[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[   18.741569] random: sshd: uninitialized urandom read (32 bytes read)
[?25l[?1c7[ ok 8[?25h[?0c.

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   22.464154] random: sshd: uninitialized urandom read (32 bytes read)
[   22.792646] random: sshd: uninitialized urandom read (32 bytes read)
[   23.675179] random: sshd: uninitialized urandom read (32 bytes read)
[   23.830785] random: sshd: uninitialized urandom read (32 bytes read)
Warning: Permanently added '10.128.15.205' (ECDSA) to the list of known hosts.
[   29.362929] random: sshd: uninitialized urandom read (32 bytes read)
executing program
[   29.455934] WARNING: CPU: 1 PID: 4528 at mm/slab_common.c:1031 kmalloc_slab+0x56/0x70
[   29.463930] Kernel panic - not syncing: panic_on_warn set ...
[   29.463930] 
[   29.471280] CPU: 1 PID: 4528 Comm: syz-executor989 Not tainted 4.18.0-rc5+ #154
[   29.478713] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   29.488044] Call Trace:
[   29.490614]  dump_stack+0x1c9/0x2b4
[   29.494230]  ? dump_stack_print_info.cold.2+0x52/0x52
[   29.499404]  panic+0x238/0x4e7
[   29.502578]  ? add_taint.cold.5+0x16/0x16
[   29.506706]  ? __warn.cold.8+0x148/0x1ba
[   29.510744]  ? __warn.cold.8+0x117/0x1ba
[   29.514787]  ? kmalloc_slab+0x56/0x70
[   29.518568]  __warn.cold.8+0x163/0x1ba
[   29.522445]  ? kmalloc_slab+0x56/0x70
[   29.526224]  report_bug+0x252/0x2d0
[   29.529831]  do_error_trap+0x1fc/0x4d0
[   29.533698]  ? p9_fcall_alloc+0x90/0x90
[   29.537652]  ? p9_client_zc_rpc.constprop.10+0x1560/0x1560
[   29.543258]  ? math_error+0x3e0/0x3e0
[   29.547041]  ? p9_client_clunk+0xde/0x180
[   29.551173]  ? trace_hardirqs_off_thunk+0x1a/0x1c
[   29.555996]  do_invalid_op+0x1b/0x20
[   29.559694]  invalid_op+0x14/0x20
[   29.563131] RIP: 0010:kmalloc_slab+0x56/0x70
[   29.567515] Code: c5 c0 1a d1 88 5d c3 b8 10 00 00 00 48 85 ff 74 f4 83 ef 01 c1 ef 03 0f b6 87 e0 19 d1 88 eb d8 31 c0 81 e6 00 02 00 00 75 db <0f> 0b 5d c3 48 8b 04 c5 00 1a d1 88 5d c3 66 90 66 2e 0f 1f 84 00 
[   29.586678] RSP: 0018:ffff8801ac167830 EFLAGS: 00010246
[   29.592030] RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff81cf0bed
[   29.599293] RDX: ffffffff81cf0c84 RSI: 0000000000000000 RDI: 000000002f2e0008
[   29.606569] RBP: ffff8801ac167830 R08: ffff8801ac1aa640 R09: 0000000000000000
[   29.613824] R10: 0000000000000000 R11: 0000000000000000 R12: 000000002f2e0008
[   29.621079] R13: 0000000000600040 R14: ffff8801ac167998 R15: 0000000000600040
[   29.628347]  ? vfs_getxattr_alloc+0x1dd/0x3c0
[   29.632824]  ? vfs_getxattr_alloc+0x274/0x3c0
[   29.637303]  __kmalloc_track_caller+0x21/0x760
[   29.641869]  ? vfs_getxattr_alloc+0x274/0x3c0
[   29.646346]  krealloc+0x65/0xb0
[   29.649619]  vfs_getxattr_alloc+0x274/0x3c0
[   29.653925]  ? path_setxattr+0x230/0x230
[   29.657974]  cap_inode_getsecurity+0x104/0x820
[   29.662537]  ? kasan_check_read+0x11/0x20
[   29.666668]  ? rootid_owns_currentns+0x1d0/0x1d0
[   29.671415]  security_inode_getsecurity+0xe1/0x130
[   29.676333]  vfs_getxattr+0x1db/0x390
[   29.680116]  ? xattr_permission+0x310/0x310
[   29.684418]  ? __kmalloc_node+0x47/0x70
[   29.688374]  getxattr+0x139/0x2c0
[   29.691809]  ? path_listxattr+0x1a0/0x1a0
[   29.695945]  ? mpi_free.cold.1+0x19/0x19
[   29.699990]  ? trace_hardirqs_off+0xd/0x10
[   29.704220]  ? _raw_spin_unlock_irqrestore+0x63/0xc0
[   29.709313]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[   29.714842]  ? getname_flags+0x26e/0x5a0
[   29.718893]  path_getxattr+0x103/0x1b0
[   29.722776]  ? getxattr+0x2c0/0x2c0
[   29.726387]  ? ksys_mount+0xa8/0x140
[   29.730090]  __x64_sys_getxattr+0x9d/0x100
[   29.734308]  do_syscall_64+0x1b9/0x820
[   29.738185]  ? syscall_return_slowpath+0x5e0/0x5e0
[   29.743097]  ? syscall_return_slowpath+0x31d/0x5e0
[   29.748018]  ? entry_SYSCALL_64_after_hwframe+0x59/0xbe
[   29.753372]  ? trace_hardirqs_off_thunk+0x1a/0x1c
[   29.758196]  entry_SYSCALL_64_after_hwframe+0x49/0xbe
[   29.763388] RIP: 0033:0x440559
[   29.766553] 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 
[   29.785721] RSP: 002b:00007fff9dcf30d8 EFLAGS: 00000217 ORIG_RAX: 00000000000000bf
[   29.793412] RAX: ffffffffffffffda RBX: 0030656c69662f2e RCX: 0000000000440559
[   29.800661] RDX: 00000000200002c0 RSI: 0000000020000500 RDI: 00000000200004c0
[   29.807908] RBP: 64663d736e617274 R08: 00007fff9dcf3258 R09: 00007fff9dcf3258
[   29.815155] R10: 0000000000000143 R11: 0000000000000217 R12: 0000000000401de0
[   29.822403] R13: 0000000000401e70 R14: 0000000000000000 R15: 0000000000000000
[   29.830235] Dumping ftrace buffer:
[   29.833860]    (ftrace buffer empty)
[   29.837551] Kernel Offset: disabled
[   29.841160] Rebooting in 86400 seconds..