[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 17.411352] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. [ 18.154449] random: sshd: uninitialized urandom read (32 bytes read) [ 18.408650] random: sshd: uninitialized urandom read (32 bytes read) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 19.096733] random: sshd: uninitialized urandom read (32 bytes read) [ 19.231670] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.47' (ECDSA) to the list of known hosts. [ 24.727908] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 24.810716] BUG: sleeping function called from invalid context at arch/x86/mm/fault.c:1340 [ 24.819154] in_atomic(): 0, irqs_disabled(): 1, pid: 4497, name: syz-executor673 [ 24.826673] INFO: lockdep is turned off. [ 24.830720] irq event stamp: 0 [ 24.833888] hardirqs last enabled at (0): [<0000000000000000>] (null) [ 24.841428] hardirqs last disabled at (0): [] copy_process.part.41+0x1953/0x73d0 [ 24.850537] softirqs last enabled at (0): [] copy_process.part.41+0x19f4/0x73d0 [ 24.859624] softirqs last disabled at (0): [<0000000000000000>] (null) [ 24.867147] CPU: 1 PID: 4497 Comm: syz-executor673 Not tainted 4.18.0-rc4-next-20180711+ #4 [ 24.875614] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 24.884948] Call Trace: [ 24.887527] dump_stack+0x1c9/0x2b4 [ 24.891139] ? dump_stack_print_info.cold.2+0x52/0x52 [ 24.896317] ___might_sleep.cold.86+0x11f/0x13a [ 24.900968] ? check_same_owner+0x340/0x340 [ 24.905274] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 24.910823] ? trace_9p_protocol_dump+0xbe/0x3a0 [ 24.915594] __might_sleep+0x95/0x190 [ 24.919391] __do_page_fault+0x3b6/0xe50 [ 24.923451] ? mm_fault_error+0x380/0x380 [ 24.927592] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 24.933219] ? p9pdu_readf+0xb78/0x2170 [ 24.937182] do_page_fault+0xf6/0x8c0 [ 24.940979] ? p9pdu_writef+0xe0/0xe0 [ 24.944769] ? vmalloc_sync_all+0x30/0x30 [ 24.948905] ? ksys_dup3+0x690/0x690 [ 24.952619] ? check_same_owner+0x340/0x340 [ 24.956926] ? p9_fd_poll+0x2b0/0x2b0 [ 24.960715] ? kasan_kmalloc+0xc4/0xe0 [ 24.964597] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 24.969438] page_fault+0x1e/0x30 [ 24.972882] RIP: 0010:kfree+0xb2/0x260 [ 24.976744] 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 bb a3 ff 49 63 75 74 48 89 df e8 69 9e a9 01 4c [ 24.995872] RSP: 0018:ffff8801ac20f5d0 EFLAGS: 00010046 [ 25.001225] RAX: ffffea000022f488 RBX: ffffffff88bd24d4 RCX: ffffea000022f487 [ 25.008481] RDX: ffffea000022f480 RSI: ffffffff877046e0 RDI: ffffffff88bd24d4 [ 25.015751] RBP: ffff8801ac20f5f0 R08: ffff8801abef22c0 R09: ffffed0035841df8 [ 25.023034] R10: ffffed003581881b R11: 0000000000000001 R12: 0000000000000282 [ 25.030309] R13: 0000000000000000 R14: ffff8801ac20f740 R15: ffff8801ac360380 [ 25.037596] ? p9_client_create+0xfb0/0x1770 [ 25.042011] p9_client_create+0xfea/0x1770 [ 25.046250] ? p9_client_read+0xc60/0xc60 [ 25.050405] ? lock_acquire+0x1e4/0x540 [ 25.054394] ? lock_acquire+0x1e4/0x540 [ 25.058375] ? fs_reclaim_acquire+0x20/0x20 [ 25.062712] ? lock_release+0xa30/0xa30 [ 25.066705] ? __lockdep_init_map+0x105/0x590 [ 25.071201] ? kasan_check_write+0x14/0x20 [ 25.075437] ? __init_rwsem+0x1cc/0x2a0 [ 25.079399] ? do_raw_write_unlock.cold.8+0x49/0x49 [ 25.084403] ? __kmalloc_track_caller+0x311/0x760 [ 25.089229] ? save_stack+0xa9/0xd0 [ 25.092840] ? save_stack+0x43/0xd0 [ 25.096450] ? kasan_kmalloc+0xc4/0xe0 [ 25.100318] ? kmem_cache_alloc_trace+0x152/0x780 [ 25.105229] ? memcpy+0x45/0x50 [ 25.108508] v9fs_session_init+0x21a/0x1a80 [ 25.112814] ? rcu_note_context_switch+0x730/0x730 [ 25.117744] ? do_mount+0x69e/0x1fb0 [ 25.121551] ? lock_acquire+0x1e4/0x540 [ 25.125510] ? v9fs_show_options+0x7e0/0x7e0 [ 25.129901] ? lock_release+0xa30/0xa30 [ 25.133956] ? check_same_owner+0x340/0x340 [ 25.138273] ? lock_downgrade+0x8f0/0x8f0 [ 