[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 58.022825][ T26] audit: type=1800 audit(1571389059.051:25): pid=8549 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 58.063880][ T26] audit: type=1800 audit(1571389059.051:26): pid=8549 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 58.102768][ T26] audit: type=1800 audit(1571389059.051:27): pid=8549 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 '10.128.0.104' (ECDSA) to the list of known hosts. 2019/10/18 08:58:11 parsed 1 programs 2019/10/18 08:58:13 executed programs: 0 syzkaller login: [ 92.336357][ T8718] IPVS: ftp: loaded support on port[0] = 21 [ 92.397685][ T8718] chnl_net:caif_netlink_parms(): no params data found [ 92.423429][ T8718] bridge0: port 1(bridge_slave_0) entered blocking state [ 92.431568][ T8718] bridge0: port 1(bridge_slave_0) entered disabled state [ 92.439364][ T8718] device bridge_slave_0 entered promiscuous mode [ 92.447641][ T8718] bridge0: port 2(bridge_slave_1) entered blocking state [ 92.454918][ T8718] bridge0: port 2(bridge_slave_1) entered disabled state [ 92.462510][ T8718] device bridge_slave_1 entered promiscuous mode [ 92.479577][ T8718] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 92.490375][ T8718] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 92.509990][ T8718] team0: Port device team_slave_0 added [ 92.516990][ T8718] team0: Port device team_slave_1 added [ 92.595682][ T8718] device hsr_slave_0 entered promiscuous mode [ 92.664317][ T8718] device hsr_slave_1 entered promiscuous mode [ 92.740845][ T8718] bridge0: port 2(bridge_slave_1) entered blocking state [ 92.748030][ T8718] bridge0: port 2(bridge_slave_1) entered forwarding state [ 92.755852][ T8718] bridge0: port 1(bridge_slave_0) entered blocking state [ 92.762899][ T8718] bridge0: port 1(bridge_slave_0) entered forwarding state [ 92.797162][ T8718] 8021q: adding VLAN 0 to HW filter on device bond0 [ 92.808753][ T22] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 92.828584][ T22] bridge0: port 1(bridge_slave_0) entered disabled state [ 92.836840][ T22] bridge0: port 2(bridge_slave_1) entered disabled state [ 92.846037][ T22] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 92.857130][ T8718] 8021q: adding VLAN 0 to HW filter on device team0 [ 92.867684][ T2852] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 92.876894][ T2852] bridge0: port 1(bridge_slave_0) entered blocking state [ 92.884024][ T2852] bridge0: port 1(bridge_slave_0) entered forwarding state [ 92.896394][ T22] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 92.905057][ T22] bridge0: port 2(bridge_slave_1) entered blocking state [ 92.912185][ T22] bridge0: port 2(bridge_slave_1) entered forwarding state [ 92.935043][ T2852] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 92.943493][ T2852] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 92.951997][ T2852] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 92.960213][ T2852] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 92.968914][ T2852] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 92.977687][ T8718] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 92.995521][ T8718] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 93.136908][ T8726] ================================================================== [ 93.145120][ T8726] BUG: KASAN: use-after-free in fuse_request_end+0x825/0x990 [ 93.152467][ T8726] Read of size 8 at addr ffff8880a15b8468 by task syz-executor.0/8726 [ 93.160585][ T8726] [ 93.162897][ T8726] CPU: 0 PID: 8726 Comm: syz-executor.0 Not tainted 5.4.0-rc3+ #0 [ 93.170671][ T8726] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 93.180709][ T8726] Call Trace: [ 93.183982][ T8726] dump_stack+0x172/0x1f0 [ 93.188290][ T8726] ? fuse_request_end+0x825/0x990 [ 93.193293][ T8726] print_address_description.constprop.0.cold+0xd4/0x30b [ 93.200292][ T8726] ? fuse_request_end+0x825/0x990 [ 93.205297][ T8726] ? fuse_request_end+0x825/0x990 [ 93.210296][ T8726] __kasan_report.cold+0x1b/0x41 [ 93.215215][ T8726] ? fuse_request_end+0x825/0x990 [ 93.220217][ T8726] kasan_report+0x12/0x20 [ 93.224594][ T8726] __asan_report_load8_noabort+0x14/0x20 [ 93.230394][ T8726] fuse_request_end+0x825/0x990 [ 93.235248][ T8726] ? __kasan_check_read+0x11/0x20 [ 93.240297][ T8726] ? do_raw_spin_unlock+0x57/0x270 [ 93.245397][ T8726] fuse_dev_do_read.isra.0+0x115b/0x1df0 [ 93.251008][ T8726] ? __lock_acquire+0x8a0/0x4a00 [ 93.255977][ T8726] ? fuse_copy_args+0x380/0x380 [ 93.260805][ T8726] ? find_held_lock+0x35/0x130 [ 93.265565][ T8726] ? aa_file_perm+0x40b/0xeb0 [ 93.270230][ T8726] ? lock_downgrade+0x920/0x920 [ 93.275074][ T8726] ? memset+0x32/0x40 [ 93.279059][ T8726] fuse_dev_read+0x165/0x200 [ 93.283632][ T8726] ? fuse_dev_do_read.isra.0+0x1df0/0x1df0 [ 93.289420][ T8726] ? aa_file_perm+0x432/0xeb0 [ 93.294081][ T8726] ? aa_path_link+0x460/0x460 [ 93.298745][ T8726] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 93.304978][ T8726] ? iov_iter_init+0xee/0x220 [ 93.309634][ T8726] new_sync_read+0x4d7/0x800 [ 93.314208][ T8726] ? vfs_dedupe_file_range+0x780/0x780 [ 93.319649][ T8726] ? __fget+0x384/0x560 [ 93.323787][ T8726] ? security_file_permission+0x8f/0x380 [ 93.329397][ T8726] __vfs_read+0xe1/0x110 [ 93.333617][ T8726] vfs_read+0x1f0/0x440 [ 93.337767][ T8726] ksys_read+0x14f/0x290 [ 93.341987][ T8726] ? kernel_write+0x130/0x130 [ 93.346649][ T8726] ? do_syscall_64+0x26/0x760 [ 93.352087][ T8726] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 93.358148][ T8726] ? do_syscall_64+0x26/0x760 [ 93.362802][ T8726] __x64_sys_read+0x73/0xb0 [ 93.367288][ T8726] do_syscall_64+0xfa/0x760 [ 93.371797][ T8726] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 93.377675][ T8726] RIP: 0033:0x459a59 [ 93.381548][ T8726] Code: fd b7 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 cb b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 [ 93.401155][ T8726] RSP: 002b:00007f764c086c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 [ 93.409546][ T8726] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000459a59 [ 93.417497][ T8726] RDX: 00000000fffffed0 RSI: 00000000200030c0 RDI: 0000000000000003 [ 93.425446][ T8726] RBP: 000000000075bfc8 R08: 0000000000000000 R09: 0000000000000000 [ 93.433395][ T8726] R10: 0000000000000000 R11: 0000000000000246 R12: 00007f764c0876d4 [ 93.441348][ T8726] R13: 00000000004c70e6 R14: 00000000004dca70 R15: 00000000ffffffff [ 93.449308][ T8726] [ 93.451615][ T8726] Allocated by task 