[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 16.196642] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.144183] random: sshd: uninitialized urandom read (32 bytes read) [ 21.476518] random: sshd: uninitialized urandom read (32 bytes read) [ 22.152725] random: sshd: uninitialized urandom read (32 bytes read) [ 22.283277] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.23' (ECDSA) to the list of known hosts. [ 27.744391] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 27.827347] ------------[ cut here ]------------ [ 27.832126] kernel BUG at mm/slab.c:4421! [ 27.836290] invalid opcode: 0000 [#1] SMP KASAN [ 27.840949] CPU: 0 PID: 4467 Comm: syz-executor607 Not tainted 4.18.0-rc3+ #48 [ 27.848310] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.857655] RIP: 0010:__check_heap_object+0xa7/0xb5 [ 27.862647] Code: 48 c7 c7 90 73 c0 88 e8 87 7a 08 00 5d c3 41 8b 91 04 01 00 00 48 29 c7 48 39 d7 77 be 48 01 d0 48 29 c8 48 39 f0 72 b3 5d c3 <0f> 0b 48 c7 c7 90 73 c0 88 e8 6d 81 08 00 44 89 e1 4c 8d 45 c4 48 [ 27.881863] RSP: 0018:ffff8801ab117a10 EFLAGS: 00010246 [ 27.887208] RAX: 0000000000000006 RBX: 1ffff10035622f49 RCX: 0000000000000009 [ 27.894458] RDX: ffff8801c27ff000 RSI: 00000000000003d2 RDI: ffff8801c27ffff2 [ 27.901708] RBP: ffff8801ab117a10 R08: ffff8801ab37a680 R09: ffff8801da800940 [ 27.908964] R10: 0000000000000991 R11: 0000000000000001 R12: ffff8801c27ffff2 [ 27.916219] R13: 00000000000003d2 R14: 0000000000000001 R15: ffffea000709ffc0 [ 27.923468] FS: 0000000000763880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 27.931678] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 27.937536] CR2: 0000000020000200 CR3: 00000001b0a8b000 CR4: 00000000001406f0 [ 27.944794] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 27.952044] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 27.959290] Call Trace: [ 27.961873] __check_object_size+0x4db/0x5f2 [ 27.966275] ? usercopy_warn+0x120/0x120 [ 27.970336] ? kvm_clock_read+0x25/0x30 [ 27.974300] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 27.979302] bpf_test_finish.isra.7+0xd9/0x1f0 [ 27.983866] ? bpf_test_init.isra.8+0x100/0x100 [ 27.988518] ? bpf_test_run+0x2fc/0x3b0 [ 27.992476] bpf_prog_test_run_skb+0x7d7/0xa30 [ 27.997050] ? bpf_test_finish.isra.7+0x1f0/0x1f0 [ 28.001880] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 28.007400] ? __bpf_prog_get+0x9b/0x290 [ 28.011808] ? bpf_test_finish.isra.7+0x1f0/0x1f0 [ 28.016633] bpf_prog_test_run+0x130/0x1a0 [ 28.020851] __x64_sys_bpf+0x3d8/0x510 [ 28.024717] ? bpf_prog_get+0x20/0x20 [ 28.028501] ? do_page_fault+0xf6/0x8c0 [ 28.032457] do_syscall_64+0x1b9/0x820 [ 28.036325] ? syscall_return_slowpath+0x5e0/0x5e0 [ 28.041238] ? syscall_return_slowpath+0x31d/0x5e0 [ 28.046151] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 28.051150] ? prepare_exit_to_usermode+0x291/0x3b0 [ 28.056160] ? perf_trace_sys_enter+0xb10/0xb10 [ 28.060822] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 28.065658] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 28.070832] RIP: 0033:0x4402d9 [ 28.074000] 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 [ 28.093172] RSP: 002b:00007fff168c6558 EFLAGS: 00000213 ORIG_RAX: 0000000000000141 [ 28.100868] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 00000000004402d9 [ 28.108130] RDX: 0000000000000028 RSI: 0000000020000080 RDI: 000000000000000a [ 28.115385] RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8 [ 28.122639] R10: 0000000000000000 R11: 0000000000000213 R12: 0000000000401b60 [ 28.129888] R13: 0000000000401bf0 R14: 0000000000000000 R15: 0000000000000000 [ 28.137160] Modules linked in: [ 28.140334] Dumping ftrace buffer: [ 28.143852] (ftrace buffer empty) [ 28.147602] ---[ end trace 045402f983996608 ]--- [ 28.152387] RIP: 0010:__check_heap_object+0xa7/0xb5 [ 28.157421] Code: 48 c7 c7 90 73 c0 88 e8 87 7a 08 00 5d c3 41 8b 91 04 01 00 00 48 29 c7 48 39 d7 77 be 48 01 d0 48 29 c8 48 39 f0 72 b3 5d c3 <0f> 0b 48 c7 c7 90 73 c0 88 e8 6d 81 08 00 44 89 e1 4c 8d 45 c4 48 [ 28.176770] RSP: 0018:ffff8801ab117a10 EFLAGS: 00010246 [ 28.182161] RAX: 0000000000000006 RBX: 1ffff10035622f49 RCX: 0000000000000009 [ 28.189442] RDX: ffff8801c27ff000 RSI: 00000000000003d2 RDI: ffff8801c27ffff2 [ 28.196721] RBP: ffff8801ab117a10 R08: ffff8801ab37a680 R09: ffff8801da800940 [ 28.204029] R10: 0000000000000991 R11: 0000000000000001 R12: ffff8801c27ffff2 [ 28.211314] R13: 00000000000003d2 R14: 0000000000000001 R15: ffffea000709ffc0 [ 28.218593] FS: 0000000000763880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 28.226823] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 28.232705] CR2: 0000000020000200 CR3: 00000001b0a8b000 CR4: 00000000001406f0 [ 28.239996] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 28.247276] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 28.254552] Kernel panic - not syncing: Fatal exception [ 28.260432] Dumping ftrace buffer: [ 28.263952] (ftrace buffer empty) [ 28.267651] Kernel Offset: disabled [ 28.271267] Rebooting in 86400 seconds..