============================================ WARNING: possible recursive locking detected 4.19.159-syzkaller #0 Not tainted -------------------------------------------- syz-executor.0/17870 is trying to acquire lock: 000000005f653c37 (_xmit_ETHER#2){+.-.}, at: spin_lock include/linux/spinlock.h:329 [inline] 000000005f653c37 (_xmit_ETHER#2){+.-.}, at: __netif_tx_lock include/linux/netdevice.h:3828 [inline] 000000005f653c37 (_xmit_ETHER#2){+.-.}, at: __dev_queue_xmit+0x2592/0x2e00 net/core/dev.c:3834 but task is already holding lock: 00000000a61678da (_xmit_ETHER#2){+.-.}, at: spin_lock include/linux/spinlock.h:329 [inline] 00000000a61678da (_xmit_ETHER#2){+.-.}, at: __netif_tx_lock include/linux/netdevice.h:3828 [inline] 00000000a61678da (_xmit_ETHER#2){+.-.}, at: sch_direct_xmit+0x254/0xf50 net/sched/sch_generic.c:330 other info that might help us debug this: EXT4-fs error (device loop5): ext4_fill_super:4448: inode #2: comm syz-executor.5: iget: root inode unallocated Possible unsafe locking scenario: CPU0 ---- lock(_xmit_ETHER#2); lock(_xmit_ETHER#2); *** DEADLOCK *** May be due to missing lock nesting notation 7 locks held by syz-executor.0/17870: #0: 00000000f85e8075 (rcu_read_lock_bh){....}, at: lwtunnel_xmit_redirect include/net/lwtunnel.h:92 [inline] #0: 00000000f85e8075 (rcu_read_lock_bh){....}, at: ip_finish_output2+0x28d/0x15a0 net/ipv4/ip_output.c:214 EXT4-fs (loop5): get root inode failed #1: 00000000f85e8075 (rcu_read_lock_bh){....}, at: __dev_queue_xmit+0x1e2/0x2e00 net/core/dev.c:3773 #2: 0000000037503672 (&(&sch->seqlock)->rlock){+...}, at: spin_trylock include/linux/spinlock.h:339 [inline] #2: 0000000037503672 (&(&sch->seqlock)->rlock){+...}, at: qdisc_run_begin include/net/sch_generic.h:130 [inline] #2: 0000000037503672 (&(&sch->seqlock)->rlock){+...}, at: qdisc_run include/net/pkt_sched.h:119 [inline] #2: 0000000037503672 (&(&sch->seqlock)->rlock){+...}, at: __dev_xmit_skb net/core/dev.c:3451 [inline] #2: 0000000037503672 (&(&sch->seqlock)->rlock){+...}, at: __dev_queue_xmit+0x278b/0x2e00 net/core/dev.c:3807 #3: 000000002cacd68b (dev->qdisc_running_key ?: &qdisc_running_key){+...}, at: neigh_hh_output include/net/neighbour.h:491 [inline] #3: 000000002cacd68b (dev->qdisc_running_key ?: &qdisc_running_key){+...}, at: neigh_output include/net/neighbour.h:499 [inline] #3: 000000002cacd68b (dev->qdisc_running_key ?: &qdisc_running_key){+...}, at: ip_finish_output2+0xb6d/0x15a0 net/ipv4/ip_output.c:230 #4: 00000000a61678da (_xmit_ETHER#2){+.-.}, at: spin_lock include/linux/spinlock.h:329 [inline] #4: 00000000a61678da (_xmit_ETHER#2){+.-.}, at: __netif_tx_lock include/linux/netdevice.h:3828 [inline] #4: 00000000a61678da (_xmit_ETHER#2){+.-.}, at: sch_direct_xmit+0x254/0xf50 net/sched/sch_generic.c:330 EXT4-fs (loop5): mount failed #5: 00000000f85e8075 (rcu_read_lock_bh){....}, at: lwtunnel_xmit_redirect include/net/lwtunnel.h:92 [inline] #5: 00000000f85e8075 (rcu_read_lock_bh){....}, at: ip_finish_output2+0x28d/0x15a0 net/ipv4/ip_output.c:214 #6: 00000000f85e8075 (rcu_read_lock_bh){....