[ OK ] Started Serial Getty on ttyS0. [ OK ] Reached target Login Prompts. [ OK ] Started OpenBSD Secure Shell server. [ 34.662497][ T7005] bash (7005) used greatest stack depth: 24928 bytes left [ 34.695766][ T6947] sshd (6947) used greatest stack depth: 24592 bytes left Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.55' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 41.980892][ T7041] general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN [ 41.992664][ T7041] KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] [ 42.001254][ T7041] CPU: 0 PID: 7041 Comm: syz-executor909 Not tainted 5.7.0-rc6-syzkaller #0 [ 42.009900][ T7041] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 42.019930][ T7041] RIP: 0010:fq_codel_enqueue+0xbfe/0x13b0 [ 42.025642][ T7041] Code: 89 34 24 4c 89 fb 48 8b 44 24 28 42 80 3c 38 00 48 8b 6c 24 60 74 08 48 89 ef e8 7d 1f 27 fb 4c 8b 6d 00 4d 89 ef 49 c1 ef 03 <41> 80 3c 1f 00 74 08 4c 89 ef e8 63 1f 27 fb 4d 8b 75 00 48 8b 44 [ 42.045214][ T7041] RSP: 0018:ffffc90002c2f818 EFLAGS: 00010246 [ 42.051430][ T7041] RAX: 1ffff11010e2c000 RBX: dffffc0000000000 RCX: ffff888087160000 [ 42.059394][ T7041] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 [ 42.067336][ T7041] RBP: ffff888087160000 R08: ffffffff868a4ee8 R09: fffffbfff162a2b6 [ 42.076143][ T7041] R10: fffffbfff162a2b6 R11: 0000000000000000 R12: 0000000000000000 [ 42.084115][ T7041] R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000000 [ 42.092064][ T7041] FS: 00000000008b3880(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 [ 42.101007][ T7041] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 42.108023][ T7041] CR2: 0000000020000100 CR3: 0000000096fd4000 CR4: 00000000001406f0 [ 42.116374][ T7041] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 42.124334][ T7041] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 42.132299][ T7041] Call Trace: [ 42.135576][ T7041] __dev_queue_xmit+0x1032/0x28a0 [ 42.140587][ T7041] packet_sendmsg+0x4b60/0x6510 [ 42.145413][ T7041] ? __lock_acquire+0x116c/0x2c30 [ 42.150415][ T7041] ? smack_socket_sendmsg+0x100/0x450 [ 42.155763][ T7041] ? tomoyo_socket_sendmsg_permission+0x217/0x320 [ 42.162158][ T7041] ? compat_packet_setsockopt+0x160/0x160 [ 42.167846][ T7041] sock_write_iter+0x2b4/0x3d0 [ 42.172584][ T7041] __vfs_write+0x54c/0x710 [ 42.176980][ T7041] vfs_write+0x274/0x580 [ 42.181190][ T7041] ksys_write+0x11b/0x220 [ 42.185501][ T7041] ? do_syscall_64+0x19/0x1b0 [ 42.190323][ T7041] do_syscall_64+0xf3/0x1b0 [ 42.194988][ T7041] entry_SYSCALL_64_after_hwframe+0x49/0xb3 [ 42.200844][ T7041] RIP: 0033:0x440599 [ 42.204706][ T7041] Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 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 fb 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 42.224295][ T7041] RSP: 002b:00007ffc64bb7248 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 42.232856][ T7041] RAX: ffffffffffffffda RBX: 00000000004a173e RCX: 0000000000440599 [ 42.240799][ T7041] RDX: 000000000000006c RSI: 00000000200003c0 RDI: 0000000000000005 [ 42.248831][ T7041] RBP: 54c6c2ff093a6d32 R08: 00000000004002c8 R09: 00000000004002c8 [ 42.256884][ T7041] R10: 00000000004002c8 R11: 0000000000000246 R12: 0000000000010000 [ 42.264836][ T7041] R13: 0000000000401eb0 R14: 0000000000000000 R15: 0000000000000000 [ 42.272809][ T7041] Modules linked in: [ 42.276768][ T7041] ---[ end trace 15cf2f4364a7357d ]--- [ 42.282250][ T7041] RIP: 0010:fq_codel_enqueue+0xbfe/0x13b0 [ 42.288088][ T7041] Code: 89 34 24 4c 89 fb 48 8b 44 24 28 42 80 3c 38 00 48 8b 6c 24 60 74 08 48 89 ef e8 7d 1f 27 fb 4c 8b 6d 00 4d 89 ef 49 c1 ef 03 <41> 80 3c 1f 00 74 08 4c 89 ef e8 63 1f 27 fb 4d 8b 75 00 48 8b 44 [ 42.307978][ T7041] RSP: 0018:ffffc90002c2f818 EFLAGS: 00010246 [ 42.314083][ T7041] RAX: 1ffff11010e2c000 RBX: dffffc0000000000 RCX: ffff888087160000 [ 42.322088][ T7041] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 [ 42.330134][ T7041] RBP: ffff888087160000 R08: ffffffff868a4ee8 R09: fffffbfff162a2b6 [ 42.338124][ T7041] R10: fffffbfff162a2b6 R11: 0000000000000000 R12: 0000000000000000 [ 42.347062][ T7041] R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000000 [ 42.355078][ T7041] FS: 00000000008b3880(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 [ 42.364058][ T7041] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 42.370864][ T7041] CR2: 0000000020000100 CR3: 0000000096fd4000 CR4: 00000000001406f0 [ 42.378863][ T7041] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 42.386878][ T7041] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 42.394898][ T7041] Kernel panic - not syncing: Fatal exception in interrupt [ 42.403186][ T7041] Kernel Offset: disabled [ 42.407515][ T7041] Rebooting in 86400 seconds..