[ 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 '10.128.0.14' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 157.657398][ T8477] ===================================================== [ 157.664499][ T8477] BUG: KMSAN: uninit-value in kmsan_check_memory+0xd/0x10 [ 157.671615][ T8477] CPU: 0 PID: 8477 Comm: syz-executor641 Not tainted 5.8.0-rc5-syzkaller #0 [ 157.681362][ T8477] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 157.691488][ T8477] Call Trace: [ 157.694794][ T8477] dump_stack+0x1df/0x240 [ 157.699132][ T8477] kmsan_report+0xf7/0x1e0 [ 157.703553][ T8477] kmsan_internal_check_memory+0x358/0x3d0 [ 157.710485][ T8477] ? kmsan_get_metadata+0x11d/0x180 [ 157.715743][ T8477] ? kmsan_get_metadata+0x4f/0x180 [ 157.720865][ T8477] kmsan_check_memory+0xd/0x10 [ 157.725687][ T8477] copy_page_to_iter+0x7b4/0x1bb0 [ 157.730708][ T8477] ? kmsan_get_metadata+0x11d/0x180 [ 157.735953][ T8477] pipe_read+0x6a6/0x1a00 [ 157.740321][ T8477] ? init_wait_entry+0x190/0x190 [ 157.745270][ T8477] ? __ia32_sys_pipe+0x50/0x50 [ 157.750058][ T8477] vfs_read+0xc67/0x1230 [ 157.754338][ T8477] ksys_read+0x267/0x450 [ 157.758601][ T8477] __se_sys_read+0x92/0xb0 [ 157.763041][ T8477] __x64_sys_read+0x4a/0x70 [ 157.767561][ T8477] do_syscall_64+0xb0/0x150 [ 157.772069][ T8477] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 157.777957][ T8477] RIP: 0033:0x445939 [ 157.781843][ T8477] Code: Bad RIP value. [ 157.785904][ T8477] RSP: 002b:00007f89fc3d8db8 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 [ 157.794309][ T8477] RAX: ffffffffffffffda RBX: 00000000006dac48 RCX: 0000000000445939 [ 157.802497][ T8477] RDX: 0000000000000002 RSI: 0000000020000100 RDI: 0000000000000003 [ 157.810465][ T8477] RBP: 00000000006dac40 R08: 0000000000000000 R09: 0000000000000000 [ 157.819010][ T8477] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dac4c [ 157.826981][ T8477] R13: 00007fff6d03b79f R14: 00007f89fc3d99c0 R15: 20c49ba5e353f7cf [ 157.834963][ T8477] [ 157.837285][ T8477] Uninit was created at: [ 157.841659][ T8477] kmsan_save_stack_with_flags+0x3c/0x90 [ 157.847439][ T8477] kmsan_alloc_page+0xb9/0x180 [ 157.852201][ T8477] __alloc_pages_nodemask+0x56a2/0x5dc0 [ 157.857725][ T8477] alloc_pages_current+0x672/0x990 [ 157.862831][ T8477] push_pipe+0x605/0xb70 [ 157.867200][ T8477] iov_iter_get_pages_alloc+0x18a9/0x21c0 [ 157.872966][ T8477] do_splice_to+0x4fc/0x14f0 [ 157.877553][ T8477] do_splice+0x2ccd/0x30a0 [ 157.882013][ T8477] __se_sys_splice+0x271/0x420 [ 157.886773][ T8477] __x64_sys_splice+0x6e/0x90 [ 157.891442][ T8477] do_syscall_64+0xb0/0x150 [ 157.895951][ T8477] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 157.901920][ T8477] [ 157.904241][ T8477] Bytes 0-1 of 2 are uninitialized [ 157.909491][ T8477] Memory access of size 2 starts at ffff88f894c06000 [ 157.916153][ T8477] ===================================================== [ 157.923078][ T8477] Disabling lock debugging due to kernel taint [ 157.929225][ T8477] Kernel panic - not syncing: panic_on_warn set ... [ 157.935814][ T8477] CPU: 0 PID: 8477 Comm: syz-executor641 Tainted: G B 5.8.0-rc5-syzkaller #0 [ 157.945867][ T8477] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 157.956129][ T8477] Call Trace: [ 157.959506][ T8477] dump_stack+0x1df/0x240 [ 157.963980][ T8477] panic+0x3d5/0xc3e [ 157.968076][ T8477] kmsan_report+0x1df/0x1e0 [ 157.972588][ T8477] kmsan_internal_check_memory+0x358/0x3d0 [ 157.978561][ T8477] ? kmsan_get_metadata+0x11d/0x180 [ 157.983892][ T8477] ? kmsan_get_metadata+0x4f/0x180 [ 157.989011][ T8477] kmsan_check_memory+0xd/0x10 [ 157.993823][ T8477] copy_page_to_iter+0x7b4/0x1bb0 [ 157.998858][ T8477] ? kmsan_get_metadata+0x11d/0x180 [ 158.004204][ T8477] pipe_read+0x6a6/0x1a00 [ 158.008615][ T8477] ? init_wait_entry+0x190/0x190 [ 158.013556][ T8477] ? __ia32_sys_pipe+0x50/0x50 [ 158.018365][ T8477] vfs_read+0xc67/0x1230 [ 158.022720][ T8477] ksys_read+0x267/0x450 [ 158.026970][ T8477] __se_sys_read+0x92/0xb0 [ 158.031438][ T8477] __x64_sys_read+0x4a/0x70 [ 158.035988][ T8477] do_syscall_64+0xb0/0x150 [ 158.040593][ T8477] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 158.046483][ T8477] RIP: 0033:0x445939 [ 158.050361][ T8477] Code: Bad RIP value. [ 158.054449][ T8477] RSP: 002b:00007f89fc3d8db8 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 [ 158.062982][ T8477] RAX: ffffffffffffffda RBX: 00000000006dac48 RCX: 0000000000445939 [ 158.071130][ T8477] RDX: 0000000000000002 RSI: 0000000020000100 RDI: 0000000000000003 [ 158.079097][ T8477] RBP: 00000000006dac40 R08: 0000000000000000 R09: 0000000000000000 [ 158.087392][ T8477] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dac4c [ 158.095360][ T8477] R13: 00007fff6d03b79f R14: 00007f89fc3d99c0 R15: 20c49ba5e353f7cf [ 158.104758][ T8477] Kernel Offset: 0xfa00000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff) [ 158.116590][ T8477] Rebooting in 86400 seconds..