RDX: 0000000000000000 RSI: 0000000020000080 RDI: 0000000000000004 RBP: 00007fae447a3ca0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000000000a R13: 00007ffd7ceece0f R14: 00007fae447a49c0 R15: 000000000119bf8c ============================================ WARNING: possible recursive locking detected 4.14.215-syzkaller #0 Not tainted -------------------------------------------- syz-executor.4/24953 is trying to acquire lock: (rtnl_mutex){+.+.}, at: [] hsr_dev_destroy+0x1b/0xb0 net/hsr/hsr_device.c:373 but task is already holding lock: (rtnl_mutex){+.+.}, at: [] rtnl_lock net/core/rtnetlink.c:72 [inline] (rtnl_mutex){+.+.}, at: [] rtnetlink_rcv_msg+0x31d/0xb10 net/core/rtnetlink.c:4311 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(rtnl_mutex); SQUASHFS error: squashfs_read_data failed to read block 0x0 lock(rtnl_mutex); *** DEADLOCK *** May be due to missing lock nesting notation 1 lock held by syz-executor.4/24953: #0: (rtnl_mutex){+.+.}, at: [] rtnl_lock net/core/rtnetlink.c:72 [inline] #0: (rtnl_mutex){+.+.}, at: [] rtnetlink_rcv_msg+0x31d/0xb10 net/core/rtnetlink.c:4311 stack backtrace: CPU: 1 PID: 24953 Comm: syz-executor.4 Not tainted 4.14.215-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 squashfs: SQUASHFS error: unable to read xattr id index table Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x1b2/0x283 lib/dump_stack.c:58 print_deadlock_bug kernel/locking/lockdep.c:1800 [inline] check_deadlock kernel/locking/lockdep.c:1847 [inline] validate_chain kernel/locking/lockdep.c:2448 [inline] __lock_acquire.cold+0x180/0x97c 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 hsr_dev_destroy+0x1b/0xb0 net/hsr/hsr_device.c:373 register_netdevice+0x83c/0xe40 net/core/dev.c:7721 hsr_dev_finalize+0x57b/0x7fe net/hsr/hsr_device.c:492 hsr_newlink+0x259/0x3a0 net/hsr/hsr_netlink.c:78 rtnl_newlink+0xf88/0x1830 net/core/rtnetlink.c:2728 rtnetlink_rcv_msg+0x3be/0xb10 net/core/rtnetlink.c:4316 netlink_rcv_skb+0x125/0x390 net/netlink/af_netlink.c:2433 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: 0033:0x45e219 RSP: 002b:00007fae447a3c68 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 000000000045e219 RDX: 0000000000000000 RSI: 0000000020000080 RDI: 0000000000000004 RBP: 00007fae447a3ca0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000000000a R13: 00007ffd7ceece0f R14: 00007fae447a49c0 R15: 000000000119bf8c SQUASHFS error: squashfs_read_data failed to read block 0x0 squashfs: SQUASHFS error: unable to read xattr id index table squashfs: SQUASHFS error: Major/Minor mismatch, older Squashfs 0.0 filesystems are unsupported squashfs: SQUASHFS error: unable to read xattr id index table squashfs: SQUASHFS error: Major/Minor mismatch, older Squashfs 0.0 filesystems are unsupported