[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.442713] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 24.084662] random: sshd: uninitialized urandom read (32 bytes read) [ 24.413835] random: sshd: uninitialized urandom read (32 bytes read) [ 25.276124] random: sshd: uninitialized urandom read (32 bytes read) [ 25.432359] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.46' (ECDSA) to the list of known hosts. [ 30.898525] random: sshd: uninitialized urandom read (32 bytes read) 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 executing program [ 30.995392] ================================================================== [ 31.002936] BUG: KASAN: slab-out-of-bounds in pdu_read+0x90/0xd0 [ 31.009101] Read of size 42655 at addr ffff8801b9a4042d by task syz-executor204/4514 [ 31.016985] [ 31.018628] CPU: 0 PID: 4514 Comm: syz-executor204 Not tainted 4.18.0-rc4+ #140 [ 31.026188] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.035552] Call Trace: [ 31.038177] dump_stack+0x1c9/0x2b4 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 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 31.042085] ? dump_stack_print_info.cold.2+0x52/0x52 [ 31.047294] ? printk+0xa7/0xcf [ 31.050590] ? kmsg_dump_rewind_nolock+0xe4/0xe4 [ 31.055366] ? pdu_read+0x90/0xd0 [ 31.058833] print_address_description+0x6c/0x20b [ 31.063691] ? pdu_read+0x90/0xd0 [ 31.067223] kasan_report.cold.7+0x242/0x2fe [ 31.071654] check_memory_region+0x13e/0x1b0 [ 31.076080] memcpy+0x23/0x50 [ 31.079199] pdu_read+0x90/0xd0 [ 31.082498] p9pdu_readf+0x579/0x2170 [ 31.086317] ? p9pdu_writef+0xe0/0xe0 [ 31.090137] ? __fget+0x414/0x670 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 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 31.093601] ? rcu_is_watching+0x61/0x150 [ 31.097844] ? expand_files.part.8+0x9c0/0x9c0 [ 31.102444] ? rcu_read_lock_sched_held+0x108/0x120 [ 31.107488] ? p9_fd_show_options+0x1c0/0x1c0 [ 31.112009] p9_client_create+0xde0/0x16c9 [ 31.116273] ? p9_client_read+0xc60/0xc60 [ 31.120438] ? find_held_lock+0x36/0x1c0 [ 31.124534] ? __lockdep_init_map+0x105/0x590 [ 31.129058] ? kasan_check_write+0x14/0x20 [ 31.133304] ? __init_rwsem+0x1cc/0x2a0 [ 31.137299] ? do_raw_write_unlock.cold.8+0x49/0x49 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 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 [ 31.142329] ? rcu_read_lock_sched_held+0x108/0x120 [ 31.147359] ? __kmalloc_track_caller+0x5f5/0x760 [ 31.152215] ? save_stack+0xa9/0xd0 [ 31.155860] ? save_stack+0x43/0xd0 [ 31.159493] ? kasan_kmalloc+0xc4/0xe0 [ 31.163385] ? kmem_cache_alloc_trace+0x152/0x780 [ 31.168240] ? memcpy+0x45/0x50 [ 31.171537] v9fs_session_init+0x21a/0x1a80 [ 31.175874] ? find_held_lock+0x36/0x1c0 [ 31.179967] ? v9fs_show_options+0x7e0/0x7e0 [ 31.184393] ? kasan_check_read+0x11/0x20 [ 31.188550] ? rcu_is_watching+0x8c/0x150 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 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 [ 31.192708] ? rcu_pm_notify+0xc0/0xc0 [ 31.196622] ? v9fs_mount+0x61/0x900 [ 31.200348] ? rcu_read_lock_sched_held+0x108/0x120 [ 31.205555] ? kmem_cache_alloc_trace+0x616/0x780 [ 31.210421] ? __sanitizer_cov_trace_const_cmp2+0x18/0x20 [ 31.215977] v9fs_mount+0x7c/0x900 [ 31.219542] mount_fs+0xae/0x328 [ 31.222940] vfs_kern_mount.part.34+0xdc/0x4e0 [ 31.227540] ? may_umount+0xb0/0xb0 [ 31.231181] ? _raw_read_unlock+0x22/0x30 [ 31.235359] ? __get_fs_type+0x97/0xc0 [ 31.239258] do_mount+0x581/0x30e0 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 executing program executing program executing program executing program executing program executing program executing program executing program [ 31.242818] ? copy_mount_string+0x40/0x40 [ 31.247100] ? copy_mount_options+0x5f/0x380 [ 31.251528] ? rcu_read_lock_sched_held+0x108/0x120 [ 31.256561] ? kmem_cache_alloc_trace+0x616/0x780 [ 31.261423] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 31.266978] ? _copy_from_user+0xdf/0x150 [ 31.271144] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 31.276694] ? copy_mount_options+0x285/0x380 [ 31.281384] ksys_mount+0x12d/0x140 [ 31.285032] __x64_sys_mount+0xbe/0x150 [ 31.289027] ? trace_hardirqs_on_caller+0x421/0x5c0 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 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 31.294122] do_syscall_64+0x1b9/0x820 [ 31.298032] ? syscall_slow_exit_work+0x500/0x500 [ 31.303075] ? syscall_return_slowpath+0x5e0/0x5e0 [ 31.308021] ? syscall_return_slowpath+0x31d/0x5e0 [ 31.312973] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 31.318529] ? retint_user+0x18/0x18 [ 31.322266] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 31.327136] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 31.332333] RIP: 0033:0x4405e9 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 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 31.335520] Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 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 fb 0f fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 31.354895] RSP: 002b:00007fff8478ba28 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5 [ 31.362643] RAX: ffffffffffffffda RBX: ffffffffffffffff RCX: 00000000004405e9 [ 31.369952] RDX: 0000000020000140 RSI: 0000000020000100 RDI: 0000000000000000 [ 31.377246] RBP: 0030656c69662f2e R08: 00000000200002c0 R09: 00000000004002c8 [ 31.384537] R10: 0000000000000000 R11: 0000000000000206 R12: 64663d736e617274 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 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 31.391823] R13: 0000040000000002 R14: 0000000000000000 R15: 0000000000000000 [ 31.399285] [ 31.400930] Allocated by task 4514: [ 31.404570] save_stack+0x43/0xd0 [ 31.408041] kasan_kmalloc+0xc4/0xe0 [ 31.411772] __kmalloc+0x14e/0x760 [ 31.415323] p9_fcall_alloc+0x1e/0x90 [ 31.419154] p9_client_prepare_req.part.8+0x754/0xcd0 [ 31.424357] p9_client_rpc+0x1bd/0x1400 [ 31.428344] p9_client_create+0xd09/0x16c9 [ 31.432589] v9fs_session_init+0x21a/0x1a80 [ 31.437094] v9fs_mount+0x7c/0x900 [ 31.440679] mount_fs+0xae/0x328 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 executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 31.444056] vfs_kern_mount.part.34+0xdc/0x4e0 [ 31.448652] do_mount+0x581/0x30e0 [ 31.452207] ksys_mount+0x12d/0x140 [ 31.455844] __x64_sys_mount+0xbe/0x150 [ 31.459826] do_syscall_64+0x1b9/0x820 [ 31.463726] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 31.468916] [ 31.470548] Freed by task 0: [ 31.473558] (stack is not available) [ 31.477279] [ 31.478920] The buggy address belongs to the object at ffff8801b9a40400 [ 31.478920] which belongs to the cache kmalloc-16384 of size 16384 [ 31.491956] The buggy address is located 45 bytes inside of 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 executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 31.491956] 16384-byte region [ffff8801b9a40400, ffff8801b9a44400) [ 31.503924] The buggy address belongs to the page: [ 31.508869] page:ffffea0006e69000 count:1 mapcount:0 mapping:ffff8801da802200 index:0x0 compound_mapcount: 0 [ 31.518859] flags: 0x2fffc0000008100(slab|head) [ 31.523636] raw: 02fffc0000008100 ffffea0006cc2608 ffffea0007331608 ffff8801da802200 [ 31.531540] raw: 0000000000000000 ffff8801b9a40400 0000000100000001 0000000000000000 [ 31.539430] page dumped because: kasan: bad access detected [ 31.545144] 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 executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 31.546776] Memory state around the buggy address: [ 31.551719] ffff8801b9a42300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 31.559093] ffff8801b9a42380: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 31.566467] >ffff8801b9a42400: 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc fc [ 31.573828] ^ [ 31.578249] ffff8801b9a42480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 31.585622] ffff8801b9a42500: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc 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 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 [ 31.593009] ================================================================== [ 31.600407] Disabling lock debugging due to kernel taint [ 31.606112] Kernel panic - not syncing: panic_on_warn set ... [ 31.606112] [ 31.613491] CPU: 0 PID: 4514 Comm: syz-executor204 Tainted: G B 4.18.0-rc4+ #140 [ 31.622327] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.631681] Call Trace: [ 31.634282] dump_stack+0x1c9/0x2b4 [ 31.637924] ? dump_stack_print_info.cold.2+0x52/0x52 [ 31.643130] ? trace_hardirqs_on_thunk+0x1a/0x1c 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 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 [ 31.647906] panic+0x238/0x4e7 [ 