[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 18.822228] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 24.510243] random: sshd: uninitialized urandom read (32 bytes read) [ 24.857912] random: sshd: uninitialized urandom read (32 bytes read) [ 25.696952] random: sshd: uninitialized urandom read (32 bytes read) [ 25.851516] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.39' (ECDSA) to the list of known hosts. [ 31.368903] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 31.459608] BUG: unable to handle kernel paging request at ffffebe000000008 [ 31.466737] PGD 0 P4D 0 [ 31.469395] Oops: 0000 [#1] SMP KASAN [ 31.473177] CPU: 0 PID: 4499 Comm: syz-executor074 Not tainted 4.18.0-rc4+ #142 [ 31.480605] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.489955] RIP: 0010:kfree+0xa0/0x260 [ 31.493815] Code: 82 cb 01 00 00 48 ba 00 00 00 80 ff 77 00 00 48 01 c2 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 [ 31.512935] RSP: 0018:ffff8801b1a47520 EFLAGS: 00010086 [ 31.518287] RAX: ffffea0000000000 RBX: 0000000000000286 RCX: 0000000000000000 [ 31.525550] RDX: ffffebe000000000 RSI: 0000000000000000 RDI: 0000000000000286 [ 31.532807] RBP: ffff8801b1a47540 R08: ffffed003b5c46d7 R09: ffffed003b5c46d6 [ 31.540058] R10: ffffed003b5c46d6 R11: ffff8801dae236b3 R12: 0000000000000286 [ 31.547313] R13: ffffffff8766d6c3 R14: ffff8801b1a47690 R15: ffff8801b1440380 [ 31.554566] FS: 0000000002370880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 31.562922] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 31.568782] CR2: ffffebe000000008 CR3: 00000001b2698000 CR4: 00000000001406f0 [ 31.576041] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 31.583301] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 31.590556] Call Trace: [ 31.593130] p9_client_create+0xf43/0x16c9 [ 31.597358] ? p9_client_read+0xc60/0xc60 [ 31.601488] ? find_held_lock+0x36/0x1c0 [ 31.605543] ? __lockdep_init_map+0x105/0x590 [ 31.610029] ? kasan_check_write+0x14/0x20 [ 31.614247] ? __init_rwsem+0x1cc/0x2a0 [ 31.618203] ? do_raw_write_unlock.cold.8+0x49/0x49 [ 31.623210] ? rcu_read_lock_sched_held+0x108/0x120 [ 31.628216] ? __kmalloc_track_caller+0x5f5/0x760 [ 31.633042] ? save_stack+0xa9/0xd0 [ 31.636657] ? save_stack+0x43/0xd0 [ 31.640268] ? kasan_kmalloc+0xc4/0xe0 [ 31.644146] ? kmem_cache_alloc_trace+0x152/0x780 [ 31.648977] ? memcpy+0x45/0x50 [ 31.652238] v9fs_session_init+0x21a/0x1a80 [ 31.656540] ? find_held_lock+0x36/0x1c0 [ 31.660591] ? v9fs_show_options+0x7e0/0x7e0 [ 31.664981] ? kasan_check_read+0x11/0x20 [ 31.669111] ? rcu_is_watching+0x8c/0x150 [ 31.673248] ? rcu_pm_notify+0xc0/0xc0 [ 31.677121] ? v9fs_mount+0x61/0x900 [ 31.680835] ? rcu_read_lock_sched_held+0x108/0x120 [ 31.685841] ? kmem_cache_alloc_trace+0x616/0x780 [ 31.690674] ? __sanitizer_cov_trace_const_cmp2+0x18/0x20 [ 31.696200] v9fs_mount+0x7c/0x900 [ 31.699720] mount_fs+0xae/0x328 [ 31.703074] vfs_kern_mount.part.34+0xdc/0x4e0 [ 31.707637] ? may_umount+0xb0/0xb0 [ 31.711246] ? _raw_read_unlock+0x22/0x30 [ 31.715374] ? __get_fs_type+0x97/0xc0 [ 31.719251] do_mount+0x581/0x30e0 [ 31.722770] ? copy_mount_string+0x40/0x40 [ 31.726985] ? copy_mount_options+0x5f/0x380 [ 31.731388] ? rcu_read_lock_sched_held+0x108/0x120 [ 31.736385] ? kmem_cache_alloc_trace+0x616/0x780 [ 31.741218] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 31.746742] ? _copy_from_user+0xdf/0x150 [ 31.750869] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 31.756386] ? copy_mount_options+0x285/0x380 [ 31.760862] ksys_mount+0x12d/0x140 [ 31.764480] __x64_sys_mount+0xbe/0x150 [ 31.768442] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 31.773437] do_syscall_64+0x1b9/0x820 [ 31.777315] ? syscall_return_slowpath+0x5e0/0x5e0 [ 31.782231] ? syscall_return_slowpath+0x31d/0x5e0 [ 31.787139] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 31.792657] ? retint_user+0x18/0x18 [ 31.796351] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 31.801174] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 31.806343] RIP: 0033:0x440179 [ 31.809508] 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 [ 31.828628] RSP: 002b:00007ffc87a28408 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5 [ 31.836318] RAX: ffffffffffffffda RBX: 0030656c69662f2e RCX: 0000000000440179 [ 31.843574] RDX: 0000000020000340 RSI: 00000000200000c0 RDI: 0000000000000000 [ 31.850828] RBP: 00000000006ca018 R08: 0000000020000540 R09: 00000000004002c8 [ 31.858076] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000401a00 [ 31.865321] R13: 0000000000401a90 R14: 0000000000000000 R15: 0000000000000000 [ 31.872572] Modules linked in: [ 31.875754] Dumping ftrace buffer: [ 31.879276] (ftrace buffer empty) [ 31.882967] CR2: ffffebe000000008 [ 31.886397] ---[ end trace fea0c3a5be616332 ]--- [ 31.891136] RIP: 0010:kfree+0xa0/0x260 [ 31.894996] Code: 82 cb 01 00 00 48 ba 00 00 00 80 ff 77 00 00 48 01 c2 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 [ 31.914131] RSP: 0018:ffff8801b1a47520 EFLAGS: 00010086 [ 31.919475] RAX: ffffea0000000000 RBX: 0000000000000286 RCX: 0000000000000000 [ 31.926724] RDX: ffffebe000000000 RSI: 0000000000000000 RDI: 0000000000000286 [ 31.933979] RBP: ffff8801b1a47540 R08: ffffed003b5c46d7 R09: ffffed003b5c46d6 [ 31.941228] R10: ffffed003b5c46d6 R11: ffff8801dae236b3 R12: 0000000000000286 [ 31.948475] R13: ffffffff8766d6c3 R14: ffff8801b1a47690 R15: ffff8801b1440380 [ 31.955727] FS: 0000000002370880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 31.963932] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 31.969795] CR2: ffffebe000000008 CR3: 00000001b2698000 CR4: 00000000001406f0 [ 31.977048] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 31.984297] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 31.991559] Kernel panic - not syncing: Fatal exception [ 31.997395] Dumping ftrace buffer: [ 32.000912] (ftrace buffer empty) [ 32.004608] Kernel Offset: disabled [ 32.008214] Rebooting in 86400 seconds..