======================================
| [ 140.682605][ C2] page dumped because: VM_BUG_ON_PAGE(page_ref_count(page) == 0)
| [ 140.682904][ C2] ------------[ cut here ]------------
| [ 140.683131][ C2] kernel BUG at include/linux/mm.h:1140!
| [ 140.683353][ C2] Oops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN NOPTI
[ 140.683845][ C2] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[ 140.684240][ C2] RIP: 0010:__free_pages (./include/linux/mm.h:1140 ./include/linux/mm.h:1138 mm/page_alloc.c:4819)
[ 140.684424][ C2] Code: 0f 94 c3 e9 ba fe ff ff 48 c7 c6 a0 18 98 ba 4c 89 e7 e8 df bf f4 ff 90 0f 0b 48 c7 c6 40 29 98 ba 4c 89 e7 e8 cd bf f4 ff 90 <0f> 0b 48 89 ef e8 72 03 09 00 e9 c5 fe ff ff e8 98 03 09 00 e9 35
All code
========
0: 0f 94 c3 sete %bl
3: e9 ba fe ff ff jmp 0xfffffffffffffec2
8: 48 c7 c6 a0 18 98 ba mov $0xffffffffba9818a0,%rsi
f: 4c 89 e7 mov %r12,%rdi
12: e8 df bf f4 ff call 0xfffffffffff4bff6
17: 90 nop
18: 0f 0b ud2
1a: 48 c7 c6 40 29 98 ba mov $0xffffffffba982940,%rsi
21: 4c 89 e7 mov %r12,%rdi
24: e8 cd bf f4 ff call 0xfffffffffff4bff6
29: 90 nop
2a:* 0f 0b ud2 <-- trapping instruction
2c: 48 89 ef mov %rbp,%rdi
2f: e8 72 03 09 00 call 0x903a6
34: e9 c5 fe ff ff jmp 0xfffffffffffffefe
39: e8 98 03 09 00 call 0x903d6
3e: e9 .byte 0xe9
3f: 35 .byte 0x35
Code starting with the faulting instruction
===========================================
0: 0f 0b ud2
2: 48 89 ef mov %rbp,%rdi
5: e8 72 03 09 00 call 0x9037c
a: e9 c5 fe ff ff jmp 0xfffffffffffffed4
f: e8 98 03 09 00 call 0x903ac
14: e9 .byte 0xe9
15: 35 .byte 0x35
[ 140.685039][ C2] RSP: 0018:ffffc90000240df8 EFLAGS: 00010246
[ 140.685262][ C2] RAX: 000000000000003e RBX: 0000000000000000 RCX: 1ffffffff76bb43c
[ 140.685520][ C2] RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000001
[ 140.685781][ C2] RBP: ffffea0000275f34 R08: 0000000000000000 R09: fffffbfff76bb43c
[ 140.686076][ C2] R10: 0000000000000003 R11: 205d324320202020 R12: ffffea0000275f00
[ 140.686331][ C2] R13: ffffc90000240ec0 R14: 0000000000000000 R15: 000000000000015b
[ 140.686583][ C2] FS: 0000000000000000(0000) GS:ffff88802f500000(0000) knlGS:0000000000000000
[ 140.686972][ C2] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 140.687185][ C2] CR2: 000055f8e648fdec CR3: 0000000007cc0004 CR4: 0000000000772ef0
[ 140.687449][ C2] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 140.687791][ C2] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 140.688053][ C2] PKRU: 55555554
[ 140.688190][ C2] Call Trace:
[ 140.688317][ C2]
[ 140.688405][ C2] ? die (arch/x86/kernel/dumpstack.c:421 arch/x86/kernel/dumpstack.c:434 arch/x86/kernel/dumpstack.c:447)
[ 140.688547][ C2] ? do_trap (arch/x86/kernel/traps.c:156 arch/x86/kernel/traps.c:197)
[ 140.688763][ C2] ? __free_pages (./include/linux/mm.h:1140 ./include/linux/mm.h:1138 mm/page_alloc.c:4819)
[ 140.688942][ C2] ? do_error_trap (./arch/x86/include/asm/traps.h:58 arch/x86/kernel/traps.c:218)
[ 140.689112][ C2] ? __free_pages (./include/linux/mm.h:1140 ./include/linux/mm.h:1138 mm/page_alloc.c:4819)
[ 140.689308][ C2] ? __free_pages (./include/linux/mm.h:1140 ./include/linux/mm.h:1138 mm/page_alloc.c:4819)
[ 140.689478][ C2] ? handle_invalid_op (arch/x86/kernel/traps.c:256)
[ 140.689648][ C2] ? __free_pages (./include/linux/mm.h:1140 ./include/linux/mm.h:1138 mm/page_alloc.c:4819)
[ 140.689931][ C2] ? exc_invalid_op (arch/x86/kernel/traps.c:315)
[ 140.690107][ C2] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:621)
[ 140.690385][ C2] ? __free_pages (./include/linux/mm.h:1140 ./include/linux/mm.h:1138 mm/page_alloc.c:4819)