}, at: __dev_queue_xmit+0x1e2/0x2e00 net/core/dev.c:3773 stack backtrace: CPU: 0 PID: 17870 Comm: syz-executor.0 Not tainted 4.19.159-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/0x2fe lib/dump_stack.c:118 print_deadlock_bug kernel/locking/lockdep.c:1763 [inline] check_deadlock kernel/locking/lockdep.c:1807 [inline] validate_chain kernel/locking/lockdep.c:2403 [inline] __lock_acquire.cold+0x121/0x57e kernel/locking/lockdep.c:3415 lock_acquire+0x170/0x3c0 kernel/locking/lockdep.c:3907 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:144 spin_lock include/linux/spinlock.h:329 [inline] __netif_tx_lock include/linux/netdevice.h:3828 [inline] __dev_queue_xmit+0x2592/0x2e00 net/core/dev.c:3834 neigh_resolve_output+0x55a/0x910 net/core/neighbour.c:1374 neigh_output include/net/neighbour.h:501 [inline] ip_finish_output2+0xd76/0x15a0 net/ipv4/ip_output.c:230 ip_finish_output+0x85b/0xd20 net/ipv4/ip_output.c:318 NF_HOOK_COND include/linux/netfilter.h:278 [inline] ip_output+0x203/0x5f0 net/ipv4/ip_output.c:406 dst_output include/net/dst.h:455 [inline] ip_local_out+0xaf/0x170 net/ipv4/ip_output.c:125 iptunnel_xmit+0x63b/0x9d0 net/ipv4/ip_tunnel_core.c:91 ip_tunnel_xmit+0x134e/0x37f0 net/ipv4/ip_tunnel.c:783 erspan_xmit+0x1837/0x2790 net/ipv4/ip_gre.c:754 __netdev_start_xmit include/linux/netdevice.h:4333 [inline] netdev_start_xmit include/linux/netdevice.h:4347 [inline] xmit_one net/core/dev.c:3256 [inline] dev_hard_start_xmit+0x1a8/0x920 net/core/dev.c:3272 sch_direct_xmit+0x2d6/0xf50 net/sched/sch_generic.c:332 qdisc_restart net/sched/sch_generic.c:395 [inline] __qdisc_run+0x4d0/0x1640 net/sched/sch_generic.c:403 qdisc_run include/net/pkt_sched.h:120 [inline] __dev_xmit_skb net/core/dev.c:3451 [inline] __dev_queue_xmit+0x2102/0x2e00 net/core/dev.c:3807 neigh_hh_output include/net/neighbour.h:491 [inline] neigh_output include/net/neighbour.h:499 [inline] ip_finish_output2+0xb6d/0x15a0 net/ipv4/ip_output.c:230 ip_finish_output+0x85b/0xd20 net/ipv4/ip_output.c:318 NF_HOOK_COND include/linux/netfilter.h:278 [inline] ip_output+0x203/0x5f0 net/ipv4/ip_output.c:406 dst_output include/net/dst.h:455 [inline] ip_local_out+0xaf/0x170 net/ipv4/ip_output.c:125 ip_send_skb+0x3e/0xe0 net/ipv4/ip_output.c:1447 udp_send_skb+0x6a4/0x1170 net/ipv4/udp.c:848 udp_sendmsg+0x1cb4/0x2550 net/ipv4/udp.c:1135 inet_sendmsg+0x132/0x5a0 net/ipv4/af_inet.c:798 sock_sendmsg_nosec net/socket.c:622 [inline] sock_sendmsg+0xc3/0x120 net/socket.c:632 ___sys_sendmsg+0x3b3/0x8e0 net/socket.c:2115 __sys_sendmmsg+0x195/0x470 net/socket.c:2210 __do_sys_sendmmsg net/socket.c:2239 [inline] __se_sys_sendmmsg net/socket.c:2236 [inline] __x64_sys_sendmmsg+0x99/0x100 net/socket.c:2236 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45deb9 Code: 0d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 db b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fb67638ac78 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 RAX: ffffffffffffffda RBX: 0000000000027f80 RCX: 000000000045deb9 RDX: 0400000000000075 RSI: 0000000020007fc0 RDI: 0000000000000004 RBP: 000000000118bf68 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118bf2c R13: 00007fff78bd657f R14: 00007fb67638b9c0 R15: 000000000118bf2c EXT4-fs (loop3): mounted filesystem without journal. Opts: ,errors=continue EXT4-fs (loop4): mounted filesystem without journal. Opts: ,errors=continue EXT4-fs error (device loop5): ext4_fill_super:4448: inode #2: comm syz-executor.5: iget: root inode unallocated EXT4-fs (loop5): get root inode failed EXT4-fs (loop5): mount failed EXT4-fs (loop3): mounted filesystem without journal. Opts: ,errors=continue EXT4-fs error (device loop5): ext4_fill_super:4448: inode #2: comm syz-executor.5: iget: root inode unallocated EXT4-fs (loop5): get root inode failed EXT4-fs (loop5): mount failed EXT4-fs (loop4): mounted filesystem without journal. Opts: ,errors=continue EXT4-fs error (device loop5): ext4_fill_super:4448: inode #2: comm syz-executor.5: iget: root inode unallocated EXT4-fs (loop5): get root inode failed EXT4-fs (loop3): mounted filesystem without journal. Opts: ,errors=continue EXT4-fs (loop5): mount failed EXT4-fs (loop4): mounted filesystem without journal. Opts: ,errors=continue EXT4-fs error (device loop5): ext4_fill_super:4448: inode #2: comm syz-executor.5: iget: root inode unallocated EXT4-fs (loop5): get root inode failed EXT4-fs (loop5): mount failed EXT4-fs error (device loop3): ext4_fill_super:4448: inode #2: comm syz-executor.3: iget: root inode unallocated EXT4-fs (loop4): mounted filesystem without journal. Opts: ,errors=continue EXT4-fs (loop3): get root inode failed EXT4-fs (loop3): mount failed EXT4-fs error (device loop5): ext4_fill_super:4448: inode #2: comm syz-executor.5: iget: root inode unallocated EXT4-fs (loop5): get root inode failed EXT4-fs (loop5): mount failed EXT4-fs error (device loop3): ext4_fill_super:4448: inode #2: comm syz-executor.3: iget: root inode unallocated EXT4-fs (loop4): mounted filesystem without journal. Opts: ,errors=continue EXT4-fs (loop3): get root inode failed EXT4-fs (loop3): mount failed EXT4-fs error (device loop5): ext4_fill_super:4448: inode #2: comm syz-executor.5: iget: root inode unallocated EXT4-fs (loop5): get root inode failed overlayfs: unrecognized mount option "lowerdir=" or missing value EXT4-fs (loop5): mount failed EXT4-fs error (device loop3): ext4_fill_super:4448: inode #2: comm syz-executor.3: iget: root inode unallocated EXT4-fs (loop3): get root inode failed EXT4-fs (loop5): mounted filesystem without journal. Opts: ,errors=continue EXT4-fs (loop4): mounted filesystem without journal. Opts: ,errors=continue EXT4-fs (loop3): mount failed overlayfs: unrecognized mount option "lowerdir=" or missing value EXT4-fs (loop4): mounted filesystem without journal. Opts: ,errors=continue EXT4-fs error (device loop3): ext4_fill_super:4448: inode #2: comm syz-executor.3: iget: root inode unallocated EXT4-fs (loop5): mounted filesystem without journal. Opts: ,errors=continue EXT4-fs (loop3): get root inode failed EXT4-fs (loop3): mount failed EXT4-fs (loop5): mounted filesystem without journal. Opts: ,errors=continue EXT4-fs error (device loop3): ext4_fill_super:4448: inode #2: comm syz-executor.3: iget: root inode unallocated EXT4-fs (loop5): mounted filesystem without journal. Opts: ,errors=continue EXT4-fs (loop4): mounted filesystem without journal. Opts: ,errors=continue EXT4-fs (loop3): get root inode failed