25.142407] ? kasan_unpoison_shadow+0x35/0x50 [ 25.146975] ? kasan_kmalloc+0xc4/0xe0 [ 25.150856] ? kmem_cache_alloc_trace+0x318/0x780 [ 25.155682] ? kasan_unpoison_shadow+0x35/0x50 [ 25.160246] ? kasan_kmalloc+0xc4/0xe0 [ 25.164126] v9fs_mount+0x7c/0x900 [ 25.167662] ? v9fs_drop_inode+0x150/0x150 [ 25.171880] legacy_get_tree+0x118/0x440 [ 25.175923] vfs_get_tree+0x1cb/0x5c0 [ 25.179705] do_mount+0x6c1/0x1fb0 [ 25.183229] ? check_same_owner+0x340/0x340 [ 25.187535] ? lock_release+0xa30/0xa30 [ 25.191514] ? copy_mount_string+0x40/0x40 [ 25.195738] ? kasan_kmalloc+0xc4/0xe0 [ 25.199615] ? kmem_cache_alloc_trace+0x318/0x780 [ 25.204454] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 25.209974] ? _copy_from_user+0xdf/0x150 [ 25.214114] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 25.219657] ? copy_mount_options+0x285/0x380 [ 25.224142] ksys_mount+0x12d/0x140 [ 25.227758] __x64_sys_mount+0xbe/0x150 [ 25.231727] do_syscall_64+0x1b9/0x820 [ 25.235615] ? syscall_return_slowpath+0x5e0/0x5e0 [ 25.240541] ? syscall_return_slowpath+0x31d/0x5e0 [ 25.245453] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 25.250452] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 25.255979] ? prepare_exit_to_usermode+0x291/0x3b0 [ 25.260982] ? perf_trace_sys_enter+0xb10/0xb10 [ 25.265648] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 25.270484] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 25.275666] RIP: 0033:0x440179 [ 25.278848] 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 [ 25.298075] RSP: 002b:00007ffd790b72b8 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5 [ 25.305776] RAX: ffffffffffffffda RBX: 0030656c69662f2e RCX: 0000000000440179 [ 25.313042] RDX: 0000000020000340 RSI: 00000000200000c0 RDI: 0000000000000000 [ 25.320753] RBP: 00000000006ca018 R08: 0000000020000540 R09: 00000000004002c8 [ 25.328027] R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000401a00 [ 25.335291] R13: 0000000000401a90 R14: 0000000000000000 R15: 0000000000000000 [ 25.342667] BUG: unable to handle kernel NULL pointer dereference at 0000000000000074 [ 25.350627] PGD 1abe54067 P4D 1abe54067 PUD 1abe5c067 PMD 0 [ 25.356437] Oops: 0000 [#1] SMP KASAN [ 25.360240] CPU: 1 PID: 4497 Comm: syz-executor673 Tainted: G W 4.18.0-rc4-next-20180711+ #4 [ 25.370099] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 25.379445] RIP: 0010:kfree+0xb2/0x260 [ 25.383315] 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 bb a3 ff 49 63 75 74 48 89 df e8 69 9e a9 01 4c [ 25.402432] RSP: 0018:ffff8801ac20f5d0 EFLAGS: 00010046 [ 25.407797] RAX: ffffea000022f488 RBX: ffffffff88bd24d4 RCX: ffffea000022f487 [ 25.415049] RDX: ffffea000022f480 RSI: ffffffff877046e0 RDI: ffffffff88bd24d4 [ 25.422307] RBP: ffff8801ac20f5f0 R08: ffff8801abef22c0 R09: ffffed0035841df8 [ 25.429558] R10: ffffed003581881b R11: 0000000000000001 R12: 0000000000000282 [ 25.436814] R13: 0000000000000000 R14: ffff8801ac20f740 R15: ffff8801ac360380 [ 25.444081] FS: 00000000007e0880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 25.452292] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 25.458164] CR2: 0000000000000074 CR3: 00000001abfb1000 CR4: 00000000001406e0 [ 25.465437] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 25.472694] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 25.479971] Call Trace: [ 25.482550] p9_client_create+0xfea/0x1770 [ 25.486777] ? p9_client_read+0xc60/0xc60 [ 25.490910] ? lock_acquire+0x1e4/0x540 [ 25.494872] ? lock_acquire+0x1e4/0x540 [ 25.498833] ? fs_reclaim_acquire+0x20/0x20 [ 25.503147] ? lock_release+0xa30/0xa30 [ 25.507109] ? __lockdep_init_map+0x105/0x590 [ 25.511589] ? kasan_check_write+0x14/0x20 [ 25.515809] ? __init_rwsem+0x1cc/0x2a0 [ 25.519783] ? do_raw_write_unlock.cold.8+0x49/0x49 [ 25.524781] ? __kmalloc_track_caller+0x311/0x760 [ 25.529617] ? save_stack+0xa9/0xd0 [ 