netlink: 'syz-executor.4': attribute type 4 has an invalid length. ====================================================== WARNING: possible circular locking dependency detected 4.19.211-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.0/7404 is trying to acquire lock: 000000009fc3924a (&sig->cred_guard_mutex){+.+.}, at: lock_trace fs/proc/base.c:402 [inline] 000000009fc3924a (&sig->cred_guard_mutex){+.+.}, at: proc_pid_personality+0x4a/0x170 fs/proc/base.c:2938 but task is already holding lock: 000000003a9f4a53 (&p->lock){+.+.}, at: seq_read+0x6b/0x11c0 fs/seq_file.c:164 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #3 (&p->lock){+.+.}: 9pnet: p9_errstr2errno: server reported unknown error žđ˙ seq_read+0x6b/0x11c0 fs/seq_file.c:164 proc_reg_read+0x1bd/0x2d0 fs/proc/inode.c:231 do_loop_readv_writev fs/read_write.c:701 [inline] do_loop_readv_writev fs/read_write.c:688 [inline] do_iter_read+0x471/0x630 fs/read_write.c:925 vfs_readv+0xe5/0x150 fs/read_write.c:987 kernel_readv fs/splice.c:362 [inline] default_file_splice_read+0x457/0xa00 fs/splice.c:417 do_splice_to+0x10e/0x160 fs/splice.c:881 splice_direct_to_actor+0x2b9/0x8d0 fs/splice.c:959 do_splice_direct+0x1a7/0x270 fs/splice.c:1068 do_sendfile+0x550/0xc30 fs/read_write.c:1447 __do_sys_sendfile64 fs/read_write.c:1508 [inline] __se_sys_sendfile64+0x147/0x160 fs/read_write.c:1494 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe -> #2 (sb_writers#3){.+.+}: sb_start_write include/linux/fs.h:1579 [inline] mnt_want_write+0x3a/0xb0 fs/namespace.c:360 ovl_xattr_set+0x53/0x600 fs/overlayfs/inode.c:338 __vfs_setxattr+0x10e/0x170 fs/xattr.c:149 __vfs_setxattr_noperm+0x11a/0x420 fs/xattr.c:180 __vfs_setxattr_locked+0x176/0x250 fs/xattr.c:238 vfs_setxattr+0xe5/0x270 fs/xattr.c:255 setxattr+0x23d/0x330 fs/xattr.c:520 path_setxattr+0x170/0x190 fs/xattr.c:539 __do_sys_lsetxattr fs/xattr.c:561 [inline] __se_sys_lsetxattr fs/xattr.c:557 [inline] __x64_sys_lsetxattr+0xbd/0x150 fs/xattr.c:557 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe -> #1 (&ovl_i_mutex_dir_key[depth]#2){++++}: inode_lock_shared include/linux/fs.h:758 [inline] do_last fs/namei.c:3326 [inline] path_openat+0x17ec/0x2df0 fs/namei.c:3537 do_filp_open+0x18c/0x3f0 fs/namei.c:3567 do_open_execat+0x11d/0x5b0 fs/exec.c:853 __do_execve_file+0x1a8b/0x2360 fs/exec.c:1770 do_execveat_common fs/exec.c:1879 [inline] do_execve+0x35/0x50 fs/exec.c:1896 __do_sys_execve fs/exec.c:1977 [inline] __se_sys_execve fs/exec.c:1972 [inline] __x64_sys_execve+0x7c/0xa0 fs/exec.c:1972 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe -> #0 (&sig->cred_guard_mutex){+.+.}: __mutex_lock_common kernel/locking/mutex.c:937 [inline] __mutex_lock+0xd7/0x1190 kernel/locking/mutex.c:1078 lock_trace fs/proc/base.c:402 [inline] proc_pid_personality+0x4a/0x170 fs/proc/base.c:2938 proc_single_show+0xeb/0x170 fs/proc/base.c:755 seq_read+0x4e0/0x11c0 fs/seq_file.c:232 do_loop_readv_writev fs/read_write.c:701 [inline] do_loop_readv_writev fs/read_write.c:688 [inline] do_iter_read+0x471/0x630 fs/read_write.c:925 vfs_readv+0xe5/0x150 fs/read_write.c:987 kernel_readv fs/splice.c:362 [inline] default_file_splice_read+0x457/0xa00 fs/splice.c:417 do_splice_to+0x10e/0x160 fs/splice.c:881 splice_direct_to_actor+0x2b9/0x8d0 fs/splice.c:959 do_splice_direct+0x1a7/0x270 fs/splice.c:1068 do_sendfile+0x550/0xc30 fs/read_write.c:1447 __do_sys_sendfile64 fs/read_write.c:1508 [inline] __se_sys_sendfile64+0x147/0x160 fs/read_write.c:1494 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe 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 *** 2 locks held by syz-executor.0/7404: #0: 000000002a2560f3 (sb_writers#3){.+.+}, at: file_start_write include/linux/fs.h:2779 [inline] #0: 000000002a2560f3 (sb_writers#3){.+.+}, at: do_sendfile+0x97d/0xc30 fs/read_write.c:1446 #1: 000000003a9f4a53 (&p->lock){+.+.