====================================================== WARNING: possible circular locking dependency detected 4.13.0-rc6-next-20170825+ #9 Not tainted ------------------------------------------------------ kworker/u4:6/3517 is trying to acquire lock: ((complete)&rcu.completion){+.+.}, at: [] __synchronize_srcu+0x1b5/0x250 kernel/rcu/srcutree.c:898 but task is already holding lock: (slab_mutex){+.+.}, at: [] kmem_cache_destroy+0x30/0x250 mm/slab_common.c:821 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #3 (slab_mutex){+.+.}: check_prevs_add kernel/locking/lockdep.c:2020 [inline] validate_chain kernel/locking/lockdep.c:2469 [inline] __lock_acquire+0x3286/0x4620 kernel/locking/lockdep.c:3498 lock_acquire+0x1d5/0x580 kernel/locking/lockdep.c:4002 __mutex_lock_common kernel/locking/mutex.c:756 [inline] __mutex_lock+0x16f/0x1870 kernel/locking/mutex.c:893 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908 kmem_cache_create+0x39/0x2a0 mm/slab_common.c:435 ptlock_cache_init+0x24/0x2d mm/memory.c:4632 pgtable_init include/linux/mm.h:1756 [inline] mm_init init/main.c:504 [inline] start_kernel+0x3d4/0x7ad init/main.c:569 x86_64_start_reservations+0x2a/0x2c arch/x86/kernel/head64.c:381 x86_64_start_kernel+0x13c/0x149 arch/x86/kernel/head64.c:362 verify_cpu+0x0/0xfb -> #2 (memcg_cache_ids_sem){.+.+}: check_prevs_add kernel/locking/lockdep.c:2020 [inline] validate_chain kernel/locking/lockdep.c:2469 [inline] __lock_acquire+0x3286/0x4620 kernel/locking/lockdep.c:3498 lock_acquire+0x1d5/0x580 kernel/locking/lockdep.c:4002 down_read+0x96/0x150 kernel/locking/rwsem.c:23 memcg_get_cache_ids+0x10/0x20 mm/memcontrol.c:274 list_lru_destroy+0x96/0x490 mm/list_lru.c:573 deactivate_locked_super+0x94/0xd0 fs/super.c:315 deactivate_super+0x141/0x1b0 fs/super.c:339 cleanup_mnt+0xb2/0x150 fs/namespace.c:1113 mntput_no_expire+0x6e0/0xa90 fs/namespace.c:1179 mntput fs/namespace.c:1189 [inline] kern_unmount+0x9c/0xd0 fs/namespace.c:2934 pid_ns_release_proc+0x37/0x50 fs/proc/root.c:231 proc_cleanup_work+0x19/0x20 kernel/pid_namespace.c:79 process_one_work+0xbfd/0x1be0 kernel/workqueue.c:2098 worker_thread+0x223/0x1860 kernel/workqueue.c:2233 kthread+0x39c/0x470 kernel/kthread.c:231 ret_from_fork+0x2a/0x40 arch/x86/entry/entry_64.S:431 -> #1 ((&ns->proc_work)){+.+.}: process_one_work+0xba5/0x1be0 kernel/workqueue.c:2095 worker_thread+0x223/0x1860 kernel/workqueue.c:2233 kthread+0x39c/0x470 kernel/kthread.c:231 ret_from_fork+0x2a/0x40 arch/x86/entry/entry_64.S:431 0xffffffffffffffff -> #0 ((complete)&rcu.completion){+.+.}: check_prev_add+0x865/0x1520 kernel/locking/lockdep.c:1894 check_prevs_add kernel/locking/lockdep.c:2020 [inline] validate_chain kernel/locking/lockdep.c:2469 [inline] __lock_acquire+0x3286/0x4620 kernel/locking/lockdep.c:3498 lock_acquire+0x1d5/0x580 kernel/locking/lockdep.c:4002 complete_acquire include/linux/completion.h:39 [inline] __wait_for_common kernel/sched/completion.c:108 [inline] wait_for_common kernel/sched/completion.c:122 [inline] wait_for_completion+0xc8/0x770 kernel/sched/completion.c:143 __synchronize_srcu+0x1b5/0x250 kernel/rcu/srcutree.c:898 synchronize_srcu_expedited kernel/rcu/srcutree.c:923 [inline] synchronize_srcu+0x1a3/0x560 kernel/rcu/srcutree.c:974 quarantine_remove_cache+0xd7/0xf0 mm/kasan/quarantine.c:327 kasan_cache_shutdown+0x9/0x10 mm/kasan/kasan.c:381 shutdown_cache+0x15/0x1b0 mm/slab_common.c:531 kmem_cache_destroy+0x236/0x250 mm/slab_common.c:829 tipc_server_stop+0x13f/0x190 