25.533235] ? save_stack+0x43/0xd0 [ 25.536846] ? kasan_kmalloc+0xc4/0xe0 [ 25.540726] ? kmem_cache_alloc_trace+0x152/0x780 [ 25.545558] ? memcpy+0x45/0x50 [ 25.548828] v9fs_session_init+0x21a/0x1a80 [ 25.553141] ? rcu_note_context_switch+0x730/0x730 [ 25.558065] ? do_mount+0x69e/0x1fb0 [ 25.561765] ? lock_acquire+0x1e4/0x540 [ 25.565723] ? v9fs_show_options+0x7e0/0x7e0 [ 25.570120] ? lock_release+0xa30/0xa30 [ 25.574098] ? check_same_owner+0x340/0x340 [ 25.578683] ? lock_downgrade+0x8f0/0x8f0 [ 25.582837] ? kasan_unpoison_shadow+0x35/0x50 [ 25.587422] ? kasan_kmalloc+0xc4/0xe0 [ 25.591324] ? kmem_cache_alloc_trace+0x318/0x780 [ 25.596174] ? kasan_unpoison_shadow+0x35/0x50 [ 25.600739] ? kasan_kmalloc+0xc4/0xe0 [ 25.604711] v9fs_mount+0x7c/0x900 [ 25.608330] ? v9fs_drop_inode+0x150/0x150 [ 25.612555] legacy_get_tree+0x118/0x440 [ 25.616621] vfs_get_tree+0x1cb/0x5c0 [ 25.620426] do_mount+0x6c1/0x1fb0 [ 25.623953] ? check_same_owner+0x340/0x340 [ 25.628263] ? lock_release+0xa30/0xa30 [ 25.632227] ? copy_mount_string+0x40/0x40 [ 25.636470] ? kasan_kmalloc+0xc4/0xe0 [ 25.640358] ? kmem_cache_alloc_trace+0x318/0x780 [ 25.645197] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 25.650756] ? _copy_from_user+0xdf/0x150 [ 25.654997] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 25.660538] ? copy_mount_options+0x285/0x380 [ 25.665034] ksys_mount+0x12d/0x140 [ 25.668662] __x64_sys_mount+0xbe/0x150 [ 25.672622] do_syscall_64+0x1b9/0x820 [ 25.676500] ? syscall_return_slowpath+0x5e0/0x5e0 [ 25.681424] ? syscall_return_slowpath+0x31d/0x5e0 [ 25.686359] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 25.691374] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 25.696904] ? prepare_exit_to_usermode+0x291/0x3b0 [ 25.701911] ? perf_trace_sys_enter+0xb10/0xb10 [ 25.706564] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 25.711400] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 25.716699] RIP: 0033:0x440179 [ 25.719875] 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 [ 25.739036] RSP: 002b:00007ffd790b72b8 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5 [ 25.746750] RAX: ffffffffffffffda RBX: 0030656c69662f2e RCX: 0000000000440179 [ 25.754027] RDX: 0000000020000340 RSI: 00000000200000c0 RDI: 0000000000000000 [ 25.761314] RBP: 00000000006ca018 R08: 0000000020000540 R09: 00000000004002c8 [ 25.768580] R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000401a00 [ 25.775842] R13: 0000000000401a90 R14: 0000000000000000 R15: 0000000000000000 [ 25.783116] Modules linked in: [ 25.786306] Dumping ftrace buffer: [ 25.789843] (ftrace buffer empty) [ 25.793556] CR2: 0000000000000074 [ 25.797002] ---[ end trace f22a7f95611cbb18 ]--- [ 25.801775] RIP: 0010:kfree+0xb2/0x260 [ 25.805646] 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 bb a3 ff 49 63 75 74 48 89 df e8 69 9e a9 01 4c [ 25.825043] RSP: 0018:ffff8801ac20f5d0 EFLAGS: 00010046 [ 25.830423] RAX: ffffea000022f488 RBX: ffffffff88bd24d4 RCX: ffffea000022f487 [ 25.837887] RDX: ffffea000022f480 RSI: ffffffff877046e0 RDI: ffffffff88bd24d4 [ 25.845160] RBP: ffff8801ac20f5f0 R08: ffff8801abef22c0 R09: ffffed0035841df8 [ 25.852439] R10: ffffed003581881b R11: 0000000000000001 R12: 0000000000000282 [ 25.859696] R13: 0000000000000000 R14: ffff8801ac20f740 R15: ffff8801ac360380 [ 25.866960] FS: 00000000007e0880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 25.875288] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 25.881168] CR2: 0000000000000074 CR3: 00000001abfb1000 CR4: 00000000001406e0 [ 25.888428] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 25.895691] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 25.902964] Kernel panic - not syncing: Fatal exception [ 25.908865] Dumping ftrace buffer: [ 25.912411] (ftrace buffer empty) [ 25.916116] Kernel Offset: disabled [ 25.919731] Rebooting in 86400 seconds..