31.651108] ? add_taint.cold.5+0x16/0x16 [ 31.655265] ? do_raw_spin_unlock+0xa7/0x2f0 [ 31.659684] ? pdu_read+0x90/0xd0 [ 31.663176] kasan_end_report+0x47/0x4f [ 31.667157] kasan_report.cold.7+0x76/0x2fe [ 31.671489] check_memory_region+0x13e/0x1b0 [ 31.675909] memcpy+0x23/0x50 [ 31.679023] pdu_read+0x90/0xd0 [ 31.682309] p9pdu_readf+0x579/0x2170 [ 31.686117] ? p9pdu_writef+0xe0/0xe0 [ 31.690006] ? __fget+0x414/0x670 [ 31.693468] ? rcu_is_watching+0x61/0x150 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 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 [ 31.697624] ? expand_files.part.8+0x9c0/0x9c0 [ 31.702218] ? rcu_read_lock_sched_held+0x108/0x120 [ 31.707250] ? p9_fd_show_options+0x1c0/0x1c0 [ 31.711822] p9_client_create+0xde0/0x16c9 [ 31.716069] ? p9_client_read+0xc60/0xc60 [ 31.720223] ? find_held_lock+0x36/0x1c0 [ 31.724298] ? __lockdep_init_map+0x105/0x590 [ 31.728810] ? kasan_check_write+0x14/0x20 [ 31.733049] ? __init_rwsem+0x1cc/0x2a0 [ 31.737051] ? do_raw_write_unlock.cold.8+0x49/0x49 [ 31.742085] ? rcu_read_lock_sched_held+0x108/0x120 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 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 [ 31.747113] ? __kmalloc_track_caller+0x5f5/0x760 [ 31.752060] ? save_stack+0xa9/0xd0 [ 31.755729] ? save_stack+0x43/0xd0 [ 31.759361] ? kasan_kmalloc+0xc4/0xe0 [ 31.763260] ? kmem_cache_alloc_trace+0x152/0x780 [ 31.768111] ? memcpy+0x45/0x50 [ 31.771399] v9fs_session_init+0x21a/0x1a80 [ 31.775727] ? find_held_lock+0x36/0x1c0 [ 31.779802] ? v9fs_show_options+0x7e0/0x7e0 [ 31.784218] ? kasan_check_read+0x11/0x20 [ 31.788371] ? rcu_is_watching+0x8c/0x150 [ 31.792525] ? rcu_pm_notify+0xc0/0xc0 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 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 [ 31.796436] ? v9fs_mount+0x61/0x900 [ 31.800162] ? rcu_read_lock_sched_held+0x108/0x120 [ 31.805188] ? kmem_cache_alloc_trace+0x616/0x780 [ 31.810047] ? __sanitizer_cov_trace_const_cmp2+0x18/0x20 [ 31.815595] v9fs_mount+0x7c/0x900 [ 31.819149] mount_fs+0xae/0x328 [ 31.822525] vfs_kern_mount.part.34+0xdc/0x4e0 [ 31.827114] ? may_umount+0xb0/0xb0 [ 31.830755] ? _raw_read_unlock+0x22/0x30 [ 31.834924] ? __get_fs_type+0x97/0xc0 [ 31.838825] do_mount+0x581/0x30e0 [ 31.842388] ? copy_mount_string+0x40/0x40 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 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 [ 31.846650] ? copy_mount_options+0x5f/0x380 [ 31.851071] ? rcu_read_lock_sched_held+0x108/0x120 [ 31.856186] ? kmem_cache_alloc_trace+0x616/0x780 [ 31.861066] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 31.866618] ? _copy_from_user+0xdf/0x150 [ 31.870780] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 31.876328] ? copy_mount_options+0x285/0x380 [ 31.880836] ksys_mount+0x12d/0x140 [ 31.884480] __x64_sys_mount+0xbe/0x150 [ 31.888464] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 31.893489] do_syscall_64+0x1b9/0x820 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 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 [ 31.897380] ? syscall_slow_exit_work+0x500/0x500 [ 31.902230] ? syscall_return_slowpath+0x5e0/0x5e0 [ 31.907239] ? syscall_return_slowpath+0x31d/0x5e0 [ 31.912182] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 31.917732] ? retint_user+0x18/0x18 [ 31.921458] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 31.926322] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 31.931627] RIP: 0033:0x4405e9 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 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 [ 31.934811] Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 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 fb 0f fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 31.954087] RSP: 002b:00007fff8478ba28 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5 [ 31.961802] RAX: ffffffffffffffda RBX: ffffffffffffffff RCX: 00000000004405e9 [ 31.969074] RDX: 0000000020000140 RSI: 0000000020000100 RDI: 0000000000000000 [ 31.976346] RBP: 0030656c69662f2e R08: 00000000200002c0 R09: 00000000004002c8 [ 31.983617] R10: 0000000000000000 R11: 0000000000000206 R12: 64663d736e617274 [ 31.990976] R13: 0000040000000002 R14: 0000000000000000 R15: 0000000000000000 [ 31.998981] Dumping ftrace buffer: [ 32.002525] (ftrace buffer empty) [ 32.006242] Kernel Offset: disabled [ 32.009862] Rebooting in 86400 seconds..