[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 40.644542][ T26] audit: type=1800 audit(1546845619.375:25): pid=7803 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 40.682794][ T26] audit: type=1800 audit(1546845619.375:26): pid=7803 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 40.727638][ T26] audit: type=1800 audit(1546845619.375:27): pid=7803 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 res=0 [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.76' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 52.382729][ T7956] ------------[ cut here ]------------ [ 52.388240][ T7956] kernel BUG at net/core/skbuff.c:1459! [ 52.394452][ T7956] invalid opcode: 0000 [#1] PREEMPT SMP KASAN [ 52.400518][ T7956] CPU: 0 PID: 7956 Comm: syz-executor294 Not tainted 4.20.0-next-20190107 #6 [ 52.409292][ T7956] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 52.419367][ T7956] RIP: 0010:pskb_expand_head+0xbb0/0x1080 [ 52.425079][ T7956] Code: 8b b5 e0 fe ff ff 48 85 f6 0f 84 4d fe ff ff e8 d6 c5 67 fb 4d 8d 74 24 ff e9 3e fe ff ff e8 c7 c5 67 fb 0f 0b e8 c0 c5 67 fb <0f> 0b e8 b9 c5 67 fb 81 8d 10 ff ff ff 00 20 00 00 e9 0f f6 ff ff [ 52.444672][ T7956] RSP: 0018:ffff88808aa875e0 EFLAGS: 00010293 [ 52.450727][ T7956] RAX: ffff88808f240380 RBX: ffff8880908aebc0 RCX: ffffffff861a4218 [ 52.458689][ T7956] RDX: 0000000000000000 RSI: ffffffff861a4c50 RDI: 0000000000000005 [ 52.466669][ T7956] RBP: ffff88808aa87720 R08: ffff88808f240380 R09: ffffed1012115d93 [ 52.474628][ T7956] R10: ffffed1012115d92 R11: ffff8880908aec97 R12: ffff8880908aec7c [ 52.482590][ T7956] R13: 000000000000003f R14: dffffc0000000000 R15: 0000000000000000 [ 52.490568][ T7956] FS: 00007f215cb6a700(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 [ 52.499498][ T7956] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 52.506086][ T7956] CR2: 0000000020000300 CR3: 00000000a048f000 CR4: 00000000001406f0 [ 52.514047][ T7956] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 52.522006][ T7956] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 52.529969][ T7956] Call Trace: [ 52.533252][ T7956] ? lock_acquire+0x1db/0x570 [ 52.537928][ T7956] ? lock_downgrade+0x910/0x910 [ 52.542782][ T7956] ? skb_release_data+0x960/0x960 [ 52.547819][ T7956] ? lockdep_hardirqs_on+0x415/0x5d0 [ 52.553089][ T7956] __pskb_pull_tail+0x13a/0x1740 [ 52.558012][ T7956] ? _copy_to_iter+0x3a1/0x1400 [ 52.562849][ T7956] ? _raw_spin_unlock_irqrestore+0xa4/0xe0 [ 52.568655][ T7956] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 52.574926][ T7956] ? __skb_try_recv_datagram+0x448/0x5b0 [ 52.580545][ T7956] ? pskb_carve+0x1e20/0x1e20 [ 52.585207][ T7956] ? __check_object_size+0xa3/0x77a [ 52.590394][ T7956] ? iov_iter_copy_from_user_atomic+0xff0/0xff0 [ 52.596626][ T7956] ? usercopy_warn+0x110/0x110 [ 52.601378][ T7956] ? ___might_sleep+0x1e7/0x310 [ 52.606218][ T7956] ? arch_local_save_flags+0x50/0x50 [ 52.611502][ T7956] ? __fget+0x473/0x710 [ 52.615645][ T7956] ip6_datagram_recv_specific_ctl+0x1751/0x1bd0 [ 52.621894][ T7956] ? ip6_datagram_recv_common_ctl+0x5e0/0x5e0 [ 52.627961][ T7956] ? skb_kill_datagram+0x130/0x130 [ 52.633061][ T7956] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 52.639287][ T7956] ? ip6_datagram_recv_common_ctl+0x37b/0x5e0 [ 52.645349][ T7956] ? skb_copy_datagram_iter+0x10d/0x490 [ 52.650883][ T7956] ? ipv6_recv_rxpmtu+0x920/0x920 [ 52.655915][ T7956] ? skb_copy_and_hash_datagram_iter+0x50/0x50 [ 52.662075][ T7956] ip6_datagram_recv_ctl+0x34/0x40 [ 52.667177][ T7956] rawv6_recvmsg+0xc43/0xe90 [ 52.671754][ T7956] ? aa_sk_perm+0x234/0x8e0 [ 52.676239][ T7956] ? raw6_seq_show+0x2a0/0x2a0 [ 52.680983][ T7956] ? __fget_light+0x2db/0x420 [ 52.685734][ T7956] sock_common_recvmsg+0x13f/0x2b0 [ 52.690834][ T7956] ? compat_sock_common_getsockopt+0x150/0x150 [ 52.696974][ T7956] ? apparmor_socket_recvmsg+0x2a/0x30 [ 52.702417][ T7956] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 52.708644][ T7956] ? security_socket_recvmsg+0x9b/0xd0 [ 52.714086][ T7956] ? compat_sock_common_getsockopt+0x150/0x150 [ 52.720241][ T7956] sock_recvmsg+0xd0/0x110 [ 52.724644][ T7956] __sys_recvfrom+0x30b/0x5d0 [ 52.729307][ T7956] ? __ia32_sys_send+0x100/0x100 [ 52.734230][ T7956] ? __sys_sendmsg+0x1a3/0x270 [ 52.738982][ T7956] ? do_syscall_64+0x8c/0x800 [ 52.743644][ T7956] ? do_syscall_64+0x8c/0x800 [ 52.748302][ T7956] ? lockdep_hardirqs_on+0x415/0x5d0 [ 52.753566][ T7956] ? trace_hardirqs_on+0xbd/0x310 [ 52.758584][ T7956] ? do_futex+0x2910/0x2910 [ 52.763068][ T7956] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 52.769145][ T7956] ? trace_hardirqs_off_caller+0x300/0x300 [ 52.774937][ T7956] __x64_sys_recvfrom+0xe1/0x1a0 [ 52.779863][ T7956] do_syscall_64+0x1a3/0x800 [ 52.784437][ T7956] ? syscall_return_slowpath+0x5f0/0x5f0 [ 52.790057][ T7956] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 52.795777][ T7956] ? __switch_to_asm+0x34/0x70 [ 52.800526][ T7956] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 52.806062][ T7956] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 52.811942][ T7956] RIP: 0033:0x445809 [ 52.815820][ T7956] Code: e8 6c b6 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 2b 12 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 52.835416][ T7956] RSP: 002b:00007f215cb69da8 EFLAGS: 00000216 ORIG_RAX: 000000000000002d [ 52.843821][ T7956] RAX: ffffffffffffffda RBX: 00000000006dac38 RCX: 0000000000445809 [ 52.851783][ T7956] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004 [ 52.859742][ T7956] RBP: 00000000006dac30 R08: 0000000000000000 R09: 0000000000000000 [ 52.867700][ T7956] R10: 0000000000000002 R11: 0000000000000216 R12: 00000000006dac3c [ 52.875661][ T7956] R13: 00007ffea992c08f R14: 00007f215cb6a9c0 R15: 00000000006dad2c [ 52.883626][ T7956] Modules linked in: [ 52.888311][ T7956] ---[ end trace a8c726ec31a34d2c ]--- [ 52.893784][ T7956] RIP: 0010:pskb_expand_head+0xbb0/0x1080 [ 52.899568][ T7956] Code: 8b b5 e0 fe ff ff 48 85 f6 0f 84 4d fe ff ff e8 d6 c5 67 fb 4d 8d 74 24 ff e9 3e fe ff ff e8 c7 c5 67 fb 0f 0b e8 c0 c5 67 fb <0f> 0b e8 b9 c5 67 fb 81 8d 10 ff ff ff 00 20 00 00 e9 0f f6 ff ff [ 52.919222][ T7956] RSP: 0018:ffff88808aa875e0 EFLAGS: 00010293 [ 52.925281][ T7956] RAX: ffff88808f240380 RBX: ffff8880908aebc0 RCX: ffffffff861a4218 [ 52.933339][ T7956] RDX: 0000000000000000 RSI: ffffffff861a4c50 RDI: 0000000000000005 [ 52.941375][ T7956] RBP: ffff88808aa87720 R08: ffff88808f240380 R09: ffffed1012115d93 [ 52.949399][ T7956] R10: ffffed1012115d92 R11: ffff8880908aec97 R12: ffff8880908aec7c [ 52.957424][ T7956] R13: 000000000000003f R14: dffffc0000000000 R15: 0000000000000000 [ 52.965404][ T7956] FS: 00007f215cb6a700(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 [ 52.974409][ T7956] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 52.981017][ T7956] CR2: 0000000020000300 CR3: 00000000a048f000 CR4: 00000000001406f0 [ 52.989028][ T7956] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 52.997008][ T7956] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 53.005040][ T7956] Kernel panic - not syncing: Fatal exception [ 53.012168][ T7956] Kernel Offset: disabled [ 53.016496][ T7956] Rebooting in 86400 seconds..