EXT4-fs (loop3): mount failed EXT4-fs (loop4): mounted filesystem without journal. Opts: ,errors=continue EXT4-fs (loop5): mounted filesystem without journal. Opts: ,errors=continue EXT4-fs error (device loop3): ext4_fill_super:4448: inode #2: comm syz-executor.3: iget: root inode unallocated EXT4-fs (loop4): mounted filesystem without journal. Opts: ,errors=continue EXT4-fs (loop5): mounted filesystem without journal. Opts: ,errors=continue EXT4-fs (loop3): get root inode failed EXT4-fs (loop3): mount failed EXT4-fs (loop5): mounted filesystem without journal. Opts: ,errors=continue EXT4-fs (loop4): mounted filesystem without journal. Opts: ,errors=continue EXT4-fs error (device loop3): ext4_fill_super:4448: inode #2: comm syz-executor.3: iget: root inode unallocated EXT4-fs (loop3): get root inode failed EXT4-fs (loop3): mount failed EXT4-fs (loop5): mounted filesystem without journal. Opts: ,errors=continue EXT4-fs (loop4): mounted filesystem without journal. Opts: ,errors=continue EXT4-fs error (device loop3): ext4_fill_super:4448: inode #2: comm syz-executor.3: iget: root inode unallocated EXT4-fs (loop3): get root inode failed EXT4-fs (loop3): mount failed EXT4-fs error (device loop3): ext4_fill_super:4448: inode #2: comm syz-executor.3: iget: root inode unallocated EXT4-fs (loop3): get root inode failed EXT4-fs (loop3): mount failed EXT4-fs (loop5): mounted filesystem without journal. Opts: ,errors=continue EXT4-fs (loop4): mounted filesystem without journal. Opts: ,errors=continue EXT4-fs error (device loop5): ext4_fill_super:4448: inode #2: comm syz-executor.5: iget: root inode unallocated EXT4-fs (loop5): get root inode failed EXT4-fs (loop5): mount failed EXT4-fs error (device loop3): ext4_fill_super:4448: inode #2: comm syz-executor.3: iget: root inode unallocated EXT4-fs (loop4): mounted filesystem without journal. Opts: ,errors=continue EXT4-fs (loop3): get root inode failed EXT4-fs (loop3): mount failed EXT4-fs error (device loop5): ext4_fill_super:4448: inode #2: comm syz-executor.5: iget: root inode unallocated EXT4-fs (loop5): get root inode failed EXT4-fs (loop5): mount failed EXT4-fs (loop4): mounted filesystem without journal. Opts: ,errors=continue EXT4-fs error (device loop5): ext4_fill_super:4448: inode #2: comm syz-executor.5: iget: root inode unallocated EXT4-fs (loop5): get root inode failed EXT4-fs (loop5): mount failed EXT4-fs (loop5): ext4_check_descriptors: Block bitmap for group 0 not in group (block 0)! EXT4-fs (loop4): mounted filesystem without journal. Opts: ,errors=continue EXT4-fs (loop5): group descriptors corrupted! EXT4-fs (loop5): ext4_check_descriptors: Block bitmap for group 0 not in group (block 0)! EXT4-fs (loop5): group descriptors corrupted! EXT4-fs (loop4): mounted filesystem without journal. Opts: ,errors=continue EXT4-fs (loop5): ext4_check_descriptors: Block bitmap for group 0 not in group (block 0)! EXT4-fs (loop5): group descriptors corrupted! EXT4-fs (loop5): ext4_check_descriptors: Block bitmap for group 0 not in group (block 0)! EXT4-fs (loop5): group descriptors corrupted! EXT4-fs (loop3): bad geometry: block count 256 exceeds size of device (11 