[ OK ] Started Getty on tty2. [ OK ] Started Getty on tty1. [ OK ] Started Serial Getty on ttyS0. [ OK ] Started System Logging Service. [ OK ] Started getty on tty2-tty6 if dbus and logind are not available. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.146' (ECDSA) to the list of known hosts. syzkaller login: [ 129.797020][ T8211] ===================================================== [ 129.803996][ T8211] BUG: KMSAN: uninit-value in try_grab_compound_head+0x638/0x1070 [ 129.811787][ T8211] try_grab_compound_head+0x638/0x1070 [ 129.817277][ T8211] follow_hugetlb_page+0x2478/0x2f60 [ 129.822548][ T8211] __get_user_pages+0x24c6/0x2ee0 [ 129.827578][ T8211] __gup_longterm_locked+0x3b6/0x6c0 [ 129.832855][ T8211] pin_user_pages+0x17f/0x1d0 [ 129.837543][ T8211] io_sqe_buffer_register+0x41a/0x2670 [ 129.843004][ T8211] io_sqe_buffers_register+0xa65/0x1d20 [ 129.848534][ T8211] __do_sys_io_uring_register+0x577/0x5090 [ 129.854327][ T8211] __x64_sys_io_uring_register+0x11d/0x160 [ 129.860119][ T8211] do_syscall_64+0xb3/0x180 [ 129.864607][ T8211] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 129.870492][ T8211] [ 129.872808][ T8211] Uninit was created at: [ 129.877031][ T8211] kmsan_internal_poison_memory+0x56/0xc0 [ 129.882743][ T8211] kmsan_kmalloc_large+0xe2/0x150 [ 129.887758][ T8211] kmalloc_large_node+0x299/0x2e0 [ 129.892790][ T8211] __kmalloc_node+0xb92/0x1440 [ 129.897539][ T8211] kvmalloc_node+0x201/0x3d0 [ 129.902126][ T8211] io_sqe_buffer_register+0x1e4/0x2670 [ 129.907576][ T8211] io_sqe_buffers_register+0xa65/0x1d20 [ 129.913102][ T8211] __do_sys_io_uring_register+0x577/0x5090 [ 129.918897][ T8211] __x64_sys_io_uring_register+0x11d/0x160 [ 129.924688][ T8211] do_syscall_64+0xb3/0x180 [ 129.929180][ T8211] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 129.935119][ T8211] ===================================================== [ 129.942029][ T8211] Disabling lock debugging due to kernel taint [ 129.948170][ T8211] Kernel panic - not syncing: panic_on_kmsan set ... [ 129.954820][ T8211] CPU: 0 PID: 8211 Comm: syz-executor836 Tainted: G B 5.13.0-syzkaller #0 [ 129.964605][ T8211] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 129.974642][ T8211] Call Trace: [ 129.977910][ T8211] dump_stack+0x24c/0x2e0 [ 129.982311][ T8211] panic+0x4c6/0xea7 [ 129.986190][ T8211] ? add_taint+0x17c/0x210 [ 129.990589][ T8211] ? __msan_metadata_ptr_for_store_1+0x13/0x20 [ 129.996746][ T8211] kmsan_report+0x2fa/0x300 [ 130.001232][ T8211] ? __msan_warning+0xd7/0x150 [ 130.005975][ T8211] ? try_grab_compound_head+0x638/0x1070 [ 130.011637][ T8211] ? follow_hugetlb_page+0x2478/0x2f60 [ 130.017083][ T8211] ? __get_user_pages+0x24c6/0x2ee0 [ 130.022272][ T8211] ? __gup_longterm_locked+0x3b6/0x6c0 [ 130.027718][ T8211] ? pin_user_pages+0x17f/0x1d0 [ 130.032549][ T8211] ? io_sqe_buffer_register+0x41a/0x2670 [ 130.038163][ T8211] ? io_sqe_buffers_register+0xa65/0x1d20 [ 130.043865][ T8211] ? __do_sys_io_uring_register+0x577/0x5090 [ 130.049832][ T8211] ? __x64_sys_io_uring_register+0x11d/0x160 [ 130.055796][ T8211] ? do_syscall_64+0xb3/0x180 [ 130.060463][ T8211] ? entry_SYSCALL_64_after_hwframe+0x44/0xae [ 130.066522][ T8211] __msan_warning+0xd7/0x150 [ 130.071098][ T8211] try_grab_compound_head+0x638/0x1070 [ 130.076543][ T8211] ? __msan_poison_alloca+0x15a/0x1a0 [ 130.081895][ T8211] ? kmsan_get_metadata+0x116/0x180 [ 130.087125][ T8211] follow_hugetlb_page+0x2478/0x2f60 [ 130.092402][ T8211] __get_user_pages+0x24c6/0x2ee0 [ 130.097418][ T8211] __gup_longterm_locked+0x3b6/0x6c0 [ 130.102691][ T8211] pin_user_pages+0x17f/0x1d0 [ 130.107394][ T8211] io_sqe_buffer_register+0x41a/0x2670 [ 130.112846][ T8211] ? kmsan_get_metadata+0x116/0x180 [ 130.118031][ T8211] ? __msan_metadata_ptr_for_load_8+0x10/0x20 [ 130.124116][ T8211] ? kmsan_get_metadata+0x116/0x180 [ 130.129311][ T8211] io_sqe_buffers_register+0xa65/0x1d20 [ 130.134847][ T8211] __do_sys_io_uring_register+0x577/0x5090 [ 130.140652][ T8211] ? up_read+0x40/0x2b0 [ 130.144794][ T8211] ? kmsan_get_metadata+0x116/0x180 [ 130.149995][ T8211] ? kmsan_get_shadow_origin_ptr+0x90/0xc0 [ 130.155785][ T8211] ? kmsan_get_metadata+0x116/0x180 [ 130.160967][ T8211] __x64_sys_io_uring_register+0x11d/0x160 [ 130.166761][ T8211] do_syscall_64+0xb3/0x180 [ 130.171256][ T8211] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 130.177130][ T8211] RIP: 0033:0x43fc79 [ 130.181005][ T8211] Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 b1 14 00 00 90 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 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48 [ 130.200593][ T8211] RSP: 002b:00007ffe569a4a48 EFLAGS: 00000246 ORIG_RAX: 00000000000001ab [ 130.209028][ T8211] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000043fc79 [ 130.216983][ T8211] RDX: 00000000200001c0 RSI: 0000000000000000 RDI: 0000000000000003 [ 130.224937][ T8211] RBP: 0000000000000000 R08: 0000000010000000 R09: 0000000000000000 [ 130.232889][ T8211] R10: 0000000000000001 R11: 0000000000000246 R12: 0000000000403500 [ 130.240859][ T8211] R13: 431bde82d7b634db R14: 00000000004ae018 R15: 0000000000400488 [ 130.250027][ T8211] Kernel Offset: disabled [ 130.254341][ T8211] Rebooting in 86400 seconds..