skbuff: skb_over_panic: text:ffffffff830a6c8f len:184 put:172 head:ffff888154dc6c00 data:ffff888154dc6c00 tail:0xb8 end:0x80 dev: ------------[ cut here ]------------ kernel BUG at net/core/skbuff.c:110! invalid opcode: 0000 [#1] PREEMPT SMP KASAN CPU: 1 PID: 19935 Comm: dhcpcd-run-hook Not tainted 5.10.77-syzkaller-01258-g76698ea35fd3 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:skb_panic+0x14f/0x160 net/core/skbuff.c:106 Code: 87 85 48 8b 75 c0 48 8b 55 b8 8b 4d d4 44 8b 45 d0 4c 8b 4d c8 b8 00 00 00 00 53 41 56 41 55 41 54 e8 8c 4d 89 fd 48 83 c4 20 <0f> 0b 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 55 48 89 e5 41 RSP: 0018:ffffc9000015fee8 EFLAGS: 00010286 RAX: 0000000000000087 RBX: ffffffff85873b60 RCX: de73a18a01958400 RDX: 0000000000000704 RSI: 0000000000000704 RDI: 0000000000000000 RBP: ffffc9000015ff30 R08: ffffffff81545288 R09: ffffed103ee295d8 R10: ffffed103ee295d8 R11: 0000000000000000 R12: ffff888154dc6c00 R13: 00000000000000b8 R14: 0000000000000080 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fdd0b5ae9ee CR3: 0000000155c47000 CR4: 00000000003506a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: skb_over_panic+0x2c/0x30 net/core/skbuff.c:115 skb_put+0x205/0x210 net/core/skbuff.c:1877 skb_put_zero include/linux/skbuff.h:2270 [inline] cdc_ncm_ndp16 drivers/net/usb/cdc_ncm.c:1116 [inline] cdc_ncm_fill_tx_frame+0x127f/0x3d50 drivers/net/usb/cdc_ncm.c:1293 cdc_ncm_tx_fixup+0x98/0xf0 drivers/net/usb/cdc_ncm.c:1514 usbnet_start_xmit+0x111/0x1a60 drivers/net/usb/usbnet.c:1338 __netdev_start_xmit include/linux/netdevice.h:4823 [inline] netdev_start_xmit include/linux/netdevice.h:4837 [inline] xmit_one+0x16a/0x480 net/core/dev.c:3589 dev_hard_start_xmit+0xad/0x1c0 net/core/dev.c:3605 sch_direct_xmit+0x28f/0x9b0 net/sched/sch_generic.c:336 qdisc_restart net/sched/sch_generic.c:401 [inline] __qdisc_run+0x245/0x3e0 net/sched/sch_generic.c:409 qdisc_run include/net/pkt_sched.h:127 [inline] __dev_xmit_skb net/core/dev.c:3781 [inline] __dev_queue_xmit+0xe7e/0x2ac0 net/core/dev.c:4135 dev_queue_xmit+0x17/0x20 net/core/dev.c:4200 neigh_resolve_output+0x693/0x740 net/core/neighbour.c:1497 neigh_output include/net/neighbour.h:518 [inline] ip6_finish_output2+0x109c/0x1930 net/ipv6/ip6_output.c:145 __ip6_finish_output+0x610/0x7b0 net/ipv6/ip6_output.c:210 ip6_finish_output+0x3f/0x1e0 net/ipv6/ip6_output.c:220 NF_HOOK_COND include/linux/netfilter.h:293 [inline] ip6_output+0x211/0x4c0 net/ipv6/ip6_output.c:243 dst_output include/net/dst.h:443 [inline] NF_HOOK include/linux/netfilter.h:304 [inline] mld_sendpack+0x5fc/0xb20 net/ipv6/mcast.c:1676 mld_send_cr net/ipv6/mcast.c:1972 [inline] mld_ifc_timer_expire+0x85b/0xc50 net/ipv6/mcast.c:2471 call_timer_fn+0x35/0x280 kernel/time/timer.c:1420 expire_timers+0x21f/0x3b0 kernel/time/timer.c:1465 __run_timers+0x548/0x680 kernel/time/timer.c:1756 run_timer_softirq+0x69/0xf0 kernel/time/timer.c:1769 __do_softirq+0x27e/0x598 kernel/softirq.c:305 asm_call_irq_on_stack+0xf/0x20 __run_on_irqstack arch/x86/include/asm/irq_stack.h:26 [inline] run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:77 [inline] do_softirq_own_stack+0x60/0x80 arch/x86/kernel/irq_64.c:77 invoke_softirq kernel/softirq.c:402 [inline] __irq_exit_rcu+0x128/0x150 kernel/softirq.c:432 irq_exit_rcu+0x9/0x10 kernel/softirq.c:444 sysvec_apic_timer_interrupt+0xbf/0xe0 arch/x86/kernel/apic/apic.c:1095 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:635 RIP: 0010:bytes_is_nonzero mm/kasan/generic.c:84 [inline] RIP: 0010:memory_is_nonzero mm/kasan/generic.c:102 [inline] RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:128 [inline] RIP: 0010:memory_is_poisoned mm/kasan/generic.c:159 [inline] RIP: 0010:check_region_inline