Warning: Permanently added '[localhost]:30501' (ECDSA) to the list of known hosts. [ 185.341787][ T41] audit: type=1400 audit(1592933787.222:42): avc: denied { map } for pid=11862 comm="syz-fuzzer" path="/syz-fuzzer" dev="sda1" ino=16525 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:file_t:s0 tclass=file permissive=1 2020/06/23 17:36:27 fuzzer started 2020/06/23 17:36:28 connecting to host at 10.0.2.10:39821 2020/06/23 17:36:28 checking machine... 2020/06/23 17:36:28 checking revisions... 2020/06/23 17:36:28 testing simple program... [ 186.232142][ T41] audit: type=1400 audit(1592933788.112:43): avc: denied { integrity } for pid=11862 comm="syz-fuzzer" lockdown_reason="debugfs access" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=lockdown permissive=1 [ 186.364870][ T41] audit: type=1400 audit(1592933788.112:44): avc: denied { map } for pid=11862 comm="syz-fuzzer" path="/sys/kernel/debug/kcov" dev="debugfs" ino=24590 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:debugfs_t:s0 tclass=file permissive=1 [ 188.889573][T11880] IPVS: ftp: loaded support on port[0] = 21 executing program 2020/06/23 17:36:31 building call list... [ 189.775939][ T1811] tipc: TX() has been purged, node left! [ 191.066148][ T1811] ================================================================== [ 191.074430][ T1811] BUG: KASAN: use-after-free in afs_wake_up_async_call+0x6aa/0x770 [ 191.074430][ T1811] Write of size 1 at addr ffff8880219271e4 by task kworker/u16:1/1811 [ 191.074430][ T1811] [ 191.074430][ T1811] CPU: 0 PID: 1811 Comm: kworker/u16:1 Not tainted 5.8.0-rc2-syzkaller #0 [ 191.074430][ T1811] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014 [ 191.074430][ T1811] Workqueue: netns cleanup_net [ 191.074430][ T1811] Call Trace: [ 191.074430][ T1811] dump_stack+0x18f/0x20d [ 191.074430][ T1811] ? afs_wake_up_async_call+0x6aa/0x770 [ 191.074430][ T1811] ? afs_wake_up_async_call+0x6aa/0x770 [ 191.074430][ T1811] ? afs_put_call+0xa40/0xa40 [ 191.074430][ T1811] print_address_description.constprop.0.cold+0xd3/0x413 [ 191.074430][ T1811] ? vprintk_func+0x97/0x1a6 [ 191.074430][ T1811] ? afs_wake_up_async_call+0x6aa/0x770 [ 191.074430][ T1811] kasan_report.cold+0x1f/0x37 [ 191.074430][ T1811] ? rcu_read_lock_held_common+0x71/0xa0 [ 191.074430][ T1811] ? afs_wake_up_async_call+0x6aa/0x770 [ 191.074430][ T1811] afs_wake_up_async_call+0x6aa/0x770 [ 191.074430][ T1811] ? afs_close_socket+0x320/0x320 [ 191.074430][ T1811] ? afs_put_call+0xa40/0xa40 [ 192.215131][ T1811] rxrpc_notify_socket+0x1db/0x5d0 [ 192.215131][ T1811] ? afs_put_call+0xa40/0xa40 [ 192.215131][ T1811] __rxrpc_set_call_completion.part.0+0x172/0x410 [ 192.215131][ T1811] rxrpc_call_completed+0xca/0xf0 [ 192.215131][ T1811] rxrpc_discard_prealloc+0x781/0xab0 [ 192.215131][ T1811] ? lock_sock_nested+0x94/0x110 [ 192.215131][ T1811] rxrpc_listen+0x147/0x360 [ 192.215131][ T1811] afs_close_socket+0x95/0x320 [ 192.215131][ T1811] ? afs_purge_servers+0x181/0x330 [ 192.215131][ T1811] ? afs_rx_discard_new_call+0x50/0x50 [ 192.215131][ T1811] ? init_wait_var_entry+0x200/0x200 [ 192.215131][ T1811] afs_net_exit+0x1c4/0x310 [ 192.215131][ T1811] ? afs_net_init+0xe90/0xe90 [ 192.215131][ T1811] ops_exit_list.isra.0+0xa8/0x150 [ 192.215131][ T1811] cleanup_net+0x511/0xa50 [ 192.215131][ T1811] ? unregister_pernet_device+0x70/0x70 [ 192.215131][ T1811] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 192.215131][ T1811] process_one_work+0x965/0x1690 [ 192.215131][ T1811] ? lock_release+0x800/0x800 [ 192.215131][ T1811] ? pwq_dec_nr_in_flight+0x310/0x310 [ 192.215131][ T1811] ? rwlock_bug.part.0+0x90/0x90 [ 192.215131][ T1811] worker_thread+0x96/0xe10 [ 192.215131][ T1811] ? process_one_work+0x1690/0x1690 [ 192.215131][ T1811] kthread+0x3b5/0x4a0 [ 192.215131][ T1811] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 192.215131][ T1811] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 192.215131][ T1811] ret_from_fork+0x1f/0x30 [ 192.215131][ T1811] [ 192.215131][ T1811] Allocated by task 11880: [ 192.215131][ T1811] save_stack+0x1b/0x40 [ 192.215131][ T1811] __kasan_kmalloc.constprop.0+0xbf/0xd0 [ 192.215131][ T1811] kmem_cache_alloc_trace+0x153/0x7d0 [ 192.215131][ T1811] afs_alloc_call+0x55/0x630 [ 192.215131][ T1811] afs_charge_preallocation+0xe9/0x2d0 [ 192.215131][ T1811] afs_open_socket+0x292/0x360 [ 194.213149][ T1811] afs_net_init+0xab4/0xe90 [ 194.213149][ T1811] ops_init+0xaf/0x420 [ 194.213149][ T1811] setup_net+0x2de/0x860 [ 194.213149][ T1811] copy_net_ns+0x293/0x590 [ 194.213149][ T1811] create_new_namespaces+0x3fb/0xb30 [ 194.213149][ T1811] unshare_nsproxy_namespaces+0xbd/0x1f0 [ 194.213149][ T1811] ksys_unshare+0x43d/0x8e0 [ 194.213149][ T1811] __x64_sys_unshare+0x2d/0x40 [ 194.213149][ T1811] do_syscall_64+0x60/0xe0 [ 194.213149][ T1811] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 194.213149][ T1811] [ 194.213149][ T1811] Freed by task 1811: [ 194.213149][ T1811] save_stack+0x1b/0x40 [ 194.213149][ T1811] __kasan_slab_free+0xf7/0x140 [ 194.213149][ T1811] kfree+0x109/0x2b0 [ 194.213149][ T1811] afs_put_call+0x585/0xa40 [ 194.213149][ T1811] rxrpc_discard_prealloc+0x764/0xab0 [ 194.213149][ T1811] rxrpc_listen+0x147/0x360 [ 194.213149][ T1811] afs_close_socket+0x95/0x320 [ 194.213149][ T1811] afs_net_exit+0x1c4/0x310 [ 194.213149][ T1811] ops_exit_list.isra.0+0xa8/0x150 [ 194.213149][ T1811] cleanup_net+0x511/0xa50 [ 194.213149][ T1811] process_one_work+0x965/0x1690 [ 194.213149][ T1811] worker_thread+0x96/0xe10 [ 194.213149][ T1811] kthread+0x3b5/0x4a0 [ 194.213149][ T1811] ret_from_fork+0x1f/0x30 [ 194.213149][ T1811] [ 194.213149][ T1811] The buggy address belongs to the object at ffff888021927000 [ 194.213149][ T1811] which belongs to the cache kmalloc-1k of size 1024 [ 194.213149][ T1811] The buggy address is located 484 bytes inside of [ 194.213149][ T1811] 1024-byte region [ffff888021927000, ffff888021927400) [ 194.213149][ T1811] The buggy address belongs to the page: [ 194.213149][ T1811] page:ffffea00008649c0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 [ 194.213149][ T1811] flags: 0xfffe0000000200(slab) [ 194.213149][ T1811] raw: 00fffe0000000200 ffffea00009f4048 ffffea0000443008 ffff88802c800c40 [ 194.213149][ T1811] raw: 0000000000000000 ffff888021927000 0000000100000002 0000000000000000 [ 194.213149][ T1811] page dumped because: kasan: bad access detected [ 194.213149][ T1811] [ 194.213149][ T1811] Memory state around the buggy address: [ 194.213149][ T1811] ffff888021927080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 194.213149][ T1811] ffff888021927100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 194.213149][ T1811] >ffff888021927180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 194.213149][ T1811] ^ [ 194.213149][ T1811] ffff888021927200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 196.293217][ T1811] ffff888021927280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 196.293217][ T1811] ================================================================== [ 196.293217][ T1811] Disabling lock debugging due to kernel taint [ 196.527465][ T1811] Kernel panic - not syncing: panic_on_warn set ... [ 196.535544][ T1811] CPU: 0 PID: 1811 Comm: kworker/u16:1 Tainted: G B 5.8.0-rc2-syzkaller #0 [ 196.535544][ T1811] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014 [ 196.535544][ T1811] Workqueue: netns cleanup_net [ 196.535544][ T1811] Call Trace: [ 196.535544][ T1811] dump_stack+0x18f/0x20d [ 196.535544][ T1811] ? afs_wake_up_async_call+0x5e0/0x770 [ 196.535544][ T1811] ? afs_put_call+0xa40/0xa40 [ 196.535544][ T1811] panic+0x2e3/0x75c [ 196.535544][ T1811] ? __warn_printk+0xf3/0xf3 [ 196.535544][ T1811] ? asm_common_interrupt+0x1e/0x40 [ 196.535544][ T1811] ? trace_hardirqs_on+0x55/0x220 [ 196.535544][ T1811] ? afs_wake_up_async_call+0x6aa/0x770 [ 196.535544][ T1811] ? afs_wake_up_async_call+0x6aa/0x770 [ 196.535544][ T1811] ? afs_put_call+0xa40/0xa40 [ 196.535544][ T1811] end_report+0x4d/0x53 [ 196.535544][ T1811] kasan_report.cold+0xd/0x37 [ 196.535544][ T1811] ? rcu_read_lock_held_common+0x71/0xa0 [ 196.535544][ T1811] ? afs_wake_up_async_call+0x6aa/0x770 [ 196.535544][ T1811] afs_wake_up_async_call+0x6aa/0x770 [ 196.535544][ T1811] ? afs_close_socket+0x320/0x320 [ 196.535544][ T1811] ? afs_put_call+0xa40/0xa40 [ 196.535544][ T1811] rxrpc_notify_socket+0x1db/0x5d0 [ 196.535544][ T1811] ? afs_put_call+0xa40/0xa40 [ 196.535544][ T1811] __rxrpc_set_call_completion.part.0+0x172/0x410 [ 196.535544][ T1811] rxrpc_call_completed+0xca/0xf0 [ 196.535544][ T1811] rxrpc_discard_prealloc+0x781/0xab0 [ 196.535544][ T1811] ? lock_sock_nested+0x94/0x110 [ 196.535544][ T1811] rxrpc_listen+0x147/0x360 [ 196.535544][ T1811] afs_close_socket+0x95/0x320 [ 196.535544][ T1811] ? afs_purge_servers+0x181/0x330 [ 196.535544][ T1811] ? afs_rx_discard_new_call+0x50/0x50 [ 196.535544][ T1811] ? init_wait_var_entry+0x200/0x200 [ 196.535544][ T1811] afs_net_exit+0x1c4/0x310 [ 196.535544][ T1811] ? afs_net_init+0xe90/0xe90 [ 196.535544][ T1811] ops_exit_list.isra.0+0xa8/0x150 [ 196.535544][ T1811] cleanup_net+0x511/0xa50 [ 196.535544][ T1811] ? unregister_pernet_device+0x70/0x70 [ 196.535544][ T1811] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 196.535544][ T1811] process_one_work+0x965/0x1690 [ 196.535544][ T1811] ? lock_release+0x800/0x800 [ 196.535544][ T1811] ? pwq_dec_nr_in_flight+0x310/0x310 [ 196.535544][ T1811] ? rwlock_bug.part.0+0x90/0x90 [ 196.535544][ T1811] worker_thread+0x96/0xe10 [ 196.535544][ T1811] ? process_one_work+0x1690/0x1690 [ 196.535544][ T1811] kthread+0x3b5/0x4a0 [ 196.535544][ T1811] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 196.535544][ T1811] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 196.535544][ T1811] ret_from_fork+0x1f/0x30 [ 196.535544][ T1811] Kernel Offset: disabled [ 196.535544][ T1811] Rebooting in 86400 seconds..