[ 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 '10.128.10.40' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 141.692795][ T8457] ===================================================== [ 141.699761][ T8457] BUG: KMSAN: uninit-value in ucma_connect+0x2aa/0xab0 [ 141.706594][ T8457] CPU: 0 PID: 8457 Comm: syz-executor069 Not tainted 5.8.0-rc5-syzkaller #0 [ 141.715246][ T8457] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 141.725284][ T8457] Call Trace: [ 141.728576][ T8457] dump_stack+0x1df/0x240 [ 141.732894][ T8457] kmsan_report+0xf7/0x1e0 [ 141.737297][ T8457] __msan_warning+0x58/0xa0 [ 141.741787][ T8457] ucma_connect+0x2aa/0xab0 [ 141.746290][ T8457] ? kmsan_get_metadata+0x4f/0x180 [ 141.751400][ T8457] ? kmsan_set_origin_checked+0x95/0xf0 [ 141.756929][ T8457] ? kmsan_internal_unpoison_shadow+0x2f/0x40 [ 141.762982][ T8457] ? _copy_from_user+0x15b/0x260 [ 141.767903][ T8457] ? kmsan_get_metadata+0x4f/0x180 [ 141.773003][ T8457] ? ucma_query_route+0x13c0/0x13c0 [ 141.778187][ T8457] ucma_write+0x5c5/0x630 [ 141.782513][ T8457] do_iter_write+0x710/0xdc0 [ 141.787109][ T8457] ? ucma_get_global_nl_info+0xe0/0xe0 [ 141.792548][ T8457] do_writev+0x42d/0x8f0 [ 141.796788][ T8457] ? kmsan_get_shadow_origin_ptr+0x81/0xb0 [ 141.802574][ T8457] ? __msan_metadata_ptr_for_store_4+0x13/0x20 [ 141.808708][ T8457] ? __prepare_exit_to_usermode+0x16c/0x4d0 [ 141.814601][ T8457] __se_sys_writev+0x9b/0xb0 [ 141.819180][ T8457] __x64_sys_writev+0x4a/0x70 [ 141.823839][ T8457] do_syscall_64+0xb0/0x150 [ 141.828849][ T8457] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 141.834718][ T8457] RIP: 0033:0x4402a9 [ 141.838588][ T8457] Code: Bad RIP value. [ 141.842822][ T8457] RSP: 002b:00007ffd6e4541e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000014 [ 141.851209][ T8457] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 00000000004402a9 [ 141.859177][ T8457] RDX: 0000000000000001 RSI: 00000000200000c0 RDI: 0000000000000005 [ 141.867131][ T8457] RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8 [ 141.875084][ T8457] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401ab0 [ 141.883038][ T8457] R13: 0000000000401b40 R14: 0000000000000000 R15: 0000000000000000 [ 141.891004][ T8457] [ 141.893434][ T8457] Local variable ----cmd@ucma_connect created at: [ 141.899849][ T8457] ucma_connect+0xe1/0xab0 [ 141.904256][ T8457] ucma_connect+0xe1/0xab0 [ 141.908653][ T8457] ===================================================== [ 141.915665][ T8457] Disabling lock debugging due to kernel taint [ 141.921808][ T8457] Kernel panic - not syncing: panic_on_warn set ... [ 141.928375][ T8457] CPU: 0 PID: 8457 Comm: syz-executor069 Tainted: G B 5.8.0-rc5-syzkaller #0 [ 141.938422][ T8457] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 141.948457][ T8457] Call Trace: [ 141.952008][ T8457] dump_stack+0x1df/0x240 [ 141.956336][ T8457] panic+0x3d5/0xc3e [ 141.960238][ T8457] kmsan_report+0x1df/0x1e0 [ 141.964728][ T8457] __msan_warning+0x58/0xa0 [ 141.969218][ T8457] ucma_connect+0x2aa/0xab0 [ 141.973730][ T8457] ? kmsan_get_metadata+0x4f/0x180 [ 141.978826][ T8457] ? kmsan_set_origin_checked+0x95/0xf0 [ 141.984356][ T8457] ? kmsan_internal_unpoison_shadow+0x2f/0x40 [ 141.990410][ T8457] ? _copy_from_user+0x15b/0x260 [ 141.995328][ T8457] ? kmsan_get_metadata+0x4f/0x180 [ 142.000440][ T8457] ? ucma_query_route+0x13c0/0x13c0 [ 142.005619][ T8457] ucma_write+0x5c5/0x630 [ 142.009945][ T8457] do_iter_write+0x710/0xdc0 [ 142.014570][ T8457] ? ucma_get_global_nl_info+0xe0/0xe0 [ 142.020102][ T8457] do_writev+0x42d/0x8f0 [ 142.024342][ T8457] ? kmsan_get_shadow_origin_ptr+0x81/0xb0 [ 142.030132][ T8457] ? __msan_metadata_ptr_for_store_4+0x13/0x20 [ 142.036269][ T8457] ? __prepare_exit_to_usermode+0x16c/0x4d0 [ 142.042151][ T8457] __se_sys_writev+0x9b/0xb0 [ 142.046732][ T8457] __x64_sys_writev+0x4a/0x70 [ 142.051393][ T8457] do_syscall_64+0xb0/0x150 [ 142.055897][ T8457] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 142.061768][ T8457] RIP: 0033:0x4402a9 [ 142.065655][ T8457] Code: Bad RIP value. [ 142.069697][ T8457] RSP: 002b:00007ffd6e4541e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000014 [ 142.078089][ T8457] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 00000000004402a9 [ 142.086115][ T8457] RDX: 0000000000000001 RSI: 00000000200000c0 RDI: 0000000000000005 [ 142.094070][ T8457] RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8 [ 142.102038][ T8457] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401ab0 [ 142.109993][ T8457] R13: 0000000000401b40 R14: 0000000000000000 R15: 0000000000000000 [ 142.119117][ T8457] Kernel Offset: 0x1b400000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff) [ 142.130731][ T8457] Rebooting in 86400 seconds..