[ OK ] Started Getty on tty3. [ OK ] Started Getty on tty2. [ OK ] Started Serial Getty on ttyS0. [ OK ] Started Getty on tty1. [ OK ] Started getty on tty2-tty6 if dbus and logind are not available. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.19' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 143.016618][ T8500] ===================================================== [ 143.023760][ T8500] BUG: KMSAN: uninit-value in ppp_async_push+0xbc5/0x2120 [ 143.030881][ T8500] CPU: 1 PID: 8500 Comm: syz-executor351 Not tainted 5.9.0-rc4-syzkaller #0 [ 143.039535][ T8500] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 143.049591][ T8500] Call Trace: [ 143.053019][ T8500] dump_stack+0x21c/0x280 [ 143.057346][ T8500] kmsan_report+0xf7/0x1e0 [ 143.061765][ T8500] __msan_warning+0x58/0xa0 [ 143.066430][ T8500] ppp_async_push+0xbc5/0x2120 [ 143.071193][ T8500] ? kmsan_get_metadata+0x116/0x180 [ 143.076392][ T8500] ? kmsan_set_origin_checked+0x95/0xf0 [ 143.081927][ T8500] ? kmsan_get_metadata+0x116/0x180 [ 143.087119][ T8500] ppp_async_send+0x144/0x1e0 [ 143.091791][ T8500] ? async_lcp_peek+0xd30/0xd30 [ 143.096652][ T8500] __ppp_channel_push+0x1a7/0x3b0 [ 143.101669][ T8500] ppp_write+0x785/0x810 [ 143.105921][ T8500] ? ppp_read+0xd50/0xd50 [ 143.110265][ T8500] vfs_write+0x69e/0x1860 [ 143.114586][ T8500] ? __msan_poison_alloca+0xf0/0x120 [ 143.119872][ T8500] ? kmsan_get_metadata+0x116/0x180 [ 143.125085][ T8500] ksys_write+0x275/0x500 [ 143.130557][ T8500] __se_sys_write+0x92/0xb0 [ 143.135067][ T8500] __x64_sys_write+0x4a/0x70 [ 143.139645][ T8500] do_syscall_64+0x9f/0x140 [ 143.144160][ T8500] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 143.150047][ T8500] RIP: 0033:0x441459 [ 143.153949][ T8500] Code: e8 fc ab 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 1b 09 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 143.173559][ T8500] RSP: 002b:00007fff40a04248 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 143.182005][ T8500] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441459 [ 143.189970][ T8500] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005 [ 143.197929][ T8500] RBP: 00000000006cb018 R08: 00000000004002c8 R09: 00000000004002c8 [ 143.205890][ T8500] R10: 00000000004002c8 R11: 0000000000000246 R12: 0000000000402200 [ 143.213864][ T8500] R13: 0000000000402290 R14: 0000000000000000 R15: 0000000000000000 [ 143.221843][ T8500] [ 143.224161][ T8500] Uninit was created at: [ 143.228405][ T8500] kmsan_internal_poison_shadow+0x66/0xd0 [ 143.234115][ T8500] kmsan_slab_alloc+0x8a/0xe0 [ 143.238788][ T8500] __kmalloc_node_track_caller+0x9aa/0x12f0 [ 143.244669][ T8500] __alloc_skb+0x35f/0xb30 [ 143.249091][ T8500] ppp_write+0x11f/0x810 [ 143.253330][ T8500] vfs_write+0x69e/0x1860 [ 143.257643][ T8500] ksys_write+0x275/0x500 [ 143.261967][ T8500] __se_sys_write+0x92/0xb0 [ 143.266452][ T8500] __x64_sys_write+0x4a/0x70 [ 143.271025][ T8500] do_syscall_64+0x9f/0x140 [ 143.275510][ T8500] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 143.281374][ T8500] ===================================================== [ 143.288283][ T8500] Disabling lock debugging due to kernel taint [ 143.294424][ T8500] Kernel panic - not syncing: panic_on_warn set ... [ 143.301011][ T8500] CPU: 1 PID: 8500 Comm: syz-executor351 Tainted: G B 5.9.0-rc4-syzkaller #0 [ 143.311051][ T8500] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 143.321092][ T8500] Call Trace: [ 143.324392][ T8500] dump_stack+0x21c/0x280 [ 143.328715][ T8500] panic+0x4d7/0xef7 [ 143.332602][ T8500] ? add_taint+0x17c/0x210 [ 143.337005][ T8500] kmsan_report+0x1df/0x1e0 [ 143.341495][ T8500] __msan_warning+0x58/0xa0 [ 143.345985][ T8500] ppp_async_push+0xbc5/0x2120 [ 143.350857][ T8500] ? kmsan_get_metadata+0x116/0x180 [ 143.356041][ T8500] ? kmsan_set_origin_checked+0x95/0xf0 [ 143.361598][ T8500] ? kmsan_get_metadata+0x116/0x180 [ 143.366790][ T8500] ppp_async_send+0x144/0x1e0 [ 143.371488][ T8500] ? async_lcp_peek+0xd30/0xd30 [ 143.376359][ T8500] __ppp_channel_push+0x1a7/0x3b0 [ 143.381372][ T8500] ppp_write+0x785/0x810 [ 143.385621][ T8500] ? ppp_read+0xd50/0xd50 [ 143.389961][ T8500] vfs_write+0x69e/0x1860 [ 143.394282][ T8500] ? __msan_poison_alloca+0xf0/0x120 [ 143.399687][ T8500] ? kmsan_get_metadata+0x116/0x180 [ 143.404887][ T8500] ksys_write+0x275/0x500 [ 143.409244][ T8500] __se_sys_write+0x92/0xb0 [ 143.413736][ T8500] __x64_sys_write+0x4a/0x70 [ 143.418331][ T8500] do_syscall_64+0x9f/0x140 [ 143.422819][ T8500] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 143.428695][ T8500] RIP: 0033:0x441459 [ 143.432577][ T8500] Code: e8 fc ab 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 1b 09 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 143.452180][ T8500] RSP: 002b:00007fff40a04248 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 143.460577][ T8500] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441459 [ 143.468554][ T8500] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005 [ 143.476525][ T8500] RBP: 00000000006cb018 R08: 00000000004002c8 R09: 00000000004002c8 [ 143.484483][ T8500] R10: 00000000004002c8 R11: 0000000000000246 R12: 0000000000402200 [ 143.492460][ T8500] R13: 0000000000402290 R14: 0000000000000000 R15: 0000000000000000 [ 143.506523][ T8500] Kernel Offset: disabled [ 143.510851][ T8500] Rebooting in 86400 seconds..