====================================================== WARNING: possible circular locking dependency detected 4.14.232-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.5/27291 is trying to acquire lock: (&xt[i].mutex){+.+.}, at: [] match_revfn+0x43/0x210 net/netfilter/x_tables.c:332 but task is already holding lock: (&table[i].mutex){+.+.}, at: [] nfnl_lock net/netfilter/nfnetlink.c:61 [inline] (&table[i].mutex){+.+.}, at: [] nfnetlink_rcv_msg+0x726/0xc00 net/netfilter/nfnetlink.c:209 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (&table[i].mutex){+.+.}: __mutex_lock_common kernel/locking/mutex.c:756 [inline] __mutex_lock+0xc4/0x1310 kernel/locking/mutex.c:893 nf_tables_netdev_event+0x10d/0x4d0 net/netfilter/nf_tables_netdev.c:122 notifier_call_chain+0x108/0x1a0 kernel/notifier.c:93 call_netdevice_notifiers_info net/core/dev.c:1667 [inline] call_netdevice_notifiers net/core/dev.c:1683 [inline] rollback_registered_many+0x765/0xba0 net/core/dev.c:7203 rollback_registered+0xca/0x170 net/core/dev.c:7245 unregister_netdevice_queue+0x1b4/0x360 net/core/dev.c:8266 unregister_netdevice include/linux/netdevice.h:2443 [inline] ppp_release+0x177/0x1a0 drivers/net/ppp/ppp_generic.c:408 __fput+0x25f/0x7a0 fs/file_table.c:210 task_work_run+0x11f/0x190 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:191 [inline] exit_to_usermode_loop+0x1ad/0x200 arch/x86/entry/common.c:164 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline] syscall_return_slowpath arch/x86/entry/common.c:270 [inline] do_syscall_64+0x4a3/0x640 arch/x86/entry/common.c:297 entry_SYSCALL_64_after_hwframe+0x46/0xbb -> #1 (rtnl_mutex){+.+.}: __mutex_lock_common kernel/locking/mutex.c:756 [inline] __mutex_lock+0xc4/0x1310 kernel/locking/mutex.c:893 unregister_netdevice_notifier+0x5e/0x2b0 net/core/dev.c:1630 tee_tg_destroy+0x5c/0xb0 net/netfilter/xt_TEE.c:123 cleanup_entry+0x232/0x310 net/ipv6/netfilter/ip6_tables.c:684 __do_replace+0x38d/0x580 net/ipv6/netfilter/ip6_tables.c:1105 do_replace net/ipv6/netfilter/ip6_tables.c:1161 [inline] do_ip6t_set_ctl+0x256/0x3b0 net/ipv6/netfilter/ip6_tables.c:1687 nf_sockopt net/netfilter/nf_sockopt.c:106 [inline] nf_setsockopt+0x5f/0xb0 net/netfilter/nf_sockopt.c:115 ipv6_setsockopt+0xc0/0x120 net/ipv6/ipv6_sockglue.c:937 tcp_setsockopt+0x7b/0xc0 net/ipv4/tcp.c:2828 SYSC_setsockopt net/socket.c:1865 [inline] SyS_setsockopt+0x110/0x1e0 net/socket.c:1844 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb -> #0 (&xt[i].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 match_revfn+0x43/0x210 net/netfilter/x_tables.c:332 xt_find_revision+0x8d/0x1d0 net/netfilter/x_tables.c:380 nfnl_compat_get+0x1f7/0x870 net/netfilter/nft_compat.c:678 nfnetlink_rcv_msg+0x9bb/0xc00 net/netfilter/nfnetlink.c:214 netlink_rcv_skb+0x125/0x390 net/netlink/af_netlink.c:2433 nfnetlink_rcv+0x1ab/0x1da0 net/netfilter/nfnetlink.c:515 netlink_unicast_kernel net/netlink/af_netlink.c:1287 [inline] netlink_unicast+0x437/0x610 net/netlink/af_netlink.c:1313 netlink_sendmsg+0x62e/0xb80 net/netlink/af_netlink.c:1878 sock_sendmsg_nosec net/socket.c:646 [inline] sock_sendmsg+0xb5/0x100 net/socket.c:656 ___sys_sendmsg+0x6c8/0x800 net/socket.c:2062 __sys_sendmsg+0xa3/0x120 net/socket.c:2096 SYSC_sendmsg net/socket.c:2107 [inline] SyS_sendmsg+0x27/0x40 net/socket.c:2103 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: &xt[i].mutex --> rtnl_mutex --> &table[i].mutex Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&table[i].mutex); lock(rtnl_mutex); lock(&table[i].mutex); lock(&xt[i].mutex); *** DEADLOCK *** 1 lock held by syz-executor.5/27291: #0: (&table[i].mutex){+.+.}, at: [] nfnl_lock net/netfilter/nfnetlink.c:61 [inline] #0: (&table[i].mutex){+.+.