[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 54.410715][ T26] audit: type=1800 audit(1571821681.020:25): pid=8560 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 54.464719][ T26] audit: type=1800 audit(1571821681.020:26): pid=8560 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 54.499339][ T26] audit: type=1800 audit(1571821681.030:27): pid=8560 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 res=0 [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.172' (ECDSA) to the list of known hosts. 2019/10/23 09:23:46 parsed 1 programs 2019/10/23 09:23:48 executed programs: 0 syzkaller login: [ 1001.839287][ T8731] IPVS: ftp: loaded support on port[0] = 21 [ 1001.899478][ T8731] chnl_net:caif_netlink_parms(): no params data found [ 1001.925640][ T8731] bridge0: port 1(bridge_slave_0) entered blocking state [ 1001.934726][ T8731] bridge0: port 1(bridge_slave_0) entered disabled state [ 1001.942609][ T8731] device bridge_slave_0 entered promiscuous mode [ 1001.950997][ T8731] bridge0: port 2(bridge_slave_1) entered blocking state [ 1001.958391][ T8731] bridge0: port 2(bridge_slave_1) entered disabled state [ 1001.965942][ T8731] device bridge_slave_1 entered promiscuous mode [ 1001.982584][ T8731] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 1001.993131][ T8731] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 1002.012151][ T8731] team0: Port device team_slave_0 added [ 1002.019070][ T8731] team0: Port device team_slave_1 added [ 1002.099181][ T8731] device hsr_slave_0 entered promiscuous mode [ 1002.157605][ T8731] device hsr_slave_1 entered promiscuous mode [ 1002.214880][ T8731] bridge0: port 2(bridge_slave_1) entered blocking state [ 1002.222061][ T8731] bridge0: port 2(bridge_slave_1) entered forwarding state [ 1002.229759][ T8731] bridge0: port 1(bridge_slave_0) entered blocking state [ 1002.236807][ T8731] bridge0: port 1(bridge_slave_0) entered forwarding state [ 1002.267016][ T8731] 8021q: adding VLAN 0 to HW filter on device bond0 [ 1002.280751][ T8734] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 1002.290595][ T8734] bridge0: port 1(bridge_slave_0) entered disabled state [ 1002.298715][ T8734] bridge0: port 2(bridge_slave_1) entered disabled state [ 1002.306465][ T8734] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 1002.317728][ T8731] 8021q: adding VLAN 0 to HW filter on device team0 [ 1002.328287][ T8733] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 1002.336618][ T8733] bridge0: port 1(bridge_slave_0) entered blocking state [ 1002.343820][ T8733] bridge0: port 1(bridge_slave_0) entered forwarding state [ 1002.358790][ T8734] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 1002.367188][ T8734] bridge0: port 2(bridge_slave_1) entered blocking state [ 1002.374278][ T8734] bridge0: port 2(bridge_slave_1) entered forwarding state [ 1002.384113][ T8733] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 1002.394336][ T8733] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 1002.410165][ T8731] hsr0: Slave A (hsr_slave_0) is not up; please bring it up to get a fully working HSR network [ 1002.420838][ T8731] hsr0: Slave B (hsr_slave_1) is not up; please bring it up to get a fully working HSR network [ 1002.433056][ T8734] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 1002.441717][ T8734] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 1002.450299][ T8734] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 1002.458822][ T8734] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 1002.476029][ T8731] 8021q: adding VLAN 0 to HW filter on device batadv0 2019/10/23 09:23:53 executed programs: 120 [ 1007.610690][ T9292] ================================================================== [ 1007.618904][ T9292] BUG: KASAN: use-after-free in fuse_request_end+0x825/0x990 [ 1007.626267][ T9292] Read of size 8 at addr ffff8880a19e3068 by task syz-executor.0/9292 [ 1007.634390][ T9292] [ 1007.636705][ T9292] CPU: 0 PID: 9292 Comm: syz-executor.0 Not tainted 5.4.0-rc4+ #0 [ 1007.644479][ T9292] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 1007.654549][ T9292] Call Trace: [ 1007.657913][ T9292] dump_stack+0x172/0x1f0 [ 1007.662235][ T9292] ? fuse_request_end+0x825/0x990 [ 1007.667240][ T9292] print_address_description.constprop.0.cold+0xd4/0x30b [ 1007.674240][ T9292] ? fuse_request_end+0x825/0x990 [ 1007.679295][ T9292] ? fuse_request_end+0x825/0x990 [ 1007.684301][ T9292] __kasan_report.cold+0x1b/0x41 [ 1007.689219][ T9292] ? fuse_request_end+0x825/0x990 [ 1007.694231][ T9292] kasan_report+0x12/0x20 [ 1007.698547][ T9292] __asan_report_load8_noabort+0x14/0x20 [ 1007.704157][ T9292] fuse_request_end+0x825/0x990 [ 1007.709002][ T9292] ? __kasan_check_read+0x11/0x20 [ 1007.714006][ T9292] ? do_raw_spin_unlock+0x57/0x270 [ 1007.719100][ T9292] fuse_dev_do_read.isra.0+0x115b/0x1df0 [ 1007.724880][ T9292] ? __lock_acquire+0x8a0/0x4a00 [ 1007.729828][ T9292] ? fuse_copy_args+0x380/0x380 [ 1007.734654][ T9292] ? find_held_lock+0x35/0x130 [ 1007.739397][ T9292] ? aa_file_perm+0x40b/0xeb0 [ 1007.744057][ T9292] ? lock_downgrade+0x920/0x920 [ 1007.748892][ T9292] ? memset+0x32/0x40 [ 1007.752856][ T9292] fuse_dev_read+0x165/0x200 [ 1007.757424][ T9292] ? fuse_dev_do_read.isra.0+0x1df0/0x1df0 [ 1007.763206][ T9292] ? aa_file_perm+0x432/0xeb0 [ 1007.767868][ T9292] ? mntput_no_expire+0x162/0xbe0 [ 1007.772886][ T9292] ? aa_path_link+0x460/0x460 [ 1007.777542][ T9292] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 1007.783767][ T9292] ? iov_iter_init+0xee/0x220 [ 1007.788445][ T9292] new_sync_read+0x4d7/0x800 [ 1007.793026][ T9292] ? vfs_dedupe_file_range+0x780/0x780 [ 1007.798465][ T9292] ? __fget+0x384/0x560 [ 1007.802603][ T9292] ? security_file_permission+0x8f/0x380 [ 1007.808228][ T9292] __vfs_read+0xe1/0x110 [ 1007.812460][ T9292] vfs_read+0x1f0/0x440 [ 1007.816598][ T9292] ksys_read+0x14f/0x290 [ 1007.820820][ T9292] ? kernel_write+0x130/0x130 [ 1007.825476][ T9292] ? do_syscall_64+0x26/0x760 [ 1007.830191][ T9292] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 1007.836246][ T9292] ? do_syscall_64+0x26/0x760 [ 1007.840903][ T9292] __x64_sys_read+0x73/0xb0 [ 1007.845386][ T9292] do_syscall_64+0xfa/0x760 [ 1007.849872][ T9292] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 1007.855742][ T9292] RIP: 0033:0x459ef9 [ 1007.859626][ T9292] Code: ad b6 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 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 [ 1007.879210][ T9292] RSP: 002b:00007f8a636fbc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 [ 1007.887613][ T9292] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000459ef9 [ 1007.895568][ T9292] RDX: 00000000fffffed0 RSI: 00000000200030c0 RDI: 0000000000000003 [ 1007.903517][ T9292] RBP: 000000000075bfc8 R08: 0000000000000000 R09: 0000000000000000 [ 1007.911464][ T9292] R10: 0000000000000000 R11: 0000000000000246 R12: 00007f8a636fc6d4 [ 