[....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 41.290202] can: request_module (can-proto-0) failed. [ 41.298803] can: request_module (can-proto-0) failed. [ 42.102870] IPVS: ftp: loaded support on port[0] = 21 [ 42.683578] 8021q: adding VLAN 0 to HW filter on device bond0 [ 42.744164] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 43.041853] tipc: TX() has been purged, node left! [ 44.566682] bond0 (unregistering): Released all slaves Warning: Permanently added '10.128.1.40' (ECDSA) to the list of known hosts. 2020/01/13 02:05:58 parsed 1 programs 2020/01/13 02:05:58 executed programs: 0 [ 49.686708] IPVS: ftp: loaded support on port[0] = 21 [ 49.712286] IPVS: ftp: loaded support on port[0] = 21 [ 49.725345] IPVS: ftp: loaded support on port[0] = 21 [ 49.725866] IPVS: ftp: loaded support on port[0] = 21 [ 49.750069] IPVS: ftp: loaded support on port[0] = 21 [ 49.760871] hfs: unable to locate alternate MDB [ 49.765666] hfs: continuing without an alternate MDB [ 49.768535] IPVS: ftp: loaded support on port[0] = 21 [ 49.775033] hfs: new node 0 already hashed? [ 49.780476] ------------[ cut here ]------------ [ 49.785234] WARNING: CPU: 0 PID: 4443 at fs/hfs/bnode.c:416 hfs_bnode_create.cold.12+0xe/0x15 [ 49.793888] Kernel panic - not syncing: panic_on_warn set ... [ 49.799766] CPU: 0 PID: 4443 Comm: syz-executor Not tainted 5.5.0-rc6-syzkaller #0 [ 49.807465] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 49.816850] Call Trace: [ 49.819432] dump_stack+0x12f/0x187 [ 49.823068] ? hfs_bnode_create.cold.12+0xe/0x15 [ 49.827821] panic+0x22a/0x4f5 [ 49.831292] ? add_taint.cold.7+0x11/0x11 [ 49.835449] __warn.cold.10+0x25/0x28 [ 49.839245] ? hfs_bnode_create.cold.12+0xe/0x15 [ 49.843995] report_bug+0x1b0/0x270 [ 49.847620] do_error_trap+0x11b/0x200 [ 49.851514] do_invalid_op+0x36/0x40 [ 49.855225] ? hfs_bnode_create.cold.12+0xe/0x15 [ 49.859976] invalid_op+0x23/0x30 [ 49.863431] RIP: 0010:hfs_bnode_create.cold.12+0xe/0x15 [ 49.868783] Code: db e8 7a 21 5a ff e9 5e e0 ff ff 48 c7 c7 e0 91 3a 87 e8 69 21 5a ff e9 8f f6 ff ff 89 de 48 c7 c7 20 92 3a 87 e8 56 21 5a ff <0f> 0b e9 c8 fe ff ff 48 b8 00 00 00 00 00 fc ff df 55 48 89 e5 41 [ 49.887682] RSP: 0018:ffff8881c53bf880 EFLAGS: 00010282 [ 49.893045] RAX: 000000000000001f RBX: 0000000000000000 RCX: ffffffff82d8576e [ 49.900347] RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff8881db029dec [ 49.907673] RBP: ffff8881c53bf8c8 R08: ffffed103b606631 R09: ffffed103b606631 [ 49.914933] R10: ffffed103b606630 R11: ffff8881db033187 R12: ffff8881c74820d0 [ 49.922182] R13: dffffc0000000000 R14: ffff8881d7769400 R15: ffff8881d7769400 [ 49.929449] ? llist_add_batch+0x5e/0xa0 [ 49.933492] hfs_bmap_alloc+0x423/0x5d0 [ 49.937450] ? hfs_bmap_reserve+0x3b0/0x3b0 [ 49.941757] ? memcpy+0x45/0x50 [ 49.945023] ? hfs_bnode_read+0xb9/0xe0 [ 49.948986] hfs_bnode_split+0xbd/0xe20 [ 49.953047] ? memcpy+0x45/0x50 [ 49.956305] ? hfs_bnode_read+0xb9/0xe0 [ 49.960259] ? hfs_bnode_create.cold.12+0x15/0x15 [ 49.965077] ? hfs_bnode_read_u16+0x62/0x90 [ 49.969393] ? hfs_bnode_read+0xe0/0xe0 [ 49.973359] ? hfs_find_exit+0xc0/0xc0 [ 49.977229] hfs_brec_insert+0x2f0/0xbb0 [ 49.981275] ? hfs_brec_keylen+0x330/0x330 [ 49.985533] hfs_cat_create+0x697/0x880 [ 49.989490] ? hfs_cat_build_key+0x180/0x180 [ 49.993893] ? hfs_new_inode+0x4b0/0xd20 [ 49.997944] hfs_mkdir+0x57/0xc0 [ 50.001301] vfs_mkdir+0x384/0x600 [ 50.004873] do_mkdirat+0x1b7/0x210 [ 50.008518] ? __ia32_sys_mknod+0xb0/0xb0 [ 50.012650] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 50.017993] ? lockdep_hardirqs_on+0x42d/0x5d0 [ 50.022585] __x64_sys_mkdir+0x57/0x80 [ 50.026464] do_syscall_64+0xd0/0x600 [ 50.030244] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 50.035424] RIP: 0033:0x455429 [ 50.038685] Code: 1d ba fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 eb b9 fb ff c3 66 2e 0f 1f 84 00 00 00 00 [ 50.057578] RSP: 002b:00007f41b64d7c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000053 [ 50.065265] RAX: ffffffffffffffda RBX: 00007f41b64d86d4 RCX: 0000000000455429 [ 50.072551] RDX: 0000000000000000 RSI: 0000000000000021 RDI: 0000000020000180 [ 50.080296] RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000 [ 50.087548] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff [ 50.094805] R13: 00000000000003ea R14: 00000000006f8e90 R15: 0000000000000000 [ 50.102929] Kernel Offset: disabled [ 50.106594] Rebooting in 86400 seconds..