}, at: [] nfnetlink_rcv_msg+0x726/0xc00 net/netfilter/nfnetlink.c:209 stack backtrace: CPU: 0 PID: 27291 Comm: syz-executor.5 Not tainted 4.14.232-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 match_revfn+0x43/0x210 net/netfilter/x_tables.c:332 xt_find_revision+0x8d/0x1d0 net/netfilter/x_tables.c:380 nfnl_compat_get+0x1f7/0x870 net/netfilter/nft_compat.c:678 nfnetlink_rcv_msg+0x9bb/0xc00 net/netfilter/nfnetlink.c:214 netlink_rcv_skb+0x125/0x390 net/netlink/af_netlink.c:2433 nfnetlink_rcv+0x1ab/0x1da0 net/netfilter/nfnetlink.c:515 netlink_unicast_kernel net/netlink/af_netlink.c:1287 [inline] netlink_unicast+0x437/0x610 net/netlink/af_netlink.c:1313 netlink_sendmsg+0x62e/0xb80 net/netlink/af_netlink.c:1878 sock_sendmsg_nosec net/socket.c:646 [inline] sock_sendmsg+0xb5/0x100 net/socket.c:656 ___sys_sendmsg+0x6c8/0x800 net/socket.c:2062 __sys_sendmsg+0xa3/0x120 net/socket.c:2096 SYSC_sendmsg net/socket.c:2107 [inline] SyS_sendmsg+0x27/0x40 net/socket.c:2103 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x4665d9 RSP: 002b:00007f6baa902188 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 00000000004665d9 RDX: 0000000020000000 RSI: 0000000020000100 RDI: 0000000000000003 RBP: 00000000004bfcb9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60 R13: 00007ffff41a039f R14: 00007f6baa902300 R15: 0000000000022000 IPVS: ftp: loaded support on port[0] = 21 audit: type=1800 audit(1620864969.931:20901): pid=27316 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed" comm="syz-executor.5" name="file0" dev="sda1" ino=14959 res=0 netlink: 16 bytes leftover after parsing attributes in process `syz-executor.5'. EXT4-fs (loop4): Unrecognized mount option "ƥ" or missing value hub 9-0:1.0: USB hub found hub 9-0:1.0: 8 ports detected audit: type=1804 audit(1620864971.431:20902): pid=27464 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.5" name="/root/syzkaller-testdir108292486/syzkaller.7SVExc/633/file0" dev="sda1" ino=14963 res=1 print_req_error: I/O error, dev loop4, sector 0 EXT4-fs (loop4): unsupported descriptor size 69 IPVS: ftp: loaded support on port[0] = 21 EXT4-fs (loop4): unsupported descriptor size 69 IPVS: ftp: loaded support on port[0] = 21 audit: type=1804 audit(1620864972.311:20903): pid=27561 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.4" name="/root/syzkaller-testdir941141018/syzkaller.PBqdT5/647/file0" dev="sda1" ino=14965 res=1 netlink: 4 bytes leftover after parsing attributes in process `syz-executor.3'. EXT4-fs (loop4): Unrecognized mount option "s)yu`'7I" or missing value ADFS-fs: unrecognised mount option "\*-:" or missing value audit: type=1804 audit(1620864972.611:20904): pid=27578 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="ToMToU" comm="syz-executor.5" name="/root/syzkaller-testdir108292486/syzkaller.7SVExc/633/file0" dev="sda1" ino=14963 res=1 audit: type=1804 audit(1620864972.731:20905): pid=27471 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.5" name="/root/syzkaller-testdir108292486/syzkaller.7SVExc/633/file0" dev="sda1" ino=14963 res=1 netlink: 4 bytes leftover after parsing attributes in process `syz-executor.3'. netlink: 4 bytes leftover after parsing attributes in process `syz-executor.5'. netlink: 12 bytes leftover after parsing attributes in process `syz-executor.5'. netlink: 4 bytes leftover after parsing attributes in process `syz-executor.5'. netlink: 12 bytes leftover after parsing attributes in process `syz-executor.5'. audit: type=1804 audit(1620864973.431:20906): pid=27621 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.3" name="/root/syzkaller-testdir240181416/syzkaller.bV8NOh/545/file0" dev="sda1" ino=14971 res=1 audit: type=1804 audit(1620864973.471:20907): pid=27563 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="ToMToU" comm="syz-executor.4" name="/root/syzkaller-testdir941141018/syzkaller.PBqdT5/647/file0" dev="sda1" ino=14965 res=1 audit: type=1804 audit(1620864973.471:20908): pid=27620 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.4" name="/root/syzkaller-testdir941141018/syzkaller.PBqdT5/647/file0" dev="sda1" ino=14965 res=1 IPVS: ftp: loaded support on port[0] = 21 EXT4-fs (loop4): unsupported descriptor size 69 EXT4-fs (loop4): unsupported descriptor size 69 audit: type=1804 audit(1620864973.991:20909): pid=27631 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.3" name="/root/syzkaller-testdir240181416/syzkaller.bV8NOh/545/file0" dev="sda1" ino=14971 res=1 audit: type=1804 audit(1620864974.071:20910): pid=27694 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.5" name="/root/syzkaller-testdir108292486/syzkaller.7SVExc/640/file0" dev="sda1" ino=14976 res=1 EXT4-fs (loop4): Unrecognized mount option "}q~S|:ރEamL^xFgsi?kY䃷?