[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 15.400490] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 17.848799] random: sshd: uninitialized urandom read (32 bytes read) [ 18.083106] random: sshd: uninitialized urandom read (32 bytes read) [ 18.800867] random: sshd: uninitialized urandom read (32 bytes read) [ 28.950662] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.2' (ECDSA) to the list of known hosts. [ 34.505940] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 34.585664] BUG: sleeping function called from invalid context at arch/x86/mm/fault.c:1340 [ 34.594088] in_atomic(): 0, irqs_disabled(): 1, pid: 4468, name: syz-executor366 [ 34.601594] INFO: lockdep is turned off. [ 34.605627] irq event stamp: 0 [ 34.608795] hardirqs last enabled at (0): [<0000000000000000>] (null) [ 34.616313] hardirqs last disabled at (0): [] copy_process.part.41+0x18cb/0x7340 [ 34.625393] softirqs last enabled at (0): [] copy_process.part.41+0x196c/0x7340 [ 34.634471] softirqs last disabled at (0): [<0000000000000000>] (null) [ 34.641981] CPU: 1 PID: 4468 Comm: syz-executor366 Not tainted 4.18.0-rc3-next-20180709+ #2 [ 34.650443] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 34.659770] Call Trace: [ 34.662341] dump_stack+0x1c9/0x2b4 [ 34.665949] ? dump_stack_print_info.cold.2+0x52/0x52 [ 34.671120] ___might_sleep.cold.86+0x11f/0x13a [ 34.675769] ? check_same_owner+0x340/0x340 [ 34.680074] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 34.685594] ? trace_9p_protocol_dump+0xbe/0x3a0 [ 34.690327] __might_sleep+0x95/0x190 [ 34.694104] __do_page_fault+0x3b6/0xe50 [ 34.698142] ? mm_fault_error+0x380/0x380 [ 34.702297] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 34.707815] ? p9pdu_readf+0xb78/0x2170 [ 34.711776] do_page_fault+0xf6/0x8c0 [ 34.715569] ? p9pdu_writef+0xe0/0xe0 [ 34.719357] ? vmalloc_sync_all+0x30/0x30 [ 34.723484] ? ksys_dup3+0x690/0x690 [ 34.727176] ? check_same_owner+0x340/0x340 [ 34.731477] ? p9_fd_poll+0x2b0/0x2b0 [ 34.735256] ? kasan_kmalloc+0xc4/0xe0 [ 34.739131] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 34.743961] page_fault+0x1e/0x30 [ 34.747399] RIP: 0010:kfree+0xb2/0x260 [ 34.751446] 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 [ 34.770566] RSP: 0018:ffff8801c70275d0 EFLAGS: 00010046 [ 34.775910] RAX: ffffea000022f7c8 RBX: ffffffff88bdfcbc RCX: ffffea000022f7c7 [ 34.783168] RDX: ffffea000022f7c0 RSI: ffffffff87700939 RDI: ffffffff88bdfcbc [ 34.790421] RBP: ffff8801c70275f0 R08: ffff8801ac59c100 R09: ffffed0038e04df8 [ 34.797681] R10: ffffed0035aa8313 R11: 0000000000000001 R12: 0000000000000286 [ 34.804934] R13: 0000000000000000 R14: ffff8801c7027740 R15: ffff8801ac400340 [ 34.812205] ? p9_client_create+0xf09/0x16c9 [ 34.816599] p9_client_create+0xf43/0x16c9 [ 34.820830] ? p9_client_read+0xc60/0xc60 [ 34.824960] ? lock_acquire+0x1e4/0x540 [ 34.828923] ? lock_acquire+0x1e4/0x540 [ 34.832875] ? fs_reclaim_acquire+0x20/0x20 [ 34.837177] ? lock_release+0xa30/0xa30 [ 34.841135] ? __lockdep_init_map+0x105/0x590 [ 34.845610] ? kasan_check_write+0x14/0x20 [ 34.849821] ? __init_rwsem+0x1cc/0x2a0 [ 34.853787] ? do_raw_write_unlock.cold.8+0x49/0x49 [ 34.858976] ? __kmalloc_track_caller+0x311/0x760 [ 34.863798] ? save_stack+0xa9/0xd0 [ 34.867409] ? save_stack+0x43/0xd0 [ 34.871014] ? kasan_kmalloc+0xc4/0xe0 [ 34.874877] ? kmem_cache_alloc_trace+0x152/0x780 [ 34.879699] ? memcpy+0x45/0x50 [ 34.882960] v9fs_session_init+0x21a/0x1a80 [ 34.887257] ? rcu_note_context_switch+0x730/0x730 [ 34.892264] ? do_mount+0x69e/0x1fb0 [ 34.895965] ? lock_acquire+0x1e4/0x540 [ 34.899919] ? v9fs_show_options+0x7e0/0x7e0 [ 34.904305] ? lock_release+0xa30/0xa30 [ 34.908258] ? check_same_owner+0x340/0x340 [ 34.912557] ? lock_downgrade+0x8f0/0x8f0 [ 34.916698] ? kasan_unpoison_shadow+0x35/0x50 [ 34.921279] ? kasan_kmalloc+0xc4/0xe0 [ 34.925159] ? kmem_cache_alloc_trace+0x318/0x780 [ 34.929980] ? kasan_unpoison_shadow+0x35/0x50 [ 34.934539] ? kasan_kmalloc+0xc4/0xe0 [ 34.938414] v9fs_mount+0x7c/0x900 [ 34.941943] ? v9fs_drop_inode+0x150/0x150 [ 34.946158] legacy_get_tree+0x118/0x440 [ 34.950199] vfs_get_tree+0x1cb/0x5c0 [ 34.953978] do_mount+0x6c1/0x1fb0 [ 34.957509] ? check_same_owner+0x340/0x340 [ 34.961810] ? lock_release+0xa30/0xa30 [ 34.965784] ? copy_mount_string+0x40/0x40 [ 34.970095] ? kasan_kmalloc+0xc4/0xe0 [ 34.974054] ? kmem_cache_alloc_trace+0x318/0x780 [ 34.978889] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 34.984411] ? _copy_from_user+0xdf/0x150 [ 34.988536] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 34.994052] ? copy_mount_options+0x285/0x380 [ 34.998527] ksys_mount+0x12d/0x140 [ 35.002131] __x64_sys_mount+0xbe/0x150 [ 35.006096] do_syscall_64+0x1b9/0x820 [ 35.009961] ? syscall_return_slowpath+0x5e0/0x5e0 [ 35.014867] ? syscall_return_slowpath+0x31d/0x5e0 [ 35.019773] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 35.024777] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 35.030289] ? prepare_exit_to_usermode+0x291/0x3b0 [ 35.035398] ? perf_trace_sys_enter+0xb10/0xb10 [ 35.040584] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 35.045419] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 35.050589] RIP: 0033:0x440179 [ 35.053839] 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 [ 35.072951] RSP: 002b:00007ffd51c0bc58 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5 [ 35.080643] RAX: ffffffffffffffda RBX: 0030656c69662f2e RCX: 0000000000440179 [ 35.087890] RDX: 0000000020000340 RSI: 00000000200000c0 RDI: 0000000000000000 [ 35.095137] RBP: 00000000006ca018 R08: 00000000200003c0 R09: 00000000004002c8 [ 35.102397] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000401a00 [ 35.110304] R13: 0000000000401a90 R14: 0000000000000000 R15: 0000000000000000 [ 35.117572] BUG: unable to handle kernel NULL pointer dereference at 0000000000000074 [ 35.125516] PGD 1bcf3c067 P4D 1bcf3c067 PUD 1bce1f067 PMD 0 [ 35.131311] Oops: 0000 [#1] SMP KASAN [ 35.135100] CPU: 1 PID: 4468 Comm: syz-executor366 Tainted: G W 4.18.0-rc3-next-20180709+ #2 [ 35.144954] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 35.154292] RIP: 0010:kfree+0xb2/0x260 [ 35.158162] 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 [ 35.177280] RSP: 0018:ffff8801c70275d0 EFLAGS: 00010046 [ 35.182620] RAX: ffffea000022f7c8 RBX: ffffffff88bdfcbc RCX: ffffea000022f7c7 [ 35.189883] RDX: ffffea000022f7c0 RSI: ffffffff87700939 RDI: ffffffff88bdfcbc [ 35.197140] RBP: ffff8801c70275f0 R08: ffff8801ac59c100 R09: ffffed0038e04df8 [ 35.204394] R10: ffffed0035aa8313 R11: 0000000000000001 R12: 0000000000000286 [ 35.211644] R13: 0000000000000000 R14: ffff8801c7027740 R15: ffff8801ac400340 [ 35.218893] FS: 00000000021e6880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 35.227095] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 35.233025] CR2: 0000000000000074 CR3: 00000001d2c98000 CR4: 00000000001406e0 [ 35.240288] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 35.247536] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 35.254805] Call Trace: [ 35.257616] p9_client_create+0xf43/0x16c9 [ 35.262192] ? p9_client_read+0xc60/0xc60 [ 35.266336] ? lock_acquire+0x1e4/0x540 [ 35.270323] ? lock_acquire+0x1e4/0x540 [ 35.274284] ? fs_reclaim_acquire+0x20/0x20 [ 35.278590] ? lock_release+0xa30/0xa30 [ 35.282549] ? __lockdep_init_map+0x105/0x590 [ 35.287201] ? kasan_check_write+0x14/0x20 [ 35.291415] ? __init_rwsem+0x1cc/0x2a0 [ 35.295557] ? do_raw_write_unlock.cold.8+0x49/0x49 [ 35.300553] ? __kmalloc_track_caller+0x311/0x760 [ 35.305374] ? save_stack+0xa9/0xd0 [ 35.308986] ? save_stack+0x43/0xd0 [ 35.312595] ? kasan_kmalloc+0xc4/0xe0 [ 35.316463] ? kmem_cache_alloc_trace+0x152/0x780 [ 35.321291] ? memcpy+0x45/0x50 [ 35.325163] v9fs_session_init+0x21a/0x1a80 [ 35.329473] ? rcu_note_context_switch+0x730/0x730 [ 35.334379] ? do_mount+0x69e/0x1fb0 [ 35.338075] ? lock_acquire+0x1e4/0x540 [ 35.342030] ? v9fs_show_options+0x7e0/0x7e0 [ 35.346772] ? lock_release+0xa30/0xa30 [ 35.350723] ? check_same_owner+0x340/0x340 [ 35.355035] ? lock_downgrade+0x8f0/0x8f0 [ 35.359183] ? kasan_unpoison_shadow+0x35/0x50 [ 35.363830] ? kasan_kmalloc+0xc4/0xe0 [ 35.367706] ? kmem_cache_alloc_trace+0x318/0x780 [ 35.372558] ? kasan_unpoison_shadow+0x35/0x50 [ 35.377640] ? kasan_kmalloc+0xc4/0xe0 [ 35.381518] v9fs_mount+0x7c/0x900 [ 35.385048] ? v9fs_drop_inode+0x150/0x150 [ 35.389263] legacy_get_tree+0x118/0x440 [ 35.393309] vfs_get_tree+0x1cb/0x5c0 [ 35.397177] do_mount+0x6c1/0x1fb0 [ 35.400701] ? check_same_owner+0x340/0x340 [ 35.405000] ? lock_release+0xa30/0xa30 [ 35.408951] ? copy_mount_string+0x40/0x40 [ 35.413170] ? kasan_kmalloc+0xc4/0xe0 [ 35.417046] ? kmem_cache_alloc_trace+0x318/0x780 [ 35.421977] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 35.427496] ? _copy_from_user+0xdf/0x150 [ 35.431622] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 35.437147] ? copy_mount_options+0x285/0x380 [ 35.441622] ksys_mount+0x12d/0x140 [ 35.445228] __x64_sys_mount+0xbe/0x150 [ 35.449184] do_syscall_64+0x1b9/0x820 [ 35.453052] ? syscall_return_slowpath+0x5e0/0x5e0 [ 35.457964] ? syscall_return_slowpath+0x31d/0x5e0 [ 35.462872] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 35.467868] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 35.473386] ? prepare_exit_to_usermode+0x291/0x3b0 [ 35.478388] ? perf_trace_sys_enter+0xb10/0xb10 [ 35.483034] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 35.487945] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 35.493119] RIP: 0033:0x440179 [ 35.496285] 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 [ 35.515398] RSP: 002b:00007ffd51c0bc58 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5 [ 35.523083] RAX: ffffffffffffffda RBX: 0030656c69662f2e RCX: 0000000000440179 [ 35.530330] RDX: 0000000020000340 RSI: 00000000200000c0 RDI: 0000000000000000 [ 35.537579] RBP: 00000000006ca018 R08: 00000000200003c0 R09: 00000000004002c8 [ 35.544825] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000401a00 [ 35.552073] R13: 0000000000401a90 R14: 0000000000000000 R15: 0000000000000000 [ 35.559332] Modules linked in: [ 35.562505] Dumping ftrace buffer: [ 35.566027] (ftrace buffer empty) [ 35.569716] CR2: 0000000000000074 [ 35.573162] ---[ end trace b62f68fe1d454183 ]--- [ 35.577897] RIP: 0010:kfree+0xb2/0x260 [ 35.581766] 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 [ 35.600887] RSP: 0018:ffff8801c70275d0 EFLAGS: 00010046 [ 35.606226] RAX: ffffea000022f7c8 RBX: ffffffff88bdfcbc RCX: ffffea000022f7c7 [ 35.613470] RDX: ffffea000022f7c0 RSI: ffffffff87700939 RDI: ffffffff88bdfcbc [ 35.620719] RBP: ffff8801c70275f0 R08: ffff8801ac59c100 R09: ffffed0038e04df8 [ 35.628053] R10: ffffed0035aa8313 R11: 0000000000000001 R12: 0000000000000286 [ 35.635308] R13: 0000000000000000 R14: ffff8801c7027740 R15: ffff8801ac400340 [ 35.642560] FS: 00000000021e6880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 35.650770] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 35.656629] CR2: 0000000000000074 CR3: 00000001d2c98000 CR4: 00000000001406e0 [ 35.663879] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 35.671135] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 35.678381] Kernel panic - not syncing: Fatal exception [ 35.684719] Dumping ftrace buffer: [ 35.688264] (ftrace buffer empty) [ 35.691953] Kernel Offset: disabled [ 35.695558] Rebooting in 86400 seconds..