====================================== | [ 149.986192][ C1] page dumped because: VM_BUG_ON_PAGE(page_ref_count(page) == 0) | [ 149.986488][ C1] ------------[ cut here ]------------ | [ 149.986719][ C1] kernel BUG at include/linux/mm.h:1140! | [ 149.986924][ C1] Oops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN NOPTI [ 149.987353][ C1] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014 [ 149.987719][ C1] RIP: 0010:__free_pages (./include/linux/mm.h:1140 ./include/linux/mm.h:1138 mm/page_alloc.c:4819) [ 149.987872][ C1] Code: 0f 94 c3 e9 ba fe ff ff 48 c7 c6 a0 18 18 89 4c 89 e7 e8 df bf f4 ff 90 0f 0b 48 c7 c6 40 29 18 89 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 18 89 mov $0xffffffff891818a0,%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 18 89 mov $0xffffffff89182940,%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 [ 149.988443][ C1] RSP: 0018:ffffc900001e8e08 EFLAGS: 00010246 [ 149.988631][ C1] RAX: 000000000000003e RBX: 0000000000000000 RCX: 1ffffffff13bb43c [ 149.988866][ C1] RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000001 [ 149.989128][ C1] RBP: ffffea0000e05b34 R08: 0000000000000000 R09: fffffbfff13bb43c [ 149.989343][ C1] R10: 0000000000000003 R11: 205d314320202020 R12: ffffea0000e05b00 [ 149.989567][ C1] R13: ffffc900001e8ed0 R14: 0000000000000000 R15: 0000000000000007 [ 149.989812][ C1] FS: 00007fb66275c740(0000) GS:ffff88802f680000(0000) knlGS:0000000000000000 [ 149.990076][ C1] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 149.990264][ C1] CR2: 00007fb662bc7008 CR3: 0000000004858003 CR4: 0000000000772ef0 [ 149.990491][ C1] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 149.990723][ C1] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 149.990946][ C1] PKRU: 55555554 [ 149.991056][ C1] Call Trace: [ 149.991173][ C1] [ 149.991270][ C1] ? die (arch/x86/kernel/dumpstack.c:421 arch/x86/kernel/dumpstack.c:434 arch/x86/kernel/dumpstack.c:447) [ 149.991386][ C1] ? do_trap (arch/x86/kernel/traps.c:156 arch/x86/kernel/traps.c:197) [ 149.991499][ C1] ? __free_pages (./include/linux/mm.h:1140 ./include/linux/mm.h:1138 mm/page_alloc.c:4819) [ 149.991678][ C1] ? do_error_trap (./arch/x86/include/asm/traps.h:58 arch/x86/kernel/traps.c:218) [ 149.991846][ C1] ? __free_pages (./include/linux/mm.h:1140 ./include/linux/mm.h:1138 mm/page_alloc.c:4819) [ 149.992006][ C1] ? __free_pages (./include/linux/mm.h:1140 ./include/linux/mm.h:1138 mm/page_alloc.c:4819) [ 149.992156][ C1] ? handle_invalid_op (arch/x86/kernel/traps.c:256) [ 149.992312][ C1] ? __free_pages (./include/linux/mm.h:1140 ./include/linux/mm.h:1138 mm/page_alloc.c:4819) [ 149.992460][ C1] ? exc_invalid_op (arch/x86/kernel/traps.c:315) [ 149.992610][ C1] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:621) [ 149.992779][ C1] ? __free_pages (./include/linux/mm.h:1140 ./include/linux/mm.h:1138 mm/page_alloc.c:4819) [ 149.992925][ C1] ? __free_pages (./include/linux/mm.h:1140 ./include/linux/mm.h:1138 mm/page_alloc.c:4819) [ 149.993087][ C1] ? rcu_do_batch (kernel/rcu/tree.c:2567) [ 149.993249][ C1] neigh_hash_free_rcu (net/core/neighbour.c:554) [ 