[[0;32m OK [0m] Started getty on tty2-tty6 if dbus and logind are not available. [[0;32m OK [0m] Found device /dev/ttyS0. [[0;32m OK [0m] Started Serial Getty on ttyS0. [[0;32m OK [0m] Reached target Login Prompts. [[0;32m OK [0m] Started OpenBSD Secure Shell server. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.148' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 46.699736][ T6826] general protection fault, probably for non-canonical address 0xdffffc0000000003: 0000 [#1] PREEMPT SMP KASAN [ 46.711491][ T6826] KASAN: null-ptr-deref in range [0x0000000000000018-0x000000000000001f] [ 46.719870][ T6826] CPU: 1 PID: 6826 Comm: syz-executor142 Not tainted 5.9.0-rc4-syzkaller #0 [ 46.728512][ T6826] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 46.738544][ T6826] RIP: 0010:__lock_acquire+0x84/0x2ae0 [ 46.743973][ T6826] Code: ff df 8a 04 30 84 c0 0f 85 e3 16 00 00 83 3d 56 58 35 08 00 0f 84 0e 17 00 00 83 3d 25 c7 f5 07 00 74 2c 4c 89 e8 48 c1 e8 03 <80> 3c 30 00 74 12 4c 89 ef e8 3e d1 5a 00 48 be 00 00 00 00 00 fc [ 46.763559][ T6826] RSP: 0018:ffffc90004b9f850 EFLAGS: 00010006 [ 46.769615][ T6826] RAX: 0000000000000003 RBX: 0000000000000001 RCX: 0000000000000000 [ 46.777556][ T6826] RDX: 0000000000000000 RSI: dffffc0000000000 RDI: 0000000000000018 [ 46.785496][ T6826] RBP: ffffc90004b9f9a8 R08: 0000000000000001 R09: 0000000000000000 [ 46.793435][ T6826] R10: fffffbfff131e2e6 R11: 0000000000000000 R12: ffff8880937161c0 [ 46.801376][ T6826] R13: 0000000000000018 R14: 0000000000000000 R15: 0000000000000000 [ 46.809317][ T6826] FS: 0000000002638880(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 [ 46.818212][ T6826] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 46.824771][ T6826] CR2: 000000002100003f CR3: 00000000a49a2000 CR4: 00000000001506e0 [ 46.832712][ T6826] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 46.840651][ T6826] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 46.848589][ T6826] Call Trace: [ 46.851863][ T6826] ? lock_is_held_type+0xb3/0xe0 [ 46.856776][ T6826] ? rcu_read_lock_sched_held+0x2f/0xa0 [ 46.862289][ T6826] ? trace_lock_release+0x149/0x1a0 [ 46.867453][ T6826] ? __up_read+0x1f1/0x6f0 [ 46.871857][ T6826] ? lock_is_held_type+0xb3/0xe0 [ 46.876766][ T6826] lock_acquire+0x140/0x6f0 [ 46.881239][ T6826] ? madvise_cold_or_pageout_pte_range+0x52f/0x25c0 [ 46.887795][ T6826] _raw_spin_lock+0x2a/0x40 [ 46.892291][ T6826] ? madvise_cold_or_pageout_pte_range+0x52f/0x25c0 [ 46.898848][ T6826] madvise_cold_or_pageout_pte_range+0x52f/0x25c0 [ 46.905234][ T6826] ? __lock_acquire+0x110b/0x2ae0 [ 46.910245][ T6826] ? swapin_walk_pmd_entry+0x6a0/0x6a0 [ 46.915672][ T6826] __walk_page_range+0xe7b/0x1da0 [ 46.920669][ T6826] walk_page_range+0x2c3/0x5c0 [ 46.925404][ T6826] do_madvise+0x12d0/0x2090 [ 46.929890][ T6826] ? __mm_populate+0x365/0x3e0 [ 46.934624][ T6826] ? check_preemption_disabled+0x51/0x140 [ 46.940351][ T6826] ? syscall_enter_from_user_mode+0x24/0x1a0 [ 46.946302][ T6826] __x64_sys_madvise+0x76/0x80 [ 46.951035][ T6826] do_syscall_64+0x31/0x70 [ 46.955421][ T6826] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 46.961547][ T6826] RIP: 0033:0x4440e9 [ 46.965411][ T6826] 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 db d7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 [ 46.984990][ T6826] RSP: 002b:00007ffed62d6668 EFLAGS: 00000246 ORIG_RAX: 000000000000001c [ 46.993394][ T6826] RAX: ffffffffffffffda RBX: 00000000004002e0 RCX: 00000000004440e9 [ 47.001334][ T6826] RDX: 0000000000000015 RSI: 0000000000600003 RDI: 0000000020000000 [ 47.009296][ T6826] RBP: 00000000006ce018 R08: 0000000000000000 R09: 0000000000000000 [ 47.017335][ T6826] R10: 0000000000000004 R11: 0000000000000246 R12: 0000000000401d50 [ 47.025287][ T6826] R13: 0000000000401de0 R14: 0000000000000000 R15: 0000000000000000 [ 47.033239][ T6826] Modules linked in: [ 47.037113][ T6826] ---[ end trace 0453ba4a30f03f10 ]--- [ 47.042556][ T6826] RIP: 0010:__lock_acquire+0x84/0x2ae0 [ 47.047980][ T6826] Code: ff df 8a 04 30 84 c0 0f 85 e3 16 00 00 83 3d 56 58 35 08 00 0f 84 0e 17 00 00 83 3d 25 c7 f5 07 00 74 2c 4c 89 e8 48 c1 e8 03 <80> 3c 30 00 74 12 4c 89 ef e8 3e d1 5a 00 48 be 00 00 00 00 00 fc [ 47.067576][ T6826] RSP: 0018:ffffc90004b9f850 EFLAGS: 00010006 [ 47.073639][ T6826] RAX: 0000000000000003 RBX: 0000000000000001 RCX: 0000000000000000 [ 47.081590][ T6826] RDX: 0000000000000000 RSI: dffffc0000000000 RDI: 0000000000000018 [ 47.089529][ T6826] RBP: ffffc90004b9f9a8 R08: 0000000000000001 R09: 0000000000000000 [ 47.097469][ T6826] R10: fffffbfff131e2e6 R11: 0000000000000000 R12: ffff8880937161c0 [ 47.105413][ T6826] R13: 0000000000000018 R14: 0000000000000000 R15: 0000000000000000 [ 47.113360][ T6826] FS: 0000000002638880(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 [ 47.122289][ T6826] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 47.128854][ T6826] CR2: 000000002100003f CR3: 00000000a49a2000 CR4: 00000000001506e0 [ 47.136805][ T6826] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 47.144747][ T6826] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 47.152684][ T6826] Kernel panic - not syncing: Fatal exception [ 47.159859][ T6826] Kernel Offset: disabled [ 47.164166][ T6826] Rebooting in 86400 seconds..