[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 15.869464] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. [ 15.993094] random: sshd: uninitialized urandom read (32 bytes read) [ 16.217611] random: sshd: uninitialized urandom read (32 bytes read) [ 16.922183] random: sshd: uninitialized urandom read (32 bytes read) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 17.059999] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.29' (ECDSA) to the list of known hosts. [ 22.756339] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 22.841481] BUG: sleeping function called from invalid context at arch/x86/mm/fault.c:1340 [ 22.850033] in_atomic(): 0, irqs_disabled(): 1, pid: 4455, name: syz-executor420 [ 22.857568] INFO: lockdep is turned off. [ 22.861616] irq event stamp: 0 [ 22.864806] hardirqs last enabled at (0): [<0000000000000000>] (null) [ 22.872348] hardirqs last disabled at (0): [] copy_process.part.41+0x18cb/0x7340 [ 22.881468] softirqs last enabled at (0): [] copy_process.part.41+0x196c/0x7340 [ 22.890557] softirqs last disabled at (0): [<0000000000000000>] (null) [ 22.898097] CPU: 1 PID: 4455 Comm: syz-executor420 Not tainted 4.18.0-rc3-next-20180709+ #2 [ 22.906591] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 22.915946] Call Trace: [ 22.918550] dump_stack+0x1c9/0x2b4 [ 22.922170] ? dump_stack_print_info.cold.2+0x52/0x52 [ 22.927362] ___might_sleep.cold.86+0x11f/0x13a [ 22.932880] ? check_same_owner+0x340/0x340 [ 22.937194] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 22.942810] ? trace_9p_protocol_dump+0xbe/0x3a0 [ 22.947556] __might_sleep+0x95/0x190 [ 22.951355] __do_page_fault+0x3b6/0xe50 [ 22.955419] ? mm_fault_error+0x380/0x380 [ 22.959567] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 22.965121] ? p9pdu_readf+0xb78/0x2170 [ 22.969094] do_page_fault+0xf6/0x8c0 [ 22.972879] ? p9pdu_writef+0xe0/0xe0 [ 22.976662] ? vmalloc_sync_all+0x30/0x30 [ 22.980793] ? ksys_dup3+0x690/0x690 [ 22.984494] ? check_same_owner+0x340/0x340 [ 22.988813] ? p9_fd_poll+0x2b0/0x2b0 [ 22.992607] ? kasan_kmalloc+0xc4/0xe0 [ 22.996497] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 23.001328] page_fault+0x1e/0x30 [ 23.004787] RIP: 0010:kfree+0xb2/0x260 [ 23.008661] Code: 48 89 df 48 b8 00 00 00 00 00 ea ff ff 48 c1 ea 0c 48 c1 e2 06 48 01 c2 48 8b 42 08 a8 01 48 8d 48 ff 48 0f 45 d1 4c 8b 6a 18 <49> 63 75 74 e8 15 d0 a3 ff 49 63 75 74 48 89 df e8 29 18 a9 01 4c [ 23.027802] RSP: 0018:ffff8801ac62f5d0 EFLAGS: 00010046 [ 23.033157] RAX: ffffea000022f7c8 RBX: ffffffff88bdfcbc RCX: ffffea000022f7c7 [ 23.040438] RDX: ffffea000022f7c0 RSI: ffffffff87700939 RDI: ffffffff88bdfcbc [ 23.047710] RBP: ffff8801ac62f5f0 R08: ffff8801ae2e0700 R09: ffffed00358c5df8 [ 23.054972] R10: ffffed00358b3cf3 R11: 0000000000000001 R12: 0000000000000286 [ 23.062241] R13: 0000000000000000 R14: ffff8801ac62f740 R15: ffff8801abcc0380 [ 23.069526] ? p9_client_create+0xf09/0x16c9 [ 23.073925] p9_client_create+0xf43/0x16c9 [ 23.078152] ? p9_client_read+0xc60/0xc60 [ 23.082290] ? lock_acquire+0x1e4/0x540 [ 23.086255] ? lock_acquire+0x1e4/0x540 [ 23.090238] ? fs_reclaim_acquire+0x20/0x20 [ 23.094547] ? lock_release+0xa30/0xa30 [ 23.098514] ? __lockdep_init_map+0x105/0x590 [ 23.103013] ? kasan_check_write+0x14/0x20 [ 23.107255] ? __init_rwsem+0x1cc/0x2a0 [ 23.111220] ? do_raw_write_unlock.cold.8+0x49/0x49 [ 23.116229] ? __kmalloc_track_caller+0x311/0x760 [ 23.121080] ? save_stack+0xa9/0xd0 [ 23.124702] ? save_stack+0x43/0xd0 [ 23.128315] ? kasan_kmalloc+0xc4/0xe0 [ 23.132197] ? kmem_cache_alloc_trace+0x152/0x780 [ 23.137042] ? memcpy+0x45/0x50 [ 23.140331] v9fs_session_init+0x21a/0x1a80 [ 23.144647] ? rcu_note_context_switch+0x730/0x730 [ 23.149568] ? do_mount+0x69e/0x1fb0 [ 23.153269] ? v9fs_show_options+0x7e0/0x7e0 [ 23.157666] ? kasan_check_read+0x11/0x20 [ 23.161801] ? do_raw_spin_unlock+0xa7/0x2f0 [ 23.166192] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 23.170757] ? kasan_unpoison_shadow+0x35/0x50 [ 23.175335] ? kasan_kmalloc+0xc4/0xe0 [ 23.179216] ? kmem_cache_alloc_trace+0x318/0x780 [ 23.184066] v9fs_mount+0x7c/0x900 [ 23.187613] ? v9fs_drop_inode+0x150/0x150 [ 23.191846] legacy_get_tree+0x118/0x440 [ 23.195892] vfs_get_tree+0x1cb/0x5c0 [ 23.199677] do_mount+0x6c1/0x1fb0 [ 23.203214] ? kasan_check_read+0x11/0x20 [ 23.207359] ? do_raw_spin_unlock+0xa7/0x2f0 [ 23.211762] ? copy_mount_string+0x40/0x40 [ 23.215982] ? kasan_kmalloc+0xc4/0xe0 [ 23.219855] ? kmem_cache_alloc_trace+0x318/0x780 [ 23.224702] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 23.230233] ? copy_mount_options+0x285/0x380 [ 23.234725] ksys_mount+0x12d/0x140 [ 23.238353] __x64_sys_mount+0xbe/0x150 [ 23.242328] do_syscall_64+0x1b9/0x820 [ 23.246204] ? syscall_return_slowpath+0x5e0/0x5e0 [ 23.251119] ? syscall_return_slowpath+0x31d/0x5e0 [ 23.256045] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 23.261073] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 23.266631] ? prepare_exit_to_usermode+0x291/0x3b0 [ 23.271657] ? perf_trace_sys_enter+0xb10/0xb10 [ 23.276325] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 23.281163] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 23.286351] RIP: 0033:0x440149 [ 23.289531] 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 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 23.308671] RSP: 002b:00007ffe40e41168 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5 [ 23.316379] RAX: ffffffffffffffda RBX: 0030656c69662f2e RCX: 0000000000440149 [ 23.323661] RDX: 0000000020000340 RSI: 00000000200000c0 RDI: 0000000000000000 [ 23.330938] RBP: 00000000006ca018 R08: 00000000200001c0 R09: 00000000004002c8 [ 23.338205] R10: 0000000000000000 R11: 0000000000000202 R12: 00000000004019d0 [ 23.345466] R13: 0000000000401a60 R14: 0000000000000000 R15: 0000000000000000 [ 23.352744] BUG: unable to handle kernel NULL pointer dereference at 0000000000000074 [ 23.360695] PGD 1baf06067 P4D 1baf06067 PUD 1baf9a067 PMD 0 [ 23.366501] Oops: 0000 [#1] SMP KASAN [ 23.371436] CPU: 1 PID: 4455 Comm: syz-executor420 Tainted: G W 4.18.0-rc3-next-20180709+ #2 [ 23.381309] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 23.390667] RIP: 0010:kfree+0xb2/0x260 [ 23.394534] Code: 48 89 df 48 b8 00 00 00 00 00 ea ff ff 48 c1 ea 0c 48 c1 e2 06 48 01 c2 48 8b 42 08 a8 01 48 8d 48 ff 48 0f 45 d1 4c 8b 6a 18 <49> 63 75 74 e8 15 d0 a3 ff 49 63 75 74 48 89 df e8 29 18 a9 01 4c [ 23.413671] RSP: 0018:ffff8801ac62f5d0 EFLAGS: 00010046 [ 23.419034] RAX: ffffea000022f7c8 RBX: ffffffff88bdfcbc RCX: ffffea000022f7c7 [ 23.426300] RDX: ffffea000022f7c0 RSI: ffffffff87700939 RDI: ffffffff88bdfcbc [ 23.433583] RBP: ffff8801ac62f5f0 R08: ffff8801ae2e0700 R09: ffffed00358c5df8 [ 23.440844] R10: ffffed00358b3cf3 R11: 0000000000000001 R12: 0000000000000286 [ 23.448111] R13: 0000000000000000 R14: ffff8801ac62f740 R15: ffff8801abcc0380 [ 23.455398] FS: 000000000100b880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 23.463610] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 23.469475] CR2: 0000000000000074 CR3: 00000001baf17000 CR4: 00000000001406e0 [ 23.476733] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 23.483985] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 23.491257] Call Trace: [ 23.493855] p9_client_create+0xf43/0x16c9 [ 23.498085] ? p9_client_read+0xc60/0xc60 [ 23.502220] ? lock_acquire+0x1e4/0x540 [ 23.506201] ? lock_acquire+0x1e4/0x540 [ 23.510165] ? fs_reclaim_acquire+0x20/0x20 [ 23.514477] ? lock_release+0xa30/0xa30 [ 23.518437] ? __lockdep_init_map+0x105/0x590 [ 23.522932] ? kasan_check_write+0x14/0x20 [ 23.527157] ? __init_rwsem+0x1cc/0x2a0 [ 23.531117] ? do_raw_write_unlock.cold.8+0x49/0x49 [ 23.536132] ? __kmalloc_track_caller+0x311/0x760 [ 23.540958] ? save_stack+0xa9/0xd0 [ 23.544573] ? save_stack+0x43/0xd0 [ 23.548188] ? kasan_kmalloc+0xc4/0xe0 [ 23.552064] ? kmem_cache_alloc_trace+0x152/0x780 [ 23.556893] ? memcpy+0x45/0x50 [ 23.560171] v9fs_session_init+0x21a/0x1a80 [ 23.564476] ? rcu_note_context_switch+0x730/0x730 [ 23.569408] ? do_mount+0x69e/0x1fb0 [ 23.573116] ? v9fs_show_options+0x7e0/0x7e0 [ 23.578139] ? kasan_check_read+0x11/0x20 [ 23.582296] ? do_raw_spin_unlock+0xa7/0x2f0 [ 23.586690] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 23.591272] ? kasan_unpoison_shadow+0x35/0x50 [ 23.595856] ? kasan_kmalloc+0xc4/0xe0 [ 23.599745] ? kmem_cache_alloc_trace+0x318/0x780 [ 23.604603] v9fs_mount+0x7c/0x900 [ 23.608138] ? v9fs_drop_inode+0x150/0x150 [ 23.612377] legacy_get_tree+0x118/0x440 [ 23.616428] vfs_get_tree+0x1cb/0x5c0 [ 23.620217] do_mount+0x6c1/0x1fb0 [ 23.623740] ? kasan_check_read+0x11/0x20 [ 23.627885] ? do_raw_spin_unlock+0xa7/0x2f0 [ 23.632306] ? copy_mount_string+0x40/0x40 [ 23.636542] ? kasan_kmalloc+0xc4/0xe0 [ 23.641636] ? kmem_cache_alloc_trace+0x318/0x780 [ 23.646469] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 23.651993] ? copy_mount_options+0x285/0x380 [ 23.656486] ksys_mount+0x12d/0x140 [ 23.660104] __x64_sys_mount+0xbe/0x150 [ 23.664068] do_syscall_64+0x1b9/0x820 [ 23.667940] ? syscall_return_slowpath+0x5e0/0x5e0 [ 23.672857] ? syscall_return_slowpath+0x31d/0x5e0 [ 23.677783] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 23.682791] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 23.688327] ? prepare_exit_to_usermode+0x291/0x3b0 [ 23.693348] ? perf_trace_sys_enter+0xb10/0xb10 [ 23.698010] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 23.702846] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 23.708031] RIP: 0033:0x440149 [ 23.711204] 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 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 23.730352] RSP: 002b:00007ffe40e41168 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5 [ 23.738069] RAX: ffffffffffffffda RBX: 0030656c69662f2e RCX: 0000000000440149 [ 23.745324] RDX: 0000000020000340 RSI: 00000000200000c0 RDI: 0000000000000000 [ 23.752575] RBP: 00000000006ca018 R08: 00000000200001c0 R09: 00000000004002c8 [ 23.759830] R10: 0000000000000000 R11: 0000000000000202 R12: 00000000004019d0 [ 23.767083] R13: 0000000000401a60 R14: 0000000000000000 R15: 0000000000000000 [ 23.774339] Modules linked in: [ 23.777538] Dumping ftrace buffer: [ 23.781067] (ftrace buffer empty) [ 23.784788] CR2: 0000000000000074 [ 23.788232] ---[ end trace ed7d147132e334b9 ]--- [ 23.792994] RIP: 0010:kfree+0xb2/0x260 [ 23.796862] Code: 48 89 df 48 b8 00 00 00 00 00 ea ff ff 48 c1 ea 0c 48 c1 e2 06 48 01 c2 48 8b 42 08 a8 01 48 8d 48 ff 48 0f 45 d1 4c 8b 6a 18 <49> 63 75 74 e8 15 d0 a3 ff 49 63 75 74 48 89 df e8 29 18 a9 01 4c [ 23.816037] RSP: 0018:ffff8801ac62f5d0 EFLAGS: 00010046 [ 23.821400] RAX: ffffea000022f7c8 RBX: ffffffff88bdfcbc RCX: ffffea000022f7c7 [ 23.828655] RDX: ffffea000022f7c0 RSI: ffffffff87700939 RDI: ffffffff88bdfcbc [ 23.835921] RBP: ffff8801ac62f5f0 R08: ffff8801ae2e0700 R09: ffffed00358c5df8 [ 23.843179] R10: ffffed00358b3cf3 R11: 0000000000000001 R12: 0000000000000286 [ 23.850434] R13: 0000000000000000 R14: ffff8801ac62f740 R15: ffff8801abcc0380 [ 23.857703] FS: 000000000100b880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 23.865918] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 23.871789] CR2: 0000000000000074 CR3: 00000001baf17000 CR4: 00000000001406e0 [ 23.879050] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 23.886317] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 23.893591] Kernel panic - not syncing: Fatal exception [ 23.899375] Dumping ftrace buffer: [ 23.902912] (ftrace buffer empty) [ 23.906609] Kernel Offset: disabled [ 23.910227] Rebooting in 86400 seconds..