[ OK ] Started Getty on tty2. [ OK ] Started Serial Getty on ttyS0. [ OK ] Started Getty on tty1. [ OK ] Started OpenBSD Secure Shell server. [ OK ] Started getty on tty2-tty6 if dbus and logind are not available. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.10.26' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 68.559196][ T8501] general protection fault, probably for non-canonical address 0xdffffc0000000045: 0000 [#1] PREEMPT SMP KASAN [ 68.570956][ T8501] KASAN: null-ptr-deref in range [0x0000000000000228-0x000000000000022f] [ 68.579364][ T8501] CPU: 1 PID: 8501 Comm: syz-executor808 Not tainted 5.10.0-rc6-next-20201201-syzkaller #0 [ 68.589332][ T8501] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 68.599384][ T8501] RIP: 0010:xsk_recvmsg+0x79/0x640 [ 68.604488][ T8501] Code: 03 80 3c 02 00 0f 85 5a 05 00 00 48 8b 9d c8 04 00 00 48 b8 00 00 00 00 00 fc ff df 48 8d bb 28 02 00 00 48 89 fa 48 c1 ea 03 <0f> b6 04 02 84 c0 74 08 3c 03 0f 8e e9 04 00 00 8b 9b 28 02 00 00 [ 68.624076][ T8501] RSP: 0018:ffffc90000f6f998 EFLAGS: 00010202 [ 68.630118][ T8501] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000 [ 68.638085][ T8501] RDX: 0000000000000045 RSI: ffffffff88ae7ff5 RDI: 0000000000000228 [ 68.646050][ T8501] RBP: ffff888014f58000 R08: 0000000000000000 R09: 0000000000000000 [ 68.654006][ T8501] R10: ffffffff86f05533 R11: 0000000000000000 R12: 0000000000000000 [ 68.661972][ T8501] R13: 0000000000000000 R14: ffffc90000f6fde8 R15: 0000000000000000 [ 68.669936][ T8501] FS: 000000000089f880(0000) GS:ffff8880b9f00000(0000) knlGS:0000000000000000 [ 68.678855][ T8501] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 68.685431][ T8501] CR2: 00000000200052c0 CR3: 0000000011b3e000 CR4: 00000000001506e0 [ 68.693396][ T8501] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 68.701359][ T8501] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 68.709319][ T8501] Call Trace: [ 68.712606][ T8501] ? xsk_wakeup+0x250/0x250 [ 68.717103][ T8501] ____sys_recvmsg+0x2c4/0x600 [ 68.721860][ T8501] ? move_addr_to_kernel.part.0+0x110/0x110 [ 68.727769][ T8501] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 68.734005][ T8501] ? __import_iovec+0x293/0x500 [ 68.738848][ T8501] ? import_iovec+0x10c/0x150 [ 68.743520][ T8501] ___sys_recvmsg+0x127/0x200 [ 68.748188][ T8501] ? __copy_msghdr_from_user+0x4b0/0x4b0 [ 68.753812][ T8501] ? lockdep_hardirqs_on_prepare+0x400/0x400 [ 68.759785][ T8501] ? lock_chain_count+0x20/0x20 [ 68.764630][ T8501] ? find_held_lock+0x2d/0x110 [ 68.769391][ T8501] ? do_huge_pmd_anonymous_page+0x12b9/0x2180 [ 68.775454][ T8501] ? lock_downgrade+0x6d0/0x6d0 [ 68.780295][ T8501] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 68.786526][ T8501] ? __fget_light+0x215/0x280 [ 68.791194][ T8501] ? __sanitizer_cov_trace_const_cmp8+0x1d/0x70 [ 68.797427][ T8501] do_recvmmsg+0x24d/0x6c0 [ 68.801836][ T8501] ? ___sys_recvmsg+0x200/0x200 [ 68.806678][ T8501] ? __sanitizer_cov_trace_const_cmp1+0x22/0x80 [ 68.812913][ T8501] ? find_held_lock+0x2d/0x110 [ 68.817693][ T8501] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 68.824017][ T8501] ? vmacache_update+0xce/0x140 [ 68.828862][ T8501] __x64_sys_recvmmsg+0x20b/0x260 [ 68.833880][ T8501] ? __do_sys_socketcall+0x590/0x590 [ 68.839167][ T8501] ? syscall_enter_from_user_mode+0x1d/0x50 [ 68.845071][ T8501] do_syscall_64+0x2d/0x70 [ 68.849500][ T8501] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 68.855386][ T8501] RIP: 0033:0x440269 [ 68.859275][ T8501] 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 7b 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 68.878896][ T8501] RSP: 002b:00007ffc73c8eee8 EFLAGS: 00000246 ORIG_RAX: 000000000000012b [ 68.887310][ T8501] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440269 [ 68.895273][ T8501] RDX: 0000000000000001 RSI: 00000000200052c0 RDI: 0000000000000003 [ 68.903254][ T8501] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 68.911212][ T8501] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401a70 [ 68.919170][ T8501] R13: 0000000000401b00 R14: 0000000000000000 R15: 0000000000000000 [ 68.927134][ T8501] Modules linked in: [ 68.931650][ T8501] ---[ end trace 43ecb53be95d8edd ]--- [ 68.937963][ T8501] RIP: 0010:xsk_recvmsg+0x79/0x640 [ 68.943139][ T8501] Code: 03 80 3c 02 00 0f 85 5a 05 00 00 48 8b 9d c8 04 00 00 48 b8 00 00 00 00 00 fc ff df 48 8d bb 28 02 00 00 48 89 fa 48 c1 ea 03 <0f> b6 04 02 84 c0 74 08 3c 03 0f 8e e9 04 00 00 8b 9b 28 02 00 00 [ 68.962925][ T8501] RSP: 0018:ffffc90000f6f998 EFLAGS: 00010202 [ 68.968993][ T8501] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000 [ 68.977001][ T8501] RDX: 0000000000000045 RSI: ffffffff88ae7ff5 RDI: 0000000000000228 [ 68.985159][ T8501] RBP: ffff888014f58000 R08: 0000000000000000 R09: 0000000000000000 [ 68.993185][ T8501] R10: ffffffff86f05533 R11: 0000000000000000 R12: 0000000000000000 [ 69.001177][ T8501] R13: 0000000000000000 R14: ffffc90000f6fde8 R15: 0000000000000000 [ 69.009387][ T8501] FS: 000000000089f880(0000) GS:ffff8880b9e00000(0000) knlGS:0000000000000000 [ 69.018387][ T8501] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 69.025017][ T8501] CR2: 00007efe880400b8 CR3: 0000000011b3e000 CR4: 00000000001506f0 [ 69.033092][ T8501] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 69.041081][ T8501] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 69.049291][ T8501] Kernel panic - not syncing: Fatal exception [ 69.055793][ T8501] Kernel Offset: disabled [ 69.060108][ T8501] Rebooting in 86400 seconds..