э:-" or missing value print_req_error: I/O error, dev loop5, sector 0 EXT4-fs (loop5): Unrecognized mount option "s)yu`'7I" or missing value EXT4-fs (loop4): Unrecognized mount option "}q~S|:ރEamL^xFgsi?kY䃷?э:-" or missing value EXT4-fs (loop4): unsupported descriptor size 69 EXT4-fs (loop4): unsupported descriptor size 69 print_req_error: I/O error, dev loop4, sector 0 Buffer I/O error on dev loop4, logical block 0, async page read EXT4-fs (loop1): unsupported descriptor size 69 EXT4-fs (loop4): unsupported inode size: 41519 EXT4-fs (loop1): unsupported descriptor size 69 EXT4-fs (loop4): blocksize: 1024 FAT-fs (loop4): Unrecognized mount option "subj_type=[\" or missing value EXT4-fs (loop1): unsupported descriptor size 69 EXT4-fs (loop4): Unrecognized mount option "dGb" or missing value EXT4-fs (loop4): Unrecognized mount option "dGb" or missing value print_req_error: I/O error, dev loop4, sector 0 Buffer I/O error on dev loop4, logical block 0, async page read EXT4-fs (loop4): unsupported descriptor size 69 EXT4-fs (loop4): VFS: Can't find ext4 filesystem netlink: 4 bytes leftover after parsing attributes in process `syz-executor.1'. IPVS: ftp: loaded support on port[0] = 21 netlink: 4 bytes leftover after parsing attributes in process `syz-executor.5'. EXT4-fs (loop4): unsupported descriptor size 69 print_req_error: I/O error, dev loop4, sector 0 Buffer I/O error on dev loop4, logical block 0, async page read EXT4-fs (loop4): Unrecognized mount option "A" or missing value overlayfs: unrecognized mount option "lxowerdi" or missing value EXT4-fs (loop4): VFS: Can't find ext4 filesystem EXT4-fs (loop4): VFS: Can't find ext4 filesystem EXT4-fs (loop4): unsupported descriptor size 69 overlayfs: unrecognized mount option "18446744073709551615" or missing value netlink: 4 bytes leftover after parsing attributes in process `syz-executor.5'. EXT4-fs (loop4): couldn't mount as ext3 due to feature incompatibilities overlayfs: at least 2 lowerdir are needed while upperdir nonexistent overlayfs: at least 2 lowerdir are needed while upperdir nonexistent IPVS: ftp: loaded support on port[0] = 21 EXT4-fs (loop4): couldn't mount as ext3 due to feature incompatibilities netlink: 4 bytes leftover after parsing attributes in process `syz-executor.1'. overlayfs: at least 2 lowerdir are needed while upperdir nonexistent EXT4-fs (loop4): unsupported descriptor size 69 overlayfs: unrecognized mount option "18446744073709551615 b<;Ag+zSu_<:wUkv" or missing value EXT4-fs (loop4): unsupported descriptor size 69 print_req_error: I/O error, dev loop4, sector 0 Buffer I/O error on dev loop4, logical block 0, async page read overlayfs: at least 2 lowerdir are needed while upperdir nonexistent overlayfs: at least 2 lowerdir are needed while upperdir nonexistent EXT4-fs (loop4): unsupported descriptor size 69 overlayfs: at least 2 lowerdir are needed while upperdir nonexistent overlayfs: at least 2 lowerdir are needed while upperdir nonexistent EXT4-fs (loop4): unsupported descriptor size 69 EXT4-fs (loop4): unsupported descriptor size 69 print_req_error: I/O error, dev loop4, sector 0 Buffer I/O error on dev loop4, logical block 0, async page read netlink: 4 bytes leftover after parsing attributes in process `syz-executor.5'. overlayfs: at least 2 lowerdir are needed while upperdir nonexistent EXT4-fs (loop4): unsupported descriptor size 69 overlayfs: at least 2 lowerdir are needed while upperdir nonexistent netlink: 4 bytes leftover after parsing attributes in process `syz-executor.1'. REISERFS warning (device loop4): super-6502 reiserfs_getopt: unknown mount option "smackfshat=ext4" overlayfs: at least 2 lowerdir are needed while upperdir nonexistent EXT4-fs (loop4): unsupported descriptor size 69 print_req_error: I/O error, dev loop4, sector 0 IPVS: ftp: loaded support on port[0] = 21