[ OK ] Started OpenBSD Secure Shell server. [ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.1.29' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program syzkaller login: [ 83.631128][ T9204] ===================================================== [ 83.638208][ T9204] BUG: KMSAN: uninit-value in slhc_compress+0x2c5/0x2fb0 [ 83.645243][ T9204] CPU: 0 PID: 9204 Comm: syz-executor789 Not tainted 5.7.0-rc4-syzkaller #0 [ 83.654052][ T9204] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 83.664291][ T9204] Call Trace: [ 83.667597][ T9204] dump_stack+0x1c9/0x220 [ 83.671950][ T9204] kmsan_report+0xf7/0x1e0 [ 83.676389][ T9204] __msan_warning+0x58/0xa0 [ 83.680991][ T9204] slhc_compress+0x2c5/0x2fb0 [ 83.685829][ T9204] ? kmsan_get_shadow_origin_ptr+0x81/0xb0 [ 83.691664][ T9204] ? kmsan_get_shadow_origin_ptr+0x81/0xb0 [ 83.697496][ T9204] ? __msan_metadata_ptr_for_store_4+0x13/0x20 [ 83.703671][ T9204] ? __alloc_skb+0x762/0xac0 [ 83.708291][ T9204] ? kmsan_get_metadata+0x11d/0x180 [ 83.713523][ T9204] ? kmsan_get_shadow_origin_ptr+0x81/0xb0 [ 83.719334][ T9204] __ppp_xmit_process+0x1902/0x2970 [ 83.724553][ T9204] ppp_xmit_process+0x147/0x2f0 [ 83.729569][ T9204] ppp_write+0x6bb/0x790 [ 83.733815][ T9204] do_iter_write+0xa0a/0xdc0 [ 83.738395][ T9204] ? ppp_read+0xbf0/0xbf0 [ 83.742755][ T9204] do_pwritev+0x487/0x7d0 [ 83.747069][ T9204] ? ppp_ioctl+0x37b4/0x41b0 [ 83.751659][ T9204] ? __msan_metadata_ptr_for_load_4+0x10/0x20 [ 83.757710][ T9204] ? prepare_exit_to_usermode+0x1ca/0x520 [ 83.763465][ T9204] __se_sys_pwritev+0xc6/0xe0 [ 83.768141][ T9204] __x64_sys_pwritev+0x62/0x80 [ 83.772985][ T9204] do_syscall_64+0xb8/0x160 [ 83.777483][ T9204] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 83.783358][ T9204] RIP: 0033:0x4412f9 [ 83.787260][ T9204] 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 9b 09 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 83.807717][ T9204] RSP: 002b:00007ffd3ec8cf78 EFLAGS: 00000246 ORIG_RAX: 0000000000000128 [ 83.816114][ T9204] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004412f9 [ 83.824081][ T9204] RDX: 0000000000000003 RSI: 0000000020000480 RDI: 0000000000000003 [ 83.832055][ T9204] RBP: 0000000000014688 R08: 00000000004002c8 R09: 00000000004002c8 [ 83.840570][ T9204] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000402120 [ 83.848527][ T9204] R13: 00000000004021b0 R14: 0000000000000000 R15: 0000000000000000 [ 83.856492][ T9204] [ 83.858802][ T9204] Uninit was created at: [ 83.863048][ T9204] kmsan_internal_poison_shadow+0x66/0xd0 [ 83.869107][ T9204] kmsan_slab_alloc+0x8a/0xe0 [ 83.873768][ T9204] __kmalloc_node_track_caller+0xb40/0x1200 [ 83.879730][ T9204] __alloc_skb+0x2fd/0xac0 [ 83.884130][ T9204] ppp_write+0x115/0x790 [ 83.888442][ T9204] do_iter_write+0xa0a/0xdc0 [ 83.893146][ T9204] do_pwritev+0x487/0x7d0 [ 83.897557][ T9204] __se_sys_pwritev+0xc6/0xe0 [ 83.902216][ T9204] __x64_sys_pwritev+0x62/0x80 [ 83.906962][ T9204] do_syscall_64+0xb8/0x160 [ 83.911464][ T9204] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 83.917343][ T9204] ===================================================== [ 83.924252][ T9204] Disabling lock debugging due to kernel taint [ 83.930384][ T9204] Kernel panic - not syncing: panic_on_warn set ... [ 83.936966][ T9204] CPU: 0 PID: 9204 Comm: syz-executor789 Tainted: G B 5.7.0-rc4-syzkaller #0 [ 83.947004][ T9204] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 83.957053][ T9204] Call Trace: [ 83.960339][ T9204] dump_stack+0x1c9/0x220 [ 83.964658][ T9204] panic+0x3d5/0xc3e [ 83.968557][ T9204] kmsan_report+0x1df/0x1e0 [ 83.973056][ T9204] __msan_warning+0x58/0xa0 [ 83.977545][ T9204] slhc_compress+0x2c5/0x2fb0 [ 83.982225][ T9204] ? kmsan_get_shadow_origin_ptr+0x81/0xb0 [ 83.988036][ T9204] ? kmsan_get_shadow_origin_ptr+0x81/0xb0 [ 83.993832][ T9204] ? __msan_metadata_ptr_for_store_4+0x13/0x20 [ 83.999974][ T9204] ? __alloc_skb+0x762/0xac0 [ 84.004551][ T9204] ? kmsan_get_metadata+0x11d/0x180 [ 84.009745][ T9204] ? kmsan_get_shadow_origin_ptr+0x81/0xb0 [ 84.015537][ T9204] __ppp_xmit_process+0x1902/0x2970 [ 84.020743][ T9204] ppp_xmit_process+0x147/0x2f0 [ 84.025626][ T9204] ppp_write+0x6bb/0x790 [ 84.029877][ T9204] do_iter_write+0xa0a/0xdc0 [ 84.034457][ T9204] ? ppp_read+0xbf0/0xbf0 [ 84.038779][ T9204] do_pwritev+0x487/0x7d0 [ 84.043104][ T9204] ? ppp_ioctl+0x37b4/0x41b0 [ 84.047704][ T9204] ? __msan_metadata_ptr_for_load_4+0x10/0x20 [ 84.053765][ T9204] ? prepare_exit_to_usermode+0x1ca/0x520 [ 84.059482][ T9204] __se_sys_pwritev+0xc6/0xe0 [ 84.064164][ T9204] __x64_sys_pwritev+0x62/0x80 [ 84.069001][ T9204] do_syscall_64+0xb8/0x160 [ 84.073495][ T9204] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 84.079380][ T9204] RIP: 0033:0x4412f9 [ 84.083604][ T9204] 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 9b 09 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 84.104158][ T9204] RSP: 002b:00007ffd3ec8cf78 EFLAGS: 00000246 ORIG_RAX: 0000000000000128 [ 84.112561][ T9204] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004412f9 [ 84.120533][ T9204] RDX: 0000000000000003 RSI: 0000000020000480 RDI: 0000000000000003 [ 84.128923][ T9204] RBP: 0000000000014688 R08: 00000000004002c8 R09: 00000000004002c8 [ 84.136882][ T9204] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000402120 [ 84.145913][ T9204] R13: 00000000004021b0 R14: 0000000000000000 R15: 0000000000000000 [ 84.155692][ T9204] Kernel Offset: 0x2d600000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff) [ 84.167313][ T9204] Rebooting in 86400 seconds..