print_req_error: I/O error, dev loop3, sector 0
EXT4-fs (loop3): VFS: Can't find ext4 filesystem
======================================================
WARNING: possible circular locking dependency detected
4.14.176-syzkaller #0 Not tainted
------------------------------------------------------
syz-executor.2/10929 is trying to acquire lock:
input: syz1 as /devices/virtual/input/input688
(dev->qdisc_tx_busylock ?: &qdisc_tx_busylock){+...}, at: [<ffffffff84ff20ab>] spin_lock include/linux/spinlock.h:317 [inline]
(dev->qdisc_tx_busylock ?: &qdisc_tx_busylock){+...}, at: [<ffffffff84ff20ab>] __dev_xmit_skb net/core/dev.c:3202 [inline]
(dev->qdisc_tx_busylock ?: &qdisc_tx_busylock){+...}, at: [<ffffffff84ff20ab>] __dev_queue_xmit+0x1f0b/0x25c0 net/core/dev.c:3493
but task is already holding lock:
(_xmit_ETHER#2){+.-.}, at: [<ffffffff850c95f4>] spin_lock include/linux/spinlock.h:317 [inline]
(_xmit_ETHER#2){+.-.}, at: [<ffffffff850c95f4>] __netif_tx_lock include/linux/netdevice.h:3536 [inline]
(_xmit_ETHER#2){+.-.}, at: [<ffffffff850c95f4>] sch_direct_xmit+0x1e4/0x510 net/sched/sch_generic.c:184
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #1 (_xmit_ETHER#2){+.-.}:
__raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
_raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:152
spin_lock include/linux/spinlock.h:317 [inline]
__netif_tx_lock include/linux/netdevice.h:3536 [inline]
sch_direct_xmit+0x1e4/0x510 net/sched/sch_generic.c:184
__dev_xmit_skb net/core/dev.c:3218 [inline]
__dev_queue_xmit+0x1b6e/0x25c0 net/core/dev.c:3493
neigh_hh_output include/net/neighbour.h:490 [inline]
neigh_output include/net/neighbour.h:498 [inline]
ip_finish_output2+0xde8/0x14a0 net/ipv4/ip_output.c:229
ip_finish_output+0x556/0xc30 net/ipv4/ip_output.c:317
NF_HOOK_COND include/linux/netfilter.h:239 [inline]
ip_output+0x1c2/0x520 net/ipv4/ip_output.c:405
dst_output include/net/dst.h:462 [inline]
ip_local_out+0x93/0x170 net/ipv4/ip_output.c:124
ip_send_skb+0x3a/0xc0 net/ipv4/ip_output.c:1422
udp_send_skb+0x614/0xbd0 net/ipv4/udp.c:833
udp_sendmsg+0x1562/0x1b70 net/ipv4/udp.c:1057
inet_sendmsg+0x116/0x4d0 net/ipv4/af_inet.c:762
sock_sendmsg_nosec net/socket.c:646 [inline]
sock_sendmsg+0xc5/0x100 net/socket.c:656
___sys_sendmsg+0x349/0x840 net/socket.c:2062
__sys_sendmmsg+0x129/0x330 net/socket.c:2152
SYSC_sendmmsg net/socket.c:2183 [inline]
SyS_sendmmsg+0x2f/0x50 net/socket.c:2178
do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x42/0xb7
-> #0 (dev->qdisc_tx_busylock ?: &qdisc_tx_busylock){+...}:
lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3994
__raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
_raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:152
spin_lock include/linux/spinlock.h:317 [inline]
__dev_xmit_skb net/core/dev.c:3202 [inline]
__dev_queue_xmit+0x1f0b/0x25c0 net/core/dev.c:3493
neigh_hh_output include/net/neighbour.h:490 [inline]
neigh_output include/net/neighbour.h:498 [inline]