[ 140.690620][ C2] ? __free_pages (./include/linux/mm.h:1140 ./include/linux/mm.h:1138 mm/page_alloc.c:4819)
[ 140.690788][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2567)
[ 140.690970][ C2] neigh_hash_free_rcu (net/core/neighbour.c:555)
[ 140.691234][ C2] rcu_do_batch (kernel/rcu/tree.c:2567)
[ 140.691447][ C2] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2491)
[ 140.691617][ C2] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4339 kernel/locking/lockdep.c:4406)
[ 140.691846][ C2] rcu_core (kernel/rcu/tree.c:2825)
[ 140.691981][ C2] handle_softirqs (kernel/softirq.c:554)
[ 140.692278][ C2] irq_exit_rcu (kernel/softirq.c:589 kernel/softirq.c:428 kernel/softirq.c:637 kernel/softirq.c:649)
[ 140.692433][ C2] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1037 arch/x86/kernel/apic/apic.c:1037)
[ 140.692619][ C2]
[ 140.692705][ C2]
[ 140.692792][ C2] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702)
[ 140.693012][ C2] RIP: 0010:default_idle (./arch/x86/include/asm/irqflags.h:37 ./arch/x86/include/asm/irqflags.h:92 arch/x86/kernel/process.c:743)
[ 140.693194][ C2] Code: 4c 01 c7 4c 29 c2 e9 72 ff ff ff 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d e3 4e 3f 00 fb f4 c3 cc cc cc cc 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90
All code
========
0: 4c 01 c7 add %r8,%rdi
3: 4c 29 c2 sub %r8,%rdx
6: e9 72 ff ff ff jmp 0xffffffffffffff7d
b: 90 nop
c: 90 nop
d: 90 nop
e: 90 nop
f: 90 nop
10: 90 nop
11: 90 nop
12: 90 nop
13: 90 nop
14: 90 nop
15: 90 nop
16: 90 nop
17: 90 nop
18: 90 nop
19: 90 nop
1a: 90 nop
1b: f3 0f 1e fa endbr64
1f: 66 90 xchg %ax,%ax
21: 0f 00 2d e3 4e 3f 00 verw 0x3f4ee3(%rip) # 0x3f4f0b
28: fb sti
29: f4 hlt
2a:* fa cli <-- trapping instruction
2b: c3 ret
2c: cc int3
2d: cc int3
2e: cc int3
2f: cc int3
30: 66 66 2e 0f 1f 84 00 data16 cs nopw 0x0(%rax,%rax,1)
37: 00 00 00 00
3b: 90 nop
3c: 90 nop
3d: 90 nop
3e: 90 nop
3f: 90 nop
Code starting with the faulting instruction
===========================================
0: fa cli
1: c3 ret
2: cc int3
3: cc int3
4: cc int3
5: cc int3
6: 66 66 2e 0f 1f 84 00 data16 cs nopw 0x0(%rax,%rax,1)
d: 00 00 00 00
11: 90 nop
12: 90 nop
13: 90 nop
14: 90 nop
15: 90 nop
[ 140.693963][ C2] RSP: 0018:ffffc9000016fdf8 EFLAGS: 00000246
[ 140.694172][ C2] RAX: 000000000035f0c9 RBX: 1ffff9200002dfc1 RCX: ffffffffba46c435
[ 140.694445][ C2] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffffb7cb1f94
[ 140.694722][ C2] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1005ea70e2
[ 140.695085][ C2] R10: ffff88802f538713 R11: ffff88802f53dd40 R12: 0000000000000000
[ 140.695357][ C2] R13: ffff888001bb0040 R14: dffffc0000000000 R15: 0000000000000000
[ 140.695616][ C2] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:147)
[ 140.695784][ C2] ? cpuidle_idle_call (kernel/sched/idle.c:186)
[ 140.695971][ C2] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118)
[ 140.696328][ C2] cpuidle_idle_call (kernel/sched/idle.c:186)
[ 140.696499][ C2] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168)
[ 140.696699][ C2] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59)
[ 140.696872][ C2] do_idle (kernel/sched/idle.c:326)
[ 140.697013][ C2] cpu_startup_entry (kernel/sched/idle.c:423 (discriminator 1))
[ 140.697182][ C2] start_secondary (arch/x86/kernel/smpboot.c:202 arch/x86/kernel/smpboot.c:282)
[ 140.697457][ C2] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:232)
Finger prints:
__free_pages:neigh_hash_free_rcu:rcu_do_batch:rcu_core:handle_softirqs