xt_ecn: cannot match TCP bits in rule for non-tcp packets ====================================================== WARNING: possible circular locking dependency detected 4.14.224-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.3/32005 is trying to acquire lock: (&sig->cred_guard_mutex){+.+.}, at: [] lock_trace fs/proc/base.c:407 [inline] (&sig->cred_guard_mutex){+.+.}, at: [] proc_pid_stack+0x13f/0x2f0 fs/proc/base.c:457 but task is already holding lock: (&p->lock){+.+.}, at: [] seq_read+0xba/0x1120 fs/seq_file.c:165 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: IPv6: ADDRCONF(NETDEV_CHANGE): lo: link becomes ready -> #3 (&p->lock){+.+.}: __mutex_lock_common kernel/locking/mutex.c:756 [inline] __mutex_lock+0xc4/0x1310 kernel/locking/mutex.c:893 seq_read+0xba/0x1120 fs/seq_file.c:165 proc_reg_read+0xee/0x1a0 fs/proc/inode.c:217 do_loop_readv_writev fs/read_write.c:695 [inline] do_loop_readv_writev fs/read_write.c:682 [inline] do_iter_read+0x3eb/0x5b0 fs/read_write.c:919 vfs_readv+0xc8/0x120 fs/read_write.c:981 kernel_readv fs/splice.c:361 [inline] default_file_splice_read+0x418/0x910 fs/splice.c:416 do_splice_to+0xfb/0x140 fs/splice.c:880 splice_direct_to_actor+0x207/0x730 fs/splice.c:952 do_splice_direct+0x164/0x210 fs/splice.c:1061 do_sendfile+0x47f/0xb30 fs/read_write.c:1441 SYSC_sendfile64 fs/read_write.c:1502 [inline] SyS_sendfile64+0xff/0x110 fs/read_write.c:1488 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready entry_SYSCALL_64_after_hwframe+0x46/0xbb -> #2 (sb_writers#3){.+.+}: percpu_down_read_preempt_disable include/linux/percpu-rwsem.h:36 [inline] percpu_down_read include/linux/percpu-rwsem.h:59 [inline] __sb_start_write+0x64/0x260 fs/super.c:1342 sb_start_write include/linux/fs.h:1549 [inline] mnt_want_write+0x3a/0xb0 fs/namespace.c:386 IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready ovl_xattr_set+0x4d/0x290 fs/overlayfs/inode.c:214 __vfs_setxattr+0xdc/0x130 fs/xattr.c:150 __vfs_setxattr_noperm+0xfd/0x3d0 fs/xattr.c:181 __vfs_setxattr_locked+0x14d/0x250 fs/xattr.c:239 vfs_setxattr+0xcf/0x230 fs/xattr.c:256 IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready setxattr+0x1a9/0x300 fs/xattr.c:523 path_setxattr+0x118/0x130 fs/xattr.c:542 SYSC_lsetxattr fs/xattr.c:564 [inline] SyS_lsetxattr+0x33/0x40 fs/xattr.c:560 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb -> #1 (&ovl_i_mutex_dir_key[depth]){++++}: down_read+0x36/0x80 kernel/locking/rwsem.c:24 device bridge_slave_0 left promiscuous mode inode_lock_shared include/linux/fs.h:729 [inline] do_last fs/namei.c:3333 [inline] path_openat+0x149b/0x2970 fs/namei.c:3569 do_filp_open+0x179/0x3c0 fs/namei.c:3603 do_open_execat+0xd3/0x450 fs/exec.c:849 do_execveat_common+0x711/0x1f30 fs/exec.c:1755 do_execve fs/exec.c:1860 [inline] SYSC_execve fs/exec.c:1941 [inline] SyS_execve+0x3b/0x50 fs/exec.c:1936 bridge0: port 1(bridge_slave_0) entered disabled state do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb -> #0 (&sig->cred_guard_mutex){+.+.}: lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3998 __mutex_lock_common kernel/locking/mutex.c:756 [inline] __mutex_lock+0xc4/0x1310 kernel/locking/mutex.c:893 lock_trace fs/proc/base.c:407 [inline] proc_pid_stack+0x13f/0x2f0 fs/proc/base.c:457 proc_single_show+0xe7/0x150 fs/proc/base.c:761 seq_read+0x4cf/0x1120 fs/seq_file.c:237 do_loop_readv_writev fs/read_write.c:695 [inline] do_loop_readv_writev fs/read_write.c:682 [inline] do_iter_read+0x3eb/0x5b0 fs/read_write.c:919 vfs_readv+0xc8/0x120 fs/read_write.c:981 do_preadv fs/read_write.c:1065 [inline] SYSC_preadv fs/read_write.c:1115 [inline] SyS_preadv+0x15a/0x200 fs/read_write.c:1110 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb other info that might help us debug this: Chain exists of: &sig->cred_guard_mutex --> sb_writers#3 --> &p->lock Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&p->lock); lock(sb_writers#3); lock(&p->lock); lock(&sig->cred_guard_mutex); *** DEADLOCK *** 1 lock held by syz-executor.3/32005: #0: (&p->lock){+.+.