====================================== | [ 4184.366463][ C3] ================================================================== | [ 4184.366711][ C3] 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) | [ 4184.366948][ C3] Read of size 8 at addr 0000000000000008 by task swapper/3/0 | [ 4184.367154][ C3] [ 4184.367462][ C3] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014 [ 4184.367783][ C3] Call Trace: [ 4184.367886][ C3] [ 4184.367957][ C3] dump_stack_lvl (lib/dump_stack.c:117) [ 4184.368110][ C3] kasan_report (mm/kasan/report.c:603) [ 4184.368221][ C3] ? 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) [ 4184.368471][ C3] kasan_check_range (mm/kasan/generic.c:183 mm/kasan/generic.c:189) [ 4184.368610][ C3] 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) [ 4184.368758][ C3] sock_wfree (./include/linux/rcupdate.h:810 net/core/sock.c:2471) [ 4184.368878][ C3] skb_release_head_state (net/core/skbuff.c:1162 (discriminator 3)) [ 4184.369014][ C3] consume_skb (net/core/skbuff.c:1174 net/core/skbuff.c:1189 net/core/skbuff.c:1405 net/core/skbuff.c:1399) [ 4184.369137][ C3] dummy_xmit (drivers/net/dummy.c:66) [ 4184.369241][ C3] ? trace_net_dev_start_xmit (./include/trace/events/net.h:14 (discriminator 52)) [ 4184.369403][ C3] dev_hard_start_xmit (./include/linux/netdevice.h:4875 ./include/linux/netdevice.h:4889 net/core/dev.c:3563 net/core/dev.c:3579) [ 4184.369569][ C3] sch_direct_xmit (net/sched/sch_generic.c:343) [ 4184.369716][ C3] ? __pfx_sch_direct_xmit (net/sched/sch_generic.c:318) [ 4184.369854][ C3] __qdisc_run (net/sched/sch_generic.c:416) [ 4184.369989][ C3] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) [ 4184.370130][ C3] ? __pfx___qdisc_run (net/sched/sch_generic.c:412) [ 4184.370263][ C3] ? do_raw_spin_lock (./arch/x86/include/asm/atomic.h:115 ./include/linux/atomic/atomic-arch-fallback.h:2170 ./include/linux/atomic/atomic-instrumented.h:1302 ./include/asm-generic/qspinlock.h:111 kernel/locking/spinlock_debug.c:116) [ 4184.370407][ C3] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) [ 4184.370542][ C3] ? lock_acquire (kernel/locking/lockdep.c:5727) [ 4184.370683][ C3] ? net_tx_action (./include/linux/spinlock.h:352 net/core/dev.c:5250) [ 4184.370823][ C3] net_tx_action (./include/net/sch_generic.h:217 ./include/net/pkt_sched.h:128 ./include/net/pkt_sched.h:124 net/core/dev.c:5266) [ 4184.370960][ C3] __do_softirq (kernel/softirq.c:554) [ 4184.371100][ C3] irq_exit_rcu (kernel/softirq.c:428 kernel/softirq.c:633 kernel/softirq.c:645) [ 4184.371207][ C3] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1043 arch/x86/kernel/apic/apic.c:1043) [ 4184.371345][ C3] [ 4184.371418][ C3] [ 4184.371486][ C3] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) [ 4184.371681][ C3] RIP: 0010:default_idle (./arch/x86/include/asm/irqflags.h:37 ./arch/x86/include/asm/irqflags.h:72 arch/x86/kernel/process.c:743) [ 4184.371825][ C3] 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 [ 4184.372305][ C3] RSP: 0018:ffffc9000016fdf8 EFLAGS: 00000242 [ 4184.372485][ C3] RAX: 00000000039bb1b5 RBX: 1ffff9200002dfc1 RCX: ffffffff8af34e95 [ 4184.372729][ C3] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff886ac0e4 [ 4184.372936][ C3] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1006c3709c [ 4184.373138][ C3] R10: ffff8880361b84e3 R11: ffff8880361ad9b0 R12: 0000000000000000 [ 4184.373338][ C3] R13: ffff888001b98040 R14: dffffc0000000000 R15: 0000000000000000 [ 4184.373542][ C3] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:147) [ 4184.373680][ C3] ? cpuidle_idle_call (kernel/sched/idle.c:192) [ 4184.373821][ C3] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) [ 4184.373956][ C3] cpuidle_idle_call (kernel/sched/idle.c:192) [ 4184.374090][ C3] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) [ 4184.374227][ C3] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) [ 4184.374368][ C3] do_idle (kernel/sched/idle.c:332) [ 4184.374471][ C3] cpu_startup_entry (kernel/sched/idle.c:429 (discriminator 1)) [ 4184.374606][ C3] start_secondary (arch/x86/kernel/smpboot.c:201 arch/x86/kernel/smpboot.c:281) [ 4184.375032][ C3] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:231) [ 4184.375175][ C3] common_startup_64 (arch/x86/kernel/head_64.S:421) | [ 4184.375425][ C3] ================================================================== | [ 4184.375638][ C3] Disabling lock debugging due to kernel taint | [ 4184.375833][ C3] general protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] PREEMPT SMP KASAN NOPTI | [ 4184.376123][ C3] KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f] [ 4184.376564][ C3] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014 [ 4184.377020][ C3] 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) [ 4184.377196][ C3] 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 [ 4184.377669][ C3] RSP: 0018:ffffc90000288c30 EFLAGS: 00010202 [ 4184.377843][ C3] RAX: dffffc0000000000 