}, at: seq_read+0x6b/0x11c0 fs/seq_file.c:164 stack backtrace: CPU: 1 PID: 7404 Comm: syz-executor.0 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 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 __mutex_lock_common kernel/locking/mutex.c:937 [inline] __mutex_lock+0xd7/0x1190 kernel/locking/mutex.c:1078 lock_trace fs/proc/base.c:402 [inline] proc_pid_personality+0x4a/0x170 fs/proc/base.c:2938 proc_single_show+0xeb/0x170 fs/proc/base.c:755 seq_read+0x4e0/0x11c0 fs/seq_file.c:232 do_loop_readv_writev fs/read_write.c:701 [inline] do_loop_readv_writev fs/read_write.c:688 [inline] do_iter_read+0x471/0x630 fs/read_write.c:925 vfs_readv+0xe5/0x150 fs/read_write.c:987 kernel_readv fs/splice.c:362 [inline] default_file_splice_read+0x457/0xa00 fs/splice.c:417 do_splice_to+0x10e/0x160 fs/splice.c:881 splice_direct_to_actor+0x2b9/0x8d0 fs/splice.c:959 do_splice_direct+0x1a7/0x270 fs/splice.c:1068 do_sendfile+0x550/0xc30 fs/read_write.c:1447 __do_sys_sendfile64 fs/read_write.c:1508 [inline] __se_sys_sendfile64+0x147/0x160 fs/read_write.c:1494 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f8097116049 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f8095a8b168 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 00007f8097228f60 RCX: 00007f8097116049 RDX: 0000000000000000 RSI: 0000000000000003 RDI: 0000000000000004 RBP: 00007f809717008d R08: 0000000000000000 R09: 0000000000000000 R10: 000000000000f6c4 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fff00a4184f R14: 00007f8095a8b300 R15: 0000000000022000 input: syz1 as /devices/virtual/input/input14 base_sock_release(00000000d8031629) sk=0000000023414ca3 base_sock_release(00000000595ba821) sk=000000009eeedfc4 input: syz1 as /devices/virtual/input/input15 audit: type=1800 audit(1647217944.949:474): pid=7548 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.5" name="file0" dev="sda1" ino=13959 res=0 audit: type=1804 audit(1647217944.949:475): pid=7548 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.5" name="/root/syzkaller-testdir1795645821/syzkaller.pprCxT/432/file0" dev="sda1" ino=13959 res=1 IPVS: ftp: loaded support on port[0] = 21 device Y­4`Ō˜ left promiscuous mode IPv6: ADDRCONF(NETDEV_CHANGE): Y­4`Ō˜: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): Y­4`Ō˜: link becomes ready GRED: Unable to relocate VQ 0x0 after dequeue, screwing up backlog IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready device bond0 left promiscuous mode device bond_slave_0 left promiscuous mode device bond_slave_1 left promiscuous mode 8021q: adding VLAN 0 to HW filter on device bond0 chnl_net:chnl_net_open(): err: Unable to register and open device, Err:-19 caif:caif_disconnect_client(): nothing to disconnect chnl_net:chnl_flowctrl_cb(): NET flowctrl func called flow: CLOSE/DEINIT chnl_net:chnl_net_open(): state disconnected A link change request failed with some changes committed already. Interface caif0 may have been left with an inconsistent configuration, please check. GRED: Unable to relocate VQ 0x0 after dequeue, screwing up backlog IPVS: ftp: loaded support on port[0] = 21 IPv6: ADDRCONF(NETDEV_CHANGE): Y­4`Ō˜: link becomes ready audit: type=1800 audit(1647217947.979:476): pid=7619 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.5" name="file0" dev="sda1" ino=14994 res=0 input: syz1 as /devices/virtual/input/input16 IPVS: ftp: loaded support on port[0] = 21 audit: type=1804 audit(1647217947.979:477): pid=7619 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.5" name="/root/syzkaller-testdir1795645821/syzkaller.pprCxT/433/file0" dev="sda1" ino=14994 res=1 IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready print_req_error: I/O error, dev loop7, sector 256 GRED: Unable to relocate VQ 0x0 after dequeue, screwing up backlog MINIX-fs: mounting unchecked file system, running fsck is recommended chnl_net:chnl_net_open(): err: Unable to register and open device, Err:-19 caif:caif_disconnect_client(): nothing to disconnect chnl_net:chnl_flowctrl_cb(): NET flowctrl func called flow: CLOSE/DEINIT chnl_net:chnl_net_open(): state disconnected A link change request failed with some changes committed already. Interface caif0 may have been left with an inconsistent configuration, please check. audit: type=1800 audit(1647217948.809:478): pid=7755 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.5" name="file0" dev="sda1" ino=13967 res=0 audit: type=1804 audit(1647217948.809:479): pid=7755 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.5" name="/root/syzkaller-testdir1795645821/syzkaller.pprCxT/434/file0" dev="sda1" ino=13967 res=1 audit: type=1804 audit(1647217948.879:480): pid=7755 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.5" name="/root/syzkaller-testdir1795645821/syzkaller.pprCxT/434/file0" dev="sda1" ino=13967 