mm/kasan/generic.c:177 [inline] RIP: 0010:kasan_check_range+0x7d/0x2f0 mm/kasan/generic.c:186 Code: ea 03 49 bd 01 00 00 00 00 fc ff df 4d 01 ea 4d 89 d6 4d 29 ce 49 83 fe 10 7f 2c 4d 85 f6 0f 84 aa 01 00 00 4c 89 cb 4c 29 d3 <0f> 1f 00 45 0f b6 19 45 84 db 0f 85 f4 01 00 00 49 ff c1 48 ff c3 RSP: 0018:ffffc90010d0f3f8 EFLAGS: 00000297 RAX: 8000000157db7001 RBX: ffffffffffffffff RCX: ffffffff819c1265 RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff888155eb13c0 RBP: ffffc90010d0f420 R08: dffffc0000000000 R09: ffffed102abd6278 R10: ffffed102abd6279 R11: 0000000000000004 R12: 1ffff1102abd6278 R13: dffffc0000000001 R14: 0000000000000001 R15: dffffc0000000000 __kasan_check_read+0x11/0x20 mm/kasan/shadow.c:31 instrument_atomic_read include/linux/instrumented.h:71 [inline] test_bit include/asm-generic/bitops/instrumented-non-atomic.h:134 [inline] test_ti_thread_flag include/linux/thread_info.h:97 [inline] need_resched include/linux/sched.h:1949 [inline] zap_pte_range mm/memory.c:1270 [inline] zap_pmd_range mm/memory.c:1419 [inline] zap_pud_range mm/memory.c:1448 [inline] zap_p4d_range mm/memory.c:1469 [inline] unmap_page_range+0xaf5/0x1f70 mm/memory.c:1491 unmap_single_vma mm/memory.c:1537 [inline] unmap_vmas+0x3a4/0x520 mm/memory.c:1569 exit_mmap+0x2c8/0x570 mm/mmap.c:3324 __mmput+0x95/0x2c0 kernel/fork.c:1128 mmput+0x4b/0x50 kernel/fork.c:1149 exec_mmap fs/exec.c:1033 [inline] begin_new_exec+0xbb9/0x2360 fs/exec.c:1280 load_elf_binary+0x876/0x4e60 fs/binfmt_elf.c:998 search_binary_handler fs/exec.c:1707 [inline] exec_binprm+0x2a9/0xab0 fs/exec.c:1748 bprm_execve+0x6ae/0xa70 fs/exec.c:1824 do_execveat_common+0x46f/0x5d0 fs/exec.c:1919 do_execve fs/exec.c:1987 [inline] __do_sys_execve fs/exec.c:2063 [inline] __se_sys_execve fs/exec.c:2058 [inline] __x64_sys_execve+0x92/0xb0 fs/exec.c:2058 do_syscall_64+0x31/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7fdd0b4fb337 Code: Unable to access opcode bytes at RIP 0x7fdd0b4fb30d. RSP: 002b:00007ffc3a953c28 EFLAGS: 00000246 ORIG_RAX: 000000000000003b RAX: ffffffffffffffda RBX: 000056269923fc80 RCX: 00007fdd0b4fb337 RDX: 000056269923fca8 RSI: 000056269923fc80 RDI: 000056269923fd38 RBP: 000056269923fd38 R08: 000056269923fd3d R09: 00007fdd0b6ed000 R10: 00007fdd0b391800 R11: 0000000000000246 R12: 000056269923fca8 R13: 00007fdd0b6a0ff4 R14: 000056269923fca8 R15: 0000000000000000 Modules linked in: ---[ end trace fac940a4d9af42ee ]--- RIP: 0010:skb_panic+0x14f/0x160 net/core/skbuff.c:106 Code: 87 85 48 8b 75 c0 48 8b 55 b8 8b 4d d4 44 8b 45 d0 4c 8b 4d c8 b8 00 00 00 00 53 41 56 41 55 41 54 e8 8c 4d 89 fd 48 83 c4 20 <0f> 0b 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 55 48 89 e5 41 RSP: 0018:ffffc9000015fee8 EFLAGS: 00010286 RAX: 0000000000000087 RBX: ffffffff85873b60 RCX: de73a18a01958400 RDX: 0000000000000704 RSI: 0000000000000704 RDI: 0000000000000000 RBP: ffffc9000015ff30 R08: ffffffff81545288 R09: ffffed103ee295d8 R10: ffffed103ee295d8 R11: 0000000000000000 R12: ffff888154dc6c00 R13: 00000000000000b8 R14: 0000000000000080 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fdd0b4fb30d CR3: 0000000155c47000 CR4: 00000000003506a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess), 2 bytes skipped: 0: 49 bd 01 00 00 00 00 movabs $0xdffffc0000000001,%r13 7: fc ff df a: 4d 01 ea add %r13,%r10 d: 4d 89 d6 mov %r10,%r14 10: 4d 29 ce sub %r9,%r14 13: 49 83 fe 10 cmp $0x10,%r14 17: 7f 2c jg 0x45 19: 4d 85 f6 test %r14,%r14 1c: 0f 84 aa 01 00 00 je 0x1cc 22: 4c 89 cb mov %r9,%rbx 25: 4c 29 d3 sub %r10,%rbx * 28: 0f 1f 00 nopl (%rax) <-- trapping instruction 2b: 45 0f b6 19 movzbl (%r9),%r11d 2f: 45 84 db test %r11b,%r11b 32: 0f 85 f4 01 00 00 jne 0x22c 38: 49 ff c1 inc %r9 3b: 48 ff c3 inc %rbx