ip_finish_output2+0xde8/0x14a0 net/ipv4/ip_output.c:229
ip_finish_output+0x556/0xc30 net/ipv4/ip_output.c:317
NF_HOOK_COND include/linux/netfilter.h:239 [inline]
ip_output+0x1c2/0x520 net/ipv4/ip_output.c:405
dst_output include/net/dst.h:462 [inline]
ip_local_out+0x93/0x170 net/ipv4/ip_output.c:124
iptunnel_xmit+0x583/0x970 net/ipv4/ip_tunnel_core.c:91
ip_tunnel_xmit+0xf67/0x32d8 net/ipv4/ip_tunnel.c:797
erspan_xmit net/ipv4/ip_gre.c:750 [inline]
erspan_xmit+0x40f/0x1050 net/ipv4/ip_gre.c:725
__netdev_start_xmit include/linux/netdevice.h:4039 [inline]
netdev_start_xmit include/linux/netdevice.h:4048 [inline]
xmit_one net/core/dev.c:3009 [inline]
dev_hard_start_xmit+0x186/0x890 net/core/dev.c:3025
sch_direct_xmit+0x25f/0x510 net/sched/sch_generic.c:186
__dev_xmit_skb net/core/dev.c:3218 [inline]
__dev_queue_xmit+0x1b6e/0x25c0 net/core/dev.c:3493
neigh_hh_output include/net/neighbour.h:490 [inline]
neigh_output include/net/neighbour.h:498 [inline]
ip_finish_output2+0xde8/0x14a0 net/ipv4/ip_output.c:229
ip_finish_output+0x556/0xc30 net/ipv4/ip_output.c:317
NF_HOOK_COND include/linux/netfilter.h:239 [inline]
ip_output+0x1c2/0x520 net/ipv4/ip_output.c:405
dst_output include/net/dst.h:462 [inline]
ip_local_out+0x93/0x170 net/ipv4/ip_output.c:124
ip_send_skb+0x3a/0xc0 net/ipv4/ip_output.c:1422
udp_send_skb+0x614/0xbd0 net/ipv4/udp.c:833
udp_sendmsg+0x1562/0x1b70 net/ipv4/udp.c:1057
inet_sendmsg+0x116/0x4d0 net/ipv4/af_inet.c:762
sock_sendmsg_nosec net/socket.c:646 [inline]
sock_sendmsg+0xc5/0x100 net/socket.c:656
___sys_sendmsg+0x349/0x840 net/socket.c:2062
__sys_sendmmsg+0x129/0x330 net/socket.c:2152
SYSC_sendmmsg net/socket.c:2183 [inline]
SyS_sendmmsg+0x2f/0x50 net/socket.c:2178
do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x42/0xb7
other info that might help us debug this:
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(_xmit_ETHER#2);
lock(dev->qdisc_tx_busylock ?: &qdisc_tx_busylock);
lock(_xmit_ETHER#2);
lock(dev->qdisc_tx_busylock ?: &qdisc_tx_busylock);
*** DEADLOCK ***
6 locks held by syz-executor.2/10929:
#0: (rcu_read_lock_bh){....}, at: [<ffffffff8548db16>] lwtunnel_xmit_redirect include/net/lwtunnel.h:92 [inline]
#0: (rcu_read_lock_bh){....}, at: [<ffffffff8548db16>] ip_finish_output2+0x256/0x14a0 net/ipv4/ip_output.c:213
#1: (rcu_read_lock_bh){....}, at: [<ffffffff84ff0382>] __dev_queue_xmit+0x1e2/0x25c0 net/core/dev.c:3459
#2: (dev->qdisc_running_key ?: &qdisc_running_key){+...}, at: [<ffffffff8548e6a8>] neigh_hh_output include/net/neighbour.h:490 [inline]
#2: (dev->qdisc_running_key ?: &qdisc_running_key){+...}, at: [<ffffffff8548e6a8>] neigh_output include/net/neighbour.h:498 [inline]
#2: (dev->qdisc_running_key ?: &qdisc_running_key){+...}, at: [<ffffffff8548e6a8>] ip_finish_output2+0xde8/0x14a0 net/ipv4/ip_output.c:229
#3: (_xmit_ETHER#2){+.-.}, at: [<ffffffff850c95f4>] spin_lock include/linux/spinlock.h:317 [inline]