1007.919412][ T9292] R13: 00000000004c76e7 R14: 00000000004dd1d0 R15: 00000000ffffffff [ 1007.927382][ T9292] [ 1007.929699][ T9292] Allocated by task 9292: [ 1007.934010][ T9292] save_stack+0x23/0x90 [ 1007.938152][ T9292] __kasan_kmalloc.constprop.0+0xcf/0xe0 [ 1007.943765][ T9292] kasan_kmalloc+0x9/0x10 [ 1007.948077][ T9292] kmem_cache_alloc_trace+0x158/0x790 [ 1007.953435][ T9292] fuse_send_init+0x48/0x440 [ 1007.958000][ T9292] fuse_fill_super+0x2a6/0x3a0 [ 1007.962740][ T9292] vfs_get_super+0x13e/0x2e0 [ 1007.967311][ T9292] get_tree_nodev+0x23/0x30 [ 1007.971801][ T9292] fuse_get_tree+0x12e/0x190 [ 1007.976367][ T9292] vfs_get_tree+0x8e/0x300 [ 1007.980760][ T9292] do_mount+0x143d/0x1d10 [ 1007.985077][ T9292] ksys_mount+0xdb/0x150 [ 1007.989294][ T9292] __x64_sys_mount+0xbe/0x150 [ 1007.993946][ T9292] do_syscall_64+0xfa/0x760 [ 1007.998424][ T9292] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 1008.004288][ T9292] [ 1008.006598][ T9292] Freed by task 9290: [ 1008.010556][ T9292] save_stack+0x23/0x90 [ 1008.014685][ T9292] __kasan_slab_free+0x102/0x150 [ 1008.019599][ T9292] kasan_slab_free+0xe/0x10 [ 1008.024075][ T9292] kfree+0x10a/0x2c0 [ 1008.027957][ T9292] process_init_reply+0xfb/0x1620 [ 1008.032969][ T9292] fuse_request_end+0x388/0x990 [ 1008.037796][ T9292] end_requests+0x16c/0x240 [ 1008.042276][ T9292] fuse_abort_conn+0xa4d/0xdb0 [ 1008.047013][ T9292] fuse_sb_destroy+0xa3/0x120 [ 1008.051668][ T9292] fuse_kill_sb_anon+0x16/0x30 [ 1008.056406][ T9292] deactivate_locked_super+0x95/0x100 [ 1008.061753][ T9292] deactivate_super+0x1b2/0x1d0 [ 1008.066580][ T9292] cleanup_mnt+0x351/0x4c0 [ 1008.070978][ T9292] __cleanup_mnt+0x16/0x20 [ 1008.075371][ T9292] task_work_run+0x145/0x1c0 [ 1008.079938][ T9292] exit_to_usermode_loop+0x316/0x380 [ 1008.085198][ T9292] do_syscall_64+0x65f/0x760 [ 1008.089767][ T9292] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 1008.095628][ T9292] [ 1008.097936][ T9292] The buggy address belongs to the object at ffff8880a19e3000 [ 1008.097936][ T9292] which belongs to the cache kmalloc-192 of size 192 [ 1008.111963][ T9292] The buggy address is located 104 bytes inside of [ 1008.111963][ T9292] 192-byte region [ffff8880a19e3000, ffff8880a19e30c0) [ 1008.125201][ T9292] The buggy address belongs to the page: [ 1008.130810][ T9292] page:ffffea00028678c0 refcount:1 mapcount:0 mapping:ffff8880aa400000 index:0x0 [ 1008.139889][ T9292] flags: 0x1fffc0000000200(slab) [ 1008.144811][ T9292] raw: 01fffc0000000200 ffffea000286b008 ffffea00028538c8 ffff8880aa400000 [ 1008.153368][ T9292] raw: 0000000000000000 ffff8880a19e3000 0000000100000010 0000000000000000 [ 1008.161920][ T9292] page dumped because: kasan: bad access detected [ 1008.168303][ T9292] [ 1008.170604][ T9292] Memory state around the buggy address: [ 1008.176212][ T9292] ffff8880a19e2f00: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc [ 1008.184246][ T9292] ffff8880a19e2f80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc [ 1008.192286][ T9292] >ffff8880a19e3000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 1008.200327][ T9292] ^ [ 1008.207765][ T9292] ffff8880a19e3080: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc [ 1008.215811][ T9292] ffff8880a19e3100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 1008.223844][ T9292] ================================================================== [ 1008.231876][ T9292] Disabling lock debugging due to kernel taint [ 