net/tipc/server.c:636 tipc_topsrv_stop+0x1fe/0x350 net/tipc/subscr.c:390 tipc_exit_net+0x15/0x40 net/tipc/core.c:96 ops_exit_list.isra.6+0xae/0x150 net/core/net_namespace.c:142 cleanup_net+0x5c7/0xb60 net/core/net_namespace.c:483 process_one_work+0xbfd/0x1be0 kernel/workqueue.c:2098 worker_thread+0x223/0x1860 kernel/workqueue.c:2233 kthread+0x39c/0x470 kernel/kthread.c:231 ret_from_fork+0x2a/0x40 arch/x86/entry/entry_64.S:431 other info that might help us debug this: Chain exists of: (complete)&rcu.completion --> memcg_cache_ids_sem --> slab_mutex Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(slab_mutex); lock(memcg_cache_ids_sem); lock(slab_mutex); lock((complete)&rcu.completion); *** DEADLOCK *** 5 locks held by kworker/u4:6/3517: #0: ("%s""netns"){.+.+}, at: [] __write_once_size include/linux/compiler.h:305 [inline] #0: ("%s""netns"){.+.+}, at: [] atomic64_set arch/x86/include/asm/atomic64_64.h:33 [inline] #0: ("%s""netns"){.+.+}, at: [] atomic_long_set include/asm-generic/atomic-long.h:56 [inline] #0: ("%s""netns"){.+.+}, at: [] set_work_data kernel/workqueue.c:617 [inline] #0: ("%s""netns"){.+.+}, at: [] set_work_pool_and_clear_pending kernel/workqueue.c:644 [inline] #0: ("%s""netns"){.+.+}, at: [] process_one_work+0xad4/0x1be0 kernel/workqueue.c:2090 #1: (net_cleanup_work){+.+.}, at: [] process_one_work+0xb2c/0x1be0 kernel/workqueue.c:2094 #2: (net_mutex){+.+.}, at: [] cleanup_net+0x247/0xb60 net/core/net_namespace.c:449 #3: (cpu_hotplug_lock.rw_sem){++++}, at: [] get_online_cpus include/linux/cpu.h:126 [inline] #3: (cpu_hotplug_lock.rw_sem){++++}, at: [] kmem_cache_destroy+0x22/0x250 mm/slab_common.c:818 #4: (slab_mutex){+.+.}, at: [] kmem_cache_destroy+0x30/0x250 mm/slab_common.c:821 stack backtrace: CPU: 0 PID: 3517 Comm: kworker/u4:6 Not tainted 4.13.0-rc6-next-20170825+ #9 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: netns cleanup_net Call Trace: __dump_stack lib/dump_stack.c:16 [inline] dump_stack+0x194/0x257 lib/dump_stack.c:52 print_circular_bug+0x503/0x710 kernel/locking/lockdep.c:1259 check_prev_add+0x865/0x1520 kernel/locking/lockdep.c:1894 check_prevs_add kernel/locking/lockdep.c:2020 [inline] validate_chain kernel/locking/lockdep.c:2469 [inline] __lock_acquire+0x3286/0x4620 kernel/locking/lockdep.c:3498 lock_acquire+0x1d5/0x580 kernel/locking/lockdep.c:4002 complete_acquire include/linux/completion.h:39 [inline] __wait_for_common kernel/sched/completion.c:108 [inline] wait_for_common kernel/sched/completion.c:122 [inline] wait_for_completion+0xc8/0x770 kernel/sched/completion.c:143 __synchronize_srcu+0x1b5/0x250 kernel/rcu/srcutree.c:898 synchronize_srcu_expedited kernel/rcu/srcutree.c:923 [inline] synchronize_srcu+0x1a3/0x560 kernel/rcu/srcutree.c:974 quarantine_remove_cache+0xd7/0xf0 mm/kasan/quarantine.c:327 kasan_cache_shutdown+0x9/0x10 mm/kasan/kasan.c:381 shutdown_cache+0x15/0x1b0 mm/slab_common.c:531 kmem_cache_destroy+0x236/0x250 mm/slab_common.c:829 tipc_server_stop+0x13f/0x190 net/tipc/server.c:636 tipc_topsrv_stop+0x1fe/0x350 net/tipc/subscr.c:390 tipc_exit_net+0x15/0x40 net/tipc/core.c:96 ops_exit_list.isra.6+0xae/0x150 net/core/net_namespace.c:142 cleanup_net+0x5c7/0xb60 net/core/net_namespace.c:483 process_one_work+0xbfd/0x1be0 kernel/workqueue.c:2098 worker_thread+0x223/0x1860 kernel/workqueue.c:2233 kthread+0x39c/0x470 kernel/kthread.c:231 ret_from_fork+0x2a/0x40 arch/x86/entry/entry_64.S:431 TCP: tcp_parse_options: Illegal window scaling value 243 > 14 