[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 16.007171] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 18.527849] random: sshd: uninitialized urandom read (32 bytes read) [ 18.930085] random: sshd: uninitialized urandom read (32 bytes read) [ 19.639874] random: sshd: uninitialized urandom read (32 bytes read) [ 19.780399] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.35' (ECDSA) to the list of known hosts. [ 25.273472] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 25.369110] WARNING: CPU: 0 PID: 4458 at mm/slab_common.c:1031 kmalloc_slab+0x56/0x70 [ 25.377129] Kernel panic - not syncing: panic_on_warn set ... [ 25.377129] [ 25.384488] CPU: 0 PID: 4458 Comm: syz-executor537 Not tainted 4.18.0-rc5-next-20180717+ #9 [ 25.392957] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 25.402289] Call Trace: [ 25.404867] dump_stack+0x1c9/0x2b4 [ 25.408481] ? dump_stack_print_info.cold.2+0x52/0x52 [ 25.413665] panic+0x238/0x4e7 [ 25.416838] ? add_taint.cold.5+0x16/0x16 [ 25.420969] ? __warn.cold.8+0x148/0x1ba [ 25.425015] ? __warn.cold.8+0x117/0x1ba [ 25.429066] ? kmalloc_slab+0x56/0x70 [ 25.432846] __warn.cold.8+0x163/0x1ba [ 25.436712] ? kmalloc_slab+0x56/0x70 [ 25.440497] report_bug+0x252/0x2d0 [ 25.444145] do_error_trap+0x1fc/0x4d0 [ 25.448024] ? p9_fcall_alloc+0x90/0x90 [ 25.452003] ? p9_client_zc_rpc.constprop.11+0x1560/0x1560 [ 25.457627] ? math_error+0x3e0/0x3e0 [ 25.461412] ? p9_client_clunk+0xde/0x180 [ 25.465562] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 25.470393] do_invalid_op+0x1b/0x20 [ 25.474102] invalid_op+0x14/0x20 [ 25.477542] RIP: 0010:kmalloc_slab+0x56/0x70 [ 25.481922] Code: c5 c0 0a d1 88 5d c3 b8 10 00 00 00 48 85 ff 74 f4 83 ef 01 c1 ef 03 0f b6 87 e0 09 d1 88 eb d8 31 c0 81 e6 00 02 00 00 75 db <0f> 0b 5d c3 48 8b 04 c5 00 0a d1 88 5d c3 66 90 66 2e 0f 1f 84 00 [ 25.501069] RSP: 0018:ffff8801ace9f830 EFLAGS: 00010246 [ 25.506416] RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff81d0c52d [ 25.513670] RDX: ffffffff81d0c5c4 RSI: 0000000000000000 RDI: 000000002f2e0008 [ 25.520926] RBP: ffff8801ace9f830 R08: ffff8801ac920700 R09: fffffbfff125691c [ 25.528182] R10: fffffbfff125691c R11: ffffffff892b48e3 R12: 000000002f2e0008 [ 25.535440] R13: 0000000000600040 R14: ffff8801ace9f998 R15: 0000000000600040 [ 25.542717] ? vfs_getxattr_alloc+0x1dd/0x3c0 [ 25.547195] ? vfs_getxattr_alloc+0x274/0x3c0 [ 25.551693] __kmalloc_track_caller+0x21/0x760 [ 25.556261] ? vfs_getxattr_alloc+0x274/0x3c0 [ 25.560749] krealloc+0x65/0xb0 [ 25.564032] vfs_getxattr_alloc+0x274/0x3c0 [ 25.568344] ? path_setxattr+0x230/0x230 [ 25.572401] ? lock_acquire+0x1e4/0x540 [ 25.576358] ? fs_reclaim_acquire+0x20/0x20 [ 25.580660] ? lock_downgrade+0x8f0/0x8f0 [ 25.584798] cap_inode_getsecurity+0x104/0x820 [ 25.589358] ? rootid_owns_currentns+0x1d0/0x1d0 [ 25.594103] ? kasan_unpoison_shadow+0x35/0x50 [ 25.598669] ? kasan_kmalloc+0xc4/0xe0 [ 25.602537] security_inode_getsecurity+0xe1/0x130 [ 25.607446] vfs_getxattr+0x1db/0x390 [ 25.611225] ? xattr_permission+0x310/0x310 [ 25.615524] ? __kmalloc_node+0x47/0x70 [ 25.619477] getxattr+0x139/0x2c0 [ 25.622908] ? path_listxattr+0x1a0/0x1a0 [ 25.627045] ? mpi_free.cold.1+0x19/0x19 [ 25.631089] ? _raw_spin_unlock_irqrestore+0x63/0xc0 [ 25.636174] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 25.641691] ? getname_flags+0x26e/0x5a0 [ 25.645735] path_getxattr+0x103/0x1b0 [ 25.649623] ? __kasan_slab_free+0x131/0x170 [ 25.654013] ? getxattr+0x2c0/0x2c0 [ 25.657624] ? ksys_mount+0xa8/0x140 [ 25.661323] __x64_sys_getxattr+0x9d/0x100 [ 25.665538] do_syscall_64+0x1b9/0x820 [ 25.669405] ? syscall_return_slowpath+0x5e0/0x5e0 [ 25.674313] ? syscall_return_slowpath+0x31d/0x5e0 [ 25.679221] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 25.684219] ? prepare_exit_to_usermode+0x291/0x3b0 [ 25.689218] ? perf_trace_sys_enter+0xb10/0xb10 [ 25.693873] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 25.698701] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 25.703873] RIP: 0033:0x440559 [ 25.707043] 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 [ 25.726182] RSP: 002b:00007fff684abf58 EFLAGS: 00000217 ORIG_RAX: 00000000000000bf [ 25.733874] RAX: ffffffffffffffda RBX: 0030656c69662f2e RCX: 0000000000440559 [ 25.741135] RDX: 00000000200002c0 RSI: 0000000020000500 RDI: 00000000200004c0 [ 25.748388] RBP: 64663d736e617274 R08: 00007fff684ac0d8 R09: 00007fff684ac0d8 [ 25.755641] R10: 0000000000000143 R11: 0000000000000217 R12: 0000000000401de0 [ 25.762904] R13: 0000000000401e70 R14: 0000000000000000 R15: 0000000000000000 [ 25.770701] Dumping ftrace buffer: [ 25.774223] (ftrace buffer empty) [ 25.777918] Kernel Offset: disabled [ 25.781526] Rebooting in 86400 seconds..