}, at: [] seq_read+0xba/0x1120 fs/seq_file.c:165 stack backtrace: CPU: 0 PID: 32005 Comm: syz-executor.3 Not tainted 4.14.224-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x1b2/0x281 lib/dump_stack.c:58 print_circular_bug.constprop.0.cold+0x2d7/0x41e kernel/locking/lockdep.c:1258 check_prev_add kernel/locking/lockdep.c:1905 [inline] check_prevs_add kernel/locking/lockdep.c:2022 [inline] validate_chain kernel/locking/lockdep.c:2464 [inline] __lock_acquire+0x2e0e/0x3f20 kernel/locking/lockdep.c:3491 lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3998 __mutex_lock_common kernel/locking/mutex.c:756 [inline] __mutex_lock+0xc4/0x1310 kernel/locking/mutex.c:893 lock_trace fs/proc/base.c:407 [inline] proc_pid_stack+0x13f/0x2f0 fs/proc/base.c:457 proc_single_show+0xe7/0x150 fs/proc/base.c:761 seq_read+0x4cf/0x1120 fs/seq_file.c:237 do_loop_readv_writev fs/read_write.c:695 [inline] do_loop_readv_writev fs/read_write.c:682 [inline] do_iter_read+0x3eb/0x5b0 fs/read_write.c:919 vfs_readv+0xc8/0x120 fs/read_write.c:981 do_preadv fs/read_write.c:1065 [inline] SYSC_preadv fs/read_write.c:1115 [inline] SyS_preadv+0x15a/0x200 fs/read_write.c:1110 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x465f69 RSP: 002b:00007f32f58a1188 EFLAGS: 00000246 ORIG_RAX: 0000000000000127 RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 0000000000465f69 RDX: 0000000000000375 RSI: 00000000200017c0 RDI: 0000000000000005 RBP: 00000000004bfa67 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60 R13: 00007ffda43016cf R14: 00007f32f58a1300 R15: 0000000000022000 device bridge_slave_1 left promiscuous mode bridge0: port 2(bridge_slave_1) entered disabled state bond0: Releasing backup interface bond_slave_0 bond0: Releasing backup interface bond_slave_1 team0: Port device team_slave_0 removed team0: Port device team_slave_1 removed batman_adv: batadv0: Interface deactivated: batadv_slave_0 batman_adv: batadv0: Removing interface: batadv_slave_0 batman_adv: batadv0: Interface deactivated: batadv_slave_1 batman_adv: batadv0: Removing interface: batadv_slave_1 IPv6: ADDRCONF(NETDEV_CHANGE): lo: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready netlink: 43799 bytes leftover after parsing attributes in process `syz-executor.3'. netlink: 43799 bytes leftover after parsing attributes in process `syz-executor.3'. netlink: 43799 bytes leftover after parsing attributes in process `syz-executor.3'. IPv6: ADDRCONF(NETDEV_CHANGE): lo: link becomes ready netlink: 43799 bytes leftover after parsing attributes in process `syz-executor.3'. IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready netlink: 43799 bytes leftover after parsing attributes in process `syz-executor.3'. netlink: 12 bytes leftover after parsing attributes in process `syz-executor.1'. netlink: 43799 bytes leftover after parsing attributes in process `syz-executor.3'. IPv6: ADDRCONF(NETDEV_CHANGE): lo: link becomes ready netlink: 43799 bytes leftover after parsing attributes in process `syz-executor.3'. IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready netlink: 43799 bytes leftover after parsing attributes in process `syz-executor.3'. tmpfs: Bad mount option smackfsroot netlink: 3852 bytes leftover after parsing attributes in process `syz-executor.1'. netlink: 12 bytes leftover after parsing attributes in process `syz-executor.5'. netlink: 95 bytes leftover after parsing attributes in process `syz-executor.3'. tc_ctl_action: received NO action attribs netlink: 95 bytes leftover after parsing attributes in process `syz-executor.3'. tc_ctl_action: received NO action attribs tmpfs: Bad mount option smackfsroot netlink: 12 bytes leftover after parsing attributes in process `syz-executor.1'. tc_ctl_action: received NO action attribs tmpfs: Bad mount option smackfsroot tmpfs: Bad mount option smackfsroot tmpfs: Bad mount option smackfsroot tmpfs: Bad mount option smackfsroot tmpfs: Bad mount option smackfsroot nla_parse: 11 callbacks suppressed netlink: 95 bytes leftover after parsing attributes in process `syz-executor.3'. tc_ctl_action: received NO action attribs netlink: 95 bytes leftover after parsing attributes in process `syz-executor.3'. tmpfs: Bad mount option smackfsroot tc_ctl_action: received NO action attribs tmpfs: Bad mount option smackfsroot netlink: 95 bytes leftover after parsing attributes in process `syz-executor.3'. tc_ctl_action: received NO action attribs netlink: 95 bytes leftover after parsing attributes in process `syz-executor.3'. tc_ctl_action: received NO action attribs netlink: 95 bytes leftover after parsing attributes in process `syz-executor.3'. tc_ctl_action: received NO action attribs tmpfs: Bad mount option smackfsroot netlink: 95 bytes leftover after parsing attributes in process `syz-executor.3'. tc_ctl_action: received NO action attribs netlink: 44639 bytes leftover after parsing attributes in process `syz-executor.3'. tmpfs: Bad mount option smackfsroot tc_ctl_action: received NO action attribs netlink: 44639 bytes leftover after parsing attributes in process `syz-executor.3'. netlink: 12 bytes leftover after parsing attributes in process `syz-executor.1'. tc_ctl_action: received NO action attribs