syzkaller login: [ 31.785644] can: request_module (can-proto-0) failed. [ 31.790844] can: request_module (can-proto-0) failed. [ 32.612238] IPVS: ftp: loaded support on port[0] = 21 [ 32.771597] ip (3337) used greatest stack depth: 23696 bytes left [ 32.921090] ip (3416) used greatest stack depth: 23584 bytes left [ 33.320446] 8021q: adding VLAN 0 to HW filter on device bond0 [ 33.389058] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 33.687032] tipc: TX() has been purged, node left! [ 35.142690] bond0 (unregistering): Released all slaves Warning: Permanently added '10.128.15.197' (ECDSA) to the list of known hosts. 2020/06/15 15:37:23 parsed 1 programs 2020/06/15 15:37:23 executed programs: 0 [ 41.123833] IPVS: ftp: loaded support on port[0] = 21 [ 41.127153] IPVS: ftp: loaded support on port[0] = 21 [ 41.138324] IPVS: ftp: loaded support on port[0] = 21 [ 41.147117] IPVS: ftp: loaded support on port[0] = 21 [ 41.159119] IPVS: ftp: loaded support on port[0] = 21 [ 41.163232] IPVS: ftp: loaded support on port[0] = 21 [ 41.326023] hfs: unable to locate alternate MDB [ 41.330849] hfs: continuing without an alternate MDB [ 41.351337] hfs: unable to open extent tree [ 41.355854] hfs: can't find a HFS filesystem on dev loop3 [ 41.365483] hfs: unable to locate alternate MDB [ 41.370313] hfs: continuing without an alternate MDB [ 41.377586] general protection fault, probably for non-canonical address 0xdffffc0000000008: 0000 [#1] SMP KASAN [ 41.388093] KASAN: null-ptr-deref in range [0x0000000000000040-0x0000000000000047] [ 41.395809] CPU: 0 PID: 3722 Comm: syz-executor5 Not tainted 5.8.0-rc1-syzkaller #0 [ 41.403577] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 41.412935] RIP: 0010:hfs_find_init+0x73/0x180 [ 41.417515] Code: ea 03 80 3c 02 00 0f 85 ee 00 00 00 4d 8d 6c 24 40 48 c7 43 18 00 00 00 00 48 b8 00 00 00 00 00 fc ff df 4c 89 ea 48 c1 ea 03 <0f> b6 04 02 84 c0 74 08 3c 03 0f 8e ac 00 00 00 41 8b 44 24 40 be [ 41.436411] RSP: 0018:ffff8881c93e7348 EFLAGS: 00010202 [ 41.441790] RAX: dffffc0000000000 RBX: ffff8881c93e73c8 RCX: 1ffff1103929d105 [ 41.449042] RDX: 0000000000000008 RSI: ffff8881c93e73c8 RDI: ffff8881c93e73e0 [ 41.456810] RBP: ffff8881c93e7368 R08: 0000000000000000 R09: ffff8881c93e7428 [ 41.464473] R10: 0000000000000000 R11: ffffed10391bee5a R12: 0000000000000000 [ 41.472453] R13: 0000000000000040 R14: ffff8881c8df738a R15: ffff8881c93e73c8 [ 41.479706] FS: 00007fb0796e8700(0000) GS:ffff8881db000000(0000) knlGS:0000000000000000 [ 41.487906] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 41.493786] CR2: 00007efe2c2b49ab CR3: 00000001c91f9000 CR4: 00000000001406f0 [ 41.501217] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 41.508467] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 41.516669] Call Trace: [ 41.519253] hfs_ext_read_extent+0x17e/0xcc0 [ 41.524772] ? __kasan_check_write+0x14/0x20 [ 41.529159] ? do_raw_spin_lock+0x129/0x2e0 [ 41.533652] ? hfs_ext_write_extent.part.5+0x160/0x160 [ 41.538906] ? alloc_buffer_head+0x81/0xd0 [ 41.543124] hfs_get_block+0x490/0x850 [ 41.546995] block_read_full_page+0x290/0x9b0 [ 41.551484] ? hfs_extend_file+0xc20/0xc20 [ 41.555703] ? block_truncate_page+0x8c0/0x8c0 [ 41.560274] ? add_to_page_cache_lru+0x16b/0x250 [ 41.565014] ? add_to_page_cache_locked+0x10/0x10 [ 41.569840] ? __page_cache_alloc+0x1fc/0x3a0 [ 41.574313] hfs_readpage+0x13/0x20 [ 41.578009] do_read_cache_page+0x65c/0x1370 [ 41.582398] ? find_held_lock+0x36/0x1d0 [ 41.586618] ? generic_file_read_iter+0x4b0/0x4b0 [ 41.591436] ? unlock_new_inode+0x5c/0x100 [ 41.595647] ? lock_downgrade+0x960/0x960 [ 41.599773] ? __kasan_check_write+0x14/0x20 [ 41.604154] ? do_raw_spin_lock+0x129/0x2e0 [ 41.608452] ? rwlock_bug.part.1+0x90/0x90 [ 41.612677] ? wake_bit_function+0x180/0x180 [ 41.617063] ? do_raw_spin_unlock+0x177/0x260 [ 41.621542] read_cache_page+0x45/0x70 [ 41.625415] hfs_btree_open+0x464/0x1070 [ 41.629472] hfs_mdb_get+0x132f/0x1ec7 [ 41.633434] ? hfs_mdb_put+0x340/0x340 [ 41.637314] ? queue_work_node+0x320/0x320 [ 41.641564] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 41.646386] ? lockdep_init_map_waits+0x270/0x870 [ 41.651203] ? debug_mutex_init+0x36/0x70 [ 41.655415] hfs_fill_super+0x961/0x11a0 [ 41.659466] ? device_node_string.isra.6+0x160/0x160 [ 41.664552] ? hfs_show_options+0x550/0x550 [ 41.668853] ? file_dentry_name+0x100/0x100 [ 41.673158] ? vsnprintf+0x8b0/0x1820 [ 41.676939] ? pointer+0x760/0x760 [ 41.680652] ? down_write+0xe1/0x150 [ 41.684343] ? snprintf+0x91/0xc0 [ 41.687774] ? vsprintf+0x20/0x20 [ 41.691211] ? register_shrinker_prepared+0xe1/0x150 [ 41.696301] ? sget+0x3a1/0x4a0 [ 41.699569] mount_bdev+0x27b/0x340 [ 41.703178] ? hfs_show_options+0x550/0x550 [ 41.707479] ? hfs_statfs+0x550/0x550 [ 41.711260] hfs_mount+0x10/0x20 [ 41.714775] legacy_get_tree+0x103/0x1f0 [ 41.718905] vfs_get_tree+0x8b/0x2d0 [ 41.722617] ? capable+0x14/0x20 [ 41.725982] do_mount+0x1293/0x1c40 [ 41.729639] ? lock_downgrade+0x960/0x960 [ 41.733762] ? copy_mount_string+0x20/0x20 [ 41.737971] ? ___might_sleep+0x13e/0x2b0 [ 41.742095] ? __kasan_check_write+0x14/0x20 [ 41.746484] ? _copy_from_user+0xc5/0x110 [ 41.750637] __x64_sys_mount+0x169/0x1c0 [ 41.754685] do_syscall_64+0x6e/0xf0 [ 41.758377] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 41.763635] RIP: 0033:0x4579fa [ 41.766834] Code: Bad RIP value. [ 41.770173] RSP: 002b:00007fb0796e7bb8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 [ 41.777854] RAX: ffffffffffffffda RBX: 0000000020000000 RCX: 00000000004579fa [ 41.785102] RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007fb0796e7c00 [ 41.792349] RBP: 0000000000000003 R08: 00000000200001c0 R09: 0000000020000000 [ 41.799609] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000003 [ 41.806854] R13: 0000000000000666 R14: 00000000006fba30 R15: 0000000000000000 [ 41.814104] Modules linked in: [ 41.817514] ---[ end trace e55eda00780b257a ]--- [ 41.822310] RIP: 0010:hfs_find_init+0x73/0x180 [ 41.827255] Code: ea 03 80 3c 02 00 0f 85 ee 00 00 00 4d 8d 6c 24 40 48 c7 43 18 00 00 00 00 48 b8 00 00 00 00 00 fc ff df 4c 89 ea 48 c1 ea 03 <0f> b6 04 02 84 c0 74 08 3c 03 0f 8e ac 00 00 00 41 8b 44 24 40 be [ 41.828865] hfs: unable to locate alternate MDB [ 41.846198] RSP: 0018:ffff8881c93e7348 EFLAGS: 00010202 [ 41.846204] RAX: dffffc0000000000 RBX: ffff8881c93e73c8 RCX: 1ffff1103929d105 [ 41.846207] RDX: 0000000000000008 RSI: ffff8881c93e73c8 RDI: ffff8881c93e73e0 [ 41.846209] RBP: ffff8881c93e7368 R08: 0000000000000000 R09: ffff8881c93e7428 [ 41.846212] R10: 0000000000000000 R11: ffffed10391bee5a R12: 0000000000000000 [ 41.846214] R13: 0000000000000040 R14: ffff8881c8df738a R15: ffff8881c93e73c8 [ 41.846219] FS: 00007fb0796e8700(0000) GS:ffff8881db000000(0000) knlGS:0000000000000000 [ 41.846221] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 41.846223] CR2: 00007efe2c2b49ab CR3: 00000001c91f9000 CR4: 00000000001406f0 [ 41.846229] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 41.846231] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 41.846235] Kernel panic - not syncing: Fatal exception [ 41.851867] Kernel Offset: disabled [ 41.939554] Rebooting in 86400 seconds..