xt_CT: netfilter: NOTRACK target is deprecated, use CT instead or upgrade iptables IPVS: ftp: loaded support on port[0] = 21 EXT4-fs (loop4): VFS: Can't find ext4 filesystem raw_sendmsg: syz-executor.2 forgot to set AF_INET. Fix it! ====================================================== WARNING: possible circular locking dependency detected 4.19.195-syzkaller #0 Not tainted ------------------------------------------------------ kworker/u4:2/36 is trying to acquire lock: 0000000033ebde92 ((wq_completion)"events"){+.+.}, at: flush_workqueue+0xe8/0x13e0 kernel/workqueue.c:2658 but task is already holding lock: 0000000092b7db9e (pernet_ops_rwsem){++++}, at: cleanup_net+0xa8/0x8b0 net/core/net_namespace.c:520 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #3 (pernet_ops_rwsem){++++}: unregister_netdevice_notifier+0x7b/0x330 net/core/dev.c:1708 raw_release+0x58/0x820 net/can/raw.c:358 __sock_release+0xcd/0x2a0 net/socket.c:579 sock_close+0x15/0x20 net/socket.c:1140 __fput+0x2ce/0x890 fs/file_table.c:278 task_work_run+0x148/0x1c0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:193 [inline] exit_to_usermode_loop+0x251/0x2a0 arch/x86/entry/common.c:167 prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline] syscall_return_slowpath arch/x86/entry/common.c:271 [inline] do_syscall_64+0x538/0x620 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe -> #2 (&sb->s_type->i_mutex_key#13){+.+.}: inode_lock include/linux/fs.h:748 [inline] __sock_release+0x86/0x2a0 net/socket.c:578 sock_close+0x15/0x20 net/socket.c:1140 __fput+0x2ce/0x890 fs/file_table.c:278 delayed_fput+0x56/0x70 fs/file_table.c:304 process_one_work+0x864/0x1570 kernel/workqueue.c:2153 worker_thread+0x64c/0x1130 kernel/workqueue.c:2296 kthread+0x33f/0x460 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 -> #1 ((delayed_fput_work).work){+.+.}: worker_thread+0x64c/0x1130 kernel/workqueue.c:2296 kthread+0x33f/0x460 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 -> #0 ((wq_completion)"events"){+.+.}: flush_workqueue+0x117/0x13e0 kernel/workqueue.c:2661 flush_scheduled_work include/linux/workqueue.h:599 [inline] tipc_exit_net+0x38/0x60 net/tipc/core.c:100 ops_exit_list+0xa5/0x150 net/core/net_namespace.c:153 cleanup_net+0x3b4/0x8b0 net/core/net_namespace.c:553 process_one_work+0x864/0x1570 kernel/workqueue.c:2153 worker_thread+0x64c/0x1130 kernel/workqueue.c:2296 kthread+0x33f/0x460 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 other info that might help us debug this: Chain exists of: (wq_completion)"events" --> &sb->s_type->i_mutex_key#13 --> pernet_ops_rwsem Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(pernet_ops_rwsem); lock(&sb->s_type->i_mutex_key#13); lock(pernet_ops_rwsem); lock((wq_completion)"events"); *** DEADLOCK *** 3 locks held by kworker/u4:2/36: #0: 00000000fb6ebca0 ((wq_completion)"%s""netns"){+.+.}, at: process_one_work+0x767/0x1570 kernel/workqueue.c:2124 #1: 00000000e3425f5a (net_cleanup_work){+.+.}, at: process_one_work+0x79c/0x1570 kernel/workqueue.c:2128 #2: 0000000092b7db9e (pernet_ops_rwsem){++++}, at: cleanup_net+0xa8/0x8b0 net/core/net_namespace.c:520 stack backtrace: CPU: 0 PID: 36 Comm: kworker/u4:2 Not tainted 4.19.195-syzkaller #0 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:77 [inline] dump_stack+0x1fc/0x2ef lib/dump_stack.c:118 print_circular_bug.constprop.0.cold+0x2d7/0x41e kernel/locking/lockdep.c:1222 check_prev_add kernel/locking/lockdep.c:1866 [inline] check_prevs_add kernel/locking/lockdep.c:1979 [inline] validate_chain kernel/locking/lockdep.c:2420 [inline] __lock_acquire+0x30c9/0x3ff0 kernel/locking/lockdep.c:3416 lock_acquire+0x170/0x3c0 kernel/locking/lockdep.c:3908 flush_workqueue+0x117/0x13e0 kernel/workqueue.c:2661 flush_scheduled_work include/linux/workqueue.h:599 [inline] tipc_exit_net+0x38/0x60 net/tipc/core.c:100 ops_exit_list+0xa5/0x150 net/core/net_namespace.c:153 cleanup_net+0x3b4/0x8b0 