Warning: Permanently added '10.128.0.193' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 39.815042] audit: type=1400 audit(1601851949.391:8): avc: denied { execmem } for pid=6500 comm="syz-executor001" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1 [ 39.819177] ================================================================================ [ 39.845142] UBSAN: Undefined behaviour in net/sunrpc/xprt.c:568:22 [ 39.851929] shift exponent 536871552 is too large for 64-bit type 'long unsigned int' [ 39.859909] CPU: 1 PID: 6500 Comm: syz-executor001 Not tainted 4.19.149-syzkaller #0 [ 39.868211] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 39.878003] Call Trace: [ 39.880593] dump_stack+0x22c/0x33e [ 39.884618] ubsan_epilogue+0xe/0x3a [ 39.888531] __ubsan_handle_shift_out_of_bounds.cold+0x1c4/0x250 [ 39.894823] ? lock_downgrade+0x750/0x750 [ 39.899251] ? lock_acquire+0x170/0x3f0 [ 39.903312] ? xprt_do_reserve+0x230/0x530 [ 39.907543] xprt_reset_majortimeo+0x2f8/0x3b0 [ 39.912327] ? call_bc_transmit+0x520/0x520 [ 39.916644] xprt_do_reserve+0x438/0x530 [ 39.920871] xprt_reserve+0x129/0x1f0 [ 39.924673] __rpc_execute+0x1f7/0xb80 [ 39.928564] ? rpc_exit+0x1c0/0x1c0 [ 39.932315] ? check_preemption_disabled+0x41/0x2b0 [ 39.937468] rpc_execute+0x242/0x370 [ 39.941301] ? do_raw_spin_unlock+0x171/0x240 [ 39.945970] rpc_run_task+0x4e3/0x6a0 [ 39.949924] rpc_call_sync+0xb8/0x190 [ 39.953886] ? rpc_run_task+0x6a0/0x6a0 [ 39.957860] ? unx_create+0x16/0x30 [ 39.961874] ? rpc_client_register+0x42d/0x6c0 [ 39.966971] rpc_ping+0xb5/0x110 [ 39.970394] ? rpc_call_sync+0x190/0x190 [ 39.974617] ? rpc_new_client+0x742/0xa90 [ 39.978955] rpc_create_xprt+0x313/0x3c0 [ 39.983077] rpc_create+0x31e/0x540 [ 39.986964] ? rpc_create_xprt+0x3c0/0x3c0 [ 39.991200] ? check_preemption_disabled+0x41/0x2b0 [ 39.996352] ? mark_held_locks+0xf0/0xf0 [ 40.000518] nfs_create_rpc_client+0x36f/0x440 [ 40.005101] ? nfs_mark_client_ready+0x50/0x50 [ 40.009772] ? lock_downgrade+0x750/0x750 [ 40.014218] nfs_init_client+0x6d/0x100 [ 40.018577] nfs_get_client+0xf9f/0x13e0 [ 40.022642] ? _raw_spin_unlock_irqrestore+0x7d/0xf0 [ 40.027904] nfs_init_server+0x249/0xe10 [ 40.032172] ? nfs_get_client+0x13e0/0x13e0 [ 40.036785] ? check_preemption_disabled+0x41/0x2b0 [ 40.041897] ? kmem_cache_alloc_trace+0x379/0x4b0 [ 40.046739] ? __rpc_init_priority_wait_queue+0x251/0x380 [ 40.052455] nfs_create_server+0x7a/0x4f0 [ 40.056772] ? __lock_acquire+0x6ec/0x3ff0 [ 40.061229] nfs3_create_server+0x1a/0x1b0 [ 40.065693] nfs_try_mount+0x172/0x940 [ 40.069746] ? find_held_lock+0x2d/0x110 [ 40.074195] ? nfs_request_mount.constprop.0+0x5f0/0x5f0 [ 40.079772] ? get_nfs_version+0xc7/0x2f0 [ 40.083913] ? lock_downgrade+0x750/0x750 [ 40.088157] ? lock_acquire+0x170/0x3f0 [ 40.092129] ? get_nfs_version+0x1a/0x2f0 [ 40.096273] ? __kmalloc_track_caller+0x431/0x4e0 [ 40.101230] ? do_raw_spin_unlock+0x171/0x240 [ 40.105747] nfs_fs_mount+0x171f/0x2e8e [ 40.109783] ? nfs_remount+0x18f0/0x18f0 [ 40.114104] ? nfs_clone_super+0x400/0x400 [ 40.118431] ? param_set_portnr+0x160/0x160 [ 40.122752] ? __lockdep_init_map+0x100/0x5c0 [ 40.127251] mount_fs+0xa3/0x318 [ 40.130619] vfs_kern_mount.part.0+0x68/0x470 [ 40.135118] do_mount+0x51c/0x2f10 [ 40.138839] ? do_raw_spin_unlock+0x171/0x240 [ 40.143351] ? check_preemption_disabled+0x41/0x2b0 [ 40.148361] ? copy_mount_string+0x40/0x40 [ 40.152774] ? kmem_cache_alloc_trace+0x379/0x4b0 [ 40.157866] ? copy_mount_options+0x261/0x370 [ 40.162651] ksys_mount+0xcf/0x130 [ 40.166279] __x64_sys_mount+0xba/0x150 [ 40.171419] ? lockdep_hardirqs_on+0x3c1/0x5e0 [ 40.176123] do_syscall_64+0xf9/0x670 [ 40.179959] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 40.185390] RIP: 0033:0x4403d9 [ 40.188583] 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 7b 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 40.207907] RSP: 002b:00007fff715b1ad8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 [ 40.215982] RAX: ffffffffffffffda RBX: 0030656c69662f2e RCX: 00000000004403d9 [ 40.223559] RDX: 0000000020000200 RSI: 00000000200001c0 RDI: 0000000000000000 [ 40.231000] RBP: 00000000006ca018 R08: 0000000020000000 R09: 0000000000000000 [ 40.238734] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401be0 [ 40.246089] R13: 0000000000401c70 R14: 0000000000000000 R15: 0000000000000000 [ 40.253786] ================================================================================