[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 16.309258] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 20.924484] random: sshd: uninitialized urandom read (32 bytes read) [ 21.161398] random: sshd: uninitialized urandom read (32 bytes read) [ 21.836106] random: sshd: uninitialized urandom read (32 bytes read) [ 21.969974] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.12' (ECDSA) to the list of known hosts. [ 27.423715] random: sshd: uninitialized urandom read (32 bytes read) executing program executing program [ 27.532658] kasan: CONFIG_KASAN_INLINE enabled [ 27.537325] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 27.544708] general protection fault: 0000 [#1] SMP KASAN [ 27.550244] CPU: 0 PID: 4474 Comm: syz-executor715 Not tainted 4.18.0-rc3+ #55 [ 27.557585] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.566976] RIP: 0010:bpf_tcp_close+0x94c/0x1050 [ 27.571720] Code: 85 25 06 00 00 48 8d 95 18 ff ff ff 49 8b 4c 24 18 48 89 d6 48 c1 ee 03 c6 04 1e 00 48 89 ce 48 c1 ee 03 48 89 85 18 ff ff ff <80> 3c 1e 00 0f 85 bf 05 00 00 48 c1 ea 03 48 85 c0 48 89 01 48 89 [ 27.590875] RSP: 0018:ffff8801c5da7950 EFLAGS: 00010a02 [ 27.596231] RAX: 0000000000000000 RBX: dffffc0000000000 RCX: dead000000000200 [ 27.603486] RDX: ffff8801c5da7a40 RSI: 1bd5a00000000040 RDI: ffff8801d3175790 [ 27.610748] RBP: ffff8801c5da7b28 R08: ffff8801b3c50540 R09: ffffed003a62eb11 [ 27.618001] R10: ffffed003a62eb11 R11: ffff8801d317588b R12: ffff8801d3175780 [ 27.625614] R13: ffff8801aad5d800 R14: ffff8801d3175888 R15: ffff8801d3175798 [ 27.632881] FS: 00000000018e5880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 27.641215] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 27.647089] CR2: 00007f9b79d7fe78 CR3: 00000001aba3d000 CR4: 00000000001406f0 [ 27.654353] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 27.661698] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 27.669635] Call Trace: [ 27.672254] ? tcp_check_oom+0x530/0x530 [ 27.676336] ? sock_hash_free+0x6a0/0x6a0 [ 27.680501] ? lock_acquire+0x1e4/0x540 [ 27.684468] ? __sock_release+0x8b/0x260 [ 27.688520] ? lock_release+0xa30/0xa30 [ 27.692496] ? perf_trace_lock+0x920/0x920 [ 27.696718] ? rcu_note_context_switch+0x730/0x730 [ 27.701639] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 27.707162] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 27.712686] ? ipv6_sock_ac_close+0x356/0x490 [ 27.717185] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 27.722727] ? ipv6_sock_mc_close+0x162/0x1d0 [ 27.727206] ? ip_mc_drop_socket+0x20f/0x270 [ 27.731598] ? down_write+0x8f/0x130 [ 27.735308] inet_release+0x104/0x1f0 [ 27.739093] inet6_release+0x50/0x70 [ 27.742795] __sock_release+0xd7/0x260 [ 27.746668] ? __sock_release+0x260/0x260 [ 27.750799] sock_close+0x19/0x20 [ 27.754246] __fput+0x355/0x8b0 [ 27.757517] ? fput+0x1a0/0x1a0 [ 27.760794] ? kasan_check_write+0x14/0x20 [ 27.765042] ? do_raw_spin_lock+0xc1/0x200 [ 27.769288] ____fput+0x15/0x20 [ 27.772555] task_work_run+0x1ec/0x2a0 [ 27.776455] ? task_work_cancel+0x250/0x250 [ 27.780860] ? copy_fd_bitmaps+0x210/0x210 [ 27.785092] exit_to_usermode_loop+0x313/0x370 [ 27.789751] ? syscall_slow_exit_work+0x500/0x500 [ 27.794594] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 27.800121] do_syscall_64+0x6be/0x820 [ 27.803996] ? syscall_return_slowpath+0x5e0/0x5e0 [ 27.808916] ? syscall_return_slowpath+0x31d/0x5e0 [ 27.814008] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 27.819009] ? prepare_exit_to_usermode+0x291/0x3b0 [ 27.824011] ? perf_trace_sys_enter+0xb10/0xb10 [ 27.828665] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 27.833507] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 27.838681] RIP: 0033:0x405781 [ 27.841851] Code: 75 14 b8 03 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 54 17 00 00 c3 48 83 ec 08 e8 6a fc ff ff 48 89 04 24 b8 03 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 b3 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01 [ 27.861025] RSP: 002b:00007fff3d5e3680 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 [ 27.868717] RAX: 0000000000000000 RBX: 0000000000000004 RCX: 0000000000405781 [ 27.875969] RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000004 [ 27.883226] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 [ 27.890482] R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000006b70 [ 27.897744] R13: 00000000004073d0 R14: 0000000000000000 R15: 0000000000000000 [ 27.904999] Modules linked in: [ 27.908185] Dumping ftrace buffer: [ 27.911703] (ftrace buffer empty) [ 27.915498] ---[ end trace 24c47acbb9ad1d76 ]--- [ 27.920277] RIP: 0010:bpf_tcp_close+0x94c/0x1050 [ 27.925127] Code: 85 25 06 00 00 48 8d 95 18 ff ff ff 49 8b 4c 24 18 48 89 d6 48 c1 ee 03 c6 04 1e 00 48 89 ce 48 c1 ee 03 48 89 85 18 ff ff ff <80> 3c 1e 00 0f 85 bf 05 00 00 48 c1 ea 03 48 85 c0 48 89 01 48 89 [ 27.944352] RSP: 0018:ffff8801c5da7950 EFLAGS: 00010a02 [ 27.949721] RAX: 0000000000000000 RBX: dffffc0000000000 RCX: dead000000000200 [ 27.957018] RDX: ffff8801c5da7a40 RSI: 1bd5a00000000040 RDI: ffff8801d3175790 [ 27.964309] RBP: ffff8801c5da7b28 R08: ffff8801b3c50540 R09: ffffed003a62eb11 [ 27.971589] R10: ffffed003a62eb11 R11: ffff8801d317588b R12: ffff8801d3175780 [ 27.978862] R13: ffff8801aad5d800 R14: ffff8801d3175888 R15: ffff8801d3175798 [ 27.986144] FS: 00000000018e5880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 27.994370] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 28.000978] CR2: 00007f9b79d7fe78 CR3: 00000001aba3d000 CR4: 00000000001406f0 [ 28.008265] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 28.015557] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 28.022834] Kernel panic - not syncing: Fatal exception in interrupt [ 28.029879] Dumping ftrace buffer: [ 28.033405] (ftrace buffer empty) [ 28.037349] Kernel Offset: disabled [ 28.041064] Rebooting in 86400 seconds..