#3: (_xmit_ETHER#2){+.-.}, at: [<ffffffff850c95f4>] __netif_tx_lock include/linux/netdevice.h:3536 [inline]
#3: (_xmit_ETHER#2){+.-.}, at: [<ffffffff850c95f4>] sch_direct_xmit+0x1e4/0x510 net/sched/sch_generic.c:184
#4: (rcu_read_lock_bh){....}, at: [<ffffffff8548db16>] lwtunnel_xmit_redirect include/net/lwtunnel.h:92 [inline]
#4: (rcu_read_lock_bh){....}, at: [<ffffffff8548db16>] ip_finish_output2+0x256/0x14a0 net/ipv4/ip_output.c:213
#5: (rcu_read_lock_bh){....}, at: [<ffffffff84ff0382>] __dev_queue_xmit+0x1e2/0x25c0 net/core/dev.c:3459
stack backtrace:
CPU: 1 PID: 10929 Comm: syz-executor.2 Not tainted 4.14.176-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+0x13e/0x194 lib/dump_stack.c:58
print_circular_bug.isra.0.cold+0x1c4/0x282 kernel/locking/lockdep.c:1258
check_prev_add kernel/locking/lockdep.c:1901 [inline]
check_prevs_add kernel/locking/lockdep.c:2018 [inline]
validate_chain kernel/locking/lockdep.c:2460 [inline]
__lock_acquire+0x2cb3/0x4620 kernel/locking/lockdep.c:3487
lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3994
__raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
_raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:152
spin_lock include/linux/spinlock.h:317 [inline]
__dev_xmit_skb net/core/dev.c:3202 [inline]
__dev_queue_xmit+0x1f0b/0x25c0 net/core/dev.c:3493
neigh_hh_output include/net/neighbour.h:490 [inline]
neigh_output include/net/neighbour.h:498 [inline]
ip_finish_output2+0xde8/0x14a0 net/ipv4/ip_output.c:229
ip_finish_output+0x556/0xc30 net/ipv4/ip_output.c:317
NF_HOOK_COND include/linux/netfilter.h:239 [inline]
ip_output+0x1c2/0x520 net/ipv4/ip_output.c:405
dst_output include/net/dst.h:462 [inline]
ip_local_out+0x93/0x170 net/ipv4/ip_output.c:124
iptunnel_xmit+0x583/0x970 net/ipv4/ip_tunnel_core.c:91
ip_tunnel_xmit+0xf67/0x32d8 net/ipv4/ip_tunnel.c:797
erspan_xmit net/ipv4/ip_gre.c:750 [inline]
erspan_xmit+0x40f/0x1050 net/ipv4/ip_gre.c:725
__netdev_start_xmit include/linux/netdevice.h:4039 [inline]
netdev_start_xmit include/linux/netdevice.h:4048 [inline]
xmit_one net/core/dev.c:3009 [inline]
dev_hard_start_xmit+0x186/0x890 net/core/dev.c:3025
sch_direct_xmit+0x25f/0x510 net/sched/sch_generic.c:186
__dev_xmit_skb net/core/dev.c:3218 [inline]
__dev_queue_xmit+0x1b6e/0x25c0 net/core/dev.c:3493
neigh_hh_output include/net/neighbour.h:490 [inline]
neigh_output include/net/neighbour.h:498 [inline]
ip_finish_output2+0xde8/0x14a0 net/ipv4/ip_output.c:229
ip_finish_output+0x556/0xc30 net/ipv4/ip_output.c:317
NF_HOOK_COND include/linux/netfilter.h:239 [inline]
ip_output+0x1c2/0x520 net/ipv4/ip_output.c:405
dst_output include/net/dst.h:462 [inline]
ip_local_out+0x93/0x170 net/ipv4/ip_output.c:124
ip_send_skb+0x3a/0xc0 net/ipv4/ip_output.c:1422
udp_send_skb+0x614/0xbd0 net/ipv4/udp.c:833
udp_sendmsg+0x1562/0x1b70 net/ipv4/udp.c:1057
inet_sendmsg+0x116/0x4d0 net/ipv4/af_inet.c:762
sock_sendmsg_nosec net/socket.c:646 [inline]
sock_sendmsg+0xc5/0x100 net/socket.c:656