blocks) EXT4-fs (loop5): ext4_check_descriptors: Block bitmap for group 0 not in group (block 0)! EXT4-fs (loop5): group descriptors corrupted! EXT4-fs (loop3): bad geometry: block count 256 exceeds size of device (11 blocks) EXT4-fs (loop5): ext4_check_descriptors: Block bitmap for group 0 not in group (block 0)! EXT4-fs (loop5): group descriptors corrupted! EXT4-fs (loop3): bad geometry: block count 256 exceeds size of device (11 blocks) EXT4-fs (loop5): ext4_check_descriptors: Block bitmap for group 0 not in group (block 0)! EXT4-fs (loop5): group descriptors corrupted! EXT4-fs (loop4): bad geometry: block count 256 exceeds size of device (11 blocks) EXT4-fs (loop4): bad geometry: block count 256 exceeds size of device (11 blocks) EXT4-fs (loop5): ext4_check_descriptors: Block bitmap for group 0 not in group (block 0)! EXT4-fs (loop5): group descriptors corrupted! EXT4-fs error (device loop3): ext4_fill_super:4448: inode #2: comm syz-executor.3: iget: root inode unallocated EXT4-fs (loop3): get root inode failed EXT4-fs (loop3): mount failed EXT4-fs (loop5): ext4_check_descriptors: Block bitmap for group 0 not in group (block 0)! EXT4-fs (loop5): group descriptors corrupted! EXT4-fs (loop4): bad geometry: block count 256 exceeds size of device (11 blocks) EXT4-fs error (device loop3): ext4_fill_super:4448: inode #2: comm syz-executor.3: iget: root inode unallocated EXT4-fs (loop5): ext4_check_descriptors: Inode table for group 0 not in group (block 0)! EXT4-fs (loop3): get root inode failed EXT4-fs (loop5): group descriptors corrupted! EXT4-fs (loop3): mount failed EXT4-fs (loop5): ext4_check_descriptors: Inode table for group 0 not in group (block 0)! EXT4-fs (loop3): ext4_check_descriptors: Block bitmap for group 0 not in group (block 0)! EXT4-fs (loop5): group descriptors corrupted! EXT4-fs (loop3): group descriptors corrupted! EXT4-fs error (device loop4): ext4_fill_super:4448: inode #2: comm syz-executor.4: iget: root inode unallocated EXT4-fs (loop3): ext4_check_descriptors: Block bitmap for group 0 not in group (block 0)! EXT4-fs (loop4): get root inode failed EXT4-fs (loop5): ext4_check_descriptors: Inode table for group 0 not in group (block 0)! EXT4-fs (loop3): group descriptors corrupted! EXT4-fs (loop4): mount failed EXT4-fs (loop5): group descriptors corrupted! EXT4-fs (loop3): ext4_check_descriptors: Block bitmap for group 0 not in group (block 0)! EXT4-fs (loop3): group descriptors corrupted! EXT4-fs (loop5): ext4_check_descriptors: Inode table for group 0 not in group (block 0)! EXT4-fs error (device loop4): ext4_fill_super:4448: inode #2: comm syz-executor.4: iget: root inode unallocated EXT4-fs (loop5): group descriptors corrupted! EXT4-fs (loop3): ext4_check_descriptors: Block bitmap for group 0 not in group (block 0)! EXT4-fs (loop4): get root inode failed EXT4-fs (loop3): group descriptors corrupted! EXT4-fs (loop4): mount failed EXT4-fs (loop5): ext4_check_descriptors: Inode table for group 0 not in group (block 0)! EXT4-fs (loop5): group descriptors corrupted! EXT4-fs (loop3): ext4_check_descriptors: Block bitmap for group 0 not in group (block 0)! EXT4-fs (loop3): group descriptors