8726: [ 93.455927][ T8726] save_stack+0x23/0x90 [ 93.460059][ T8726] __kasan_kmalloc.constprop.0+0xcf/0xe0 [ 93.465670][ T8726] kasan_kmalloc+0x9/0x10 [ 93.469976][ T8726] kmem_cache_alloc_trace+0x158/0x790 [ 93.475325][ T8726] fuse_send_init+0x48/0x440 [ 93.479890][ T8726] fuse_fill_super+0x2a6/0x3a0 [ 93.484630][ T8726] vfs_get_super+0x13e/0x2e0 [ 93.489195][ T8726] get_tree_nodev+0x23/0x30 [ 93.493698][ T8726] fuse_get_tree+0x12e/0x190 [ 93.498274][ T8726] vfs_get_tree+0x8e/0x300 [ 93.502668][ T8726] do_mount+0x143d/0x1d10 [ 93.506976][ T8726] ksys_mount+0xdb/0x150 [ 93.511196][ T8726] __x64_sys_mount+0xbe/0x150 [ 93.515852][ T8726] do_syscall_64+0xfa/0x760 [ 93.520330][ T8726] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 93.526192][ T8726] [ 93.528496][ T8726] Freed by task 8724: [ 93.532455][ T8726] save_stack+0x23/0x90 [ 93.536593][ T8726] __kasan_slab_free+0x102/0x150 [ 93.541510][ T8726] kasan_slab_free+0xe/0x10 [ 93.545987][ T8726] kfree+0x10a/0x2c0 [ 93.549859][ T8726] process_init_reply+0xfb/0x1620 [ 93.554861][ T8726] fuse_request_end+0x388/0x990 [ 93.559687][ T8726] end_requests+0x16c/0x240 [ 93.564168][ T8726] fuse_abort_conn+0xa4d/0xdb0 [ 93.568921][ T8726] fuse_sb_destroy+0xa3/0x120 [ 93.573662][ T8726] fuse_kill_sb_anon+0x16/0x30 [ 93.578426][ T8726] deactivate_locked_super+0x95/0x100 [ 93.583772][ T8726] deactivate_super+0x1b2/0x1d0 [ 93.588595][ T8726] cleanup_mnt+0x351/0x4c0 [ 93.592987][ T8726] __cleanup_mnt+0x16/0x20 [ 93.597381][ T8726] task_work_run+0x145/0x1c0 [ 93.601948][ T8726] exit_to_usermode_loop+0x316/0x380 [ 93.607213][ T8726] do_syscall_64+0x65f/0x760 [ 93.611779][ T8726] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 93.617648][ T8726] [ 93.619959][ T8726] The buggy address belongs to the object at ffff8880a15b8400 [ 93.619959][ T8726] which belongs to the cache kmalloc-192 of size 192 [ 93.633989][ T8726] The buggy address is located 104 bytes inside of [ 93.633989][ T8726] 192-byte region [ffff8880a15b8400, ffff8880a15b84c0) [ 93.647866][ T8726] The buggy address belongs to the page: [ 93.653845][ T8726] page:ffffea0002856e00 refcount:1 mapcount:0 mapping:ffff8880aa400000 index:0x0 [ 93.662997][ T8726] flags: 0x1fffc0000000200(slab) [ 93.667919][ T8726] raw: 01fffc0000000200 ffffea000286d508 ffffea000285ba48 ffff8880aa400000 [ 93.676484][ T8726] raw: 0000000000000000 ffff8880a15b8000 0000000100000010 0000000000000000 [ 93.685040][ T8726] page dumped because: kasan: bad access detected [ 93.691423][ T8726] [ 93.693731][ T8726] Memory state around the buggy address: [ 93.699709][ T8726] ffff8880a15b8300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 93.707756][ T8726] ffff8880a15b8380: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc [ 93.715807][ T8726] >ffff8880a15b8400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 93.723858][ T8726] ^ [ 93.731300][ T8726] ffff8880a15b8480: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc [ 93.739353][ T8726] ffff8880a15b8500: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 93.747389][ T8726] ================================================================== [ 93.755422][ T8726] Disabling lock debugging due to kernel taint [ 93.764998][ T8726] Kernel panic - not syncing: panic_on_warn set ... [ 93.771596][ T8726] CPU: 1 PID: 8726 Comm: syz-executor.0 Tainted: G B 5.4.0-rc3+ #0 [ 93.780763][ T8726] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 93.790793][ T8726] Call Trace: [ 93.794064][ T8726] dump_stack+0x172/0x1f0 [ 93.798423][ T8726] panic+0x2e3/0x75c [ 93.802291][ T8726] ? add_taint.cold+0x16/0x16 [ 93.806943][ T8726] ? fuse_request_end+0x825/0x990 [ 93.811941][ T8726] ? preempt_schedule+0x4b/0x60 [ 93.816785][ T8726] ? ___preempt_schedule+0x16/0x20 [ 93.821905][ T8726] ? trace_hardirqs_on+0x5e/0x240 [ 93.826917][ T8726] ? fuse_request_end+0x825/0x990 [ 93.831912][ T8726] end_report+0x47/0x4f [ 93.836041][ T8726] ? fuse_request_end+0x825/0x990 [ 93.841038][ T8726] __kasan_report.cold+0xe/0x41 [ 93.845880][ T8726] ? fuse_request_end+0x825/0x990 [ 93.850875][ T8726] kasan_report+0x12/0x20 [ 93.855177][ T8726] __asan_report_load8_noabort+0x14/0x20 [ 93.860780][ T8726] fuse_request_end+0x825/0x990 [ 93.865602][ T8726] ? __kasan_check_read+0x11/0x20 [ 93.870598][ T8726] ? do_raw_spin_unlock+0x57/0x270 [ 93.875685][ T8726] fuse_dev_do_read.isra.0+0x115b/0x1df0 [ 93.881301][ T8726] ? __lock_acquire+0x8a0/0x4a00 [ 93.886235][ T8726] ? fuse_copy_args+0x380/0x380 [ 93.891057][ T8726] ? find_held_lock+0x35/0x130 [ 93.895797][ T8726] ? aa_file_perm+0x40b/0xeb0 [ 93.900449][ T8726] ? lock_downgrade+0x920/0x920 [ 93.905284][ T8726] ? memset+0x32/0x40 [ 93.909243][ T8726] fuse_dev_read+0x165/0x200 [ 93.913809][ T8726] ? fuse_dev_do_read.isra.0+0x1df0/0x1df0 [ 93.919588][ T8726] ? aa_file_perm+0x432/0xeb0 [ 93.924238][ T8726] ? aa_path_link+0x460/0x460 [ 93.928889][ T8726] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 93.935100][ T8726] ? iov_iter_init+0xee/0x220 [ 93.939764][ T8726] new_sync_read+0x4d7/0x800 [ 93.944329][ T8726] ? vfs_dedupe_file_range+0x780/0x780 [ 93.949774][ T8726] ? __fget+0x384/0x560 [ 93.953907][ T8726] ? security_file_permission+0x8f/0x380 [ 93.959513][ T8726] __vfs_read+0xe1/0x110 [ 93.963744][ T8726] vfs_read+0x1f0/0x440 [ 93.967875][ T8726] ksys_read+0x14f/0x290 [ 93.972091][ T8726] ? kernel_write+0x130/0x130 [ 93.976744][ T8726] ? do_syscall_64+0x26/0x760 [ 93.981399][ T8726] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 93.987442][ T8726] ? do_syscall_64+0x26/0x760 [ 93.992101][ T8726] __x64_sys_read+0x73/0xb0 [ 93.996588][ T8726] do_syscall_64+0xfa/0x760 [ 94.001067][ T8726] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 94.006931][ T8726] RIP: 0033:0x459a59 [ 94.010804][ T8726] Code: fd b7 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 cb b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 [ 94.030392][ T8726] RSP: 002b:00007f764c086c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 [ 94.038789][ T8726] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000459a59 [ 94.046735][ T8726] RDX: 00000000fffffed0 RSI: 00000000200030c0 RDI: 0000000000000003 [ 94.054694][ T8726] RBP: 000000000075bfc8 R08: 0000000000000000 R09: 0000000000000000 [ 94.062640][ T8726] R10: 0000000000000000 R11: 0000000000000246 R12: 00007f764c0876d4 [ 94.070598][ T8726] R13: 00000000004c70e6 R14: 00000000004dca70 R15: 00000000ffffffff [ 94.079827][ T8726] Kernel Offset: disabled [ 94.084181][ T8726] Rebooting in 86400 seconds..