[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 55.406735] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 57.426291] random: sshd: uninitialized urandom read (32 bytes read) [ 57.955086] random: sshd: uninitialized urandom read (32 bytes read) [ 59.287256] random: sshd: uninitialized urandom read (32 bytes read) [ 59.696576] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.11' (ECDSA) to the list of known hosts. [ 65.500979] random: sshd: uninitialized urandom read (32 bytes read) [ 65.686751] IPVS: ftp: loaded support on port[0] = 21 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 68.479318] Not allocated shadow for addr ffff88019f724c08 (page ffffea0009bcad80) [ 68.487087] Attempted to access 8 bytes [ 68.491088] ------------[ cut here ]------------ [ 68.495840] kernel BUG at mm/kmsan/kmsan.c:1114! [ 68.500610] invalid opcode: 0000 [#1] SMP PTI [ 68.505099] CPU: 1 PID: 4820 Comm: syz-executor133 Not tainted 4.19.0-rc4+ #56 [ 68.512447] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 68.521833] RIP: 0010:kmsan_get_shadow_address+0x2d6/0x3d0 [ 68.527468] Code: e9 89 00 00 00 c7 04 25 60 75 9e 8a 01 00 00 00 65 48 8b 04 25 80 fc 02 00 c6 80 f3 08 00 00 01 80 3c 25 78 75 9e 8a 00 74 0c <0f> 0b 0f 1f 84 00 00 00 00 00 eb fe 48 c7 c7 99 23 cb 89 31 c0 4c [ 68.546361] RSP: 0018:ffff8801aee6f780 EFLAGS: 00010086 [ 68.551718] RAX: 000000000000001b RBX: 0000000000000000 RCX: 0000000000000000 [ 68.559000] RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000000 [ 68.566263] RBP: ffff8801aee6f7b0 R08: 0000000000000000 R09: ffff88021fd39250 [ 68.573546] R10: 0000000000000000 R11: ffffffff8560abe0 R12: 0000000000000001 [ 68.580817] R13: ffff88019f724c08 R14: 0000000000000001 R15: 0000000000000008 [ 68.588098] FS: 0000000000a8c880(0000) GS:ffff88021fd00000(0000) knlGS:0000000000000000 [ 68.596312] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 68.602186] CR2: 00000000006d0138 CR3: 00000001b0102000 CR4: 00000000001406e0 [ 68.609478] Call Trace: [ 68.612089] kmsan_internal_unpoison_shadow+0x5c/0xe0 [ 68.617276] kmsan_unpoison_shadow+0x66/0xb0 [ 68.621719] vunmap_page_range+0x82e/0xc30 [ 68.626000] remove_vm_area+0x39b/0x450 [ 68.629997] __vunmap+0x34c/0x5d0 [ 68.633475] vfree+0x79/0x170 [ 68.636581] do_ip6t_get_ctl+0x1022/0x10a0 [ 68.640849] ? compat_do_ip6t_set_ctl+0x3820/0x3820 [ 68.645890] nf_getsockopt+0x481/0x4e0 [ 68.649789] ipv6_getsockopt+0x26c/0x4f0 [ 68.653883] ? compat_ipv6_setsockopt+0x4c0/0x4c0 [ 68.658753] tcp_getsockopt+0x1c6/0x1f0 [ 68.662739] ? tcp_get_timestamping_opt_stats+0x17f0/0x17f0 [ 68.668453] sock_common_getsockopt+0x13f/0x180 [ 68.673124] ? sock_recv_errqueue+0x950/0x950 [ 68.677620] __sys_getsockopt+0x48c/0x550 [ 68.681793] __se_sys_getsockopt+0xe1/0x100 [ 68.686132] __x64_sys_getsockopt+0x62/0x80 [ 68.690466] do_syscall_64+0xb8/0x100 [ 68.694264] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 68.699448] RIP: 0033:0x44835a [ 68.702632] Code: b8 10 01 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 9d a4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 49 89 ca b8 37 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 7a a4 fb ff c3 66 0f 1f 84 00 00 00 00 00 [ 68.721525] RSP: 002b:00007ffcd0334c18 EFLAGS: 00000212 ORIG_RAX: 0000000000000037 [ 68.729237] RAX: ffffffffffffffda RBX: 00000000006d2fe0 RCX: 000000000044835a [ 68.736501] RDX: 0000000000000041 RSI: 0000000000000029 RDI: 0000000000000003 [ 68.743773] RBP: 00000000006d2fe0 R08: 00007ffcd0334c3c R09: 0000000000004000 [ 68.751067] R10: 00007ffcd0334d40 R11: 0000000000000212 R12: 0000000000000003 [ 68.758327] R13: 00007ffcd0334d40 R14: 00007ffcd0334c40 R15: 0000000000000029 [ 68.765598] Modules linked in: [ 68.768795] ---[ end trace 46053e7afd2f3c3b ]--- [ 68.773577] RIP: 0010:kmsan_get_shadow_address+0x2d6/0x3d0 [ 68.779191] Code: e9 89 00 00 00 c7 04 25 60 75 9e 8a 01 00 00 00 65 48 8b 04 25 80 fc 02 00 c6 80 f3 08 00 00 01 80 3c 25 78 75 9e 8a 00 74 0c <0f> 0b 0f 1f 84 00 00 00 00 00 eb fe 48 c7 c7 99 23 cb 89 31 c0 4c [ 68.798130] RSP: 0018:ffff8801aee6f780 EFLAGS: 00010086 [ 68.803490] RAX: 000000000000001b RBX: 0000000000000000 RCX: 0000000000000000 [ 68.810755] RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000000 [ 68.818017] RBP: ffff8801aee6f7b0 R08: 0000000000000000 R09: ffff88021fd39250 [ 68.825277] R10: 0000000000000000 R11: ffffffff8560abe0 R12: 0000000000000001 [ 68.832537] R13: ffff88019f724c08 R14: 0000000000000001 R15: 0000000000000008 [ 68.839804] FS: 0000000000a8c880(0000) GS:ffff88021fd00000(0000) knlGS:0000000000000000 [ 68.848059] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 68.853958] CR2: 00000000006d0138 CR3: 00000001b0102000 CR4: 00000000001406e0 [ 68.861232] Kernel panic - not syncing: Fatal exception [ 68.866943] Kernel Offset: disabled [ 68.870581] Rebooting in 86400 seconds..