corrupted! EXT4-fs error (device loop4): ext4_fill_super:4448: inode #2: comm syz-executor.4: iget: root inode unallocated EXT4-fs (loop4): get root inode failed EXT4-fs (loop4): mount failed EXT4-fs (loop3): ext4_check_descriptors: Block bitmap for group 0 not in group (block 0)! EXT4-fs (loop3): group descriptors corrupted! EXT4-fs (loop5): ext4_check_descriptors: Inode table for group 0 not in group (block 0)! EXT4-fs (loop5): group descriptors corrupted! EXT4-fs (loop3): ext4_check_descriptors: Block bitmap for group 0 not in group (block 0)! EXT4-fs error (device loop4): ext4_fill_super:4448: inode #2: comm syz-executor.4: iget: root inode unallocated EXT4-fs (loop3): group descriptors corrupted! EXT4-fs (loop4): get root inode failed EXT4-fs (loop5): ext4_check_descriptors: Inode table for group 0 not in group (block 0)! EXT4-fs (loop4): mount failed EXT4-fs (loop5): group descriptors corrupted! EXT4-fs (loop3): ext4_check_descriptors: Block bitmap for group 0 not in group (block 0)! EXT4-fs (loop3): group descriptors corrupted! EXT4-fs (loop5): ext4_check_descriptors: Inode table for group 0 not in group (block 0)! EXT4-fs (loop5): group descriptors corrupted! EXT4-fs error (device loop4): ext4_fill_super:4448: inode #2: comm syz-executor.4: iget: root inode unallocated EXT4-fs (loop5): ext4_check_descriptors: Inode table for group 0 not in group (block 0)! EXT4-fs (loop5): group descriptors corrupted! EXT4-fs (loop4): get root inode failed EXT4-fs (loop4): mount failed EXT4-fs (loop3): ext4_check_descriptors: Block bitmap for group 0 not in group (block 0)! EXT4-fs (loop3): group descriptors corrupted! EXT4-fs (loop5): ext4_check_descriptors: Block bitmap for group 0 not in group (block 0)! EXT4-fs (loop3): ext4_check_descriptors: Inode table for group 0 not in group (block 0)! EXT4-fs (loop3): group descriptors corrupted! EXT4-fs error (device loop4): ext4_fill_super:4448: inode #2: comm syz-executor.4: iget: root inode unallocated EXT4-fs (loop5): group descriptors corrupted! EXT4-fs (loop4): get root inode failed EXT4-fs (loop4): mount failed EXT4-fs (loop3): ext4_check_descriptors: Inode table for group 0 not in group (block 0)! EXT4-fs (loop3): group descriptors corrupted! EXT4-fs (loop5): ext4_check_descriptors: Block bitmap for group 0 not in group (block 0)! EXT4-fs (loop5): group descriptors corrupted! EXT4-fs (loop3): ext4_check_descriptors: Inode table for group 0 not in group (block 0)! EXT4-fs error (device loop4): ext4_fill_super:4448: inode #2: comm syz-executor.4: iget: root inode unallocated EXT4-fs (loop3): group descriptors corrupted! EXT4-fs (loop4): get root inode failed EXT4-fs (loop4): mount failed EXT4-fs (loop5): ext4_check_descriptors: Block bitmap for group 0 not in group (block 0)! EXT4-fs (loop5): group descriptors corrupted! EXT4-fs (loop3): ext4_check_descriptors: Inode table for group 0 not in group (block 0)! EXT4-fs (loop3): group descriptors corrupted! EXT4-fs error (device loop4): ext4_fill_super:4448: inode #2: comm syz-executor.4: iget: root inode unallocated EXT4-fs (loop5): VFS: Can't find ext4 filesystem EXT4-fs (loop4): get root inode failed EXT4-fs (loop4): mount failed