res=1 IPVS: ftp: loaded support on port[0] = 21 MINIX-fs: mounting unchecked file system, running fsck is recommended IPv6: ADDRCONF(NETDEV_CHANGE): Y­4`Ō˜: link becomes ready GRED: Unable to relocate VQ 0x0 after dequeue, screwing up backlog IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready ceph: No mds server is up or the cluster is laggy GRED: Unable to relocate VQ 0x0 after dequeue, screwing up backlog chnl_net:chnl_net_open(): err: Unable to register and open device, Err:-19 caif:caif_disconnect_client(): nothing to disconnect chnl_net:chnl_flowctrl_cb(): NET flowctrl func called flow: CLOSE/DEINIT chnl_net:chnl_net_open(): state disconnected A link change request failed with some changes committed already. Interface caif0 may have been left with an inconsistent configuration, please check. libceph: connect [d::]:6789 error -101 libceph: mon0 [d::]:6789 connect error syz-executor.3 (7856): drop_caches: 4 GRED: Unable to relocate VQ 0x0 after dequeue, screwing up backlog snd_aloop snd_aloop.0: control 6:6:257:syz1:6 is already present libceph: connect [d::]:6789 error -101 libceph: mon0 [d::]:6789 connect error ceph: No mds server is up or the cluster is laggy snd_aloop snd_aloop.0: control 6:6:257:syz1:6 is already present ceph: No mds server is up or the cluster is laggy libceph: connect [d::]:6789 error -101 libceph: mon0 [d::]:6789 connect error audit: type=1800 audit(1647217950.129:481): pid=7977 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed comm="syz-executor.0" name="SYSV00000000" dev="hugetlbfs" ino=2621519 res=0 audit: type=1800 audit(1647217950.169:482): pid=7977 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed comm="syz-executor.0" name="SYSV00000000" dev="hugetlbfs" ino=2687057 res=0 ceph: No mds server is up or the cluster is laggy libceph: connect [d::]:6789 error -101 libceph: mon0 [d::]:6789 connect error audit: type=1800 audit(1647217950.839:483): pid=8029 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed comm="syz-executor.0" name="SYSV00000000" dev="hugetlbfs" ino=2752595 res=0 audit: type=1800 audit(1647217950.889:484): pid=8034 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed comm="syz-executor.0" name="SYSV00000000" dev="hugetlbfs" ino=2916440 res=0 audit: type=1800 audit(1647217951.009:485): pid=8087 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed comm="syz-executor.0" name="SYSV00000000" dev="hugetlbfs" ino=4980887 res=0 audit: type=1800 audit(1647217951.039:486): pid=8087 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed comm="syz-executor.0" name="SYSV00000000" dev="hugetlbfs" ino=5046425 res=0 ceph: No mds server is up or the cluster is laggy GRED: Unable to relocate VQ 0x0 after dequeue, screwing up backlog ISO 9660 Extensions: Microsoft Joliet Level 0 FAT-fs (loop5): Unrecognized mount option "uni_xlate=ƒÜƒDą&†0" or missing value ISO 9660 Extensions: Microsoft Joliet Level 0 netlink: 'syz-executor.5': attribute type 6 has an invalid length. IPVS: ftp: loaded support on port[0] = 21 FAT-fs (loop5): Unrecognized mount option "uni_xlate=ƒÜƒDą&†0" or missing value EXT4-fs (loop3): mounted filesystem without journal. Opts: ,errors=continue netlink: 'syz-executor.5': attribute type 6 has an invalid length. EXT4-fs (loop3): Unrecognized mount option "Ĩ´ŋ=off" or missing value netlink: 'syz-executor.5': attribute type 6 has an invalid length. FAT-fs (loop5): Unrecognized mount option "uni_xlate=ƒÜƒDą&†0" or missing value EXT4-fs (loop3): mounted filesystem without journal. Opts: ,errors=continue EXT4-fs (loop3): Unrecognized mount option "Ĩ´ŋ=off" or missing value IPVS: ftp: loaded support on port[0] = 21 ISO 9660 Extensions: Microsoft Joliet Level 0 GRED: Unable to relocate VQ 0x0 after dequeue, screwing up backlog IPVS: ftp: loaded support on port[0] = 21 EXT4-fs (loop3): VFS: Can't find ext4 filesystem IPVS: ftp: loaded support on port[0] = 21 device vxlan0 entered promiscuous mode IPVS: ftp: loaded support on port[0] = 21 device team_slave_0 entered promiscuous mode device team_slave_1 entered promiscuous mode device macvlan5 entered promiscuous mode device team0 entered promiscuous mode 8021q: adding VLAN 0 to HW filter on device macvlan5 IPVS: ftp: loaded support on port[0] = 21 device vxlan0 entered promiscuous mode IPVS: ftp: loaded support on port[0] = 21