149.993409][ C1] rcu_do_batch (kernel/rcu/tree.c:2567) [ 149.993566][ C1] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2491) [ 149.993816][ C1] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4339 kernel/locking/lockdep.c:4406) [ 149.994014][ C1] rcu_core (kernel/rcu/tree.c:2825) [ 149.994144][ C1] handle_softirqs (kernel/softirq.c:554) [ 149.994297][ C1] ? __dev_queue_xmit (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:917 net/core/dev.c:4457) [ 149.994460][ C1] do_softirq (kernel/softirq.c:455 kernel/softirq.c:442) [ 149.994662][ C1] [ 149.994739][ C1] [ 149.994815][ C1] __local_bh_enable_ip (kernel/softirq.c:382) [ 149.995004][ C1] ? __dev_queue_xmit (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:917 net/core/dev.c:4457) [ 149.995161][ C1] __dev_queue_xmit (net/core/dev.c:4458) [ 149.995405][ C1] ? __lock_release (kernel/locking/lockdep.c:5501) [ 149.995564][ C1] ? ip6_finish_output2 (./include/net/neighbour.h:537 net/ipv6/ip6_output.c:141) [ 149.995726][ C1] ? __pfx___lock_release (kernel/locking/lockdep.c:5477) [ 149.995875][ C1] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5790) [ 149.996027][ C1] ? __pfx___dev_queue_xmit (net/core/dev.c:4339) [ 149.996179][ C1] ? eth_header (net/ethernet/eth.c:100) [ 149.996339][ C1] ? neigh_resolve_output (./include/linux/netdevice.h:3216 net/core/neighbour.c:1524 net/core/neighbour.c:1509) [ 149.996486][ C1] ip6_finish_output2 (./include/net/neighbour.h:537 net/ipv6/ip6_output.c:141) [ 149.996637][ C1] ip6_finish_output (net/ipv6/ip6_output.c:215 net/ipv6/ip6_output.c:226) [ 149.996912][ C1] ? hlock_class (./arch/x86/include/asm/bitops.h:227 ./arch/x86/include/asm/bitops.h:239 ./include/asm-generic/bitops/instrumented-non-atomic.h:142 kernel/locking/lockdep.c:228) [ 149.997059][ C1] ip6_output (./include/linux/netfilter.h:303 net/ipv6/ip6_output.c:247) [ 149.997169][ C1] ? __pfx_ip6_output (net/ipv6/ip6_output.c:234) [ 149.997318][ C1] NF_HOOK.constprop.0 (./include/linux/rcupdate.h:337 ./include/linux/rcupdate.h:849 ./include/linux/netfilter.h:238 ./include/linux/netfilter.h:312) [ 149.997564][ C1] ? __pfx_NF_HOOK.constprop.0 (./include/linux/netfilter.h:308) [ 149.997715][ C1] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5790) [ 149.997860][ C1] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) [ 149.998014][ C1] ? rawv6_send_hdrinc (./include/linux/rcupdate.h:337 ./include/linux/rcupdate.h:849 net/ipv6/raw.c:659) [ 149.998182][ C1] ? lock_acquire (kernel/locking/lockdep.c:5798) [ 149.998339][ C1] ? rawv6_send_hdrinc (./include/linux/rcupdate.h:337 ./include/linux/rcupdate.h:849 net/ipv6/raw.c:659) [ 149.998518][ C1] rawv6_send_hdrinc (net/ipv6/raw.c:663 (discriminator 60)) [ 149.998678][ C1] ? __pfx_rawv6_send_hdrinc (net/ipv6/raw.c:596) [ 149.998837][ C1] ? ip6_dst_hoplimit.part.0.isra.0 (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/ipv6/output_core.c:117) [ 149.999133][ C1] rawv6_sendmsg (net/ipv6/raw.c:914) [ 149.999294][ C1] ? __pfx_rawv6_sendmsg (net/ipv6/raw.c:741) [ 149.999438][ C1] ? __lock_acquire (kernel/locking/lockdep.c:5202) [ 149.999612][ C1] ? find_held_lock (kernel/locking/lockdep.c:5315) [ 149.999848][ C1] ? __lock_release (kernel/locking/lockdep.c:5501) [ 149.999993][ C1] ? __might_fault (mm/memory.c:6700 mm/memory.c:6693) [ 150.000147][ C1] ? lock_acquire (kernel/locking/lockdep.c:5798) [ 150.000301][ C1] ? __might_fault (mm/memory.c:6700 mm/memory.c:6693) [ 150.000545][ C1] ? __might_fault (mm/memory.c:6700 mm/memory.c:6693) [ 150.000685][ C1] ? __sys_sendto (net/socket.c:729 net/socket.c:744 net/socket.c:2214) [ 150.000829][ C1] __sys_sendto (net/socket.c:729 net/socket.c:744 net/socket.c:2214) [ 150.000984][ C1] ? __pfx___sys_sendto (net/socket.c:2184) [ 150.001147][ C1] ? __might_fault (mm/memory.c:6700 mm/memory.c:6693) [ 150.001330][ C1] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) [ 150.001488][ C1] ? lock_acquire (kernel/locking/lockdep.c:5798) [ 150.001639][ C1] ? __might_fault (mm/memory.c:6700 mm/memory.c:6693) [ 150.001871][ C1] ? trace_rseq_update (./include/trace/events/rseq.h:11 (discriminator 52)) [ 150.002027][ C1] ? __pfx___rseq_handle_notify_resume (kernel/rseq.c:316) [ 150.002262][ C1] ? __pfx_task_work_run (kernel/task_work.c:196) [ 150.002448][ C1] __x64_sys_sendto (net/socket.c:2222) [ 150.002674][ C1] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406) [ 150.002848][ C1] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) [ 150.003028][ C1] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) [ 150.003238][ C1] RIP: 0033:0x7fb6629b685a [ 150.003516][ C1] Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb b8 0f 1f 00 f3 0f 1e fa 41 89 ca 64 8b 04 25 18 00 00 00 85 c0 75 15 b8 2c 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 7e c3 0f 1f 44 00 00 41 54 48 83 ec 30 44 89 All code ======== 0: d8 64 89 02 fsubs 0x2(%rcx,%rcx,4) 4: 48 c7 c0 ff ff ff ff mov $0xffffffffffffffff,%rax b: eb b8 jmp 0xffffffffffffffc5 d: 0f 1f 00 nopl (%rax) 10: f3 0f 1e fa endbr64 14: 41 89 ca mov %ecx,%r10d 17: 64 8b 04 25 18 00 00 mov %fs:0x18,%eax 1e: 00 1f: 85 c0 test %eax,%eax 21: 75 15 jne 0x38 23: b8 2c 00 00 00 mov $0x2c,%eax 28: 0f 05 syscall 2a:* 48 3d 00 f0 ff ff cmp $0xfffffffffffff000,%rax <-- trapping instruction 30: 77 7e ja 0xb0 32: c3 ret 33: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1) 38: 41 54 push %r12 3a: 48 83 ec 30 sub $0x30,%rsp 3e: 44 rex.R 3f: 89 .byte 0x89 Code starting with the faulting instruction =========================================== 0: 48 3d 00 f0 ff ff cmp $0xfffffffffffff000,%rax 6: 77 7e ja 0x86 8: c3 ret 9: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1) e: 41 54 push %r12 10: 48 83 ec 30 sub $0x30,%rsp 14: 44 rex.R 15: 89 .byte 0x89 [ 150.004038][ C1] RSP: 002b:00007fffe335fb38 EFLAGS: 00000246 ORIG_RAX: 000000000000002c [ 150.004266][ C1] RAX: ffffffffffffffda RBX: 000000003b39aec0 RCX: 00007fb6629b685a [ 150.004498][ C1] RDX: 0000000000000070 RSI: 000000003b39b160 RDI: 0000000000000005 [ 150.004716][ C1] RBP: 000000003b39aec0 R08: 00007fffe335fb40 R09: 000000000000001c [ 150.005017][ C1] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000070 Finger prints: __free_pages:neigh_hash_free_rcu:rcu_do_batch:rcu_core:handle_softirqs