1008.239177][ T9292] Kernel panic - not syncing: panic_on_warn set ... [ 1008.245763][ T9292] CPU: 0 PID: 9292 Comm: syz-executor.0 Tainted: G B 5.4.0-rc4+ #0 [ 1008.254941][ T9292] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 1008.264970][ T9292] Call Trace: [ 1008.268236][ T9292] dump_stack+0x172/0x1f0 [ 1008.272543][ T9292] panic+0x2e3/0x75c [ 1008.276419][ T9292] ? add_taint.cold+0x16/0x16 [ 1008.281078][ T9292] ? fuse_request_end+0x825/0x990 [ 1008.286079][ T9292] ? preempt_schedule+0x4b/0x60 [ 1008.290918][ T9292] ? ___preempt_schedule+0x16/0x20 [ 1008.296098][ T9292] ? trace_hardirqs_on+0x5e/0x240 [ 1008.301100][ T9292] ? fuse_request_end+0x825/0x990 [ 1008.306097][ T9292] end_report+0x47/0x4f [ 1008.310250][ T9292] ? fuse_request_end+0x825/0x990 [ 1008.315253][ T9292] __kasan_report.cold+0xe/0x41 [ 1008.320085][ T9292] ? fuse_request_end+0x825/0x990 [ 1008.325097][ T9292] kasan_report+0x12/0x20 [ 1008.329412][ T9292] __asan_report_load8_noabort+0x14/0x20 [ 1008.335058][ T9292] fuse_request_end+0x825/0x990 [ 1008.339909][ T9292] ? __kasan_check_read+0x11/0x20 [ 1008.344931][ T9292] ? do_raw_spin_unlock+0x57/0x270 [ 1008.350022][ T9292] fuse_dev_do_read.isra.0+0x115b/0x1df0 [ 1008.355633][ T9292] ? __lock_acquire+0x8a0/0x4a00 [ 1008.360574][ T9292] ? fuse_copy_args+0x380/0x380 [ 1008.365401][ T9292] ? find_held_lock+0x35/0x130 [ 1008.370140][ T9292] ? aa_file_perm+0x40b/0xeb0 [ 1008.374796][ T9292] ? lock_downgrade+0x920/0x920 [ 1008.379668][ T9292] ? memset+0x32/0x40 [ 1008.383636][ T9292] fuse_dev_read+0x165/0x200 [ 1008.388209][ T9292] ? fuse_dev_do_read.isra.0+0x1df0/0x1df0 [ 1008.394016][ T9292] ? aa_file_perm+0x432/0xeb0 [ 1008.398677][ T9292] ? mntput_no_expire+0x162/0xbe0 [ 1008.403680][ T9292] ? aa_path_link+0x460/0x460 [ 1008.408336][ T9292] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 1008.414551][ T9292] ? iov_iter_init+0xee/0x220 [ 1008.419201][ T9292] new_sync_read+0x4d7/0x800 [ 1008.423768][ T9292] ? vfs_dedupe_file_range+0x780/0x780 [ 1008.429204][ T9292] ? __fget+0x384/0x560 [ 1008.433338][ T9292] ? security_file_permission+0x8f/0x380 [ 1008.438950][ T9292] __vfs_read+0xe1/0x110 [ 1008.443168][ T9292] vfs_read+0x1f0/0x440 [ 1008.447309][ T9292] ksys_read+0x14f/0x290 [ 1008.451570][ T9292] ? kernel_write+0x130/0x130 [ 1008.456239][ T9292] ? do_syscall_64+0x26/0x760 [ 1008.460905][ T9292] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 1008.466971][ T9292] ? do_syscall_64+0x26/0x760 [ 1008.471651][ T9292] __x64_sys_read+0x73/0xb0 [ 1008.476132][ T9292] do_syscall_64+0xfa/0x760 [ 1008.480614][ T9292] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 1008.486480][ T9292] RIP: 0033:0x459ef9 [ 1008.490353][ T9292] Code: ad b6 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 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 [ 1008.509940][ T9292] RSP: 002b:00007f8a636fbc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 [ 1008.518326][ T9292] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000459ef9 [ 1008.526272][ T9292] RDX: 00000000fffffed0 RSI: 00000000200030c0 RDI: 0000000000000003 [ 1008.534220][ T9292] RBP: 000000000075bfc8 R08: 0000000000000000 R09: 0000000000000000 [ 1008.542166][ T9292] R10: 0000000000000000 R11: 0000000000000246 R12: 00007f8a636fc6d4 [ 1008.550113][ T9292] R13: 00000000004c76e7 R14: 00000000004dd1d0 R15: 00000000ffffffff [ 1008.559180][ T9292] Kernel Offset: disabled [ 1008.563502][ T9292] Rebooting in 86400 seconds..