[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 15.786582] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 19.451905] random: sshd: uninitialized urandom read (32 bytes read) [ 19.671882] random: sshd: uninitialized urandom read (32 bytes read) [ 20.390391] random: sshd: uninitialized urandom read (32 bytes read) [ 20.523342] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.15.197' (ECDSA) to the list of known hosts. [ 25.939398] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 26.020182] BUG: sleeping function called from invalid context at arch/x86/mm/fault.c:1340 [ 26.028621] in_atomic(): 0, irqs_disabled(): 1, pid: 4454, name: syz-executor111 [ 26.036132] INFO: lockdep is turned off. [ 26.040172] irq event stamp: 0 [ 26.043343] hardirqs last enabled at (0): [<0000000000000000>] (null) [ 26.050862] hardirqs last disabled at (0): [] copy_process.part.41+0x18cb/0x7340 [ 26.059947] softirqs last enabled at (0): [] copy_process.part.41+0x196c/0x7340 [ 26.069026] softirqs last disabled at (0): [<0000000000000000>] (null) [ 26.076549] CPU: 1 PID: 4454 Comm: syz-executor111 Not tainted 4.18.0-rc3-next-20180709+ #2 [ 26.085016] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 26.094358] Call Trace: [ 26.096932] dump_stack+0x1c9/0x2b4 [ 26.100541] ? dump_stack_print_info.cold.2+0x52/0x52 [ 26.105725] ___might_sleep.cold.86+0x11f/0x13a [ 26.110383] ? check_same_owner+0x340/0x340 [ 26.114686] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 26.120204] ? trace_9p_protocol_dump+0xbe/0x3a0 [ 26.124944] __might_sleep+0x95/0x190 [ 26.128725] __do_page_fault+0x3b6/0xe50 [ 26.132776] ? mm_fault_error+0x380/0x380 [ 26.136915] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 26.142431] ? p9pdu_readf+0xb78/0x2170 [ 26.146396] do_page_fault+0xf6/0x8c0 [ 26.150176] ? p9pdu_writef+0xe0/0xe0 [ 26.153967] ? vmalloc_sync_all+0x30/0x30 [ 26.158098] ? ksys_dup3+0x690/0x690 [ 26.161805] ? do_raw_spin_lock+0xc1/0x200 [ 26.166046] ? kasan_kmalloc+0xc4/0xe0 [ 26.169922] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 26.174750] page_fault+0x1e/0x30 [ 26.178199] RIP: 0010:kfree+0xb2/0x260 [ 26.182066] 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 [ 26.201215] RSP: 0018:ffff8801cd58f5d0 EFLAGS: 00010046 [ 26.206577] RAX: ffffea000022f7c8 RBX: ffffffff88bdfcbc RCX: ffffea000022f7c7 [ 26.213856] RDX: ffffea000022f7c0 RSI: ffffffff87700939 RDI: ffffffff88bdfcbc [ 26.221111] RBP: ffff8801cd58f5f0 R08: ffff8801d97d8680 R09: ffffed0039ab1df8 [ 26.228481] R10: ffffed00357e9acb R11: 0000000000000001 R12: 0000000000000286 [ 26.235855] R13: 0000000000000000 R14: ffff8801cd58f740 R15: ffff8801aba10340 [ 26.243128] ? p9_client_create+0xf09/0x16c9 [ 26.247526] p9_client_create+0xf43/0x16c9 [ 26.251752] ? p9_client_read+0xc60/0xc60 [ 26.255896] ? lock_acquire+0x1e4/0x540 [ 26.259857] ? lock_acquire+0x1e4/0x540 [ 26.263819] ? fs_reclaim_acquire+0x20/0x20 [ 26.268132] ? lock_release+0xa30/0xa30 [ 26.272093] ? __lockdep_init_map+0x105/0x590 [ 26.276579] ? kasan_check_write+0x14/0x20 [ 26.280801] ? __init_rwsem+0x1cc/0x2a0 [ 26.284769] ? do_raw_write_unlock.cold.8+0x49/0x49 [ 26.289775] ? __kmalloc_track_caller+0x311/0x760 [ 26.294618] ? save_stack+0xa9/0xd0 [ 26.298246] ? save_stack+0x43/0xd0 [ 26.301867] ? kasan_kmalloc+0xc4/0xe0 [ 26.305748] ? kmem_cache_alloc_trace+0x152/0x780 [ 26.310581] ? memcpy+0x45/0x50 [ 26.313862] v9fs_session_init+0x21a/0x1a80 [ 26.318166] ? rcu_note_context_switch+0x730/0x730 [ 26.323084] ? do_mount+0x69e/0x1fb0 [ 26.326784] ? lock_acquire+0x1e4/0x540 [ 26.330747] ? v9fs_show_options+0x7e0/0x7e0 [ 26.335173] ? lock_release+0xa30/0xa30 [ 26.339234] ? check_same_owner+0x340/0x340 [ 26.343545] ? lock_downgrade+0x8f0/0x8f0 [ 26.347684] ? kasan_unpoison_shadow+0x35/0x50 [ 