___sys_sendmsg+0x349/0x840 net/socket.c:2062
__sys_sendmmsg+0x129/0x330 net/socket.c:2152
SYSC_sendmmsg net/socket.c:2183 [inline]
SyS_sendmmsg+0x2f/0x50 net/socket.c:2178
do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x45c829
RSP: 002b:00007f4bc0bc2c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 00000000004fc080 RCX: 000000000045c829
RDX: 0400000000000075 RSI: 0000000020007fc0 RDI: 0000000000000003
RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000000008d7 R14: 00000000004cb7aa R15: 00007f4bc0bc36d4
input: syz1 as /devices/virtual/input/input689
input: syz1 as /devices/virtual/input/input692
input: syz1 as /devices/virtual/input/input693
EXT4-fs (loop3): Invalid want_extra_isize 0
input: syz1 as /devices/virtual/input/input694
print_req_error: I/O error, dev loop3, sector 0
Buffer I/O error on dev loop3, logical block 0, async page read
EXT4-fs (loop3): Invalid want_extra_isize 0
input: syz1 as /devices/virtual/input/input695
EXT4-fs (loop3): Invalid want_extra_isize 0
input: syz1 as /devices/virtual/input/input696
EXT4-fs (loop3): Invalid want_extra_isize 0
input: syz1 as /devices/virtual/input/input697
EXT4-fs (loop3): VFS: Can't find ext4 filesystem
EXT4-fs (loop3): VFS: Can't find ext4 filesystem
input: syz1 as /devices/virtual/input/input698
EXT4-fs (loop3): Invalid want_extra_isize 0
EXT4-fs (loop3): Invalid want_extra_isize 0
EXT4-fs (loop3): Unrecognized mount option "debug_want_extra_isize=0x000000000E�00000" or missing value
EXT4-fs (loop3): Unrecognized mount option "debug_want_extra_isize=0x000000000E�00000" or missing value
print_req_error: I/O error, dev loop3, sector 0
Buffer I/O error on dev loop3, logical block 0, async page read
IPVS: ftp: loaded support on port[0] = 21
EXT4-fs (loop3): Invalid want_extra_isize 0
EXT4-fs (loop3): Invalid want_extra_isize 0
input: syz1 as /devices/virtual/input/input699
audit: type=1400 audit(1587507640.092:206): avc: denied { net_raw } for pid=11210 comm="syz-executor.2" capability=13 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=cap_userns permissive=1
EXT4-fs (loop3): Invalid want_extra_isize 0
EXT4-fs (loop3): Invalid want_extra_isize 0
input: syz1 as /devices/virtual/input/input700
input: syz1 as /devices/virtual/input/input701
input: syz1 as /devices/virtual/input/input702
ptrace attach of "/root/syz-executor.0"[11278] was attempted by "/root/syz-executor.0"[11279]
EXT4-fs (loop3): Invalid want_extra_isize 0
input: syz1 as /devices/virtual/input/input703
input: syz1 as /devices/virtual/input/input704
input: syz1 as /devices/virtual/input/input705
EXT4-fs (loop3): Invalid want_extra_isize 0
EXT4-fs (loop3): Invalid want_extra_isize 0
input: syz1 as /devices/virtual/input/input706
print_req_error: I/O error, dev loop3, sector 0
Buffer I/O error on dev loop3, logical block 0, async page read
input: syz1 as /devices/virtual/input/input707
input: syz1 as /devices/virtual/input/input708