====================================== | [ 4568.991776][ C0] ================================================================== | [ 4568.992118][ C0] BUG: KASAN: null-ptr-deref in sock_def_write_space_wfree (./arch/x86/include/asm/bitops.h:206 ./arch/x86/include/asm/bitops.h:238 ./include/asm-generic/bitops/instrumented-non-atomic.h:142 net/core/sock.c:3397) | [ 4568.992354][ C0] Read of size 8 at addr 0000000000000008 by task swapper/0/0 | [ 4568.992573][ C0] [ 4568.992879][ C0] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014 [ 4568.993211][ C0] Call Trace: [ 4568.993325][ C0] [ 4568.993406][ C0] dump_stack_lvl (lib/dump_stack.c:117) [ 4568.993564][ C0] kasan_report (mm/kasan/report.c:603) [ 4568.993678][ C0] ? sock_def_write_space_wfree (./arch/x86/include/asm/bitops.h:206 ./arch/x86/include/asm/bitops.h:238 ./include/asm-generic/bitops/instrumented-non-atomic.h:142 net/core/sock.c:3397) [ 4568.993868][ C0] kasan_check_range (mm/kasan/generic.c:183 mm/kasan/generic.c:189) [ 4568.994018][ C0] sock_def_write_space_wfree (./arch/x86/include/asm/bitops.h:206 ./arch/x86/include/asm/bitops.h:238 ./include/asm-generic/bitops/instrumented-non-atomic.h:142 net/core/sock.c:3397) [ 4568.994167][ C0] sock_wfree (./include/linux/rcupdate.h:810 net/core/sock.c:2471) [ 4568.994282][ C0] ip6_rcv_core (./include/linux/skbuff.h:3202 net/ipv6/ip6_input.c:291) [ 4568.994435][ C0] ipv6_rcv (net/ipv6/ip6_input.c:307) [ 4568.994546][ C0] ? __pfx_ipv6_rcv (net/ipv6/ip6_input.c:304) [ 4568.994695][ C0] ? lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5756) [ 4568.994844][ C0] ? process_backlog (./include/linux/rcupdate.h:329 ./include/linux/rcupdate.h:781 net/core/dev.c:6046) [ 4568.995000][ C0] ? __pfx_ipv6_rcv (net/ipv6/ip6_input.c:304) [ 4568.995146][ C0] __netif_receive_skb_one_core (net/core/dev.c:5597) [ 4568.995327][ C0] ? __pfx___netif_receive_skb_one_core (net/core/dev.c:5597) [ 4568.995513][ C0] ? process_backlog (./include/linux/rcupdate.h:329 ./include/linux/rcupdate.h:781 net/core/dev.c:6046) [ 4568.995658][ C0] ? lock_acquire (kernel/locking/lockdep.c:5727) [ 4568.995832][ C0] ? process_backlog (./include/linux/rcupdate.h:329 ./include/linux/rcupdate.h:781 net/core/dev.c:6046) [ 4568.995987][ C0] process_backlog (./include/linux/rcupdate.h:810 net/core/dev.c:6048) [ 4568.996142][ C0] __napi_poll.constprop.0 (net/core/dev.c:6701) [ 4568.996296][ C0] net_rx_action (net/core/dev.c:6770 net/core/dev.c:6886) [ 4568.996453][ C0] ? __pfx_net_rx_action (net/core/dev.c:6850) [ 4568.996608][ C0] __do_softirq (kernel/softirq.c:554) [ 4568.996767][ C0] irq_exit_rcu (kernel/softirq.c:428 kernel/softirq.c:633 kernel/softirq.c:645) [ 4568.996883][ C0] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1043 arch/x86/kernel/apic/apic.c:1043) [ 4568.997048][ C0] [ 4568.997126][ C0] [ 4568.997201][ C0] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) [ 4568.997386][ C0] RIP: 0010:default_idle (./arch/x86/include/asm/irqflags.h:37 ./arch/x86/include/asm/irqflags.h:72 arch/x86/kernel/process.c:743) [ 4568.997546][ C0] 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 cc 32 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 cc 32 00 verw 0x32cce3(%rip) # 0x32cd0b 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 [ 4568.998084][ C0] RSP: 0018:ffffffffa6407e00 EFLAGS: 00000242 [ 4568.998279][ C0] RAX: 0000000002284989 RBX: 1ffffffff4c80fc2 RCX: ffffffffa5534e95 [ 4568.998503][ C0] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffffa2cac0e4 [ 4568.998721][ C0] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1005ec709c [ 4568.998956][ C0] R10: ffff88802f6384e3 R11: ffff88802f62d9b0 R12: 0000000000000000 [ 4568.999194][ C0] R13: ffffffffa6431000 R14: dffffc0000000000 R15: 0000000000014770 [ 4568.999420][ C0] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:147) [ 4568.999569][ C0] ? cpuidle_idle_call (kernel/sched/idle.c:192) [ 4568.999721][ C0] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) [ 4568.999882][ C0] cpuidle_idle_call (kernel/sched/idle.c:192) [ 4569.000028][ C0] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) [ 4569.000178][ C0] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) [ 4569.000327][ C0] do_idle (kernel/sched/idle.c:332) [ 4569.000438][ C0] cpu_startup_entry (kernel/sched/idle.c:429 (discriminator 1)) [ 4569.000588][ C0] rest_init (./include/linux/rcupdate.h:782 init/main.c:703) [ 4569.000700][ C0] start_kernel (init/main.c:1024 (discriminator 1)) [ 4569.000847][ C0] x86_64_start_reservations (arch/x86/kernel/head64.c:495) [ 4569.000996][ C0] x86_64_start_kernel (arch/x86/kernel/head64.c:437 (discriminator 17)) [ 4569.001160][ C0] common_startup_64 (arch/x86/kernel/head_64.S:421) | [ 4569.001428][ C0] ================================================================== | [ 4569.001650][ C0] Disabling lock debugging due to kernel taint | [ 4569.001865][ C0] general protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] PREEMPT SMP KASAN NOPTI | [ 4569.002192][ C0] KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f] [ 4569.002670][ C0] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014 [ 4569.002987][ C0] RIP: 0010:sock_def_write_space_wfree (./arch/x86/include/asm/bitops.h:206 ./arch/x86/include/asm/bitops.h:238 ./include/asm-generic/bitops/instrumented-non-atomic.h:142 net/core/sock.c:3397) [ 4569.003172][ C0] Code: 00 4c 8b bb a0 01 00 00 be 08 00 00 00 4d 8d 77 08 4c 89 f7 e8 e0 0e 8b fe 4c 89 f2 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <80> 3c 02 00 0f 85 fe 00 00 00 49 8b 47 08 a8 04 0f 85 dc fe ff ff All code ======== 0: 00 4c 8b bb add %cl,-0x45(%rbx,%rcx,4) 4: a0 01 00 00 be 08 00 movabs 0x8be000001,%al b: 00 00 d: 4d 8d 77 08 lea 0x8(%r15),%r14 11: 4c 89 f7 mov %r14,%rdi 14: e8 e0 0e 8b fe call 0xfffffffffe8b0ef9 19: 4c 89 f2 mov %r14,%rdx 1c: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 23: fc ff df 26: 48 c1 ea 03 shr $0x3,%rdx 2a:* 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) <-- trapping instruction 2e: 0f 85 fe 00 00 00 jne 0x132 34: 49 8b 47 08 mov 0x8(%r15),%rax 38: a8 04 test $0x4,%al 3a: 0f 85 dc fe ff ff jne 0xffffffffffffff1c Code starting with the faulting instruction =========================================== 0: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) 4: 0f 85 fe 00 00 00 jne 0x108 a: 49 8b 47 08 mov 0x8(%r15),%rax e: a8 04 test $0x4,%al 10: 0f 85 dc fe ff ff jne 0xfffffffffffffef2 [ 4569.003676][ C0] RSP: 0018:ffffc90000007b28 EFLAGS: 00010202 [ 4569.003873][ C0] RAX: dffffc0000000000 RBX: ffff88800aa01140 RCX: ffffffffa2b9564a [ 4569.004088][ C0] RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffffffffa80fda00 [ 4569.004301][ C0] RBP: ffff88800aa011a0 R08: 0000000000000001 R09: fffffbfff501fb40 [ 4569.004516][ C0] R10: ffffffffa80fda07 R11: 205d304320202020 R12: 0000000000000000 [ 4569.004732][ C0] R13: ffff88800aa012c0 R14: 0000000000000008 R15: 0000000000000000 [ 4569.004946][ C0] FS: 0000000000000000(0000) GS:ffff88802f600000(0000) knlGS:0000000000000000 [ 4569.005197][ C0] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 4569.005378][ C0] CR2: 00007f2bf4924258 CR3: 0000000034f38002 CR4: 0000000000770ef0 [ 4569.005593][ C0] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 4569.005834][ C0] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 4569.006056][ C0] PKRU: 55555554 [ 4569.006168][ C0] Call Trace: [ 4569.006280][ C0] [ 4569.006356][ C0] ? die_addr (arch/x86/kernel/dumpstack.c:421 arch/x86/kernel/dumpstack.c:460) [ 4569.006468][ C0] ? exc_general_protection (arch/x86/kernel/traps.c:702 arch/x86/kernel/traps.c:644) [ 4569.006616][ C0] ? asm_exc_general_protection (./arch/x86/include/asm/idtentry.h:617) [ 4569.006764][ C0] ? add_taint (./arch/x86/include/asm/bitops.h:60 ./include/asm-generic/bitops/instrumented-atomic.h:29 kernel/panic.c:555) [ 4569.006878][ C0] ? sock_def_write_space_wfree (./arch/x86/include/asm/bitops.h:206 ./arch/x86/include/asm/bitops.h:238 ./include/asm-generic/bitops/instrumented-non-atomic.h:142 net/core/sock.c:3397) [ 4569.007072][ C0] ? sock_def_write_space_wfree (./arch/x86/include/asm/bitops.h:206 ./arch/x86/include/asm/bitops.h:238 ./include/asm-generic/bitops/instrumented-non-atomic.h:142 net/core/sock.c:3397) [ 4569.007248][ C0] sock_wfree (./include/linux/rcupdate.h:810 net/core/sock.c:2471) [ 4569.007358][ C0] ip6_rcv_core (./include/linux/skbuff.h:3202 net/ipv6/ip6_input.c:291) [ 4569.007501][ C0] ipv6_rcv (net/ipv6/ip6_input.c:307) [ 4569.007609][ C0] ? __pfx_ipv6_rcv (net/ipv6/ip6_input.c:304) [ 4569.007751][ C0] ? lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5756) [ 4569.007894][ C0] ? process_backlog (./include/linux/rcupdate.h:329 ./include/linux/rcupdate.h:781 net/core/dev.c:6046) [ 4569.008039][ C0] ? __pfx_ipv6_rcv (net/ipv6/ip6_input.c:304) [ 4569.008181][ C0] __netif_receive_skb_one_core (net/core/dev.c:5597) [ 4569.008360][ C0] ? __pfx___netif_receive_skb_one_core (net/core/dev.c:5597) [ 4569.008537][ C0] ? process_backlog (./include/linux/rcupdate.h:329 ./include/linux/rcupdate.h:781 net/core/dev.c:6046) [ 4569.008679][ C0] ? lock_acquire (kernel/locking/lockdep.c:5727) [ 4569.008823][ C0] ? process_backlog (./include/linux/rcupdate.h:329 ./include/linux/rcupdate.h:781 net/core/dev.c:6046) [ 4569.008968][ C0] process_backlog (./include/linux/rcupdate.h:810 net/core/dev.c:6048) [ 4569.009114][ C0] __napi_poll.constprop.0 (net/core/dev.c:6701) [ 4569.009260][ C0] net_rx_action (net/core/dev.c:6770 net/core/dev.c:6886) [ 4569.009405][ C0] ? __pfx_net_rx_action (net/core/dev.c:6850) [ 4569.009550][ C0] __do_softirq (kernel/softirq.c:554) [ 4569.009692][ C0] irq_exit_rcu (kernel/softirq.c:428 kernel/softirq.c:633 kernel/softirq.c:645) [ 4569.009800][ C0] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1043 arch/x86/kernel/apic/apic.c:1043) [ 4569.009943][ C0] [ 4569.010016][ C0] [ 4569.010089][ C0] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) [ 4569.010265][ C0] RIP: 0010:default_idle (./arch/x86/include/asm/irqflags.h:37 ./arch/x86/include/asm/irqflags.h:72 arch/x86/kernel/process.c:743) [ 4569.010416][ C0] 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 cc 32 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 cc 32 00 verw 0x32cce3(%rip) # 0x32cd0b 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 [ 4569.010917][ C0] RSP: 0018:ffffffffa6407e00 EFLAGS: 00000242 [ 4569.011096][ C0] RAX: 0000000002284989 RBX: 1ffffffff4c80fc2 RCX: ffffffffa5534e95 [ 4569.011309][ C0] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffffa2cac0e4 [ 4569.011546][ C0] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1005ec709c [ 4569.011763][ C0] R10: ffff88802f6384e3 R11: ffff88802f62d9b0 R12: 0000000000000000 [ 4569.011980][ C0] R13: ffffffffa6431000 R14: dffffc0000000000 R15: 0000000000014770 [ 4569.012210][ C0] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:147) [ 4569.012351][ C0] ? cpuidle_idle_call (kernel/sched/idle.c:192) [ 4569.012495][ C0] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) [ 4569.012638][ C0] cpuidle_idle_call (kernel/sched/idle.c:192) [ 4569.012781][ C0] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) [ 4569.012924][ C0] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) [ 4569.013066][ C0] do_idle (kernel/sched/idle.c:332) [ 4569.013191][ C0] cpu_startup_entry (kernel/sched/idle.c:429 (discriminator 1)) [ 4569.013332][ C0] rest_init (./include/linux/rcupdate.h:782 init/main.c:703) [ 4569.013439][ C0] start_kernel (init/main.c:1024 (discriminator 1)) [ 4569.013582][ C0] x86_64_start_reservations (arch/x86/kernel/head64.c:495) [ 4569.013725][ C0] x86_64_start_kernel (arch/x86/kernel/head64.c:437 (discriminator 17)) Finger prints: dump_stack_lvl:kasan_report:kasan_check_range:sock_def_write_space_wfree sock_def_write_space_wfree:sock_wfree:ip6_rcv_core:ipv6_rcv