syscall_64.c:84) [ 10.013204][ T192] ? exc_page_fault (arch/x86/mm/fault.c:1489 (discriminator 3) arch/x86/mm/fault.c:1536 (discriminator 3)) [ 10.013206][ T192] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121) [ 10.013208][ T192] RIP: 0033:0x7f3268e2d37d [ 10.013212][ T192] Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa 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 8b 0d 4b aa 0f 00 f7 d8 64 89 01 48 All code ======== 0: ff c3 inc %ebx 2: 66 2e 0f 1f 84 00 00 cs nopw 0x0(%rax,%rax,1) 9: 00 00 00 c: 90 nop d: f3 0f 1e fa endbr64 11: 48 89 f8 mov %rdi,%rax 14: 48 89 f7 mov %rsi,%rdi 17: 48 89 d6 mov %rdx,%rsi 1a: 48 89 ca mov %rcx,%rdx 1d: 4d 89 c2 mov %r8,%r10 20: 4d 89 c8 mov %r9,%r8 23: 4c 8b 4c 24 08 mov 0x8(%rsp),%r9 28: 0f 05 syscall 2a:* 48 3d 01 f0 ff ff cmp $0xfffffffffffff001,%rax <-- trapping instruction 30: 73 01 jae 0x33 32: c3 ret 33: 48 8b 0d 4b aa 0f 00 mov 0xfaa4b(%rip),%rcx # 0xfaa85 3a: f7 d8 neg %eax 3c: 64 89 01 mov %eax,%fs:(%rcx) 3f: 48 rex.W Code starting with the faulting instruction =========================================== 0: 48 3d 01 f0 ff ff cmp $0xfffffffffffff001,%rax 6: 73 01 jae 0x9 8: c3 ret 9: 48 8b 0d 4b aa 0f 00 mov 0xfaa4b(%rip),%rcx # 0xfaa5b 10: f7 d8 neg %eax 12: 64 89 01 mov %eax,%fs:(%rcx) 15: 48 rex.W [ 10.013214][ T192] RSP: 002b:00007ffd1409d4b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000139 [ 10.013216][ T192] RAX: ffffffffffffffda RBX: 0000564dd0971970 RCX: 00007f3268e2d37d [ 10.013218][ T192] RDX: 0000000000000000 RSI: 0000564db4b29ffd RDI: 0000000000000005 [ 10.013218][ T192] RBP: 00007ffd1409d550 R08: 0000000000000000 R09: 0000000000000000 [ 10.013222][ T192] R10: 0000000000000000 R11: 0000000000000246 R12: 0000564db4b29ffd Finger prints: __alloc_skb:vprintk_emit:dump_stack_lvl:__kmalloc_noprof:put_chars