net/core/net_namespace.c:553 process_one_work+0x864/0x1570 kernel/workqueue.c:2153 worker_thread+0x64c/0x1130 kernel/workqueue.c:2296 kthread+0x33f/0x460 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 EXT4-fs (loop5): VFS: Can't find ext4 filesystem netlink: 'syz-executor.0': attribute type 21 has an invalid length. netlink: 'syz-executor.0': attribute type 4 has an invalid length. audit: type=1804 audit(1624810560.948:36): pid=28521 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.5" name="/root/syzkaller-testdir778030120/syzkaller.srwNWC/1011/cgroup.controllers" dev="sda1" ino=15446 res=1 netlink: 156 bytes leftover after parsing attributes in process `syz-executor.0'. netlink: 'syz-executor.0': attribute type 21 has an invalid length. netlink: 'syz-executor.0': attribute type 4 has an invalid length. netlink: 156 bytes leftover after parsing attributes in process `syz-executor.0'. audit: type=1804 audit(1624810561.228:37): pid=28521 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.5" name="/root/syzkaller-testdir778030120/syzkaller.srwNWC/1011/cgroup.controllers" dev="sda1" ino=15446 res=1 netlink: 13 bytes leftover after parsing attributes in process `syz-executor.5'. netlink: 13 bytes leftover after parsing attributes in process `syz-executor.5'. netlink: 13 bytes leftover after parsing attributes in process `syz-executor.5'. gfs2: invalid mount option: audit gfs2: can't parse mount arguments gfs2: invalid mount option: audit gfs2: can't parse mount arguments gfs2: invalid mount option: audit gfs2: can't parse mount arguments gfs2: invalid mount option: audit gfs2: can't parse mount arguments caif:caif_disconnect_client(): nothing to disconnect caif:caif_disconnect_client(): nothing to disconnect gfs2: invalid mount option: audit gfs2: can't parse mount arguments device lo entered promiscuous mode netlink: 'syz-executor.2': attribute type 25 has an invalid length. netlink: 20 bytes leftover after parsing attributes in process `syz-executor.2'. UDF-fs: error (device loop5): udf_process_sequence: Primary Volume Descriptor not found! UDF-fs: INFO Mounting volume 'LinuxUDF', timestamp 2020/09/19 18:44 (1000) Y4`Ҙ: renamed from lo xt_nfacct: accounting object `syz0' does not exists new mount options do not match the existing superblock, will be ignored xt_nfacct: accounting object `syz0' does not exists UDF-fs: error (device loop5): udf_process_sequence: Primary Volume Descriptor not found! new mount options do not match the existing superblock, will be ignored UDF-fs: INFO Mounting volume 'LinuxUDF', timestamp 2020/09/19 18:44 (1000) new mount options do not match the existing superblock, will be ignored EXT4-fs error (device loop2): ext4_get_journal_inode:4700: comm syz-executor.2: inode #4043046656: comm syz-executor.2: iget: illegal inode # EXT4-fs (loop2): no journal found EXT4-fs (loop2): can't get journal size EXT4-fs error (device loop2): ext4_fill_super:4443: inode #2: comm syz-executor.2: iget: root inode unallocated EXT4-fs (loop2): get root inode failed EXT4-fs (loop2): mount failed new mount options do not match the existing superblock, will be ignored EXT4-fs error (device loop2): ext4_get_journal_inode:4700: comm syz-executor.2: inode #4043046656: comm syz-executor.2: iget: illegal inode # new mount options do not match the existing superblock, will be ignored EXT4-fs (loop2): no journal found EXT4-fs (loop2): can't get journal size UDF-fs: error (device loop5): udf_process_sequence: Primary Volume Descriptor not found! EXT4-fs error (device loop2): ext4_fill_super:4443: inode #2: comm syz-executor.2: iget: root inode unallocated UDF-fs: INFO Mounting volume 'LinuxUDF', timestamp 2020/09/19 18:44 (1000) EXT4-fs (loop2): get root inode failed EXT4-fs (loop2): mount failed audit: type=1800 audit(1624810569.878:38): pid=29113 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.5" name="file0" dev="sda1" ino=14290 res=0