received SELinux: unrecognized netlink message: protocol=0 nlmsg_type=3 sclass=netlink_route_socket pig=6381 comm=syz-executor0 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=6389 comm=syz-executor0 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=51 sclass=netlink_route_socket pig=6389 comm=syz-executor0 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=6389 comm=syz-executor0 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=3 sclass=netlink_route_socket pig=6398 comm=syz-executor0 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=6398 comm=syz-executor0 netlink: 5 bytes leftover after parsing attributes in process `syz-executor5'. IPv6: NLM_F_REPLACE set, but no existing node found! SELinux: unrecognized netlink message: protocol=0 nlmsg_type=51 sclass=netlink_route_socket pig=6403 comm=syz-executor0 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=6403 comm=syz-executor0 netlink: 5 bytes leftover after parsing attributes in process `syz-executor5'. IPv6: NLM_F_REPLACE set, but no existing node found! netlink: 11 bytes leftover after parsing attributes in process `syz-executor5'. netlink: 11 bytes leftover after parsing attributes in process `syz-executor5'. audit: type=1326 audit(1503891590.907:13): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=6559 comm="syz-executor5" exe="/root/syz-executor5" sig=9 arch=c000003e syscall=202 compat=0 ip=0x4512e9 code=0x0 audit: type=1326 audit(1503891591.063:14): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=6559 comm="syz-executor5" exe="/root/syz-executor5" sig=9 arch=c000003e syscall=202 compat=0 ip=0x4512e9 code=0x0 QAT: Invalid ioctl QAT: Invalid ioctl netlink: 1 bytes leftover after parsing attributes in process `syz-executor6'. QAT: Invalid ioctl QAT: Invalid ioctl netlink: 1 bytes leftover after parsing attributes in process `syz-executor6'. audit: type=1326 audit(1503891591.521:15): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=6680 comm="syz-executor2" exe="/root/syz-executor2" sig=31 arch=c000003e syscall=202 compat=0 ip=0x4512e9 code=0xffff0000 netlink: 21 bytes leftover after parsing attributes in process `syz-executor2'. netlink: 8 bytes leftover after parsing attributes in process `syz-executor0'. netlink: 8 bytes leftover after parsing attributes in process `syz-executor0'. netlink: 21 bytes leftover after parsing attributes in process `syz-executor2'. QAT: Invalid ioctl audit: type=1326 audit(1503891591.587:16): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=6680 comm="syz-executor2" exe="/root/syz-executor2" sig=31 arch=c000003e syscall=202 compat=0 ip=0x4512e9 code=0xffff0000 ================================================================== BUG: KASAN: use-after-free in hlist_add_head include/linux/list.h:673 [inline] BUG: KASAN: use-after-free in enqueue_timer kernel/time/timer.c:519 [inline] BUG: KASAN: use-after-free in __internal_add_timer+0x275/0x2d0 kernel/time/timer.c:530 Write of size 8 at addr ffff8801d468b688 by task syz-executor0/6757 CPU: 1 PID: 6757 Comm: syz-executor0 Not tainted 4.13.0-rc6-next-20170825+ #9 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:16 [inline] dump_stack+0x194/0x257 lib/dump_stack.c:52 print_address_description+0x73/0x250 mm/kasan/report.c:252 kasan_report_error mm/kasan/report.c:351 [inline] kasan_report+0x24e/0x340 mm/kasan/report.c:409 __asan_report_store8_noabort+0x17/0x20 mm/kasan/report.c:435 hlist_add_head include/linux/list.h:673 [inline] enqueue_timer kernel/time/timer.c:519 [inline] __internal_add_timer+0x275/0x2d0 kernel/time/timer.c:530 internal_add_timer kernel/time/timer.c:572 [inline] __mod_timer kernel/time/timer.c:1012 [inline] mod_timer+0x6e8/0xf40 kernel/time/timer.c:1059 tun_flow_init drivers/net/tun.c:1098 [inline] tun_set_iff drivers/net/tun.c:2044 [inline] __tun_chr_ioctl+0x1b2c/0x3d40 drivers/net/tun.c:2262 tun_chr_ioctl+0x2a/0x40 drivers/net/tun.c:2507 vfs_ioctl fs/ioctl.c:45 [inline] do_vfs_ioctl+0x1b1/0x1530 fs/ioctl.c:685 SYSC_ioctl fs/ioctl.c:700 [inline] SyS_ioctl+0x8f/0xc0 fs/ioctl.c:691 entry_SYSCALL_64_fastpath+0x1f/0xbe RIP: 0033:0x4512e9 RSP: 002b:00007fa68df1dc08 EFLAGS: 00000216 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000718000 RCX: 00000000004512e9 RDX: 0000000020511fd8 RSI: 00000000400454ca RDI: 0000000000000022 RBP: 0000000000003ca0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000216 R12: 00000000004b70fc R13: 00000000ffffffff R14: 0000000020000000 R15: 0000000000fff000 Allocated by task 6757: save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59 save_stack+0x43/0xd0 mm/kasan/kasan.c:447 set_track mm/kasan/kasan.c:459 [inline] kasan_kmalloc+0xad/0xe0 mm/kasan/kasan.c:551 __do_kmalloc_node mm/slab.c:3689 [inline] __kmalloc_node+0x47/0x70 mm/slab.c:3696 kmalloc_node include/linux/slab.h:535 [inline] kvmalloc_node+0x64/0xd0 mm/util.c:397 kvmalloc include/linux/mm.h:529 [inline] kvzalloc include/linux/mm.h:537 [inline] alloc_netdev_mqs+0x16e/0xed0 net/core/dev.c:8009 tun_set_iff drivers/net/tun.c:2008 [inline] __tun_chr_ioctl+0x12be/0x3d40 drivers/net/tun.c:2262 tun_chr_ioctl+0x2a/0x40 drivers/net/tun.c:2507 vfs_ioctl fs/ioctl.c:45 [inline] do_vfs_ioctl+0x1b1/0x1530 fs/ioctl.c:685 SYSC_ioctl fs/ioctl.c:700 [inline] SyS_ioctl+0x8f/0xc0 fs/ioctl.c:691 entry_SYSCALL_64_fastpath+0x1f/0xbe Freed by task 6757: save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59 save_stack+0x43/0xd0 mm/kasan/kasan.c:447 set_track mm/kasan/kasan.c:459 [inline] kasan_slab_free+0x71/0xc0 mm/kasan/kasan.c:524 __cache_free mm/slab.c:3503 [inline] kfree+0xca/0x250 mm/slab.c:3820 kvfree+0x36/0x60 mm/util.c:416 netdev_freemem net/core/dev.c:7961 [inline] free_netdev+0x2cf/0x360 net/core/dev.c:8123 tun_set_iff drivers/net/tun.c:2091 [inline] __tun_chr_ioctl+0x2cff/0x3d40 drivers/net/tun.c:2262 tun_chr_ioctl+0x2a/0x40 drivers/net/tun.c:2507 vfs_ioctl fs/ioctl.c:45 [inline] do_vfs_ioctl+0x1b1/0x1530 fs/ioctl.c:685 SYSC_ioctl fs/ioctl.c:700 [inline] SyS_ioctl+0x8f/0xc0 fs/ioctl.c:691 entry_SYSCALL_64_fastpath+0x1f/0xbe The buggy address belongs to the object at ffff8801d4688280 which belongs to the cache kmalloc-16384 of size 16384 The buggy address is located 13320 bytes inside of 16384-byte region [ffff8801d4688280, ffff8801d468c280) The buggy address belongs to the page: page:ffffea000751a200 count:1 mapcount:0 mapping:ffff8801d4688280 index:0x0 compound_mapcount: 0 flags: 0x200000000008100(slab|head) raw: 0200000000008100 ffff8801d4688280 0000000000000000 0000000100000001 raw: ffffea00072b7a20 ffffea0007234220 ffff8801dac02200 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801d468b580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8801d468b600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8801d468b680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8801d468b700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8801d468b780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================