Debian GNU/Linux 9 syzkaller ttyS0 syzkaller login: [ 29.301744] can: request_module (can-proto-0) failed. [ 29.305180] can: request_module (can-proto-0) failed. [ 29.945257] IPVS: ftp: loaded support on port[0] = 21 [ 30.074042] ip (3423) used greatest stack depth: 11480 bytes left [ 30.209844] 8021q: adding VLAN 0 to HW filter on device bond0 [ 30.234658] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 30.962380] bond0 (unregistering): Released all slaves Warning: Permanently added '10.128.10.51' (ECDSA) to the list of known hosts. 2020/12/07 12:18:13 parsed 1 programs 2020/12/07 12:18:13 executed programs: 0 [ 36.740460] IPVS: ftp: loaded support on port[0] = 21 [ 36.746021] IPVS: ftp: loaded support on port[0] = 21 [ 36.750812] IPVS: ftp: loaded support on port[0] = 21 [ 36.756585] IPVS: ftp: loaded support on port[0] = 21 [ 36.762512] IPVS: ftp: loaded support on port[0] = 21 [ 36.781473] IPVS: ftp: loaded support on port[0] = 21 [ 36.796954] hfs: unable to locate alternate MDB [ 36.801768] hfs: continuing without an alternate MDB [ 36.809684] BUG: kernel NULL pointer dereference, address: 0000000000000040 [ 36.816876] #PF: supervisor read access in kernel mode [ 36.822135] #PF: error_code(0x0000) - not-present page [ 36.827387] PGD 10b2ef067 P4D 10b2ef067 PUD 10b2f0067 PMD 0 [ 36.833156] Oops: 0000 [#1] SMP [ 36.836408] CPU: 0 PID: 3680 Comm: syz-executor3 Not tainted 5.10.0-rc7-syzkaller #0 [ 36.844274] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 36.853607] RIP: 0010:hfs_find_init+0x19/0x60 [ 36.858194] Code: fe ff ff ff eb 8d cc cc cc cc cc cc cc cc cc cc cc 55 48 89 e5 41 54 49 89 f4 53 48 89 fb 48 89 7e 10 48 c7 46 18 00 00 00 00 <8b> 47 40 be c0 0c 00 00 8d 7c 00 04 e8 56 74 e0 ff 48 85 c0 74 23 [ 36.877246] RSP: 0018:ffffc9000043b9a0 EFLAGS: 00010246 [ 36.882582] RAX: ffff88810f7f3000 RBX: 0000000000000000 RCX: 0000000000000000 [ 36.889844] RDX: 0000000000000000 RSI: ffffc9000043b9c0 RDI: 0000000000000000 [ 36.897085] RBP: ffffc9000043b9b0 R08: ffffffff84fe0ed8 R09: 96342fd6fa1a0571 [ 36.904412] R10: ffffc9000043ba18 R11: 0000000000000282 R12: ffffc9000043b9c0 [ 36.911740] R13: 0000000000000000 R14: 0000000000000000 R15: ffff88810ec17348 [ 36.918989] FS: 00007fe5907ff700(0000) GS:ffff888237c00000(0000) knlGS:0000000000000000 [ 36.927271] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 36.933122] CR2: 0000000000000040 CR3: 000000010b2f2000 CR4: 0000000000350ef0 [ 36.940453] Call Trace: [ 36.943022] hfs_ext_read_extent+0x53/0x1a0 [ 36.947330] hfs_get_block+0x162/0x220 [ 36.951206] block_read_full_page+0x10b/0x3c0 [ 36.955678] ? hfs_extend_file+0x280/0x280 [ 36.959887] ? lru_cache_add+0x12d/0x210 [ 36.963922] hfs_readpage+0x13/0x20 [ 36.967538] do_read_cache_page+0x5e1/0x790 [ 36.971849] ? find_held_lock+0x35/0xa0 [ 36.975796] ? unlock_new_inode+0x62/0x70 [ 36.979914] ? do_raw_spin_unlock+0x52/0xd0 [ 36.984210] ? hfs_ext_read_extent+0x1a0/0x1a0 [ 36.988763] read_cache_page+0xd/0x10 [ 36.992537] hfs_btree_open+0x136/0x340 [ 36.996508] hfs_mdb_get+0x4ee/0x610 [ 37.000194] hfs_fill_super+0x361/0x630 [ 37.004380] ? vsnprintf+0x377/0x520 [ 37.008067] ? snprintf+0x49/0x60 [ 37.011840] mount_bdev+0x197/0x1d0 [ 37.015442] ? hfs_show_options+0x200/0x200 [ 37.019734] hfs_mount+0x10/0x20 [ 37.023246] legacy_get_tree+0x2f/0x50 [ 37.027104] vfs_get_tree+0x28/0xc0 [ 37.030704] ? capable+0x14/0x20 [ 37.034040] path_mount+0x765/0xaf0 [ 37.037639] do_mount+0x77/0x90 [ 37.040890] __x64_sys_mount+0xc0/0xe0 [ 37.044749] do_syscall_64+0x37/0x80 [ 37.048433] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 37.053595] RIP: 0033:0x457a7a [ 37.056869] Code: b8 a6 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 5d 8f fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 3a 8f fb ff c3 66 0f 1f 84 00 00 00 00 00 [ 37.075847] RSP: 002b:00007fe5907febb8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 [ 37.083541] RAX: ffffffffffffffda RBX: 0000000020000000 RCX: 0000000000457a7a [ 37.090801] RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007fe5907fec00 [ 37.098043] RBP: 0000000000000003 R08: 00000000200001c0 R09: 0000000020000000 [ 37.105288] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000003 [ 37.112532] R13: 0000000000000666 R14: 00000000006fba30 R15: 0000000000000000 [ 37.119776] Modules linked in: [ 37.122940] CR2: 0000000000000040 [ 37.126365] ---[ end trace 1c325d92128377f4 ]--- [ 37.131092] RIP: 0010:hfs_find_init+0x19/0x60 [ 37.135557] Code: fe ff ff ff eb 8d cc cc cc cc cc cc cc cc cc cc cc 55 48 89 e5 41 54 49 89 f4 53 48 89 fb 48 89 7e 10 48 c7 46 18 00 00 00 00 <8b> 47 40 be c0 0c 00 00 8d 7c 00 04 e8 56 74 e0 ff 48 85 c0 74 23 [ 37.154437] RSP: 0018:ffffc9000043b9a0 EFLAGS: 00010246 [ 37.159772] RAX: ffff88810f7f3000 RBX: 0000000000000000 RCX: 0000000000000000 [ 37.167032] RDX: 0000000000000000 RSI: ffffc9000043b9c0 RDI: 0000000000000000 [ 37.174275] RBP: ffffc9000043b9b0 R08: ffffffff84fe0ed8 R09: 96342fd6fa1a0571 [ 37.181604] R10: ffffc9000043ba18 R11: 0000000000000282 R12: ffffc9000043b9c0 [ 37.188852] R13: 0000000000000000 R14: 0000000000000000 R15: ffff88810ec17348 [ 37.196097] FS: 00007fe5907ff700(0000) GS:ffff888237c00000(0000) knlGS:0000000000000000 [ 37.204397] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 37.210251] CR2: 0000000000000040 CR3: 000000010b2f2000 CR4: 0000000000350ef0 [ 37.217501] Kernel panic - not syncing: Fatal exception [ 37.226229] Kernel Offset: disabled [ 37.229999] Rebooting in 86400 seconds..