26.352267] ? kasan_kmalloc+0xc4/0xe0 [ 26.356155] ? kmem_cache_alloc_trace+0x318/0x780 [ 26.361006] ? kasan_unpoison_shadow+0x35/0x50 [ 26.365592] ? kasan_kmalloc+0xc4/0xe0 [ 26.369465] v9fs_mount+0x7c/0x900 [ 26.372991] ? v9fs_drop_inode+0x150/0x150 [ 26.377235] legacy_get_tree+0x118/0x440 [ 26.381289] vfs_get_tree+0x1cb/0x5c0 [ 26.385074] do_mount+0x6c1/0x1fb0 [ 26.388607] ? check_same_owner+0x340/0x340 [ 26.392958] ? lock_release+0xa30/0xa30 [ 26.396950] ? copy_mount_string+0x40/0x40 [ 26.401181] ? kasan_kmalloc+0xc4/0xe0 [ 26.405056] ? kmem_cache_alloc_trace+0x318/0x780 [ 26.409889] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 26.415427] ? _copy_from_user+0xdf/0x150 [ 26.419598] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 26.425148] ? copy_mount_options+0x285/0x380 [ 26.429634] ksys_mount+0x12d/0x140 [ 26.433249] __x64_sys_mount+0xbe/0x150 [ 26.437214] do_syscall_64+0x1b9/0x820 [ 26.441100] ? syscall_return_slowpath+0x5e0/0x5e0 [ 26.446031] ? syscall_return_slowpath+0x31d/0x5e0 [ 26.450949] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 26.455960] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 26.461489] ? prepare_exit_to_usermode+0x291/0x3b0 [ 26.466489] ? perf_trace_sys_enter+0xb10/0xb10 [ 26.471493] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 26.476322] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 26.481499] RIP: 0033:0x440149 [ 26.484683] 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 [ 26.503881] RSP: 002b:00007ffd9263fe68 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5 [ 26.511578] RAX: ffffffffffffffda RBX: 0030656c69662f2e RCX: 0000000000440149 [ 26.518842] RDX: 0000000020000340 RSI: 00000000200000c0 RDI: 0000000000000000 [ 26.526107] RBP: 00000000006ca018 R08: 00000000200001c0 R09: 00000000004002c8 [ 26.533374] R10: 0000000000000000 R11: 0000000000000202 R12: 00000000004019d0 [ 26.540639] R13: 0000000000401a60 R14: 0000000000000000 R15: 0000000000000000 [ 26.547925] BUG: unable to handle kernel NULL pointer dereference at 0000000000000074 [ 26.555895] PGD 1c7b68067 P4D 1c7b68067 PUD 1b4b61067 PMD 0 [ 26.561692] Oops: 0000 [#1] SMP KASAN [ 26.565483] CPU: 1 PID: 4454 Comm: syz-executor111 Tainted: G W 4.18.0-rc3-next-20180709+ #2 [ 26.575349] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 26.584713] RIP: 0010:kfree+0xb2/0x260 [ 26.588588] 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 [ 26.607726] RSP: 0018:ffff8801cd58f5d0 EFLAGS: 00010046 [ 26.613167] RAX: ffffea000022f7c8 RBX: ffffffff88bdfcbc RCX: ffffea000022f7c7 [ 26.620424] RDX: ffffea000022f7c0 RSI: ffffffff87700939 RDI: ffffffff88bdfcbc [ 26.627687] RBP: ffff8801cd58f5f0 R08: ffff8801d97d8680 R09: ffffed0039ab1df8 [ 26.634962] R10: ffffed00357e9acb R11: 0000000000000001 R12: 0000000000000286 [ 26.642217] R13: 0000000000000000 R14: ffff8801cd58f740 R15: ffff8801aba10340 [ 26.649476] FS: 0000000001e13880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 26.657701] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 26.663580] CR2: 0000000000000074 CR3: 00000001bd277000 CR4: 00000000001406e0 [ 26.670851] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 26.678131] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 26.685398] Call Trace: [ 26.687989] p9_client_create+0xf43/0x16c9 [ 26.692215] ? p9_client_read+0xc60/0xc60 [ 26.696362] ? lock_acquire+0x1e4/0x540 [ 26.700435] ? lock_acquire+0x1e4/0x540 [ 26.704418] ? fs_reclaim_acquire+0x20/0x20 [ 26.708736] ? lock_release+0xa30/0xa30 [ 26.712692] ? __lockdep_init_map+0x105/0x590 [ 26.717179] ? kasan_check_write+0x14/0x20 [ 26.721414] ? __init_rwsem+0x1cc/0x2a0 [ 26.725368] ? do_raw_write_unlock.cold.8+0x49/0x49 [ 26.730366] ? __kmalloc_track_caller+0x311/0x760 [ 26.735201] ? save_stack+0xa9/0xd0 [ 26.738808] ? save_stack+0x43/0xd0 [ 