RBX: ffff88800bc01140 RCX: ffffffff8859564a [ 4184.378040][ C3] RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffffffff8dafda00 [ 4184.378335][ C3] RBP: ffff88800bc011a0 R08: 0000000000000001 R09: fffffbfff1b5fb40 [ 4184.378540][ C3] R10: ffffffff8dafda07 R11: 205d334320202020 R12: 0000000000000000 [ 4184.378740][ C3] R13: ffff88800bc012c0 R14: 0000000000000008 R15: 0000000000000000 [ 4184.378943][ C3] FS: 0000000000000000(0000) GS:ffff888036180000(0000) knlGS:0000000000000000 [ 4184.379175][ C3] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 4184.379344][ C3] CR2: 00007f7dfd1f0ac0 CR3: 0000000032b38003 CR4: 0000000000770ef0 [ 4184.379629][ C3] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 4184.379833][ C3] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 4184.380040][ C3] PKRU: 55555554 [ 4184.380223][ C3] Call Trace: [ 4184.380326][ C3] [ 4184.380393][ C3] ? die_addr (arch/x86/kernel/dumpstack.c:421 arch/x86/kernel/dumpstack.c:460) [ 4184.380496][ C3] ? exc_general_protection (arch/x86/kernel/traps.c:702 arch/x86/kernel/traps.c:644) [ 4184.380638][ C3] ? asm_exc_general_protection (./arch/x86/include/asm/idtentry.h:617) [ 4184.380855][ C3] ? add_taint (./arch/x86/include/asm/bitops.h:60 ./include/asm-generic/bitops/instrumented-atomic.h:29 kernel/panic.c:555) [ 4184.380958][ C3] ? 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) [ 4184.381128][ C3] sock_wfree (./include/linux/rcupdate.h:810 net/core/sock.c:2471) [ 4184.381232][ C3] skb_release_head_state (net/core/skbuff.c:1162 (discriminator 3)) [ 4184.381368][ C3] consume_skb (net/core/skbuff.c:1174 net/core/skbuff.c:1189 net/core/skbuff.c:1405 net/core/skbuff.c:1399) [ 4184.381470][ C3] dummy_xmit (drivers/net/dummy.c:66) [ 4184.381571][ C3] ? trace_net_dev_start_xmit (./include/trace/events/net.h:14 (discriminator 52)) [ 4184.381716][ C3] dev_hard_start_xmit (./include/linux/netdevice.h:4875 ./include/linux/netdevice.h:4889 net/core/dev.c:3563 net/core/dev.c:3579) [ 4184.381852][ C3] sch_direct_xmit (net/sched/sch_generic.c:343) [ 4184.382062][ C3] ? __pfx_sch_direct_xmit (net/sched/sch_generic.c:318) [ 4184.382198][ C3] __qdisc_run (net/sched/sch_generic.c:416) [ 4184.382332][ C3] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) [ 4184.382466][ C3] ? __pfx___qdisc_run (net/sched/sch_generic.c:412) [ 4184.382600][ C3] ? do_raw_spin_lock (./arch/x86/include/asm/atomic.h:115 ./include/linux/atomic/atomic-arch-fallback.h:2170 ./include/linux/atomic/atomic-instrumented.h:1302 ./include/asm-generic/qspinlock.h:111 kernel/locking/spinlock_debug.c:116) [ 4184.382807][ C3] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) [ 4184.382945][ C3] ? lock_acquire (kernel/locking/lockdep.c:5727) [ 4184.383077][ C3] ? net_tx_action (./include/linux/spinlock.h:352 net/core/dev.c:5250) [ 4184.383209][ C3] net_tx_action (./include/net/sch_generic.h:217 ./include/net/pkt_sched.h:128 ./include/net/pkt_sched.h:124 net/core/dev.c:5266) [ 4184.383431][ C3] __do_softirq (kernel/softirq.c:554) [ 4184.383568][ C3] irq_exit_rcu (kernel/softirq.c:428 kernel/softirq.c:633 kernel/softirq.c:645) [ 4184.383667][ C3] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1043 arch/x86/kernel/apic/apic.c:1043) [ 4184.383802][ C3] [ 4184.383872][ C3] [ 4184.383941][ C3] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) [ 4184.384115][ C3] RIP: 0010:default_idle (./arch/x86/include/asm/irqflags.h:37 ./arch/x86/include/asm/irqflags.h:72 arch/x86/kernel/process.c:743) [ 4184.384256][ C3] 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 [ 4184.384822][ C3] RSP: 0018:ffffc9000016fdf8 EFLAGS: 00000242 [ 4184.385069][ C3] RAX: 00000000039bb1b5 RBX: 1ffff9200002dfc1 RCX: ffffffff8af34e95 [ 4184.385280][ C3] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff886ac0e4 [ 4184.385487][ C3] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1006c3709c [ 4184.385690][ C3] R10: ffff8880361b84e3 R11: ffff8880361ad9b0 R12: 0000000000000000 [ 4184.385982][ C3] R13: ffff888001b98040 R14: dffffc0000000000 R15: 0000000000000000 [ 4184.386186][ C3] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:147) [ 4184.386325][ C3] ? cpuidle_idle_call (kernel/sched/idle.c:192) [ 4184.386457][ C3] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) [ 4184.386590][ C3] cpuidle_idle_call (kernel/sched/idle.c:192) [ 4184.386714][ C3] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) [ 4184.386850][ C3] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) [ 4184.386991][ C3] do_idle (kernel/sched/idle.c:332) [ 4184.387169][ C3] cpu_startup_entry (kernel/sched/idle.c:429 (discriminator 1)) [ 4184.387304][ C3] start_secondary (arch/x86/kernel/smpboot.c:201 arch/x86/kernel/smpboot.c:281) [ 4184.387438][ C3] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:231) Finger prints: dump_stack_lvl:kasan_report:kasan_check_range:sock_def_write_space_wfree sock_def_write_space_wfree:sock_wfree:skb_release_head_state:consume_skb