26.742437] ? kasan_kmalloc+0xc4/0xe0 [ 26.746305] ? kmem_cache_alloc_trace+0x152/0x780 [ 26.751128] ? memcpy+0x45/0x50 [ 26.754395] v9fs_session_init+0x21a/0x1a80 [ 26.758724] ? rcu_note_context_switch+0x730/0x730 [ 26.763650] ? do_mount+0x69e/0x1fb0 [ 26.767353] ? lock_acquire+0x1e4/0x540 [ 26.771330] ? v9fs_show_options+0x7e0/0x7e0 [ 26.775728] ? lock_release+0xa30/0xa30 [ 26.779691] ? check_same_owner+0x340/0x340 [ 26.784005] ? lock_downgrade+0x8f0/0x8f0 [ 26.788148] ? kasan_unpoison_shadow+0x35/0x50 [ 26.792729] ? kasan_kmalloc+0xc4/0xe0 [ 26.796601] ? kmem_cache_alloc_trace+0x318/0x780 [ 26.801435] ? kasan_unpoison_shadow+0x35/0x50 [ 26.806018] ? kasan_kmalloc+0xc4/0xe0 [ 26.809900] v9fs_mount+0x7c/0x900 [ 26.813424] ? v9fs_drop_inode+0x150/0x150 [ 26.817644] legacy_get_tree+0x118/0x440 [ 26.821693] vfs_get_tree+0x1cb/0x5c0 [ 26.825474] do_mount+0x6c1/0x1fb0 [ 26.828997] ? check_same_owner+0x340/0x340 [ 26.833316] ? lock_release+0xa30/0xa30 [ 26.837296] ? copy_mount_string+0x40/0x40 [ 26.841524] ? kasan_kmalloc+0xc4/0xe0 [ 26.845397] ? kmem_cache_alloc_trace+0x318/0x780 [ 26.850230] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 26.855763] ? _copy_from_user+0xdf/0x150 [ 26.859895] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 26.865421] ? copy_mount_options+0x285/0x380 [ 26.869911] ksys_mount+0x12d/0x140 [ 26.873528] __x64_sys_mount+0xbe/0x150 [ 26.877502] do_syscall_64+0x1b9/0x820 [ 26.881373] ? syscall_return_slowpath+0x5e0/0x5e0 [ 26.886289] ? syscall_return_slowpath+0x31d/0x5e0 [ 26.892094] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 26.897114] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 26.902645] ? prepare_exit_to_usermode+0x291/0x3b0 [ 26.907651] ? perf_trace_sys_enter+0xb10/0xb10 [ 26.912301] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 26.917155] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 26.922352] RIP: 0033:0x440149 [ 26.925528] 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 [ 26.944695] RSP: 002b:00007ffd9263fe68 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5 [ 26.952401] RAX: ffffffffffffffda RBX: 0030656c69662f2e RCX: 0000000000440149 [ 26.959662] RDX: 0000000020000340 RSI: 00000000200000c0 RDI: 0000000000000000 [ 26.966922] RBP: 00000000006ca018 R08: 00000000200001c0 R09: 00000000004002c8 [ 26.974197] R10: 0000000000000000 R11: 0000000000000202 R12: 00000000004019d0 [ 26.981449] R13: 0000000000401a60 R14: 0000000000000000 R15: 0000000000000000 [ 26.988720] Modules linked in: [ 26.991905] Dumping ftrace buffer: [ 26.995427] (ftrace buffer empty) [ 26.999140] CR2: 0000000000000074 [ 27.002590] ---[ end trace 7995f3a1abd28e11 ]--- [ 27.007351] RIP: 0010:kfree+0xb2/0x260 [ 27.011222] 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 [ 27.030348] RSP: 0018:ffff8801cd58f5d0 EFLAGS: 00010046 [ 27.035717] RAX: ffffea000022f7c8 RBX: ffffffff88bdfcbc RCX: ffffea000022f7c7 [ 27.042966] RDX: ffffea000022f7c0 RSI: ffffffff87700939 RDI: ffffffff88bdfcbc [ 27.050220] RBP: ffff8801cd58f5f0 R08: ffff8801d97d8680 R09: ffffed0039ab1df8 [ 27.057483] R10: ffffed00357e9acb R11: 0000000000000001 R12: 0000000000000286 [ 27.064741] R13: 0000000000000000 R14: ffff8801cd58f740 R15: ffff8801aba10340 [ 27.072001] FS: 0000000001e13880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 27.080219] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 27.086103] CR2: 0000000000000074 CR3: 00000001bd277000 CR4: 00000000001406e0 [ 27.093362] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 27.100626] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 27.107880] Kernel panic - not syncing: Fatal exception [ 27.113699] Dumping ftrace buffer: [ 27.117224] (ftrace buffer empty) [ 27.120922] Kernel Offset: disabled [ 27.124527] Rebooting in 86400 seconds..